Rohm and Haas Company

The Polymer Corporation

William E Wertz

Andrew T Daly

Jeno Muthiah

Michael C Siminski

Tina L Grubb

Catherine A Kleckner

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.

Corrosion-and chip-resistant coatings for high tensile steel

Corrosion- and chip-resistant coatings for high tensile steel components, such as automotive coil springs, are formed from a coating powder composition of &ldquo;toughened&rdquo; 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.

Corrosion- and chip-resistant coatings for high tensile steel

Minor amounts of a reactive epoxy resin and a polyvinyl acetal are included within thermoplastic coating powders to improve adhesion to substrates.

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Reading, PA, United States of America

William E Wertz