Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1995-08-21
1996-10-29
Nutter, Nathan M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524 52, 524 53, 26432814, C08L 8906, C08L10100
Patent
active
055696929
ABSTRACT:
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.
REFERENCES:
patent: 5095054 (1992-03-01), Lay et al.
Bastioli Catia
Del Tredici Gianfranco
Guanella Italo
Lombi Roberto
Novamont S.p.A.
Nutter Nathan M.
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