Conversion of crude phthalocyanines into pigments

Details Conversion of crude phthalocyanines into pigments Conversion of crude phthalocyanines into pigments

1974-11-04

1976-02-03

Douglas, Winston A.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

C09B 4704

Patent

active

039363155

ABSTRACT:
A salt grinding process is described for converting crude phthalocyanines into pigments having improved strength, cleanliness and transparency. The process is carried out by grinding an anhydrous charge of dry phthalocyanine crude, salt grinding aid, organic liquid conditioning agent and a specified amount of an alkali metal hydroxide under conditions of shear and then recovering the pigment from the charge. The process is particularly useful for crudes of unsubstituted or halogen substituted copper phthalocyanines.

REFERENCES:
patent: 2723981 (1955-11-01), Tullsen
patent: 3201051 (1965-08-01), Manger et al.
patent: 3351481 (1967-11-01), Hopmeier et al.
patent: 3353977 (1967-11-01), Kranz et al.
patent: 3437503 (1969-04-01), Massam et al.
patent: 3523030 (1970-08-01), Malin et al.
patent: 3647496 (1972-03-01), Bagai et al.
patent: 3748164 (1973-07-01), Akamatsu et al.
patent: 3752688 (1973-08-01), Fuchs et al.
patent: 3758320 (1973-09-01), Flores

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