Patents by Inventor Jung Rae LEE
Jung Rae LEE 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: 11926682Abstract: The present disclosure provides a method for preparing a polymerization initiator composition, including (a) a step of mixing water and a water-soluble initiator to prepare an aqueous initiator solution having a concentration of 1 to 10%; and (b) a step of activating the aqueous initiator solution, wherein the step of activating is performed by (b-1) a step of heat treating the aqueous initiator solution for 0.5 to 4.5 hours at a temperature of 48 to 62° C.; and (b-2) a step of treating the aqueous initiator solution to achieve pH of 1 to 7, where the steps above are performed in no particular order.Type: GrantFiled: October 7, 2019Date of Patent: March 12, 2024Assignee: LG CHEM LTD.Inventors: Heung Kwon Bae, Kyung Seog Youk, Jung Rae Lee, Hyun Min Lee, Joong Chul Lim, Min Jeong Kang
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Patent number: 11912810Abstract: The present disclosure provides a composition for preparing a vinyl chloride-based polymer, including a vinyl chloride-based first seed; a vinyl chloride-based second seed; an initiator composition including a water-soluble initiator and an oil-soluble initiator; a reducing agent; and a vinyl chloride-based monomer, wherein a metal catalyst is not included in the composition, and a method for preparing a vinyl chloride-based polymer using the same.Type: GrantFiled: October 7, 2019Date of Patent: February 27, 2024Assignee: LG CHEM, LTD.Inventors: Kyung Seog Youk, Heung Kwon Bae, Jung Rae Lee, Hyun Min Lee, Joong Chul Lim, Min Jeong Kang
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Publication number: 20240002568Abstract: The present disclosure relates to a method of preparing a polymer including preparing a first polymer mixture by polymerizing while continuously adding a monomer mixture comprising a (meth)acrylate-based monomer, a vinyl aromatic monomer, and a first vinyl cyanide-based monomer to a first reactor; and preparing a second polymer mixture by polymerizing while continuously adding a second vinyl cyanide-based monomer and the first polymer mixture to a second reactor, wherein a starting time of the continuous addition of the second vinyl cyanide-based monomer and the first polymer mixture is a time when a polymerization conversion rate is 40.0 to 55.0%, and a weight ratio of the first vinyl cyanide-based monomer and the second vinyl cyanide-based monomer is 10:90 to 35:65.Type: ApplicationFiled: August 17, 2022Publication date: January 4, 2024Applicant: LG CHEM, LTD.Inventors: Jae Bum SEO, Dae Woo LEE, Jung Tae PARK, Jung Rae LEE, Ji Uk JANG, Kyeong Soo SHIN
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Publication number: 20230250210Abstract: The present disclosure relates to a method of preparing a graft polymer, which includes: performing primary continuous polymerization by adding a diene-based rubber polymer and an aromatic vinyl-based monomer to a first reactor; and performing secondary continuous polymerization by adding the polymerization product discharged from the first reactor, a maleimide-based monomer, and a vinyl cyanide-based monomer to a second reactor.Type: ApplicationFiled: November 19, 2021Publication date: August 10, 2023Applicant: LG CHEM, LTD.Inventors: Ji Uk JANG, Dae Woo LEE, Jae Bum SEO, Jung Tae PARK, Jung Rae LEE
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Publication number: 20220348695Abstract: The present invention provides a post-treatment method of a vinyl chloride-based polymer including: (a) preparing a stream containing vinyl chloride-based polymer powder and unreacted vinyl chloride-based monomers by drying a vinyl chloride-based polymer latex in a drying unit; (b) filtering the stream containing the vinyl chloride-based polymer powder and the unreacted vinyl chloride-based monomers in a filtering unit; and (c) recirculating a gas containing the unreacted vinyl chloride-based monomers discharged from the filtering unit to a latex storage unit.Type: ApplicationFiled: June 22, 2020Publication date: November 3, 2022Inventors: Heung Kwon BAE, Hyun Min LEE, Kyung Seog YOUK, Joong Chul LIM, Se Woong LEE, Jung Rae LEE
