Patents by Inventor Joon-Keun Min
Joon-Keun Min 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: 11639435Abstract: Disclosed is a method using a metallocene catalyst system so as to control the polymer structure of a diene-modified polypropylene through process simplification, thereby being capable of preparing a hyperbranched polypropylene resin having a low gel content and improved melt strength. The present invention provides a method using a catalyst so as to polymerize propylene and a diene compound, thereby preparing a diene-modified polypropylene resin having a branching index of 0.95 or less, a gel content of 3 wt % or less and an advanced rheometric expansion system (ARES) melt strength of 5 g or more.Type: GrantFiled: August 21, 2018Date of Patent: May 2, 2023Assignee: LOTTE CHEMICAL CORPORATIONInventors: Hyun Yul Woo, Rai Ha Lee, Su Jeong Jeong, Joon Keun Min, Eun Hye Shin, Byung Hun Chae
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Patent number: 11359040Abstract: Disclosed are a polyolefin having a high molecular weight by using a novel metallocene catalyst; a method for preparing the polyolefin by using the same; and a method for preparing an ethylene-propylene random copolymer having high molecular weight, high syndiotacticity and small crystal size, thereby providing injection molded articles with improved transparency.Type: GrantFiled: September 27, 2017Date of Patent: June 14, 2022Assignee: LOTTE CHEMICAL CORPORATIONInventors: Byung Hun Chae, Joon Keun Min, Sung Won Jung, Youn Jin Hong, Hyun Yul Woo
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Patent number: 11312796Abstract: Disclosed are a novel metallocene catalyst and a method for preparing a polyolefin having a high molecular weight and a low melt index by using the same. The present invention provides a transition metal compound represented by formula 1.Type: GrantFiled: April 9, 2020Date of Patent: April 26, 2022Assignee: LOTTE CHEMICAL CORPORATIONInventors: Joon Keun Min, Su Jeong Jeong, Hyun Yul Woo, Rai Ha Lee, Eun Hye Shin, Byung Hun Chae
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Publication number: 20220025083Abstract: The present invention relates to a high-melt-strength polypropylene resin, and a preparation method therefor. A method for preparing the high-melt-strength polypropylene resin, according to the present invention, comprises the steps of: creating a polypropylene by polymerizing propylene monomers in the presence of a metallocene catalyst; and putting a diene compound and a comonomer into the created polypropylene and unreacted propylene monomers and reacting same, thereby forming a C40 or greater long-chain branch on the main chain of the polypropylene.Type: ApplicationFiled: November 27, 2019Publication date: January 27, 2022Inventors: Su-Jeong JEONG, Hyun-Yul WOO, Joon-Keun MIN, Rai-Ha LEE, Eun-Hye SHIN, Byung-Hun CHAE
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Publication number: 20220010044Abstract: The present invention relates to a supported catalyst for propylene polymerization in which a first transition metal compound contributing to the production of crystalline polypropylene and a second transition metal compound contributing to the production of rubbery polypropylene are co-supported, and a method for producing a polypropylene resin using same. By using the supported catalyst, according to the present invention, it is possible to produce, by a single step of propylene polymerization, a polypropylene resin in which crystalline polypropylene and rubbery polypropylene are simultaneously formed.Type: ApplicationFiled: November 14, 2019Publication date: January 13, 2022Applicant: LOTTE CHEMICAL CORPORATIONInventors: Joon Keun Min, Eun Hye Shin, Rai Ha Lee, Hae In Lee, Su Jeong Jeong, Byung Hun Chae
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Publication number: 20220002448Abstract: The present invention relates to a supported catalyst for olefin polymerization, and a method for preparing a polyolefin by using same, the supported catalyst comprising: a main catalyst comprising a metallocene-based compound; a cocatalyst comprising an organoaluminum-based compound; an aromatic compound in which two or more polar groups selected from a hydroxyl group (—OH), an amine group (—NH2), a thiol group (—SH), a carboxyl group (—COOH) and an amide group (—CONH2) are bonded, and one or more halogen groups are bonded; and a support for supporting the main catalyst, the cocatalyst and the aromatic compound. When olefins are polymerized by using the supported catalyst of the present invention, the catalyst exhibits excellent activity and fouling can be reduced by inhibiting the generation of polyolefin fine powder.Type: ApplicationFiled: November 14, 2019Publication date: January 6, 2022Applicant: LOTTE CHEMICAL CORPORATIONInventors: Joon Keun Min, Hae In Lee, Rai Ha Lee, Eun Hye Shin, Su Jeong Jeong, Byung Hun Chae
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Publication number: 20210317239Abstract: Disclosed are a novel metallocene catalyst and a method for preparing a polyolefin having a high molecular weight and a low melt index by using the same. The present invention provides a transition metal compound represented by formula 1.Type: ApplicationFiled: April 9, 2020Publication date: October 14, 2021Applicant: LOTTE CHEMICAL CORPORATIONInventors: Joon Keun Min, Su Jeong Jeong, Hyun Yul Woo, Rai Ha Lee, Eun Hye Shin, Byung Hun Chae
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Publication number: 20210163725Abstract: Disclosed is a method using a metallocene catalyst system so as to control the polymer structure of a diene-modified polypropylene through process simplification, thereby being capable of preparing a hyperbranched polypropylene resin having a low gel content and improved melt strength. The present invention provides a method using a catalyst so as to polymerize propylene and a diene compound, thereby preparing a diene-modified polypropylene resin having a branching index of 0.95 or less, a gel content of 3 wt % or less and an advanced rheometric expansion system (ARES) melt strength of 5 g or more.Type: ApplicationFiled: August 21, 2018Publication date: June 3, 2021Applicant: LOTTE CHEMICAL CORPORATIONInventors: Hyun Yul Woo, Rai Ha Lee, Su Jeong Jeong, Joon Keun Min, Eun Hye Shin, Byung Hun Chae
