Process for coating metal flakes
Abstract
Abstract METALS FLAKES, PARTICULARLY FLAKES OF COPPER OR COPPER ALLOYS, ARE ADMIXED WITH A WATER-IN-OIL EMULSIONS WHEREIN THE AQUEOUS PHASE IS A SOLUTION OF A POLYVALENT METAL ACID PHOSPHATE SALT SUCH AS ZINC AND/OR ALUMINUM ACID PHOSPHATE, AND THE EMULSION IS EVAPORATED OFF TO PROVIDE THE FLAKES WITH AN OXIDATION RESISTANT 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 PRODUCED AN 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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