LUBRICATING OIL COMPOSITION
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United States of America Patent
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Issued Date -
Sep 26, 2024
app pub date -
Mar 22, 2022
filing date -
Mar 31, 2021
priority date (Note) -
Published
status (Latency Note)
Importance
Abstract
A lubricating oil composition that is hard to increase in viscosity in the low temperature range and is easy to increase in viscosity in the high temperature range. The lubricating oil composition contains a base oil and a viscosity index improver. The base oil contains a mineral oil and an oxygen-containing synthetic oil. The viscosity index improver contains a comb-shaped polymer. The lubricating oil composition has a kinematic viscosity of 100° C. of 9.3 mm2/s or less, a viscosity index of 280 or more, and a content Y (% by mass) of the oxygen-containing synthetic oil based on the total amount of the lubricating oil composition satisfying the following expression (1): α≤Y<−3.7 ln(X)+β (1), where α=0.5, β=19, and X represents a ratio of the number of carbon atoms and the number of oxygen atoms per one molecule of the oxygen-containing synthetic oil.
First Claim
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