Water-based sulfonated polymer compositions
CA 2259364 A1 · Owner: Wei, Yi · Inventors: Zhu, Yuduo; Wei, Yi; Duan, Youlu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for the preparation of sulfonated polymer compositions wherein water dispersible isocyanate-terminated polyurethane prepolymers are reacted in the presence of aqueous polyvinyl dispersions which may contain active hydrogen atoms. The invention is further directed to a water-based sulfonated polyurethane polyvinyl hybrid latex wherein a sulfonated polyurethane is used as a seed for the polymerization of ethylenically unsaturated monomers and a method for preparing the same. The inventive compositions develop interpenetrating polymer networks or may form core-shell type structures and , are characterized as having enhanced mechanical and adhesion properties.
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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 August 13, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 13, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 13, 2019.
- 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.