Patents by Inventor Jin-Hun Ju
Jin-Hun Ju 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: 11111456Abstract: The present invention relates to a lubricant composition, and more particularly to a lubricant composition, which has superior oxidation stability and friction characteristics even under harsh conditions of high temperature and high pressure and is thus suitable for use in hydraulic oil. The lubricant composition of the present invention includes a base oil, a liquid olefin copolymer, a phosphorothioate compound, and phosphonium phosphate.Type: GrantFiled: November 12, 2019Date of Patent: September 7, 2021Assignee: DL Chemical CO., LTD.Inventors: Hyeung Jin Lee, Jin Hun Ju
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Patent number: 11027255Abstract: Disclosed is a method for polymerization that copolymerizes ethylene and alpha-olefin. The method includes the steps of: copolymerizing ethylene and alpha-olefin of reaction raw materials in presence of solvents, to produce a polymerization product in which low molecular weight compounds containing unreacted ethylene and alpha-olefin, the solvents, ethylene and alpha-olefin copolymers and ethylene and alpha-olefin oligomers; separating the unreacted ethylene and alpha-olefin contained in the polymerization product by distilling; separating the solvents and the low molecular weight compounds having lower molecular weight than the ethylene and alpha-olefin copolymer and contained in the polymerization product by distilling, to obtain pure polymerization product; and separating the low molecular weight oligomers from the solvents and the low molecular weight compounds previously separated by distilling to recover the solvents, and then reusing the recovered solvents as solvents for polymerization.Type: GrantFiled: November 5, 2019Date of Patent: June 8, 2021Assignee: DAELIM INDUSTRIAL CO., LTD.Inventors: Jae Hoon Uhm, Jin Hun Ju, Hee Sun Bae, Joo Mi Yeo, Sah Mun Hong
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Publication number: 20200277543Abstract: The present invention relates to a lubricant composition, and more particularly to a lubricant composition, which has superior oxidation stability and friction characteristics even under harsh conditions of high temperature and high pressure and is thus suitable for use in hydraulic oil. The lubricant composition of the present invention includes a base oil, a liquid olefin copolymer, a phosphorothioate compound, and phosphonium phosphate.Type: ApplicationFiled: November 12, 2019Publication date: September 3, 2020Applicant: DAELIM INDUSTRIAL CO., LTD.Inventors: Hyeung Jin Lee, Jin Hun Ju
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Patent number: 10632446Abstract: An apparatus and method for economically copolymerizing ethylene and alpha-olefin by reusing reacting raw materials and solvents, comprising: a polymerization reactor where ethylene and alpha-olefin are supplied as reaction raw materials with a solvent, and the reaction raw materials are copolymerized in a solution state to produce a polymerization product comprising a dissolved ethylene and alpha-olefin copolymer; a unit for separating unreacted ethylene, alpha-olefin, low molecular weight oligomer and a polymer, including a flash tower for distilling and separating the unreacted ethylene and alpha-olefin from the polymerization product, and a stripper unit for distilling and separating the solvent and the low molecular weight oligomer having a molecular weight lower than the molecular weight of the ethylene and alpha-olefin copolymer in the polymerization product; and a solvent recovery unit for separating the low molecular weight oligomer from the separated low molecular weight oligomer and solvent to recoType: GrantFiled: January 2, 2015Date of Patent: April 28, 2020Assignee: DAELIM INDUSTRIAL CO., LTD.Inventors: Jae Hoon Uhm, Jin Hun Ju, Hee Sun Bae, Joo Mi Yeo, Sah Mun Hong
