Process for conditioning a phthalocyanine pigment

Details Process for conditioning a phthalocyanine pigment Process for conditioning a phthalocyanine pigment

C - Chemistry, Metallurgy

09

B

260/199.5

C09B 47/04 (2006.01) C09B 47/26 (2006.01) C09B 67/00 (2006.01) C09B 67/22 (2006.01)

Patent

CA 1136127

ABSTRACT OF THE DISCLOSURE A process for conditioning pigments which comprises grinding a crude copper phthalocyanine pigment and a crystallising solvent in the absence of inorganic salt but in the presence of one or more sulphonated phthalocyanine amine derivatives having the general formula I Image (I) wherein Pc represents a metal or metal free phthalocyanine, R1, R3 and R4 are the same or different and may each be hydrogen, or a residue containing 1 to 22 carbon atoms, and R2 is a residue containing 1 to 22 carbon atoms, with the proviso that the total number of carbon atoms in the sum of R1, R2, R3 and R4 is not greater than 66, p is 0 to 3, q is 1 to 4 and the sum of p and q is 1 to 4 is provided. The resulting pigment composition is freely dischargeable from the mill in high yield and is, moreover largely in the .beta.-form.

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