Process for the production of phthalocyanine pigment

Details Process for the production of phthalocyanine pigment Process for the production of phthalocyanine pigment

1997-10-08

1999-01-12

Raymond, Richard L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

540122, 540139, 540131, 540133, C09B 4706

Patent

active

058592377

ABSTRACT:
A process for the production of a phthalocyanine pigment having a clear color tone, a high tinting strength and a finely milled structure by an efficient and economical process, in which the pigmentation from a phthalocyanine crude can be carried out without removing an aromatic hydrocarbon solvent used in the synthesis of the phthalocyanine crude, the process comprising thes steps of
(a) reacting phthalic anhydride or its derivative, urea or its derivative and a catalyst in an organic solvent to synthesize a phthalocyanine crude,
(b) wet-milling a slurry of the synthesized phthalocyanine crude in the presence of a milling medium without removing the aromatic hydrocarbon solvent, and
(c) removing the organic solvent from the slurry of the milled product, purifying the milled product and drying the milled product with a spray type dryer.

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patent: 5492563 (1996-02-01), Urban
Azuma et al., Patent Abstracts of Japan, vol. 017, No. 492 (C-1107), 7 Sep. 1993, JP-A-05 125 289.
Kawasaki Kasei Chemicals Ltd., Chemical Abstracts, vol. 94,I No. 12, 23 Mar. 1981, Columbus, Ohio US Abstract No. 85671h.

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