KR102013169B1 - Biaxially stretched polypropylene deco sheet film and method for manufacturing veneer using the same - Google Patents

Abstract

Disclosed are a biaxially stretched polypropylene decor sheet film for use in furniture and building materials, and a method of manufacturing veneer using the same. The heat-adhesive protective film 200 and the lower portion of the protective film 200 is formed, and is formed on the center layer 60, the upper layer of the center layer 60 to serve as a support layer to maintain the film form, Propylene homopolymer, propylene with at least one α-olefin copolymer (propylene content: 50-99 wt%), polyethylene or ethylene and at least one α-olefin copolymer (ethylene content: 30-95 wt%) or ethylene Vinyl acetate (VA) copolymer (vinyl acetate content of 3 to 40% by weight) and a mixture of the upper surface layer 40 selected from the group consisting of a printed layer 30 printed on the upper surface of the upper surface layer 40 It provides a polypropylene decor sheet film comprising a base film 300 comprising a).

Description

Biaxially stretched polypropylene deco sheet film and method for manufacturing veneer using the same}

The present invention relates to a biaxially stretched polypropylene deco sheet film having excellent processability when deco sheet film filing, and a method of manufacturing veneer using the same. More specifically, the processability of a deco film used in furniture and building materials is improved. The present invention relates to a biaxially oriented polypropylene deco sheet film having excellent processability, which can be produced even in a PVC decor sheet production facility by reducing the number of processing processes compared to a sheet, and a method of manufacturing veneer using the same.

When decorative film is used on the exterior of furniture, the protection of the printing surface is important. However, even if the printing performance is increased as much as possible, the printing surface may be peeled off by the impact of the surface, and there is a concern that the scratch may be generated by the impact during processing and loading. There is such a problem, by attaching a transparent film on the top of the printed polypropylene decorative sheet film, it gives a role of preventing damage to the printing surface by the impact.

The polypropylene protective film is environmentally friendly because it does not discharge additional harmful substances, but the barrier performance of water is relatively superior to other materials, but when used for adhesion, the surface resistance is low, There was a difficult problem. In order to solve such an adhesion problem, conventionally, a surface was modified by applying a primer to an adhesive surface of a polypropylene film, and then bonded to a printing film using an adhesive. Such a method is disclosed in Korean Patent No. 10-0804826 B1 for an olefin resin composition for decor sheet and a decor sheet using the same, and Korean Patent No. 10-0622894 B1 mixes a modified polyethylene resin and a polyurethane resin. Thus, a method of adhering a printing film and a protective film through thermal lamination is disclosed. In addition, the Republic of Korea Patent Publication No. 10-2014-0007639 discloses a method for bonding through hot pressing after the urethane adhesive is applied when the protective film and the printing film is bonded.

However, according to the above-described pretreatment method of polypropylene decor sheet film and its bonding method, it is not limited to using the protective film made of polypropylene material, and the adhesion, strength and durability are low to protect to increase the adhesion to the adhesive surface. There is a need for a pretreatment process that applies a primer to the back of the film. For adhesion between the pretreated protective film and the printed polypropylene decor sheet film, a separate adhesive application process or a separate polyurethane resin or a pre-application process of a polyurethane mixed adhesive was essential. In order to bond between the protective film and the printing film in more detail, by applying a primer on the protective film in the conventional method to give a constant surface adhesion, and a polyurethane and a mixed adhesive or a separate adhesive on the protective film coated with the primer Was applied to the film to adhere the printed polypropylene decor sheet to prepare a veneer. When the veneer is manufactured by the conventional method, a separate film pretreatment process is consumed, and when the protective film and the print film are adhered, there is a problem that a separate adhesive application process, hot pressing, and a volatilization process of a solvent type adhesive are involved.

In addition, in Korean Patent No. 10-2011-0075774, in order to protect a printed layer printed on paper, a polyolefin resin is coextruded in a stretched coextruded film having multiple adhesive layers, and then ethylene vinyl acetate resin (EVA) is formed on the polyolefin resin layer. The present invention discloses a film that can be replaced by a thermal lamination method of laminating a laminate to bond an adhesive object. The stretched coextruded film having such a multi-adhesive layer has excellent adhesive strength with paper, but has a problem in that adhesion is not performed only by heat adhesion with a printing decor sheet film made of polypropylene.

Accordingly, an object of the present invention is to provide a biaxially stretched polypropylene decor sheet film which can be laminated by only hot pressing the protective film and the printed base film without a surface treatment such as a primer.

Another object of the present invention is to provide a veneer using a biaxially stretched polypropylene decor sheet film which is economical and has improved productivity.

In order to achieve the above object, the present invention is formed in the lower portion of the protective film 200 and the heat-adhesive film 200, the center layer 60, which serves as a support layer for maintaining the film form, the center layer Formed on top of (60), a propylene homopolymer, propylene and at least one α-olefin copolymer (propylene content: 50 to 99% by weight), polyethylene or ethylene and at least one α-olefin copolymer (ethylene content: 30 to 95% by weight) or an upper surface layer 40 and an upper portion of the upper surface layer 40 selected from the group consisting of ethylene and vinyl acetate (VA) copolymers (vinyl acetate content 3 to 40% by weight) and mixtures thereof Provided is a polypropylene decor sheet film comprising a base film 300 including a printed layer 30 on which a pattern is printed.

In addition, the present invention is a step of manufacturing a heat-adhesive protective film 200, is formed on the lower portion of the protective film 200, the center layer 60, which serves as a support layer to maintain the film form, the center layer 60 Propylene homopolymer, propylene and at least one α-olefin copolymer (propylene content: 50 to 99% by weight), polyethylene or ethylene and at least one α-olefin copolymer (ethylene content: 30 to 95 wt%) or an upper surface layer 40 selected from the group consisting of ethylene and vinyl acetate (VA) copolymer (vinyl acetate content 3 to 40 wt%) and mixtures thereof and a pattern on top of the upper surface layer 40 The co-extrusion of the composition of the base film 300 including the printed printing layer 30 in the form of a sheet to produce a base film 300, the upper surface layer 40 of the base film 300 by a printing press By printing a pattern Manufacturing a printed layer 30, heat-pressing the base film 200 and the protective film 200 including the printed layer 30 to produce a biaxially stretched polypropylene decor sheet film including the protective film 200. Step, laminating the adhesive layer 90 under the lower surface layer 80 of the polypropylene decor sheet film including the protective film and the biaxially stretched polypropylene decor sheet film and the plywood 100 laminated the adhesive layer 90 It provides a veneer manufacturing method comprising the step of heat pressing.

