Impact resistant rigid pvc compositions using hydrocarbon rubbers and chlorinated polyethylene as impact modifiers
CA 2469206 A1 · Owner: Wenben Inc. · Inventors: Berard, Mark Thomas; Marchand, Gary Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is specifically directed to improved polyvinyl chloride compositions having excellent impact strength. In particular the impact , resistant composition comprises a) a vinyl chloride polymer b) at least one , ethylene/alpha-olefin copolymer said copolymer having a density of 0.858 to 0.91 g/cc and having a melt index from an I10 value of 0.1 to an I2value of 50, preferably from an I10 value of 0.1 to an I2 value of 30 and most , preferably from an I10 value of 0.1 to an I2 value of 20 and c) at least one , randomly chlorinated olefin polymer having a chlorine content of from 20-40 percent by weight, the feedstock for said chlorinated olefin polymer having a melt …
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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 December 16, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 16, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 16, 2024.
- 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
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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.