Patents by Inventor Dae Woo Nam
Dae Woo Nam 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: 10662296Abstract: The present disclosure relates to a preparation method of super absorbent polymer granules and super absorbent polymer granules prepared according to the same. More specifically, the preparation method of the present disclosure includes the steps of: forming a hydrogel polymer by carrying out a thermal polymerization or a photopolymerization of a monomer composition including a water-soluble ethylene-based unsaturated monomer and a polymerization initiator; drying and pulverizing the hydrogel polymer; classifying the pulverized polymer into a first fine powder having a particle size of 150 ?m or less, and a base resin having a particle size of 150 ?m or more and 850 ?m or less; surface-crosslinking the base resin; classifying the surface crosslinked base resin to separate a second fine powder having a particle size of 150 ?m or less; and forming fine powder granules by mixing the first fine powder, the second fine powder, and silica in a wet state.Type: GrantFiled: September 27, 2016Date of Patent: May 26, 2020Assignee: LG Chem, Ltd.Inventors: Dae Woo Nam, Kyung Moo Lee, Jae Hong Lee, Chang Sun Han
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Publication number: 20200139344Abstract: The present disclosure relates to a super absorbent polymer exhibiting improved rewetting property and excellent absorption property, and a preparation method of the same. This preparation method of a super absorbent polymer includes the steps of: preparing a base resin in which an acrylic acid-based monomer having at least partially neutralized acidic groups and an internal cross-linking agent are cross-linked and polymerized; and heating the base resin in the presence of a surface cross-linking agent to carry out surface modification, wherein the internal cross-linking agent includes a poly(meth)acrylate of polyols-based first internal cross-linking agent and a polyglycidyl ether of polyols-based second internal cross-linking agent in a specific weight ratio.Type: ApplicationFiled: September 4, 2018Publication date: May 7, 2020Applicant: LG Chem, Ltd.Inventors: Su Jin Kim, Dae Woo Nam, Ki Hyun Kim, Joonil Cho
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Publication number: 20200122119Abstract: The super absorbent polymer according to the present invention has reduced 3-hour saline solution re-wet while having a high absorption rate and absorption against pulp, and thus can be used for hygienic materials such as diapers, thereby exhibiting excellent performance.Type: ApplicationFiled: December 28, 2016Publication date: April 23, 2020Applicant: LG Chem, Ltd.Inventors: Ji Yoon Jeong, Jun Kyu Kim, Dae Woo Nam, Tae Hwan Jang, Bo Hyun Seong, Yeon Woo Hong, Su Jin Kim, Seong Beom Heo, Seon Jung Jung, Hyung Ki Yoon
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Publication number: 20200010624Abstract: A super absorbent polymer according to the present invention has excellent dryness while maintaining excellent absorption performance, and thus is preferably used for hygienic materials such as diapers, and can exhibit excellent performance.Type: ApplicationFiled: December 28, 2016Publication date: January 9, 2020Applicant: LG Chem, Ltd.Inventors: Dae Woo Nam, Jun Kyu Kim, Hyung Ki Yoon, Tae Hwan Jang, Bo Hyun Seong, Yeon Woo Hong, Su Jin Kim, Seong Beom Heo, Seon Jung Jung, Ji Yoon Jeong
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Publication number: 20190308171Abstract: The present invention relates to a superabsorbent polymer which exhibits more improved liquid permeability while maintaining excellent absorption performance, and suppresses aggregation and caking of particles even under high temperature/high humidity conditions, and to a method for producing the same. The super absorbent polymer comprises: a base polymer powder including a first crosslinked polymer of a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups; and a surface crosslinked layer formed on the base polymer powder and including a second cross-linked polymer in which the first cross-linked polymer is further crosslinked via a surface cross-linking agent, wherein the super absorbent polymer includes aluminum sulfate dispersed in the surface crosslinked layer and alumina dispersed on the surface crosslinked layer.Type: ApplicationFiled: October 27, 2017Publication date: October 10, 2019Applicant: LG Chem, Ltd.Inventors: Su Jin Kim, Dae Woo Nam, Tae Hwan Jang, Jun Kyu Kim, Bo Hyun Seong, Seon Jung Jung, Ji Yoon Jeong
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Publication number: 20190248963Abstract: Provided are a superabsorbent polymer and a preparation method thereof. According to the present invention, a superabsorbent polymer having high centrifuge retention capacity and absorption rate may be prepared by using a specific foam stabilizer.Type: ApplicationFiled: November 22, 2017Publication date: August 15, 2019Applicant: LG Chem, Ltd.Inventors: Hyung Ki Yoon, Yeon Woo Hong, Seong Beom Heo, Dae Woo Nam, Tae Hwan Jang, Jun Kyu Kim, Bo Hyun Seong, Su Jin Kim, Seon Jung Jung, Ji Yoon Jeong
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Publication number: 20190217272Abstract: A superabsorbent polymer having high centrifuge retention capacity and absorption rate prepared by using a particular foam stabilizer and a polymerization initiator. The foam stabilizer includes a sucrose ester and a polyalkylene oxide, and polymerization initiator includes a photoinitiator and a cationic azo-based initiator.Type: ApplicationFiled: February 2, 2018Publication date: July 18, 2019Applicant: LG Chem, Ltd.Inventors: Yeon Woo HONG, Seong Beom HEO, Hyung Ki YOON, Dae Woo NAM, Tae Hwan JANG, Jun Kyu KIM, Bo Hyun SEONG, Su Jin KIM, Seon Jung JUNG, Ji Yoon JEONG
