Patent ID: 6506244
Filing Date: 2003-01-14
Classification: C09B,G03G,G11B

Abstract:
A process for the preparation of a pigment through kneading of a crude phthalocyanine compound with a water-soluble crystalline inorganic salt in the presence of an organic liquid, then adding water, filtrating and washing to separate said pigment from said salt, then drying said pigment, in whichsaid phthalocyanine compound is a compound or a mixture of compounds of formula â€ƒwherein M is two hydrogens or Zn(II), Fe(II), Ni(II), Ru(II), Rh(II), Pd(II), Pt(II), Mn(II), Be(II), Ca(II), Ba(II), Cd(II), Hg(II), Sn(II), Co(II), Pb(II), V(IV)O, Mn(IV)O, Zr(IV)O, Ti(IV)O, Fe(III)Cl, In(III)Cl, Ce(III)Cl, Al(III)OH, Cr(III)OH, Bi(III)OH or Zr(IV)(OH)2, with the proviso that each X independently from all others is hydrogen or halogen; and said organic liquid is water-soluble and has a pka or pkb of from 5.5 to 8.5 and at least one oxy or oxo group in its molecule.