Anti-reflective coating composition comprising siloxane compound, and anti-reflective film using same

Patent metadata

Field	Value
Publication number	US-9657178-B2
Application number	US-201214418774-A
Country	US
Kind code	B2
Filing date	Dec 27, 2012
Priority date	Sep 4, 2012
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

The present invention relates to an anti-reflective coating composition, to an anti-reflective film using the same, and to a method for manufacturing the anti-reflective film, wherein the anti-reflective coating composition can form a coating layer having a low refractive index. More particularly, the present invention relates to an anti-reflective film and to a method for manufacturing same, wherein the reflectance of the anti-reflective film is minimized by using an anti-reflective coating composition comprising a siloxane compound prepared by reacting organosilane, which has a fluoroalkyl group and alkoxy silane, as a binder to form a coating layer. The anti-reflective film using the anti-reflective coating composition has excellent anti-reflective effects. Thus, it is expected that the present invention can be applied to various display devices such as those which include touch films.

First claim

The invention claimed is:

1. An anti-reflective coating composition comprising:
a binder formed by polymerization of a silane compound represented by Formula 1 and an organosilane compound represented by Formula 2,
wherein the organosilane compound represented by Formula 2 is present in an amount of 1 part by weight to 30 parts by weight, based on 100 parts by weight of the silane compound represented by Formula 1, and
wherein the binder has a weight average molecular weight from 12,000 to 18,000;

hollow silica particles; and
an acid catalyst configured to promote a surface treatment of the hollow silica by the binder,
wherein the acid catalyst is present in an amount of 0.1 part by weight to 20 parts by weight based on 100 parts by weight of the hollow silica particles,

wherein the coating composition has a pH in the range of 2 to 4
R 1 x Si(OR 2 ) 4-x   [Formula 1]

wherein R 1 is a C 1 to C 10 alkyl group, a C 6 to C 10 aryl group, or a C 3 to C 10 alkenyl group; R 2 is a C 1 to C 6 alkyl group; and x is an integer satisfying 0≦x≦3
R 3 y Si(OR 4 ) 4-y   [Formula 2]

wherein R 3 is a C 1 to C 12 fluoroalkyl group; R 4 is a C 1 to C 6 alkyl group; and y is an integer satisfying 0≦y≦3.

2. The coating composition according to claim 1 , wherein the silane compound represented by Formula 1 comprises at least one compound selected from among tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane, tetraisopropoxysilane, tetra-n-butoxysilane, tetra-sec-butoxysilane, tetra-tert-butoxysilane, trimethoxysilane, triethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, propyltrimethoxysilane, propyltriethoxysilane, isobutyltriethoxysilane, cyclohexyltrimethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, allyltrimethoxysilane, allyltriethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, diphenyldimethoxysilane, and diphenyldiethoxysilane.

3. The coating composition according to claim 1 , wherein the organosilane compound represented by Formula 2 comprises at least one compound selected from among trifluoromethyltrimethoxysilane, trifluoromethyltriethoxysilane, trifluoropropyltrimethoxysilane, trifluoropropyltriethoxysilane, nonafluorobutylethyltrimethoxysilane, nonafluorobutyl ethyltriethoxysilane, nonafluorohexyltrimethoxysilane, nonafluorohexyltriethoxysilane, tridecafluorooctyltrimethoxysilane, tridecafluorooctyltriethoxysilane, heptadecafluorodecyltrimethoxysilane, and heptadecafluorodecyltriethoxysilane.

4. The coating composition according to claim 1 , wherein x of Formula 1 is an integer of 0, 1 or 2.

5. The coating composition according to claim 1 , wherein R 3 of Formula 2 is a C 3 to C 5 fluoroalkyl group.

6. The coating composition according to claim 1 , wherein the hollow silica particles have a number average diameter from 1 nm to 1,000 nm.

7. The coating composition according to claim 1 , wherein the binder is present in an amount of 10 parts by weight to 120 parts by weight based on 100 parts by weight of the hollow silica particles.

8. An anti-reflective film comprising a low index of refraction layer formed by coating the coating composition according to claim 1 onto a surface of a base.

9. The anti-reflective film according to claim 8 , wherein the low index of refraction layer has an index of refraction from 1.20 to 1.25.

10. The anti-reflective film according to claim 8 , wherein the low index of refraction layer has a thickness of 1 nm to 1,000 nm.

11. The anti-reflective film according to claim 8 , wherein the anti-reflective film has a transmittance of 96% or more and a luminous reflectance from 0.5% to 1.0%.

12. A touch panel comprising the anti-reflective film according to claim 8 .

13. A method for manufacturing an anti-reflective film, comprising:
preparing a binder by polymerization of a silane compound represented by Formula 1 and an organosilane compound represented by Formula 2,
wherein the organosilane compound represented by Formula 2 is present in an amount of 1 part by weight to 30 parts by weight, based on 100 parts by weight of the silane compound represented by Formula 1, and
wherein the binder has a weight average molecular weight from 12,000 to 18,000;

preparing a coating composition comprising surface-treated hollow silica particles by adding the binder and an acid catalyst to the hollow silica,
wherein the acid catalyst is configured to promote a surface treatment of the hollow silica particle by the binder,
wherein the acid catalyst is present in an amount of 0.1 part by weight to 20 parts by weight, based on 100 parts by weight of the hollow silica particles;

coating the coating composition onto at least one surface of a base film; and
performing heat treatment of the coated coating composition,
wherein the acid catalyst is configured to adjust the coating composition to a pH value in the range of 2 to 4
R 1 x Si(OR 2 ) 4-x   [Formula 1]

wherein R 1 is a C 1 to C 10 alkyl group, a C 6 to C 10 aryl group, or a C 3 to C 10 alkenyl group; R 2 is a C 1 to C 6 alkyl group; and x is an integer satisfying 0≦x≦3
R 3 y Si(OR 4 ) 4-y   [Formula 2]

wherein R 3 is a C 1 to C 12 fluoroalkyl group; R 4 is a C 1 to C 6 alkyl group; and y is an integer satisfying 0≦y≦3.

14. The method according to claim 13 , wherein the coating composition comprises 10 parts by weight to 120 parts by weight of the binder, based on 100 parts by weight of the hollow silica particles.

15. The method according to claim 13 , wherein the coating composition is prepared by adding the binder and the acid catalyst to the hollow silica particles, followed by stirring at 20° C. to 40° C. for 5 hours to 50 hours.

16. The method according to claim 13 , wherein heat treatment is performed at a temperature of 50° C. to 200° C.

Assignees

• Lg Hausys Ltd

Inventors

• Cho Hong Kwan
• Hong Joo Hee
• Kim Won Kook

Classifications

• C08J7/0427

  with only one layer of a composition containing a polymer binder (with more layers C08J7/042) · CPC title

• C08J2483/04

  Polysiloxanes · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• G02B1/11

  Anti-reflection coatings · CPC title

• C09D183/06

  containing silicon bound to oxygen-containing groups (C09D183/12 takes precedence) · CPC title