Resin composition for optical film and optical film using the same

Patent metadata

Field	Value
Publication number	US-9494712-B2
Application number	US-201213989377-A
Country	US
Kind code	B2
Filing date	Jan 30, 2012
Priority date	Apr 13, 2011
Publication date	Nov 15, 2016
Grant date	Nov 15, 2016

Abstract

Provided are a resin composition for an optical film including an alkyl(meth)acrylate unit, a benzyl(meth)acrylate unit, a (meth)acrylic acid unit, and a unit expressed by Chemical Formula I, an optical film, a polarizing plate, and an image display device using the resin composition.

First claim

The invention claimed is:

1. A resin composition for an optical film comprising:
about 55 to 94 parts by weight of the methyl methacrylate unit;
about 2 to 20 parts by weight of the benzyl methacrylate unit;
about 1 to 10 parts by weight of the methacrylic acid unit; and
about 3 to 15 parts by weight of the glutaric acid anhydride unit,
wherein the resin composition is a four-component copolymer resin in which each unit component is included in a repeating unit form, and
wherein the resin composition for an optical film has a yellow index range of about 0.3 to about 2.0.

2. The resin composition for an optical film of claim 1 , wherein a content of the methacrylic acid unit is in a range of about 1 to 2 parts by weight.

3. The resin composition for an optical film of claim 1 , wherein the resin composition for an optical film has a glass transition temperature range of about 120° C. to about 500° C.

4. The resin composition for an optical film of claim 1 , wherein the resin composition for an optical film has a transparency range of about 0.1% to about 3%.

5. An optical film comprising the resin composition for an optical film of claim 1 .

6. The optical film of claim 5 , wherein the optical film has an in-plane retardation value (R in ) expressed by the following Mathematical Equation 1 ranging from about 0 nm to about 10 nm and a thickness retardation value R th expressed by the following Mathematical Equation 2 ranging from about −5 nm to about 10 nm at a wavelength of about 580 nm,
R in =( n x −n y )× d   [Mathematical Equation 1]

R th =( n z −n y )× d   [Mathematical Equation 2]

where n x is an in-plane refractive index of the film in a direction having a largest refractive index, n y is an in-plane refractive index of the film in a direction perpendicular to the n x direction, n z is a thickness refractive index, and d is a thickness of the film.

7. The optical film of claim 2 , wherein the optical film has a thermal expansion coefficient range of about 50 ppm/° C. to 70 ppm/° C.

8. The optical film of claim 5 , wherein the optical film has an in-plane retardation value (R in ) expressed by the following Mathematical Equation 1 ranging from about 0 nm to about 10 nm, a thickness retardation value (R th ) expressed by the following Mathematical Equation 2 ranging from about −5 nm to about 10 nm at a wavelength of about 580 nm, and a thermal expansion coefficient range of about 50 ppm/° C. to 70 ppm/° C.,
R in =( n x −n y )× d   [Mathematical Equation 1]

R th =( n z −n y )× d   [Mathematical Equation 2]

where n x is an in-plane refractive index of the film in a direction having a largest refractive index, n y is an in-plane refractive index of the film in a direction perpendicular to the n x direction, n z is a thickness refractive index, and d is a thickness of the film.

9. The optical film of claim 5 , wherein the optical film is a polarizing plate protective film.

10. A polarizing plate comprising:
a polarizer; and
the optical film of claim 6 adhered to at least one side of the polarizer.

11. A polarizing plate comprising:
the optical film of claim 5 ,
wherein a bending angle of the polarizing plate is about 150 degrees or less after left standing at 25° C. and 50% RH for 24 hours.

12. An image display device comprising the optical film of claim 5 .

Assignees

• Seo Jae-Bum
• Han Chang-Hun
• Lee Dae-Woo
• Park Jung-Tae
• Choi Eun-Jung
• Kang Byoung-Il
• Kim Joon-Sik
• Kim Su-Kyung
• Sung Da-Eun
• Lee Nam-Jeong
• Kim Beom-Suk
• Sung Yu-Taek
• Lg Chemical Ltd

Inventors

• Seo Jae-Bum
• Han Chang-Hun
• Lee Dae-Woo
• Park Jung-Tae
• Choi Eun-Jung
• Kang Byoung-Il
• Kim Joon-Sik
• Kim Su-Kyung
• Sung Da-Eun
• Lee Nam-Jeong
• Kim Beom-Suk
• Sung Yu-Taek

Classifications

• G02B5/3083

  Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001) · CPC title

• G02B1/04 Primary

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

• C08L33/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title

• C08L33/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• G02B5/30

  Polarising elements (light-modulating devices with active elements G02F1/00) · CPC title