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Publication number: 20220220232Abstract: The present invention provides a method for preparing a vinyl chloride-based polymer, the method including (1) polymerizing a vinyl chloride-based monomer in the presence of a vinyl chloride-based first seed particle, a vinyl chloride-based second seed particle, and an emulsifier and (2) separating, after the polymerizing, a first vinyl chloride-based polymer and a second vinyl chloride-based polymer which are in a particulate form, wherein the separated first vinyl chloride-based polymer is dried using a fluid bed dryer (FBD), and the first vinyl chloride-based polymer has a smaller average particle diameter (D50) than the second vinyl chloride-based polymer, and two kinds of polymers having different physical properties may be prepared through a single manufacturing process.Type: ApplicationFiled: September 25, 2020Publication date: July 14, 2022Inventors: Se Woong LEE, Heung Kwon BAE, Hyun Min LEE, Kyung Seog YOUK, Joong Chul LIM, Jung Rae LEE
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Patent number: 11124639Abstract: The present invention relates to a vinyl chloride-based polymer showing high viscosity properties in a low shear region and showing viscosity and stress decreasing properties in line with the increase of a shear rate, a method for preparing the same, and a plastisol comprising the same. Since the vinyl chloride-based polymer comprises a saponified emulsifier in a specific ratio, high viscosity properties may be shown in a low shear region, and Bingham fluid flow properties may be shown, by which viscosity and stress decrease in line with the increase of a shear rate.Type: GrantFiled: September 29, 2016Date of Patent: September 21, 2021Assignee: LG CHEM, LTD.Inventors: Heung Kwon Bae, Kyung Seog Youk, Jung Rae Lee, Hyun Min Lee
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Publication number: 20210198388Abstract: The present disclosure provides a method for preparing a polymerization initiator composition, including (a) a step of mixing water and a water-soluble initiator to prepare an aqueous initiator solution having a concentration of 1 to 10%; and (b) a step of activating the aqueous initiator solution, wherein the step of activating is performed by (b-1) a step of heat treating the aqueous initiator solution for 0.5 to 4.5 hours at a temperature of 48 to 62° C.; and (b-2) a step of treating the aqueous initiator solution to achieve pH of 1 to 7, where the steps above are performed in no particular order.Type: ApplicationFiled: October 7, 2019Publication date: July 1, 2021Inventors: Heung Kwon BAE, Kyung Seog YOUK, Jung Rae LEE, Hyun Min LEE, Joong Chul LIM, Min Jeong KANG
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Publication number: 20210087303Abstract: The present disclosure provides a composition for preparing a vinyl chloride-based polymer, including a vinyl chloride-based first seed; a vinyl chloride-based second seed; an initiator composition including a water-soluble initiator and an oil-soluble initiator; a reducing agent; and a vinyl chloride-based monomer, wherein a metal catalyst is not included in the composition, and a method for preparing a vinyl chloride-based polymer using the same.Type: ApplicationFiled: October 7, 2019Publication date: March 25, 2021Inventors: Kyung Seog Youk, Heung Kwon Bae, Jung Rae Lee, Hyun Min Lee, Joong Chul Lim, Min Jeong Kang
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Patent number: 10752709Abstract: The present invention relates to a vinyl chloride-based polymer composition and a method for producing the same, and more particularly, to a vinyl chloride-based polymer composition including a vinyl chloride-based polymer and a plasticizer, wherein the vinyl chloride-based polymer includes a higher fatty acid having 10 to 18 carbon atoms in an amount of more than 0.05 parts by weight to less than 2.0 parts by weight, based on 100 parts by weight of the vinyl chloride-based polymer.Type: GrantFiled: October 12, 2017Date of Patent: August 25, 2020Assignee: LG CHEM, LTD.Inventors: Jung Rae Lee, Kyung Seog Youk, Heung Kwon Bae, Hyun Min Lee
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Patent number: 10676548Abstract: The present invention relates to a vinyl chloride-based polymer, a method of preparing the same, and a plastisol including the vinyl chloride-based polymer. The vinyl chloride-based polymer according to the present invention may exhibit high viscosity characteristics in a low shear region by having particle size distribution characteristics, in which particles having a relatively small particle diameter and particles having a relatively large particle diameter are distributed at a specific ratio, and may exhibit low viscosity characteristics in a high shear region due to small increases in viscosity and stress as shear rate increases, and thus, the vinyl chloride-based polymer may be easily used in a spray coating process. Therefore, the vinyl chloride-based polymer according to the present invention and the method of preparing the same may be easily applied to industries that need them, for example, vinyl chloride-based resin industry for paste processing.Type: GrantFiled: November 15, 2016Date of Patent: June 9, 2020Assignee: LG CHEM LTD.Inventors: Kyung Seog Youk, Heung Kwon Bae, Hyun Min Lee, Jung Rae Lee
