Polyurethane self-priming topcoats
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsCharles R. Hegedus, Donald J. Hirst, Anthony T. Eng
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Abstract
A corrosion-resistant coating which can be applied directly to a surface as self-priming topcoat comprising a polyurethane resin binder and a combination of pigments consisting essentially of a molybdate-modified zinc phosphate, zinc salts of benzoic acids, and an alkaline earth metal phosphate such as zinc-barium phosphate. In addition, the coating contains up to about 35 parts by weight of a titanium dioxide pigment, up to about 3.0 parts by weight of an oil soluble dispersant agent and up to about 50 parts by weight of at least one organic solvent.
Claims15
A corrosion-resistant self-priming coating comprising from about 20 to 60 parts by weight of a polyurethane resin binder, 5 to 35 parts by weight of an alkaline earth metal phosphate, 0.5 to 5 parts by weight of a zinc benzoate, 5 to 30 parts weight of a metal molybdate-modified zinc phosphate, 5.0 to 35 parts by weight of titanium dioxide, 0 to 3.0 parts by weight of an oil soluble dispersing agent and 0 to 50 parts by weight of at least one organic solvent.
Dependencies are inferred from the claim text.