COMPOSITE, ORIENTED, COEXTRUDED POLYESTER FILMS, PROCESS TO OBTAIN COMPOSITE, COMPLEX POLYESTER FILMS

摘要

PCT No. PCT/FR89/00086 Sec. 371 Date Sep. 10, 1990 Sec. 102(e) Date Sep. 10, 1990 PCT Filed Mar. 3, 1989 PCT Pub. No. WO89/08558 PCT Pub. Date Sep. 21, 1989.Oriented composite polyester films with improved adherence in respect of the various final coatings, comprising on at least one of their faces a primary adherence coating formed by co-extrusion of a common crystallizable polyester and of a copolyester with oxysulfonyl groups comprising, for 100 moles of recurrent units of dicarboxylic acid: a) from 78 to 93 moles of terephthalate units; b) from 2 to 5 moles of units derived from an aromatic diacid with one or a number of oxysulfonyl groups; c) from 5 to 17 moles of units derived from at least one alcanediacarboxylic acid comprising from 4 to 15 carbon atoms. These composite films have applications as a final coating support used in packaging, the graphic arts or metal coatings.