Chromium-free water reducible rust inhibitive paint for metals

Details Chromium-free water reducible rust inhibitive paint for metals Chromium-free water reducible rust inhibitive paint for metals

2005-11-01

2005-11-01

Green, Anthony J. (Department: 1755)

Compositions: coating or plastic

Coating or plastic compositions

Corrosion inhibiting coating composition

C106S014120, C106S014440, C428S447000, C428S450000, C428S457000, C524S439000, C524S441000

Reexamination Certificate

active

06960247

ABSTRACT:
Provided is a chromium-free rust inhibitive paint for metals which is obtained by mixing a flaky zinc powder into a water reducible binder solution containing a water reducible resin emulsion and a water soluble silane coupling agent. A thin film of a silane compound having a hydrophobic group is added to particle surfaces of the flaky zinc powder, whereby the flaky metallic zinc powder exhibits water repellent property. When a surface treatment agent which contains an alkoxysilane oligomer as an essential component is applied to the paint film of a rust inhibitive paint for metals, this extends the time until red rusting occurs on painted metal products to not less than twice and prevents white rusting and black rusting for a long time. Rust inhibitive performance is further improved by blending a nano-sized powder of titanium dioxide, polyvinyl butyral, a silane coupling agent, etc., with the surface treatment agent.

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