C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
C09B 47/04 (2006.01) C09B 67/00 (2006.01) C09B 67/22 (2006.01)
Patent
CA 2125083
A process for the production of a copper phthalocyanine pigment composition from 70 to 99 % by weight of a crude copper phthalocyanine and 30 to 1 % by weight of a phthalocyanine derivative, the crude copper phthalocyanine being converted to a pigment without a large amount of energy and the treatment of exhaust water, the copper phthalocyanine pigment composition having excellent fluidity, tinting strength and stability with time when used in coating composition or a printing ink, the copper phthalocyanine pigment composition showing almost no "strike-through" when used for gravure printing on low-quality paper, the process comprising dry milling the entirety of the crude copper phthalocyanine and the phthalocyanine derivative in an amount of 0.5 to 10 % by weight of a final composition in the absence of a milling auxiliary until the content of an .alpha.-form phthalocyanine in the crude copper phthalocyanine is at least 20 % by weight, and adding and mixing the remaining phthalocyanine derivative to/with the dry-milled product.
Kato Shigeki
Muramatsu Yoshi
Tsuji Kosaku
Smart & Biggar
Toyo Ink Manufacturing Co. Ltd.
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