ANTI-REFLECTION FILM AND METHOD FOR MANUFACTURING THE SAME

• US 20130078440A1
• Filed: 07/08/2011
• Published: 03/28/2013
• Est. Priority Date: 07/08/2010
• Status: Active Grant

• Current Assignee: LG Chem Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Kim, Heon, Chang, Yeong-Rae, Jung, Soon-Hwa, Park, Jin-Young, Kim, Boo-Kyung
• Granted Patent: US 9,127,171 B2
• Time in Patent Office: Days
• US Class Current: 428/212
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C08F 220/22 Esters containing halogen
• CPC Class Codes: C08F 222/106 Esters of polycondensation macromers
• CPC Class Codes: C09D 5/006 Anti-reflective coatings
• CPC Class Codes: C09D 7/42 Gloss-reducing agents
• CPC Class Codes: C09D 7/61 inorganic
• CPC Class Codes: C09D 7/62 modified by treatment with other compounds
• CPC Class Codes: C09D 7/65 macromolecular C09D7/41-C09D7/48 take precedence
• CPC Class Codes: C09D 7/70 characterised by shape, e.g. fibres, flakes or microspheres
• CPC Class Codes: G02B 1/11 Anti-reflection coatings
• CPC Class Codes: G02B 1/111 using layers comprising organic materials
• CPC Class Codes: G02B 1/115 Multilayers
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree

Abstract

Disclosed is an anti-reflection film comprising a high refractive index layer comprising a first binder including a crosslinked polymer of a multifunctional (meth)acrylate compound, and nano silica particles dispersed in the first binder; and a low refractive index layer laminated on the high refractive index layer, and comprising a second binder including a crosslinked copolymer of a multifunctional (meth)acrylate compound and a fluorine-based (meth)acrylate compound, and hollow silica particles and hollow silica particles coated with a fluorine-based compound on the surface, which are dispersed in the second binder. Also disclosed is a method for manufacturing the anti-reflection film using a composition that is separated into at least two layers by phase separation after single layer coating by a more simplified process.

Claims

1. An anti-reflection film comprising

a high refractive index layer comprising a first binder including a crosslinked polymer of a multifunctional (meth)acrylate compound, and nano silica particles dispersed in the first binder;

and

a low refractive index layer laminated on the high refractive index layer, and comprising a second binder including a crosslinked copolymer of a multifunctional (meth)acrylate compound and a fluorine-based (meth)acrylate compound, and hollow silica particles and hollow silica particles coated with a fluorine-based compound on the surface, which are dispersed in the second binder.

2. The anti-reflection film according to claim 1, wherein the hollow silica particles coated with a fluorine-based compound on the surface in the low refractive index layer has a distribution gradient increasing toward a direction away from the high refractive index layer.

3. The anti-reflection film according to claim 1, wherein the high refractive index layer has a refractive index of 1.5 to 1.58, and the low refractive index has a refractive index of 1.1 to 1.45.

4. The anti-reflection film according to claim 1, wherein the fluorine-based compound coated on the hollow silica particles has a refractive index of 1.3˜

1.4 and surface tension of 10˜

25 mN/m.

5. The anti-reflection film according to claim 1, wherein the fluorine-based compound coated on the hollow silica particles is a fluorine-containing alkoxysilane compound.

6. The anti-reflection film according to claim 1, wherein the fluorine-based compound coated on the hollow silica particles is at least one selected from the group consisting of tridecafluorooctyl triethoxy silane, heptadecafluorodecyl trimethoxy silane, and heptadecaflouorodecyl triisopropoxy silane.

7. The anti-reflection film according to claim 1, wherein the fluorine-based (meth)acrylate compound is at least one selected from the group consisting of the following Chemical Formula 1 to 5:

8. The anti-reflection film according to claim 1, wherein the nano silica particles in the high refractive index layer have a number average particle diameter of 100 nm or less.

9. The anti-reflection film according to claim 1, wherein the hollow silica particles and the hollow silica particles coated with the fluorine-based compound in the low refractive index layer respectively have a number average particle diameter of 1 to 200 nm.

10. The anti-reflection film according to claim 1, wherein the weight ratio of the hollow silica particles coated with the fluorine-based compound to the hollow silica particles in the low refractive index layer is 1:

0.1˜

20.

11. A method for manufacturing an anti-reflection film comprising

preparing a composition comprising a multifunctional (meth)acrylate compound, a fluorine-based (meth)acrylate compound, nano silica particles, hollow silica particles, hollow silica particles coated with a fluorine-based compound, a solvent, and an initiator;

coating the composition on at least one side of a base film;

drying the coated composition; and

curing the dried composition.

12. The method according to claim 11, wherein the composition comprises,

based on 100 parts by weight of the multifunctional (meth)acrylate compound,

1 to 30 parts by weight of the fluorine-based (meth)acrylate compound;

1 to 30 parts by weight of the nano silica particles;

1 to 20 parts by weight of the hollow silica particles;

1 to 60 parts by weight of the hollow silica particles coated with a fluorine-based compound;

100 to 500 parts by weight of the solvent; and

1 to 20 parts by weight of the initiator.

13. The method according to claim 11, the drying is conducted at a temperature of form 5 to 150°

C. for 0.1 to 60 minutes.

14. The method according to claim 11, wherein the curing is conducted after the composition coated on the base film is phase-separated into at least one layer according to the distribution gradient of the hollow silica particles coated with a fluorine-based compound.

15. The method according to claim 11, wherein the curing is conducted by heat curing by heat treatment at a temperature of from 20 to 150°

C. for 1 to 100 minutes, or by UV curing by UV irradiation at a UV irradiation amount of 0.1 to 2 J/cm² for 1 to 600 seconds.