Method of making ring-opened polynorbornene polymers using pot life extending agents
CA 2028973 A1 · Owner: Sugahara, Tomoo · Inventors: Yamato, Motoyuki; Torii, Masao; Okumura, Kin-Ichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A reaction solution comprising a mixture of tricyclopentadiene, a norbornene monomer with at least 3 rings in its backbone, a 5-alkenyl-2-norbornene pot life adjusting agen along with a molybdenum type catalyst system gives prolonged pot life without extending time to exotherm (e.g. smoking time). By utilizing this reaction solution it is possible to bulk polymerize reinforced or unreinforced articles in a mold via ring-opening polymerization. Articles so obtained have good outward appearance and excellent physical properties. potlife.ttd
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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 October 31, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 31, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 31, 2012.
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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.