Compostable multilayer structures, methods for manufacture, and articles prepared therefrom

A method for manufacturing a compostable multilayer film, said method comprising the step:

• extruding at least three layers, said layers comprising:
• (a) core layer comprising a lactic acid residue-containing polymer containing at least about 50% by weight, lactic acid residue units and having a about 20.degree. C. and a number average molecular weight of between about 80,000 and 200,000, said core layer having first and second opposed surfaces;
• (b) first blocking reducing layer covering the first surface of said core layer, said first blocking reducing layer comprising a semicrystalline aliphatic polyester;
• and
• (c) a second blocking reducing layer covering the second surface of said core layer, said second blocking reducing layer comprising a semicrystalline aliphatic polyester,
• wherein the semicrystalline aliphatic polyester has a crystallinity of greater than 10 J/g as determined by a differential scanning calorimeter, and wherein said blocking reducing layers provide reduced blocking compared with said core layer.

A compostable multilayer structure comprising:

• (a) compostable substrate;
• (b) core layer comprising a lactic acid residue-containing polymer containing at least about 50%, by weight, lactic acid residue units and having a about 20.degree. C. and a number average molecular weight from about 80,000 to about 200,000;
• and
• (c) blocking reducing layer covering said core layer, said blocking reducing layer comprising a semicrystalline aliphatic polyester,
• wherein the semicrystalline aliphatic polyester has a crystallinity of greater than 10 J/g as determined by a differential scanning calorimeter, and wherein said blocking reducing layers provide reduced blocking compared with said core layer.