Patents by Inventor Chul-Hee Ryu
Chul-Hee Ryu 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: 10889673Abstract: The present invention relates to a super absorbent polymer and a preparation method thereof, the super absorbent polymer including: surface cross-linked polymer particles prepared by surface cross-linking particles of a base resin, the base resin polymerized from a monomer composition including water-soluble ethylene-based unsaturated monomers having at least partially neutralized acidic groups; and a water-soluble component, wherein the water-soluble component has a weight average molecular weight of 150,000 to 300,000 g/mol. The super absorbent polymer may have high centrifuge retention capacity and excellent permeability at the same time, while having low content of the water-soluble component.Type: GrantFiled: October 12, 2018Date of Patent: January 12, 2021Inventors: Sang Gi Lee, Chul Hee Ryu, Kyu Pal Kim, Bhom Ri Kim
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Patent number: 10335768Abstract: The present invention relates to a super absorbent polymer which is excellent in various physical properties required for a super absorbent polymer, while exhibiting excellent water absorption capacity, absorption rate and liquid permeability, and a method for preparing the same.Type: GrantFiled: March 30, 2016Date of Patent: July 2, 2019Assignee: LG Chem, Ltd.Inventors: Tae Bin Ahn, Chang Sun Han, Seung Do Hong, Chul Hee Ryu, Dong Hyun Kim
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Publication number: 20190183682Abstract: The present invention relates to a super absorbent polymer. The super absorbent polymer according to the present invention includes surface crosslinked polymer particles prepared by surface crosslinking particles of a base resin, wherein the base resin is polymerized from water-soluble ethylene-based unsaturated monomers, and a water-soluble component, in which the water-soluble component is present in an amount of 5% by weight or less based on the total weight of the super absorbent polymer, when measured after free swelling the super absorbent polymer in a 0.9% NaCl solution for 1 hour, and the super absorbent polymer has a permeability of 50 seconds or shorter. According to the present invention, provided is a super absorbent polymer having excellent liquid permeability even when swollen without a reduction in centrifuge retention capacity or absorbency under load while having improved permeability.Type: ApplicationFiled: February 22, 2019Publication date: June 20, 2019Applicant: LG Chem, Ltd.Inventors: Chul Hee Ryu, Hyemin Lee
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Patent number: 10285866Abstract: The present invention relates to a super absorbent polymer. The super absorbent polymer according to the present invention includes surface crosslinked polymer particles prepared by surface crosslinking particles of a base resin, wherein the base resin is polymerized from water-soluble ethylene-based unsaturated monomers, and a water-soluble component, in which the water-soluble component is present in an amount of 5% by weight or less based on the total weight of the super absorbent polymer, when measured after free swelling the super absorbent polymer in a 0.9% NaCl solution for 1 hour, and the super absorbent polymer has a permeability of 50 seconds or shorter. According to the present invention, provided is a super absorbent polymer having excellent liquid permeability even when swollen without a reduction in centrifuge retention capacity or absorbency under load while having improved permeability.Type: GrantFiled: October 14, 2015Date of Patent: May 14, 2019Assignee: LG Chem, Ltd.Inventors: Chul Hee Ryu, Hyemin Lee
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Publication number: 20190040173Abstract: The present invention relates to a super absorbent polymer and a preparation method thereof, the super absorbent polymer including: surface cross-linked polymer particles prepared by surface cross-linking particles of a base resin, the base resin polymerized from a monomer composition including water-soluble ethylene-based unsaturated monomers having at least partially neutralized acidic groups; and a water-soluble component, wherein the water-soluble component has a weight average molecular weight of 150,000 to 300,000 g/mol. The super absorbent polymer may have high centrifuge retention capacity and excellent permeability at the same time, while having low content of the water-soluble component.Type: ApplicationFiled: October 12, 2018Publication date: February 7, 2019Applicant: LG Chem, Ltd.Inventors: Sang Gi Lee, Chul Hee Ryu, Kyu Pal Kim, Bhom Ri Kim
