Patents by Inventor Motoharu Ishikawa
Motoharu Ishikawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11905486Abstract: An object is to provide a viscosity index improver composition that is capable of properly regulating the HTHS viscosity in the effective temperature range of a lubricating oil composition to a lower range, and a lubricating oil composition containing the viscosity index improver composition, and the viscosity index improver composition contains a comb-shaped polymer (A) containing a structural unit derived from a macromonomer (?) and a structural unit derived from a particular monomer (A1), the macromonomer (?) having a (meth)acryloyl group at one end, and having a structural unit derived from a monomer (?1) selected from butadiene and hydrogenated butadiene.Type: GrantFiled: September 24, 2020Date of Patent: February 20, 2024Assignee: IDEMITSU KOSAN CO., LTD.Inventors: Yoriyuki Takashima, Taeko Nakano, Koki Hirano, Motoharu Ishikawa
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Publication number: 20220372394Abstract: An object is to provide a viscosity index improver composition that is capable of properly regulating the HTHS viscosity in the effective temperature range of a lubricating oil composition to a lower range, and a lubricating oil composition containing the viscosity index improver composition, and the viscosity index improver composition contains a comb-shaped polymer (A) containing a structural unit derived from a macromonomer (?) and a structural unit derived from a particular monomer (A1), the macromonomer (?) having a (meth)acryloyl group at one end, and having a structural unit derived from a monomer (?1) selected from butadiene and hydrogenated butadiene.Type: ApplicationFiled: September 24, 2020Publication date: November 24, 2022Applicant: IDEMITSU KOSAN CO.,LTD.Inventors: Yoriyuki TAKASHIMA, Taeko NAKANO, Koki HIRANO, Motoharu ISHIKAWA
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Publication number: 20210371767Abstract: A lubricating oil composition for internal combustion engines containing a base oil (A), a metal-based detergent (B) containing a calcium-based detergent (B1), a zinc dialkyldithiophosphate (C), and a molybdenum-containing compound (D), wherein a calcium atom-equivalent content of the calcium-based detergent (B1) is more than 100 ppm by mass and 600 ppm by mass or less, based on a total amount of the composition, a magnesium atom-equivalent content of a magnesium-based detergent (B2) is less than 200 ppm by mass, based on the total amount of the composition, a sodium atom-equivalent content of a sodium-based detergent (B3) is less than 200 ppm by mass, based on the total amount of the composition, a content ratio of phosphorus derived from the zinc dialkyldithiophosphate (C) to calcium derived from the calcium-based detergent (B1) [P/Ca] is 0.25 or more by mass, and a sulfated ash content is 0.7% by mass or less; and a method for producing the composition.Type: ApplicationFiled: November 7, 2019Publication date: December 2, 2021Applicant: IDEMITSU KOSAN CO.,LTD.Inventors: Yasunori SHIMIZU, Motoharu ISHIKAWA
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Patent number: 11041132Abstract: Provided is a lubricating oil composition containing a base oil (A) containing a mineral oil (A1) having a complex viscosity ?* at ?35° C. of 150 Pa·s or less as measured with a rotary rheometer under conditions at an angular velocity of 6.3 rad/s and a strain amount of 0.1%; a viscosity index improver (B) containing a comb-shaped polymer (B1); and a molybdenum-based friction modifier (C), wherein the content of the molybdenum-based friction modifier (C) in terms of a molybdenum atom is more than 500 ppm by mass and less than 900 ppm by mass on the basis of the whole amount of the lubricating oil composition, and a NOACK value is 10% by mass or less.Type: GrantFiled: March 23, 2017Date of Patent: June 22, 2021Assignee: IDEMITSU KOSAN CO., LTD.Inventors: Hiroshi Oki, Motoharu Ishikawa
