Patents by Inventor Ki-Nam Chung
Ki-Nam Chung 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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Publication number: 20230303429Abstract: Porous glass nanoparticles according to an embodiment have a specific surface area of 250 m2/g to 800 m2/g, and a pore volume of 0.1 cm3/g to 1 cm3/g. Since the porous glass nanoparticles have a high specific surface area and pore volume, the porous glass nanoparticles may have improved agilities to remineralize the demineralized dentin and occlude dentinal tubules. In addition, by including the porous glass nanoparticles, a dentin adhesive composition with improved adhesive strength to the dentin surface may be provided.Type: ApplicationFiled: March 31, 2022Publication date: September 28, 2023Inventors: Ki Nam CHUNG, Jae Seok SONG, Gyu Young KIM
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Patent number: 10053481Abstract: Provided are a novel transition metal compound, a transition metal catalyst composition for preparing an ethylene homopolymer or a copolymer of ethylene and ?-olefin, containing the same, a method for preparing an ethylene homopolymer or a copolymer of ethylene and ?-olefin using the same, and an ethylene homopolymer or a copolymer of ethylene and ?-olefin prepared using the same.Type: GrantFiled: May 28, 2015Date of Patent: August 21, 2018Assignee: SABIC SK NEXLENE COMPANY PTE. LTD.Inventors: Sun Young Kim, Dong Cheol Shin, Sang Ick Lee, Ki Nam Chung, Sung Seok Chae, Yonggyu Han
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Publication number: 20170204129Abstract: Provided are a novel transition metal compound, a transition metal catalyst composition for preparing an ethylene homopolymer or a copolymer of ethylene and ?-olefin, containing the same, a method for preparing an ethylene homopolymer or a copolymer of ethylene and ?-olefin using the same, and an ethylene homopolymer or a copolymer of ethylene and ?-olefin prepared using the same.Type: ApplicationFiled: May 28, 2015Publication date: July 20, 2017Inventors: Sun Young KIM, Dong Cheol SHIN, Sang Ick LEE, Ki Nam CHUNG, Sung Seok CHAE, Yonggyu HAN
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Publication number: 20170204128Abstract: The present invention relates to a method for preparing a transition metal complex for the preparation of an olefin copolymer, and more specifically, to a method for preparing a transition metal complex comprising: a transition metal of Group 4 in the periodic table; a cyclopentadienyl ligand; and at least one phenolic ligand capable of being purified by sublimation or a simple filtration, wherein a halogen, in particular chlorine, is not included in the preparation of the transition metal complex.Type: ApplicationFiled: May 26, 2015Publication date: July 20, 2017Inventors: Yonggyu HAN, Sun Young KIM, Dong Cheol SHIN, Sang Ick LEE, Ki Nam CHUNG, Sung Seok CHAE
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Patent number: 9487640Abstract: Provided are a plasticizer for a resin composition including any one or more selected from a polyvinyl chloride resin, a polyurethane resin, an epoxy resin, a polycarbonate resin or a biodegradable resin, which has excellent mechanical properties such as tensile strength, elongation and hardness, and shape processability, and particularly has excellent flexibility at low temperatures, does not cause bleeding because compatibility with the resins is good, and has excellent transparency, heat resistance, cold resistance and durability, and a resin composition including the same.Type: GrantFiled: May 17, 2012Date of Patent: November 8, 2016Assignees: SK INNOVATION CO., LTD., SK GLOBAL CHEMICAL CO., LTD.Inventors: Tae Wook Kwon, Soo Young Hwang, Jin Su Ham, Ki Nam Chung, Jong Ho Lim, Sung Gi Lee
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Patent number: 9051262Abstract: The present invention provides an ester plasticizer for polyvinyl chloride (PVC) resin, epoxy resin or urethane resin and a method of preparing the same. More particularly, the present invention provides an ester plasticizer using triacetin and coconut oil-based biodiesel as raw materials, which can prepare a resin composition having excellent plasticizing efficiency and improved physical properties such as tensile strength and the like. When a polyvinyl chloride resin or the like is manufactured using the ester plasticizer, there are advantages in that an environment-friendly product having an excellent plasticizing efficiency and in that the physical properties such as hardness, tensile strength, etc. of the product are improved.Type: GrantFiled: February 28, 2011Date of Patent: June 9, 2015Assignees: SK INNOVATION CO., LTD., SK GLOBAL CHEMICAL CO., LTD.Inventors: Tae Wook Kwon, Sung Gi Lee, Ki Nam Chung, Seung Gweon Hong
