Coextruded, at least two layer, transparent biaxially orientated polyester film, useful for printing or metallization and for the packaging of foodstuffs, has a layer of a cross-linked acrylic coating applied as an aqueous dispersion

摘要

A coextruded, at least two layer, transparent biaxially orientated polyester film has a layer of a cross-linked acrylic coating applied as an aqueous dispersion. A coextruded, at least two layer, transparent biaxially orientated polyester film (I) comprising a base layer (B) comprising at least 80 wt.% of a thermoplastic polyester, a coextruded covering layer (A) on (B) and at least one acrylic coating (D) is characterized in that: (1) the base layer (B) contains only filler that is incorporated by regeneration of cut material; (2) the covering layer (A) contains 500-2500 ppm filler; (3) the filler comprises SiO2 having a particle diameter d50 of 10-60 nm and/or 1.0-5 mum; and (4) at least one of the film surfaces has a layer of a cross-linked acrylic coating (D) applied as an aqueous dispersion. An Independent claim is included for a process for the production of the film (I) by production of a multilayer film comprising base layer (B), covering layer (A) and optionally layer (C) by coextrusion, biaxial stretching of the film in the longitudinal and transverse directions, coating of the film with the acrylic cross-linkable coating (D), preferably after the first two steps and thermofixing of the stretched film.