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US 3,941,584 AGranted
Production of reflective metal flake pigments
AssigneeThe International Nickel Company, Inc.
InventorsJohn Hayes Tundermann, John Herbert Harrington
Life of this patent
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Abstract
Directed to a metal flake powder of a stain-resistant metal or alloy and a process for producing the same wherein a metal powder of -100 mesh size is ball milled in a mobile liquid medium wherein the ratio of mobile liquid to powder being milled is at least about 10 to 1, e.g., about 25:1 to about 50:1.
Claims9
A metal flake powder consisting essentially of solid opaque flakes of metal each flake having a thickness of less than one micron;
- said flakes having essentially smooth, defect free, mechanically formed faces with major dimensions of about 10 to 40 microns;
- said powder being capable of being formed as a water floated layer and exhibiting, when formed as a water floated layer of minus 325 mesh particles a high specular reflectance of at least 30 percent as measured by aiming a beam of parallel light rays generated by a tungsten filament light source at an angle of 30.degree. from the vertical and detecting the specularly reflected light, as affected by the absorption characteristics of the material tested, by a photo cell sensitive in the range of 300 to 700 millimicrons wavelength;
- and said metal flakes being coated with a thin lubricant film adapted to provide leafing characteristics to said flakes when said lubricant film is not wetted by a coating composition vehicle and to provide non-leafing characteristics to said flakes when said lubricant film is wetted by a coating composition vehicle.
Dependencies are inferred from the claim text.