Transparent resin composition

Patent metadata

Field	Value
Publication number	US-9168694-B2
Application number	US-201313942002-A
Country	US
Kind code	B2
Filing date	Jul 15, 2013
Priority date	Jan 8, 2008
Publication date	Oct 27, 2015
Grant date	Oct 27, 2015

Abstract

The present invention relates to a transparent resin composition which comprises (a) a (meth)acrylate based resin comprising one or more (meth)acrylate based derivatives; and (b) an aromatic based resin having a chain having the hydroxy group containing portion and an aromatic moiety.

First claim

The invention claimed is:

1. A method for manufacturing an optical film, the method comprising the steps of:
preparing a resin composition comprising
(a) a copolymer comprising 50 to 99% by weight of a (meth)acrylate based unit and 1 to 50% by weight of a cyclic based unit having a cyclic portion derived from N-cyclohexylmaleimide and
(b) an aromatic based resin having a chain having a hydroxy group containing portion and an aromatic moiety; and
shaping the optical film by using the resin composition,
wherein a haze value of the optical film is 2.5% or less,
the aromatic based resin includes a phenoxy based resin, and
the aromatic based resin includes at least one type of 5 to 10,000 units that are represented by Formula I:

wherein X is a divalent group comprising at least one benzene cycle and R is a straight- or branched-chained alkylene group having 1 to 6 carbon atoms.

2. The method for manufacturing an optical film as set forth in claim 1 , further comprising:
uniaxially or biaxially stretching the film.

3. A method for manufacturing an optical film, the method comprising the steps of:
preparing a resin composition comprising
(a) a copolymer comprising 50 to 99% by weight of a (meth)acrylate based unit and 1 to 50% by weight of a cyclic based unit having a cyclic portion derived from N-cyclohexylmaleimide and
(b) an aromatic based resin having a chain having a hydroxy group containing portion and an aromatic moiety; and
shaping the optical film by using the resin composition,
wherein the aromatic based resin includes 5 to 10,000 units that are represented by the following Formula 6:

wherein a transmittance of the resin composition is 70% or more, and a haze value of the optical film is 2.5% or less.

4. The method for manufacturing an optical film as set forth in claim 3 , further comprising:
uniaxially or biaxially stretching the film.

5. The method for manufacturing an optical film as set forth in claim 1 , wherein the (meth)acrylate based unit is selected from the group consisting of methyl methacrylate, methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl methacrylate, lauryl methacrylate and benzyl methacrylate.

6. The method for manufacturing an optical film as set forth in claim 1 , wherein the aromatic based resin has a number average molecular weight in the range of 1,500 to 2,000,000 g/mol.

7. The method for manufacturing an optical film as set forth in claim 1 , wherein X is a divalent group that is selected from the group consisting of the following Structural Formulas:

8. The method for manufacturing an optical film as set forth in claim 1 , wherein the aromatic based resin includes 5 to 10,000 units that are represented by the following Formula 6:

9. The method for manufacturing an optical film as set forth in claim 1 , wherein the resin composition has a single glass transition temperature.

10. The method for manufacturing an optical film as set forth in claim 1 , wherein the transmittance of the resin composition is 70% or more.

11. The method for manufacturing an optical film as set forth in claim 1 , wherein the transmittance of the resin composition is 90% or more.

12. The method for manufacturing an optical film as set forth in claim 1 , wherein the copolymer provides a retardation property in which a thickness refractive index is larger than an average in-plane refractive index to a film, and the aromatic based resin provides a retardation property in which a thickness refractive index is smaller than an average in-plane refractive index.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Dong-Ryul
• Jeong Boong-Goon
• Nam Dae-Woo
• Ko Myeong-Geun

Classifications

• B29C55/04 Primary

  uniaxial, e.g. oblique · CPC title

• B29C47/0021

  Operations & Transport · mapped topic

• C08G2650/56

  Polyhydroxyethers, e.g. phenoxy resins · CPC title

• C08L33/08 Primary

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C08L2666/24

  Graft or block copolymers according to groups C08L51/00, C08L53/00 or C08L55/02; Derivatives thereof · CPC title