Patents by Inventor Sujith Sudevan
Sujith Sudevan 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: 9481762Abstract: The present invention relates to a method of manufacturing a polycarbonate including the process of copolymerizing epoxide compound and CO2 using cobalt(III) or chromium(III), where the ligands contains at least 3 ammonium cations, central metal has formal ?1 charge, and conjugated anions of the two cationic ammonium groups are acid-base homoconjugation, as catalyst. According to the present invention, the initial induction time can be reduced when the polycarbonate is manufactured and it is possible to improve the activity of the catalyst and the molecular weight of the obtained polymer.Type: GrantFiled: February 6, 2015Date of Patent: November 1, 2016Assignee: SK Innovation Co., Ltd.Inventors: Jisu Jeong, Sujith Sudevan, Myung Ahn Ok, Jieun Yoo, BunYeoul Lee, Sung-Jae Na
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Patent number: 9371420Abstract: There is provided a method for preparing a low-molecular weight poly(alkylene carbonate) of which the molecular weight and chain shape are precisely controlled, by introducing a phosphorous compound having a hydroxyl group as a chain transfer agent in order to regulate the molecular weight, in alternating copolymerizing an epoxide compound and carbon dioxide by using trivalent metal complex prepared from a Salen type ligand containing a quaternary ammonium salt, and a polymer prepared by the method. Since poly(alkylene carbonate) prepared according to the present invention includes a phosphate or phosphonate group in the polymer chain, it has flame-retarding property.Type: GrantFiled: September 9, 2014Date of Patent: June 21, 2016Assignee: SK Innovation Co., Ltd.Inventors: Jisu Jeong, SungJae Na, Sujith Sudevan, MyungAhn Ok, YongGyu Han, KwangJin Chung, BunYeoul Lee, Anish Cyriac, SangHwan Lee
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Patent number: 9284407Abstract: Provided is preparation of poly(alkylene carbonate) through alternating copolymerization of carbon dioxide and epoxide. According to the disclosure, by introducing a diepoxide compound to alternating copolymerization of carbon dioxide and epoxide compound using a metal(III) prepared with salen-type ligands containing quaternary ammonium salt as a catalyst, some of the polymer chains may be cross-linked to thus increase an average molecular weight of the copolymer and extend a distribution of molecular weight. A resin prepared according to this method may have high mechanical strength and rheological advantages.Type: GrantFiled: June 13, 2014Date of Patent: March 15, 2016Assignee: SK INNOVATION CO., LTD.Inventors: Ji Su Jeong, Sung Jae Na, Sujith Sudevan, Myung Ahn Ok, Yong Gyu Han, Kwang Jin Chung, Bun Yeoul Lee, Anish Cyriac
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Publication number: 20150299239Abstract: Provided are a complex synthesized from a novel tridentate ligand including an ammonium salt and a process of producing polycarbonate by copolymerization of carbon dioxide and epoxide using the same as a catalyst. A novel tridentate complex may be cheaply prepared as compared to the existing tetradentate complex containing four ammonium salts but have an advantage in that the novel tridentate complex may have an activity at a level similar to that of the existing tetradentate complex by adopting a cis-? conformation. Further, since in the tridentate complex, the number of ammonium salt serving as an initiator is small but the number of vacant sites is large as compared to the tetradentate complex containing four ammonium salts, the tridentate complex may have excellent activity.Type: ApplicationFiled: January 21, 2014Publication date: October 22, 2015Inventors: Cyriac ANISH, So Hee SIM, Myung Ahn OK, Ji Su JEONG, Il Gu JUNG, Jeon Koo LEE, Sujith SUDEVAN, Kyung Yeon KANG, Jeong Hyun NOH, Sung Jae NA
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Publication number: 20150175743Abstract: The present invention relates to a method of manufacturing a polycarbonate including the process of copolymerizing epoxide compound and CO2 using cobalt(III) or chromium(III), where the ligands contains at least 3 ammonium cations, central metal has formal ?1 charge, and conjugated anions of the two cationic ammonium groups are acid-base homoconjugation, as catalyst. According to the present invention, the initial induction time can be reduced when the polycarbonate is manufactured and it is possible to improve the activity of the catalyst and the molecular weight of the obtained polymer.Type: ApplicationFiled: February 6, 2015Publication date: June 25, 2015Inventors: Jisu Jeong, Sujith Sudevan, Myung Ahn OK, Jieun Yoo, BunYeoul Lee, Sung-Jae Na
