C - Chemistry – Metallurgy – 09 – C
Patent
C - Chemistry, Metallurgy
09
C
6/194
C09C 3/10 (2006.01) C09B 67/54 (2006.01) C09C 1/02 (2006.01) C09C 1/24 (2006.01) C09C 1/40 (2006.01) C09C 1/42 (2006.01) C09C 3/00 (2006.01) C09D 17/00 (2006.01)
Patent
CA 2014284
- 64 - ABSTRACT A process is disclosed for the production of a purified pigment, in which electrolyte ions and fine particles of the opposite polarity have been either completely or partly eliminated so that the purified pigment will not become a hard cake in a slurry state and will hardly undergo secondary aggregation even when dried. The purified pigment is obtained by bringing an aqueous dispersion of particles of the pigment into contact with an H-type cation-exchange resin or an OH-type anion-exchange resin, whereby counter ions are ion-exchanged to either lower or raise the pH of the aqueous dispersion. As a result, the dispersion stability of the pigment particles is destroyed, and only acidic or basic pigment particles are caused to sediment and are hence separated. A process for the production of a highly-classified purified pigment is also provided. An aqueous dispersion of pigment particles is used after con- ducting ion-exchange treatment and deflocculating the pig- ment particles. The aqueous dispersion is classified rely- ing upon differences in sedimentation velocity among the pigment particles, followed by ion-exchange treatment to destroy the stability of the aqueous dispersion.
Fine Clay Co. Ltd.
Kimoto & Co. Ltd.
Kirby Eades Gale Baker
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