Patents by Inventor Jae-bum Seo
Jae-bum Seo 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: 11884808Abstract: The present invention relates to a thermoplastic resin composition, which includes a first copolymer formed by polymerizing a monomer mixture of a (meth)acrylate-based monomer, a vinyl cyan-based monomer and a maleimide-based monomer, and having a refractive index of 1.5170 or less and a glass transition temperature of 115.0° C. or more; and a second copolymer formed by graft-copolymerizing an aromatic vinyl-based monomer and a vinyl cyan-based monomer onto an acrylic rubber polymer, and the thermoplastic resin composition according to the present invention has improved heat resistance, colorability and scratch resistance.Type: GrantFiled: November 28, 2019Date of Patent: January 30, 2024Assignee: LG CHEM, LTD.Inventors: Jung Tae Park, Dae Woo Lee, Jae Bum Seo, Gyu Sun Kim, Ji Uk Jang
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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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Thermoplastic resin composition, method of preparing the same, and molded article including the same
Patent number: 11718745Abstract: A thermoplastic resin composition of the present invention includes 55 to 70% by weight of a non-grafted copolymer (A) containing 65 to 83% by weight of a (meth)acrylic acid alkyl ester compound, 2 to 12% by weight of an N-substituted maleimide compound, 1 to 6% by weight of a vinyl cyanide compound, and 7 to 17% by weight of an aromatic vinyl compound; 20 to 42% by weight of an acrylate-based rubber-aromatic vinyl compound-vinyl cyanide compound graft copolymer (B) containing acrylate-based rubber having an average particle diameter of 50 to 200 nm; and 1 to 15% by weight of an acrylate-based rubber-aromatic vinyl compound-vinyl cyanide compound graft copolymer (C) containing acrylate-based rubber having an average particle diameter of 300 to 600 nm. Within this range, a thermoplastic resin composition having excellent weather resistance, heat resistance, scratch resistance, and colorability.Type: GrantFiled: September 24, 2020Date of Patent: August 8, 2023Assignee: LG CHEM, LTD.Inventors: Gyu Sun Kim, Dae Woo Lee, Jae Bum Seo, Jung Tae Park, Seongjae Shin, Jiuk Jang -
Patent number: 11708443Abstract: Provided is a method of preparing a graft copolymer, which includes: preparing a liquid maleimide-based monomer; preparing a reaction solution including a diene-based rubber polymer, an aromatic vinyl-based monomer, and a vinyl cyan-based monomer; and adding the liquid maleimide-based monomer and the reaction solution to a reactor and carrying out polymerization. According to the preparation method of the present invention, the amount of the maleimide-based monomer involved in the polymerization can be increased, and the color characteristics, glass transition temperature, and softening temperature of the graft copolymer are improved.Type: GrantFiled: November 8, 2019Date of Patent: July 25, 2023Assignee: LG CHEM, LTD.Inventors: Ji Uk Jang, Dae Woo Lee, Jae Bum Seo, Jung Tae Park, Gyu Sun Kim
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Patent number: 11655361Abstract: Provided is a thermoplastic resin composition which includes: a first copolymer including an acrylic graft copolymer; a second copolymer including an alkyl-substituted styrene-based monomer unit, a vinyl cyanide-based monomer unit, and a (meth)acrylate-based monomer unit; and a third copolymer including an alkyl-unsubstituted styrene-based monomer unit, a vinyl cyanide-based monomer unit, and a (meth)acrylate-based monomer unit. According to the present invention, a thermoplastic resin composition and a thermoplastic resin molded article, which are excellent in heat resistance, colorability, and scratch resistance, can be provided.Type: GrantFiled: February 10, 2020Date of Patent: May 23, 2023Assignee: LG CHEM, LTD.Inventors: Joon Hwi Jo, Seong Lyong Kim, Tae Hoon Kim, Dae Woo Lee, Jae Bum Seo
