Patents by Inventor Sang Hoo Park
Sang Hoo Park 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: 11898029Abstract: Provided is a thermoplastic resin composition which includes: a base resin including, in a weight ratio of 70:30 to 90:10, a first copolymer formed by graft polymerization of a diene-based rubber polymer having an average particle diameter of 50 to 200 nm with a first monomer mixture including an alkyl(meth)acrylate-based monomer and an aromatic vinyl-based monomer and a second copolymer which is a copolymer of a second monomer mixture including an alkyl(meth)acrylate-based monomer and an aromatic vinyl-based monomer; and a plasticizer.Type: GrantFiled: June 4, 2020Date of Patent: February 13, 2024Assignee: LG CHEM, LTD.Inventors: Roo Da Lee, Jeong Su Choi, Won Seok Lee, Sang Hoo Park, Jong Ju Lee
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Publication number: 20230399503Abstract: The present disclosure relates to a thermoplastic resin composition which includes: a graft polymer including a rubber polymer having a gel content of 0 to 10 wt % and including an aromatic vinyl-based monomer unit and a diene-based monomer unit; and a shell including a (meth)acrylate-based monomer unit and an aromatic vinyl-based monomer unit which are grafted to the rubber polymer; and a non-grafted polymer including 90 wt % or more of a (meth)acrylate-based monomer unit.Type: ApplicationFiled: July 19, 2022Publication date: December 14, 2023Applicant: LG CHEM, LTD.Inventors: Jeong Su CHOI, Won Seok LEE, Roo Da LEE, Sang Hoo PARK, Jong Ju LEE
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Publication number: 20230391999Abstract: The present disclosure relates to thermoplastic resin composition including: a graft polymer comprising a diene-based rubber polymer onto which a (meth)acrylate-based monomer unit and a vinyl aromatic monomer unit are grafted; a non-grafted polymer comprising a (meth)acrylate-based monomer unit and a vinyl aromatic monomer unit; and 3 to 30% by weight of waste artificial marble.Type: ApplicationFiled: May 2, 2022Publication date: December 7, 2023Applicant: LG CHEM, LTD.Inventors: Sang Hoo PARK, Jeong Su CHOI, Won Seok LEE, Roo Da LEE, Yeo Ju KIM, Jong Ju LEE
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Publication number: 20230383041Abstract: The present disclosure relates to a thermoplastic resin composition which includes: a graft polymer including a rubber polymer having a gel content of 0 to 10 wt % and including an aromatic vinyl-based monomer unit and a diene-based monomer unit; and a shell including a (meth)acrylate-based monomer unit and an aromatic vinyl-based monomer unit which are grafted to the rubber polymer; and a non-grafted polymer including a (meth)acrylate-based monomer unit and an aromatic vinyl-based monomer unit, wherein the refractive indices of the graft polymer and the non-grafted polymer differ by 0.0100 or less.Type: ApplicationFiled: July 19, 2022Publication date: November 30, 2023Applicant: LG CHEM, LTD.Inventors: Jeong Su CHOI, Won Seok LEE, Roo Da LEE, Sang Hoo PARK, Jong Ju LEE
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Publication number: 20220340701Abstract: Provided is a thermoplastic resin composition which includes: a rubber polymer including a first styrene-based monomer unit and a diene-based monomer unit in a weight ratio of 10:90 to 35:65 and having an average particle diameter of 250 to 450 nm; a (meth)acrylate-based monomer unit; and a second styrene-based monomer unit, wherein a weight ratio of the (meth)acrylate-based monomer unit to the second styrene-based monomer unit is 2 or less, and a weight-average molecular weight ranges from 130,000 to 250,000 g/mol.Type: ApplicationFiled: March 31, 2021Publication date: October 27, 2022Applicant: LG CHEM, LTD.Inventors: Jeong Su Choi, Won Seok Lee, Roo Da Lee, Sang Hoo Park, Jong Ju Lee, Seung Je Oh
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Patent number: 11434358Abstract: The present invention relates to a matrix copolymer including a cellulose nanocrystal derivative, an alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit, and a vinyl cyan-based monomer unit; a graft copolymer including a cellulose nanocrystal derivative, a conjugated diene-based polymer, an alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit, and a vinyl cyan-based monomer unit; and a thermoplastic resin composition including at least one thereof. In accordance with the present invention, provided is a thermoplastic resin composition having improved processability, impact strength, tensile strength and chemical resistance while maintaining transparency.Type: GrantFiled: May 14, 2019Date of Patent: September 6, 2022Assignee: LG CHEM, LTD.Inventors: Hye Jeong Ok, Seok Goo Jang, Sang Hoo Park, Hyung Seop Shim, Jeong Su Choi, Keun Hoon Yoo, Won Seok Lee, Roo Da Lee, Ho Hoon Kim, Jong Ju Lee
