A method for the preparation of destructured-starch-based compositions and compositions produced thereby
CA 2017655 C · Owner: Del Tredici, Gianfranco · Inventors: Lombi, Roberto; Guanella, Italo; Del Tredici, Gianfranco
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
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 and 170°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°C and is suitable for extrusion at low pressure with these polymers. …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed May 28, 1990 and granted May 8, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 28, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 28, 2012.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.