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Patent number: 10150829Abstract: The present invention relates to a super absorbent polymer and a preparation method thereof, the super absorbent polymer including: surface cross-linked polymer particles prepared by surface cross-linking particles of a base resin, the base resin polymerized from a monomer composition including water-soluble ethylene-based unsaturated monomers having at least partially neutralized acidic groups; and a water-soluble component, wherein the water-soluble component has a weight average molecular weight of 150,000 to 300,000 g/mol. The super absorbent polymer may have high centrifuge retention capacity and excellent permeability at the same time, while having low content of the water-soluble component.Type: GrantFiled: November 4, 2015Date of Patent: December 11, 2018Assignee: LG Chem, Ltd.Inventors: Sang Gi Lee, Chul Hee Ryu, Kyu Pal Kim, Bhom Ri Kim
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Publication number: 20180185819Abstract: The present invention relates to a super absorbent polymer which is excellent in various physical properties required for a super absorbent polymer, while exhibiting excellent water absorption capacity, absorption rate and liquid permeability, and a method for preparing the same.Type: ApplicationFiled: March 30, 2016Publication date: July 5, 2018Applicant: LG Chem, Ltd.Inventors: Tae Bin Ahn, Chang Sun Han, Seung Do Hong, Chul Hee Ryu, Dong Hyun Kim
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Patent number: 9808787Abstract: The present invention relates to a super absorbent polymer and a preparation method thereof. The super absorbent polymer includes surface crosslinked polymer particles prepared by surface crosslinking of particles of a base resin, wherein the base resin is polymerized from a monomer composition including water-soluble ethylene-based unsaturated monomers, and a water-soluble component, wherein the water-soluble component has a ratio (dwt/d(log M)) of 0.9 or less over molecular weights (M) ranging from 100,000 to 300,000 when measured from an eluted solution after swelling the super absorbent polymer for 1 hour, and wherein the content of the water-soluble component is 5% by weight or less, based on the total weight of the super absorbent polymer, when measured after swelling the super absorbent polymer for 1 hour. The super absorbent polymer has excellent liquid permeability even when swollen without a reduction in centrifuge retention capacity or absorbency under load while having improved permeability.Type: GrantFiled: October 6, 2016Date of Patent: November 7, 2017Assignee: LG Chem, Ltd.Inventors: Chul Hee Ryu, Hyemin Lee
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Patent number: 9708452Abstract: This disclosure relates to a method for preparing superabsorbent polymer. The method for preparing superabsorbent polymer according to one aspect of the invention comprises obtaining hydrogel polymer during the process of preparing superabsorbent polymer, and then, spraying a surface crosslinking solution comprising a surface crosslinker, alcohol, and ionic liquid to crosslink the surface of the pulverized polymer. The method for preparing superabsorbent polymer may use ionic liquid without using lower alcohol, or if lower alcohol is used together, may minimize the amount, and thus, reduce cost and additional drying treatment, and may control swelling of gel to prepare superabsorbent polymer with excellent product properties.Type: GrantFiled: May 9, 2014Date of Patent: July 18, 2017Assignee: LG CHEM, LTD.Inventors: Sang Gi Lee, Sung Soo Park, Chul Hee Ryu, Tae Young Won
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Patent number: 9701796Abstract: Provided is a method of preparing a superabsorbent polymer. According to the method of preparing the superabsorbent polymer of the present invention, provided is a superabsorbent polymer having improved physical properties, in which the superabsorbent polymer has improved absorption rate and liquid permeability without reduction in centrifuge retention capacity or absorbency under load.Type: GrantFiled: December 5, 2014Date of Patent: July 11, 2017Assignee: LG Chem, Ltd.Inventors: Hwayoon Jung, Chang Sun Han, Chul Hee Ryu, Mi Young Kim, Tae Bin Ahn
