A new polyolefinic rubbers and process for their preparation
CA 2045141 C · Owner: Sofrapo-Commerciale · Inventors: Mehalla, Hacene; Breant, Patrice; Morese-Seguela, Brigitte
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a polyolefinic rubber which is a copolymer ethylen/propylen and/or buten-1 having a fluidity index from 0.3 to 15dg/min and a density from 0.860 to 0.885 comprising 74- 91 % mol of patterns derived from ethylen and 9-26 % mol of patterns derived from propylen and/or buten-1 characterized by a crystalline fusion temperature J from 100 C to 125 C. The method for obtaining such rubber comprises the copolymerisation at a temperature of 150 C-300 C and a pressure of 400-200 bars a gas flow containing 15-42 % by volume of ethylen and 58-85 % by volume of propylen and/or buten-1 in the presence of a catalytic Ziegler type system comprising at least one transition metal …
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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 November 8, 1990 and granted July 25, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 8, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 8, 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.
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.