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Patent number: 11608401Abstract: Provided is a thermoplastic resin composition which includes: a first graft copolymer including a C4 to C10 alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit, and a vinyl cyan-based monomer unit; a second graft copolymer including a C4 to C10 alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit, and a vinyl cyan-based monomer unit; and a first styrene-based copolymer being a copolymer of a monomer mixture including a C1 to C3 alkyl-substituted styrene-based monomer, a vinyl cyan-based monomer, and a C1 to C3 alkyl (meth)acrylate-based monomer, wherein the first graft copolymer and the second graft copolymer have cores having mutually different average particle diameters. The thermoplastic resin composition is excellent in colorability, weather resistance, tensile strength, flexural strength, and impact strength.Type: GrantFiled: October 29, 2019Date of Patent: March 21, 2023Assignee: LG CHEM, LTD.Inventors: Joon Hwi Jo, Seong Lyong Kim, Dae Woo Lee, Jae Bum Seo
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Publication number: 20230057580Abstract: The present disclosure relates to a styrene copolymer, a thermoplastic resin composition, and methods of preparing the styrene copolymer and the thermoplastic resin composition. More particularly, the present disclosure relates to a styrene copolymer having a low residual oligomer content and excellent transparency due to uniform polymerization of components to be added; and a thermoplastic resin composition including the styrene copolymer and an acrylic rubber graft copolymer and being suitable for a molded article having excellent heat resistance, scratch resistance, and surface appearance.Type: ApplicationFiled: July 9, 2021Publication date: February 23, 2023Applicant: LG CHEM, LTD.Inventors: Mincheol JU, Hyung Sub LEE, Dae Woo LEE, Jae Bum SEO, Minseung SHIN, Sungwon HONG, Insoo KIM
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Publication number: 20220213247Abstract: Disclosed is a method for producing a diene-based graft copolymer resin, and a diene-based graft copolymer resin produced therefrom, the method including: adding, into a reactor, a polymerization solution containing a diene-based rubber polymer, an aromatic vinyl-based monomer, a vinyl cyan-based monomer, a polymerization initiator, and a reaction solvent, and polymerizing the polymerization solution to prepare a polymer; recovering a solution containing unreacted monomers and a reaction solvent from the polymerization solution, dispersing a releasing agent in the recovered solution, and then adding the solution into the front end of a volatilization tank; and removing the unreacted monomers and the reaction solvent from the volatilization tank.Type: ApplicationFiled: October 7, 2020Publication date: July 7, 2022Applicant: LG CHEM, LTD.Inventors: Ji Uk JANG, Dae Woo LEE, Jae Bum SEO, Jung Tae PARK, Gyu Sun KIM
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Patent number: 11332568Abstract: Provided are a method for preparing a graft copolymer and a graft copolymer prepared thereby, the method comprising: preparing a reaction solution comprising a copolymer comprising a unit derived from a diene-based monomer and a unit derived from an alkene-based monomer, an aromatic vinyl-based monomer, a vinyl cyan-based monomer, and a reaction solvent; and adding the reaction solution to perform primary bulk polymerization at 100 to 110° C., wherein the copolymer comprises the unit derived from a diene-based monomer in an amount of 5 to 10 wt %, and the graft copolymer has an average rubber particle size of 2 to 5?m.Type: GrantFiled: October 26, 2018Date of Patent: May 17, 2022Assignee: LG CHEM, LTD.Inventors: Jae Bum Seo, Dae Woo Lee, Jung Tae Park, Gyu Sun Kim, Ji Uk Jang
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Publication number: 20220135725Abstract: The present invention relates to a method for producing a diene-based graft copolymer resin, and a diene-based graft copolymer resin produced therefrom, the method including: mixing an aromatic vinyl-based monomer, a diene-based rubber polymer, and a polymerization initiator to prepare a first reactant; mixing a vinyl cyan-based monomer and an antioxidant to prepare a second reactant; adding and polymerizing the first reactant and the second reactant into a polymerization reactor to prepare a polymer; and removing unreacted monomers in a devolatilization tank.Type: ApplicationFiled: October 6, 2020Publication date: May 5, 2022Inventors: Jae Bum SEO, Dae Woo LEE, Jung Tae PARK, Gyu Sun KIM, Ji Uk JANG
