CN103620810B - LITI donor film - Google Patents

Abstract

The present invention provides a laser thermal transfer (LITI) donor film, comprising: a base film, an adhesion promoter layer, a light-to-heat conversion layer, an intermediate layer, and a transfer layer, wherein the light-to-heat conversion layer comprises a resin composition comprising a thermosetting resin and a light-to-heat conversion material, and the intermediate layer comprises an ultraviolet-curable resin and has a surface energy of 35 mN/m or less.

Description

LITI Donor Membrane

technical field

The present invention relates to a laser thermal transfer (LITI) donor film, and more particularly, the present invention relates to a LITI donor film having a laser thermal transfer forming element for LITI method, or a process similar to the LITI method.

Background technique

Recently, in the technical field of display devices, there has been a tendency to provide excellent visibility with a small amount of energy. Since organic light-emitting devices (OLEDs) consume less energy than existing light-emitting mechanisms, the development of display devices using such OLEDs is competitive.

In order to construct a full-color display of such display devices using OLEDs, the choice of the method for patterning colors onto the light-emitting device is important; Different methods have different construction effects. Methods for forming organic layers in OLEDs include a deposition method, an inkjet scheme, a laser thermal transfer (LITI) method, or the like. The laser thermal transfer method is usually used in the LITI method to convert the light emitted by the laser into heat, and then use the converted heat to transfer the transfer layer to the OLED substrate, thereby forming the organic layer in the OLED. The transfer method or the like is described in Korean Patent No. 10-0700828. Advantages of the LITI method include, for example, high pattern resolution, uniform film thickness, ability to construct multiple layers, and scalability to large-sized mother glasses.

In the LITI method, the LITI donor film is the decisive medium for converting light into heat to form patterns on the substrate of the light-emitting device, which includes red pixel areas (R), green pixel areas (G), blue Transfer layer for pixel area (B). In the structure of the LITI donor film, the base film, the light-to-heat conversion layer and the transfer layer are sequentially laminated. The LITI donor film optionally includes an intermediate layer between the light-to-heat conversion layer and the transfer layer to prevent transfer of materials contained in the light-to-heat conversion layer into the transfer layer.

In the case of irradiating laser light onto the LITI donor film through the LITI process, the light energy of the laser light is converted into thermal energy in the light-to-heat conversion layer, so the light-to-heat conversion layer and the intermediate layer undergo volume expansion under the action of heat, resulting in The transfer layer is transferred onto the OLED substrate under the effect of volume expansion.

[Related technical literature]

(Patent Document 1) Korean Patent No. 10-0700828 (March 21, 2007).

Contents of the invention

[technical problem]

The uniform expansion of the volume of the light-to-heat conversion layer can lead to a smooth and uniform surface transferred from the transfer layer, thereby preferably constructing the transfer pattern, and the inventors have completed the present invention accordingly. An object of the present invention is to provide a LITI donor film, which can make the surface transferred by the transfer layer smooth and uniform when the transfer layer is transferred by the LITI method.

Furthermore, by optimizing the pencil hardness of the intermediate layer, the transfer layer can be uniformly formed even for the bent portion in the case where the receptor has a 3D shape, on which the inventors completed the present invention. That is, another object of the present invention is to provide a LITI donor film having an intermediate layer with excellent form following ability.

[Technical solutions]

To achieve the objective, the present invention relates to a laser thermal transfer (LITI) donor film, comprising: a base film, an adhesion promoter layer, a light-to-heat conversion layer, an intermediate layer and a transfer layer, characterized in that the light-to-heat conversion layer and the composition and thickness of the intermediate layer.

Specifically, the inventors have worked hard to solve the following problems: In the case of using a UV-curable resin in the light-to-heat conversion layer, there may be no foaming due to over-curing, or foaming may occur after transfer printing. , the edge opening phenomenon occurs on the surface obtained by transfer, and the edge opening phenomenon means that, in the case of transferring the transfer layer as shown in Fig. 1, the bent portion or the angled edge portion is not transferred completely phenomenon; then, the inventors found that this edge opening phenomenon can be improved by replacing the UV-curable resin with a thermosetting resin. FIG. 1 is a cross-sectional view illustrating the phenomenon of edge openings produced on a transferred surface after transfer, showing a receptor 200 , a transfer layer 300 and edge openings 100 .

However, when a thermosetting resin is used to form the light-to-heat conversion layer, if the light-to-heat conversion material is not uniformly dispersed but partially adhered, the adhered part may be burned due to excessive heat when irradiated with laser light. It is also possible to produce a telegraphic phenomenon, ie the surface morphology of the conversion layer appears directly on the intermediate layer after application of the intermediate layer.

Furthermore, in the case where a pixel-forming layer is applied onto the light-to-heat conversion layer and then transferred, the surface of the transfer layer is not smooth. Therefore, in order to solve the above problems, the coating amount of the light-to-heat conversion layer after drying is controlled at 1 g/m ² to 3.5 g/m ² , the thickness of the intermediate layer is controlled at 1.0 μm to 3.5 μm, and the light used in the light-to-heat conversion layer The content of the heat conversion material is controlled at 20wt% to 40wt%.

In addition, in order to prevent the photothermal conversion material from locally generating excessive heat due to sticking, a first kneading or mixing process, a second grinding process, and a third filtering process are performed to solve the sticking problem. In addition, for optimum grinding, oxidized carbon black can be used, and additives such as aluminum-based dispersants can also be used. The inventors found that after solving the problem of carbon black adhesion, the surface of the transfer layer becomes smoother obviously, and the phenomenon of edge opening does not occur, so the transfer is successfully completed, and the present invention is realized accordingly.

The surface of the transfer layer obtained by transfer becomes obviously smooth, and the edge opening phenomenon does not occur, which is very important for forming a high-resolution display. As mentioned above, with the LITI donor film according to the present invention, if the coating amount of the light-to-heat conversion layer after drying is controlled at 1 g/m ² to 3.5 g/m ² , the thickness of the intermediate layer is controlled at 1.0 μm to 3.5 μm , the content of the photothermal conversion material used in the photothermal conversion layer is controlled at 20wt% to 40wt%, then the surface energy of the photothermal conversion layer is 35mN/m or less, and its surface roughness is 20nm or less. If the surface roughness of the light-to-heat conversion layer is within the above range, the surface of the transfer layer is smooth and uniform.

To achieve the object, the present invention relates to a laser thermal transfer (LITI) donor film comprising: a base film, an adhesion promoter layer, a light-to-heat conversion layer, an intermediate layer and a transfer layer, characterized in that the hardness of the intermediate layer .

Specifically, the inventors have found that if the hardness of the intermediate layer is too high, the conformability decreases, resulting in an edge opening phenomenon, so that transfer cannot be performed at the receptor portion having a bent portion; or, even if In spite of the transfer, the transfer cannot be performed uniformly along the bent portion, thus lowering the resolution of the display.

