Title:
MINERAL-OIL BASE OIL, LUBRICATING OIL COMPOSITION, INTERNAL COMBUSTION ENGINE, AND LUBRICATING METHOD FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2018/117121
Kind Code:
A1
Abstract:
Provided is a mineral-oil base oil satisfying the following requirements (I) to (V).
∙ Requirement (I): The base oil has a kinematic viscosity at 100°C of 2 mm2/s or higher but lower than 7 mm2/s.
∙ Requirement (II): The base oil has a viscosity index of 100 or more.
∙ Requirement (III): When the base oil is examined for complex viscosity with a rotating rheometer under the conditions of an angular velocity of 6.3 rad/s and strains of 0.1-100%, then the complex viscosity has a temperature gradient Δ|η*| between -10°C and -25°C of 60 Pa∙s/°C or less.
∙ Requirement (IV): When examined for the content of monocycloparaffins (R1) and the content of bi- to hexacycloparaffins (R2) in accordance with ASTM D 2786, then the base oil has a ratio by volume between the contents, R1/R2, of 0.70 or less.
∙ Requirement (V): The base oil has a %CA less than 1.0.
The mineral-oil base oil makes it possible to prepare an engine oil which is satisfactory in terms of low-temperature viscosity characteristics including low-temperature mileage-saving performance and low-temperature engine starting performance and which is excellent in terms of high-temperature piston-cleaning performance.
Inventors:
KASAI MORITSUGU (JP)
KURODA NORIHIRO (JP)
KURODA NORIHIRO (JP)
Application Number:
PCT/JP2017/045599
Publication Date:
June 28, 2018
Filing Date:
December 19, 2017
Export Citation:
Assignee:
IDEMITSU KOSAN CO (JP)
International Classes:
C10M101/02; C10N20/00; C10N20/02; C10N20/04; C10N30/02; C10N30/04; C10N40/25
Domestic Patent References:
| WO2013147302A1 | 2013-10-03 | |||
| WO2013147305A1 | 2013-10-03 |
Foreign References:
| JP2008013681A | 2008-01-24 | |||
| JP2008013684A | 2008-01-24 | |||
| JP2007270059A | 2007-10-18 | |||
| JP2010090251A | 2010-04-22 | |||
| JP2006519910A | 2006-08-31 | |||
| JP6047224B1 | 2016-12-21 |
Attorney, Agent or Firm:
HIRASAWA, Kenichi et al. (JP)
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