C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
6/198
C09B 67/04 (2006.01) C09B 67/00 (2006.01) C09B 67/12 (2006.01) C09B 67/22 (2006.01)
Patent
CA 1134105
Case 3-12381/MA 1755/+ A PROCESS FOR THE PRODUCTION OF A PIGMENT COMPOSITION ABSTRACT OF THE DISCLOSURE . A process for the production of a pigment composition useful in pigmenting surface coating comprising: (a) milling a crude copper phthalocyanine blue pigment in the presence of 0-50% (by weight of milled material) of a salt; and (b) subsequently treating the milled material with a polar aliphatic solvent; whereby (c) 8 to 12% by weight, based on crude pigment, of a copper phthalocyanine additive of the formula I Image ( I ) wherein CuPc is the residue of copper phthalocyanine, m and n are each an integer of from 1 to 4, and R1 and R2 are each an alkyl group having 1 to 4 carbon atoms, or R1 and R2, to- gether with the N atom to which they are bonded, form a heterocycle, is added to the crude milled pigment prior to, during or after the solvent treatment of step (b); and, (d) the pigment composition is then isolated.
353137
Barraclough Ronald
Langley Robert
Ciba Specialty Chemicals Holding Inc.
Fetherstonhaugh & Co.
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