CN102621811A - Developable photosensitive resin composition applied to panel structure - Google Patents

Abstract

The invention relates to a developable photosensitive resin composition applied to a panel structure, which is a developable photosensitive resin composition and comprises resin, a photosensitive initiator, a monomer, a solvent, a white pigment and a dispersant; wherein, the white pigment accounts for 20 to 45 weight percent of the photosensitive resin composition, so that the photosensitive resin composition presents white appearance color, the photosensitive resin composition is arranged on the periphery of one surface of a transparent substrate to form a panel structure with the function of a white decorative frame, and the panel structure can be applied to related products such as a touch panel, a flat panel display and the like.

Description

A developable photosensitive resin composition applied to panel structure

technical field

The present invention relates to the composition of the developable photosensitive resin composition, and aims to provide a developable photosensitive resin composition that can be used in related products such as touch panels or flat-panel displays, which can be different from the previous appearance color that is limited to black or The absence of dark colors enhances the matching of product appearance.

Background technique

Touch panels have been widely used in general consumer electronics products such as mobile phones, digital cameras, and satellite navigators to improve user interfaces and improve input efficiency; usually, touch panels are transparent and are configured on these The use in front of the display screen of electronic products allows users to perform interactive input operations according to the instructions on the display screen, thereby greatly improving the friendliness of the communication interface between humans and machines. In a typical touch panel structure, a touch sensor is insulated between a top plate and a substrate, and then a circuit is provided on the periphery of the laminate to transmit the touch signal on the touch sensor to the A signal processing circuit; in earlier times, the assembly method of the touch panel and the display screen mostly used a cover frame to press the surrounding edges of the surface glass of the touch panel, and the touch panel was fixed in front of the display screen for use, and In addition to the purpose of fixing the panel, the cover frame also has the function of protecting the circuit around the surface glass of the touch panel and beautifying the installation structure.

However, this conventional touch panel assembly structure often leads to many defects. For example, the setting of the cover frame will form an uneven surface on the surface glass, which will destroy the flatness of the product shape, and when cleaning and wiping the panel surface in the frame , it is easy to cause dust and dirt to get stuck in the gap between the cover frame and the surface glass of the touch panel. In addition to the sanitary problems of unclean cleaning, the accumulation of dust and dirt in the gap between the frame edges is also very easy to cause the touch panel to break down. In addition, the circuit structure at the edge of the touch panel is usually relatively fragile, and it is easily damaged by the accumulation and extrusion of dirt stuffing, resulting in poor communication. In addition, the dirt stuffed in the gaps of the frame edge will damage the shell and the touch panel. The tightness between the panels will affect the waterproof and dustproof effect, and even cause damage to the internal electrical components.

Another known touch panel can also add a decorative layer on the surface glass. The decorative layer generally uses a frame structure composed of dark non-conductive materials to cover the surrounding circuits under the surface glass, and at the same time achieve Full flat touch panel; however, the production process using the pasting method is complicated, and the chance of causing errors during production will also increase, and the decorative layer is mostly black or silver. Although it improves the texture of the product, it also makes it Exterior colors are limited and not variable.

Contents of the invention

In view of this, the present invention aims to provide a device that can be applied to related products such as touch panels or flat-panel displays, so as to improve the matching appearance of products.

In order to achieve the above object, the photosensitive resin composition of the present invention contains resin, photoinitiator, monomer, solvent, white pigment and dispersant; wherein, the white pigment is 20 ~ 45wt in the photosensitive resin composition %, so that the photosensitive resin composition presents a white appearance color.

The present invention can be applied to related products such as touch panels or flat-panel displays, wherein the photosensitive resin composition can be arranged on the peripheral edge of one of the surfaces of a light-transmitting substrate to form a panel structure with a white decorative frame, and can also be It forms a shielding effect on the circuit layer at the lower peripheral part.

Description of drawings

Fig. 1 is a schematic structural diagram of a panel in the present invention.

Description of figure numbers: panel structure 1; light-transmitting substrate 11; lower surface 111; white frame layer 12; circuit 13.

Detailed ways

The photosensitive resin composition of the present invention contains 15~35wt% of resin, 0.5~10wt% of photoinitiator, 0~20wt% of monomer, 25~50wt% of solvent, 20~45wt% of white pigment and 1~5wt% dispersant.

Wherein: the resin can be a polymer or copolymer containing carboxylic acid groups (COOH), such as but not limited to acrylic resin, acrylic-epoxy resin, acrylic-melamine resin, acrylic Force-styrene resin, phenol-phenolic resin, or a mixture of the above resins. Due to the high specific gravity of white pigments, precipitation is more likely to occur, so the molecular weight of the resin must be greater than 8000, and the proportion of resin molecular weight above 8000 can slow down the precipitation of white raw materials. But on the other hand, if the molecular weight is too large, it will be difficult to handle. Therefore, the molecular weight is preferably below 100,000, and more preferably in the range of 20,000-70,000.

