Patent ID: 7175917
Filing Date: 2007-02-13
Classification: C08J,C08L,Y10T

Abstract:
1. A window for an outlook window envelope, comprising a biaxially oriented film comprising a polylactic acid resin, which has a storage modulus E′ at 80° C., in at least one of a longitudinal direction (MD direction) and a width direction (TD direction) of the film, of from 10 MPa to 3,000 MPa, as determined by a test method for temperature dependency of dynamic viscoelasticity in accordance with JIS K7198 (method A); a heat shrinkage of not higher than 10%, upon heating at 80° C. for 10 seconds; a tear strength in the width direction (TD direction) of 10 to 200 mN, as determined in accordance with JIS K7128 (method B); and said film is drawn at a ratio of 5.2–7 in the width direction (TD direction).