Injection molding method for modifying the surface of a nonpolar polymer molding and a multilayer film suitable for this method

摘要

Injection molding process for modifying a surface of an apolar polymer molded body (5) comprising a polymer (4), comprises back molding the multi-layer film (1) with at least a first apolar layer (2) and a second layer (3) with at least one surface property different from the first layer, where the first non-polar layer of the polymer is facing the polymer molded body. Independent claims are also included for: (1) the multilayer film comprising at least a first apolar layer and a second layer, where the apolar layer exhibits a surface tension of less than 35 mN/m and the second layer exhibits a surface tension of more than 37 mN/m; and (2) a polymer molded part produced by the above mentioned injection molding process.