Patents by Inventor Tsuyoshi Yuki
Tsuyoshi Yuki 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: 11795413Abstract: The invention relates to a poly alkyl(meth)acrylate polymer comprising polybutadiene-based monomer units and a process for preparing the same. The invention also relates to the use of said polymer as a viscosity index improver in lubricant formulation and to lubricant compositions comprising said polymer.Type: GrantFiled: February 25, 2022Date of Patent: October 24, 2023Assignee: Evonik Operations GmbHInventors: Tsuyoshi Yuki, Tomohiro Matsuda, Yasuo Arai
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Patent number: 11639481Abstract: An additive composition contains a viscosity index improver and a pour point depressant. A process can be used for preparing the additive composition. The additive composition can be used as a lubricant additive in a lubricating oil formulation, and lubricating oil formulations can contain the additive composition.Type: GrantFiled: July 13, 2022Date of Patent: May 2, 2023Assignee: Evonik Operations GmbHInventors: Tsuyoshi Yuki, Yasuo Arai, Tomohiro Matsuda, Nobuhiro Kishida
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Publication number: 20230025387Abstract: An additive composition contains a viscosity index improver and a pour point depressant. A process can be used for preparing the additive composition. The additive composition can be used as a lubricant additive in a lubricating oil formulation, and lubricating oil formulations can contain the additive composition.Type: ApplicationFiled: July 13, 2022Publication date: January 26, 2023Applicant: Evonik Operations GmbHInventors: Tsuyoshi YUKI, Yasuo Arai, Tomohiro Matsuda, Nobuhiro Kishida
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Publication number: 20220306962Abstract: The invention relates to a poly alkyl(meth)acrylate polymer comprising polybutadiene-based monomer units and a process for preparing the same. The invention also relates to the use of said polymer as a viscosity index improver in lubricant formulation and to lubricant compositions comprising said polymer.Type: ApplicationFiled: February 25, 2022Publication date: September 29, 2022Applicant: Evonik Operations GmbHInventors: Tsuyoshi Yuki, Tomohiro Matsuda, Yasuo Arai
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Patent number: 10941368Abstract: Selected comb polymers contain specified amounts of macromonomer and nitrogen-containing (meth)acrylates. Lubricant compositions can contain such comb polymers. The selected comb polymers can be used as solubilizers in lubricant compositions, especially in engine oil (EO) compositions.Type: GrantFiled: December 15, 2017Date of Patent: March 9, 2021Assignee: Evonik Operations GmbHInventors: Tsuyoshi Yuki, Yasuo Arai, Tomohiro Matsuda, Nobuhiro Kishida
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Publication number: 20200291218Abstract: Polyalkyl(meth)acrylate based polymers which include straight chained C18-24 alkyl(meth)acrylates and have an average carbon number of 7.0 to 7.5 and a weight-average molecular weight of 300,000 g/mol or greater are a useful component for a lubricant composition. Furthermore, lubricant compositions containing such polymers show improved high temperature-high shear performance, especially in engine oil (EO) compositions.Type: ApplicationFiled: March 10, 2020Publication date: September 17, 2020Applicant: Evonik Operations GmbHInventors: Tsuyoshi YUKI, Tomohiro Matsuda, Boris Eisenberg
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Publication number: 20190367836Abstract: Selected comb polymers contain specified amounts of macromonomer and nitrogen-containing (meth)acrylates. Lubricant compositions can contain such comb polymers. The selected comb polymers can be used as solubilizers in lubricant compositions, especially in engine oil (EO) compositions.Type: ApplicationFiled: December 15, 2017Publication date: December 5, 2019Applicant: Evonik Oil Additives GmbHInventors: Tsuyoshi YUKI, Yasuo Arai, Tomohiro Matsuda, Nobuhiro Kishida
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Patent number: 7579305Abstract: The present invention provides a friction modifier for a lubricating oil which comprises an oil-soluble copolymer (A) containing at least one unit of a monomer (a) represented by the general formula (1) and at least one unit of a monomer (b) represented by the general formula (2), and having a weight average molecular weight of 3,000 or more; CH2?C(R1)-Q-(Z-A1)m-X??(1) CH2?C(R3)—CO—(O—A2)n—OR4??(2) a friction modifier composition comprising the above copolymer (A), and at least one species selected from the group consisting of a diluent and other additives; a lubricating oil composition comprising base oil, and the above friction modifier or friction modifier composition. These are excellent in the friction regulation effect, capable of reducing transmission shock, are high in the friction coefficient required for power transmission, and in addition, are excellent in wear resistance.Type: GrantFiled: March 27, 2003Date of Patent: August 25, 2009Assignee: Sanyo Chemical Industries, Ltd.Inventors: Tsuyoshi Yuki, Minoru Nishida
