THERMOPLASTIC RESIN BASE FILM FOR MAGNETIC RECORDING MEDIUM

摘要

A polyester film for a magnetic recording medium, is comprised of a polyester film (1), a discontinuous film layer (2) or layers adhering closely to one surface or both the surfaces of the polyester film, and fine particles (3) present in the discontinuous film layer (2) or layers and on the or each surface of the discontinuous film layer (2) or layers, or on the exposed surface or surfaces of the polyester film (1) in the portions where the discontinuous film layer (2) or layers are not present. The discontinuous film layer (2) or layers have a thickness of not larger than 500 angstroms and are composed mainly of a water-soluble polymer.