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Title:
LUBRICANT OIL COMPOSITION FOR VEHICLE TRANSMISSION FLUID AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2020/194547
Kind Code:
A1
Abstract:
[Problem] To provide a lubricant oil composition which is for vehicle transmission fluid, and which has extremely excellent shear stability, has an excellent high-level balance of temperature-viscosity characteristics and low-temperature viscosity characteristics, and further has excellent heat-resistant oxidation stability. [Solution] This lubricant oil composition for vehicle transmission fluid contains a lubricant base oil and a liquid-phase random copolymer formed of ethylene and α-olefin and prepared by using a specific catalyst, wherein the kinematic viscosity at 100 °C is 4.0-7.5 mm2/s, and the Brookfield viscosity at -40 °C is 20,000 mPa·s or less. The lubricant base oil comprises: a mineral oil having a kinematic viscosity at 100 °C of 2-10 mm2/s, a viscosity index of 105 or more, and a pour point of -10 °C or less; and/or a synthetic oil having a kinematic viscosity at 100 °C of 1-10 mm2/s, a viscosity index of 120 or more, and a pour point of -30 °C or less.

Inventors:
ABE SHOTA (JP)
Application Number:
PCT/JP2019/013002
Publication Date:
October 01, 2020
Filing Date:
March 26, 2019
Export Citation:
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Assignee:
MITSUI CHEMICALS INC (JP)
International Classes:
C08F4/6592; C10M169/04; C08F210/16; C10M101/02; C10M107/02; C10M143/00
Domestic Patent References:
WO2015147215A12015-10-01
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Foreign References:
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JPH0853683A1996-02-27
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Other References:
See also references of EP 3950902A4
Attorney, Agent or Firm:
SSINPAT PATENT FIRM (JP)
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