BIODEGRADABLE LUBRICATING OIL COMPOSITION
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United States of America Patent
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Feb 25, 2016
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Feb 27, 2015
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Abstract
The present invention provides a biodegradable lubricating oil composition containing 50% by mass or more of a synthetic ester base oil (A), 0.1 to 3% by mass of an amine-based antioxidant (B1), 0.1 to 3% by mass of a phenol-based antioxidant (B2), and 0.01 to 2% by mass of a sulfur-phosphorus-based extreme-pressure agent (C), wherein the transmittance at 3,005±1 cm−1 of a 0.1 mm-thick liquid film of the composition, as measured through IR absorptiometry, is 50% or more.
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