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US 8,911,854 B2Granted
Optical film and a production method therefor
AssigneeLG Chem, Ltd.
InventorsByoung-II Kang, Chang-Hun Han, Chan-Hong Lee, Dae-Woo Lee, Jae-Bum Seo, Sang-Seop Kim
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Abstract
The present invention provides an optical film and s retardation film characterized in that each of them includes: an acrylic resin; and 20-65 parts by weight of at least two graft copolymers containing a conjugated diene-based rubber, based on 100 parts by weight of the acrylic resin, wherein at least two of the graft copolymers have different particle sizes. The present invention also provides a production method therefore.
Claims11
An optical film comprising:
- a) an acrylic resin;
- and
- b) 20-65 parts by weight of a graft copolymer having a core-shell structure in which a conjugated diene-based rubber constitutes a core and an acrylic resin constitutes shell, based on 100 parts by weight of the acrylic resin,
- the graft copolymer b) including a graft copolymer having a particle size of 50 to 100 nm and a graft copolymer having a particle size of 200 to 400 nm,
- the acrylic resin a) including a copolymer of an acrylic monomer, an aromatic vinyl monomer and an acrylonitrile monomer;
- a copolymer of an acrylic monomer, an aromatic vinyl monomer and an acid anhydride;
- and a copolymer of an acrylic monomer, an aromatic vinyl monomer, an acrylonitrile monomer and an acid anhydride;
- or a combination thereof, and
- the conjugated diene-based rubber including ethylene-propylene-diene rubber, butadiene rubber, or a combination thereof,
- wherein the weight ratio of the conjugated diene-based rubber to the acrylic resin in the graft copolymer b) is 15-45:85-55, and
- wherein the acrylic resin in the graft copolymer b) is a copolymer of an acrylic monomer, an aromatic vinyl monomer and an acrylonitrile monomer.
8 more elements
A method of manufacturing an optical film, comprising:
- preparing a resin composition including a) an acrylic resin;
- and b) 20-65 parts by weight of a graft copolymer having a core-shell structure in which a conjugated diene-based rubber constitutes a core and an acrylic resin constitutes shell, based on 100 parts by weight of the acrylic resin a);
- and
- forming a film by using the resin composition,
- the graft copolymer b) including a graft copolymer having a particle size of 50 to 100 nm and a graft copolymer having a particle size of 200 to 400 nm,
- the acrylic resin a) including a copolymer of an acrylic monomer, an aromatic vinyl monomer and an acrylonitrile monomer;
- a copolymer of an acrylic monomer, an aromatic vinyl monomer and an acid anhydride;
- and a copolymer of an acrylic monomer, an aromatic vinyl monomer, an acrylonitrile monomer and an acid anhydride;
- or a combination thereof, and
- the conjugated diene-based rubber including ethylene-propylene-diene rubber, butadiene rubber, or a combination thereof,
- wherein the weight ratio of the conjugated diene-based rubber to the acrylic resin in the graft copolymer b) is 15-45:85-55, and
- wherein the acrylic resin in the graft copolymer b) is copolymer of an acrylic monomer, an aromatic vinyl monomer and an acrylonitrile monomer.
9 more elements
Dependencies are inferred from the claim text.