Pigments with improved dispersibility

摘要

A method for preparing a pigment composition for a plastics colorant is disclosed. The pigment composition is prepared by mixing a press cake of the pigment with a liquid containing a selected type of dispersant before the resulting slurry is dried. Thus prepared pigment composition has improved dispersibility in a thermoplastic or thermoset resin and greatly reduces the filter pressure rise in the molding systems for preparing masterbatches or various plastic compositions for molding, fiber, film and sheet.

主权项

1. A method for preparing a pigment composition for a plastics colorant, comprising
(i) providing a pigment press cake, (ii) mixing the press cake with a dispersant and with water, a water miscible solvent or a mixture thereof; and (iii) drying the mixture, wherein the dispersant is poly(oxyalkylene) modified phthalocyanine, and poly(oxyalkylene) is connected to phthalocyanine by a covalent bond.