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Patent number: 9023979Abstract: This invention relates to a method of preparing poly(alkylene carbonate) that has a molecular weight and polymer chain structure precisely controlled by adding a chain transfer agent composed of a compound having an alcohol or carboxylic acid functional group upon alternating copolymerization of an epoxide compound and carbon dioxide using a catalyst composed of a trivalent metal complex compound synthesized from a quaternary ammonium salt-containing Salen type ligand, and to a polymer compound prepared thereby. According to this invention, the polymer compound having a star-shaped chain as well as the polymer having a linear chain can be prepared. The low-molecular-weight poly(alkylene carbonate) has an —OH terminal group and can be used alone as a coating agent, etc., and also in mixtures with an isocyanate compound and thus can be easily utilized to prepare polyurethane.Type: GrantFiled: June 26, 2013Date of Patent: May 5, 2015Assignee: SK Innovation Co., Ltd.Inventors: JiSu Jeong, SungJae Na, Sujith Sudevan, MyungAhn Ok, Young Gyu Han, KwangJin Chung, BunYeoul Lee, Anish Cyriac
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Patent number: 8987411Abstract: The present invention related to a method of manufacturing a polycarbonate including the process of copolymerizing epoxide compound and CO2 using cobalt(III) or chromium(III), where the ligands contains at least 3 ammonium cations, central metal has formal ?1 charge, and conjugated anions of the two cationic ammonium groups are acid-base homoconjugation, as catalyst. According to the present invention, the initial induction time can be reduced when the said polycarbonate is manufactured and it is possible to improve the activity of the catalyst and the molecular weight of the obtained polymer.Type: GrantFiled: June 17, 2010Date of Patent: March 24, 2015Assignee: SK Innovation Co., Ltd.Inventors: Jisu Jeong, Sujith Sudevan, Myungahn Ok, Jieun Yoo, BunYeoul Lee, SungJae Na
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Patent number: 8981043Abstract: The present invention related to a method of manufacturing a polycarbonate including the process of copolymerizing epoxide compound and CO2 using cobalt(III) or chromium(III), where the ligands contains at least 3 ammonium cations, central metal has formal ?1 charge, and conjugated anions of the two cationic ammonium groups are acid-base homoconjugation, as catalyst. According to the present invention, the initial induction time can be reduced when the said polycarbonate is manufactured and it is possible to improve the activity of the catalyst and the molecular weight of the obtained polymer.Type: GrantFiled: September 12, 2012Date of Patent: March 17, 2015Assignee: SK Innovation Co., Ltd.Inventors: Jisu Jeong, Sujith Sudevan, Myungahn Ok, Jieun Yoo, BunYeoul Lee, SungJae Na
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Publication number: 20140378651Abstract: There is provided a method for preparing a low-molecular weight poly(alkylene carbonate) of which the molecular weight and chain shape are precisely controlled, by introducing a phosphorous compound having a hydroxyl group as a chain transfer agent in order to regulate the molecular weight, in alternating copolymerizing an epoxide compound and carbon dioxide by using trivalent metal complex prepared from a Salen type ligand containing a quaternary ammonium salt, and a polymer prepared by the method. Since poly(alkylene carbonate) prepared according to the present invention includes a phosphate or phosphonate group in the polymer chain, it has flame-retarding property.Type: ApplicationFiled: September 9, 2014Publication date: December 25, 2014Inventors: Jisu Jeong, SungJae Na, Sujith Sudevan, MyungAhn Ok, YongGyu Han, KwangJin Chung, BunYeoul Lee, Anish Cyriac, SangHwan Lee
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Patent number: 8912307Abstract: There is provided a method for preparing a low-molecular weight poly(alkylene carbonate) of which the molecular weight and chain shape are precisely controlled, by introducing a phosphorous compound having a hydroxyl group as a chain transfer agent in order to regulate the molecular weight, in alternating copolymerizing an epoxide compound and carbon dioxide by using trivalent metal complex prepared from a Salen type ligand containing a quaternary ammonium salt, and a polymer prepared by the method. Since poly(alkylene carbonate) prepared according to the present invention includes a phosphate or phosphonate group in the polymer chain, it has flame-retarding property.Type: GrantFiled: February 9, 2012Date of Patent: December 16, 2014Assignee: SK Innovation Co., Ltd.Inventors: Jisu Jeong, SungJae Na, Sujith Sudevan, MyungAhn Ok, YongGyu Han, KwangJin Chung, BunYeoul Lee, Anish Cyriac, SangHwan Lee