The function of the photoinitiator lies in the photosensitivity and resolution ability, which may include but not limited to oxime ester compounds, acetophenone compounds, benzophenone compounds or diimidazole compounds, or any of the above photoinitiators mix.

The function of the monomer is to provide better adhesion, development, resolution, etc., and may include but not limited to multifunctional acrylate monomers, water-insoluble monomers or water-soluble monomers. The multifunctional acrylate The monomer can be trimethylpropane triacrylate, tripropylene glycol diacrylate, 1,6 hexanediol diacrylate; and the water-insoluble monomer can be penterythritol triacrylate, tri Methyl ether propane triacrylate, trimethyl ether propane trimethacrylate, tri, di-ethanol isocyanate triacrylate, di, trimethanol propane tetraacrylate, diisopentylthritol pentaacrylate, pentaacrylate , pentaerythritol tetraacetate, dihexanethritol hexaacetate, diisopentylthritol hexaacetate, or multifunctional monomers, dendrimers/polyplexes acrylate oligomers, polyplexes polyether acrylates, carbamic acid Ethyl ester; and this water-soluble monomer then can be the monomer of polyoxyethylene and polyoxypropylene, and it can be two-(two-oxyethylene oxyethylene) vinyl acrylate, pentadeoxyethylene trimethylol propane three Acrylates, thirty oxyethylene di,di-bis-p-phenolmethane diacrylate, thirty oxyethylene di,bis-bis-p-phenolmethane dimethacrylate, twenty oxyethylene trimethylolpropane triacrylate , 15 oxyethylene trimethanol propane triacrylate, 550 oxyethylene monomethacrylate, 200 oxyethylene diacrylate, 400 oxyethylene diacrylate, 400 Oxyethylene dimethacrylate, six hundred oxyethylene diacrylate, six hundred oxyethylene dimethacrylate, polyoxypropylene monomethacrylate; or two or more monomers can be added to form a total monomer body.

The white pigments include but are not limited to titanium dioxide, white lead, zinc oxide, zinc sulfide, lithopone or antimony oxide; In order to achieve the masking effect, the white pigment needs to account for more than 20% of the photosensitive resin composition to achieve the masking effect, and if it exceeds 45%, poor development will occur. The solvent is used to adjust the viscosity, which can be propylene glycol monomethyl ether acetate; the photosensitive resin composition can be further added with an appropriate amount of additives, such as a surfactant.

The overall photosensitive resin composition has a white appearance color due to the addition of white pigments, and another other pigment can also be added, such as adding Blue Pigment 15 to appear blue, adding Pigment Green 7 to appear green, or adding other colors powder to achieve the desired color.

The photosensitive resin composition of the present invention can be applied to related products such as touch panels or flat panel displays, and it is coated with the photosensitive resin composition of the present invention on a light-transmitting substrate through a spin coating (spin coating) step. On the upper surface of the light-transmitting substrate, the steps of vacuum dry, pre-baking, exposure, developing, and post-baking are sequentially performed to make the light-transmitting A white frame layer 12 is formed on the periphery of the lower surface 111 of the substrate 11, as shown in FIG. 11. Relative to the white frame layer 12 formed by the photosensitive resin composition, a plurality of circuits 13 can be further provided for the conduction of the touch signal, and the white frame layer 12 can completely cover the circuits 13 at the periphery. Accordingly, the smoothness of the touch panel can be ensured, and the effect of protecting the peripheral circuits of the touch panel can also be achieved, and the appearance of related products such as the touch panel or flat-panel display applied in the present invention can be different from the past where the color of the appearance was limited to black or black. The lack of dark color can greatly improve the matching of product appearance.

Specific examples are described below, however, the present invention is not limited thereto.

The photosensitive resin composition adopts the following composition, as listed in Table 1 and Table 2.

Table 1 Composition of the photosensitive resin composition.

Table 2 Composition of photosensitive resin composition.

The test method is as follows.

1. Precipitation observation.

The optical density (Optical Density) measurement of the examples and comparative examples (take the upper 1/3 of the sample), the measurement day is the first day after preparation and the 7th day after preparation, during which the samples are kept at room temperature for static testing. And irradiate each sample with a wavelength of 380nm-780nm to compare the difference in OD value.

