Preparation of modified polysiloxanes
CA 1311330 C · Owner: Dow Corning S.A. · Inventors: Trego, Brian Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The specification describes a method of preparing a polysiloxane including at least one siloxane unit having a siliconbonded group -OX in which X is a saturated or unsaturated hydrocarbon group, for example methyl, alkenyl or alkynyl. The method comprises bringing about chemical reaction between a polymer having at least one siloxane unit having a silicon-bonded hydroxyl group and an alcohol of the general formula HOX in presence of an acidic condensation catalyst of the formula (i) RSO3H in which R represents an alkyl aryl or alkaryl group, which may be halogenated at a temperature of less than 50°C under conditions to cause condensation reaction between hydroxyl groups of the siloxane …
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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 December 8, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 8, 2009.
- 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.