Preparation of pigmentary form of quinacridone pigments

Details Preparation of pigmentary form of quinacridone pigments Preparation of pigmentary form of quinacridone pigments

1982-04-16

1984-06-19

Daus, Donald G.

Compositions: coating or plastic

Materials or ingredients

106309, 546 56, 546 57, C09B 4800

Patent

active

044551738

ABSTRACT:
Pigmentary grade quinacridone pigments are prepared from crude quinacridone by conversion to aggregated low crystallinity quinacridones followed by milling the aggregated low crystallinity quinacridone in the presence of a liquid which wets the pigment and can improve the crystallinity of quinacridone at 10.degree. to 60.degree. C. Suitable quinacridones include ##STR1## and mixtures thereof with up to 15 wt. % of ##STR2## where R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 R.sup.6 are hydrogen, fluorine, chlorine, bromine, methyl or methoxy; R.sup.7, R.sup.9 and R.sup.10 are hydrogen or chlorine; and R.sup.8 is hydrogen, chlorine, bromine, nitro, alkyl groups of 1 to 5 carbon atoms, alkoxy groups of 1 or 2 carbon atoms or benzoylamino, and m is an integer of from 1 to 4.

REFERENCES:
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patent: 3287147 (1966-11-01), Wilkinson
patent: 3364300 (1966-08-01), Keily et al.
patent: 4094699 (1978-06-01), Fitzgerald
patent: 4212975 (1980-07-01), Kroh et al.
patent: 4371643 (1983-01-01), Thomas

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