The biaxially stretched polypropylene decor sheet film according to the present invention simplifies the process by omitting conventional manufacturing processes such as primer coating process, adhesive coating process, solvent volatilization process, and manufactures veneer by heat pressing (hot pressing), It is possible to produce veneers using biaxially stretched polypropylene decor sheet films which are economical and have improved productivity.

1 is a cross-sectional view of a biaxially stretched polypropylene decor sheet film including a protective film for protecting a printed layer according to an embodiment of the present invention.
Figure 2 is an adhesive cross-sectional view of the biaxially stretched polypropylene decorative sheet film and plywood containing a protective film according to another embodiment of the present invention.

In describing the present invention, the size or shape of the components shown in the drawings may be exaggerated or simplified for clarity and convenience of description. In addition, terms that are specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator. These terms should be interpreted as meanings and concepts corresponding to the technical spirit of the present invention based on the contents throughout the specification.

Hereinafter, with reference to the accompanying drawings will be described in more detail the present invention.

1 is a view showing a cross-sectional structure of a biaxially stretched polypropylene decor sheet film including a protective film 200 for protecting a printing film according to an embodiment of the present invention. As shown in FIG. 1, the biaxially stretched polypropylene decor sheet film according to an embodiment of the present invention includes a protective film 200 capable of thermal lamination and a base film 300 positioned below the protective film 200. It includes, the protective film 200 and the base film 300 may be hot pressed to form a propylene decor sheet film.

The protective film 200 further includes an adhesive layer 20 for adhering the protective layer 10 and the printing film 30. The base film 300 is composed of a print layer 30, an upper surface layer 40, a center layer 60, and further includes a lower surface layer 80, the upper and lower surface layers 40, 80 and the center layer Intermediate layers (50, 70) between the 60 can be formed, and may further include a print film 30 on the upper surface layer 40, it may be made of a three-layer or five-layer or multi-layer structure.

The protective film 200 is located on one surface of the upper surface layer 40 and is a film for protecting the printed layer 30 printed on the biaxially stretched polypropylene decor sheet film. The protective film 200 is an adhesive layer composed of a solvent-free adhesive consisting of a protective layer 10 including a polypropylene layer and a polyethylene layer and an ethylene vinyl acetate resin (EVA) alone or a mixture of ethylene vinyl acetate resin (EVA) and other mixtures ( 20). The protective layer 10 is a film made by co-extrusion of polyethylene on one surface of a general BOPP film composed of polypropylene to form a protective layer (10). The adhesive layer 20 is formed by laminating the ethylene vinyl acetate resin (EVA) on the lower portion of the polyethylene layer of the protective layer 10 and hot-bonded with the printing layer 30 of the biaxially stretched polypropylene decor sheet film. On the opposite side of the co-extruded polyethylene of the protective layer 10 may be made of a propylene resin, ethylene resin or a resin selected from the group consisting of propylene and ethylene polymer (ethylene content of 5 to 70% by weight) and mixtures thereof. Specifically, the polypropylene layer is selected from the group consisting of propylene resin, ethylene resin or propylene and ethylene polymer (ethylene content 5 to 70% by weight) and mixtures thereof, the polyethylene layer is one or more of ethylene resin, ethylene α-olefin copolymer (ethylene content: 30 to 95% by weight), ethylene and vinyl acetate copolymer, ethylene and vinyl alcohol copolymer, ethylene and vinyl acetate extract copolymer and mixtures thereof Can be.

The protective layer 10 is conventionally made of only polypropylene resin. Therefore, the adhesion between the protective layer 10 and the printing layer 30 is reduced, there was a problem that peeled off with the printing layer 30 of the biaxially stretched polypropylene decor sheet film. Conventionally, in order to solve this problem, the primer is applied to the lower portion of the protective layer 10 to improve the surface adhesion, and a separate adhesive 20 is applied to the printing layer 30 of the biaxially stretched polypropylene decor sheet film. However, in general, primers are used by diluting solids with adhesive strength to organic solvents, so that the human body may be exposed to organic solvents when applying primers, and the film is impregnated with organic solvents even after lamination, so that the finished decorative sheet is treated with primers. The organic solvent component used in the process remains.

In order to solve this problem, the present invention produces a BOPP film 10 by co-extrusion of an existing polypropylene resin with ethylene resin, and manufactures a protective film 200 by laminating ethylene vinyl acetate resin with an adhesive layer 20. Through this, in the past, the adhesion between the print layer and the BOPP film had to be low, and thus a separate pretreatment operation was required, but the protective film 200 may be adhered onto the print film 30 only through hot pressing. Therefore, the steps of the conventional primer coating process, adhesive coating process, and adhesive solvent volatilization process may be omitted, and the printing layer 30 of the protective film and the biaxially stretched polypropylene decor sheet film may be formed by only hot pressing with the protective film 200. Adhesion was possible, and the workability was remarkably improved.

The adhesive layer 20 is positioned below the protective film 200 and is a layer bonded to the printing layer 30 of the biaxially stretched polypropylene decor sheet. In more detail, the protective film 200 may be laminated by laminating ethylene vinyl acetate resin with the printing layer 30 of the biaxially stretched polypropylene decor sheet film by heat bonding (hot adhesion), and also using a solvent-free adhesive (Hot). By laminating the -melt Lami, 20, the veneer which protected the pattern of the printing layer 30 by heat-bonding (hot adhesion) with the printing layer 30 of the biaxially stretched polypropylene decor sheet film can be manufactured. The adhesive layer is a solvent-free adhesive consisting of ethylene vinyl acetate resin (EVA) alone or a mixture of ethylene vinyl acetate resin (EVA) and other mixtures, and can be used in addition to the solvent-free adhesive, conventional solvent-type adhesive. For example, vinyl acetate type (PVA), latex type, acryl type, EVA type or the like can be used. The adhesive is 0.1 µm to 5 µm, preferably 1 µm to 2 µm. If the adhesive is too small, there is a problem of delamination, if too much, there is a problem that the adhesive is released to the side by pressing. It is possible to obtain a protective film 200 characterized by such a process and configuration.

