Ciba-geigy Corporation

Ian Robert Wheeler

George Heddle Robertson

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.

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Houston, United Kingdom

Ian Robert Wheeler