Patent ID: 8313849
Filing Date: 2012-11-20
Classification: B32B,C08G,G11B,Y10T

Abstract:
1. A biaxially oriented laminated film comprising a film layer (A) made of an aromatic polyester (A) and a film layer (B) made of an aromatic polyester (B), wherein the content of a 6,6′-(alkylenedioxy)di-2-naphthoic acid component represented by the following formula (I) based on the total of all the acid components is less than 5 mol % in the aromatic polyester (A) and not less than 5 mol % and less than 50 mol % in the aromatic polyester (B); the thickness of the film layer (B) is 50 to 95% of the total thickness of the laminated film; and the peak temperature of tan δ on a high temperature side is 135° C. or higher when viscoelasticity is measured in the machine direction (in the formula (I), R is an alkylene group having 1 to 10 carbon atoms).