Polyurethane-polyanhydride subbing layer for photo sensitive elements

摘要

Polymeric subbing compositions for polyester photobase, especially polyethylene terephthalate films, comprising, a mixture of a polyurethane resin with a homopolymer or copolymer or a mixture of a homopolymer and a copolymer of an unsaturated cyclic carboxylic acid anhydride, preferably maleic anhydride or itaconic anhydride, in which the mixture contains up to 75% by weight of the anhydride polymer.