# US 9,049,790 B2 · Masking layer formed by applying developable photosensitive resin compositions on panel structure

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- Number: US 9,049,790 B2
- Document ID: US9049790B2
- Status: Granted
- Kind: B2
- Application number: 13/965,436
- Filed: 2013-08-13
- Published: 2015-02-19
- Granted: 2015-06-02
- Earliest claimed: 2013-08-13
- Assignees: eChem Solutions Corp.
- Applicants: eChem Solutions Corp.
- Inventors: Shih-Peng Lin; Yu-cheng Lai; Hsin-Jen Cheng; Yan-fu Pan; Yi-Lun Chiu; Tsung-Mu Yang; Chen-Wen Chiu; Chia-Ling Luo
- Web page: https://patentgrep.com/patent/US9049790B2

## CPC

- H05K 1/0296: {Conductive pattern lay-out details not covered by sub groups H05K1/02 - H05K1/0295 (H05K1/11 takes precedence; lay-out adapted to mounted component configuration H05K1/18)}
- G02F 1/133512: {Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence)}
- G02F 1/133331: {Cover glasses}
- G02F 1/133388: {with constructional differences between the display region and the peripheral region}
- G03F 7/0005: {Production of optical devices or components in so far as characterised by the lithographic processes or materials used therefor}
- G03F 7/004: Photosensitive materials (G03F7/12, G03F7/14 take precedence)
- G06F 2203/04103: Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G03F: PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR; (phototypographic composing devices B41B; photosensitive materials or processes for photographic purposes G03C; electrophotography, sensitive layers or processes therefor G03G)
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

The invention relates to a masking layer. The masking layer produced by coating a white-color photosensitive resin composition on a peripheral region of a transparent substrate, developing the white-color photosensitive resin composition to obtain a patterned composition layer, coating a gray-color photosensitive resin composition on the cured composition layer and developing the gray-color photosensitive resin composition, so that the gray-color photosensitive resin composition is cured to obtain the masking layer having an optical density (O.D.) of ≧3.5. The masking layer is adapted for use on a touch panel or a flat panel display device. The masking layer shows a white color appearance when viewed from outside and serves as a white color decoration around the peripheral region of the device. The masking layer further comprises a gray colored sub-layer to mask the electrical circuitry disposed beneath the masking layer.

## Claims

### Claim 1

A masking layer produced by coating a white-color photosensitive resin composition on a peripheral region of a surface of a transparent substrate of a panel structure, developing the white-color photosensitive resin composition to obtain a cured and patterned composition layer, and then coating a gray-color photosensitive resin composition on the patterned composition layer and developing the gray-color photosensitive resin composition, so that the gray-color photosensitive resin composition is cured and patterned to obtain the masking layer having an optical density (O.D.) of ≧3.5, wherein:
the white-color photosensitive resin composition comprises 5˜15 wt % of a resin ingredient, from more than 0 wt % to 2 wt % of a photo-initiator, 5˜15 wt % of a monomer ingredient, 40˜70 wt % of a solvent and 10˜30 wt % of a white pigment; and
the gray-color photosensitive resin composition comprises 5˜15 wt % of a resin ingredient, from more than 0 wt % to 2 wt % of a photo-initiator, 5˜15 wt % of a monomer ingredient, 40˜70 wt % of a solvent, 10˜30 wt % of a white pigment and from more than 0 wt % to 3 wt % of a black pigment.

### Claim 2 (depends on 1)

The masking layer according to claim 1, wherein the resin ingredient is selected from the group consisting of an acrylic resin, an acrylic-epoxy resin, an acrylic-melamine resin, an acrylic-styrene resin, a phenolic aldehyde resin and a mixture thereof.

### Claim 3 (depends on 1)

The masking layer according to claim 1, wherein the resin ingredient comprises acrylic functionality.

### Claim 4 (depends on 1)

The masking layer according to claim 1, wherein the photo-initiator is selected from the group consisting of an oxime ester, an acetophenone, a propiophenone compound, a butyrophenone compound, a benzophenone, a bis-imidazole and a mixture thereof.

