Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent
1975-05-09
1977-06-07
Robinson, Ellis
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
428212, 428218, 428323, 428327, 428328, 428413, 428418, 428457, 428461, 428523, B23P 300, B32B 702, B32B 1508
Patent
active
040273660
ABSTRACT:
A process for electrostatically applying a multilayered coating on a substrate in one operation or step is disclosed, wherein a mixture of powders of at least two different coating materials is used as the coating composition, each powder, in the case of non-conducting powders, differing from the others in dielectric constant by a factor of at least 0.1, and the powders being of substantially different specific gravities, with the components having the lowest dielectric constant value having the lowest specific gravity value.
At least one of the powders will be a powder of a film-forming non-conductive organic or inorganic polymer. Upon electrostatically applying a coating of this powdered composition to a conductive substrate which has a neutral charge or a charge opposite from that of the coating composition powder particles, the powders stratify into distinct layers of different compositions. The powders adhere to the substrate because of contact or static electrification for a reasonable length of time and until at least one of the powders can be cured or fused to form the final coating.
Thus, for instance, in only one pass with an electrostatic spray gun, a protective coating of superimposed layers of zinc, epoxy, and polyethylene can be applied to a conductive substrate.
REFERENCES:
patent: 2958611 (1960-11-01), Ulrich
patent: 3140195 (1964-07-01), Nagel
patent: 3397046 (1968-08-01), Greyson
patent: 3505099 (1970-04-01), Neuroth
patent: 3708321 (1973-01-01), Spieles
Millar John M.
Moran William F.
Beatrice Foods Co.
Robinson Ellis
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