Base-catalyzed process for preparing hydrogen-containing organopolysiloxanes
CA 2133166 C · Owner: Wacker-Chemie Gmbh · Inventors: Gratzl, Petra; Dauth, Jochen; Deubzer, Bernward
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process wherein a mixture containing, (A) organosilicon compounds selected from (Al) organosilanes, (A2) organosiloxanes with the proviso that component A has at least 0.01 - 4 mole of alkoxy groups per mole of silicon atoms and that at least a part of the organosilicon compounds of the component A comprises Si-bonded hydrogen (B) at least 0.5 mole of water per mole of alkoxy groups in component A, and, (C) optionally a water-miscible solvent is reacted in the, presence of, (D) ammonia a primary or secondary C1-C4-alkylamine or a compound which liberates ammonia or primary or secondary C1-C4-alkylamine on reaction with water to form organopolysiloxanes …
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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 September 28, 1994 and granted September 29, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 28, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 28, 2016.
- 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.