A process for the preparation of a modified copolymer as a pigment dispersant for aqueous coating compositions
CA 2086047 C · Owner: Czornij, Zenon P. · Inventors: Carpenter, Clint W.; Czornij, Zenon P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a process for the preparation of modified copolymers as a pigment dispersant for coating compositions comprising the steps of a) polymerizing, i) an ethylenically unsaturated monomer containing an isocyanate group with, ii) an ethylenically unsaturated monomer selected from the group consisting of vinyl aromatics phenyl &, alkylphenyl (meth)acrylates & (meth)acrylamides. iii) another ethylenically unsaturated monomer having no functional group capable of undergoing a reaction with said isocyanate group to form a copolymer with isocyanate groups and, b) reacting one after another or simultaneously said isocyanate group with, iv) a polyalkyleneglycol …
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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 December 22, 1992 and granted November 9, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 22, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 22, 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.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.