PROCESSO PARA A OBTENCAO DE PELICULAS DE POLIESTER COMPOSITAS ESPESSAS ORIENTADAS COM ADERENCIA MELHORADA,PELICULAS OBTIDAS A PARTIR DESTE PROCESSO E PELICULAS ORIENTADAS COMPLEXAS OBTIDAS

摘要

Thick, composite polyester films, well adapted as base films, e.g., for the graphic arts, are comprised of a crystalline or semicrystalline polyester film substrate (A) having a thickness of at least 40 micrometers, said film substrate (A) having a coating, e.g., a coextrudate, of a sulfonated copolyester adhesion primer on at least one of the face surfaces thereof, and said sulfonated copolyester comprising at least 80 mol % of terephthalate recurring units and from 3 to 10 mol % of oxysulfonylate recurring units.