The print layer 30 is formed by stacking a film on which the pattern is printed or printed on the upper surface layer 40 through a printing machine. In order to increase the interlayer adhesion of the biaxially stretched polypropylene decor sheet film including the print layer 30, a separate ethylene vinyl acetate resin (EVA) may be laminated (laminated). A pattern is printed on the manufactured print layer 30, and the biaxially stretched polypropylene decor sheet film including the print layer 30 may be adhered to the protective film 200 only by heat pressing (hot pressing). The printing layer 30 is a printing film capable of thermal lamination, and the material of the upper surface layer 40 may be selected in consideration of the surface and printability of the polyolefin resins in consideration of printability characteristics.

The upper surface layer 40 is located between the print layer 30 and the center layer 60 as one surface of the center layer 60, and is exposed to the outside during the production of the base film, printability, depending on the purpose It may have characteristics such as smoothness and wear resistance. The composition of the upper surface layer 40 is a propylene homopolymer, propylene and at least one α-olefin copolymer (propylene content: 50 to 99% by weight), polyethylene or ethylene and at least one α-olefin copolymer (ethylene content : 30 to 95% by weight) or ethylene vinyl acetate resin (EVA) (vinyl acetate content of 3 to 40% by weight) and mixtures thereof. Preferably consisting of polyethylene, ethylene and at least one α-olefin copolymer (ethylene content: 5 to 70% by weight) or ethylene vinyl acetate resin (EVA) (vinyl acetate content: 3 to 40% by weight) and mixtures thereof It may include a resin selected from the group. The α-olefin may be ethylene, propylene, 1-butane, 1-pentene, 1-hexene, 1-methyl-1-pentene, 1-octene, 1-decene, mixtures thereof, and the like. Ethylene, propylene, 1-butene, 1-hexene, 1-methyl-1-pentene, 1-octene and the like can be used. The biaxially stretched polypropylene decor sheet film is a stretched coextrusion film in which the upper surface layer 40 is heat-bonded, and particularly, a protective film having an ethylene vinyl acetate resin (EVA) layer having excellent adhesive strength with the ethylene vinyl acetate resin (EVA) layer. Excellent adhesion in thermal and thermal lamination processes. The melting point peak temperature of the upper surface layer 40 composition is 70 to 135 ℃, the melt index (ASTM D 1238, 190, 2.16Kg) is 0.5 to 20.0.

The lower surface layer 80 is a layer that improves surface adhesion to the other surface of the center layer 60. The composition of the lower surface layer 80 is a resin or a mixture of polypropylene resin and polyethylene resin selected from the group consisting of propylene homopolymer, propylene-α-olefin copolymer (propylene content: 50 to 99% by weight) and mixtures thereof It may be made of a MATTE compound consisting of. The α-olefins may include ethylene, 1-butene, 1-pentene, 1-hexene, 1-methyl-1-pentene, 1-octene, 1-decene, mixtures thereof, and the like, preferably ethylene, 1-butene, 1-hexene, 1-methyl-1-pentene, 1-octene and the like can be used. A primer may be applied to the lower surface of the lower surface layer 80, and the decorative sheet may be fixed to the plywood by applying a solvent-type adhesive on the top of the plywood when the veneer is manufactured.

The upper and lower surface layers 40 and 80, or both surface layers, may be selected from antioxidants, UV stabilizers, UV absorbers, antistatic agents, lubricants, antiblocking agents, fillers, antifog agents, plasticizers, compatibilizers and Additives, such as mixtures thereof, may be further included. The amount of the additive used is 0 to 30 parts by weight, preferably 0.1 to 20 parts by weight, more preferably 0.1 to 10 parts by weight based on 100 parts by weight of the resin constituting the upper and lower surface layers 40 and 80. Here, if the amount of the additive used is too small, the use effect of the additive may not be obtained, and if it is too large, there is a possibility that the physical properties of the surface layer may be rather deteriorated. In addition, according to the needs of the upper or lower surface layer (40,80) or both surfaces of the surface layer can be surface treatment, such as corona, it can be given additional features, such as print aptitude improvement and adhesion improvement, 30 to 30 It may have a surface tension of 60 dyne / cm.

The center layer 60 serves as a support layer for maintaining the film form of the biaxially stretched polypropylene decor sheet film, and includes inorganic or organic additives for maintaining the unstretched particle form when the propylene polymer resin is stretched and processed. It can be, through the content control of the inorganic or organic additives can control the density and hiding power. The center layer 60 may be composed of propylene polymer resin or dispersed inorganic or organic additives. The propylene polymer resin is a propylene polymer having a propylene content of at least 50% by weight. For example, it may be selected from the group consisting of propylene homopolymers, propylene and α-olefin copolymers (propylene content of 50 to 99% by weight) and mixtures thereof, preferably propylene homopolymers. The propylene content here represents the weight of propylene units relative to the total polymer weight. The α-olefin copolymerized with propylene may be, for example, ethylene, 1-butene, 1-pentene, 1-hexene, 1-methyl-1-pentene, 1-octene, 1-decene, mixtures thereof, and the like. In addition, the α-olefin imparts a function such as heat adhesiveness and adhesiveness to the propylene copolymer.

The inorganic or organic additive dispersed in the center layer 60 serves as an internal spacer when the propylene polymer resin is stretched to form pores or voids in the propylene polymer resin. That is, when the propylene polymer resin is stretched, a component that is not compatible with polypropylene and is not stretched helps to form pores in the propylene polymer resin. The pore size and the density of the center layer 60 may be adjusted according to the size, physical properties, etc. of the inorganic or organic additives, and the hiding power of the center layer 60 may be adjusted according to the refractive index difference of the components of the center layer 60.

