Patent ID: 7595372

Claim:
A waterborne composition which comprises: i) a water soluble epoxy silane oligomer composition containing from 7.46 to 23.5 weight percent residual monomer, wherein the epoxy silane oligomer is produced by the reaction of glycidoxy silane having 3 alkoxy groups with water, wherein the molar ratio of water to silane monomer is from 0.1 to 1.5, in the presence of a catalyst, wherein said water is continuously fed during the reaction and the by-product alcohol is continuously removed during the reaction; ii) at least one particulate metal selected from the group consisting of aluminum, manganese, cadmium, nickel, tin, magnesium, zinc, alloys thereof and ferroalloys thereof; and, iii) one or more optional ingredients selected from the group consisting of a surfactant, pH adjusting agent, co-solvent, monomeric silane, binder, crosslinker and pigment paste dispersion.