Biodegradable aliphatic-aromatic polyesters

Polymeric composition comprising

• A) a biodegradable aliphatic/aromatic copolyester (AAPE) comprising:
• a) an acid component comprising repeating units of:
• 50 to 60% of an aromatic polyfunctional acid;
• 40 to 50% 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:
• (CLCDA*YLCDA)/2+CB·YB>7.5
• where:
• CLCDA is the number of carbon atoms of the LCDA and can be 9, 10 or 13;
• YLCDA is the molar fraction of each LCDA on the total number of moles of LCDA;
• Cb is the number of carbon atoms of each diol component;
• Yb 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 14855 Amendment 1;
• a density of equal to or less than 1.2 glee;
• a number average molecular weight Mn of 40,000-140,000;
• an inherent viscosity of 0.8-1.5;
• and
• B) at least one other polymer selected from other polyesters of the aliphatic/aromatic type or biodegradable polymers of natural origin or of synthetic origin.