Process for coating metal flakes
Abstract
Abstract METAL FLAKES, PARTICULARLY FLAKES OF COPPER OR COPPER ALLOYS, ARE ADMIXED WITH WATER-IN-OIL EMULSIONS WHEREIN THE AQUEOUS PHASE IS A SOLUTION OF A POLYVALENT METAL ACID PHOSPAHTE SALT SUCH AS ZINC AND/OR ALUMINUM ACID PHOSPHATE, AND THE EMUILSION IS EVAPORATED OFF TO PROVIDE THE FLAKES WITH AN OXIDATION RESISANT METAL ACID PHOSPHATE COATING. ON TREATMENT OF THE COATED FLAKES, EITHER IN THE ORIGINAL ADMIXTURE OR AFTER SEPARATION FROM THE EMULSION, WITH A POLYVALENT METAL COMPOUND, SUCH AS CALCIUM OXIDE. THERE IS PRODCUED AD OXIDATION- AND WATER-RESISTANT COATING. THE RESULTING PRODUCT MAY BE TREATED WITH ADDITIONAL STABILIZING MATERIALS, SUCH AS VINYL STABILIZERS OR CHELATING AGENTS.
Inventors
- 👤 Carleton R Bradshaw
- 👤 Hal-Curtis Felsher
Bibliographic Details
Claims Analysis
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