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US 9,315,639 B2Granted
Optical films, phase difference films, and LCD comprising the same
AssigneeLG Chem, Ltd.
InventorsHee-Jung Kim, Dong-Ryul Kim, Boong-Goon Jeong, Ju-Eun Cha, Young-Whan Park, Dae-Woo Nam
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Abstract
The present invention relates to an optical film that includes a graft copolymer that includes two types or more of (meth)acryl based resins that have different glass transition temperatures, a retardation film, a method of producing the same, and a polarizing plate and a liquid crystal display device that include the optical film or the retardation film.
Claims12
An optical film consisting essentially of:
- a graft copolymer including one type of (meth)acryl based resins of which the glass transition temperature is less than 0° C. and one type of (meth)acryl based resins of which the glass transition temperature is 0° C. or more, and
- a resin that has styrene or derivatives thereof,
- wherein the (meth)acryl based resins of which the glass transition temperature is less than 0° C. comprises (meth)acryl based monomer and (meth)acrylic acid ester based monomer having a functional group,
- wherein the amount of the (meth)acrylic acid ester based monomer having a functional group is in the range of 0.1 to 50 mole %,
- wherein the graft copolymer has a structure in which the (meth)acryl based resins of which the glass transition temperature is less than 0° C. form a main chain and the (meth)acryl based resins of which the glass transition temperature is 0° C. or more form a side chain,
- wherein the side chain is introduced into the main chain via a functional group capable of reacting with a radical, and
- wherein the functional group capable of reacting with a radical is a —SH group.
4 more elements
An optical film consisting essentially of:
- a graft copolymer including one type of (meth)acryl based resins of which the glass transition temperature is less than 0° C. and one type of (meth)acryl based resins of which the glass transition temperature is 0° C. or more, and
- a resin that has styrene or derivatives thereof,
- wherein the (meth)acryl based resins of which the glass transition temperature is less than 0° C. comprises (meth)acryl based monomer and (meth)acrylic acid ester based monomer having a functional group,
- wherein the amount of the (meth)acrylic acid ester based monomer having a functional group is in the range of 0.1 to 50 mole %,
- wherein the graft copolymer has a structure in which the (meth)acryl based resins of which the glass transition temperature is less than 0° C. form a main chain and the (meth)acryl based resins of which the glass transition temperature is 0° C. or more form a side chain, and
- wherein the structure of the graft copolymer comprises only one main chain.
3 more elements
Dependencies are inferred from the claim text.