Grinding of crude phthalocyanines to pigments using a...

Details Grinding of crude phthalocyanines to pigments using a... Grinding of crude phthalocyanines to pigments using a...

C - Chemistry, Metallurgy

09

B

260/199

C09B 47/04 (2006.01) C09B 67/00 (2006.01)

Patent

CA 1045125

CONVERSION OF CRUDE PHTHALOCYANINES INTO PIGMENTS Abstract of the Disclosure A salt grinding process is described for converting crude phthalocyanines into pigments having improved strength, cleanli- ness and transparency. The process is carried out by grinding an anhydrous charge of dry phthalocyanines crude, salt grinding aid, organic liquid conditioning agent and a specified amount of an alkali metal hydroxide under conditions of shear and then recover- ing the pigment from the charge. The process is particularly use- ful for crudes of unsubstituted or halogen substituted copper phthalocyanines.

238540

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