Biodegradable foamed plastic materials
AssigneeNovamont S.p.A.
InventorsCatia Bastioli, Vittorio Bellotti, Gianfranco Del Tredici, Alessandro Montino, Roberto Ponti
Life of this patent
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Abstract
Biodegradable foamed plastic material having a bulk density comprised within the range of from 5 to 13 kg/m.sup.3, comprising: 30-99.5 by weight of polisaccharide containing more than 50% of thermoplastic starch or starch complexed by polimeric structures, having an intrinsic viscosity (in DMSO) lower than 1.3 dl/g and less than 20% by weight of soluble fraction in ethanol; 0.5-70% by weight of a thermoplastic polymer which is soluble in starch, or is capable of complexing it; 0-20% by weight of water. The material can be used as a loose filler or for other foamed articles.
Claims14
Biodegradable foamed plastic material having a bulk density value comprised within the range of from 5 to 13 kg/m.sup.3, and a corresponding specific density equal or lower than 32 kg/m.sup.3, comprising:
- from 30 to 99.5% by weight of a polysaccharide containing a level higher than 50%, of thermoplastic starch or starch complexed with natural or synthetic polymeric structures, wherein said starch has:
- an intrinsic viscosity lower than 1.3 dl/g;
- an ethanol soluble fraction at 25.degree. C. lower than 20% by weight;
- from 0.5 to 70% by weight of one or more thermoplastic polymers, wherein at least 10% of this fraction is constituted by a thermoplastic polymer (A) which is soluble in starch, or (B) is capable of complexing starch;
- and
- from 0 to 20% by weight of water.
Dependencies are inferred from the claim text.