Studies conducted to address this issue have demonstrated that the surface roughness of the interlayer is an important influencing factor. Therefore, if the pencil hardness of the intermediate layer exceeds H, then the conformability will be reduced, so the edge opening phenomenon is easy to occur; the resolution of the display. Therefore, in order to solve this problem, it is preferable that the pencil hardness of the intermediate layer is H or less. More preferably, the pencil hardness is HB or less.

In a general aspect, a laser thermal transfer (LITI) donor film includes: a base film, an adhesion promoter layer, a light-to-heat conversion layer, an intermediate layer, and a transfer layer, wherein the light-to-heat conversion layer includes a resin combination The resin composition includes a thermosetting resin and a light-to-heat conversion material, the intermediate layer includes a UV-curable resin, a silicon-based resin or a fluorine-based resin, and the surface energy is 35 mN/m or less.

The surface energy of the intermediate layer may be 18mN/m to 35mN/m.

The surface energy of the intermediate layer may be 18mN/m to 25mN/m.

The surface roughness (Ra) of the light-to-heat conversion layer may be 20 nm or less.

In the light-to-heat conversion layer, the thermosetting resin may be a polyurethane-based resin, and the light-to-heat conversion material is carbon black.

The urethane-based resin may be selected from polyester urethane and polycarbonate urethane.

The content of the light-to-heat conversion material may be 20wt% to 40wt%.

The light-to-heat conversion material can be dispersed in a solvent and any one or two or more resins selected from the following substances: polyvinyl chloride, polyvinyl chloride-polyvinyl acetate copolymer and thermosetting polyurethane .

The light-to-heat conversion layer may further include a thermoplastic resin, the content of which is no more than 50wt% of the total composition of the resin.

The coating amount of the light-to-heat conversion layer after drying may be 1 g/m ² to 3.5 g/m ² .

The thickness of the intermediate layer may be 1.0 μm to 3.5 μm.

In another general aspect, a laser thermal transfer (LITI) donor film includes: a base film, an adhesion promoter layer, a light-to-heat conversion layer, an intermediate layer, and a transfer layer, wherein the intermediate layer has a pencil hardness of H or less.

The intermediate layer can be obtained by coating and curing an ultraviolet curable resin composition.

The UV curable resin composition may include at least one UV curable resin selected from the group consisting of urethane acrylate, epoxy acrylate, polyester acrylate, silicon acrylate and initiator agent.

The ultraviolet curable resin composition may further include at least one thermoplastic resin selected from the group consisting of polyurethane resins, acrylate resins, polyester resins, and urethane acrylate copolymers.

The ultraviolet curable resin composition may further include a fluorine-based additive or a silicon-based additive.

[beneficial effect]

With the LITI donor film according to the present invention, the optimum thickness of the intermediate layer is selected according to the surface roughness of the light-to-heat conversion layer, so as to ensure that the intermediate layer has a uniform surface. Thus, after the transfer is performed on the final transfer layer, a uniform transfer surface is obtained, which optimizes the resolution of the display.

In addition, the present invention can provide LITI donor films with excellent conformal ability. Thus, after the transfer is performed on the final transfer layer, a uniform transfer surface with excellent conformability is obtained, which optimizes the resolution of the display.

Description of drawings

Preferred embodiment is described below in conjunction with accompanying drawing, above-mentioned and other objects, features and advantages of the present invention can be understood more clearly by these contents, in accompanying drawing:

FIG. 1 is a cross-sectional view describing an edge opening phenomenon generated on a prior art transfer surface; and

2 is a cross-sectional view illustrating an example of a laminated structure of a laser thermal transfer (LITI) donor film according to the present invention.

[Description of main component symbols]

detailed description

The laser thermal transfer (LITI) donor film of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 2 , what are laminated sequentially from bottom to top are: a base film 10 , an adhesion promoter layer 20 , a light-to-heat conversion layer 30 , an intermediate layer 40 and a transfer layer 50 .

The first aspect of the present invention provides a laser thermal transfer (LITI) donor film, including: a base film 10, an adhesion promoter layer 20, a light-to-heat conversion layer 30, an intermediate layer 40, and a transfer layer 50; and its surface It can be 35mN/m or less, wherein, the light-to-heat conversion layer 30 includes a resin composition, this resin composition includes a thermosetting resin and a light-to-heat conversion material, and the intermediate layer 40 includes an ultraviolet light-curable resin , silicone-based resin or fluorine-based resin.

The second aspect of the present invention provides the described LITI donor film, comprising: base film 10, adhesion promoter layer 20, light-to-heat conversion layer 30, intermediate layer 40 and transfer layer 50, wherein the hardness of the intermediate layer is H or smaller.

The configuration of each layer in the LITI donor film of the present invention will be described in detail below.

basement membrane

The base film in the present invention may be glass, transparent film or polymer film. An example of the polymer film may include, but not limited to, polyester, polycarbonate, polyolefin, polyethylene resin, or the like. More specifically, polyethylene terephthalate, polyethylene naphthalate, or the like is preferably used because of their high processability, thermal stability, and transparency. More preferably, a material having a light transmittance of 90% or more may be used so as to increase the transmittance of light irradiated during the LITI method execution.

Adhesion, surface tension, or similar properties can be modified by surface modification of the base film by surface treatment techniques known to those skilled in the art, such as corona, plasma, or the like, during subsequent processes. control.

Furthermore, in the base film of the present invention, particles adhered inside and outside and particles having various components such as gel component or base component preferably have a size of 1 μm or less. If the size is larger than 1 μm, the laser light will scatter or diffract under the action of these particles or gel components during the transfer process using the laser, causing the energy of the laser light to not be transmitted to the intended part, so the transfer failure occurs. achievable phenomena.

The thickness of the base film is between 0.025mm and 0.15mm, especially between 0.05mm and 0.1mm, but not limited thereto.

Adhesion promoter layer

The adhesion promoter layer of the present invention controls the transfer of temperature between the base film and its adjacent layers, improves the adhesion between the base film and its adjacent layers, and controls the transfer of radiation used to form an image on the light-to-heat conversion layer. Take control. In the case where the adhesion promoter layer is formed, the phenomenon that the substrate and the light-to-heat conversion layer are separated from each other can be improved during the transfer process using a laser, and thus it is a preferable method. A material suitable for the adhesion promoter layer may be any one selected from acrylic resins, polyurethane-based resins, and polyester-based resins, or a mixed resin of these. When the heat-resistant adhesion between the adhesion promoter layer and the base film is weak, or the heat-resistant adhesion between the adhesion promoter layer and the light-to-heat conversion layer is weak, during the transfer process using a laser, The base film and the light-to-heat conversion layer may be separated from each other.

Specifically, the adhesion promoter layer of the present invention is obtained by coating one surface or both surfaces of the base film through a simultaneous coating process while forming the base film.

That is, if the base film used in the present invention is a polyethylene terephthalate film, it is possible to coat a water-dispersed primer coating solution on the base film and then perform a single step in the process of stretching the film. or biaxially stretched to form the adhesion promoter layer.

