Ciba-geigy Corporation

George Heddle Robertson

John Andrew Stirling

Ian Robert Wheeler

A phthalocyanine pigment composition comprising a phthalocyanine pigment and a sulphonated phthalocyanine derivative formed from sulphonated phthalocyanine dyestuffs having the formula: ##STR1## AND A SUFFICIENT QUANTITY OF DEHYDROABIETYLAMINE HAVING THE FORMULA ##STR2## to substantially neutralize the free sulphonic acid groups, wherein R represents a C.sub.1 -C.sub.22 cyclic or acyclic alkyl group, aryl, aralkyl group or a dehydroabietylamine residue; and R.sub.1 represents hydrogen or a C.sub.1 -C.sub.22 cyclic or acyclic alkyl group, an aryl or an aralkyl group; the alkyl, cycloalkyl, aryl or aralkyl groups, R and R.sub.1 may be optionally substituted with one or more hydroxyl groups; x is from 1 to 4, y is 0 or from 1 to 3 and the sum of x + y is from 1 to 4 gives printing inks and paint media having improved tinctorial strength, gloss and especially improved rheological properties.

Pigment compositions

Pigment dispersions

Pigment composition in the form of free-flowing, non-dusting, non-aggregating, non sticky generally spherical beads which comprises from 50 to 80% by weight of a pigment or water insoluble dyestuff from 5 to 40% by weight of a normally solid water-insoluble organic compound carrier or mixture of carriers melting below 100.degree. C, from 2.5 to 25% of an organic acid and from 1.5 to 25% of an organic base, the amount of acid plus base being from 5 to 35% by weight of the total composition in which are compatible with inks, paints and plastics, and can be readily incorporated into the same.

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Paisley, United Kingdom

George Heddle Robertson