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Publication number: 20200325411Abstract: Provided is a lubricating oil composition containing a base oil (A) containing a mineral oil (A1) having a complex viscosity ?* at ?35° C. of 150 Pa·s or less as measured with a rotary rheometer under conditions at an angular velocity of 6.3 rad/s and a strain amount of 0.1%; a viscosity index improver (B) containing a comb-shaped polymer (B1); and a molybdenum-based friction modifier (C), wherein the content of the molybdenum-based friction modifier (C) in terms of a molybdenum atom is more than 500 ppm by mass and less than 900 ppm by mass on the basis of the whole amount of the lubricating oil composition, and a NOACK value is 10% by mass or less.Type: ApplicationFiled: March 23, 2017Publication date: October 15, 2020Applicant: IDEMITSU KOSAN CO., LTD.Inventors: Hiroshi OKI, Motoharu ISHIKAWA
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Patent number: 10301570Abstract: Provided are a lubricating oil composition for internal combustion engine, containing a lubricating base oil containing a mineral oil and/or a synthetic oil, (A) an overbased calcium salicylate, (B) an overbased magnesium detergent, (C) a binuclear and/or trinuclear organic molybdenum compound, (D) a phenol-based antioxidant, and (E) an amine-based antioxidant, wherein the component (C), the component (D), and the component (E) are contained in specified contents on the basis of the whole amount of the lubricating oil composition; a method for producing the lubricating oil composition for internal combustion engine; and a lubrication method including using the lubricating oil composition for internal combustion engine.Type: GrantFiled: March 31, 2016Date of Patent: May 28, 2019Assignee: IDEMITSU KOSAN CO., LTD.Inventors: Motoharu Ishikawa, Tatsuya Kusumoto, Shinji Suzuki
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Publication number: 20190024009Abstract: Provided is a lubricating oil composition containing a base oil (A); a molybdenum dithiophosphate (B1) in an amount of 400 ppm by mass or more as expressed in terms of a molybdenum atom; an organic metal-based detergent (C1) containing a metal atom selected from an alkali metal atom and an alkaline earth metal atom in an amount of 1,400 ppm by mass or less as expressed in terms of the metal atom; and a hindered amine-based antioxidant (D1) in an amount of 900 ppm by mass or more as expressed in terms of a nitrogen atom, with a sulfated ash content being 0.70% by mass or less. The lubricating oil composition may be one in which the detergency, the wear resistance, and the friction-reducing effect are improved with a well balance while reducing the ash content.Type: ApplicationFiled: February 24, 2017Publication date: January 24, 2019Applicant: IDEMITSU KOSAN CO., LTD.Inventors: Tatsuya KUSUMOTO, Motoharu ISHIKAWA, Hiroshi OKI
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Publication number: 20170121627Abstract: Provided are a lubricating oil composition for internal combustion engine, containing a lubricating base oil containing a mineral oil and/or a synthetic oil, (A) an overbased calcium salicylate, (B) an overbased magnesium detergent, (C) a binuclear and/or trinuclear organic molybdenum compound, (D) a phenol-based antioxidant, and (E) an amine-based antioxidant, wherein the component (C), the component (D), and the component (E) are contained in specified contents on the basis of the whole amount of the lubricating oil composition; a method for producing the lubricating oil composition for internal combustion engine; and a lubrication method including using the lubricating oil composition for internal combustion engine.Type: ApplicationFiled: March 31, 2016Publication date: May 4, 2017Applicant: IDEMITSU KOSAN CO., LTD.Inventors: Motoharu ISHIKAWA, Tatsuya KUSUMOTO, Shinji SUZUKI
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Patent number: 9023190Abstract: A lubricating oil composition for an internal combustion engine contains: a base oil including a component (A) of a polyalphaolefin having a kinematic viscosity at 100 degrees C. of 5.5 mm2/s or less, a CCS viscosity at ?35 degrees C. of 3000 mPa·s or less and a NOACK of 12 mass % or less and a component (B) of a mineral oil having a viscosity index of 120 or more; and polyisobutylene having a mass average molecular weight of 500,000 or more. A content of the composition (A) is 25 mass % or more of a total amount of a lubricating oil.Type: GrantFiled: March 31, 2011Date of Patent: May 5, 2015Assignee: Idemitsu Kosan Co., Ltd.Inventors: Kazuhiro Teshima, Motoharu Ishikawa