Examples of the product that can be used as the inorganic additive may include inorganic white pigments such as titanium dioxide and fillers. Specific examples of the filler include calcium carbonate (CaCO3), montmorillonite, montmorillonite, bentonite, kaolinite, mica, hectorite, hectorite, fluorohectorite, saponite (saponite), beidelite, nontronite, stevensite, vermiculite, halosite, volkonskoite, suconite, magadai And mixtures thereof, such as magadite and kenyalite.

As the organic additive, a non-polypropylene-based organic polymer having low compatibility with the propylene polymer may be used, preferably higher than the melting point of the propylene polymer (generally about 160 ° C), preferably 5 ° C or more, and more preferably. Has a high melting point (Tm) of 10 ° C. or higher, or a surface tension with a propylene polymer (surface tension of polypropylene: about 30 to 31 mN / m) is 2 mN / m or more, preferably 3 mN / m or more, more preferably 5 mN / m or more synthetic resin can be used.

In addition, as the synthetic resin which is an organic additive, polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS), polycarbonate (PC), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), Polyamide (Nylon, 4/6, 6/6, 6/10, 6), Polyethylene Terephthalate (PET), Polyethylene Terephthalate (PET) -Elastomer, Polyester Copolymer (PET-G), Polyphenylene Sulfite (PPS), polymethyl pentane (PMP), polyimide (PI), a mixture thereof, etc. can be illustrated.

In order to further increase the effect of the inorganic white pigment and the filler, an organic white pigment, an antioxidant, an antistatic agent, a lubricant, an antiblocking agent, an antifogging agent, and a plasticizer may be used.

The inorganic additive may be mixed with the propylene polymer resin in the form of a masterbatch (M / B) of the propylene polymer. The amount of the inorganic additive used is 1 to 60 parts by weight, preferably 2 to 50 parts by weight, and more preferably 5 to 40 parts by weight based on 100 parts by weight of the propylene polymer resin. If the amount of the inorganic additive is too small, insufficient porosity is formed in the central layer 60 to insufficiently control the density of the biaxially stretched polypropylene decor sheet film, and if the amount of the inorganic additive is too large, the center layer ( There is a fear that the strength of 60) will be insufficient. The particle size of the inorganic additive is usually 0.1 to 30 μm, preferably 0.1 to 15 μm, more preferably 0.1 to 10 μm. If the particle size of the inorganic additive is too small, there is a fear that pores of sufficient size may not be formed. If the particle size of the inorganic additive is too large, the size of the pores may be excessively large and the strength of the center layer 60 may be lowered.

If necessary, the organic modifier may be added to the center layer 60 to further control the compatibility and pore size of the inorganic additive and the propylene polymer resin. On the contrary, if no pore is needed in the center layer 60, the inorganic It is possible to produce a film with only pigments without including additives. Organic modifiers that increase the compatibility of the inorganic additive and the propylene polymer resin include ethylene-ethyl acrylate (EEA), polyethylene graft maleic anhydride (PE-g-MA), polypropylene graft maleic anhydride (PP-g-MA ), Ethylene-propylene rubber graft maleic anhydride (EPR-g-MA), ethylene-octene rubber graft maleic anhydride (EOR-g-MA), ethylene-propylene-diene monomer rubber graft maleic anhydride (EPDM-g- MA), polyethylene graft acrylic acid (PE-g-AA), ethylene-propylene rubber graft acrylic acid (EPR-g-AA), ethylene-octene rubber graft maleic anhydride (EOR-g-MA), ethylene-propylene-diene monomer Rubber graft acrylic acid (EPDM-g-AA), mixtures thereof, etc. can be illustrated. The use amount of the said organic modifier is 0.1-10 weight part with respect to 100 weight part of propylene polymer resins, Preferably it is 0.1-5 weight part. Here, if the amount of the organic modifier is too small, the compatibility improvement effect is insignificant, if too large, there is a fear that the physical properties of the center layer 60 rather deteriorate without particular benefit.

The intermediate layers 50 and 70 may further assist the characteristics of hiding power, lack of thickness, etc., which are insufficient only by the surface layers 40 and 80 and the center layer 60. In addition, it may include an inorganic or organic additives to maintain the non-stretched particle form, it is possible to control the density and hiding power, etc. by controlling the content of the inorganic or organic additives. The intermediate layers 50 and 70 may have the same components as the surface layers 40 and 80 or the center layer 60 or may form a complementary configuration. When the polypropylene decor sheet film is manufactured in a three-layer structure, it may not exist, and in the case of manufacturing in a multilayer structure of three or more layers, an inorganic white such as titanium dioxide (Titanium Dioxide) is applied to the polypropylene resin in order to provide hiding power characteristics. Pigments, organic white pigments, antioxidants, antistatic agents, lubricants, antiblocking agents, fillers, antifogging agents, plasticizers and the like can be further prescribed. As a resin composition of the said intermediate | middle layer (50, 70). Propylene homopolymers, propylene α-olefin copolymers, copolymer resins using three or more α-olefins, and mixtures thereof. The copolymerized α-olefin may be, for example, ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-methyl-1-pentene, 1-octene, 1-decene, mixtures thereof, and the like. .

The adhesive layer 90 is a layer that helps the biaxially stretched polypropylene decor sheet film and the plywood to adhere. In more detail, a solvent-free adhesive (Hot-melt Lami) is laminated on the lower surface of the lower surface layer 80, the veneer can be produced by heat bonding with a plywood such as MDF or PB. The solvent-free adhesives include ethylene vinyl acetate resin (EVA), thermoplastic polyurethane (TPU), polyethylene (PE), polypropylene (PP), 1,2-component reactive urethane adhesive (PU), and the like. Moreover, it is not limited to a solventless adhesive agent, A conventional solvent adhesive can also be used. For example, vinyl acetate type (PVA), latex type, acryl type, EVA type or the like can be used. The usage-amount of the said adhesive agent is 1 micrometer-200 micrometers, Preferably it is 2 micrometers-100 micrometers. If the adhesive is too small, there is a problem of delamination, if too much, there is a problem that the adhesive is released to the side by pressing.