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Patent number: 11421103Abstract: The present invention relates to a method for preparing a graft copolymer powder, which includes: performing emulsion polymerization of a conjugated diene polymer, an aromatic vinyl monomer and an alkyl (meth)acrylate monomer to prepare a graft copolymer latex; coagulating the graft copolymer latex; aging the coagulated graft copolymer; preparing a wet powder of the graft copolymer by dehydrating the aged graft copolymer; and adding poly(oxyalkylene)diglycolic acid to the wet powder of the graft copolymer.Type: GrantFiled: November 9, 2018Date of Patent: August 23, 2022Assignee: LG CHEM, LTDInventors: Jong Ju Lee, Jeong Su Choi, Won Seok Lee, Roo Da Lee, Ho Hoon Kim, Keun Hoon Yoo, Seok Goo Jang, Sang Hoo Park, Hye Jeong Ok, Hyung Seop Shim
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Publication number: 20220185933Abstract: Provided is a method of preparing a graft polymer, which includes: adding a diene-based rubber polymer, a first monomer mixture including a (meth)acrylate-based monomer and an aromatic vinyl-based monomer, and a reactive ultraviolet (UV) stabilizer to a reactor and carrying out polymerization to prepare a composite rubber polymer; and graft-polymerizing a second monomer mixture including a (meth)acrylate-based monomer, an aromatic vinyl-based monomer, and a vinyl cyanide-based monomer to the composite rubber polymer to prepare a graft polymer, wherein the reactive UV stabilizer is added in an amount of 0.1 to 2 parts by weight based on 100 parts by weight of the sum of the diene-based rubber polymer, the first monomer mixture, and the second monomer mixture.Type: ApplicationFiled: September 2, 2020Publication date: June 16, 2022Inventors: Jeong Su CHOI, Won Seok LEE, Roo Da LEE, Sang Hoo PARK, Jong Ju LEE
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Patent number: 11312852Abstract: The present invention relates to a method for preparing a graft copolymer complex, a copolymer complex prepared by the method, and a thermoplastic resin composition comprising the copolymer complex, wherein the method comprises emulsion-polymerizing a conjugated diene-based polymer, an aromatic vinyl-based monomer, and an alkyl (meth)acrylate-based monomer to prepare a graft copolymer latex; and adding an imidazole-based ionic compound to the graft copolymer latex and coagulating the same.Type: GrantFiled: October 2, 2018Date of Patent: April 26, 2022Assignee: LG CHEM, LTD.Inventors: Sang Hoo Park, Seok Goo Jang, Hye Jeong Ok, Ho Hoon Kim, Hyung Seop Shim, Jeong Su Choi, Keun Hoon Yoo, Won Seok Lee, Roo Da Lee, Jong Ju Lee
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Patent number: 11267964Abstract: The present invention relates to a thermoplastic resin composition showing excellent transparency and whitening resistance. The thermoplastic resin composition of the present invention comprises (A) a graft copolymer having a multilayer structure and (B) a thermoplastic copolymer, wherein the graft copolymer having a multilayer structure (A) comprises a core of a conjugated diene-based rubber latex having a weight average particle diameter of 500 ? to 2,000 ?; an intermediate layer; and a graft layer. The glass transition temperature of the intermediate layer is 40° C. or less, the glass transition temperature of the graft layer is 80° C. or more, and the refractive index difference between the graft copolymer (A) and the thermoplastic copolymer (B) is less than 0.01.Type: GrantFiled: September 20, 2018Date of Patent: March 8, 2022Assignee: LG CHEM, LTD.Inventors: Jeong Su Choi, Won Seok Lee, Roo Da Lee, Jong Ju Lee, Keun Hoon Yoo, Seok Goo Jang, Sang Hoo Park, Hye Jeong Ok, Ho Hoon Kim, Hyung Seop Shim
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Publication number: 20210355313Abstract: Provided is a thermoplastic resin composition which includes: a base resin including, in a weight ratio of 70:30 to 90:10, a first copolymer formed by graft polymerization of a diene-based rubber polymer having an average particle diameter of 50 to 200 nm with a first monomer mixture including an alkyl(meth)acrylate-based monomer and an aromatic vinyl-based monomer and a second copolymer which is a copolymer of a second monomer mixture including an alkyl(meth)acrylate-based monomer and an aromatic vinyl-based monomer; and a plasticizer.Type: ApplicationFiled: June 4, 2020Publication date: November 18, 2021Inventors: Roo Da LEE, Jeong Su CHOI, Won Seok LEE, Sang Hoo PARK, Jong Ju LEE
