Process for the anionic polymerization of monomers
CA 1281488 C · Owner: Shell Canada Limited · Inventors: Bean, Arthur Robinson, Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a process for anionic polymerization of a monomer by (a) reacting batchwise at a temperature ? 50 °C a monomer and anionic initiator, and (b) then reacting continuously or semi-continuously the product of step (a) with additional monomer polymers having a, narrow molecular weight distraction are obtained by commencing step (b) by continuously or semi-continuously adding monomer to the product of step (a), whilst remaining a molar ratio unreacted monomer in step (a) to initiator charge to step (a) of at least 1:1.
Read the whole patent
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 March 12, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 12, 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.