Process for the preparation of polymers of conjugated dienes and optionally monoalkenyl aromatic hydrocarbons
CA 1249696 A · Owner: Shell Canada Limited · Inventors: Broekhuis, Antonius A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the preparation of polymers of conjugated dienes and optionally monoalkenyl aromatic hydrocarbons by polymerization of conjugated diene and optionally monoalkenyl aromatic hydrocarbon monomers in the presence of a hydrocarbon diluent a, hydrocarbyl alkali metal compound and a Lewis base having the formula, wherein, R1 is an alkyl group having 2-18 carbon atoms; R2 and R3 are hydrogen or an alkyl group having 1-4 carbon atoms;, R4 is hydrogen or an alkyl group having 1-6 carbon atoms and, R5 is an alkyl group having 1-18 carbon atoms.
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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 January 31, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 31, 2006.
- 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.