Preparation of pigmentary form isoindoline

Details Preparation of pigmentary form isoindoline Preparation of pigmentary form isoindoline

1979-01-05

1981-06-02

Coughlan, Jr., Paul M.

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

Organic compounds

Nitrogen attached directly or indirectly to the purine ring...

106288Q, 544300, C09B 5704

Patent

active

042713013

ABSTRACT:
A process for converting finely particled agglomerated crude isoindoline pigments of the formula ##STR1## where A is ##STR2## and B is the radical of an unsubstituted or substituted barbituric acid, or A and B are both such a barbituric acid radical, into tinctorially valuable pigmentary forms, wherein the crude pigment, which consists of primary particles having a mean size of .ltoreq.0.1 .mu.m, is subjected to shearing forces in water, and thereafter the aqueous suspension is heated at from 90.degree. to 160.degree. C. in the presence or absence of a surfactant and the pigment is isolated. Easily dispersible, high-hiding to extremely high-hiding pigments are obtained, which give brilliant colorations of improved lightfastness and fastness to weathering.

REFERENCES:
patent: 3991054 (1976-11-01), Bock et al.
patent: 4013481 (1977-03-01), Molls et al.
patent: 4127420 (1978-11-01), Harris et al.
patent: 4166179 (1979-08-01), Lotsch
Chemical Abstracts, 1978, 88:122669n, (Lotsch).

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