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US 2009/0311455 A1Published application
Biodegradable compositions based on nanoparticulate starch
AssigneeNovamont S.p.A.
InventorsCatia Bastioli, Giovanni Floridi, Gianfranco Del Tredici
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Abstract
The present invention relates to biodegradable multiphase compositions comprising a continuous phase composed of a matrix of at least one tough hydrophobic polymer incompatible with the starch and a nanoparticulate dispersed starch phase with mean dimensions of less than 0.25 m. The compositions are characterized by breaking load, Young's Modulus and breaking energy.
Claims48
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 dimensions 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/m2.
2 more elements
Dependencies are inferred from the claim text.