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Publication number: 20200070121Abstract: Disclosed is a method for polymerization that copolymerizes ethylene and alpha-olefin. The method includes the steps of: copolymerizing ethylene and alpha-olefin of reaction raw materials in presence of solvents, to produce a polymerization product in which low molecular weight compounds containing unreacted ethylene and alpha-olefin, the solvents, ethylene and alpha-olefin copolymers and ethylene and alpha-olefin oligomers; separating the unreacted ethylene and alpha-olefin contained in the polymerization product by distilling; separating the solvents and the low molecular weight compounds having lower molecular weight than the ethylene and alpha-olefin copolymer and contained in the polymerization product by distilling, to obtain pure polymerization product; and separating the low molecular weight oligomers from the solvents and the low molecular weight compounds previously separated by distilling to recover the solvents, and then reusing the recovered solvents as solvents for polymerization.Type: ApplicationFiled: November 5, 2019Publication date: March 5, 2020Inventors: Jae Hoon UHM, Jin Hun JU, Hee Sun BAE, Joo Mi YEO, Sah Mun HONG
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Patent number: 9518138Abstract: A liquid random copolymer of ethylene and alpha-olefin prepared by using specific metallocene catalyst and ionic compound and a method for preparing the same are disclosed. The liquid random copolymer has high viscosity index and shear stability so that it is useful as synthetic lubricants. The liquid random copolymer of ethylene and alpha-olefin (1) comprises 60 to 40 mol % of ethylene units and 40 to 60 mol % of alpha-olefin unit having 3 to 20 carbon atoms, (2) has number average molecular weight (Mn) of 500 to 10,000 and a molecular weight distribution (Mw/Mn, Mw is the weight average molecular weight) of 3 or less measured by Gel Permeation Chromatography (GPC) (3) has Kinematic Viscosity at 100° C. of 30 to 5,000, (4) has pour point of 30 to ?45° C., and (5) has Bromine Number of 0.1 or less.Type: GrantFiled: November 15, 2013Date of Patent: December 13, 2016Assignee: DAELIM INDUSTRIAL CO., LTD.Inventors: Jae Hoon Uhm, Sang-Deok Mun, Jin-Hun Ju, Hee-Sun Bae, Sah-Mun Hong, Byung-Keel Sohn
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Publication number: 20160325263Abstract: An apparatus and method for economically copolymerizing ethylene and alpha-olefin by reusing reacting raw materials and solvents, comprising: a polymerization reactor where ethylene and alpha-olefin are supplied as reaction raw materials with a solvent, and the reaction raw materials are copolymerized in a solution state to produce a polymerization product comprising a dissolved ethylene and alpha-olefin copolymer; a unit for separating unreacted ethylene, alpha-olefin, low molecular weight oligomer and a polymer, including a flash tower for distilling and separating the unreacted ethylene and alpha-olefin from the polymerization product, and a stripper unit for distilling and separating the solvent and the low molecular weight oligomer having a molecular weight lower than the molecular weight of the ethylene and alpha-olefin copolymer in the polymerization product; and a solvent recovery unit for separating the low molecular weight oligomer from the separated low molecular weight oligomer and solvent to recoType: ApplicationFiled: January 2, 2015Publication date: November 10, 2016Inventors: Jae Hoon UHM, Jin Hun JU, Hee Sun BAE, Joo Mi YEO, Sah Mun HONG
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Publication number: 20150266985Abstract: A liquid random copolymer of ethylene and alpha-olefin prepared by using specific metallocene catalyst and ionic compound and a method for preparing the same are disclosed. The liquid random copolymer has high viscosity index and shear stability so that it is useful as synthetic lubricants. The liquid random copolymer of ethylene and alpha-olefin (1) comprises 60 to 40 mol % of ethylene units and 40 to 60 mol % of alpha-olefin unit having 3 to 20 carbon atoms, (2) has number average molecular weight (Mn) of 500 to 10,000 and a molecular weight distribution (Mw/Mn, Mw is the weight average molecular weight) of 3 or less measured by Gel Permeation Chromatography (GPC) (3) has Kinematic Viscosity at 100° C. of 30 to 5,000, (4) has pour point of 30 to ?45° C., and (5) has Bromine Number of 0.1 or less.Type: ApplicationFiled: November 15, 2013Publication date: September 24, 2015Applicant: DAELIM INDUSTRIAL CO., LTD.Inventors: Jae Hoon Uhm, Sang-Deok Mun, Jin-Hun Ju, Hee-Sun Bae, Sah-Mun Hong, Byung-Keel Sohn