Patent ID: 6841597

Claim:
A biodegradable mixture of polyesters comprising: (A) a polyhydroxy acid of poly-ε-caprolactone and its copolymers with a molecular weight M w greater than 50,000; (B) a polyester of a diacid and a diol with a molecular weight M w greater than 60,000 and a melting point lying between 50 and 90° C.; (C) a polymer of lactic acid which contains at least 75% L-lactic or D-lactic acid or their combinations with a molecular weight M w greater than 30,000 in which the concentration of (A) varies with respect to (A+B) in the range of between 40 and 70% by weight, and the concentration of C with respect to (A+B+C) lies between 2 and 30 by weight and with a UV stability measured on film of 25-30 μm which has an average reduction in its tensile properties after 216 hours of exposure to UV rays less than 30% considered as the average reduction in breaking load, elongation at breakage and longitudinal breaking energy.