Method for production of aqueous dispersion of inorganic pigment
CA 1312987 C · Owner: Nippon Shokubai Kagaku Kogyo Co. Ltd. · Inventors: Sasabe, Masazumi; Dairoku, Yorimichi; Fujiwara, Teruaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for the production of an aqueous dispersion by the dispersion of an inorganic pigment such as calcium carbonate and aluminum hydroxide in an aqueous medium, which method comprises incorporating in said inorganic pigment as a dispersant a carboxyl group-containing water-soluble polymer possessing a number average molecular weight in the range of 2,000 to 80,000 and/or a water-soluble condensed phosphate and a water-soluble anionic modified polyvinyl alcohol possessing a polymerization degree in the range of 30 to 700, a saponification degree in the range of 30 to 100 mol%, and an anionic modification degree in the range of 0.5 to 20 mol%. - 39 -
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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 January 19, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 19, 2010.
- 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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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.