### Claim 5 (depends on 1)

The masking layer according to claim 1, wherein the monomer ingredient is selected from the group consisting of a multifunctional acrylate monomer, a water-insoluble monomer, a water-soluble monomer and a co-monomer mixture of the monomers, wherein the multifunctional acrylate monomer is selected from the group consisting of trimethylpropanetriacrylate (TMPTA), tripropyleneglycol diacrylate (TPGDA) and 1,6-hexanedioldiacrylate (HDDA), wherein the water-insoluble monomer is selected from the group consisting of pentaerythritol triacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, Tris(2-hydroxyethyl) isocyanurate triacrylate, (di-trimethylolpropane tetraacrylate, dipentaerythritol pentaacrylate, a pentaacrylate ester, pentaerythritol tetraacrylate, dihexaerythritol hexaacrylate, dipentaerythritol hexaacrylate, a multi-functional monomer, a dendritic/hyper-branched acrylate oligomer, a hyper-branched polyester acrylate and a urethane acrylate, and wherein the water-soluble monomer is an ethoxylated monomer or a propoxylated monomer selected from the group consisting of 2(2-ethoxyethoxy)ethyl acrylate, ethoxylated (15)trimethylolpropane triacrylate, ethoxylated (30)bisphenol A diacrylate, ethoxylated(30)bisphenol A dimethacrylate, ethoxylated(20)trimethylolpropane triacrylate, methoxy polyethylene glycol(350)monomethacrylate, methoxy polyethylene glycol(550)monomethacrylate, polyethylene glycol(200)diacrylate, polyethylene glycol(400)diacrylate, polyethylene glycol(400)dimethacrylate, polyethylene glycol(600)diacrylate, polyethylene glycol(600)dimethacrylate and polypropylene glycol monomethacrylate.

### Claim 6 (depends on 1)

The masking layer according to claim 1, wherein the solvent is selected from the group consisting of propylene glycol mono-propyl ether acetate, ethylene glycol monopropyl ether, di-ethylene glycol dimethyl ether, tetrahydrofuran, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, di-ethylene glycol monomethyl ether, di-ethylene glycol monoethyl ether, di-ethylene glycol monobutyl ether, ethyl 3-ethoxy propionate and a mixture thereof.

### Claim 7 (depends on 1)

The masking layer according to claim 1, wherein the white-color photosensitive resin composition and gray-color photosensitive resin composition further comprise at least one additive.

### Claim 8 (depends on 7)

The masking layer according to claim 7, wherein the additive is selected from the group consisting of a fluoro compound or a siloxane compound.

### Claim 9 (depends on 7)

The masking layer according to claim 7, wherein the white-color photosensitive resin composition comprises from more than 0 wt % to 2 wt % of a leveling agent and from more than 0 wt % to 2 wt % of an antioxidant.

### Claim 10 (depends on 1)

The masking layer according to claim 1, wherein the pigment is selected from the group consisting of titanium dioxide, white lead (lead carbonate), zinc oxide, zinc sulphide, lithopone and antimony oxide.

### Claim 11 (depends on 1)

The masking layer according to claim 1, wherein the white-color photosensitive resin composition further comprises an additional pigment other than the white pigment.

### Claim 12 (depends on 1)

The masking layer according to claim 1, wherein the black pigment is selected from the group consisting of carbon black, titanium black and a black pigment blend of a red pigment, a green pigment and a blue pigment.

### Claim 13 (depends on 11)

The masking layer according to claim 11, wherein the red pigment is in an amount of 20˜50 wt %, the green pigment is in an amount of 5˜40 wt % and the blue pigment is in an amount of 20˜50 wt %, based on the total weight of the black pigment blend.

### Claim 14 (depends on 11)

The masking layer according to claim 11, wherein the red pigment is selected from the group consisting of Red 254 and Red 177, the green pigment is selected from the group consisting of Green 7, Green 36 and Green 58, and the blue pigment is selected from the group consisting of Blue 156 and Blue 153.

### Claim 15 (depends on 1)

The masking layer according to claim 1, wherein an electrical circuitry is disposed beneath the masking layer, so that the electrical circuitry is masked by the gray-color photosensitive resin composition.

### Claim 16 (depends on 1)

The masking layer according to claim 1, wherein the resin ingredient has a molecule weight of from 8000 to 100,000 Daltons.

### Claim 17 (depends on 15)

The masking layer according to claim 15, wherein the resin ingredient has a molecule weight of from 20,000 to 70,000 Daltons.

### Claim 18 (depends on 1)

The masking layer according to claim 1, wherein the cured composition layer formed from the white-color photosensitive resin composition has a thickness of 5˜20 μm, and the cured composition layer formed from the gray-color photosensitive resin composition has a thickness of 1˜5 μm.

### Claim 19 (depends on 1)

The masking layer according to claim 1, wherein the masking layer has a Δb* of ≦2.0, where the Δb* represents the difference between the chromaticity values measured under two different post-baking conditions.