Patent ID: 7691477

Claim:
A coextruded multi-layer article comprising a base layer that contains at least one thermoplastic resin and a coextruded protective coating layer consisting of a thermoplastic (co)polyformal of formulae (2a), (2b), (2c) and/or (2d): wherein R 1 and R 2 are, independently of one another, H, a linear or branched C 1 -C 18 alkyl- or alkoxy group, halogen or an optionally substituted aryl or aralkyl group; X is a single bond, a C 1 -C 6 alkylene group, a C 2 -C 5 alkylidene, a C 5 -C 6 cycloalkylidene group, optionally substituted with C 1 -C 6 alkyl, or a C 6 -C 12 arylene group, wherein said C 6 -C 12 arylene group is optionally condensed with further aromatic rings containing heteroatoms; p is an integer from 1 to 1500; q is a fractional number z/p; r is a fractional number (p-z)/p; z is an integer from 0 to p, and wherein said thermoplastic polyformal of formulae (2a) and/or (2b) and / or a copolyformal of formula (2c) and/or (2d) optionally contains from 0.05 to 2 mol % of branching agents; and wherein said thermoplastic polyformal of formulae (2a) and/or (2b) and/or a copolyformal of formula (2c) and/or (2d) is chain stopped with phenols; or a blend of said thermoplastic (co)polyformals with (co)polycarbonate and/or (co)polyesters, and optionally one or more additives selected from the group consisting of UV absorbers, stabilizers, mold release agents, esters or partial esters of mono- to hexavalent alcohols, organic dyes, inorganic colour pigments, fluorescent, dyes optical brighteners and antistatics.