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Publication number: 20190134603Abstract: A superabsorbent polymer according to the present invention has excellent initial absorption properties, and thus it may be used in sanitary materials such as diapers, etc., thereby exhibiting excellent performances.Type: ApplicationFiled: January 5, 2017Publication date: May 9, 2019Applicant: LG Chem, Ltd.Inventors: Jun Kyu KIM, Hyung Ki YOON, Dae Woo NAM, Bo Hyun SEONG, Yeon Woo HONG, Seong Beom HEO, Seon Jung JUNG, Ji Yoon JEONG, Tae Hwan JANG, Su Jin KIM
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Publication number: 20190135992Abstract: A super absorbent polymer produced by the preparation method of the super absorbent polymer according to the present invention has excellent dryness while maintaining excellent absorption performance, and thus is preferably used for hygienic materials such as diapers and can exhibit excellent performance.Type: ApplicationFiled: December 28, 2016Publication date: May 9, 2019Applicant: LG Chem, Ltd.Inventors: Bo Hyun Seong, Dae Woo Nam, Jun Kyu Kim, Su Jin Kim, Seon Jung Jung, Ji Yoon Jeong, Tae Hwan Jang
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Publication number: 20190100629Abstract: A super absorbent polymer according to the present invention has an excellent discoloration resistance characteristic even under high temperature/high humidity conditions, while maintaining excellent absorption performance, and is preferably used for hygienic materials such as diapers, and thus can exhibit excellent performance.Type: ApplicationFiled: December 28, 2016Publication date: April 4, 2019Applicant: LG Chem, Ltd.Inventors: Dae Woo Nam, Seon Jung Jung, Tae Hwan Jang, Jun Kyu Kim, Seong Beom Heo, Bo Hyun Seong, Yeon Woo Hong, Su Jin Kim, Ji Yoon Jeong, Hyung Ki Yoon
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Publication number: 20180318793Abstract: The present invention relates to a method for preparing a super absorbent polymer exhibiting improved liquid permeability, gel strength, absorption rate and the like while maintaining excellent absorption performance. The method for preparing the super absorbent polymer comprises the steps of: carrying out a crosslinking polymerization of a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups in the presence of an internal crosslinking agent to form a hydrogel polymer including a cross-linked polymer; drying, pulverizing, and classifying the hydrogel polymer to form a base polymer powder; and surface-crosslinking the base polymer powder by using a surface crosslinking liquid containing a surface crosslinking agent of an alkylene carbonate having 2 to 5 carbon atoms, in the presence of hydrophobic silica particles having a water-contact angle of more than 10° and 150° or less and hydrophilic silica particles having a water-contact angle of 10° or less.Type: ApplicationFiled: January 3, 2017Publication date: November 8, 2018Applicant: LG Chem, Ltd.Inventors: Hyung Ki Yoon, Dae Woo Nam, Hyemin Lee, Chang Sun Han, Sung Jong Seo
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Publication number: 20180304232Abstract: The present invention relates to a super absorbent polymer exhibiting more improved liquid permeability and/or absorption rate while maintaining excellent absorption performance. Such super absorbent polymer comprises a base polymer powder including a first cross-linked polymer of a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups; and a surface cross-linked layer formed on the base polymer powder and including a second cross-linked polymer in which the first cross-linked polymer is further cross-linked through an alkylene carbonate having 2 to 5 carbon atoms, and satisfies predetermined physical properties.Type: ApplicationFiled: January 10, 2017Publication date: October 25, 2018Applicant: LG Chem, Ltd.Inventors: Dae Woo Nam, Chang Sun Han, Hyemin Lee, Hwayoon Jung, Hyung Ki Yoon
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Patent number: 10086362Abstract: The present invention relates to a manufacturing method of a super absorbent polymer including: carrying out a thermal polymerization or a photopolymerization of a monomer composition including a water-soluble ethylene-based unsaturated monomer and a polymerization initiator to form a hydrogel polymer; drying the hydrogel polymer; pulverizing the dried polymer; classifying the pulverized polymer into a fine powder having a particle diameter of less than 150 ?m and a polymer having a particle diameter of 150 to 850 ?m according to the particle diameter; performing reassembly to form a fine powder reassembly; and mixing the polymer having a particle diameter of 150 to 850 ?m with the fine powder reassembly, followed by surface cross-linking.Type: GrantFiled: November 1, 2016Date of Patent: October 2, 2018Assignee: LG Chem, Ltd.Inventors: Dong Hyun Kim, Chang Sun Han, Dae Woo Nam
