Patent ID: 7084944
Filing Date: 2006-08-01
Classification: C09K,G02B

Abstract:
1. An optical compensatory sheet comprising a cellulose acetate film which contains 100 weight parts of cellulose acetate having an acetic acid content of 59.0 to 61.5%, and 0.01 to 20 weight parts of an aromatic compound having at least two aromatic rings, wherein the cellulose acetate film is biaxially stretched, wherein the cellulose acetate film has an Re retardation value measured at 550 nm (Re550) in the range of 0 to 70 nm, an Rth retardation value measured at 550 nm (Rth550) in the range of 70 to 400 nm, and a thickness in the range of 10 to 70 μm, and wherein the cellulose acetate film has at least one surface having a surface energy of 55 to 75 mN/m.