Method for producing polyether polyols in the presence of a multi-metal cyanide complex catalyst
CA 2399507 A1 · Owner: Winkler, Jurgen · Inventors: Grosch, Georg Heinrich; Harre, Kathrin; Stutzer, Dieter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method for producing polyether polyols by reacting diols or polyols with ethylene oxide, propylene oxide butylene oxide or , mixtures thereof in the presence of a multimetal cyanide complex catalyst. The reaction is carried out in a vertical, high cylindrical reactor comprising a discharge nozzle which is situated in the upper reactor area and directed downwards, and by which means the educts and the reaction mixture are supplied; and an outlet which is preferably situated in the lower reactor area and through which the reaction mixture is guided back to the discharge nozzle by means of a pump and via an equalising reservoir in an outer circuit. The , …
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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 February 22, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 22, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 22, 2023.
- 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
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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.