Patent ID: 6162527
Filing Date: 2000-12-19
Classification: C08J,Y10S,Y10T

Abstract:
A biaxially oriented polyester film which consists of a polyester composition comprising:a) 0.0005 to 0.03% by weight of crosslinked polymer particles having an average particle diameter d.sub.A of 0.8 to 1.6 .mu.m,b) 0.1 to 0.8% by weight of inert particles having an average particle diameter d.sub.B of 0.4 to 0.8 .mu.m, andc) 0.05 to 1.0% by weight of inert inorganic particles having an average particle diameter d.sub.C of 0.01 to 0.3 .mu.m and a Moh's hardness of not less than 7, and which satisfies the following equations (1) and (2):1.5.ltoreq.d.sub.A /d.sub.B .ltoreq.3 (1)wherein d.sub.A and d.sub.B are defined as above,SRz/SRa.gtoreq.20 (2)wherein SRz is a three dimensional 10-points average roughness of a film surface and SRa us a three dimensional center plane average roughness of a film surface,wherein the inert inorganic particles having an average particle diameter d.sub.C are agglomerates of particles having an average agglomeration rate of 2 to 20, andthe biaxially oriented polyester film has a film thickness of 3 to 25 .mu.m.