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Patent number: 10875951Abstract: Disclosed is a propylene-diene copolymer resin having excellent melt tension, with improved melt strength, high molecular weight and broad molecular weight distribution by using a specific metallocene catalyst system. The present invention provides a propylene-diene copolymer resin produced by polymerizing propylene and a diene compound of C4-C20 by using a metallocene catalyst system, wherein the propylene-diene copolymer resin has the melt index (2.16 kg load at 230° C.) of 0.1-100 g/10 min and the melt tension (advanced rheometric expansion system (ARES)) of 5-100 g.Type: GrantFiled: April 6, 2017Date of Patent: December 29, 2020Assignee: LOTTE CHEMICAL CORPORATIONInventors: Byung Hun Chae, Hyun Yul Woo, Rai Ha Lee, Joon Keun Min, Sung Won Jung, Youn Jin Hong, Eun Hye Shin
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Publication number: 20190270833Abstract: Disclosed are a catalyst having a high molecular weight by using a novel metallocene catalyst; a method for preparing a polyolefin by using the same; and a method for preparing an ethylene-propylene random copolymer having a high molecular weight and ethylene syndiotactic index and having a small crystal size, thereby having improved transparency during injection. The present invention provides a transition metal compound represented by chemical formula 1.Type: ApplicationFiled: September 27, 2017Publication date: September 5, 2019Applicants: LOTTE CHEMICAL CORPORATION, LOTTE CHEMICAL CORPORATIONInventors: Byung Hun Chae, Joon Keun Min, Sung Won Jung, Youn Jin Hong, Hyun Yul Woo
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Publication number: 20190119427Abstract: Disclosed is a propylene-diene copolymer resin having excellent melt tension, with improved melt strength, high molecular weight and broad molecular weight distribution by using a specific metallocene catalyst system. The present invention provides a propylene-diene copolymer resin produced by polymerizing propylene and a diene compound of C4-C20 by using a metallocene catalyst system, wherein the propylene-diene copolymer resin has the melt index (2.16 kg load at 230° C.) of 0.1-100 g/10 min and the melt tension (advanced rheometric expansion system (ARES)) of 5-100 g.Type: ApplicationFiled: April 6, 2017Publication date: April 25, 2019Applicant: Lotte Chemical CorporationInventors: Byung Hun CHAE, Hyun Yul WOO, Rai Ha LEE, Joon Keun MIN, Sung Won JUNG, Youn Jin HONG, Eun Hye SHIN
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Patent number: 9159497Abstract: Disclosed herein are a copolymer having a low band gap and a preparing method thereof, and more specifically, a copolymer having a low band gap and other various and excellent physical properties, and a preparing method thereof.Type: GrantFiled: November 20, 2012Date of Patent: October 13, 2015Assignee: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGYInventors: Jae-Suk Lee, Ashraf A El-Shehawy, Joon-Keun Min, Abdo Nabiha Ibrahim Mahmoud Mahamed
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Patent number: 9040655Abstract: A method for producing a copolymer includes reacting a first monomer with a second monomer using a Pd-based catalyst, wherein the first monomer is a first hetero cyclic compound which includes a first hetero atom selected from S, N, and O, the first hetero cyclic compound in which a carbon atom adjacent to the first hetero atom is coupled with at least one hydrogen atom, and the second monomer is a second hetero cyclic compound which includes a second hetero atom selected from S, N, and O, the second hetero cyclic compound in which the second hetero atom is coupled with a carbon atom in which a halogen group selected from Br, Cl, and I is substituted.Type: GrantFiled: November 20, 2012Date of Patent: May 26, 2015Assignee: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGYInventors: Jae-Suk Lee, Ashraf A El-Shehawy, Joon-Keun Min, Abdo Nabiha Ibrahim Mahmoud Mahamed
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Publication number: 20140142263Abstract: Disclosed herein is a first example of effective direct position specific C—H arylation of thieno[3,4-b]pyrazine derivative and several hetero aryl bromide under the ‘Heck-type’ experiment condition using Pd(OAc)2/n-Bu4NBr as a catalyst system, thienopyrazine in which aryl is replaced to increase various values. The current synthesis methodology is a simpler method than a facial method and is used to prepare ?-conjugated oligomer and/or polymer material based on interesting hexylthiophen and thienopyrazine portion for electronic industries which construct a new synthetic organic material using potential application programs. The arylation generates more position selectivity in a C—H bond than in a pyrazine C—H bond. The optical and electrical characteristics of the synthesis copolymer are survey.Type: ApplicationFiled: November 20, 2012Publication date: May 22, 2014Applicant: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGYInventors: Jae-Suk Lee, Ashraf A EL-Shehawy, Joon-Keun Min, Abdo Nabiha Ibrahim Mahmoud Mahamed
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Publication number: 20140135460Abstract: Disclosed herein are a copolymer having a low band gap and a preparing method thereof, and more specifically, a copolymer having a low band gap and other various and excellent physical properties, and a preparing method thereof.Type: ApplicationFiled: November 20, 2012Publication date: May 15, 2014Inventors: Jae-Suk Lee, Ashraf A El-Shehawy, Joon-Keun Min, Abdo Nabiha Ibrahim Mahmoud Mahamed