Which water-dispersed primer coating liquid is used is not limited as long as it can be used in the corresponding technical field. A preferable water-dispersed primer coating liquid uses a resin having a smaller refractive index difference from that of a polyethylene terephthalate film as a base film, since this improves light transmittance. A preferable example of the water-dispersed primer coating liquid may include: acryl-based resins, polyurethane-based resins, polyester-based resins, or the like.

The thickness of the adhesion promoter layer may preferably range from 0.01 μm to 0.5 μm, but is not limited thereto.

Light-to-heat conversion layer; LTHC layer

The light-to-heat conversion layer of the present invention absorbs light in the infrared-visible region to convert a part of the light into heat, and includes a resin composition including a thermosetting resin and a light-to-heat conversion material.

The resin composition of the present invention may consist of only a thermosetting resin, or may be a mixed resin composed of a thermosetting resin and a thermoplastic resin. In the case of using a hybrid resin composed of a thermosetting resin and a thermoplastic resin, the thermosetting resin may account for 50% or more by weight of the total resin composition including the curing agent. If the content of the thermosetting resin is lower than 50wt%, the anti-solvent property is reduced, so that when the intermediate layer is coated, the solvent of the intermediate layer may penetrate into the light-to-heat conversion layer, so that the light-to-heat conversion material cannot be dispersed during its dispersion process. Disperses smoothly so that pinholes may occur during coating.

Preferably, the thermosetting resin in the resin composition includes a polyurethane-based thermosetting resin. Specific examples of thermosetting polyurethanes may include polycarbonate polyurethanes, polyester polyurethanes, polyurethanes, or the like. Preferably, the glass transition temperature (Tg) of the polyurethane resin is 10°C or higher, more specifically, the Tg is 10°C to 50°C. When the glass transition temperature is lower than the above range, the coating layer may be partially transferred to the opposite surface during the aging process after coating the light-to-heat conversion layer. When the glass transition temperature is higher than the above range, volume expansion decreases upon laser irradiation, making it difficult to transfer into a desired shape.

Examples of curing agents include isocyanate-based curing agents, hydrogen peroxide, epoxy resin-based cross-linking agents, metal chelate-based cross-linking agents, melamine-based cross-linking agents, aziridine-based cross-linking agents, metal salts, or the like . One of these crosslinking agents may be used alone, or a combination of two of them may be used. In addition, thermoplastic resins may be added to this composition.

In terms of solid content, the amount of thermoplastic resin used is less than the total amount of solid content of thermosetting resin and crosslinking agent. Specifically, the thermoplastic resin is used in an amount of less than 50 wt% of the total resin composition. Thermoplastic resin can use polyvinyl chloride vinyl acetate copolymer, polyvinyl chloride homopolymer, polymethyl methacrylate, isobutyl methacrylate, polybutyl methacrylate, polymethyl acrylate-butyl acrylate copolymer substances or similar substances. Preferably, its glass transition temperature is 40°C or above. When the glass transition temperature is lower than 40°C, block phenomenon may occur.

A photothermal conversion material is a material that absorbs incident laser light and converts it into heat. Examples of photothermal conversion materials may include: dyes such as visible light dyes, ultraviolet light dyes, infrared dyes, fluorescent dyes, and radiation polarizing dyes or the like; pigments; metals; metal compounds; metal films; carbon black; metal oxides; metal Sulfide or the like, more preferably carbon black.

In addition to carbon black, dyes such as visible light dyes, ultraviolet light dyes, infrared dyes, fluorescent dyes, radiation polarizing dyes or similar dyes; pigments; organic dyes; inorganic dyes; metals; metal compounds can be further added thereto if necessary; Metallic films; ferric cyanide pigments; cyanide pigments; cyanine dyes; cyanine pigments; cyanine dyes; metal disulfide pigments; metal disulfide dyes; and other light-absorbing materials; or similar substances.

Preferably, the carbon black has an average particle diameter of 10 nm to 30 nm in order to obtain a smooth surface. In addition, carbon black is first dispersed in any one, or two or more resins selected from the following: polyvinyl chloride, polyvinyl chloride-polyvinyl acetate copolymer, and thermosetting polyurethane, thereby performing Surface treatment to significantly improve the dispersibility of the resin.

The method of performing the first dispersion is as follows: carbon black is added to a resin such as polyvinyl chloride, and then kneading, mixing, etc., or the like is performed. The way to perform kneading is to add a solvent and knead using a kneading machine after preparing a preparation liquid with a solid content of 30 wt % to 70 wt %, if the solid content is less than 30 wt %, the viscosity is reduced to cause a decrease in the degree of dispersion of carbon; if the solid If the content is greater than 70wt%, the torque will be too large, which will affect the dispersion effect. It is also possible to further perform an additional milling process and a filtering process on the crude liquid obtained by kneading in order to optimize the degree of dispersion. Preferably, as for the solvent used in the kneading, a solvent type capable of dissolving the resin can be selected according to different resin types, more specifically, a mixed solvent obtained by mixing toluene, methyl ethyl ketone and cyclohexane The ketones are obtained by mixing in a weight ratio of 1-5:1-5:1-5.

In the present invention, the content of the light-to-heat conversion material is preferably in the range of 20wt% to 40wt%. If the content of the light-to-heat conversion material is less than 20 wt %, the transfer process using a laser is limited in the problem of expanding the light-to-heat conversion layer, resulting in that a desired pattern cannot be uniformly transferred. If the content of the light-to-heat conversion material is higher than 40wt%, excessive heat will be generated during the laser transfer printing process, which will burn the light-to-heat conversion layer, making the transfer impossible.

The light-to-heat conversion layer in the present invention can be formed by kneading process, grinding process, filtering process and coating process, and can also be formed by using grinding process, filtering process and coating process. The kneading process and grinding process can optimize the dispersion of particles. Various methods can be used for performing the grinding step, for example, ring grinding, sand grinding, and the like.

The milling process can take various forms. If the ring milling method is used, fill the main tank of the mill with the crude liquid obtained by adding the remaining resin and solvent to the crude liquid obtained by the first kneading (as a result, the solid content of the total liquid is 10wt% to 20wt%) , or, inject the resin/carbon black/solvent mixture liquid (solid content is 10wt% to 20wt%) into the main container of the grinder, and then fill the 0.5mm to 2.0mm zirconium particles at a volume ratio of 50% to 80% ring, and then stir. Stirring can be performed twice. Perform one agitation to circulate the solution in the main grinding vessel into the annulus; perform another agitation to disperse the particles into the annulus. The grains filled into the annular portion may also be other abrasive grains than zirconium grains. Grinding can be performed in various stages as desired. After the first grinding with 2.0mm zirconium particles, the second grinding with 1.5mm particles, and the third grinding with 0.5mm particles to evenly disperse the carbon black particles .

Alternatively, grinding may be performed sequentially by sequentially filling the grinder with particles according to the corresponding size.

When milling, the solids content is preferably in the range of 10 wt% to 20 wt%. However, there are some differences depending on the composition ratio of the resin. When the content is lower than 10wt%, the particle dispersion efficiency may be reduced; when the content is higher than 20wt%, the liquid stability of the solution obtained by grinding may be reduced.

