Storage stable water-dilutable acid adducted epoxy based coating for metal food contact surfaces
AssigneeMobil Oil Corporation
InventorsRonald W. Anderson, Richard A. Lamanna
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Abstract
A resin is provided which is the adduct of a monocarboxylic acid and a diglycidyl ether of a bisphenol, or of a monocarboxylic acid, a bisphenol, and a diglycidyl ether of a bisphenol, reacted with an anhydride to an Acid No. of 35 to 150. This resin is solubilized with a volatile amine, ammonia, or NH.sub.4 OH in a solvent mixture of water, alkoxyethanols, alcohols, and alkyl ethers of diethylene glycol and combined with an aminoplast to produce a coating composition utilizable to coat surfaces that will contact a food or beverage, such as in metal packaging containers.
Claims19
A water-solubilizable resin prepared in the absence of dicarboxylic acid consisting essentially of (A) an adduct of a monocarboxylic acid having between 8 and 18 carbon atoms and a diglycidyl ether of a bisphenol, or (B) of a monocarboxylic acid having between 8 and 18 carbon atoms, a bisphenol, and a diglycidyl ether of a bisphenol, in an equivalent ratio of total monocarboxylic acid and bisphenol, to diglycidyl ether between about 1:1 and about 1.2:1;
- (A) or (B) being further adducted with an anhydride selected from the group consisting of trimellitic anhydride, succinic anhydride, methyl succinic anhydride, tricarballylic anhydride, phthalic anhydride, hexahydrophthalic anhydride, and maleic anhydride, in an amount sufficient to provide an acid number between about 35 and about 150.
Dependencies are inferred from the claim text.