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Publication number: 20180237593Abstract: The present disclosure relates to a preparation method of super absorbent polymer granules and super absorbent polymer granules prepared according to the same. More specifically, the preparation method of the present disclosure includes the steps of: forming a hydrogel polymer by carrying out a thermal polymerization or a photopolymerization of a monomer composition including a water-soluble ethylene-based unsaturated monomer and a polymerization initiator; drying and pulverizing the hydrogel polymer; classifying the pulverized polymer into a first fine powder having a particle size of 150 ?m or less, and a base resin having a particle size of 150 ?m or more and 850 ?m or less; surface-crosslinking the base resin; classifying the surface crosslinked base resin to separate a second fine powder having a particle size of 150 ?m or less; and forming fine powder granules by mixing the first fine powder, the second fine powder, and silica in a wet state.Type: ApplicationFiled: September 27, 2016Publication date: August 23, 2018Applicant: LG Chem, Ltd.Inventors: Dae Woo Nam, Kyung Moo Lee, Jae Hong Lee, Chang Sun Han
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Publication number: 20170354952Abstract: The present invention relates to a manufacturing method of a super absorbent polymer. The manufacturing method of a super absorbent polymer according to the present invention may include: carrying out a thermal polymerization or a photopolymerization of a monomer composition including a water-soluble ethylene-based unsaturated monomer and a polymerization initiator to form a hydrogel polymer; drying the hydrogel polymer; pulverizing the dried polymer; classifying the pulverized polymer into a fine powder having a particle diameter of less than 150 ?m and a polymer having a particle diameter of 150 to 850 ?m according to the particle diameter; performing reassembly by mixing and wetting the fine powder with 5 to 30° C.Type: ApplicationFiled: November 1, 2016Publication date: December 14, 2017Applicant: LG Chem, Ltd.Inventors: Dong Hyun Kim, Chang Sun Han, Dae Woo Nam
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Patent number: 9796822Abstract: The present invention relates to an optical film that comprises a block copolymer that comprises a vinyl polymer block containing styrene or a derivative thereof, and a poly-dimethylsiloxane block, a retardation film using the same, a method of manufacturing them, and a liquid crystal display comprising the films.Type: GrantFiled: April 14, 2008Date of Patent: October 24, 2017Assignee: LG CHEM, LTD.Inventors: Hee-Jung Kim, Dong-Ryul Kim, Young-Whan Park, Dae-Woo Nam, Boong-Goon Jeong
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Patent number: 9770848Abstract: The present invention relates to a method for manufacturing a low density inorganic powder insulator having a low density molded structure using expanded perlite without a binder and a mold machine for manufacturing the same, and more particularly, to a technology of uniformly dispersing perlite particles having a shape of irregular fragments of glass using expanded perlite to form a framework among synthetic silica to improve molding strength even at a low density, thereby reducing thermal conductivity (conduction and convection blocking) due to a low density and an increase in a specific surface area.Type: GrantFiled: August 7, 2013Date of Patent: September 26, 2017Assignee: KYUNGDONG ONE CORPORATIONInventors: Bum Gyu Baek, Dae Woo Nam
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Publication number: 20170113376Abstract: The present invention relates to a continuous manufacturing method for a vacuum insulation material, including: a first step of putting a porous insulation material into an inner envelope having permeability, three sides thereof being closed and one side thereof being open, and then sealing the inner envelope; a second step of flattening an upper broad side of the inner envelope; a third step of compressing the inner envelope flattened in the second step; a fourth step of sealing all sides of the inner envelope compressed in the third step, except for one side, with an outer envelope having a shielding property, and packaging the sealed inner envelope; and a fifth step of sealing the one side of the inner envelope not sealed in the third step by putting the inner envelope sealed in the fourth step into a vacuum chamber and performing a vacuum operation.Type: ApplicationFiled: June 4, 2015Publication date: April 27, 2017Inventors: Jong Hyun Yun, Dae Woo Nam, Soo Ok Hwang
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Patent number: 9624328Abstract: The present invention relates to a superabsorbent polymer which has excellent initial absorbency and keeps water from flowing out under pressure even after passage of time. The superabsorbent polymer of the present invention is characterized by simultaneously optimizing centrifuge retention capacity (CRC), absorbency under pressure (AUP), liquid permeability (SFC), and gel strength within a predetermined range. The present invention can provide improved physical properties of a final diaper product and apply an ultra-thin technology to the diaper product.Type: GrantFiled: April 28, 2014Date of Patent: April 18, 2017Assignee: LG Chem, Ltd.Inventors: Tae Young Won, Dae Woo Nam, Chang Sun Han
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Patent number: 9315639Abstract: The present invention relates to an optical film that includes a graft copolymer that includes two types or more of (meth)acryl based resins that have different glass transition temperatures, a retardation film, a method of producing the same, and a polarizing plate and a liquid crystal display device that include the optical film or the retardation film.Type: GrantFiled: June 12, 2008Date of Patent: April 19, 2016Assignee: LG CHEM, LTD.Inventors: Hee-Jung Kim, Dong-Ryul Kim, Boong-Goon Jeong, Ju-Eun Cha, Young-Whan Park, Dae-Woo Nam