Process for the production of dis-azo pigment

Details Process for the production of dis-azo pigment Process for the production of dis-azo pigment

1995-04-05

1997-04-22

Bell, Mark L.

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106493, C09B 2700

Patent

active

056225555

ABSTRACT:
A process for the production of a dis-azo pigment having excellent dispersibility, high tinting strength and high masking strength, by a simple method under an improved working environment, which is improved in a drying step and can omit the pulverization step of a conventional process, the present process comprising
(a) a first step of forming an aqueous paste or slurry containing a synthesized dis-azo pigment into fine particles under hot air at 100.degree. to 300.degree. C. for a short period of time within 0.5 hour, and at the same time, removing water from the formed fine particles to form a powder, and
(b) a second step of keeping the powder under heat at 50.degree. to 150.degree. C. for 0.5 to 10 hours.

REFERENCES:
patent: 3991044 (1976-11-01), Conley
patent: 4894094 (1990-01-01), Ruff et al.
Sumitomo, Patent Abstracts of Japan, unexamined applications C field, vol. 6, No. 127, Jul. 13, 1982, p. 107 C113 of JP 57-53568.

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