Rust inhibiting coating compositions
AssigneeICI Americas Inc.
InventorErich Kuehn
Life of this patent
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Abstract
Paint formulations containing barium salts of hydroxy acids such as citric, tartaric, salicyclic, alizarine, quinizarine, and chloranilic in their anhydrous or hydrated forms are useful as primer coats for inhibiting rust for time periods equivalent to or better than those primers containing oxides and salts of lead. Barium salt mixtures, coprecipitated blends and barium salt coated substrates are particularly useful as paint additives.
Claims11
In a corrosion-inhibiting coating composition for metallic surfaces which consists essentially of a film forming binder system selected from the group consisting of an acrylic resin, alkyd resin, epoxy resin, polyvinyl acetate, rubber latex and chlorinated rubber, and a corrosion-inhibiting agent;
- the improvement consisting of having dispersed therein, as said corrosion-inhibiting agent, a substantially water insoluble barium salt of an organic carbonyl group containing compound having 2-40 carbon atoms and at least one acidic hydrogen, said compound being selected from the group consisting of aliphatic and aromatic compounds having at least one hydroxyl group in the beta position to at least one carbonyl group when separated by saturated carbon linkages according to the following structure:
- ##STR2## at least one hydroxyl group in the gamma position to at least one carbonyl group when separated by an ethylenically unsaturated carbon linkage according to the following structure:
- ##STR3## and at least one hydroxyl group in the .beta., .DELTA. or .gamma. positions to at least one carbonyl group when separated by aromatic unsaturation according to the following structure:
- ##STR4## and wherein said carbonyl group is present as part of an aldo, keto, carboxyl, carboxy ester or amido group and wherein said barium salts are precipitated from solutions of basic barium compounds.
A pigment for use in corrosion inhibiting surface coatings which comprises a particulate substrate having deposit thereon a substantially water insoluble barium salt of an organic carbonyl group containing compound having 20-40 carbon atoms and having at least one acidic hydrogen said compound selected from the group consisting of an aliphatic and aromatic compound having at least one hydroxyl group in a .beta. position to at least one carbonyl group and separated by saturated carbon linkages according to the following structure:
- ##STR5## at least one hydroxyl group in the .gamma. position to at least one carbonyl group when separated by an ethylenically unsaturated linkage according to the following structure:
- ##STR6## and at least one hydroxyl group in the .beta., .DELTA. or .gamma. positions to at least one carbonyl group when separated by aromatic unsaturation according to the following structure:
- ##STR7## and wherein said carbonyl group is present as part of an aldo, keto, carboxyl, carboxy ester or amido group.
Dependencies are inferred from the claim text.