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Patent number: 9023191Abstract: A lubricating oil composition for an internal combustion engine contains a component (A) of a polyalphaolefin having a kinematic viscosity at 100 degrees C. of 5.5 mm2/s or less, a CCS viscosity at ?35 degrees C. of 3000 mPA·s or less and a NOACK of 12 mass % or less, and a component (B) of a mineral oil having a viscosity index of 120 or more. The component (A) is contained at a content of 10 mass % or more of a total amount of the composition.Type: GrantFiled: March 31, 2011Date of Patent: May 5, 2015Assignee: Idemitsu Kosan Co., Ltd.Inventors: Kazuhiro Teshima, Motoharu Ishikawa
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Patent number: 8992762Abstract: A lubricating oil composition for an internal combustion engine contains: a base oil including a component (A) of a polyalphaolefin having a kinematic viscosity at 100 degrees C. of 5.5 mm2/s or less, a CCS viscosity at ?35 degrees C. of 3000 mPa·s or less and a NOACK of 12 mass % or less and a component (B) of a mineral oil having a viscosity index of 120 or more; and polyisobutylene having a mass average molecular weight of 500,000 or more. A content of the composition (A) is 25 mass % or more of a total amount of a lubricating oil.Type: GrantFiled: March 31, 2011Date of Patent: March 31, 2015Assignee: Idemitsu Kosan Co., Ltd.Inventors: Kazuhiro Teshima, Motoharu Ishikawa
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Patent number: 8992763Abstract: A lubricating oil composition for an internal combustion engine contains a component (A) of a polyalphaolefin having a kinematic viscosity at 100 degrees C. of 5.5 mm2/s or less, a CCS viscosity at ?35 degrees C. of 3000 mPA·s or less and a NOACK of 12 mass % or less, and a component (B) of a mineral oil having a viscosity index of 120 or more. The component (A) is contained at a content of 10 mass % or more of a total amount of the composition.Type: GrantFiled: March 31, 2011Date of Patent: March 31, 2015Assignee: Idemitsu Kosan Co., Ltd.Inventors: Kazuhiro Teshima, Motoharu Ishikawa
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Patent number: 8580719Abstract: A lubricating oil composition for internal combustion engines which comprises a base oil comprising mineral oils and/or synthetic oils and polyisobutylene having a weight-average molecular weight of 500,000 or higher. Consumption of the engine oil can be decreased by using the above composition. In particular, consumption of the engine oil can be decreased even when the above composition is used as the engine oil of the energy saving type using a base oil having a low viscosity.Type: GrantFiled: March 29, 2007Date of Patent: November 12, 2013Assignee: Idemitsu Kosan Co., Ltd.Inventors: Motoharu Ishikawa, Masahiko Kido
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Patent number: 8557751Abstract: The lubricating oil composition contains a base oil, a phosphate ester derivative represented by a formula (1) below and a zinc compound. An element ratio (Zn/P) between zinc (Zn) and phosphorus (P) in the lubricating oil composition is 0.55 or more at a mole ratio. In the formula, Y represents S (sulfur) or O (oxygen); R1 represents an organic group having 4 to 24 carbon atoms; R2 represents a divalent organic group having 1 to 6 carbon atoms; and n represents an integer of 1 to 3.Type: GrantFiled: April 25, 2008Date of Patent: October 15, 2013Assignee: Idemitsu Kosan Co., Ltd.Inventors: Hirotaka Yamasaki, Motoharu Ishikawa
