Patent ID: 8029718

Claim:
A molding process for preparing a multi-layer rotational molded article comprising the step of adding to a rotational molder: a) an outer layer polymer powder, wherein said outer layer polymer powder comprises a blend of a polyolefin and a functional polyolefin; and b) an inner layer polymer powder selected from the group consisting of polyamide and polyvinylidene fluoride, wherein the inner layer polymer powder and the outer layer polymer powder are separated from each other by a release film having a thickness of from 1 to 8 mils, wherein said release film is a polyamide different from the inner layer polyamide when the inner layer is a polyamide, and said release film is a polyvinylidene fluoride different from the inner layer polyvinylidene fluoride when the inner layer is a polyvinylidene fluoride, and wherein said release film has a melting point at least 10° C. greater than that of the outer layer polymer powder, and at least 10° C. less than that of the inner layer.