SINGLE- OR MULTI-LAYER FOIL OF LIMITED GAS PERMEABILITY, PROCESS AND POLYMER MIXTURE FOR PRODUCING SAME, THERMOPLASTICALLY PROCESSIBLE STARCH AND PROCESS FOR PRODUCING SAME

摘要

A single-layer or multiple-layer foil of substantially reduced gas-permeability comprises at least one layer which consists, at least in part, of substantially thermoplastically processable starch. In order that this singlelayer or multiple-layer foil is at least approximately insensitive to moisture it is proposed that at least one layer comprises furthermore at least one hydrophobic polymer, such as a polyolefin, which is mixed with the starch upon the production of said at least one layer, and/or that the starch is at least partially cross-linked on the surface of said at least one layer and/or that said at least one layer is covered by at least one additional layer which is at least approximately insensitive to moisture.