The filtration process can remove large particles with a particle size of 2.5 μm or more. Examples of coating processes may include blade coating processes, extrusion coating processes, and roll coating processes. Different coating methods can be used as required. If additional crosslinking needs to be performed independently after the coating process, the degree of crosslinking can be controlled by a separate aging process.

The light-to-heat conversion layer is formed by coating and drying the substrate including the adhesion promoter layer. Because this is a thermoset type layer, it needs to be cross-linked in an appropriate heat treatment. The cross-linking treatment may be performed through the drying process at the temperature of the drying process, or may be performed independently after the drying process.

Preferably, after the drying process, the coating amount of the light-to-heat conversion layer reaches 1 g/㎡ to 3.5 g/㎡. If the coating amount of the light-to-heat conversion layer after drying is less than 1g/㎡, the light-to-heat conversion layer may be burned during the transfer process; if the coating amount after drying is more than 3.5g/㎡, the transfer of heat is improper, This results in insufficient execution of the transfer.

In addition, preferably, the surface roughness (Ra) of the light-to-heat conversion layer is 20 nm or less, more preferably, in the range of 10 nm to 20 nm. If the surface roughness of this layer is greater than 20 nm, the surface of the transfer layer may not be smooth or uniform.

middle layer

The purpose of the intermediate layer in the present invention is to transfer the light-to-heat conversion material in the light-to-heat conversion layer together when the transfer layer is printed by the heat generated by the light-to-heat conversion layer; The heat is transferred to the transfer layer, so that the light-to-heat conversion layer is burned due to heat.

Preferably, an ultraviolet curable resin can be used as the intermediate layer of the present invention. In order to improve conformability, a thermoplastic resin that is non-tacky at room temperature can be mixed into the intermediate layer for use.

In addition, since the intermediate layer needs to realize the release function of separating the transfer layer from it, it is preferable to add therein a low surface energy fluorine-based resin or silicon-based resin so that the surface energy of the intermediate layer is 35 mN/m or less , more specifically, 18 mN/m to 35 mN/m, preferably 18 mN/m to 25 mN/m. If the surface energy is higher than 35mN/m, the transfer cannot be performed because the intermediate layer cannot perform the release function during the transfer process, so the transfer layer cannot be separated from it. Therefore, as the surface energy of the intermediate layer decreases, the adhesive force between the transfer layer and the intermediate layer becomes smaller, so that the transfer process can proceed smoothly. At the same time, as the surface energy of the intermediate layer increases, the adhesive strength between the transfer layer and the intermediate layer increases, making the transfer process unable to proceed smoothly. The desired range for performing the releasing function is 18 mN/m to 35 mN/m, preferably 18 mN/m to 25 mN/m, within which the transfer can be performed smoothly.

Furthermore, in the case where a part of the transfer layer is transferred using a laser, the intermediate layer of the present invention has excellent conformability. In order to implement the above features, the intermediate layer has a pencil hardness of H or less.

In addition, preferably, the coating thickness of the intermediate layer after drying is 1.0 μm to 3.5 μm. If the thickness is less than 1.0 μm, the heat-shielding effect may be reduced to burn the transfer layer, so that a uniform surface shape cannot be obtained, resulting in uneven surface of the transferred layer, which lowers the resolution of the display. If the thickness is greater than 3.5 μm, heat is excessively shielded, resulting in failure to transfer the transfer layer.

More specifically, if the surface roughness of the light-to-heat conversion layer is increased, the thickness of the intermediate layer needs to be increased in order to ensure a uniform surface shape. If the value of the surface roughness (Ra) of the light-to-heat conversion layer is 10nm to 20nm, then the thickness of the intermediate layer is 2.5μm to 3.5μm; if the value of the surface roughness (Ra) of the light-to-heat conversion layer is 5nm to 10nm, Then the thickness of the intermediate layer is 2 μm to 3.5 μm; if the value of the surface roughness (Ra) of the light-to-heat conversion layer is 5 nm or less, the thickness of the intermediate layer is 1 μm to 3 μm.

Urethane acrylate, epoxy acrylate, polyester, acrylate, silicon acrylate, or the like may be used as the ultraviolet curable resin that may be used in the intermediate layer. In order to control the surface roughness at or below 35mN/m, fluorine-containing substituents are grafted into the main chain of the UV-curable resin; or reactive or non-reactive fluorine-based and silicon-based additives can be added. In addition, various additives can be added to the intermediate layer to eliminate static electricity.

In addition, in order to improve the conformability, the UV curable resin can be mixed with thermoplastic resin to reduce the hardness of the UV curable resin. As examples of thermoplastic resins, urethane resins, acrylic resins, polyester resins, and urethane acrylate copolymer resins can be used. Preferably, the thermoplastic resin needs to be compatible with the UV-curable resin, and its glass transition temperature is in the range of 50°C to 110°C. Preferably, the UV curable resin and the thermoplastic resin are mixed in a weight ratio of 70:30 to 99:1. If the content of the thermoplastic resin exceeds 30 wt%, the flexibility of the film is greatly increased resulting in a decrease in the strength of the film, therefore, the transfer layer may be transferred out together during the LITI process.

In addition, in order to reduce the surface energy of the ultraviolet curable resin, fluorine-based additives and silicon-based additives may be further added thereto as needed.

Specific examples of the fluorine-based additive may include fluorine-based compounds having vinyl reactive groups; non-reactive fluorine-based additives; and the like. Examples of silicon-based additives may include polyester-modified polydimethylsiloxane, polyester-modified dimethylpolysiloxane copolymer, dimethylpolysiloxane-based additives, and modified dimethylpolysiloxane silicone-based additives, methylalkylsiloxane-based additives, reactive silicone acrylate additives, or similar substances. Specific examples may include BYK-300, BYK-301, and BYK-302 (BYK, Co., Ltd.), TeramerUSO-100AMTE Co., Ltd.), but not limited thereto, by product name. Preferably, the content of the additive is 1 to 10 parts by weight of the additive to 100 parts by weight of the ultraviolet curable resin.

In addition, 0.1 to 10 parts by weight of an initiator may be added to 100 parts by weight of the ultraviolet curable resin. The initiator used is not limited and may be any photopolymerization initiator, and specific examples thereof may include IRGACURE184 and the like.

The intermediate layer may be formed using a knife coating process, an extrusion coating process, a roll coating process, or the like.

In addition, the intermediate layer may be formed in a two-layer structure, and an aluminum deposition layer may be further formed on the intermediate layer as required.

Transfer layer

The transfer layer is uniformly coated on the intermediate layer by evaporation method, sputtering method, solution coating method or the like. The transfer layer generally comprises at least one layer to be transferred onto the receptor. For example, the material forming the transfer layer can be: organic material, inorganic material or organometallic material, including electroluminescent material or electroactive material, and other materials.

