Monovinylidene aromatic and conjugated diene copolymer coating compositions comprising sulfoalkyl monomeric emulsifier
CA 2013747 C · Owner: Lam, Chiu-Kwan · Inventors: Guillaume, Jean-Luc; Lam, Chiu-Kwan; Oliver, Stephen M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
It has been found that monovinylidene, aromatic/conjugated diene/ethylenically unsaturated acid copolymer compositions are provided with good combinations of physical properties when a sulfoalkyl monomer is employed in minor amounts in such polymer in place of emulsifying additive(s). In particular the, combinations of wet and dry pick resistance have been shown to be maintained or improved when paper coating formulations are prepared from latex polymer compositions according to this invention. Sulfoalkyl (meth)acrylate salts and 2-acrylamido-2-methylpropane sulfonic acid salts are shown to be suitable sulfoalkyl monomers for this purpose.
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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 April 3, 1990 and granted April 24, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 3, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 3, 2012.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.