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US 5,494,954 AGranted
Non-aqueous dispersion polymerization and stabilization of polar polymeric microparticles
AssigneePPG Industries, Inc.
InventorsSuryya K. Das, Soner Kilic
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Abstract
An organic colloidal dispersion of polar polymeric microparticles synthesized directly in a non-aqueous polar medium is disclosed. The dispersion is particularly useful for controlling rheological properties such as sag and metallic flake orientation in coating compositions.
Claims18
A non-aqueous colloidal dispersion comprising:
- (a) polar polymeric microparticles which are the product of dispersion polymerization of acrylic monomers in a non-aqueous polar polymerization medium selected from the group consisting of esters, ketones, and mixtures thereof, in the presence of a polymeric acrylic dispersant which is free of polymerizable unsaturation and which is soluble in said polymerization medium, said acrylic monomers comprising on a weight basis of total monomers and crosslinkers:
- (i) 50 to 100 percent of vinyl monomers selected from the group consisting of acrylic acid, methacrylic acid, beta-carboxyethyl acrylate, 2-hydroxyethyl acrylate, acrylonitrile, and mixtures thereof;
- (ii) 0 to 15 percent vinyl monomers other than those in (i);
- and
- (iii) 0 to 50 percent crosslinkers;
- whereby the product of the polymerization is insoluble in the polymerization medium;
- and
- (b) non-aqueous dispersion solvent which may be the same as or different from the polymerization medium.
5 more elements
Dependencies are inferred from the claim text.