Biaxially-oriented polyester film for use in food and other packaging has a base layer containing poly(m-xylene-adipamide) and a barrier layer containing a maleic acid/acrylic acid copolymer

摘要

Polyester films comprising a base layer (B) having on at least one side a barrier layer (D) are such that (1) layer (B) contains poly(m-xylene- adipamide); and (2) layer (D) consists of a blend of a film-forming material and a maleic acid/acrylic acid copolymer. An Independent claim is also included for production of the films by (co)extrusion of a film, longitudinal stretching, coating with barrier layer (D), transverse stretching and heat fixing.