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THERMOPLASTIC RESIN COMPOSITION, METHOD OF PREPARING THE SAME, AND MOLDED ARTICLE INCLUDING THE SAME
Publication number: 20220089854Abstract: A thermoplastic resin composition of the present invention includes 65 to 85% by weight of a heat-resistant copolymer (A) containing 76 to 92% by weight of a (meth)acrylic acid alkyl ester compound, 1 to 8% by weight of an N-substituted maleimide compound, and 5 to 16% by weight of an aromatic vinyl compound; 10 to 30% by weight of an acrylate-based rubber-aromatic vinyl compound-vinyl cyanide compound graft copolymer (B) containing acrylate-based rubber having an average particle diameter of 50 to 200 nm; and 1 to 15% by weight of an acrylate-based rubber-aromatic vinyl compound-vinyl cyanide compound graft copolymer (C) containing acrylate-based rubber having an average particle diameter of 300 to 600 nm. In this case, in the heat-resistant copolymer (A), the weight ratio of the aromatic vinyl compound to the N-substituted maleimide compound is 1.5 to 8.Type: ApplicationFiled: September 24, 2020Publication date: March 24, 2022Inventors: Jung Tae PARK, Dae Woo LEE, Jae Bum SEO, Gyu Sun KIM, Jiuk JANG -
THERMOPLASTIC RESIN COMPOSITION, METHOD OF PREPARING THE SAME, AND MOLDED ARTICLE INCLUDING THE SAME
Publication number: 20220073724Abstract: A thermoplastic resin composition of the present invention includes 55 to 70% by weight of a non-grafted copolymer (A) containing 65 to 83% by weight of a (meth)acrylic acid alkyl ester compound, 2 to 12% by weight of an N-substituted maleimide compound, 1 to 6% by weight of a vinyl cyanide compound, and 7 to 17% by weight of an aromatic vinyl compound; 20 to 42% by weight of an acrylate-based rubber-aromatic vinyl compound-vinyl cyanide compound graft copolymer (B) containing acrylate-based rubber having an average particle diameter of 50 to 200 nm; and 1 to 15% by weight of an acrylate-based rubber-aromatic vinyl compound-vinyl cyanide compound graft copolymer (C) containing acrylate-based rubber having an average particle diameter of 300 to 600 nm. Within this range, a thermoplastic resin composition having excellent weather resistance, heat resistance, scratch resistance, and colorability.Type: ApplicationFiled: September 24, 2020Publication date: March 10, 2022Inventors: Gyu Sun KIM, Dae Woo LEE, Jae Bum SEO, Jung Tae PARK, Seongjae SHIN, Jiuk JANG -
Patent number: 11180590Abstract: The present invention relates to a copolymer including 20 to 65 wt % of units derived from an alkyl styrene-based monomer; 10 to 40 wt % of units derived from a (meth)acrylate-based monomer; and 20 to 40 wt % of units derived from vinyl cyan-based monomer, based on the total weight of the copolymer, wherein the residual monomer content is 780 ppm or less, and a method for preparing the same.Type: GrantFiled: July 26, 2018Date of Patent: November 23, 2021Assignee: LG CHEM, LTD.Inventors: Jae Bum Seo, Dae Woo Lee, Jung Tae Park, Gyu Sun Kim, Ji Uk Jang
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Publication number: 20210230333Abstract: Provided is a thermoplastic resin composition which includes: a first graft copolymer including a C4 to C10 alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit, and a vinyl cyan-based monomer unit; a second graft copolymer including a C4 to C10 alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit, and a vinyl cyan-based monomer unit; and a first styrene-based copolymer being a copolymer of a monomer mixture including a C1 to C3 alkyl-substituted styrene-based monomer, a vinyl cyan-based monomer, and a C1 to C3 alkyl (meth)acrylate-based monomer, wherein the first graft copolymer and the second graft copolymer have cores having mutually different average particle diameters. The thermoplastic resin composition is excellent in colorability, weather resistance, tensile strength, flexural strength, and impact strength.Type: ApplicationFiled: October 29, 2019Publication date: July 29, 2021Inventors: Joon Hwi JO, Seong Lyong KIM, Dae Woo LEE, Jae Bum SEO
