Patent ID: 7390558
Filing Date: 2008-06-24
Classification: B32B,Y10S,Y10T

Abstract:
1. A biaxially stretched aliphatic polyester film comprising at least two layers and having a shrinkage percentage at 120° C. of equal to or less than 10%: one of said two layers comprising an amorphous polylactic acid resin and a crystalline polylactic acid resin so as to satisfy the relation: (mass percentage of the amorphous polylactic acid resin)≧(mass percentage of the crystalline polylactic acid resin); the other of said two layers comprising an amorphous polylactic acid resin and a crystalline polylactic acid resin so as to satisfy the relation: (mass percentage of the amorphous polylactic acid resin)<(mass percentage of the crystalline polylactic acid resin).