IMPROVED-ADHERENCE COMPOSITE POLYESTER FILMS AND PROCESS FOR THEIR PRODUCTION

摘要

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 crystallisable 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.