Optical film comprising primer layer containing polyester resin and polarizing plate using same

Patent metadata

Field	Value
Publication number	US-2016237284-A1
Application number	US-201415025454-A
Country	US
Kind code	A1
Filing date	Sep 30, 2014
Priority date	Sep 30, 2013
Publication date	Aug 18, 2016
Grant date	—

Abstract

The present invention relates to an optical film including: a base material film; and a primer layer containing a polyester resin and water-dispersible minute particulates on at least one surface of the base material film and having a refractive index difference of 0.03 or less from the base material film, in which the polyester resin includes polyester glycol formed by a reaction of polybasic acid including an aromatic carboxylic acid compound and an aliphatic carboxylic acid compound at a mole ratio of 1:9 to 9:1 and polyol, adhesion force between the optical film and a functional coating layer is excellent, and a rainbow phenomenon is reduced and an optical property is excellent due to a small refractive index difference.

First claim

1 . An optical film comprising:
a base material film; and a primer layer containing a polyester resin and water-dispersible minute particulates on at least one surface of the base material film and having a refractive index difference of 0.03 or less from the base material film, wherein the polyester resin includes polyester glycol formed by a reaction of polyol and polybasic acid including an aromatic carboxylic acid compound and an aliphatic carboxylic acid compound at a mole ratio of 1:9 to 9:1.

2 . The optical film of claim 1 , wherein the mole ratio of the aromatic carboxylic acid compound and the aliphatic carboxylic acid compound is 2:8 to 8:2.

3 . The optical film of claim 1 , wherein the aromatic carboxylic acid compound is at least one kind selected from the group consisting of ortho-phthalic acid, isophthalic acid, terephthalic acid, 1,4-naphthalenedicarboxylic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, biphenyldicarboxylic acid, and tetrahydrophthalic acid.

4 . The optical film of claim 1 , wherein the aliphatic carboxylic acid compound is at least one kind selected from the group consisting of chain aliphatic carboxylic acid such as oxalic acid, succinic acid, malonic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, linoleic acid, maleic acid, fumaric acid, mesaconic acid, and itaconic acid; and cyclic aliphatic carboxylic acid such as hexahydrophthalic acid, tetrahydrophthalic acid, 1,3-cyclohexanedicarboxylic acid, and 1,4-cyclohexanedicarboxylic acid.

5 . The optical film of claim 1 , wherein the polyester resin includes a polyester acryl resin formed by further copolymerizing an acryl-based monomer with polyester glycol formed by the reaction of the polybasic acid and polyol.

6 . The optical film of claim 5 , wherein polyester glycol and the acryl-based monomer are copolymerized at a weight ratio of 2:8 to 7:3.

7 . The optical film of claim 1 , wherein the primer layer further includes an acryl-based compound.

8 . The optical film of claim 1 , wherein a refractive index of the base material film is 1.45 to 1.65.

9 . The optical film of claim 1 , wherein the base material film is an acryl-based film.

10 . The optical film of claim 1 , wherein a functional coating layer is laminated on the primer layer.

11 . The optical film of claim 1 , wherein the optical film is a protection film for a polarizing plate.

12 . A polarizing plate comprising:
a polarizer; and the optical film of claim 1 on at least one surface of the polarizer.

13 . An image display device comprising:
the polarizing plate of claim 12 .

Assignees

• Lg Chemical Ltd

Inventors

• Shim Hwa-Sub
• Park Jun-Wuk
• Lim Yi-Rang
• Kim Kyoung-Won

Classifications

• B32B2307/418

  Refractive · CPC title

• B32B2551/00

  Optical elements · CPC title

• G02B5/3025

  Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state (G02B5/3008, G02B5/3016 take precedence) · CPC title

• B32B2255/10

  on synthetic resin layer or on natural or synthetic rubber layer · CPC title

• C09D167/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds (C09D167/06 takes precedence) · CPC title