Pigments with improved dispersibility
AssigneeSun Chemical Corporation
InventorsJohn Britanak, Mark W. Johnson, Zhijian Shen, Richard Kent Faubion
Life of this patent
Estimating the term…
Abstract
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.
Claims9
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.
Dependencies are inferred from the claim text.