Durable polyhydroxyalkanoate compositions

A polyhydroxyalkanoate composition having an elongation at break (ASTM D638) greater than 3%, an impact resistance (Charpy test;

• ISO179 1eU, 23° C., unnotched) greater than 18 kJ/m2 and a flexural modulus of at least 950 MPa comprising:
• at least 25% wt of a polyhydroxyalkanoate component (I), comprising one or more hydroxyalkanoate copolymers wherein the content of poly(3-hydroxybutyrate) homopolymer is and less than 5% wt;
• from 5 to 40% wt of a mixture (II) of a thermoplastic polyurethane (IIa) which is a block copolymer, and has a hardness lower than 56 Shore D, as measured according to ASTM D2240 in admixture with an acrylic polymer (IIb), which is thermoplastic, with a melting flow index according to ASTM D1238 at 175° C./2.16 kg higher than 0.25 g/10 min and/or a glass transition temperature less than 150° C.;
• wherein the acrylic polymer (IIb) is an acrylic terpolymer (IIb2) of ethylene, an alkyl acrylate or methacrylate, and glycidyl methacrylate or glycidyl acrylate,
• comprising no more than 5% wt biodegradable polymers (ASTM D6400);
• from 0 to 40% wt of one or more fillers (III);
• from 0 to 20% wt of one or more plasticizers (IV);
• and
• from 0 to 10% wt of one or more additives (V),
• wherein
• component (I) and mixture (II) together comprise at least 40% wt of the composition, and
• the % wt of the components is calculated on the total weight of components (I) to (V) of the composition and adds up to 100% wt.