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 an alkaline earth metal metaborate, zinc salts of benzoic acids, and an alkaline earth metal phosphate such as zinc-barium phosphate. In addition, the coating contains from 5-40 parts by weight of a titanium dioxide pigment, up to about 3.0 parts by weight of an oil soluble dispersant and up to about 50 parts by weight of at least one organic solvent.
Claims4
A process of preparing a corrosion-resistant self-priming urethane coating on a substrate which comprises forming the polyurethane coating by applying onto the substrate at ambient temperatures an organic coating of 0.5 to 10 mils;
- said coating comprising from about 25 to 55 parts by weight of a polyurethane binder, 1 to 30 parts by weight of an alkaline-earth metal phosphate, 0.1 to 5.0 parts by weight of a zinc benzoate, 5 to 35 parts by weight of an alkaline earth metal metaborate, 5 to 40 parts by weight of titanium dioxide pigment, 0 to 3.0 parts by weight of an oil soluble dispersing agent and 0 to 50 percent by weight of at least one organic solvent.
Dependencies are inferred from the claim text.