Corrosion-and chip-resistant coatings for high tensile steel
AssigneeRohm and Haas Company
InventorsTina L. Grubb, Catherine A. Kleckner, William E. Wertz, Michael C. Siminski, Andrew T. Daly, Jeno Muthiah
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Abstract
Corrosion- and chip-resistant coatings for high tensile steel components, such as automotive coil springs, are formed from a coating powder composition of “toughened” epoxy resin. In a single coat embodiment, the entire coating is loaded with at least 75 phr zinc powder. In a dual coat embodiment, an inner coat is loaded with at least 75 phr zinc and an outer, zinc-free coating is reinforced by the addition of fibers and/or by a foaming agent which renders it porous.
Claims12
A coating powder comprising a toughened thermosetting epoxy resin, from 20 to 80 phr of fibers, and a sufficient amount of a p-toluene sulfonyl hydrazide blowing or foaming agent such that when the coating powder is applied to a substrate and fused and cured, the resulting coating has a density reduced at least about 25% relative to the theoretical density of the resulting coating in the absence of p-toluene sulfonyl hydrazide.
A coating powder comprising a toughened thermosetting epoxy ran, from 20 to 80 phr of fibers, and a sufficient amount of an alkali metal borohydride blowing or foaming agent such that when the coating powder is applied to a substrate and fused and cured in the presence of a proton donor, the resulting coating has a density reduced at least about 25% relative to theoretical density of the resulting coating in the absence of an alkali metal borohydride.
Dependencies are inferred from the claim text.