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Publication number: 20210292538Abstract: The present invention relates to a method for preparing a graft copolymer powder, which includes: performing emulsion polymerization of a conjugated diene polymer, an aromatic vinyl monomer and an alkyl (meth)acrylate monomer to prepare a graft copolymer latex; coagulating the graft copolymer latex; aging the coagulated graft copolymer; preparing a wet powder of the graft copolymer by dehydrating the aged graft copolymer; and adding poly(oxyalkylene)diglycolic acid to the wet powder of the graft copolymer.Type: ApplicationFiled: November 9, 2018Publication date: September 23, 2021Inventors: Jong Ju LEE, Jeong Su CHOI, Won Seok LEE, Roo Da LEE, Ho Hoon KIM, Keun Hoon YOO, Seok Goo JANG, Sang Hoo PARK, Hye Jeong OK, Hyung Seop SHIM
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Patent number: 10941289Abstract: A graft copolymer, a thermoplastic resin composition including the graft copolymer, and a method of preparing the thermoplastic resin composition are described herein. A graft copolymer having a shell in which silica modified with a specific compound is dispersed within a specific content range, a thermoplastic resin composition including the graft copolymer, and a method of preparing the thermoplastic resin composition are also described herein. Since silica modified with a specific compound is dispersed in the periphery of rubber particles, that is, in the shell of the graft copolymer, the dispersibility of the graft copolymer may be improved. Therefore, the graft copolymer may have transparency equal to or better than a conventional graft copolymer. In addition, compared to a resin composition having an equivalent rubber content, the thermoplastic resin composition described herein may have excellent physical properties, such as impact strength and tensile strength.Type: GrantFiled: September 4, 2018Date of Patent: March 9, 2021Assignee: LG Chem, LTD.Inventors: Hyung Seop Shim, Won Seok Lee, Seok Goo Jang, Sang Hoo Park, Hye Jeong Ok, Jeong Su Choi, Keun Hoon Yoo, Roo Da Lee, Ho Hoon Kim, Jong Ju Lee
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Publication number: 20200270442Abstract: The present invention relates to a matrix copolymer including a cellulose nanocrystal derivative, an alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit, and a vinyl cyan-based monomer unit; a graft copolymer including a cellulose nanocrystal derivative, a conjugated diene-based polymer, an alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit, and a vinyl cyan-based monomer unit; and a thermoplastic resin composition including at least one thereof. In accordance with the present invention, provided is a thermoplastic resin composition having improved processability, impact strength, tensile strength and chemical resistance while maintaining transparency.Type: ApplicationFiled: May 14, 2019Publication date: August 27, 2020Inventors: Hye Jeong OK, Seok Goo JANG, Sang Hoo PARK, Hyung Seop SHIM, Jeong Su CHOI, Keun Hoon YOO, Won Seok LEE, Roo Da LEE, Ho Hoon KIM, Jong Ju LEE
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Patent number: 10703896Abstract: The present disclosure relates to a transparent thermoplastic resin and a method of preparing the same. More particularly, the present disclosure provides a transparent thermoplastic resin that provides superior transparency without generation of flow marks on a surface, and does not exhibit cracks or a whitening phenomenon during processing due to superior whitening resistance, particularly superior whitening resistance at low temperature, a method of preparing the transparent thermoplastic resin, and the like.Type: GrantFiled: August 30, 2017Date of Patent: July 7, 2020Assignee: LG CHEM, LTD.Inventors: Jeong Su Choi, Won Seok Lee, Seok Goo Jang, Roo Da Lee, Sang Hoo Park, Ho Hoon Kim, Hyung Seop Shim, Keun Hoon Yoo, Hye Jeong Ok
