The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 06, 2000
Filed:
Apr. 20, 1998
Yi-Hung Chiao, Midland, MI (US);
The Dow Chemical Company, Midland, MI (US);
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.