Siloxanyl-phosphate mixture and its use in stabilizing metal silanolates in siloxane polymers
CA 2062884 C · Owner: Dow Corning Corporation · Inventors: Lamont, Peter; Beck, James Anderson
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Siloxanyl-phosphate mixtures are prepared by reacting cyclopolydimethylsiloxane and a silylphosphate mixture. The siloxanyl-phosphate mixture is a mixture of 5 to 30 weight percent of a monosiloxanyl-phosphate of the formula, (see formula I), 70 to 85 weight percent of a disiloxanyl-phosphate of the formula, (see formula II), 2 to 11 weight percent of a trisiloxanyl-phosphate of the formula, (see formula III), wherein x has an average value of from 3 to 30. These siloxanyl-phosphate mixtures are useful in stabilizing basic polymerization catalysts such aspotassium hydroxide or potassium silanolate and can either be used effectively per se or in combination with carbon dioxide.
Read the whole patent
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 March 12, 1992 and granted December 25, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 12, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 2014.
- 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.