Conducting polymer-thickened grease compositions
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United States of America Patent
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Jun 30, 1998
Grant Date -
N/A
app pub date -
Mar 10, 1997
filing date -
Mar 12, 1996
priority date (Note) -
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Abstract
An electrically conducting polymer thickened grease composition containing 1) a lubricating base oil, 2) a polymer thickener, 3) an electrically conducting component, 4) optional further additives, is provided. The polymeric thickener is a mixture of (1) a (co- or homo-)polymer of propylene with a weight average molecular weight >200,000 and (2) a (co-or homo-)polymer of propylene with a weight average molecular weight <100,000. The electrically conducting component is preferably a metal containing additives, an anti-static agents or an electrically conducting solid. The grease composition can conduct electricity through the parts of a roller bearing, not only under static conditions, but also during use. This makes the greases especially suited for use in roller bearings with rotating electrical contacts. The grease can further reduce or prevent the build-up of static electricity and spark formation in roller bearings.
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