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Patent number: 8900483Abstract: Disclosed is a polymer electrolyte composition, a gel-type polymer electrolyte obtained by mixing the same at normal temperature, and a dye-sensitized solar cell containing the electrolyte. Since the poly(alkylene carbonate)-based polymer is included, a crosslinking process by radiation of heat or UV is not required when the polymer electrolyte is manufactured, such that a manufacturing process is simple. Accordingly, the polymer electrolyte is useful for mass production of a solar cell and maintained in a uniform state without a phase separation between two components due to excellent affinity between the polymer and the organic solvent included in the electrolyte, and has excellent electrode-electrolyte interface property in the solar cell due to an adhesive property of the gelled polymer electrolyte.Type: GrantFiled: March 27, 2012Date of Patent: December 2, 2014Assignees: SK Innovation Co., Ltd., SK Global Chemical Co., Ltd.Inventors: Yonggyu Han, Sujith Sudevan, MyungAhn Ok, Jisu Jeong, SungJae Na, KwangJin Chung, Dong-Won Kim, YeonJeong Choi
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Patent number: 8871898Abstract: Provided is a method for preparing poly(alkylene carbonate) containing ether linkages, by the copolymerization of an epoxy compound and carbon dioxide, with a trivalent metal complex prepared from a salen type ligand containing a quaternary ammonium salt, and a double metal cyanide (DMC) catalyst together. The amount of ether linkages can be controlled by regulating the weight ratio of two catalysts and the carbon dioxide pressure.Type: GrantFiled: February 27, 2012Date of Patent: October 28, 2014Assignees: SK Innovation Co., Ltd., SK Global Chemical Co., Ltd.Inventors: JiSu Jeong, SungJae Na, Sujith Sudevan, MyungAhn Ok, YongGyu Han, KwangJin Chung, BunYeoul Lee, Kodiyan Varghese Jobi
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Publication number: 20140296474Abstract: Provided is preparation of poly(alkylene carbonate) through alternating copolymerization of carbon dioxide and epoxide. According to the disclosure, by introducing a diepoxide compound to alternating copolymerization of carbon dioxide and epoxide compound using a metal(III) prepared with salen-type ligands containing quaternary ammonium salt as a catalyst, some of the polymer chains may be cross-linked to thus increase an average molecular weight of the copolymer and extend a distribution of molecular weight. A resin prepared according to this method may have high mechanical strength and rheological advantages.Type: ApplicationFiled: June 13, 2014Publication date: October 2, 2014Inventors: Ji Su JEONG, Sung Jae NA, Sujith SUDEVAN, Myung Ahn OK, Yong Gyu HAN, Kwang Jin CHUNG, Bun Yeoul LEE, Anish CYRIAC
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Patent number: 8785592Abstract: Provided is preparation of poly(alkylene carbonate) through alternating copolymerization of carbon dioxide and epoxide. According to the disclosure, by introducing a diepoxide compound to alternating copolymerization of carbon dioxide and epoxide compound using a metal(III) prepared with salen-type ligands containing quaternary ammonium salt as a catalyst, some of the polymer chains may be cross-linked to thus increase an average molecular weight of the copolymer and extend a distribution of molecular weight. A resin prepared according to this method may have high mechanical strength and rheological advantages.Type: GrantFiled: September 7, 2011Date of Patent: July 22, 2014Assignee: SK Innovation Co., Ltd.Inventors: Ji Su Jeong, Sung Jae Na, Sujith Sudevan, Myung Ahn Ok, Yong Gyu Han, Kwang Jin Chung, Bun Yeoul Lee, Anish Cyriac
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Publication number: 20140163179Abstract: Provided is preparation of poly(alkylene carbonate) by alternating copolymerization of carbon dioxide and epoxide. To be specific, provided are a method for preparing block or graft copolymers of the polymer compound and poly(alkylene carbonate) by alternating-copolymerization of an epoxide compound and carbon dioxide by using a metal (III) compound prepared from salen-type ligand with a quaternary ammonium salt as a catalyst in the presence of a polymer compound having a functional group of hydroxyl or carboxylic acid, and block or graft copolymers prepared by the method.Type: ApplicationFiled: January 10, 2014Publication date: June 12, 2014Applicant: SK Innovation Co., Ltd.Inventors: JiSu Jeong, SungJae Na, Sujith Sudevan, MyungAhn Ok, YongGyu Han, KwangJin Chung, Bun Yeoul Lee, Anish Cyriac, SangHwan Lee
