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US 2012/0071373 A1Published application
Lubricant oil composition
AssigneeJx Nippon Oil & Energy Corporation
InventorsShigeki Matsui, Akira Yaguchi, Reiko Kudo
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Abstract
A lubricant oil composition according to the present invention comprises: a lubricant base oil whose kinematic viscosity at 100° C. is 1 to 20 mm2/s; and a viscosity index improver in which a ratio M1a/M2a of a total area M1a of peaks in a chemical shift between 29-31 ppm to a total area M2a of peaks in a chemical shift between 64-69 ppm based on a total area of all the peaks is not less than 10 in a spectrum obtained by 13C-NMR.
Claims8
A lubricant oil composition comprising:
- a lubricant base oil whose kinematic viscosity at 100° C. is 1 to 20 mm2/s;
- and
- a viscosity index improver in which a ratio M1a/M2a of a total area M1a of peaks in a chemical shift between 29-31 ppm to a total area M2a of peaks in a chemical shift between 64-69 ppm based on a total area of all peaks is not less than 10 in a spectrum obtained by 13C-NMR.
A lubricant oil composition comprising:
- a lubricant base oil whose kinematic viscosity at 100° C. is 1 to 5 mm2/s;
- and
- a viscosity index improver in which a ratio M1b/M2b of a total area M1b of peaks in a chemical shift between 51-52.5 ppm to a total area M2b of peaks in a chemical shift between 64-66 ppm based on a total area of all peaks is not less than 0.50 in a spectrum obtained by 13C-NMR, wherein
- a ratio of an HTHS viscosity at 100° C. to an HTHS viscosity at 150° C. satisfies a condition represented by a following equation (A):
- HTHS(100° C.)/HTHS(150° C.)≧0.50 (A)
- wherein HTHS (100° C.) represents the HTHS viscosity at 100° C., and HTHS (150° C.) represents the HTHS viscosity at 150° C.
3 more elements
Dependencies are inferred from the claim text.