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Publication number: 20130030226Abstract: A lubricating oil composition for an internal combustion engine contains: a base oil including a component (A) of a polyalphaolefin having a kinematic viscosity at 100 degrees C. of 5.5 mm2/s or less, a CCS viscosity at +35 degrees C. of 3000 mPa·s or less and a NOACK of 12 mass % or less and a component (B) of a mineral oil having a viscosity index of 120 or more; and polyisobutylene having a mass average molecular weight of 500,000 or more. A content of the composition (A) is 25 mass % or more of a total amount of a lubricating oil.Type: ApplicationFiled: March 31, 2011Publication date: January 31, 2013Applicant: IDEMITSU KOSAN CO., LTD.Inventors: Kazuhiro Teshima, Motoharu Ishikawa
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Publication number: 20130023705Abstract: A lubricating oil composition for an internal combustion engine contains a component (A) of a polyalphaolefin having a kinematic viscosity at 100 degrees C. of 5.5 mm2/s or less, a CCS viscosity at ?35 degrees C. of 3000 mPA·s or less and a NOACK of 12 mass % or less, and a component (B) of a mineral oil having a viscosity index of 120 or more. The component (A) is contained at a content of 10 mass % or more of a total amount of the composition.Type: ApplicationFiled: March 31, 2011Publication date: January 24, 2013Applicant: IDEMITSU KOSAN CO., LTD.Inventors: Kazuhiro Teshima, Motoharu Ishikawa
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Publication number: 20130023456Abstract: A lubricating oil composition for an internal combustion engine contains a component (A) of a polyalphaolefin having a kinematic viscosity at 100 degrees C. of 5.5 mm2/s or less, a CCS viscosity at ?35 degrees C. of 3000 mPA·s or less and a NOACK of 12 mass % or less, and a component (B) of a mineral oil having a viscosity index of 120 or more. The component (A) is contained at a content of 25 mass % or more of a total amount of the composition.Type: ApplicationFiled: March 31, 2011Publication date: January 24, 2013Applicant: Idemitsu Kosan Co., Ltd.Inventors: Kazuhiro Teshima, Motoharu Ishikawa
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Patent number: 8129319Abstract: A lubricating composition comprising a base oil, (A) one or more kinds of compounds selected from phenolic antioxidants and aminic antioxidants, and (B) an ester compound having a disulfide structure is provided. The lubricating composition of the present invention has excellent stability against oxidation, prevents increase of acid value and sludge formation, and has low corrosivity to non-ferrous metals.Type: GrantFiled: August 8, 2006Date of Patent: March 6, 2012Assignee: Idemitsu Kosan Co., Ltd.Inventors: Tadashi Katafuchi, Motoharu Ishikawa
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Patent number: 7960318Abstract: The present invention provides a lubricating oil composition comprising a lube base oil comprising a mineral oil and/or a synthetic oil; (A) an alkenylsuccinimide or an alkylsuccinimide and/or a boron-containing derivative thereof in an amount of 0.01 to 0.14% by mass based on the composition in terms of the nitrogen content as an ashless dispersant, wherein an alkenylsuccic acid monoimide or an alkylsuccinic acid monoimide and/or a boron-containing derivative thereof in the ashless dispersant is 0.05% by mass or less in terms of nitrogen content; and (B) a dialkyldiphenylamine compound in an amount of 0.3 to 5.0% by mass and a hindered phenol compound in an amount of 0 to 2.5% by mass based on the composition as an antioxidant, and (C) a sulfated ash of the lubricating oil composition is 1.2% by mass or less.Type: GrantFiled: December 21, 2005Date of Patent: June 14, 2011Assignee: Idemitsu Kosan Co., Ltd.Inventors: Hideki Kamano, Motoharu Ishikawa, Kazuhiro Teshima
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Publication number: 20110003723Abstract: A lubricating oil composition is used in an internal combustion engine that uses a fuel containing at least one fat and oil of natural fat and oil, hydrotreated natural fat and oil, transesterified natural fat and oil and hydrotreated transesterified natural fat and oil. A sulfur compound containing at least one —C—S—C-bond is added to base oil. A content of sulfur contained in the —C—S—C-bond is 0.3 mass % or less based on a total amount of the compound.Type: ApplicationFiled: February 10, 2009Publication date: January 6, 2011Applicant: Idemitsu Kosan Co., Ltd.Inventors: Kazuhiro Teshima, Motoharu Ishikawa