| 摘要 |
A novel crosslinkable coating composition suitable for use in cathodic electrodeposition of coating to retard corrosion of substrates is provided, which coating composition comprises: A. crosslinkable resin, optionally at least partially neutralized, comprising the reaction product of: (a) substantially non-gelled epoxy-modified polybutadiene, comprising the reaction product of: (i) diamine functionalized polybutadiene reactant of number average molecular weight about 500 to about 5000; with (ii) monoepoxide reactant of number average molecular weight about 30 to about 500; and with (iii) diepoxide reactant of number average molecular weight about 100 to about 1000; the diamine functionalized polybutadiene reactant bearing two secondary amine functionality and being reacted with said monoepoxide reactant and diepoxide reactant in relative molar ratio of about 1:0.9-1.1:0.9-1.1, respectively; with (b) di- or polyhydroxy compound of number average molecular weight about 50-500, said epoxy-modified polybutadiene being reacted with said di- or polyhydroxy compound in molar ratio of about 1:0.5 to about 1:2.0, respectively; and B. amino resin crosslinking agent reactive with the hydroxy functionality of said crosslinkable resin, in an amount of about 5%-60% by weight of the crosslinkable resin.
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