Conversion of crude copper phthalocyanines into pigments

Details Conversion of crude copper phthalocyanines into pigments Conversion of crude copper phthalocyanines into pigments

1976-02-05

1977-08-02

Douglas, Winston A.

Compositions: coating or plastic

Materials or ingredients

106308N, 106309, 2603145, C08K 534

Patent

active

040393461

ABSTRACT:
A process for converting copper phthalocyanine into a pigmentary form, wherein finely divided crude copper phthalocyanine, which has crystallized irregularly and is heavily agglomerated, is finished in the presence of basic copper phthalocyanines of the formula ##STR1## WHERE CuPc is an n-valent copper phthalocyanine radical, R.sup.1 is hydrogen or alkyl, A is alkylene of 2 to 6 carbon atoms, R.sup.2 is alkyl, alkoxyalkyl or cycloalkyl and R.sup.3 is hydrogen or alkyl, or the group ##STR2## is a saturated 5-membered, 6-membered or 7-membered heterocyclic ring and n is from 1 to 6, in from 50 to 75% strength by weight sulfuric acid at from room temperature to 100.degree. C.
The pigments obtained are of significantly greater tinctorial strength than the pigmentary forms obtained in the absence of basic copper phthalocyanines.

REFERENCES:
patent: 2861005 (1958-11-01), Siegel
patent: 3288621 (1966-11-01), Barron et al.
patent: 3713857 (1973-01-01), Shapiro
patent: 3920469 (1975-11-01), Kienzle et al.
patent: 3951678 (1976-04-01), Wanser

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