More specifically, examples of these materials include: polyphenylene vinylene, polyparaphenylene, polyfluorene, polydialkylfluorene, polythiophene, poly(9-vinylcarbazole), poly(N-vinylcarbazole-ethylene alcohol) copolymer, triarylamine, polynorbornene, polyaniline, polyarylpolyamine, triphenylamine-polyetherketone, or the like, but not limited thereto.

The transfer layer may further include one or more materials selected from the following substances corresponding to the characteristics of the organic light-emitting device: light-emitting materials, hole-transporting organic materials, and electron-transporting organic materials. A type known in the art; the transfer layer further includes a compound comprising at least one selected from the group consisting of non-luminescent low-molecular materials, non-luminescent charge transfer polymer materials, and curable organic adhesives. Mixture material.

The configuration of the transfer layer may adopt a type commonly used in this technical field without limitation.

In addition, the transfer layer may be a two-layer structure including an aluminum deposition layer to improve release performance.

While the invention has been described using what are considered to be presently practical exemplary embodiments, it is to be understood that the invention is not limited to such disclosed embodiments. On the contrary, the invention is intended to cover various modifications and equivalent arrangements within the spirit and scope of the appended claims.

A method for measuring each physical property will be described below.

1) Surface roughness

A two-dimensional surface roughness measuring instrument (KousakaLab.Surfcorder SE-3300) is used in the measurement of surface roughness. The measurement conditions include: contact radius 1 μm, load force 0.7 mN, critical value 80 μm. Along the direction of the centerline, a part of the standard length of 1.5 mm is selected from the curve of the membrane section. This process is repeated five times and its average is calculated. Set the roughness curve as y=f(x), where the center line is the x-axis, and the vertical direction is the y-axis. At this time, the calculation method of the surface roughness is expressed by the following formula.

Surface roughness (Ra)=(1/L)∫f(x)dx

2) Surface energy

In the measurement of the surface energy, a contact angle meter was used in which pure water and diiodomethane were used to measure the contact angle. Then, the surface energy was derived using the Owens-Wendt method. The above method is repeated 10 times, and then the average value is calculated.

3) Transfer properties

Tris(8-hydroxyquinoline)aluminum (Alq3) is coated on the intermediate layer as a transfer layer with a thickness of The transfer is then performed using a NdYAG laser with a wavelength of 1064nm and an energy range of 100W to 130W.

The resulting transferred appearance after transfer is identical to the part irradiated by the laser; O

The appearance after transfer obtained after transfer is partly the same as the part irradiated by laser; △

The portion irradiated by the laser light did not perform transfer printing; X

4) Block properties

10 prepared samples were overlapped, a load force of 200gf/cm ² was applied, and then baked in an oven at 40°C for 3 days to judge whether a block was generated.

- generated block; X

- Generate partial blocks; △

- no block produced; O

5) Follow-up ability

Tris(8-hydroxyquinoline)aluminum (Alq3) is coated on the intermediate layer as a transfer layer with a thickness of The transfer is then performed using a NdYAG laser with a wavelength of 1064nm and an energy range of 100W to 130W. The transfer width was 10 μm and the receptor depth was 0.2 μm.

After performing the transfer, the receptor shape is clearly shown as the transferred shape; O

After performing a transfer, the receptor shape does not appear as the transferred shape; X

6) Measurement of pencil hardness

A coating layer was formed on a 100 µm PET substrate, dried and UV-cured to have a coating thickness of 5 µm. As mentioned above, JISK5400 method is used for the measurement of pencil hardness.

Example 1

Preparation of composition (A-1) for forming light-to-heat conversion layer

Mix toluene, methyl ethyl ketone and cyclohexanone with a weight ratio of 1:1:1 to obtain a mixed solvent of the three, add 18wt% polyvinyl chloride vinyl acetate copolymer (DowChemicalCo., Ltd., VMCH grade), 43wt% polyurethane resin (LubrizolCo., Ltd., ESTANE5715 grade), 9wt% polyisocyanate (AekyungChemicalCo., Ltd., AK75 grade) and 30wt% carbon black (Degussa, PRINTEXL6 grade), making the solid content 15wt%, so as to prepare the composition for forming the light-to-heat conversion layer.

Here, the preparation of the crude liquid is carried out through a kneading process and a grinding filtration process as described below.

First, during the kneading process, polyvinyl chloride vinyl acetate copolymer was thermally dissolved at 50°C in a mixed solvent obtained by mixing toluene, methyl ethyl ketone, and cyclohexanone at a weight ratio of 1:1:1 to prepare 13wt% Polyvinyl chloride vinyl acetate solution. A predetermined amount of carbon black was charged into the kneader, then the kneader was operated and a small amount of polyvinyl chloride vinyl acetate solution was added thereto, and a kneading step was performed for 1 hour.

After the kneading is completed, the kneaded solution is placed in the main grinding vessel of the ring mill, and the main grinding vessel is 80% filled with 1.2 mm zirconium particles. Add 20wt% polyurethane resin and a mixed resin (toluene: methyl ethyl ketone: The weight ratio of cyclohexanone=1:1:1), so as to prepare a solution with a solid content ratio of 15wt%. After placing the prepared solution, two agitators operate in the grinder to carry out the grinding. One stirrer is used to put the mixed coating solution into the grinder, and its speed is set at 1000rpm; the other stirrer is installed in the ring to disperse the particles, and its speed is set at 2000rpm; these two stirrers operate 6 Hour.

The solution obtained by grinding is filtered using a filter capable of filtering out particles of 2.5 μm or larger. The filtered solution was coated with a #8 mayer bar and dried at 120°C for 30 seconds. Then, if it is confirmed by a microscope that the surface state is free of particles of 2.5 μm or more, the filtration is completed. After filtering, polyisocyanate was put therein as a curing agent, and stirring was performed for 1 hour to prepare a composition for forming a light-to-heat conversion layer.

Preparation of composition (B-1) for forming intermediate layer

Add silicon-based additives (BYK Co., Ltd., BYK-302) to UV-curable urethane acrylate resin (Toyoink Co., Ltd., LiodurasLCH) at 0.2 wt% of the total composition to prepare the intermediate layer. combination.

Preparation of LITI Donor Membrane

A polyethylene terephthalate (PET) film (Kolonindustries, Inc., H11F) was prepared as a base film in which both surfaces were treated with an acrylic primer.

The composition (A-1) used to form the light-to-heat conversion layer is coated on the acrylic adhesion promoter layer of the prepared base film by a micro-gravure coating method, and then dried to form the light-to-heat conversion layer. layer. In this case, the coating amount after drying was 1.5 g/㎡. The aging process was further performed at 50° C. for 3 days.

The prepared composition (B-1) for forming an intermediate layer was coated on the light-to-heat conversion layer using a micro-gravure coater, and then dried to form the intermediate layer. In this case, the coating thickness of this layer was controlled to be 2.0 μm.

The physical properties of the prepared films were measured and the measurement results are shown in Table 1 below.

Example 2

A film was prepared in the same manner as in Example 1, but the difference was that the thickness of the intermediate layer was controlled to be 3.0 μm.

