Preparation of easily dispersible and deeply colored pigmentary

Details Preparation of easily dispersible and deeply colored pigmentary Preparation of easily dispersible and deeply colored pigmentary

1979-11-16

1981-11-03

Randolph, John D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

106288Q, 106308Q, 106309, C09B 4704

Patent

active

042985269

ABSTRACT:
A process for the preparation of pigmentary forms of phthalocyanine and of insoluble polycyclic compounds, wherein the crude pigment is milled in the presence of one or more acids which have a pK of <4.9 and are non-oxidizing under the milling conditions, until the primary particle size is .ltoreq.0.1 .mu.m, the milled material is then finished in the conventional manner in a solvent in the presence or absence of water, and the pigment is isolated.
The pigments give very deep colorations and are very easily dispersible in the media in which they are used.

REFERENCES:
patent: 2716649 (1955-08-01), Brouillard
patent: 2930796 (1960-03-01), Katz et al.
patent: 3872103 (1975-03-01), Fabian
patent: 3976649 (1976-08-01), Fabian et al.
patent: 4039346 (1977-08-01), Kranz
patent: 4104276 (1978-08-01), Kranz et al.
patent: 4115386 (1978-09-01), Gall et al.
patent: 4141904 (1979-02-01), Cabut et al.
patent: 4158572 (1979-06-01), Blackburn et al.
Moser et al., Phthalocyanine Compounds, pp. 179 to 180, Reinhold Pub. Corp., NY (1963).

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