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Publication number: 20140326313Abstract: Provided are a resin composition for an encapsulating film of a photovoltaic module, and a photovoltaic module us ing the same, and more particularly, a resin composition for an encapsulating film of a photovoltaic module, having low moisture permeability and excellent adhesiveness due to thermal compression, and a photovoltaic module using the same, and thus, in the case where the resin composition for an encapsulating film of a photovoltaic module is used for a front sheet, a back sheet, or both of the front and back sheets, of a photovoltaic module, the resin composition can be used without an adhesive due to excellent transparency and durability against ultraviolet light and high adhesive strength with respect to glass, and thus can exhibit excellent compatibility.Type: ApplicationFiled: October 17, 2012Publication date: November 6, 2014Applicants: SK INNOVATION CO., LTD., SK GLOVAL CHEMICAL CO., LTD.Inventors: Seung Gweon Hong, Min Ho Jeon, Kwang Jin Chung, Ki Nam Chung, Myung Ahn Ok, In Hun Son
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Publication number: 20140206835Abstract: Provided is a hot melt adhesive composition including aliphatic polycarbonate. With the hot melt adhesive composition according to the present invention, the pyrolysis temperature is low, such that the harmful gas is not generated at the time of waste treatment, resulting in providing an excellent environmentally friendly product. In addition, the hot melt adhesive composition has the low melting temperature to thereby be usable at low temperature and exhibit sufficient adhesive strength.Type: ApplicationFiled: July 27, 2012Publication date: July 24, 2014Applicants: SK GLOBAL CHEMICAL CO., LTD., SK INNOVATION CO., LTD.Inventors: Seung Gweon Hong, Min Ho Jeon, Kwang Jin Chung, Ki Nam Chung, Myung Ahn Ok, In Hun Son
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Publication number: 20140171616Abstract: Provided is a self-adhesive composition having excellent weather resistance, adhesive strength, transparency, and durability to durability against ultraviolet rays, containing aliphatic polycarbonate by copolymerization of carbon dioxide and at least one epoxide compound. Also, provided are a self-adhesive film for glass produced from the self-adhesive composition containing aliphatic polycarbonate and a use thereof.Type: ApplicationFiled: June 8, 2012Publication date: June 19, 2014Applicants: SK GLOBAL CHEMICAL CO., LTD., SK INNOVATION CO., LTD.Inventors: Seung Gweon Hong, Min Ho Jeon, Kwang Jin Chung, Ki Nam Chung, Myung Ahn Ok, In Hun Son
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Publication number: 20140107271Abstract: Provided are a plasticizer for a resin composition including any one or more selected from a polyvinyl chloride resin, a polyurethane resin, an epoxy resin, a polycarbonate resin or a biodegradable resin, which has excellent mechanical properties such as tensile strength, elongation and hardness, and shape processability, and particularly has excellent flexibility at low temperatures, does not cause bleeding because compatibility with the resins is good, and has excellent transparency, heat resistance, cold resistance and durability, and a resin composition including the same.Type: ApplicationFiled: May 17, 2012Publication date: April 17, 2014Inventors: Tae Wook Kwon, Soo Young Hwang, Jin Su Ham, Ki Nam Chung, Jong Ho Lim, Sung Gi Lee
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Publication number: 20130253095Abstract: This invention relates to a resin composition using a dicarboxylic acid diester derivative as a plasticizer, and particularly to a resin composition, which is obtained by adding the plasticizer to one or more resins selected from among aliphatic or aromatic polycarbonate resins, polyurethane resins, polyvinyl chloride resins and epoxy resins, and which has a low glass transition temperature (Tg) and can be easily processed and can impart flexibility to products. This plasticizer exhibits high plasticization efficiency, and a resin composition including the plasticizer can manifest a low glass transition temperature and good flexibility at low temperature, thus improving physical properties such as tensile strength, even when only a small amount of the plasticizer is added.Type: ApplicationFiled: November 28, 2011Publication date: September 26, 2013Applicant: SK Innovation Co., Ltd.Inventors: Seung Gweon Hong, Jin Su Ham, Tae Wook Kwon, Ki Nam Chung