The physical properties of the prepared films were measured and the measurement results are shown in Table 1 below.

Example 3

The same method as in Example 1 was used to prepare the film, but the difference was that the coating amount of the light-to-heat conversion layer after drying was controlled at 2.5 g/m ² .

The physical properties of the prepared films were measured and the measurement results are shown in Table 1 below.

Example 4

The same method as in Example 1 was used to prepare a film, however, the difference was that the composition of the light-to-heat conversion layer was different.

Preparation of composition (A-2) for forming light-to-heat conversion layer

Toluene, methyl ethyl ketone and cyclohexanone are mixed in a weight ratio of 1:1:1 to obtain a mixed solvent of the three, and 16 wt % of polyvinyl chloride vinyl acetate copolymer (DowChemicalCo., Ltd., VMCH grade), 37wt% polyurethane resin (Lubrizol, ESTANE5715 grade), 7wt% polyisocyanate (AekyungChemicalCo., Ltd., AK75 grade) and 40wt% carbon black (Degussa, PRINTEXL6 grade), making the solid content 15wt% , thus preparing a composition for forming a light-to-heat conversion layer.

The physical properties of the prepared films were measured and the measurement results are shown in Table 1 below.

Example 5

The same method as in Example 1 was used to prepare a film, however, the difference was that the composition of the light-to-heat conversion layer was different.

Preparation of composition (A-3) for forming light-to-heat conversion layer

Mix toluene, methyl ethyl ketone and cyclohexanone with a weight ratio of 1:1:1 to obtain a mixed solvent of the three, add 20wt% polyvinyl chloride vinyl acetate copolymer (DowChemicalCo., Ltd., VMCH grade), 46wt% polyurethane resin (Lubrizol, ESTANE5715 grade), 9wt% polyisocyanate (AekyungChemicalCo., Ltd., AK75 grade) and 25wt% carbon black (Degussa, PRINTEXL6 grade), making the solid content 15wt% , thus preparing a composition for forming a light-to-heat conversion layer.

The physical properties of the prepared films were measured and the measurement results are shown in Table 1 below.

Example 6

Films were produced in the same manner as in Example 1, however, the difference was that the composition of the intermediate layer was different.

Preparation of composition (B-2) for forming intermediate layer

For 100 parts by weight of solid content of fluorine-substituted UV-curable urethane acrylate resin (NegamiCo., Ltd., KY11M-45CF), add 3 parts by weight of initiator (CibaCo., Ltd., Irgacure184), to prepare Composition for forming an intermediate layer.

The physical properties of the prepared films were measured and the measurement results are shown in Table 1 below.

Example 7

Films were produced in the same manner as in Example 1, however, the difference was that the composition of the intermediate layer was different.

Preparation of composition (B-3) for forming intermediate layer

For 100 parts by weight of solid content UV-curable urethane acrylate resin (NegamiCo., Ltd., KY11M-45CF), add 3 parts by weight of photoinitiator (CibaCo., Ltd., Irgacure184) and 3 parts by weight of Silicon-based additive (AMTE Co., Ltd., USO-100) to prepare the composition for forming the intermediate layer.

The physical properties of the prepared films were measured and the measurement results are shown in Table 1 below.

Example 8

Films were produced in the same manner as in Example 1, however, the difference was that the composition of the intermediate layer was different.

Preparation of composition (B-4) for forming intermediate layer

For 100 parts by weight of solid content UV-curable urethane acrylate resin (NegamiCo., Ltd., KY11M-45CF), add 3 parts by weight of photoinitiator (CibaCo., Ltd., Irgacure184) and 3 parts by weight of Silicon-based additive (AMTE Co., Ltd., USO-100) to prepare a composition for forming an intermediate layer.

The physical properties of the prepared films were measured and the measurement results are shown in Table 1 below.

Example 9

Films were produced in the same manner as in Example 1, however, the difference was that the composition of the intermediate layer was different.

Preparation of composition (A-4) for forming light-to-heat conversion layer

Mix toluene, methyl ethyl ketone and cyclohexanone with a weight ratio of 1:1:1 to obtain a mixed solvent of the three, add 18wt% polyvinyl chloride vinyl acetate copolymer (DowChemicalCo., Ltd., VMCH grade), 43wt% polyurethane resin (LubrizolCo., Ltd., ESTANE5715 grade), 9wt% polyisocyanate (AekyungChemicalCo., Ltd., AK75 grade) and 30wt% carbon black (Degussa, PRINTEXL6 grade), making the solid The content is 15wt%, so as to prepare the composition for forming the light-to-heat conversion layer.

Here, the preparation of the crude liquid is carried out through a kneading process and a grinding filtration process as described below.

First, during the kneading process, polyvinyl chloride vinyl acetate copolymer was thermally dissolved at 50°C in a mixed solvent obtained by mixing toluene, methyl ethyl ketone, and cyclohexanone at a weight ratio of 1:1:1 to prepare 13wt% solution of polyvinyl chloride vinyl acetate. A predetermined amount of carbon black was charged into the kneader, then the kneader was operated and a small amount of polyvinyl chloride vinyl acetate solution was added thereto, and a kneading step was performed for 1 hour.

After the kneading is completed, the kneaded solution is placed in the main grinding vessel of the ring mill, and the main grinding vessel is 80% filled with 1.2 mm zirconium particles. Add 20wt% polyurethane resin and a mixed resin (toluene: methyl ethyl ketone: The weight ratio of cyclohexanone=1:1:1), so as to prepare a solution with a solid content ratio of 15wt%. After placing the prepared solution, two agitators operate in the grinder to carry out the grinding. One stirrer is used to put the mixed coating solution into the grinder, and its speed is set at 1000rpm; the other stirrer is installed in the ring to disperse the particles, and its speed is set at 2000rpm; these two stirrers operate 6 Hour.

Use a filter to filter the solution obtained by grinding, and the filter can filter out particles of 3.0 μm or more. The filtered solution was coated with a #8 Meyer rod and dried at 120°C for 30 seconds. Then, if it is confirmed by a microscope that the surface state is free of particles of 3.0 μm or more, the filtration is terminated. After filtering, polyisocyanate was put therein as a curing agent, and stirring was performed for 1 hour to prepare a composition for forming a light-to-heat conversion layer.

The physical properties of the prepared films were measured and the measurement results are shown in Table 1 below.

Example 10

The same method as in Example 1 was used to prepare the film, but the difference was that the coating amount of the light-to-heat conversion layer after drying was controlled at 3.5 g/m ² .

The physical properties of the prepared films were measured and the measurement results are shown in Table 1 below.

Example 11

A film was prepared in the same manner as in Example 1, but the difference was that the thickness of the intermediate layer was controlled at 3.5 μm.

Example 12

The same method as in Example 1 was used to prepare a film, but the difference was that the thickness of the intermediate layer was controlled at 4.0 μm.

The physical properties of the prepared films were measured and the measurement results are shown in Table 1 below.

