METHOD OF IMPROVING STORAGE STABILITY OF PIGMENTS

摘要

P-18755/A/MA 2039 Method of Improving Storage Stability of Pigments A method of improving the storage stability of a coloured organic pigment in powder form which comprises coating pigment particles with a solid polymer which is a polar group - containing vinyl polymer, said polar group being a hydroxy, carboxyl, carboxylic ester, anhydride or carboxamide group, or a cellulosic polymer, thereby inhibiting reduction of tinting strength of the pigment on storage.