COMPOSITE POLYESTER FILMS AS FINAL COATING SUPPORTS

摘要

PCT No. PCT/FR90/00146 Sec. 371 Date Dec. 27, 1990 Sec. 102(e) Date Dec. 27, 1990 PCT Filed May 2, 1990 PCT Pub. No. WO90/10666 PCT Pub. Date Sep. 20, 1990.The invention relates to orientated composite polyester films carrying, on at least one face, a coating intended to improve the slip properties, consisting of a graft polymer comprising a backbone derived from a polyester containing sulphonyloxy groups and grafts of polymer units derived from at least one ethylenically unsaturated monomer and at least one ethylenically unsaturated organosiloxane. The composite polyester films according to the invention are very particularly suitable for the production of magnetic tapes.