Carboxyl-functional adduct from oh- or epoxy-functional polymer and citric acid (anhydride) with anhydride
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United States of America Patent
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Jul 4, 2000
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N/A
app pub date -
Sep 2, 1998
filing date -
Oct 4, 1996
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Abstract
Coating compositions comprising (a) a carboxyl functional adduct which is the reaction product of (i) a compound, polymer or oligomer containing pendant and/or terminal hydroxyl or epoxy functional groups and (ii) citric acid or citric acid anhydride; and (b) an anhydride functional curing agent are disclosed. The coating compositions have accelerated tack-free times and enhanced adhesion to zinc-coated steel substrates without the use of a chrome-containing wash primer.
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