The overall thickness of the biaxially stretched polypropylene decor sheet film composed of the printed layer 30, the upper surface layer 40, the center layer 60, the lower surface layer 80, and the intermediate layers 50, 70 is determined by the use and design of the product. Although it may vary, it is usually 20 to 500 ㎛ in consideration of productivity, price competitiveness, physical properties and the like. In the present invention, the thickness of the center layer 60 is usually 50% or more, preferably 60% or more, and more preferably 70% or more of the total thickness of the biaxially stretched polypropylene decor sheet. If the thickness of the center layer 60 is too thin, there is a fear that the formation of the biaxially stretched polypropylene decor sheet film during the extrusion and stretching process is difficult. The thickness of the surface layer 40 and the intermediate layer (50, 70) can also be freely adjusted according to the use and design of the product, but considering the hiding power control, printability, heat resistance, etc., the upper and lower surface layer (40, 80) is the center 0.1 to 30% of the thickness of the layer 60, preferably 0.5 to 25% of the thickness, the intermediate layer 50, 70 is 0.1 to 40% of the thickness of the center layer 60, preferably 0.5 to Has a thickness of 30%. The thickness of the printed layer 30 usually has a thickness of 1 μm or less. In addition, the adhesive layer 90 has a thickness of usually 5 to 400%, preferably 10 to 120% of the thickness of the center layer 30. The upper and lower surface layers 40 and 80, the intermediate layers 50 and 70, and the center layer 60 may be formed in a multilayer structure such as two or three layers, as well as a single layer, depending on the function and use. Therefore, the biaxially stretched polypropylene decor sheet film according to the present invention has a multilayer structure of at least three layers, and may have a multilayer structure of five or more layers, depending on the design. In addition, the thickness of the protective film 200 is 10 to 200% of the biaxially stretched polypropylene decor sheet film thickness. Preferably it has a thickness of 20 to 120%. The adhesive layer 20 disposed below the protective film 200 generally has a thickness of 30 to 80% of the thickness of the entire protective film 200. In addition, the thickness of the center layer 60 is 20 to 200 ㎛, the thickness of the protective film 200 is 10 to 400% of the thickness of the center layer 60, the adhesive layer 20 is the center layer 60 ) Is 2 to 300% of the thickness, the thickness of the upper surface layer 40 is 0.1 to 30% of the thickness of the center layer 60, the lower surface layer 80 is 0.1 to the thickness of the thickness of the center layer 60. 30%.

The biaxially stretched polypropylene decor sheet film according to the present invention is melted by putting each resin component into different extruders. The molten resin may be co-extruded in the form of a laminated polypropylene sheet, and then stretched to prepare a film for polypropylene decor sheet. Specifically, the center layer 60 resin composition, the upper and lower surface layer (40, 80) resin composition, and the intermediate layer (50, 70) resin composition, if necessary, by melting and kneading with an extruder, the upper surface layer ( 40), an intermediate layer 50, a film stack in which the center layer 60, the intermediate layer 70, and the lower surface layer 80 are sequentially stacked are formed in a T-Die and formed in a single sheet form. By co-extrusion, the base film 300 may be manufactured and stretched to produce a biaxially stretched polypropylene decor sheet film according to the present invention. The film laminate may form a biaxially oriented polypropylene (BOPP) biaxially stretched in the machine direction and in the transverse direction. The printed film 30 is manufactured by printing a pattern on the upper surface layer 40 of the base film, and the poly film including the protective film 200 is formed by heating and compressing the base film 300 and the protective film 200. Propylene decorsheet films can be prepared. The primer is applied to the lower surface of the lower surface layer 80 of the polypropylene decorative sheet film including the protective film 200, and then the adhesive layer 90 is laminated to heat-compress with the plywood 100.

The veneer produced by this patent is represented in more detail in FIG. 2 is a view showing a cross-sectional structure of the biaxially stretched polypropylene decor sheet film and the plywood containing a protective film according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited by the following Examples.

Example 1 Preparation of Biaxially Stretched Polypropylene Decor Sheet Film Containing a Protective Film

The resin of the composition shown in Table 1 below was put into different extruders and melted. The melted resin is co-extruded with a T-die to form a sheet, and then the formed sheet is cooled and stretched 5 times in the machine direction and 9.5 times in the width direction to form a biaxially stretched white opaque film. A biaxially oriented polypropylene decorate film (60 μm) was produced. Subsequently, the protective film 10 was laminated with an ethylene vinyl acetate resin on the lower portion of the co-extruded propylene resin and ethylene resin to prepare protective films 10 and 20. The protective films 10 and 20 were thermally bonded to the printing layer 30 of the biaxially stretched polypropylene decor sheet film. Through this, the decorative sheet film was protected with a printed layer 30 consisting of a total 90 ㎛ consisting of a printed film 60 ㎛ and a protective film 30 ㎛. Evaluation results of the physical properties of the biaxially stretched polypropylene decor sheet film prepared in the above examples and the adhesion between the films are shown in Table 7 below.

division layer
Resin and Composition thickness
(Μm) Example 1






Protective film

Protective layer
(1) 85 wt% of polypropylene resin (melting temperature: 157 ° C) 20
(1) 100 wt% of polyethylene resin (melting temperature: 124 ° C) Adhesive layer (1) 100 wt% EVA (melting temperature: 83 ° C) 10 Base Film



Upper surface layer (1) 100 wt% EVA (melting temperature: 83 ° C) 3 Mezzanine (1) 85 wt% of polypropylene resin (melting temperature: 157 ° C)
(2) 50 wt% of titanium dioxide (TiO2) Master batch 10 wt%
(3) Master Batch 5% with 70 wt% of calcium carbonate (CaCO3) 3 Center layer (1) 85 wt% of polypropylene resin (melting temperature: 157 ° C)
(2) 50 wt% of titanium dioxide (TiO2) Master batch 10 wt%
(3) Master Batch 5% with 70 wt% of calcium carbonate (CaCO3) 48 Mezzanine (1) 85 wt% of polypropylene resin (melting temperature: 157 ° C)
(2) 50 wt% of titanium dioxide (TiO2) Master batch 10 wt%
(3) Master Batch 5% with 70 wt% of calcium carbonate (CaCO3) 3 Bottom surface layer (1) 100 wt% of propylene and α-olefin copolymer (melting temperature: 125 ° C) 3

