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US 6,306,938 B1Granted
Production process
AssigneeCiba Specialty Chemicals Corporation
InventorsRichard Ernest Mathers, David Keirs, Kenneth Grant Dykes, Thomas Healy
Life of this patent
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Abstract
The present invention provides a process for the production of pigmentary copper phthalocyanine in the beta crystalline phase comprising: a) dry or aqueous milling of crude copper phthalocyanine in combination with a natural or chemically modified resin and, optionally, a grinding auxiliary followed by; b) isolation of the milled mass followed by; c) conditioning treatment of the milled mass.
Claims35
A process for the production of pigmentary copper phthalocyanine in the beta crystalline phase comprising:
- a) dry or aqueous milling of crude copper phthalocyanine in combination with a natural or chemically modified resin and, optionally, a grinding auxiliary followed by;
- b) isolation of the milled mass followed by;
- c) conditioning treatment of the milled mass in an aqueous polar solvent in the presence of hydroxide anions, the proportion of water to polar solvent being such that there is no phase separation, and said solvent being selected from solvents capable to form an azeotropic mixture with water.
Dependencies are inferred from the claim text.