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Publication number: 20210221996Abstract: Provided is a thermoplastic resin composition which includes: a first copolymer including an acrylic graft copolymer; a second copolymer including an alkyl-substituted styrene-based monomer unit, a vinyl cyanide-based monomer unit, and a (meth)acrylate-based monomer unit; and a third copolymer including an alkyl-unsubstituted styrene-based monomer unit, a vinyl cyanide-based monomer unit, and a (meth)acrylate-based monomer unit. According to the present invention, a thermoplastic resin composition and a thermoplastic resin molded article, which are excellent in heat resistance, colorability, and scratch resistance, can be provided.Type: ApplicationFiled: February 10, 2020Publication date: July 22, 2021Applicant: LG Chem, Ltd.Inventors: Joon Hwi JO, Seong Lyong KIM, Tae Hoon KIM, Dae Woo LEE, Jae Bum SEO
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Publication number: 20210206958Abstract: The present invention relates to a thermoplastic resin composition, which includes a first copolymer formed by polymerizing a monomer mixture of a (meth)acrylate-based monomer, a vinyl cyan-based monomer and a maleimide-based monomer, and having a refractive index of 1.5170 or less and a glass transition temperature of 115.0° C. or more; and a second copolymer formed by graft-copolymerizing an aromatic vinyl-based monomer and a vinyl cyan-based monomer onto an acrylic rubber polymer, and the thermoplastic resin composition according to the present invention has improved heat resistance, colorability and scratch resistance.Type: ApplicationFiled: November 28, 2019Publication date: July 8, 2021Inventors: Jung Tae PARK, Dae Woo LEE, Jae Bum SEO, Gyu Sun KIM, Ji Uk JANG
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Publication number: 20210163652Abstract: Provided is a method of preparing a graft copolymer, which includes: preparing a liquid maleimide-based monomer; preparing a reaction solution including a diene-based rubber polymer, an aromatic vinyl-based monomer, and a vinyl cyan-based monomer; and adding the liquid maleimide-based monomer and the reaction solution to a reactor and carrying out polymerization. According to the preparation method of the present invention, the amount of the maleimide-based monomer involved in the polymerization can be increased, and the color characteristics, glass transition temperature, and softening temperature of the graft copolymer are improved.Type: ApplicationFiled: November 8, 2019Publication date: June 3, 2021Inventors: Ji Uk JANG, Dae Woo LEE, Jae Bum SEO, Jung Tae PARK, Gyu Sun KIM
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Patent number: 10717859Abstract: The present invention relates to a composition for preparing a SAN copolymer, a SAN copolymer, a preparation method therefor, a heat-resistant ABS resin blend comprising the same, and heat-resistant ABS pellets. Specifically, the present invention provides a composition for preparing a SAN copolymer, the composition comprising a monomer mixture, and ethylene glycol dimethacrylate as a chain extender, wherein the monomer mixture comprises 60 to 75 wt % of an ?-methylstyrene monomer and 25 to 40 wt % of an acrylonitrile-based monomer based on the total weight of the monomer mixture; and the ethylene glycol dimethacrylate is contained in an amount of 0.001 to 0.15 parts by weight based on 100 parts by weight of the monomer mixture.Type: GrantFiled: November 16, 2017Date of Patent: July 21, 2020Assignee: LG CHEM, LTD.Inventors: Gyu Sun Kim, Chang Hun Han, Dae Woo Lee, Jae Bum Seo, Jung Tae Park, Eun Jung Choi, Byoung Il Kang, Da Eun Sung
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Patent number: 10696766Abstract: The present invention provides a styrene-acrylonitrile (SAN) resin that exhibits significantly improved thermal resistance and, at the same time, can be produced at high productivity and is highly processable and highly moldable; and a method of producing the same by preparing and storing the solution containing a mixture of an N-substituted maleimide monomer and an unsaturated nitrile monomer at a particular temperature, introducing the solution and a styrene polymer into the polymerization reactor separately, and maintaining the first polymerization reactor and the second polymerization reactor at particular respective temperatures, thereby significantly reducing the amounts of oligomers contained in the SAN resin.Type: GrantFiled: September 6, 2017Date of Patent: June 30, 2020Assignee: LG CHEM, LTD.Inventors: Jae Bum Seo, Dae Woo Lee, Jung Tae Park, Gyu Sun Kim, Chang Hun Han