Anionic polymerization process
CA 1283995 C · Owner: Shell Canada Limited · Inventors: Handlin, Dale L. Jr.; Wong, Pui K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for preparing polymers which may be coupled at temperatures above 200 °C by first reacting conjugated dienes and/or monoalkenyl arenes with an organomonolithium initiator and then reacting the resulting polymeric arms with arylcyclobutene monomers having the formula, or, where X is alkylene or arylene Z is arylcyclobutene and R is H, aryl, alkyl or R1 being aryl or alkyl.
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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
- Granted May 7, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 7, 2008.
- 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.