Patent ID: 9670352
Date: 2017-06-06
CPC Classifications: B29C,B29D,C08J,C08L,C09K,G02B,G02F

Claim:
1. A retardation film with excellent optical transparency, consisting essentially of: a miscible blend resin of 1) an aliphatic acrylic copolymer resin that comprises 70 to 99.9 wt % of an alkyl methacrylate monomer and 0.1 to 30 wt % of a cyclohexyl methacrylate, and 2) a polycarbonate resin comprising an aromatic ring in a polymer main chain, wherein the alkyl methacrylate monomer has an alkyl group of 1 to 10 carbon atoms, wherein the content of 1) the aliphatic acrylic copolymer resin in the miscible blend resin is in the range of 90 to 99 wt % and the content of 2) the polycarbonate resin in the miscible blend resin is in the range of 1 to 10 wt %, wherein the in-plane retardation value (R wherein n wherein the film has been uniaxially or biaxially stretched at a stretching ratio(s) in a range of 5 to 300% at a temperature in a range of (Tg−20° C.) to (Tg+30° C.) when the glass transition temperature of the miscible blend resin is Tg.