Water reducible epoxy resin curing agent
AssigneeReichhold Chemicals, Inc.
InventorBryan A. Naderhoff
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Abstract
A curing agent for a water borne epoxy resin composition wherein the curing agent is the reaction product of a chemical excess of a polyfunctional epoxide compound and a quaternary ammonium salt in which substantially all of the excess epoxide groups in the reaction product are subsequently consumed in a reaction with a polyamine. A process for preparing the curing agent and a hardenable film forming coating composition containing as essential components, the curing agent, at least one water dispersible epoxy resin and water is also disclosed.
Claims23
A particulate water reducible curing agent for a water dispersible epoxy resin composition having an average particle size of about 0.05 to about 5 microns, and consisting essentially of the adduct reaction product of a polyamine with the unreacted epoxy groups of an intermediate;
- wherein said intermediate comprises the reaction product of a chemical excess of a polyfunctional epoxide compound with a quaternary ammonium salt in the ratio of about 0.05:1 to about 0.8:1 equivalents, respectively, so that the intermediate reaction product contains unreacted epoxy groups, and wherein said quaternary ammonium salt is the reaction product of a tertiary amine and a monocarboxylic acid having 1 to 3 carbon atoms.
A process for preparing a particulate water reducible curing agent for a water dispersible epoxy resin composition which consists essentially of:
- (a) first reacting a chemical excess of a polyfunctional epoxide compound with a quaternary ammonium salt in the ratio of about 0.05:1 to about 0.8:
- equivalents, respectively, to prepare a reaction product containing unreacted epoxy groups;
- and
- (b) condensing the unreacted epoxy groups of the reaction product with a polyamine, to form an adduct;
- wherein said quaternary ammonium salt is the reaction product of a tertiary amine and a monocarboxylic acid having 1 to 3 carbon atoms;
- and wherein said curing agent has an average particle size of about 0.05 to about 5 microns.
Dependencies are inferred from the claim text.