OD value difference=∣(OD value of the seventh day-OD value of the first day)/OD value of the first day∣*100%

2. Observe the shielding effect (under the same film thickness).

On the first day after the preparation of the photosensitive resin composition, the metal circuits were individually placed under the glass slides coated with the photosensitive resin compositions of Examples and Comparative Examples, and observed under shielding. Whether the metal circuit is visible, the shielding test results of each embodiment and comparative example are shown in Table 3. 

the Example 1 Example 2 Example 3 Example 4 Comparative example 1 Comparative example 2 OD difference 0.53% 0.62% 0.85% 0.71% 3.25% 0.58% Covering ◎ ◎ ◎ ◎ ◎ ○

◎ Good ○ Fair.

Table 3 Test results.

As can be seen in Table 3, the difference in OD value between each embodiment and the comparative example is larger than that of the comparative example 1, indicating that the acrylic resin with a molecular weight of 5000 is used, and the precipitation phenomenon is more obvious, while the content of the white pigment in the comparative example 2 Less than 20 wt%, in the comparison of masking properties, the masking properties of Comparative Example 2 are relatively poor, so the composition components and ratios of Comparative Example 1 and Comparative Example 2 are not suitable for the purpose of the invention of the present invention, and the embodiment The composition components and ratios of 1-4 are preferred embodiments of the present invention.

Claims (10)

1. A developable photosensitive resin composition applied to a panel structure, characterized in that the photosensitive resin composition is coated on a surface periphery of a light-transmitting substrate to form a panel structure, and the photosensitive resin composition It contains 15-35wt% resin, 0.5-10wt% photoinitiator, 0-20wt% monomer, 25-50wt% solvent, 20-45wt% white pigment and 1-5wt% dispersant. 2. The developable photosensitive resin composition applied to the panel structure according to claim 1, wherein the resin comprises but not limited to acrylic resin, acrylic-epoxy resin, acrylic-melt Dish-resistant resin, acrylic-styrene resin, phenol-phenolic resin, or a mixture of the above resins. 3. The developable photosensitive resin composition for panel structure as claimed in claim 1, wherein the resin contains acrylic acid. 4. The developable photosensitive resin composition applied to panel structures as claimed in claim 1, wherein the photosensitive initiator includes but not limited to oxime ester compounds, acetophenone compounds, benzophenone Compounds or diimidazole compounds, or a mixture of the above photoinitiators. 5. The developable photosensitive resin composition applied to panel structure as claimed in claim 1, wherein the monomer comprises but not limited to multifunctional acrylate monomer, water-insoluble monomer or water-soluble monomer body, the polyfunctional acrylate monomer can be trimethylpropane triacrylate, tripropylene glycol diacrylate, 1,6 hexanediol diacrylate; and the water-insoluble monomer can be penterythr Alginate triacrylate, trimethyl ether propane triacrylate, trimethyl ether propane trimethacrylate, tri, di-ethanol isocyanate triacrylate, di, trimethylol propane tetraacrylate, diisopentyl tetraacrylate Alcohol pentaacrylate, pentaacrylate, pentaerythritol tetraacetate, dihexanethritol hexaacetate, dipentylitol hexaacetate, or polyfunctional monomers, dendrimers/polyplex acrylate oligomers, Multi-cluster polyether acrylate, urethane; and the water-soluble monomer can be polyoxyethylene and polyoxypropylene monomers, which can be two-(two-oxyethylene oxyethylene) vinyl acrylate, ten Five polyoxyethylene trimethanol propane triacrylate, thirty oxyethylene di, di-bis-p-phenolmethane diacrylate, thirty oxyethylene di, bis-bis-p-phenolmethane dimethacrylate, twenty Oxyethylene trimethylolpropane triacrylate, fifteen oxyethylene trimethylolpropane triacrylate, five hundred and fifty oxyethylene monomethacrylate, two hundred oxyethylene diacrylate, four hundred oxyethylene Ethylene diacrylate, four hundred oxyethylene dimethacrylate, six hundred oxyethylene diacrylate, six hundred oxyethylene dimethacrylate, polyoxypropylene monomethacrylate; or add two The above monomers are mixed into a comonomer. 6 . The developable photosensitive resin composition for panel structure as claimed in claim 1 , wherein the solvent is propylene glycol monomethyl ether acetate. 7. The developable photosensitive resin composition applied to the panel structure according to any one of claims 1 to 6, wherein the white pigment includes but is not limited to titanium dioxide (titanium dioxide), lead carbonate (White lead) , Zinc oxide, Zinc sulphide, Lithopone or Antimony oxide. 8 . The developable photosensitive resin composition for panel structure according to claim 7 , wherein another pigment is further added to the photosensitive resin composition. 9 . The developable photosensitive resin composition applied to a panel structure as claimed in claim 7 , wherein the transparent substrate is further provided with a plurality of circuits relative to the photosensitive resin composition. 10. The developable photosensitive resin composition for panel structure according to any one of claims 1 to 6, characterized in that the molecular weight of the resin is preferably below 8000-100,000, preferably within the range of 20,000-70,000.

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