Example 2 Preparation of Biaxially Stretched Polypropylene Decor Sheet Film Containing a Protective Film

It was prepared in the same manner as in Example 1 except for the resin having the composition shown in Table 2. The evaluation results of the physical properties of the biaxially stretched polypropylene decor sheet film prepared as in Example and the adhesive strength between the films are shown in Table 7 below.

division layer
Resin and Composition thickness
(Μm) Example 2






Protective film

Protective layer (1) 85 wt% of polypropylene resin (melting temperature: 157 ° C) 20 (1) 100 wt% of LLDPE (melting temperature: 124 ° C.) Adhesive layer (1) 100 wt% EVA (melting temperature: 83 ° C) 10 Base Film



Upper surface layer (1) 100 wt% EVA (melting temperature: 83 ° C)
(2) 100 wt% of LDPE (melting temperature: 105 ° C) 3 Mezzanine (1) 85 wt% of polypropylene resin (melting temperature: 157 ° C)
(2) 50 wt% of titanium dioxide (TiO2) Master batch 10 wt% 3 Center layer (1) 85 wt% of polypropylene resin (melting temperature: 157 ° C)
(2) 50 wt% of titanium dioxide (TiO2) Master batch 10 wt%
(3) Master Batch 5% with 70 wt% of calcium carbonate (CaCO3) 48 Mezzanine (1) 85 wt% of polypropylene resin (melting temperature: 157 ° C)
(2) 50 wt% of titanium dioxide (TiO2) Master batch 10 wt%
(3) Master Batch 5% with 70 wt% of calcium carbonate (CaCO3) 3 Bottom surface layer (1) 100 wt% of propylene and α-olefin copolymer (melting temperature: 125 ° C) 3

Example 3 Preparation of Biaxially Stretched Polypropylene Decor Sheet Film Containing a Protective Film

It was prepared in the same manner as in Example 1 except for the resin having the composition shown in Table 3 below. The evaluation results of the physical properties of the biaxially stretched polypropylene decor sheet film prepared as in Example and the adhesive strength between the films are shown in Table 7 below.

division layer
Resin and Composition thickness
(Μm) Example 3






Protective film

Protective layer (1) 85 wt% of polypropylene resin (melting temperature: 157 ° C) 20 (1) 100 wt% of LLDPE (melting temperature: 124 ° C.) Adhesive layer (1) 100 wt% EVA (melting temperature: 83 ° C) 10 Base Film



Upper surface layer (1) 100 wt% of LDPE (melting temperature: 105 ° C) 3 Mezzanine (1) 100 wt% of propylene and α-olefin copolymer (melting temperature: 125 ° C)
(2) 50 wt% of titanium dioxide (TiO2) Master batch 10 wt% 3 Center layer (1) 85 wt% of polypropylene resin (melting temperature: 157 ° C)
(2) 50 wt% of titanium dioxide (TiO2) Master batch 10 wt%
(3) Master Batch 5% with 70 wt% of calcium carbonate (CaCO3) 48 Mezzanine (1) 85 wt% of polypropylene resin (melting temperature: 157 ° C)
(2) 50 wt% of titanium dioxide (TiO2) Master batch 10 wt%
(3) Master Batch 5% with 70 wt% of calcium carbonate (CaCO3) 3 Bottom surface layer (1) 100 wt% of propylene and α-olefin copolymer (melting temperature: 125 ° C) 3

Comparative Example 1 Preparation of Biaxially Stretched Polypropylene Decor Sheet Film Containing a Protective Film

As shown in Table 4 below, an acrylic primer was applied to the existing polypropylene protective film and the printed film surface, and an EVA solvent adhesive was applied therebetween to bond the two films. A biaxially stretched polypropylene deco sheet film having a 5-layer structure was prepared and used in the same manner as in the above example. 30 μm in thickness, and the total thickness of the decor sheet layer was prepared in 90 μm. The primer layer and the adhesive layer composed of the liquid phase may vary in thickness depending on the time or distribution of drying depending on the application site. The evaluation results of the physical properties of the biaxially stretched polypropylene decor sheet film prepared as in Example and the adhesive strength between the films are shown in Table 7 below.

division layer
Resin and Composition thickness
(Μm) Comparative example
One





protect
film Protective layer (1) 85 wt% of polypropylene resin (melting temperature: 157 ° C) 30 Primer layer (1) acrylic primer (surface treatment layer) 1 to 2 glue Adhesive layer (1) EVA type solvent adhesive 6 to 8 materials
film
Primer layer (2) Acrylic primer (surface treatment layer) 1 to 2 Upper surface layer (1) 100 wt% of propylene and α-olefin copolymer (melting temperature: 125 ° C) 3 Mezzanine (1) 85 wt% of polypropylene resin (melting temperature: 157 ° C)
(2) 50 wt% of titanium dioxide (TiO2) Master batch 10 wt%
(3) Master Batch 5% with 70 wt% of calcium carbonate (CaCO3) 3 Center layer (1) 85 wt% of polypropylene resin (melting temperature: 157 ° C)
(2) 50 wt% of titanium dioxide (TiO2) Master batch 10 wt%
(3) Master Batch 5% with 70 wt% of calcium carbonate (CaCO3) 48 Mezzanine (1) 85 wt% of polypropylene resin (melting temperature: 157 ° C)
(2) 50 wt% of titanium dioxide (TiO2) Master batch 10 wt%
(3) Master Batch 5% with 70 wt% of calcium carbonate (CaCO3) 3 Bottom surface layer (1) 100 wt% of propylene and α-olefin copolymer (melting temperature: 125 ° C) 3

Comparative Example 2 Preparation of Biaxially Stretched Polypropylene Deco Sheet Film Containing a Protective Film

As shown in Table 5, the polypropylene protective film used in the Example and the base film of the printing film used in Comparative Example 1 was prepared by thermally laminating the printing film of the conventional synthetic paper structure not coated with an acrylic primer. The thickness of the print film was set to 60 μm in the same manner as in the film of Example, the thickness of the protective film was composed of 30 μm in the same manner as in Example, and the thickness of the entire decor sheet layer was prepared to be 90 μm. The evaluation results of the physical properties of the biaxially stretched polypropylene decor sheet film prepared as in Example and the adhesive strength between the films are shown in Table 7 below.

