Patent ID: 6730724
Filing Date: 2004-05-04
Classification: C08L

Abstract:
Biodegradable heterophase compositions comprising (1) partially or completely destructurised and/or complexed starch, (2) a polysaccharide ester, and (3) a plasticizer for the polysaccharide ester, in which the polysaccharide ester constitutes the matrix and the starch the dispersed phase,characterized in that the compositions comprise starch and plasticized polysaccharide ester in a ratio by weight of from 1:0.6 to 1:18, the polysaccharide ester is plasticized with a plasticizer in a quantity of from 10 to 40% by weight referred to the polysaccharide ester and the starch is in the form of particles or domains of average numeral dimension lower than 1 &mgr;m for at least 80% of the particles, the biodegradable heterophase compositions further comprising an additive which can increase and maintain a pH of 4 or more for a solution obtained by placing the compositions in pellet or particle form in contact with water at ambient temperature for 1 hour with the use of a pellet/particles:water ratio of 1:10 by weight.