Mixtures of biodegradable polyesters with at least one polymer of natural origin

摘要

The present invention relates to mixtures comprising of biodegradable polyesters comprising at least one polymer of natural origin and at least two aliphatic-aromatic polyesters of the diacid-diol type of which at least one with a high content of long chain aliphatic diacids of renewable origin showing excellent mechanical properties, sufficiently high melting temperatures, adequate crystallization rates, improved biodegradability properties as well as stability of physical properties over time.

主权项

1. Mixture comprising :
(A) at least a first aliphatic-aromatic biodegradable polyester (A) of the diacid-diol type obtainable by a mixture comprising:
a) at least one acid component having the following composition:
a1) 51-95% by moles of aliphatic dicarboxylic acids, composed for at least 50% by moles of long chain diacids of renewable origin;a2) 5-49% by moles of polyfunctional aromatic acids;b) at least one diol; (B) at least a second biodegradable aliphatic-aromatic polyester (B) obtainable starting from a mixture comprising adipic acid, terephthalic acid and at least one aliphatic diol; (C) at least one polymer of natural origin (C);
wherein the concentration of (A) varies, with respect to (A+B) in the interval between 5 and 95% in weight, wherein (C) is present in a quantity lower than 50% in weight with respect to (A+B+C), said mixture having a Melt Flow Index of 1.5-10 g/10 min.