Polymer compositions for the production of articles of biodegradable plastics material and methods for their preparation
CA 2017654 C · Owner: Butterfly S.R.L. · Inventors: Bellotti, Vittorio; Lombi, Roberto; Bastioli, Catia
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polymer composition usable far the production of articles of biodegradable plastics material includes an ethylene/vinyl alcohol copolymer and destructured starch. Preferably the composition is obtainable by mixing the ethylene/vinyl alcohol copolymer, in a heated extruder with a starch component constituted by a destructured starch composition produced beforehand by mixing starch with a high-boiling plasticizer, such as glycerine and a destructuring agent, preferably constituted by urea in, an extruder. Alternatively, the composition can be obtained by mixing the ethylene/vinyl alcohol copolymer with starch. and a plasticizer in an extruder with water, added as appropriate and possibly …
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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.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.