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Patent number: 10301407Abstract: The present invention relates to a vinyl chloride-based polymer which has improved thermal stability and a method for preparing the same. The vinyl chloride-based polymer includes silicate compound derived units, and a dehydrochloric acid (dehydrochlorination) reaction due to heat or ultraviolet rays may be suppressed, and thus, thermal stability may be improved, and discoloration and deformation of physical properties may be prevented. Accordingly, the vinyl chloride-based polymer and the method for preparing the same may be readily applied to industries requiring a vinyl chloride-based polymer, for example, industries related to a vinyl chloride-based resin and molded articles thereof.Type: GrantFiled: October 7, 2016Date of Patent: May 28, 2019Assignee: LG Chem, Ltd.Inventors: Jung Rae Lee, Kyung Seog Youk, Heung Kwon Bae, Hyun Min Lee
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Patent number: 10227424Abstract: The present invention relates to a method of preparing a vinyl chloride polymer having good thermal stability due to the restraint of dehydrochlorination by heat or ultraviolet rays, and a vinyl chloride polymer prepared thereby. In the preparation method through bulk polymerization, a modifier is introduced to a polymerization process to impart the vinyl chloride polymer with high thermal stability without inducing modification. Therefore, the preparation method via the bulk polymerization of the vinyl chloride polymer and the vinyl chloride polymer prepared thereby according to the present invention may be readily applied to industries requiring thereof such as industries concerning a vinyl chloride resin and the molded article thereof.Type: GrantFiled: September 14, 2015Date of Patent: March 12, 2019Assignee: LG CHEM, LTD.Inventors: Kyung Seog Youk, Heung Kwon Bae, Jung Rae Lee, Kyung Hyun Kim, Hyun Min Lee
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Publication number: 20190055331Abstract: The present invention relates to a vinyl chloride-based polymer composition and a method for producing the same, and more particularly, to a vinyl chloride-based polymer composition including a vinyl chloride-based polymer and a plasticizer, wherein the vinyl chloride-based polymer includes a higher fatty acid having 10 to 18 carbon atoms in an amount of more than 0.05 parts by weight to less than 2.0 parts by weight, based on 100 parts by weight of the vinyl chloride-based polymer.Type: ApplicationFiled: October 12, 2017Publication date: February 21, 2019Inventors: Jung Rae LEE, Kyung Seog YOUK, Heung Kwon BAE, Hyun Min LEE
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Patent number: 10040878Abstract: The present invention relates to a vinyl chloride polymer having good thermal stability due to the restraint of dehydrochlorination by heat or ultraviolet rays, and a method of preparing the same. The generation of the dehydrochlorination of the vinyl chloride polymer due to heat or ultraviolet rays may be markedly restrained, the thermal stability thereof may be improved, and the discoloration thereof or the modification of the physical properties thereof may be prevented. In addition, a modifier may be introduced to a polymerization process at the end of the polymerization, and high thermal stability may be attained without generating the transformation of the vinyl chloride polymer.Type: GrantFiled: September 14, 2015Date of Patent: August 7, 2018Assignee: LG CHEM, LTD.Inventors: Kyung Seog Youk, Hyun Min Lee, Chan Hee Lee, Heung Kwon Bae, Kwang Jin Lee, Kyung Hyun Kim, Jung Rae Lee
