Process for preparing core-shell particle dispersions
CA 1298013 C · Owner: Kowalski, Alexander · Inventors: Vogel, Martin; Scott, Joseph David; Kowalski, Alexander
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An aqueous dispersion of water-insoluble core-shell particles is prepared by emulsion polymerization for use as an opacifying agent in coatings. The particles have interior cores which are swollen with nonaqueous solvent. The polymeric exterior shells have a glass transition temperature greater than about 50°C in the presence of the nonaqueous solvent. The partition coefficient for the nonaqueous solvent between the interior core polymer phase and the exterior shell polymer phase is at least about 1.25. The interior core preferably has a low average molecular weight while the average molecular weight of the exterior shell is high. The interior core is preferably polymerized from …
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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
- Granted March 24, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 24, 2009.
- 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.