| 摘要 |
A fast curing, high solids coating composition which upon curing forms a hard, glossy, durable coating exhibiting excellent resistance to solvents and water. The coating composition which is particularly adapted for use as an automotive topcoat, contains greater than about 60 percent by weight of nonvolatile solids and, exclusive of pigments, solvents and other nonreactive components, consists essentially of: (A) a polyepoxide resin having a number average molecular weight (Mn) of between about 140 and about 3,000; (B) a reactive catalyst comprising at least one oligomeric hydroxy functional organophosphate ester selected from certain mono- and diesters of phosphoric acid; (C) an amine-aldehyde crosslinking agent; and (D) optionally, a hydroxy functional additive. The oligomeric hydroxy functional organophosphate ester is included in the composition in an amount sufficient to provide between about 0.8 and about 1.5 equivalents of acid functionality for each equivalent of epoxy functionality in the polyepoxide resin and the amino crosslinking agent is included in the composition in an amount sufficient to provide at least about 0.4 equivalents of nitrogen crosslinking functionality for each equivalent of hydroxy functionality included in the composition.
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