Controlled functional density poly(secondary amines) and method for preparation thereof
CA 2111277 C · Owner: Tremont, Samuel J. · Inventors: Tremont, Samuel J.; Mcgrath, Martin P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing a controlled, functional density poly(secondary amine) comprising: (a) contacting a polymer containing olefinic unsaturation with carbon monoxide in hydrogen under hydroformylation conditions in the presence of a hydroformylation catalyst to produce a controlled functional density polyaldehyde containing reactive carbon-carbon double bonds, and (b) contacting the polyaldehyde with hydrogen and a primary amine under reductive amination conditions in the presence of a ruthenium-containing imine hydrogenation catalyst or (b1) contacting the polyaldehyde with a sterically hindered aliphatic or cycloaliphatic primary amine or an aromatic primary amine under reductive …
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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 13, 1993 and granted June 23, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 13, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 13, 2015.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.