division layer
Resin and Composition thickness
(Μm) Comparative Example 2






Protective film

Protective layer (1) 85 wt% of polypropylene resin (melting temperature: 157 ° C) 20 (1) 100 wt% of LLDPE (melting temperature: 124 ° C.) Adhesive layer (1) 100 wt% EVA (melting temperature: 83 ° C) 10 Base Film



Upper surface layer (1) 100 wt% of propylene and α-olefin copolymer (melting temperature: 125 ° C) 3 Mezzanine (1) Propylene resin (melting temperature: 157 ° C) 85 wt%
(2) 50 wt% of titanium dioxide (TiO2) Master batch 10 wt%
(3) Master Batch 5% with 70 wt% of calcium carbonate (CaCO3) 3 Center layer (1) 85 wt% of propylene resin (melting temperature: 157 ° C)
(2) 50 wt% of titanium dioxide (TiO2) Master batch 10 wt%
(3) Master Batch 5% with 70 wt% of calcium carbonate (CaCO3) 48 Mezzanine (1) 85 wt% of propylene resin (melting temperature: 157 ° C)
(2) 50 wt% of titanium dioxide (TiO2) Master batch 10 wt%
(3) Master Batch 5% with 70 wt% of calcium carbonate (CaCO3) 3 Bottom surface layer (1) 100 wt% of propylene and α-olefin copolymer (melting temperature: 125 ° C) 3

Comparative Example 3 Preparation of Biaxially Stretched Polypropylene Deco Sheet Film without Protective Film

As shown in Table 6, the polypropylene protective film used in the Example was not used, and the acrylic film was applied to the base film of the printing film used in Comparative Example 1 and immediately printed to print the print film. Produced. The thickness of the printing film was set to 60 µm in the same manner as the film of the example. Evaluation results for the physical property evaluation of the biaxially stretched polypropylene decor sheet film prepared in the same manner as in the above embodiment is shown in Table 7.

division
layer Resin and Composition thickness
(Μm) Comparative Example 3




materials
film
Primer layer (1) Acrylic primer (surface treatment layer) 1 to 2 Upper surface layer (1) 100 wt% of propylene and α-olefin copolymer (melting temperature: 125 ° C) 3 Mezzanine (1) 85 wt% of propylene resin (melting temperature: 157 ° C)
(2) 50 wt% of titanium dioxide (TiO2) Master batch 10 wt%
(3) Master Batch 5% with 70 wt% of calcium carbonate (CaCO3) 3 Center layer (1) 85 wt% of propylene resin (melting temperature: 157 ° C)
(2) 50 wt% of titanium dioxide (TiO2) Master batch 10 wt%
(3) Master Batch 5% with 70 wt% of calcium carbonate (CaCO3) 48 Mezzanine (1) 85 wt% of propylene resin (melting temperature: 157 ° C)
(2) 50 wt% of titanium dioxide (TiO2) Master batch 10 wt%
(3) Master Batch 5% with 70 wt% of calcium carbonate (CaCO3) 3 Bottom surface layer (1) 100 wt% of propylene and α-olefin copolymer (melting temperature: 125 ° C) 3

The evaluation results of the physical properties of the decorative sheet films of the above-described examples and comparative examples and the evaluation results of the adhesion strength after the adhesion between the films are shown in Table 7 below.

division density
(g / cm3) Transmittance
(%) Film-to-film adhesion
(Hot adhesion 110 to 120) Pencil hardness
(Load 0.3, angle 45 degrees) Example 1 0.85 15 Adhesion 2H Example 2 0.85 15 Adhesion 2H Example 3 0.85 15 Adhesion 2H Comparative Example 1 0.85 15 Adhesion 2H Comparative Example 2 0.85 15 Poor adhesion 2H Comparative Example 3 0.80 17 - HB

The density of the biaxially stretched polypropylene decor sheet films prepared by the above Examples and Comparative Examples was measured using ASTM D 1505. As shown in Table 5, in the case of using the inorganic additive, microvoids are formed inside the stretching process, thereby lowering the density of the biaxially stretched polypropylene decor sheet film.

Transmittance was evaluated to evaluate the hiding power of the biaxially stretched polypropylene decor sheet film, and the transmittance was measured according to ASTM D 1003, and the results are shown in Table 5 below. As shown in Table 7, when the voids are formed by using the inorganic additive, the difference in refractive index between the void surface and the water surface is increased, and thus the light transmittance is lowered, thereby improving hiding power. When using a protective film, a slight increase in hiding power can be observed. The protective film and the base film were hot pressed between the temperatures of 110 to 120, the adhesive strength was directly peeled off the film to evaluate the adhesion, it was observed that the film is torn on the protective film and the base film adhesion.

In addition, the pencil hardness (Pencil hardness) was fixed to the pencil at a load 0.3kg, angle 45 ° and then determined whether the scratches with the naked eye to scratch the Examples and Comparative Examples for each pencil hardness. When measuring the hardness of the pencil without the protective film, compared with the results that are generally measured below H, it can be seen that the scratch resistance is increased due to the protective film.

By comparing the Examples and Comparative Examples in Table 7, it was confirmed that the polypropylene decor sheet film produced by the production method of the present invention has the same physical properties and adhesive strength as the polypropylene decor sheet film prepared by the conventional production method. As a result, it is possible to obtain a polypropylene decor sheet film having good physical properties without omitting the existing process step, it is possible to manufacture a veneer with economical and improved productivity through a simplified process.