Example 13

A film was prepared in the same manner as in Example 1, but the difference was that the thickness of the intermediate layer was controlled at 0.5 μm.

The physical properties of the prepared films were measured and the measurement results are shown in Table 1 below.

Example 14

The same method as in Example 1 was used to prepare the film, but the difference was that the coating amount of the light-to-heat conversion layer after drying was controlled at 4.0 g/m ² .

The physical properties of the prepared films were measured and the measurement results are shown in Table 1 below.

Example 15

The same method as in Example 1 was used to prepare the film, but the difference was that the coating amount of the light-to-heat conversion layer after drying was controlled at 0.5 g/m ² .

The physical properties of the prepared films were measured and the measurement results are shown in Table 1 below.

Example 16

The same method as in Example 1 was used to prepare a film, however, the difference was that the composition of the light-to-heat conversion layer was different.

Preparation of composition (A-5) for forming light-to-heat conversion layer

Mix toluene, methyl ethyl ketone and cyclohexanone with a weight ratio of 1:1:1 to obtain a mixed solvent of the three, add 43wt% polyvinyl chloride vinyl acetate copolymer (DowChemicalCo., Ltd., VMCH grade), 18wt% polyurethane resin (LubrizolCo., Ltd., ESTANE5715 grade), 9wt% polyisocyanate (AekyungChemicalCo., Ltd., AK75 grade) and 30wt% carbon black (Degussa, PRINTEXL6 grade), making the solid The content is 15wt%, so as to prepare the composition for forming the light-to-heat conversion layer.

The physical properties of the prepared films were measured and the measurement results are shown in Table 1 below.

Example 17

The same method as in Example 1 was used to prepare a film, however, the difference was that the composition of the light-to-heat conversion layer was different.

Preparation of composition (A-6) for forming light-to-heat conversion layer

Mix toluene, methyl ethyl ketone and cyclohexanone with a weight ratio of 1:1:1 to obtain a mixed solvent of the three, add 12wt% polyvinyl chloride vinyl acetate copolymer (DowChemicalCo., Ltd., VMCH grade), 30wt% polyurethane resin (Lubrizol, ESTANE5715 grade), 8wt% polyisocyanate (AekyungChemicalCo., Ltd., AK75 grade) and 50wt% carbon black (Degussa, PRINTEXL6 grade), making the solid content 15wt% , thus preparing a composition for forming a light-to-heat conversion layer.

The physical properties of the prepared films were measured and the measurement results are shown in Table 1 below.

Comparative example 1

Films were prepared in the same manner as in Example 1, except that a non-primed PET film was used.

The physical properties of the prepared films were measured and the measurement results are shown in Table 1 below.

Comparative example 2

The film was prepared by the same method as in Example 1, but the difference was that the compositions of the intermediate layer and the light-to-heat conversion layer were different.

Preparation of composition (A-7) for forming light-to-heat conversion layer

Mix toluene, methyl ethyl ketone and cyclohexanone with a weight ratio of 1:1:1 to obtain a mixed solvent of the three, add 12wt% polyvinyl chloride vinyl acetate copolymer (DowChemicalCo., Ltd., VMCH grade), 30wt% polyurethane resin (Lubrizol, ESTANE5715 grade), 8wt% polyisocyanate (AekyungChemicalCo., Ltd., AK75 grade) and 80wt% carbon black (Degussa, PRINTEXL6 grade), making the solid content 15wt% , thus preparing a composition for forming a light-to-heat conversion layer.

Preparation of composition (B-5) for forming intermediate layer

UV-curable urethane acrylate resin (Toyoink Co., Ltd., Lioduras LCH series) was used for this layer. The resin was first diluted with a methyl ethyl ketone solution to prepare a solution with a solid content of 20 wt%, and then coated.

The physical properties of the prepared films were measured and the measurement results are shown in Table 1 below.

[Table 1]

As shown in Table 1 above, it can be understood that in Examples 1 to 11, the conformability, pencil hardness, transfer properties and block properties are excellent. In these examples, the surface energy is 35mN/m or 35mN/m m or less, the thickness of the intermediate layer is 3.5 μm or less, the coating amount of the light-to-heat conversion layer after drying is 3.5 g/㎡ or less, and the carbon content is 40 wt% or less.

In addition, it can be understood that in Comparative Example 1 without the adhesion promoter layer, the conformability and transfer properties are not good; in Comparative Example 2, the carbon content is high and the surface energy is uncontrollable, so that the conformability and transfer properties The properties are not good, and the block properties are also poor.

Example 18

Preparation of composition (A-8) for forming light-to-heat conversion layer

Mix toluene, methyl ethyl ketone and cyclohexanone with a weight ratio of 1:1:1 to obtain a mixed solvent of the three, add 18wt% polyvinyl chloride vinyl acetate copolymer (DowChemicalCo., Ltd., VMCH grade), 43wt% polyurethane resin (LubrizolCo., Ltd., ESTANE5715 grade), 9wt% polyisocyanate (AekyungChemicalCo., Ltd., AK75 grade) and 30wt% carbon black (Degussa, PRINTEXL6 grade), making the solid The content is 15wt%, so as to prepare the composition for forming the light-to-heat conversion layer.

Here, the preparation of the crude liquid is carried out through a kneading process and a grinding filtration process as described below.

First, during the kneading process, polyvinyl chloride vinyl acetate copolymer was thermally dissolved at 50°C in a mixed solvent obtained by mixing toluene, methyl ethyl ketone, and cyclohexanone at a weight ratio of 1:1:1 to prepare 13wt% Polyvinyl chloride vinyl acetate solution. A predetermined amount of carbon black was charged into the kneader, then the kneader was operated and a small amount of polyvinyl chloride vinyl acetate solution was added thereto, and a kneading step was performed for 1 hour.

After the kneading is completed, the kneaded solution is placed in the main grinding vessel of the ring mill, and the main grinding vessel is 80% filled with 1.2 mm zirconium particles. Add 20wt% polyurethane resin and a mixed resin (toluene: methyl ethyl ketone: The weight ratio of cyclohexanone=1:1:1), so as to prepare a solution with a solid content ratio of 15wt%. After placing the prepared solution, two agitators operate in the grinder to carry out the grinding. One stirrer is used to put the mixed coating solution into the grinder, and its speed is set at 1000rpm; the other stirrer is installed in the ring to disperse the particles, and its speed is set at 2000rpm; these two stirrers operate 6 Hour.

Use a filter to filter the solution obtained by grinding, and the filter can filter out particles of 2.5 μm or more. The filtered solution was coated with a #8 Meyer rod and dried at 120°C for 30 seconds. Then, if it is confirmed by a microscope that the surface state is free of particles of 2.5 μm or more, the filtration is terminated. After filtering, polyisocyanate was put therein as a curing agent, and stirring was performed for 1 hour to prepare a composition for forming a light-to-heat conversion layer.

