Preparation of oxyalkylated, carboxyl-containing polymers
CA 1330611 C · Owner: Trapp, Horst · Inventors: Raubenheimer, Hans-Juergen; Trapp, Horst; Denzinger, Walter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Oxyalkylated carboxyl-, containing polymers are prepared by reacting (A) a polymer which contains one or more monoethylenically unsaturated C3-C8-carboxylic acids as copolymerized units with, (B) an alkylene oxide in an aqueous medium at not more than 120°C by a process in which the reaction is started at a pH of from 5.0 to 5.9 and is ended after a pH of from 5.5 to 8.5 has been reached. As a result of monitoring of the pH the selec-, tivity of the addition reaction of alkylene oxides with the polymers (A) is substantially improved compared with known processes.
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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 July 5, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 5, 2011.
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Timeline
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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.