Claims (13)

Heat-adhesive, polypropylene layer selected from the group consisting of propylene resin, ethylene resin or propylene polymer with propylene and ethylene content of 5 to 70% by weight and mixtures thereof, ethylene resin and ethylene content of 30 to 95% by weight Phosphorus ethylene and one or more α-olefin copolymers, ethylene and vinyl acetate copolymers, ethylene and vinyl alcohol copolymers, ethylene and vinylacetic acid copolymers, and mixtures thereof. A protective film 200 including an adhesive layer 20 composed of a solvent-free adhesive made of a protective layer 10 and ethylene vinyl acetate resin (EVA) alone or a mixture of ethylene vinyl acetate resin (EVA) and other mixtures; And
It is formed on the lower portion of the protective film 200, the main layer 60, which serves as a support layer for maintaining the film form, is formed on the top of the center layer 60, propylene homopolymer, propylene content 50 to 99 weight % Propylene and one or more α-olefin copolymers, polyethylene or ethylene with an ethylene content of 30 to 95% by weight and one or more α-olefin copolymers or an ethylene and vinyl acetate (VA) content of 3 to 40% by weight A base film 300 including an upper surface layer 40 selected from the group consisting of vinyl acetate copolymers and mixtures thereof and a printed layer 30 printed on the upper surface layer 40; Polypropylene decor sheet film comprising a. delete According to claim 1, wherein the base film 300 further comprises a lower surface layer 80, the lower surface layer 80 is formed on the other side of the central layer 60, propylene homopolymer, propylene content of 50 To 99% by weight of a propylene and α-olefin copolymer and a mixture selected from the group consisting of a resin or a polypropylene decor sheet film comprising a MATTE compound consisting of a mixture of a polypropylene resin and a polyethylene resin . According to claim 1, wherein the center layer 60 serves as a support layer to maintain the film form, made of a propylene homopolymer, a copolymer of propylene and α-olefin having a propylene content of 50 to 99% by weight and mixtures thereof Polypropylene decor sheet film, which is selected from the group. The polypropylene decorative sheet film of claim 1, wherein the printing layer is printed with a printing machine. The polypropylene decor sheet according to claim 1, wherein the melting point peak temperature of the composition of the upper surface layer 40 is 70 to 135, and the melt index (ASTM D 1238, 190, 2.16 Kg) is 0.5 to 20.0. film. According to claim 1, wherein the base film 300 is formed under the lower surface layer (80), and further comprising an adhesive layer (90) to be bonded to the plywood (100), polypropylene decor sheet film. 4. The method of claim 3, further comprising an intermediate layer (50,70) formed between the upper and lower surface layers (40,80) and the center layer (60), wherein the intermediate layer (50,70) is a propylene homopolymer, propylene A polypropylene decorate film, comprising a resin selected from the group consisting of copolymers of propylene and α-olefins having a content of 50 to 99% by weight and mixtures thereof. The inorganic layer of claim 8, wherein the central layer 60 and the intermediate layers 50 and 70 include inorganic or organic additives that maintain unstretched particle forms, and the inorganic additives include titanium dioxide. White pigments and calcium carbonate (CaCO3), montmorillonite, bentonite, kalinite, mica, hectorite, fluorohectorite, saponite , Beidelite, nontronite, stevensite, vermiculite, halosite, volkonskoite, suconite, magadite ), Kenyalite, and mixtures thereof, the organic additives being polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS), polycarbonate (PC), polymethyl Methacrylate (PMMA), polybutylene terephthalate (PBT), polyamide (Nylon, 4/6, 6/6, 6/10, 6), polyethylene terephthalate (PET), polyethylene terephthalate (PET) Synthetic resins comprising elastomers, polyester copolymers (PET-G), polyphenylenesulfite (PPS), polymethylpentane (PMP), polyimide (PI) and mixtures thereof, wherein the inorganic or organic additives It is 1 to 60 parts by weight based on 100 parts by weight of the propylene polymer of the center layer (60) and the intermediate layer (50, 70), polypropylene decor sheet film. The method of claim 1, further comprising an additive selected from the group consisting of antioxidants, UV stabilizers, UV absorbers, antistatic agents, lubricants, antiblocking agents, fillers, antifog agents, plasticizers, compatibilizers, and mixtures thereof. , Polypropylene decor sheet film. According to claim 3, wherein the thickness of the center layer 60 is 20 to 200 ㎛, the thickness of the protective film 200 is 10 to 400% of the thickness of the center layer 60, the adhesive layer 20 is 2 to 300% of the thickness of the center layer 60, the thickness of the upper surface layer 40 is 0.1 to 30% of the thickness of the center layer 60, the lower surface layer 80 of the center layer 60 It is 0.1 to 30% of the thickness, polypropylene decor sheet film. A polypropylene layer, ethylene resin, and ethylene content of 30 to 95% by weight of the propylene resin, ethylene resin or propylene polymer having a propylene and an ethylene polymer having a ethylene content of 5 to 70% by weight, and a mixture thereof. Phosphorus ethylene and one or more α-olefin copolymers, ethylene and vinyl acetate copolymers, ethylene and vinyl alcohol copolymers, ethylene and vinylacetic acid copolymers, and mixtures thereof. Preparing a protective film 200 including an adhesive layer 20 composed of a solvent-free adhesive made of a protective layer 10 and an ethylene vinyl acetate resin (EVA) alone or a mixture of ethylene vinyl acetate resin (EVA) and other mixtures;
It is formed on the lower portion of the protective film 200, the main layer 60, which serves as a support layer for maintaining the film form, is formed on the top of the center layer 60, propylene homopolymer, propylene content 50 to 99 weight % Propylene and one or more α-olefin copolymers, polyethylene or ethylene with an ethylene content of 30 to 95% by weight and 3 or 40% by weight of an ethylene and one or more α-olefin copolymers or ethylene and vinyl acetate (VA) A composition of the base film 300 comprising an upper surface layer 40 selected from the group consisting of a phosphorus vinyl acetate copolymer and a mixture thereof and a printing layer 30 printed on the upper surface layer 40. Manufacturing the base film 300 by co-extrusion into a sheet form;
Manufacturing a printed layer 30 by printing a pattern on a top surface layer 40 of the base film 300 with a printing machine;
Manufacturing a biaxially stretched polypropylene decor sheet film including a protective film by heating and compressing the base film 200 and the protective film 200 including the print layer 30;
Stacking an adhesive layer 90 under the lower surface layer 80 of the polypropylene decor sheet film including the protective film; And
Method of producing a veneer wood comprising the step of heat-compressing the biaxially stretched polypropylene decorative sheet film and the plywood 100 is laminated the adhesive layer (90). The method of claim 12, wherein the printing layer 30 is printed with a printing machine.

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