Ambient temperature curing aqueous coating composition based on polyurea resins
AssigneePPG Industries, Inc.
InventorsSuryya K. Das, Soner Kilic, Robert E. Jennings, Stephen J. Thomas, Joseph M. Carney
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Abstract
A two-component coating composition is disclosed wherein the binder components comprise: (a) an amino component comprising an aqueous solution and/or dispersion of at least one polyacrylate containing amino groups in a quantity sufficient to make said polyacrylate soluble and/or dispersible in water upon neutralization with acid; and (b) a polyisocyanate component containing free isocyanate groups. Also disclosed is the method of emulsifying component (b) into component (a).
Claims19
A two-component coating composition wherein the binder components comprise:
- (a) an aqueous dispersion of at least one polyacrylate, said polyacrylate containing amino groups at least partially neutralized with fugitive acid in a quantity sufficient to make said polyacrylate dispersible in water, said amino groups being present in sufficient quantity to serve as the primary reaction sites for crosslinking;
- and
- (b) a polyisocyanate crosslinking component containing free isocyanate groups;
- wherein components (a) and (b) are present in quantities corresponding to an NCO:NH equivalent ratio of0.5:1 to 5:1, based on free NCO groups, and component (b) is present in emulsified form in component (a).
A process for the production of a two-component coating composition which comprises emulsifying
- a polyisocyanate component containing free isocyanate
- in an aqueous dispersion of at least one polyacrylate, said polyacrylate containing amino groups at least partially neutralized with fugitive acid in a quantity sufficient to make said polyacrylate dispersible in water, said amino groups being present in sufficient quantity to serve as the primary reaction sites for crosslinking,
- wherein the polyisocyanate component and the amino component are present in quantities corresponding to an NCO:NH equivalent ratio of 0.5:1 to 5:1.
Dependencies are inferred from the claim text.