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Publication number: 20130072611Abstract: The present invention provides an ester plasticizer for polyvinyl chloride (PVC) resin, epoxy resin or urethane resin and a method of preparing the same. More particularly, the present invention provides an ester plasticizer using triacetin and coconut oil-based biodiesel as raw materials, which can prepare a resin composition having excellent plasticizing efficiency and improved physical properties such as tensile strength and the like. When a polyvinyl chloride resin or the like is manufactured using the ester plasticizer, there are advantages in that an environment-friendly product having an excellent plasticizing efficiency and in that the physical properties such as hardness, tensile strength, etc. of the product are improved.Type: ApplicationFiled: February 28, 2011Publication date: March 21, 2013Applicants: SK GLOBAL CHEMICAL CO., LTD., SK INNOVATION CO., LTD.Inventors: Tae Wook Kwon, Sung Gi Lee, Ki Nam Chung, Seung Gweon Hong
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Publication number: 20120136101Abstract: The present invention relates to a novel ester-based plasticizer, and, more particularly, to an ester plasticizer, which is synthesized by esterifying a polyhydric alcohol and an alkylene oxide with an aliphatic carboxylic acid or an aromatic carboxylic acid. When a polyvinylchloride resin is manufactured using the ester-based plasticizer, there are advantages in that products having a high plasticizing efficiency can be obtained and in that products having excellent physical properties, such as hardness, tensile strength, etc., can be obtained.Type: ApplicationFiled: July 13, 2010Publication date: May 31, 2012Inventors: Seung Gweon Hong, Kwon Tae Wook, Ki Nam Chung, Hao Wang
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Publication number: 20120077914Abstract: The present invention relates to an ester compound using alicyclic polyhydric acid and to a plasticizer for plastics, particularly, polyvinylchloride (PVC), including the ester compound More particularly, the present invention relates to a plasticizer, which is derived by the esterification reaction of alicyclic polyhydric acid and alcohol. When a polyvinylchloride resin is manufactured using the plasticizer, there are advantages in that the obtained products are excellent in terms of plasticizing efficiency, and in that their physical properties, such as hardness, tensile strength and the like, can be improved.Type: ApplicationFiled: June 4, 2009Publication date: March 29, 2012Applicants: SK GLOBAL CHEMICAL CO., LTD., SK INNOVATION CO., LTD.Inventors: Ki Nam Chung, Seung Gweon Hong, Tae Wook Kwon, Ho Wang
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Patent number: 7214793Abstract: Disclosed is a method of preparing 10H-dibenzo[b,f][1,4]thiazepin-11-one, including reacting dithiosalicylic acid with 1-chloro-2-nitrobenzene in a basic aqueous solution in the presence or absence of a reducing agent, to prepare 2-(2-nitrophenylsulfuryl)benzoic acid; subjecting the 2-(2-nitrophenylsulfuryl)benzoic acid to nitro group reduction in the presence of hydrogen, a solvent and a heterogeneous metal catalyst, to prepare 2-(2-aminophenylsulfuryl)benzoic acid; and directly cyclizing the 2-(2-aminophenylsulfuryl)benzoic acid in an organic solvent in the presence or absence of an acid catalyst. The method according to the present invention is economical due to the use of the inexpensive starting material, and also environmentally friendly and efficient by minimizing the use of the organic solvent and performing direct cyclization without the activation of carboxylic acid.Type: GrantFiled: November 26, 2003Date of Patent: May 8, 2007Assignee: SK CorporationInventors: Byong-Sung Kwak, Ki-Nam Chung, Ki-Ho Koh, Hee-Jun Hwang
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Publication number: 20070066589Abstract: Disclosed is a method of preparing 10H-dibenzo[b,f][1,4]thiazepin-11-one, including reacting dithiosalicylic acid with 1-chloro-2-nitrobenzene in a basic aqueous solution in the presence or absence of a reducing agent, to prepare 2-(2-nitrophenylsulfuryl)benzoic acid; subjecting the 2-(2-nitrophenylsulfuryl)benzoic acid to nitro group reduction in the presence of hydrogen, a solvent and a heterogeneous metal catalyst, to prepare 2-(2-aminophenylsulfuryl)benzoic acid; and directly cyclizing the 2-(2-aminophenylsulfuryl)benzoic acid in an organic solvent in the presence or absence of an acid catalyst. The method according to the present invention is economical due to the use of the inexpensive starting material, and also environmentally friendly and efficient by minimizing the use of the organic solvent and performing direct cyclization without the activation of carboxylic acid.Type: ApplicationFiled: November 26, 2003Publication date: March 22, 2007Inventors: Byong-Sung Kwak, Ki-Nam Chung, Ki-Ho Koh, Hee-Jun Hwang