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Patent number: 10689473Abstract: The present invention relates to a graft copolymer having excellent thermal stability, a method of preparing the graft copolymer, a thermoplastic resin composition including the graft copolymer, and a molded part including the thermoplastic resin composition. According to the present invention, since the thermoplastic resin composition of the present invention includes the graft copolymer having excellent thermal stability, the thermoplastic resin composition and the molded part manufactured using the thermoplastic resin composition have excellent physical properties, such as impact strength, fluidity, and transparency. Furthermore, the degree of discoloration that may occur when the resin composition or the molded part is allowed to stay in an injection molding machine or stay at a high temperature for a long period of time may be reduced.Type: GrantFiled: January 2, 2018Date of Patent: June 23, 2020Assignee: LG CHEM, LTD.Inventors: Seok Goo Jang, Jeong Su Choi, Won Seok Lee, Roo Da Lee, Sang Hoo Park, Hye Jeong Ok, Ho Hoon Kim, Hyung Seop Shim, Keun Hoon Yoo
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Publication number: 20200140672Abstract: The present invention relates to a thermoplastic resin composition showing excellent transparency and whitening resistance. The thermoplastic resin composition of the present invention comprises (A) a graft copolymer having a multilayer structure and (B) a thermoplastic copolymer, wherein the graft copolymer having a multilayer structure (A) comprises a core of a conjugated diene-based rubber latex having a weight average particle diameter of 500 ? to 2,000 ?; an intermediate layer; and a graft layer. The glass transition temperature of the intermediate layer is 40° C. or less, the glass transition temperature of the graft layer is 80° C. or more, and the refractive index difference between the graft copolymer (A) and the thermoplastic copolymer (B) is less than 0.01.Type: ApplicationFiled: September 20, 2018Publication date: May 7, 2020Inventors: Jeong Su CHOI, Won Seok LEE, Roo Da LEE, Jong Ju LEE, Keun Hoon YOO, Seok Goo JANG, Sang Hoo PARK, Hye Jeong OK, Ho Hoon KIM, Hyung Seop SHIM
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Patent number: 10626227Abstract: Disclosed are a method of preparing a resin powder and an integrated reactor for the same. When a coagulation process is performed using an acidic coagulant in the integrated coagulator for latex coagulation and aging according to the present invention, a remaining acidic coagulant is also removed from a reactor through neutralization, and thus, a resin powder having enhanced moist-heat resistance and thermal stability may be prepared.Type: GrantFiled: August 31, 2015Date of Patent: April 21, 2020Assignee: LG CHEM, LTD.Inventors: Min Cheol Ju, Min Seung Shin, Won Seok Lee, Hyung Sub Lee, Seok Goo Jang, Jeong Su Choi, Sung Won Hong, In Soo Kim, Ho Hoon Kim, Sang Hoo Park, Keun Hoon Yoo, Roo Da Lee
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Publication number: 20190382575Abstract: The present invention relates to a method for preparing a graft copolymer complex, a copolymer complex prepared by the method, and a thermoplastic resin composition comprising the copolymer complex, wherein the method comprises emulsion-polymerizing a conjugated diene-based polymer, an aromatic vinyl-based monomer, and an alkyl (meth)acrylate-based monomer to prepare a graft copolymer latex; and adding an imidazole-based ionic compound to the graft copolymer latex and coagulating the same.Type: ApplicationFiled: October 2, 2018Publication date: December 19, 2019Inventors: Sang Hoo PARK, Seok Goo JANG, Hye Jeong OK, Ho Hoon KIM, Hyung Seop SHIM, Jeong Su CHOI, Keun Hoon YOO, Won Seok LEE, Roo Da LEE, Jong Ju LEE
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Publication number: 20190330463Abstract: The present invention relates to a graft copolymer, a thermoplastic resin composition including the graft copolymer, and a method of preparing the thermoplastic resin composition. More specifically, the present invention provides a graft copolymer having a shell in which silica modified with a specific compound is dispersed within a specific content range, a thermoplastic resin composition including the graft copolymer, and a method of preparing the thermoplastic resin composition. In the graft copolymer according to the present invention, since silica modified with a specific compound is dispersed in the periphery of rubber particles, that is, in the shell of the graft copolymer, the dispersibility of the graft copolymer may be improved. Therefore, the graft copolymer may have transparency equal to or better than a conventional graft copolymer.Type: ApplicationFiled: September 4, 2018Publication date: October 31, 2019Inventors: Hyung Seop SHIM, Won Seok LEE, Seok Goo JANG, Sang Hoo PARK, Hye Jeong OK, Jeong Su CHOI, Keun Hoon YOO, Roo Da LEE, Ho Hoon KIM, Jong Ju LEE