Patent ID: 7588807
Filing Date: 2009-09-15
Classification: C08J,C08L,C09K,G02B,G02F

Abstract:
1. A retardation film comprising a stretched polymer film containing a styrene-based resin and a polycarbonate-based resin, which satisfies the following expressions (1) and (2): (in the expressions (1) and (2) , Re [590] and Rth[590] respectively represent in-plane retardation and thickness direction retardation values of the film measured by using light of a wavelength of 590 nm at 23° C.); wherein a content of the styrene-based resin is 10 to 40 parts by weight with respect to 100 parts by weight of a total solid content; and wherein an absolute value of photoelastic coefficient of the retardation film measured by using light of a wavelength of 590 nm at 23° C. is 2.0×10