Transforming crude copper phthalocyanines into a pigmentary stat

Details Transforming crude copper phthalocyanines into a pigmentary stat Transforming crude copper phthalocyanines into a pigmentary stat

1989-06-23

1991-04-09

Dixon, Jr., William R.

Compositions: coating or plastic

Materials or ingredients

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

106412, 106480, C09B 6750

Patent

active

050061739

ABSTRACT:
Crude copper phthalocyanines are transformed into a pigmentary state by treating finely divided but imperfectly crystallized and highly aggregated crude copper phthalocyanines having a primary particle size, produced by ball milling, or less than 0.1 .mu.m with an organic solvent by subjecting a suspension of the organic solvent and the milled crude copper phthalocyanine (hereinafter referred to as the solvent/pigment suspension), which has a pigment concentration of from 15 to 55% by weight and a solvent concentration of from 15 to 85% by weight and which may contain water in a concentration of from 0 to 30% by weight, to a shear gradient of from 1000 to 20000 s.sup.-1 for a period of from 2 to 1000 s with an energy uptake during shearing of from 0.01 to 0.02 kWh/kg of pigment throughput, then metering water into the solvent/pigment suspension in an amount of from 0.1 to 10 times the amount of the solvent, to effect a defined discontinuation of the conditioning process, and finally mixing the suspension until homogeneous.

REFERENCES:
patent: 3351481 (1967-11-01), Hopmeier et al.
patent: 3370065 (1968-02-01), Nold et al.
patent: 3951678 (1976-04-01), Wanser
patent: 3985767 (1976-10-01), Nicaise et al.
patent: 4239685 (1980-12-01), Pigasse
patent: 4289698 (1981-09-01), Stepp
patent: 4386966 (1983-06-01), Fitzgerald

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