Novamont S.p.a.

Italo Guanella

Catia Bastioli

Gianfranco Del Tredici

Roberto Ponti

Roberto Lombi

Giovanni Floridi

Vittorio Bellotti

Tiziana Milizia

Claudio Russo

A biodegradable mixture obtained by melt mixing polyesters comprising (A) an aliphatic polyester obtained from aliphatic diacids selected from the group consisting of azelaic acid, sebacic acid, brassilic acid, mixtures thereof and mixtures of said acids with aliphatic dicarbossilic acids and/or aliphatic hydroxyacids containing more than 50 mole % of azelaic acid, sebacic acid and brassilic acid, and from aliphatic diols; (B) a polymer of lactic acid in which the concentration by weight of A with respect to (A+B) is in the range of 30 to 60% and in which the sum of the fusion entalpy &#x394;Hand &#x394;Hof the two polyesters in the mixture is greater than the sum of the fusion entalpies &#x394;Hand &#x394;Hof the polyesters prior to melt mixing.

Binary mixtures of biodegradable aliphatic polyesters and products obtained from these

The invention relates to a mixture of biodegradable polyesters which includes an aromatic-aliphatic polyester (A), an aliphatic polyester (B) and a polylactic acid polymer (C) in which the concentration of A varies, with respect to (A+B) in the range between 40 and 70% by weight, and the concentration of C with respect of (A+B+C) is of between 6 and 30% by weight.

Ternary mixtures of biodegradable polyesters and products manufactured from them

The invention relates to a mixture of biodegradable polyesters comprising: (A) a polyhydroxy acid of the poly-&#x3b5;-caprolactone type and its copolymers, (B) aliphatic polyester, and (C) a polymer of polylactic acid, in which the concentration of (A) varies with respect to (A+B) in the range between 40 and 70% by weight, and the concentration of (C) with respects to (A+B+C) lies between 2 and 30%.

Ternary mixture of biodegradable polyesters and products obtained therefrom

The invention relates to a mixture of biodegradable polyesters which includes an aromatic-aliphatic polyester (A), an aliphatic polyester (B) and a polyactic acid polymer (C) in which the concentration of A varies, with respect to (A&plus;B) in the range between 40 and 70% by weight, and the concentration of C with respect to (A&plus;B&plus;C) is of between 6 and 30% by weight.

Heterophasic compositions comprising starch and a thermoplastic polymer that is incompatible with the starch, in which the starch constitutes the discontinuous phase and the thermoplastic polymer the continuous matrix, having an impact strength greater than 30 KJ/m2 (measured on blown film of 30 microns thick at 10&deg; C. and RH less than 5%), and further characterised by the presence in the X-ray diffraction spectrum of a peak at an angle 2-theta from 13 to 14&deg; the ratio of the intensity of which to that of the peak of the amorphous starch which occurs at 20.5&deg;, is less than 2 and greater than 0.02.

Complexed starch-containing compositions having high mechanical properties

In order to prepare a starch-based composition usable for the production of articles of biodegradable plastics material, a starch is mixed in a heated extruder with a high-boiling plasticizer and a destructuring agent for a time sufficient to cause the starch to be destructured, in dependence on the destructuring agent used, at a temperature below the boiling point of the plasticizer used and between 120.degree. and 170.degree. C. The composition thus obtained is particularly suitable for the formulation of polymer mixtures with polymers which have relatively high melting points, since it can be processed at temperatures higher than 120.degree. C. and is suitable for extrusion at low pressure with these polymers. In particular, compositions thus obtained and mixed with polyvinyl alcohol and/or ethylene vinyl alcohol are suitable for the formation of films by blow-extrusion, since they have the desired characteristics of mechanical strength and resistance to tearing and perforation, or for the formation of articles finished by injection moulding, thermoforming or blowing.

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Romentino, Italy

Italo Guanella