Patent ID: 8835573

Claim:
A composite system, comprising a) at least one biodegradable block copolyester urethane, the block copolyester urethane being formed from (i) a hard segment comprising a polyhydroxyalkanoate diol; and (ii) a polyester diol soft segment and/or polyester ether diol soft segment formed from a diol and/or triol and a dicarboxylic acid or hydroxycarboxylic acid and derivatives thereof as co-component; wherein the hard segment and the soft segment are linked with a bifunctional isocyanate, b) at least one poly-(R)-3-hydroxyalkanoate, c) a filler comprising flax fibers and/or derivatives thereof, and d) optionally one or more further additives, wherein the weight proportion of the at least one poly-(R)-3-hydroxyalkanoate is of 95 to 99.9% by weight; and wherein the weight proportion of the hard segment to the soft segment is from 60:40 to 65:35.