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Publication number: 20060052617Abstract: Disclosed is a continuous process for the production of optically pure (S)-?-hydroxy-?-butyrolactone having constantly maintained optical activity, consisting of hydrogenating 2-50 wt % of a substituted carboxylic acid derivative in a solvent using a fixed bed reactor filled with a precious metal catalyst-impregnated inorganic oxide carrier at 50-500° C. under pressure of 15-5,500 psig at weight-space-velocity of 0.1-10 h?1, in which a molar ratio of hydrogen to carboxylic acid derivative ranges from 2 to 10. The desired material can be produced in higher optical purity and at higher yield by the current process which is relatively simpler and environmentally safer than conventional processes. Additionally, increased production efficiency leads to production of the desired material on a large scale.Type: ApplicationFiled: September 18, 2002Publication date: March 9, 2006Applicant: SK CORPORATIONInventors: Byong-Sung Kwak, Ki-Nam Chung, Tae-Yun Kim, Ki-Ho Koh, Jin-Woong Kim, Sang-Il Lee
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Patent number: 6509504Abstract: Disclosed is a method for preparing serinol (2-amino-1,3-proanediol). From nitromethane, para-formaldehyde and sodium hydroxide, 1-nitro-1,3-propanediol sodium salt is prepared as a medical intermediate. In a fixed bed, this intermediate is allowed to undergo the continuous hydrogenation of 2-nitro-1,3-propanediol sodium salt and methanol as shown in reaction (1). In addition to being simple, the method is economically favorable and affords the high yield and high purity of serinol.Type: GrantFiled: December 12, 2001Date of Patent: January 21, 2003Assignee: SK CorporationInventors: Byong-Sung Kwak, Ki-Nam Chung, Choon-Gil Kim, Ki-Ho Koh
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Patent number: 6429319Abstract: Disclosed is a process for the production of optically pure (S)-beta-hydroxy-gamma-butyrolactone through the hydrogenation of substituted carboxylic acid derivatives. A solution containing 1 to 50% by weight of a substituted carboxylic acid derivative is fed at a WHSV of 0.1 to 10 h−1, to a fixed bed reactor which is filled with a catalyst and maintained at a reaction temperature of 50 to 550° C. under a halogen partial pressure of 15 to 5,500 psig. The catalyst is composed of a noble metal as a catalytically effective ingredient which is impregnated in an inorganic oxide as a support. The molar ratio of the hydrogen to the substituted carboxylic acid derivative is maintained at a molar ratio of 1:1 to 10:1. The process can produce optically pure (S)-beta-hydroxy-gamma-butyrolactone with higher purities at higher yields than can conventional techniques. In addition to being relatively simple and environmentally friendly, the process is so economically favorable as to apply to industrial production.Type: GrantFiled: January 22, 2001Date of Patent: August 6, 2002Assignee: SK CorporationInventors: Byong-Sung Kwak, Ki-Nam Chung, Tae-Yun Kim, Ki-Ho Koh, Jin-Woong Kim, Choon-Gil Kim
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Publication number: 20020035275Abstract: Disclosed is a process for the production of optically pure (S)-beta-hydroxy-gamma-butyrolactone through the hydrogenation of substituted carboxylic acid derivatives. A solution containing 1 to 50% by weight of a substituted carboxylic acid derivative is fed at a WHSV of 0.1 to 10 h−1, to a fixed bed reactor which is filled with a catalyst and maintained at a reaction temperature of 50 to 550° C. under a halogen partial pressure of 15 to 5,500 psig. The catalyst is composed of a noble metal as a catalytically effective ingredient which is impregnated in an inorganic oxide as a support. The molar ratio of the hydrogen to the substituted carboxylic acid derivative is maintained at a molar ratio of 1:1 to 10:1. The process can produce optically pure (S)-beta-hydroxy-gamma-butyrolactone with higher purities at higher yields than can conventional techniques. In addition to being relatively simple and environmentally friendly, the process is so economically favorable as to apply to industrial production.Type: ApplicationFiled: January 22, 2001Publication date: March 21, 2002Inventors: Byong-Sung Kwak, Ki-Nam Chung, Tae-Yun Kim, Ki-Ho Koh, Jin-Woong Kim, Choon-Gil Kim