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US 5,686,511 AGranted
Esterifying epoxy resin with carboxyl polymer and quenching
AssigneeThe Valspar Corporation
InventorWilliam S. Bobo
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Abstract
A method of preparing a water-dispersible epoxy resin coating composition comprises: (a) Reacting an epoxy polymer with a carboxyl bearing polymer in the presence of an esterification catalyst; (b) Quenching with an excess of tertiary amine before the esterification reaction is completed; and (c) adding water to form an aqueous dispersion.
Claims15
A method of preparing a water-dispersible epoxy resin coating composition comprising:
- (a) reacting an epoxy polymer with a carboxyl bearing polymer in a stoichiometric ratio of oxirane to carboxyl groups of from about 0.05:1 to 0.5:1 in the presence of an esterification catalyst;
- (b) quenching the reaction with an excess of tertiary amine before the esterification reaction is completed, wherein the reaction is quenched before the acid value of the reaction mixture has decreased an amount that is about 90% of the difference between the initial acid value and the theoritical acid value at the gel point;
- and
- (c) adding water to form an aqueous dispersion.
1 more element
Dependencies are inferred from the claim text.