Grease composition and direct-acting devices with the grease composition
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United States of America Patent
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Mar 18, 2014
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app pub date -
Apr 7, 2009
filing date -
Apr 11, 2008
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Abstract
A grease composition includes: a poly-α-olefin having a kinematic viscosity at 40 degrees C. of 60 to 320 mm2/s, the poly-α-olefin being contained in an amount of 50 mass % or more relative to a whole composition; a thickener that is a lithium salt of a hydroxyl-free fatty acid having 10 to 22 carbon atoms; and an ashless dithiocarbamate and/or zinc dithiocarbamate that are contained in an amount of 0.1 to 1.5 mass % in terms of sulfur relative to a whole composition. In the grease composition, a phosphorous content is 0.05 mass % or less relative to the whole composition, and a worked penetration is in a range from 265 to 310.
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