Ciba-geigy Corporation

Ciba Specialty Chemicals Corporation

John B Blackburn

Alexander M Irvine

Paul Kerwin

Alexander Hamilton

David McGregor

George McLaren

Michael Sutcliffe

The present invention provides the use of a resinated pigment in which from 10 to 100% of the resinated proportion of the product is a resin ester, as colourant in a lithographic printing ink.

Pigment compositions

A pigment composition, suitable for use in modern offset and letter press inks, comprising:

Pigment compositions based on acetoacetarylide derivatives

Copper phthalocyanine derivatives of the formula ##STR1## or mixtures thereof wherein CuPc is optionally substituted copper phthalocyanine, n is a value from 1 to 4, X is hydrogen, 1-4C alkyl, 1-4C alkoxy or halogen, and R is linear or branched alkyl of 1 to 22 C-atoms which may be substituted with one or more alkoxy, dialkylamino or alkylthio, the alkyls having 1 to 22 C-atoms, or arylalkyl, the alkyl having 1 to 4 C-atoms and the aryl being optionally substituted by one or more non-water solubilizing groups, which incorporated into a phthalocyanine pigment, provide excellent flocculation resistance in paint and printing ink media.

Copper phthalocyanine derivatives

Copper phthalocyanine derivatives of the formula ##STR1## or mixtures thereof wherein CuPc is optionally substituted copper phthalocyanine, n is a value from 1 to 4, X is hydrogen, 1-4 C alkyl, 1-4 C alkoxy or halogen, and R is linear or branched alkyl of 1 to 22 C-atoms which may be substituted with one or more alkoxy, dialkylamino or alkylthio, the alkyls having 1 to 22 C-atoms, or arylalkyl, the alkyl having 1 to 4 C-atoms and the aryl being optionally substituted by one or more non-water solubilizing groups, which incorporated into a phthalocyanine pigment, provide excellent flocculation resistance in paint and printing ink media.

A process of producing a phthalocyanine pigment comprising dry grinding a crude phthalocyanine, stirring the ground product with an aqueous medium containing a surfactant and isolating the pigmentary product which, when dispersed into surface coating media, provide colorations having high brillance and depth of shade.

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Beith, United Kingdom

John B Blackburn