Biodegradable multiphase compositions based on starch
AssigneeNovamont S.p.A.
InventorsCatia Bastioli, Giovanni Floridi, Gianfranco Del Tredici
Life of this patent
Estimating the term…
Abstract
The present invention relates to biodegradable multiphase compositions characterized in that they comprise three phases: (a) a continuous phase composed of a matrix of at least one tough hydrophobic polymer incompatible with the starch; (b) a nanoparticulate dispersed starch phase with mean dimensions of less than 0.3 μm, (c) a further dispersed phase of at least one rigid and fragile polymer with modulus greater than 1000 MPa. Such compositions having a Modulus greater than 300 MPa and a substantial isotropy in the two longitudinal and transverse directions in relation to tear propagation.
Claims41
Biodegradable composition characterized by comprising three phases:
- A. a continuous phase consisting of a matrix of at least one tough hydrophobic polymer incompatible with starch, said tough thermoplastic polymer having a Modulus of less than 200 MPa;
- B. a homogeneously dispersed nanoparticulate starch phase;
- C. a further dispersed phase of at least one polymer with modulus greater than 1000 MPa, said polymer being a polyhydroxyalkanoate;
- and having:
- a Modulus greater than 300 MPa;
- a substantial isotropy in the two longitudinal and transverse directions in relation to tear propagation;
- particles of the dispersed starch phase (B) with mean dimensions of less than 0.3 μm.
Dependencies are inferred from the claim text.