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Publication number: 20180134822Abstract: The present invention relates to a vinyl chloride-based polymer, a method of preparing the same, and a plastisol including the vinyl chloride-based polymer. The vinyl chloride-based polymer according to the present invention may exhibit high viscosity characteristics in a low shear region by having particle size distribution characteristics, in which particles having a relatively small particle diameter and particles having a relatively large particle diameter are distributed at a specific ratio, and may exhibit low viscosity characteristics in a high shear region due to small increases in viscosity and stress as shear rate increases, and thus, the vinyl chloride-based polymer may be easily used in a spray coating process. Therefore, the vinyl chloride-based polymer according to the present invention and the method of preparing the same may be easily applied to industries that need them, for example, vinyl chloride-based resin industry for paste processing.Type: ApplicationFiled: November 15, 2016Publication date: May 17, 2018Inventors: Kyung Seog YOUK, Heung Kwon BAE, Hyun Min LEE, Jung Rae LEE
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Publication number: 20180057676Abstract: The present invention relates to a vinyl chloride-based polymer showing high viscosity properties in a low shear region and showing viscosity and stress decreasing properties in line with the increase of a shear rate, a method for preparing the same, and a plastisol comprising the same. Since the vinyl chloride-based polymer comprises a saponified emulsifier in a specific ratio, high viscosity properties may be shown in a low shear region, and Bingham fluid flow properties may be shown, by which viscosity and stress decrease in line with the increase of a shear rate.Type: ApplicationFiled: September 29, 2016Publication date: March 1, 2018Inventors: Heung Kwon BAE, Kyung Seog YOUK, Jung Rae LEE, Hyun Min LEE
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Publication number: 20180016371Abstract: The present invention relates to a vinyl chloride-based polymer which has improved thermal stability and a method for preparing the same. The vinyl chloride-based polymer includes silicate compound derived units, and a dehydrochloric acid (dehydrochlorination) reaction due to heat or ultraviolet rays may be suppressed, and thus, thermal stability may be improved, and discoloration and deformation of physical properties may be prevented. Accordingly, the vinyl chloride-based polymer and the method for preparing the same may be readily applied to industries requiring a vinyl chloride-based polymer, for example, industries related to a vinyl chloride-based resin and molded articles thereof.Type: ApplicationFiled: October 7, 2016Publication date: January 18, 2018Applicant: LG CHEM, LTD.Inventors: Jung Rae LEE, Kyung Seog YOUK, Heung Kwon BAE, Hyun Min LEE
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Patent number: 9688793Abstract: The present invention relates to a method of preparing a vinyl chloride polymer having good thermal stability by restraining a dehydrochlorination reaction due to heat or ultraviolet rays, and a vinyl chloride polymer prepared thereby. According to the preparation method, the adding point of a modifier is controlled, and a vinyl chloride polymer markedly restraining the generation of dehydrochloric acid due to heat or ultraviolet rays may be prepared. Therefore, the preparation method of the vinyl chloride polymer via the emulsion polymerization and the vinyl chloride polymer prepared thereby in the present invention may be readily applied to industries requiring the vinyl chloride polymer such as industries concerning a vinyl chloride resin and a molded article.Type: GrantFiled: September 14, 2015Date of Patent: June 27, 2017Assignee: LG Chem, Ltd.Inventors: Kyung Seog Youk, Hyun Min Lee, Chan Hee Lee, Heung Kwon Bae, Kwang Jin Lee, Kyung Hyun Kim, Jung Rae Lee
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Patent number: 9617364Abstract: The present invention relates to a method of preparing a vinyl chloride polymer having good thermal stability due to the restraint of dehydrochlorination by heat or ultraviolet rays, and a vinyl chloride polymer prepared thereby. In the preparation method, a modifier is introduced at the end of a polymerization process to impart the vinyl chloride polymer with high thermal stability without inducing modification. Therefore, the generation of dehydrochlorination due to heat or ultraviolet rays may be markedly restrained, thermal stability may be improved, and discoloration or the modification of physical properties may be prevented in the vinyl chloride polymer thus prepared.Type: GrantFiled: September 14, 2015Date of Patent: April 11, 2017Assignee: LG Chem, Ltd.Inventors: Kyung Seog Youk, Kyung Hyun Kim, Hyun Min Lee, Yong Jin Kim, Heung Kwon Bae, Jung Rae Lee