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Publication number: 20170021334Abstract: The present invention relates to a super absorbent polymer and a preparation method thereof. The super absorbent polymer includes surface crosslinked polymer particles prepared by surface crosslinking of particles of a base resin, wherein the base resin is polymerized from a monomer composition including water-soluble ethylene-based unsaturated monomers, and a water-soluble component, wherein the water-soluble component has a ratio (dwt/d(log M)) of 0.9 or less over molecular weights (M) ranging from 100,000 to 300,000 when measured from an eluted solution after swelling the super absorbent polymer for 1 hour, and wherein the content of the water-soluble component is 5% by weight or less, based on the total weight of the super absorbent polymer, when measured after swelling the super absorbent polymer for 1 hour. The super absorbent polymer has excellent liquid permeability even when swollen without a reduction in centrifuge retention capacity or absorbency under load while having improved permeability.Type: ApplicationFiled: October 6, 2016Publication date: January 26, 2017Applicant: LG Chem, Ltd.Inventors: Chul Hee Ryu, Hyemin Lee
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Patent number: 9486778Abstract: The present invention relates to a super absorbent polymer and a preparation method thereof. The super absorbent polymer includes surface crosslinked polymer particles prepared by surface crosslinking of particles of a base resin, wherein the base resin is polymerized from a monomer composition including water-soluble ethylene-based unsaturated monomers, and a water-soluble component, wherein the water-soluble component has a ratio (dwt/d(log M)) of 0.9 or less over molecular weights (M) ranging from 100,000 to 300,000 when measured from an eluted solution after swelling the super absorbent polymer for 1 hour, and wherein the content of the water-soluble component is 5% by weight or less, based on the total weight of the super absorbent polymer, when measured after swelling the super absorbent polymer for 1 hour. The super absorbent polymer has excellent liquid permeability even when swollen without a reduction in centrifuge retention capacity or absorbency under load while having improved permeability.Type: GrantFiled: October 9, 2015Date of Patent: November 8, 2016Assignee: LG Chem, Ltd.Inventors: Chul Hee Ryu, Hyemin Lee
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Publication number: 20160311985Abstract: Provided is a method of preparing a superabsorbent polymer. According to the method of preparing the superabsorbent polymer of the present invention, provided is a superabsorbent polymer having improved physical properties, in which the superabsorbent polymer has improved absorption rate and liquid permeability without reduction in centrifuge retention capacity or absorbency under load.Type: ApplicationFiled: December 5, 2014Publication date: October 27, 2016Applicant: LG CHEM, LTD.Inventors: Hwayoon Jung, Chang Sun Han, Chul Hee Ryu, Mi Young Kim, Tae Bin Ahn
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Publication number: 20160280866Abstract: This disclosure relates to a method for preparing superabsorbent polymer. The method for preparing superabsorbent polymer according to one aspect of the invention comprises obtaining hydrogel polymer during the process of preparing superabsorbent polymer, and then, spraying a surface crosslinking solution comprising a surface crosslinker, alcohol, and ionic liquid to crosslink the surface of the pulverized polymer. The method for preparing superabsorbent polymer may use ionic liquid without using lower alcohol, or if lower alcohol is used together, may minimize the amount, and thus, reduce cost and additional drying treatment, and may control swelling of gel to prepare superabsorbent polymer with excellent product properties.Type: ApplicationFiled: May 9, 2014Publication date: September 29, 2016Inventors: Sang Gi LEE, Sung Soo PARK, Chul Hee RYU, Tae Young WON
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Patent number: 9433921Abstract: The present invention relates to a method for preparing a super absorbent polymer. The method for preparing a super absorbent polymer according to the present invention comprises the steps of: 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; mixing a fine powder having a particle diameter of 180 ?m or less and a polymer having a particle diameter of 300 ?m or more among the pulverized polymer; and adding steam to the mixture to carry out a reassembling. According to the present invention, the super absorbent polymer having a high fine powder aggregation strength can be obtained.Type: GrantFiled: July 17, 2014Date of Patent: September 6, 2016Assignee: LG Chem, Ltd.Inventors: Chul Hee Ryu, Gi Cheul Kim