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Patent number: 7557241Abstract: A method for producing an ?,?-unsaturated carboxylic acid ester is provided in which an alcohol (A) is caused to react with an ?,?-unsaturated carboxylic acid or a lower alkyl ester (B) of the ?,?-unsaturated carboxylic acid in the presence of a sulfonic acid group-carrying inorganic porous material (?), and an ?,?-unsaturated carboxylic acid ester obtained by the above-described method is provided that contains not more than 50 ppm of sulfur atoms based on a weight of the ?,?-unsaturated carboxylic acid ester, not more than 2 mol % of by-product etherification products and not more than 1 mol % of by-product addition products based on the mole number of the ?,?-unsaturated carboxylic acid ester.Type: GrantFiled: February 22, 2007Date of Patent: July 7, 2009Assignee: Sanyo Chemical Industries, Ltd.Inventors: Hideo Nakanishi, Satoshi Utsui, Tsuyoshi Yuki
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Publication number: 20070173421Abstract: A method for producing an ?,?-unsaturated carboxylic acid ester is provided in which an alcohol (A) is caused to react with an ?,?-unsaturated carboxylic acid or a lower alkyl ester (B) of the ?,?-unsaturated carboxylic acid in the presence of a sulfonic acid group-carrying inorganic porous material (?), and an ?,?-unsaturated carboxylic acid ester obtained by the above-described method is provided that contains not more than 50 ppm of sulfur atoms based on a weight of the ?,?-unsaturated carboxylic acid ester, not more than 2 mol % of by-product etherification products and not more than 1 mol % of by-product addition products based on the mole number of the ?,?-unsaturated carboxylic acid ester.Type: ApplicationFiled: February 22, 2007Publication date: July 26, 2007Applicant: Sanyo Chemical Industries, Ltd.Inventors: Hideo Nakanishi, Satoshi Utsui, Tsuyoshi Yuki
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Publication number: 20060105924Abstract: The present invention provides a friction modifier for a lubricating oil which comprises an oil-soluble copolymer (A) containing at least one unit of a monomer (a) represented by the general formula (1) and at least one unit of a monomer (b) represented by the general formula (2), and having a weight average molecular weight of 3,000 or more; CH2?C(R1)-Q-(Z-A1)m-X??(1) CH2?C(R3)—CO—(O-A2)n-OR4??(2) a friction modifier composition comprising the above copolymer (A), and at least one species selected from the group consisting of a diluent and other additives; a lubricating oil composition comprising base oil, and the above friction modifier or friction modifier composition. These are excellent in the friction regulation effect, capable of reducing transmission shock, are high in the friction coefficient required for power transmission, and in addition, are excellent in wear resistance.Type: ApplicationFiled: March 27, 2003Publication date: May 18, 2006Inventors: Tsuyoshi Yuki, Minoru Nishida
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Patent number: 6746993Abstract: Viscosity index improvers, are disclosed, comprising the following polymer (A1) or (A0). Polymer (A1) has a solubility parameter of 8.6-9.4, a crystallizing initiation temperature of −15° C. or less and a steric hindrance factor (F) of 0-13, and comprises units of at least one of (a) C1-40alkyl group-containing (meth)acrylates, (b) alkyl alkenyl ethers, (c) alkenyl carboxylates and (d) nitrogen-containing unsaturated monomers. Polymer (A0) comprises units of a branched C20-40alkyl group-containing (meth)acrylate (a0) capable of providing a homopolymer having a Tc of 5° C. or less and units of another alkyl (meth)acrylate. Monomers, 2-decyl-tetradecyl methacrylate and 2-decyl-tetradecyl acrylate, are also described, suitable for producing polymers for viscosity index improvers.Type: GrantFiled: August 7, 2002Date of Patent: June 8, 2004Assignee: Sanyo Chemical Industries, Ltd.Inventors: Tsuyoshi Yuki, Yoshihisa Ota
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Publication number: 20040077509Abstract: Viscosity index improvers, are disclosed, comprising oil-soluble copolymer (A) comprising units of 5-90% by weight of a monomer (a) represented by the general formula:Type: ApplicationFiled: August 1, 2003Publication date: April 22, 2004Inventors: Tsuyoshi Yuki, Minoru Nishida
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Publication number: 20030104955Abstract: Viscosity index improvers, are disclosed, comprising the following polymer (A1) or (A0).Type: ApplicationFiled: August 7, 2002Publication date: June 5, 2003Applicant: SANYO CHEMICAL INDUSTRIES, LTD.Inventors: Tsuyoshi Yuki, Yoshihisa Ota
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Publication number: 20030036488Abstract: A viscosity index improver, which comprises a polymer (A) having a solubility parameter of 8.6-9.4, a crystallizing initiation temperature of equal to or less than −15° C.Type: ApplicationFiled: April 3, 2002Publication date: February 20, 2003Applicant: Sanyo Chemical Industries, Ltd.Inventors: Tsuyoshi Yuki, Yoshihisa Ota
