Resin composition, optical film formed using the same, polarizing plate and liquid crystal display device including the same

Patent metadata

Field	Value
Publication number	US-9323102-B2
Application number	US-201314035218-A
Country	US
Kind code	B2
Filing date	Sep 24, 2013
Priority date	Jun 1, 2012
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

Abstract

There are provided a resin composition and an optical film using the same. The resin composition includes a copolymer (A) formed by polymerizing a (meth)acryloyl morpholine-based monomer (a), a maleimide-based monomer (b), and an alkyl(meth)acrylate-based monomer (c), and the optical film is manufactured using the same. The resin composition may provide a film having excellent optical properties and optical transparency, reduced haze, excellent mechanical strength, a relatively low level of thermal expansion coefficient leading to a relatively small change in a dimension, and a relatively low level of alteration in a retardation value due to external stress.

First claim

What is claimed is:

1. A resin composition comprising: a copolymer (A) formed by polymerizing a (meth)acryloyl morpholine-based monomer (a), a maleimide-based monomer (b), and at least one of an alkyl(meth)acrylate-based monomer, a hydroxylethylmethacrylate or a cyclohexylmethacrylate (c), and further comprising polycarbonate (B).

2. The resin composition of claim 1 , wherein the copolymer (A) includes the (meth)acryloyl morpholine-based monomer (a) in an amount of 0.5 to 40 parts by weight, the maleimide-based monomer (b) in an amount of 1 to 15 parts by weight, and the alkyl(meth)acrylate-based monomer (c) in an amount of 50 to 98 parts by weight, with respect to 100 parts by weight of the copolymer.

3. The resin composition of claim 1 , wherein the (meth)acryloyl morpholine-based monomer is at one selected from a group consisting of methacryloyl morpholine, acryloyl morpholine and phenyl acryloyl morpholine.

4. The resin composition of claim 1 , wherein the maleimide-based monomer is at least one selected from a group consisting of methylmaleimide, ethylmaleimide, propylmaleimide, isopropyl maleimide, butylmaleimide, allylmaleimide, benzylmaleimide, cyclohexylmaleimide, phenylmaleimide, nitrophenyl maleimide, hydroxymaleimide, methoxymaleimide, ethoxymaleimide, monochlorophenyl maleimide, dichlorophenyl maleimide, monomethylphenyl maleimide, dimethyl phenyl maleimide, and ethylmethylphenyl maleimide.

5. The resin composition of claim 1 , wherein the alkyl(meth)acrylate-based monomer is at least one selected from a group consisting of methylacrylate, ethylacrylate, methyl methacrylate, ethyl methacrylate, and methyl ethacrylate, hydroxyethyl methacrylate and cyclohexyl methacrylate.

6. The resin composition of claim 1 , wherein the copolymer (A) further includes a styrene-based monomer, as a comonomer.

7. The resin composition of claim 6 , wherein the styrene-based monomer has the content of 0.1 to 5.0 parts by weight with respect to 100 parts by weight of the copolymer.

8. The resin composition of claim 6 , wherein the styrene-based monomer is at least one selected from a group consisting of styrene, α-methylstyrene, p-bromostyrene, p-methylstyrene and p-chlorostyrene.

9. The resin composition of claim 1 , wherein the content of the polycarbonate (B) is 0.5 to 5 parts by weight with respect to the total amount of 100 parts by weight of the resin composition.

10. An optical film manufactured using the resin composition of claims 1 .

11. The optical film of claim 10 , wherein the optical film has a thermal expansion coefficient of 50 to 80 ppm/° C.

12. The optical film of claim 10 , wherein an absolute value of retardation Rin in a surface direction of the orientation film defined by the following
[Expression 1], and an absolute value of retardation Rth in a thickness direction thereof defined by the following [Expression 2] are respectively 5 nm or lower,
Rin =( nx−ny )× d,   [Expression 1]

Rth =( nz−ny )× d   [Expression 2]

wherein in expressions 1 and 2 above, nx refers to the highest refractive index among refractive indexes in the surface direction of the optical film, ny refers to a refractive index in a direction perpendicular to a direction of nx among refractive indexes in the surface direction of the optical film, nz refers to a refractive index in the thickness direction, and d refers to a thickness of the film.

13. The optical film of claim 12 , wherein the optical film is a protective film for a polarizer.

14. A polarizing plate comprising:
a polarizer; and
the optical film of claim 10 , disposed on at least one surface of the polarizer.

15. A liquid crystal display device comprising the polarizing plate of claim 14 .

Assignees

• Lg Chemical Ltd

Inventors

• Um Jun-Geun
• Lee Nam-Jeong

Classifications

• C08J2339/04

  Homopolymers or copolymers of monomers containing heterocyclic rings having nitrogen as ring member · CPC title

• C08F226/06

  by a heterocyclic ring containing nitrogen · CPC title

• C08L39/04

  Homopolymers or copolymers of monomers containing heterocyclic rings having nitrogen as ring member · CPC title

• C08J2333/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title

• G02B1/04

  made of organic materials, e.g. plastics (G02B1/08 takes precedence) · CPC title