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Publication number: 20160208035Abstract: The present invention relates to a super absorbent polymer. The super absorbent polymer according to the present invention includes surface crosslinked polymer particles prepared by surface crosslinking particles of a base resin, wherein the base resin is polymerized from water-soluble ethylene-based unsaturated monomers, and a water-soluble component, in which the water-soluble component is present in an amount of 5% by weight or less based on the total weight of the super absorbent polymer, when measured after free swelling the super absorbent polymer in a 0.9% NaCl solution for 1 hour, and the super absorbent polymer has a permeability of 50 seconds or shorter. According to the present invention, provided is a super absorbent polymer having excellent liquid permeability even when swollen without a reduction in centrifuge retention capacity or absorbency under load while having improved permeability.Type: ApplicationFiled: October 14, 2015Publication date: July 21, 2016Applicant: LG CHEM, LTD.Inventors: Chul Hee Ryu, Hyemin Lee
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Publication number: 20160175813Abstract: The present invention relates to a method for preparing a super absorbent polymer. The method for preparing a super absorbent polymer according to the present invention comprises the steps of: 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; mixing a fine powder having a particle diameter of 180 ?m or less and a polymer having a particle diameter of 300 ?m or more among the pulverized polymer; and adding steam to the mixture to carry out a reassembling. According to the present invention, the super absorbent polymer having a high fine powder aggregation strength can be obtained.Type: ApplicationFiled: July 17, 2014Publication date: June 23, 2016Applicant: LG Chem, Ltd.Inventors: Chul Hee Ryu, Gi Cheul Kim
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Publication number: 20160053037Abstract: The present invention relates to a super absorbent polymer and a preparation method thereof, the super absorbent polymer including: surface cross-linked polymer particles prepared by surface cross-linking particles of a base resin, the base resin polymerized from a monomer composition including water-soluble ethylene-based unsaturated monomers having at least partially neutralized acidic groups; and a water-soluble component, wherein the water-soluble component has a weight average molecular weight of 150,000 to 300,000 g/mol. The super absorbent polymer may have high centrifuge retention capacity and excellent permeability at the same time, while having low content of the water-soluble component.Type: ApplicationFiled: November 4, 2015Publication date: February 25, 2016Applicant: LG Chem, Ltd.Inventors: Sang Gi Lee, Chul Hee Ryu, Kyu Pal Kim, Bhom Ri Kim
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Publication number: 20160030921Abstract: The present invention relates to a super absorbent polymer and a preparation method thereof. The super absorbent polymer includes surface crosslinked polymer particles prepared by surface crosslinking of particles of a base resin, wherein the base resin is polymerized from a monomer composition including water-soluble ethylene-based unsaturated monomers, and a water-soluble component, wherein the water-soluble component has a ratio (dwt/d(log M)) of 0.9 or less over molecular weights (M) ranging from 100,000 to 300,000 when measured from an eluted solution after swelling the super absorbent polymer for 1 hour, and wherein the content of the water-soluble component is 5% by weight or less, based on the total weight of the super absorbent polymer, when measured after swelling the super absorbent polymer for 1 hour. The super absorbent polymer has excellent liquid permeability even when swollen without a reduction in centrifuge retention capacity or absorbency under load while having improved permeability.Type: ApplicationFiled: October 9, 2015Publication date: February 4, 2016Applicant: LG CHEM, LTD.Inventors: Chul Hee Ryu, Hyemin Lee
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Patent number: 9156974Abstract: A method of preparing a super absorbent polymer (SAP) includes the steps of preparing a first hydrogel polymer by carrying out a thermal polymerization or photo polymerization of a monomer composition including a water-soluble ethylene-based unsaturated monomer and a polymerization initiator; preparing a second hydrogel polymer by carrying out a thermal polymerization or photo polymerization of a monomer composition including a water-soluble ethylene-based unsaturated monomer and a polymerization initiator; drying and milling the first hydrogel polymer and distributing the first hydrogel polymer into a fine powder having a particle diameter below 150 ?m and a base resin having a particle diameter of 150 ?m to 850 ?m; fabricating a reassembled body of the fine powder by mixing the fine powder and the second hydrogel polymer; and mixing the reassembled body of the fine powder with the first hydrogel polymer, and drying and milling the same.Type: GrantFiled: November 15, 2013Date of Patent: October 13, 2015Assignee: LG CHEM, LTD.Inventors: Yong Hun Lee, Kyu Pal Kim, Chang Sun Han, Gi Cheul Kim, Chul Hee Ryu