Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1998-04-20
2000-06-06
Dawson, Robert
Coating processes
With post-treatment of coating or coating material
Heating or drying
428418, 523404, B05B 302
Patent
active
060715650
ABSTRACT:
A water-borne epoxy resin coating composition comprised of: (a) particles of an epoxy resin having a neutral or positive surface charge dispersed in (b) water, an amount of (c) surfactant sufficient to disperse the epoxy resin in the water, the surfactant being a nonionic surfactant, amphoteric surfactant or mixture thereof and (d) a latent curing agent, may be applied to a metal substrate absent a primer coating and, subsequently, heated to form a cured coating on the substrate. The latent curing agent is (i) at least partially dissolved in the water, (ii) essentially insoluble with the epoxy resin and (iii) present in a sufficient amount to cure the epoxy resin. An example of a suitable latent curing agent is dicyandiamide. The cured coating displays excellent adherence, wear resistance and resistance to solvents such as acetone, a 1N HCl solution and a 1N KOH solution.
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Aylward D.
Dawson Robert
Nilsen Kevin J.
The Dow Chemical Company
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