Conditioning process for phthalocyanine pigments

Details Conditioning process for phthalocyanine pigments Conditioning process for phthalocyanine pigments

C - Chemistry, Metallurgy

09

B

C09B 47/04 (2006.01) C09B 67/12 (2006.01)

Patent

CA 2119301

CONDITIONING PROCESS FOR PHTHALOCYANINE PIGMENTS ABSTRACT OF THE DISCLOSURE The present invention relates to a process for preparing a beta-phase metal phthalocyanine pigments in which (a) a crude metal phthalocyanine having an average particle size of about 10 to about 200 µm is dry milled until the average particle size is reduced to about 0.01 to about 0.5 µm; (b) the milled metal phthalocyanine is finished by thoroughly mixing said metal phthalocyanine with at least about 4 parts by weight, relative to the metal phthalocyanine, of a finishing solvent containing a mixture of (i) about 5 to 100 percent by weight, based on the total amount of finishing solvent, of a monocarboxylic acid monoester, dicarboxylic acid diester, diol diester, lactone, or cyclic carbonate, or a mixture thereof, and (ii) 0 to about 95 percent by weight, based on the total amount of finishing solvent, of water; (c) the ester used in step (b) is hydrolyzed; and (d) the beta-phase metal phthalocyanine pigment is collected.

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