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US 5,330,839 AGranted
Electrocoating composition containing blocked isocyanate, dialkyltin aromatic carboxylate and a bismuth or zirconium compound
AssigneeKansai Paint Co., Ltd.
InventorsYoshio Yasuoka, Masafumi Kume, Tadayoshi Hiraki, Kiyoshi Kato, Hidehiko Haneishi, Masato Yamamoto
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Abstract
A blocked isocyanate group-containing electrocoating composition comprising at least one dialkyltin aromatic carboxylate and at least one bismuth or zirconium compound as a combined curing catalyst. This electrocoating composition gives an electrocoating film superior in corrosion resistance and low-temperature curability and has good bath stability over an extended period.
Claims12
A blocked isocyanate group-containing electrocoating composition which consists essentially of:
- (A) a blocked isocyanate group-containing vehicle resin selected from the group consisting of self-crosslinking amine-epoxy resin adduct vehicle resins having a blocked isocyanate group and an active hydrogen in their molecules, and external crosslinking vehicle resin compositions consisting essentially of (1) an amine-epoxy resin adduct and (2) a blocked isocyanate compound,
- (B) at least one dialkyltin aromatic carboxylate represented by the following formula (I) or (II) ##STR3## wherein R.sub.1 represents an alkyl group having 1-12 carbon atoms and R.sub.2 represents a hydrogen atom or an alkyl group having 1-4 carbon atoms, and
- (c) at least one bismuth or zirconium compound.
Dependencies are inferred from the claim text.