Patent ID: 8193298

Claim:
Biodegradable aliphatic/aromatic copolyester (AAPE) comprising: A) an acid component comprising repeating units of: 1) 50 to 60 mol % of an aromatic polyfunctional acid; 2) 40 to 50 mol % of an aliphatic acid, at least 90% of which is a long-chain dicarboxylic acid (LCDA) of natural origin selected from azelaic acid, sebacic acid, brassylic acid or mixtures thereof; B) at least one diol component; said aliphatic long-chain dicarboxylic acid (LCDA) and said diol component (B) having a number of carbon atoms according to the following formula: (C LCDA ·Y LCDA )/2+C B Y B >7.5 where: C LCDA is the number of carbon atoms of the LCDA and can be 9, 10 or 13; Y LCDA is the molar fraction of each LCDA on the total number of moles of LCDA; C B is the number of carbon atoms of each diol component; Y B is the molar fraction of each diol on the total number of moles of the diol component (B) said AAPE having: a biodegradability after 90 days higher than 70%, with respect to pure cellulose according to the Standard ISO 14855Amendment 1, a density of equal to or less than 1.2 g/cc; a number average molecular weight of 40,000-140,000; an inherent viscosity of 0.8-1.5.