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Patent number: 8637634Abstract: Provided is preparation of poly(alkylene carbonate) by alternating copolymerization of carbon dioxide and epoxide. To be specific, provided are a method for preparing block or graft copolymers of the polymer compound and poly(alkylene carbonate) by alternating-copolymerization of an epoxide compound and carbon dioxide by using a metal (III) compound prepared from salen-type ligand with a quaternary ammonium salt as a catalyst in the presence of a polymer compound having a functional group of hydroxyl or carboxylic acid, and block or graft copolymers prepared by the method.Type: GrantFiled: February 28, 2011Date of Patent: January 28, 2014Assignee: SK Innovation Co., Ltd.Inventors: JiSu Jeong, SungJae Na, Sujith Sudevan, MyungAhn Ok, YongGyu Han, KwangJin Chung, Bun Yeoul Lee, Anish Cyriac, SangHwan Lee
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Patent number: 8598309Abstract: This invention relates to a Salen type ligand including three or more quaternary ammonium salts of nitrate anions, to a trivalent metal complex compound prepared from this ligand and a method of preparing the same, to a method of preparing polycarbonate by copolymerizing an epoxide compound and carbon dioxide using the complex compound as a catalyst, and to a method of separating and collecting the catalyst from the copolymer after copolymerization. This catalyst used to copolymerize an epoxide compound and carbon dioxide can be more simply prepared, and has lower catalyst preparation and recovery costs, and higher activity, compared to conventional catalysts.Type: GrantFiled: February 23, 2011Date of Patent: December 3, 2013Assignee: SK Innovation Co., Ltd.Inventors: Ji Su Jeong, Sujith Sudevan, Myung Ahn Ok, Sung Jae Na, Yong Gyu Han, Kwang Jin Chung, Bun Yeoul Lee, Kodiyan Varghese Jobi
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Publication number: 20130289297Abstract: This invention relates to a method of preparing poly(alkylene carbonate) that has a molecular weight and polymer chain structure precisely controlled by adding a chain transfer agent composed of a compound having an alcohol or carboxylic acid functional group upon alternating copolymerization of an epoxide compound and carbon dioxide using a catalyst composed of a trivalent metal complex compound synthesized from a quaternary ammonium salt-containing Salen type ligand, and to a polymer compound prepared thereby. According to this invention, the polymer compound having a star-shaped chain as well as the polymer having a linear chain can be prepared. The low-molecular-weight poly(alkylene carbonate) has an —OH terminal group and can be used alone as a coating agent, etc., and also in mixtures with an isocyanate compound and thus can be easily utilized to prepare polyurethane.Type: ApplicationFiled: June 26, 2013Publication date: October 31, 2013Inventors: JiSu Jeong, SungJae Na, Sujith Sudevan, MyungAhn Ok, Young Gyu Han, KwangJin Chung, BunYeoul Lee, Anish Cyriac
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Patent number: 8546514Abstract: Disclosed is a continuous process for manufacturing aliphatic polycarbonate by polymerizing carbon dioxide and one or more epoxide compound in the presence of catalyst, in which carbon dioxide, one or more epoxide compound, and the catalyst are continuously supplied to polymerization reactor to produce aliphatic polycarbonate, separate unreacted carbon dioxide and epoxide compound and recycle them as raw materials.Type: GrantFiled: September 2, 2010Date of Patent: October 1, 2013Assignee: SK Innovation Co., Ltd.Inventors: Byoungmu Chang, Gwangbin Moon, Myungahn Ok, Jisu Jeong, Jieun Yoo, Sun Choi, Hongdae Kim, Sujith Sudevan, Daeho Shin, Jaeho Lee, Seongjun Lee, Gyungrok Kim, Mingyoo Park, Jangjae Lee
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Patent number: 8530616Abstract: This invention relates to a method of preparing poly(alkylene carbonate) that has a molecular weight and polymer chain structure precisely controlled by adding a chain transfer agent composed of a compound having an alcohol or carboxylic acid functional group upon alternating copolymerization of an epoxide compound and carbon dioxide using a catalyst composed of a trivalent metal complex compound synthesized from a quaternary ammonium salt-containing Salen type ligand, and to a polymer compound prepared thereby. According to this invention, the polymer compound having a star-shaped chain as well as the polymer having a linear chain can be prepared. The low-molecular-weight poly(alkylene carbonate) has an —OH terminal group and can be used alone as a coating agent, etc., and also in mixtures with an isocyanate compound and thus can be easily utilized to prepare polyurethane.Type: GrantFiled: November 23, 2010Date of Patent: September 10, 2013Assignee: SK Innovation Co., Ltd.Inventors: Jisu Jeong, SungJae Na, Sujith Sudevan, Myungahn Ok, YoungGyu Han, KwangJin Chung, Bun Yeoul Lee, Anish Cyriac