Polyolefin compositions having good transparency and impact resistance
CA 2090250 C · Owner: Ghisellini, Renato · Inventors: Cecchin, Giuliano; Malucelli, Decio; Ghisellini, Renato
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polyolefin compositions having good transparency and impact resistance even at low temperatures comprising (by weight): A) from 25 to 95 parts of a crystalline random copolymer of propylene with ethylene and/or another .alpha.-olefin containing more than 85% by weight of propylene and, having Haze values lower than 25%; and B) from 5 to 75 parts of a component comprising (a) an elastomeric copolymer of ethylene with propylene and/or another .alpha.-olefin, and optionally with minor proportions of a diene, containing 20-80 parts of ethylene and (b), one or more of the polymers selected from LLDPE LDPE, HDPE, having a Melt Index higher than 0.5 g/10 min. said (a) and (b) being present in such …
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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 February 23, 1993 and granted July 18, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 23, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 23, 2015.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
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.