Preparation of composition (B-6) for forming intermediate layer

In an amount of 3 parts by weight in 100 parts by weight of urethane acrylate solid content, the initiator (BASFC Co., Ltd., IRGACURE184) was added to the UV-curable urethane acrylate resin (NegamiCo., Ltd., KY11), At the same time, according to the amount of 3 parts by weight in the total solid content of urethane acrylate, add reactive silicon acrylate additives (AMTECO., Ltd., TeramerUSO-100, a solution with a solid content of 100%), so as to prepare Composition for forming the middle layer.

Preparation of LITI Donor Membrane

A polyethylene terephthalate (PET) film (Kolonindustries, Inc., H11F) was prepared as a base film in which both surfaces were treated with an acrylic primer.

The composition (A-8) used to form the light-to-heat conversion layer is coated on the acrylic adhesion promoter layer of the prepared base film by micro-gravure coating method, and then dried to form the light-to-heat conversion layer. layer. In this case, the coating thickness of this layer was controlled to be 2.5 μm after drying. The aging process was further performed at 50° C. for 3 days.

The prepared composition (B-6) for forming an intermediate layer was coated on the light-to-heat conversion layer using a micro-gravure coater, and then dried to form the intermediate layer. In this case, the coating thickness of this layer was controlled at 2.5 μm.

The physical properties of the prepared films were measured and the measurement results are shown in Table 2 below.

Example 19

Films were prepared in the same manner as in Example 18, however, the difference was that the composition of the intermediate layer was different.

Preparation of composition (B-7) for forming intermediate layer

A thermosetting urethane acrylate resin (Taisei Co., Ltd., 8UA-146) was combined with a UV-curable urethane acrylate resin (Negami Co., Ltd., KY-11), wherein the ratio of solid content was 30:70. Initiator (BASFC Co., Ltd., IRGACURE184) was added in an amount of 3 parts by weight based on 100 parts by weight of the solid content of urethane acrylate, and at the same time, the reaction was added in an amount of 3 parts by weight based on the total solid content of urethane acrylate A silicone acrylate additive (AMTECO., Ltd., Teramer USO-100, solution with a solid content of 100%) was used to prepare a composition for forming an intermediate layer.

The physical properties of the prepared films were measured and the measurement results are shown in Table 2 below.

Example 20

Films were prepared in the same manner as in Example 18, however, the difference was that the composition of the intermediate layer was different.

Preparation of composition (B-8) for forming intermediate layer

In the amount of 3 parts by weight of 100 parts by weight of urethane acrylate solid content, the initiator (BASFC Co., Ltd., IRGACURE184) was added to the UV-curable urethane acrylate resin (NegamiCo., Ltd., KY11), At the same time, according to the amount of 3 parts by weight of the total solid content of urethane acrylate, add reactive silicon acrylate additives (AMTECO., Ltd., TeramerUSO-100, a solution with a solid content of 100%), so as to prepare Composition for forming the middle layer.

The physical properties of the prepared films were measured and the measurement results are shown in Table 2 below.

Comparative example 3

Films were prepared in the same manner as in Example 18, however, the difference was that the composition of the intermediate layer was different.

Preparation of composition (B-9) for forming intermediate layer

An initiator (BASFC Co., Ltd., IRGACURE184) was added to a UV-curable urethane acrylate resin (Negami Co., Ltd., UN-906) in an amount of 3 parts by weight based on 100 parts by weight of urethane acrylate solid content At the same time, according to the amount of 3 parts by weight of the total solid content of urethane acrylate, add reactive silicone acrylate additives (AMTECO., Ltd., TeramerUSO-100, a solution with a solid content of 100%), so that A composition for forming an intermediate layer is prepared.

The physical properties of the prepared films were measured and the measurement results are shown in Table 2 below.

Comparative example 4

Films were prepared in the same manner as in Example 18, however, the difference was that the composition of the intermediate layer was different.

Preparation of composition (B-10) for forming intermediate layer

An initiator (BASFC Co., Ltd., IRGACURE184) was added to a UV-curable urethane acrylate resin (Negami Co., Ltd., UN-908) in an amount of 3 parts by weight based on 100 parts by weight of the solid content of the urethane acrylate At the same time, according to the amount of 3 parts by weight of the total solid content of urethane acrylate, add reactive silicone acrylate additives (AMTECO., Ltd., TeramerUSO-100, a solution with a solid content of 100%), so that A composition for forming an intermediate layer is prepared.

The physical properties of the prepared films were measured and the measurement results are shown in Table 2 below.

[Table 2]

As shown in the above table, it can be understood that in the LITI donor film of the present invention, the pencil hardness of the intermediate layer is H or less, so that when laser transfer is applied to the LITI donor film, the LITI donor film will be Has excellent coating appearance and excellent transfer properties.

However, it can be understood that in Comparative Examples 3 and 4, the pencil hardness of the intermediate layer is high, so the conformability is not good.

Therefore, it can be understood that the pencil hardness of the intermediate layer affects the conformability, and preferably, when the pencil hardness thereof is in the range of 1H or lower, the conformability is excellent.

Claims (11)

1. LASER HEAT transcription (LITI) donor film, comprising: basement membrane, adhesion promoter layer, photothermal transformation layer, intermediate layer and transfer printing layer,

Wherein said photothermal transformation layer comprises resin combination, and this resin combination comprises thermosetting resin and optical-thermal conversion material, and described intermediate layer comprises UV-cured resin and surface energy is 35mN/m or is less than 35mN/m,

The surface roughness (Ra) of wherein said photothermal transformation layer is for 20nm or be less than 20nm, and the thickness in described intermediate layer is 1.0 μm to 3.5 μm, and the pencil hardness in described intermediate layer is H or less, and this hardness adopts JISK5400 to record.

2. LITI donor film according to claim 1, the surface energy in wherein said intermediate layer is 18mN/m to 35mN/m.

3. LITI donor film according to claim 2, the surface energy in wherein said intermediate layer is 18mN/m to 25mN/m.

4. LITI donor film according to claim 1, wherein in described photothermal transformation layer, described thermosetting resin is polyurethane based resin, and described optical-thermal conversion material is carbon black.

5. LITI donor film according to claim 4, wherein said polyurethane based resin is selected from PAUR and polycarbonate polyurethane.

6. LITI donor film according to claim 1, the content of wherein said optical-thermal conversion material is 20wt% to 40wt%.

7. LITI donor film according to claim 1, wherein said optical-thermal conversion material is dispersed in a kind of solvent and any one or two or more the resin selected from following material: polyvinyl chloride, polyvinyl chloride-polyvinyl acetate copolymer and heat-curable urethane.

8. LITI donor film according to claim 1, wherein said photothermal transformation layer comprises thermoplastic further, and its content is no more than the 50wt% of total resin composition.

9. LITI donor film according to claim 1, wherein said photothermal transformation layer coating weight is after the drying 1g/ ㎡ to 3.5g/ ㎡.

10. LITI donor film according to claim 1, the UV-cured resin in wherein said intermediate layer is the UV-cured resin that fluorine replaces.

11. LITI donor film according to claim 1, wherein said intermediate layer comprises silicone or fluoro resin further.