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Title:
LUBRICANT OIL COMPOSITION FOR INTERNAL COMBUSTION ENGINES AND METHOD FOR PRODUCING SAME, AND METHOD FOR PREVENTING PRE-IGNITION
Document Type and Number:
WIPO Patent Application WO/2020/095989
Kind Code:
A1
Abstract:
A lubricant oil composition for internal combustion engines, which comprises a base oil (A), a metallic cleaner (B) comprising a calcium-based cleaner (B1), a zinc dialkyldithiophosphate (C) and a molybdenum-containing compound (D), wherein the content of the component (B1) is more than 100 ppm by mass and up to 600 ppm by mass in terms of calcium atom content relative to the whole mass of the lubricant oil composition, the content of a magnesium-based cleaner (B2) is less than 200 ppm by mass in terms of magnesium atom content relative to the whole mass of the lubricant oil composition, the content of a sodium-based cleaner (B3) is less than 200 ppm by mass in terms of sodium atom content relative to the whole mass of the lubricant oil composition, the ratio of the content of phosphorus atoms derived from the component (C) to the content of calcium atoms derived from the component (B1), i.e., [P/Ca], is 0.25 or more by mass, and the sulfated ash content is 0.7% by mass or less; a method for producing the lubricant oil composition for internal combustion engines; and a method for preventing pre-ignition using the lubricant oil composition for internal combustion engines. Thus, it is possible to provide: a lubricant oil composition for internal combustion engines, which has a satisfactory friction-reducing effect, can prevent the occurrence of LSPI in a spark-ignited internal combustion engine, and has reduced adverse effects on an exhaust gas purification device; a method for producing the lubricant oil composition for internal combustion engines; and a method for preventing pre-ignition using the lubricant oil composition for internal combustion engines.

Inventors:
SHIMIZU YASUNORI (JP)
ISHIKAWA MOTOHARU (JP)
Application Number:
PCT/JP2019/043659
Publication Date:
May 14, 2020
Filing Date:
November 07, 2019
Export Citation:
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Assignee:
IDEMITSU KOSAN CO (JP)
International Classes:
C10M169/04; C10M135/18; C10M137/10; C10N10/02; C10N10/04; C10N10/12; C10N30/00; C10N30/06; C10N40/25
Domestic Patent References:
WO2017011691A12017-01-19
WO2017011691A12017-01-19
Foreign References:
JP2016534216A2016-11-04
JP2017514984A2017-06-08
JP2018168344A2018-11-01
JP2018021107A2018-02-08
JP2017514984A2017-06-08
JP2016534216A2016-11-04
Other References:
See also references of EP 3878932A4
Attorney, Agent or Firm:
OHTANI PATENT OFFICE (JP)
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