초록 ▼

A compostable multilayer film includes a core layer having a first surface and a second surface, a first blocking reducing layer covering the first surface of the core layer, and a second blocking reducing core layer comprises a lactic acid residue-containing polymer having a glass transition temper

A compostable multilayer film includes a core layer having a first surface and a second surface, a first blocking reducing layer covering the first surface of the core layer, and a second blocking reducing core layer comprises a lactic acid residue-containing polymer having a glass transition temperature (Tg) below 20.degree. C. The first and second blocking reducing layers comprise a semicrystalline aliphatic polyester. The hydrolyzable polymer and have a T.sub.g above about 50.degree. C. The multilayer structure can be used for preparing bags and wrappers.

대표청구항 ▼

[ What is claimed:] [1.] A compostable multilayer film 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 T.sub.g below 20.degree. C. and a number average molecular weight of between about 80,0

[ What is claimed:] [1.] A compostable multilayer film 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 T.sub.g below 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, rein 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.[ D5338-92, modified to test at about 58.degree. C.][ D5338-92, modified to test at about 58.degree. C.][ D1922-89, and exhibiting substantially no blocking when folded back on itself and held together under a pressure of 180 g/in.sup.2 at 50.degree. C. for two hours.][ D1922-89.][ D1922-89.]