Patent ID: 8043679

Claim:
Multiphase biodegradable compositions comprising at least two phases: (a) a continuous phase composed of a matrix of at least one tough hydrophobic polymer incompatible with starch, said polymer being selected from the class of polyesters from diacid-diol; (b) a homogeneously dispersed nanoparticulate starch phase; wherein a flint of a thickness of 20 μm obtained from said compositions and tested according to ASTM D822 is characterized by a K factor greater than 28 and by numeric mean dimentions of the particles of said dispersed starch phase (b) of less than 0.25 μm, wherein the K factor is defined by the following formula K =(Breaking load)×(Young's Modulus)×(Breaking energy)/1,000,000 With Breaking load and Young's Modulus expressed in MPa and Breaking energy in KJ/m 2 .