Pigment composition and preparation process thereof
CA 1286825 C · Owner: Dainichiseika Color & Chemicals Mfg. Co. Ltd. · Inventors: Kanbara, Yukio; Shinoda, Takamitu; Kanou, Kazuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pigment composition is composed of an intimate mixture of 75 - 95 wt.% of an organic pigment and the remainder of a polymer. Monomers which form the polymer include 0 - 40 wt.% of styrene 20 - 70 wt.% of, a methacrylic ester and 20 - 50 wt.% of methacrylic acid. The total proportion of styrene, the methacrylic ester and methacrylic acid is at least 85 wt.% of the entire monomers. The pigment composition is prepared by mixing the organic pigment with an aqueous alkaline solution, which contains the polymer and an alkali metal salt, alkali metal hydroxide, lower amine or ammonium, to form an aqueous dispersion. The organic pigment and polymer are then subjected to coprecipitation, …
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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 July 23, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 23, 2008.
- 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.