Coating compositions

Claim 1

In a weldable coating composition comprising an electrically conductive pigment, an epoxy resin binder and solvent, the improvement which comprises employing as the epoxy resin binder, the reaction product of (1) an epoxy resin having an average of more than one but less than three vicinal epoxy groups per molecule which is a polyclycidyl ether of a polyhydroxyl-containing compound or mixture of such epoxy resins wherein said epoxy resins have an epoxide equivalent weight of less than about 250 and that when said epoxy resin contains aromatic or cycloaliphatic groups substituted with halogen atoms said equivalent weight is calculated on the basis of the halogen atoms being hydrogen atoms; with (2) (a) from about 90 to about 100 equivalent percent of a compound having only two amine hydrogen atoms and (b) from about 0 to about 10 equivalent percent of a compound having only one amine hydrogen; and wherein the epoxy:amine hydrogen equivalent ratio is from about 0.90:1 to about 1.1:1.