ANTI-GLARE FILM AND PROCESS FOR PRODUCING THE SAME

• US 20110003093A1
• Filed: 03/25/2008
• Published: 01/06/2011
• Est. Priority Date: 03/25/2008
• Status: Abandoned Application

• Current Assignee: Daicel Chemical Industries Limited
• Original Assignee: Daicel Chemical Industries Limited
• Inventors: Hayashi, Masaki
• Application Number:
  US12/920,429
• Publication Number:
  US 20110003093A1
• Time in Patent Office: Days
• US Class Current: 428/1.33
• CPC Class Codes: C08F 265/04 on to polymers of esters
• CPC Class Codes: C08F 265/06 Polymerisation of acrylate or methacrylate esters on to polymers thereof
• CPC Class Codes: C08F 290/06 Polymers provided for in subclass C08G
• CPC Class Codes: C08F 290/12 Polymers provided for in subclasses C08C or C08F
• CPC Class Codes: C08J 2333/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C08J 5/18 Manufacture of films or sheets
• CPC Class Codes: C08L 2205/02 containing two or more polymers of the same C08L -group
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 33/04 Homopolymers or copolymers of esters C08L43/04 takes precedence
• CPC Class Codes: C08L 33/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C08L 51/003 grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds C08L51/04, C08L51/06 take precedence
• CPC Class Codes: C09K 2323/035 Ester polymer, e.g. polycarbonate, polyacrylate or polyester
• CPC Class Codes: G02B 5/0221 the surface having an irregular structure G02B5/0226 takes precedence
• CPC Class Codes: G02B 5/0268 characterized by the fabrication or manufacturing method
• CPC Class Codes: G02B 5/0294 adapted to provide an additional optical effect, e.g. anti-reflection or filter
• CPC Class Codes: G02F 1/133504 Diffusing, scattering, diffracting elements associated to illuminating devices G02F1/133606
• CPC Class Codes: Y10T 428/24355 Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]

Abstract

An anti-glare film which can prevent reflected glare in a display and a whitening in a displayed black image and provide a contrasty image display in which black color appears more sharply is provided.

The anti-glare film is produced by applying a liquid composition containing a nonreactive (meth)acrylic resin having a weight-average molecular weight of 30,000 to 1,000,000, a (meth)acrylic resin having a weight-average molecular weight of 1,000 to 100,000 and a polymerizable group, a polyfunctional (meth)acrylate, and a solvent having a boiling point of not lower than 100° C., and producing convection along with volatilization of the solvent, wherein the anti-glare film has a ridge formed dispersively and in a random direction on a surface thereof, and the total area of the ridges is not more than 50% of a whole surface area of the anti-glare film. The ridge may have an average height of 0.05 to 10 μm and an average width of 0.1 to 30 μm. The ridge may have a depression extending along a longitudinal direction thereof.

Claims

1. A anti-glare film comprising a cured product of a nonreactive (meth)acrylic resin having a weight-average molecular weight of 30,000 to 1,000,000, a (meth)acrylic resin having a weight-average molecular weight of 1,000 to 100,000 and a polymerizable group, and a polyfunctional (meth)acrylate, the anti-glare film having a ridge formed dispersively and in a random direction on a surface thereof, wherein the total area of the ridges is not more than 50% of a whole surface area of the anti-glare film.

2. An anti-glare film according to claim 1, wherein the (meth)acrylic resin having the polymerizable group comprises a (meth)acrylic resin having a (meth)acryloyl group in a side chain thereof.

3. An anti-glare film according to claim 1, wherein the ridge has an average height of 0.05 to 10 μ

m and an average width of 0.1 to 30 μ

m.

4. An anti-glare film according to claim 1, wherein the ridge has a depression extending along a longitudinal direction thereof.

5. An anti-glare film according to claim 1, wherein the ridge is formed by

phase separation of at least two components selected from the group consisting of the nonreactive (meth)acrylic resin, the (meth)acrylic resin having the polymerizable group, and the polyfunctional (meth)acrylate due to spinodal decomposition and

production of convection.

10. An anti-glare sheet comprising

a transparent support and

an anti-glare film recited in claim 1 and formed on the support.

11. An anti-glare sheet according to claim 10, which further comprises a low-refraction-index layer formed on the anti-glare film.

12. An anti-glare sheet according to claim 10, which is incorporated in at least one display selected from the group consisting of a liquid crystal display, a cathode ray tube display, a plasma display, and a touch panel-equipped input device.

6. A process for producing an anti-glare film, which comprises

a drying step which comprises producing convection in a coated layer comprising a liquid composition containing a nonreactive (meth)acrylic resin having a weight-average molecular weight of 30,000 to 1,000,000, a (meth)acrylic resin having a weight-average molecular weight of 1,000 to 100,000 and a polymerizable group, a polyfunctional (meth)acrylate, and a first solvent having a boiling point of not lower than 100°

C. while volatilizing the first solvent, and

a curing step for curing the resulting dried coated layer.

7. A process according to claim 6, wherein the liquid composition further contains a second solvent having a different boiling point from that of the first solvent.

8. A process according to claim 6, wherein, in the drying step, at least two components of the nonreactive (meth)acrylic resin, the (meth)acrylic resin having the polymerizable group, and the polyfunctional (meth)acrylate are phase-separated by spinodal decomposition, and the production of convention in the liquid composition upheaves the surface of the coated layer to form a ridge.

9. A process according to claim 6, wherein, in the curing step, the coated layer is irradiated with at least one selected from the group consisting of an active energy ray and heat.