Non-Micronized Pigment for Plastics Application
AssigneeCristal Inorganic Chemicals Switzerland Ltd
InventorsModasser El-Shoubary, Lee Chris Mundle
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Abstract
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.
Claims19
A process for loading particulate pigment into a polymer concentrate, the process comprising the steps of:
- (a) adding a basic pH aqueous solution comprising a water soluble organic salt to a milled particulate pigment comprising titanium dioxide to form an organic-coated particulate pigment;
- and
- (b) 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.
Dependencies are inferred from the claim text.