Patent ID: 6338890
Filing Date: 2002-01-15
Classification: B32B,G11B,Y10S,Y10T

Abstract:
A biaxially oriented laminated polyester film comprising:(A) a first polyester layer which comprises a first aromatic polyester containing inert fine particles and has a center plane average surface roughness of an exposed surface of 4 to 15 nm, the inert fine particles consisting of first inert fine particles having an average particle diameter of 0.2 to 0.4 &mgr;m and second inert fine particles having an average particle diameter which is 0.1 to 0.3 &mgr;m smaller than that of the first inert fine particles, and the contents of the first inert fine particles and the second inert fine particles being 0.05 to 0.4 wt % and 0.1 to 0.8 wt % based on the first aromatic polyester, respectively; and (B) a second polyester layer comprising a second aromatic polyester which may contain inert fine particles and having a center plane average surface roughness of an exposed surface of 0.5 to 3.5 nm, the inert fine particles being third inert fine particles having an average particle diameter of 0.05 to 0.2 &mgr;m and the content of the third inert fine particles being 0 to 0.1 wt % based on the second aromatic polyester, (C) the friction coefficient between the first polyester layer and the second polyester layer being 0.5 or less.