Low temperature process for the preparation of isopropenyl-alpha, alpha-dimethyl-benzyl isocyanate - grafted latexes
CA 2055185 A1 · Owner: Lucas, Howard Robert · Inventors: Lucas, Howard Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
31,390-00, A LOW TEMPERATURE PROCESS FOR THE PREPARATION OF ISOPROPENYL-ALPHA,ALPHA-DIMETHYLBENZYL ISOCYANATE - GRAFTED LATEXES, ABSTRACT OF DISCLOSURE A process for the preparation of novel grafted latexes having backbones formed from unsaturated monomers and having pendent isocyanate containing sidechains derived from isopropenyl-alpha alpha-, dimethylbenzyl isocyanate or copolymers thereof is described. Grafting latexes is carried out using a free radical redox initiator system in an aqueous medium. Latexes such as polybutadiene polyvinyl chloride, and, polyvinyl chloride-acrylic copolymers are converted to the corresponding isocyanate-functional latexes by the process of the invention. …
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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 November 8, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 8, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 8, 2013.
- 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.