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Patent number: 6284362Abstract: An absorbent composition is produced by drying a mixture obtained by mixing a micro-filler (B) with a hydrogel having a water absorptive resin (A) and water. The hydrogel is produced by performing polymerization to produce the resin (A) and not drying the resin (A) after the polymerization. The absorbent composition has a specific surface area at least 10% lager than that of a reference composition produced by drying the hydrogel without the micro-filler (B).Type: GrantFiled: January 18, 2000Date of Patent: September 4, 2001Assignee: Sanyo Chemical Industries, Ltd.Inventors: Hitoshi Takai, Tsuyoshi Yuki, Shingo Mukaida, Daisuke Tagawa, Kenji Tanaka, Keiji Tanaka, Satoshi Tamabuchi, Yoshiyuki Iwasaki
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Patent number: 6156678Abstract: A water absorbing agent comprising water absorbent resin particles having a particle size of 1000 .mu.m or less, with a two-peak mode particle size distribution, which has an inflection point in the range of 750 to 250 .mu.m particle size prepared by plotting the mass cumulative content percentage from the larger side of the particle size of the particle size distribution on a logarithmic normal probability paper; and an absorbent material utilizing the water absorbing agent. Since the water absorbing agent of the present invention applied in an absorbent material can realize excellent absorption rate of a liquid and planar diffusion, an absorbent material with an excellent surface dryness can be obtained even for a long time use or when the ratio of the water absorbent resin is high due to a thin shape of the product, without the risk of leakage. Accordingly, the water absorbing agent of the present invention can be preferably used in an absorbent material such as a disposable diaper.Type: GrantFiled: October 23, 1997Date of Patent: December 5, 2000Assignee: Sanyo Chemical Industries, Ltd.Inventors: Shingo Mukaida, Tsuyoshi Yuki, Kenji Tanaka
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Patent number: 5886120Abstract: A method for producing a water absorbent resin by polymerizing a water-soluble monomer having a polymerizable unsaturated group (A) and a crosslinking agent (B) as the essential components by radical polymerization in the presence of water or, polymerizing a water-soluble monomer having an unsaturated group (A) and a crosslinking agent (B) by radical-graft copolymerization with a water-soluble polymer (C) as the backbone polymer in the presence of water, wherein a water-based solid material capable of being endothermally fused or dissolved into water (D) is added when initiating the polymerization, with at least a part of the water-based solid material (D) in a solid state. By the method of the present invention, a water absorbent resin having a high molecular weight and a high absorption capacity with little water-soluble component can be obtained with ease.Type: GrantFiled: December 22, 1997Date of Patent: March 23, 1999Assignee: Sanyo Chemical Industries, Ltd.Inventors: Keiji Tanaka, Masashi Date, Kenjiro Tsubota, Tsuyoshi Yuki, Satoshi Tamabuchi
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Patent number: 5801238Abstract: A method for producing a water absorbent resin comprising the step of radically polymerizing a water-soluble radically polymerizable monomer having an acid group or a group of the salt thereof and optionally a polysaccharide in the presence of water using a crosslinking agent (C), wherein 0.0001 to 1 weight % of a thiol compound (D) having a radically polymerizable double bond, based on the above mentioned water-soluble radically polymerizable monomer (A), is used as the copolymerizing component to provide a water absorbent resin having a high absorbency and a good gel stability after absorbing body fluid, and a water absorbent comprising the water absorbent resin produced thereby.Type: GrantFiled: September 10, 1996Date of Patent: September 1, 1998Assignee: Sanyo Chemical Industries, Ltd.Inventors: Keiji Tanaka, Masashi Date, Kenjiro Tsubota, Tsuyoshi Yuki, Satoshi Tamabuchi
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Patent number: 5789507Abstract: A method for preparing water-absorbent resins (D) by radically polymerizing a water soluble monomer (A), or a water-soluble monomer (A) and a polysaccharide (B) in the presence of a crosslinking agent (C) and water, wherein the polymerization is conducted under the existence of a thiol compound (E). Water-absorbent resins obtained in the method of the present invention provide high absorption while providing safety with very little amount of a water-soluble component.Type: GrantFiled: September 13, 1996Date of Patent: August 4, 1998Assignee: Sanyo Chemical Industries, Ltd.Inventors: Keiji Tanaka, Masashi Date, Satoshi Tamabuchi, Tsuyoshi Yuki, Kenjiro Tsubota