Polyester film for high density magnetic recording tape.

摘要

A polyester film having a polyester (A) layer and at least one polyester (B) layer of at most 2.5 mu m in thickness containing at least 2.0 % by weight of particles and laminated on at least one surfaces of the polyester (A) layer, wherein a center line average roughness of a polyester (A) layer surface (Ra<A>), a center line average roughness of a polyester (B) layer surface (Ra<B>), a light transmittance of 900 nm wave length light (T900) and the peak count number on the polyester (B) layer surface are specified values, has excellent light screen property and surface property for a high density magnetic recording tape.