Copolymers and their use as auxiliaries and/or additives in formulations for the preparation of polyisocyanate addition polymerization products
CA 2002399 C · Owner: Lutter, Heinz-Dieter · Inventors: Lutter, Heinz-Dieter; Horn, Peter; Rehmer, Gerd
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention deals with novel copolymers having K values of from 5 to 80 prepared by the radical polymerization of: (A) 20 to 80 weight percent, based on the total weight of (A) and (B), of at least one olefinic unsaturated polyoxyalkylene alcohol adduct or a polyester alcohol adduct;, (B) 80 to 20 weight percent based on the total weight, of (A) and (B) of at least one vinyl monomer, selected from the group consisting of N-vinylformamide N-vinyl-2-pyrrolidone, N-vinyl-piperidone N-vinyl-2-caprolactam, N-vinylimidazole N-vinyl-2-ethylene-urea and N-vinyl-2-propylene-urea; (C) 0 to 40 parts by weight of glycidyl acrylate and/or glycidyl methacrylate;, (D) 0 to 10 parts by weight of at …
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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 7, 1989 and granted April 27, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 7, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 7, 2011.
- 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.