Anionic electrocoat compositions containing epoxy phosphates
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United States of America Patent
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Sep 18, 1990
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N/A
app pub date -
Feb 21, 1990
filing date -
Apr 3, 1986
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Abstract
Thermosetting aqueous anionic electrocoating composition are disclosed which comprise a carboxyl-functional anionic polymer dispersed in water with the aid of water miscible organic solvent and a volatile base, and from about 1% to about 5%, based on the weight of the polymer content of the composition, of an oxirane-free epoxy phosphate, this epoxy phosphate being produced by slowly and incrementally adding a resinous polyepoxide to a solvent solution containing from 0.05 to 0.9 mole of orthophosphoric acid per oxirane equivalent in the polyepoxide together with sufficient water to hydrolyze all of the oxirane functionality which is not consumed by the orthophosphoric acid. These epoxy phosphates improve the corrosion resistance of electrodeposited cured coatings without objectionably wrinkling their surface.
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