Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1977-12-15
1978-09-26
Griffin, Ronald W.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 19EP, 260 23EP, C09D 376
Patent
active
041169018
ABSTRACT:
Low temperature curing aqueous coatings are provided in which the resin solids are constituted by an epoxy ester of a resinous polyepoxide with at least about 0.2 mole of monocarboxylic acid containing conjugated unsaturation per epoxy equivalent in the polyepoxide and at least about 0.5 mole of monocarboxylic acid containing nonterminal nonconjugated unsaturation per epoxy equivalent in the polyepoxide. This epoxy ester is substantially free of epoxy groups and is copolymerized in solvent solution with monoethylenic monomers containing terminal unsaturation, including carboxyl-functional monomers and preferably also monomer providing a primary hydroxy group, and then precondensed with a phenolic resin to provide a non-gelled, solvent-soluble copolymer-phenolic condensate having carboxyl-functionality and residual ethylenic unsaturation. The carboxyl-functionality of the copolymer allows it to be dispersed in water with the aid of a base, and the residual ethylenic unsaturation enables an oxidative cure to supplement the cure with the phenolic resin and this minimizes curing temperature at the same time that the cure is maximized to provide better salt spray and detergent resistance than would otherwise be obtainable.
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Sekmakas Kazys
Shah Raj
DeSoto, Inc.
Griffin Ronald W.
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