Conversion of crude phthalocyanine blue from red to green shade

Details Conversion of crude phthalocyanine blue from red to green shade Conversion of crude phthalocyanine blue from red to green shade

1999-03-19

2000-12-05

Green, Anthony

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106410, 106411, 106413, 540122, C09B 4704, C09B 4730

Patent

active

061561169

ABSTRACT:
A method for converting crude phthalocyanine blue from red to green by milling a dispersion of the crude phthalocyanine and an aqueous medium containing a particulate grinding aid and a surfactant grinding aid composition characterized by employing a surfactant grinding aid composition comprising an acetylenic diol surfactant of the general formulas I and II: ##STR1## where R.sup.1 and R.sup.2, which may be the same or different, are C1-C8 alkyl, R.sup.3 is hydrogen or methyl, R.sup.4 is hydrogen, methyl, ethyl, or any combination thereof, and m+n=an average value from 1 to 100.

REFERENCES:
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patent: 4427810 (1984-01-01), Chisvette et al.
patent: 4694078 (1987-09-01), Langley et al.
patent: 4801634 (1989-01-01), Langley et al.
patent: 4801638 (1989-01-01), Langley et al.
patent: 4981888 (1991-01-01), Langley et al.

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