Colored metallic pigments
AssigneeSilberline Manufacturing Co., Inc.
InventorsCraig B. Keemer, Walter S. Halbach, William G. Jenkins, Russell L. Ferguson
Life of this patent
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Abstract
A colored metallic pigment composition includes metallic particles which have been treated with a mixture of pigment particles and wax. A polymeric shell is formed on the treated metal particles by means of an organometallic coupling agent. The coupling agent includes a readily-hydrolyzable group which is capable of binding to the metal particle surface, and a relatively non-hydrolyzable group which serves as a binding site for the polymeric shell.
Claims12
A colored metallic pigment composition, comprising:
- a metallic particle;
- a pigment dispersion comprising colored pigment particles dispersed in a wax, adsorbed on part of the surface of the metallic particle;
- an organometallic coupling agent bound to the surface of the metallic particle through a readily hydrolyzable group;
- and
- a polymeric shell, the coupling agent having a relatively non-hydrolyzable group which serves as a binding site for the polymeric shell.
A method of making colored metallic particles comprising
- dispersing colored pigment particles and a wax to form a pigment dispersion;
- mixing metallic particles and the pigment dispersion together to adsorb the mixture onto part of the surfaces of the metallic particles to form treated metallic particles;
- adding an organometallic coupling agent, said organometallic coupling agent comprising at least one readily hydrolyzable group and at least one relatively non-hydrolyzable organic group so that the coupling agent bonds to the surface of the treated metallic particles through reaction at the particle surface with the readily hydrolyzable organic group and the non-hydrolyzable organic group remains and serves as a site to bind the treated metallic particle to a polymeric shell;
- adding one or more monomers containing polymerizable double bonds, at least one of which contains at least three polymerizable double bonds, and a polymerization initiator;
- and
- polymerizing the monomer or monomers to provide the treated metallic particles with polymeric shells.
Dependencies are inferred from the claim text.