Ciba-geigy Corporation

Ian A Lambie

Robert Langley

Colin D Campbell

Michael D McFarlane

David Keirs

Paul I Yarrow

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 pigment composition comprising (A) a pigmentary phthalocyanine, (B) a phthalocyanine derivative of formula ##STR1## where Pc is a residue of a metal-free or metal phthalocyanine, X is --CH.sub.2 -- or --SO.sub.2 --, R.sup.1 and R.sup.2 are independently hydrogen, C.sub.1 -C.sub.20 alkyl optionally substituted by hydroxyl, C.sub.1 to C.sub.4 alkoxy, amino, C.sub.1 to C.sub.10 alkylamino or di(C.sub.1 to C.sub.10 alkyl)amino, C.sub.5 to C.sub.10 cycloalkyl, or phenyl optionally substituted by C.sub.1 to C.sub.4 alkyl, C.sub.1 to C.sub.4 alkoxy or halogen, or R.sup.1 and R.sub.2 together with the indicated nitrogen atom denote a five-, six- or seven-membered heterocyclic ring, or R.sup.1 and R.sup.2 together denote a group of formula ##STR2## R.sup.3 is an o-phenylene group optionally substituted by C.sub.1 to C.sub.4 alkyl, C.sub.1 to C.sub.4 alkoxy, nitro or halogen, and m has an average value of 1 to 5, and (C) at least one anionic surfactant selected from (i) a monovalent metal or ammonium salt of an organic sulfonic acid, (ii) a sulfate half-ester of an alcohol or a monovalent metal or ammonium salt thereof, (iii) a sulfosuccinic acid ester or a monovalent metal or ammonium salt thereof, (iv) a sulfosuccinamic acid or a monovalent metal or ammonium salt thereof or (v) an aminosulfonic acid or a monovalent metal or ammonium salt thereof.

Phthalocyanine pigment compositions

The present invention provides a process for the production of dimethylaminomethyl copper phthalocyanine having an average of 1 to 4 dimethylaminomethyl groups per molecule which comprises reacting aminomethyl copper phthalocyanine having an average of 1 to 4 aminomethyl groups per molecule with formaldehyde and aqueous formic acid at a concentration of 2 to 60%, at atmospheric pressure, and at an elevated temperature.

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Glasgow, United Kingdom

Ian A Lambie