Ciba-Geigy Corporation

Michael D McFarlane

Robert Langley

Ian A Lambie

The present invention provides a process for producing beta-form pigmentary copper phthalocyanine comprising a) producing crude copper phthalocyanine by charging phthalic anhydride or phthalimide, urea, a copper compound and a catalyst, at a substantially continuous and uniform rate, into a reaction chamber containing dry, granular, pre-formed copper phthalocyanine, and removing the reaction product from the reaction chamber; and b) convening the crude copper phthalocyanine produced in step a) into pigmentary form, by milling it either in the dry state or in an aqueous medium; mixing the milled material with an aqueous emulsion comprising i) a liquid C.sub.6 -C.sub.20 amine which is insoluble in water or alkali but is soluble in acid and ii) a surfactant capable of emulsifying the liquid amine; rendering the resulting mixture acidic to thereby dissolve the amine; and finally separating the desired pigmentary copper phthalocyanine from the treatment mixture.

Production of beta form pigmentary copper phthalocyanine

A heat-stable, pigmented thermoplastic resin composition comprising A) a thermoplastic resin; B) a metal phthalocyanine pigment; and C) 0.5 to 30% by weight of, based on the weight of component B), as agent for imparting heat stability to component B), a phthalocyanine compound having the formula (I):

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Houston, United Kingdom

Michael D McFarlane