Non-micronized pigment for plastics application

摘要

A cost-effective process for loading particulate pigment into a polymer concentrate includes adding a basic pH aqueous solution having a water soluble organic salt to a milled particulate pigment to form an organic-coated particulate pigment. The pH of the basic aqueous solution is sufficiently basic that the water soluble organic salt remains in a salt form. Without a prior micronization step, the organic-coated particulate pigment is mixed with a polymer resin to form a polymer concentrate having from about 50% to about 87% by weight particulate pigment with dispersibility comparable to micronized organic-coated particulate pigment.

主权项

1. A process for loading particulate pigment into a polymer concentrate, the process comprising the steps of:
(a) milling an oxidizer discharge slurry of particulate pigment comprising titanium dioxide; (b) adding a basic pH aqueous solution comprising a water soluble organic salt to the milled particulate pigment comprising titanium dioxide to form an organic-coated particulate pigment, wherein the pH of the basic aqueous solution is sufficiently basic to maintain the water soluble organic salt in a salt form both before and after addition to the milled particulate pigment; and (c) without a prior micronization step, mixing the organic-coated particulate pigment with a polymer resin to form a polymer concentrate having from about 50 wt % to about 87 wt % particulate pigment with dispersibility comparable to micronized organic-coated particulate pigment.