Ambient cure latex paint
AssigneeThe Glidden Company
InventorKenneth G. Hahn, Jr.
Life of this patent
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Abstract
The paint coating composition comprises a cationic free, functional emulsion polymer mixture adapted to be coreacted at room temperature with glycoluril to provide a cured thermoset paint film. The process comprises copolymerizing ethylenically unsaturated monomers, including functional monomers, but excluding amine monomers, in an aqueous polymerization medium, followed by ion exchange of the resulting reactive emulsion polymer. Preferably, the glycoluril is processed through an ion exchange step separately or in conjunction with the reactive emulsion polymer. The resulting polymers are useful as binders in ambient cure surface coating application.
Claims14
In a process for producing an ambient dry paint coating composition, including the step of producing an emulsion polymer binder by copolymerizing ethylenically unsaturated monomers in an aqueous polymerization medium, and in the presence of surfactants and initiators, the improvement comprising:
- copolymerizing ethylenically unsaturated monomers, including carboxyl or hydroxyl functional monomers, but excluding amine monomers, to produce a functionally reactive emulsion polymer adapted to be coreactive with a glycoluril derivative;
- treating the functional emulsion polymer by contact with an ion exchange resin to remove cations from the functional emulsion polymer and produce a pH of less than 2.5, where said functionally reactive emulsion polymer is coreactive and adapted to crosslink with glycoluril derivative at ambient temperatures upon application to a substrate to produce a thermoset paint coating film.
An ambient cure paint coating composition wherein the resin components comprise a binder substantially free of cations comprising by weight between 20% and 95% functionally reactive emulsion polymer and between 5% and 80% glycoluril derivative, with pigment comprising between about 0% and 75% by weight based on the binder plus pigment, said reactive emulsion polymer containing reactive hydroxy, carboxyl, or acrylamide groups adapted to be coreactive with said glycoluril derivative, where said reactive emulsion polymer is free of amine groups, said composition produced by treating said reactive emulsion polymer and said glycoluril derivative by contact with ion exchange resin to substantially remove the cations from the emulsion polymer and the glycoluril derivative to produce a pH of less than 2.5, where the paint coating composition is adapted to thermoset at ambient temperatures upon application as a film to a substrate.
Dependencies are inferred from the claim text.