公开(公告)号：US10519262B2

公开(公告)日：2019-12-31

申请号：US15574806

申请日：2017-01-31

Applicant: LG CHEM, LTD.

Inventor： Dae Woo Lee ,  Chang Hun Han ,  Jae Bum Seo ,  Jung Tae Park ,  Gyu Sun Kim

IPC: C08F212/10 ,  C08K5/14 ,  C08F214/10 ,  C08F6/10 ,  C08F297/04 ,  C08L55/02 ,  C08F2/38 ,  C08F2/44

Abstract: The present invention provides a method of preparing an aromatic vinyl-unsaturated nitrile-based copolymer in which, when an aromatic vinyl-unsaturated nitrile-based copolymer in which a content of a structural unit derived from unsaturated nitrile monomers in the copolymer is in the range of 22 to 30 wt % is prepared, oligomer content and unreacted monomer content are decreased, resulting in excellent heat resistance, significantly improved surface quality, and particularly, reduced generation of residue on a product surface when used in a closed high temperature environment and reduced occurrence of mold deposits during injection molding, and an aromatic vinyl-unsaturated nitrile-based copolymer prepared using the method.

公开(公告)号：US09777088B2

公开(公告)日：2017-10-03

申请号：US15106785

申请日：2015-12-14

Applicant: LG CHEM, LTD.

Inventor： Byoung Il Kang ,  Eun Jung Choi ,  Da Eun Sung ,  Chang Hun Han

IPC: C08F212/10 ,  C08F279/04 ,  C08L25/12

CPC classification number: C08F212/10 ,  C08F212/12 ,  C08F279/04 ,  C08F2500/01 ,  C08F2800/20 ,  C08L25/12 ,  C08L25/16 ,  C08L2201/08 ,  C08F220/44 ,  C08F220/20 ,  C08L55/02

Abstract: Disclosed are a heat-resistant SAN resin, a method of producing the same and a heat-resistant SAN resin composition comprising the same. More specifically, disclosed are a heat-resistant SAN resin produced using ingredients comprising 52 to 78% by weight of alpha-methylstyrene, 20 to 40% by weight of a vinyl cyanide compound and 2 to 8% by weight of hydroxyalkyl (meth)acrylate, a method of producing the same and a heat-resistant SAN resin composition comprising the same. Advantageously, provided are a heat-resistant SAN resin with maintained heat resistance, improved polymerization conversion rate and increased weight average molecular weight, a method of producing the same, and a heat-resistant SAN resin composition containing the same with excellent chemical resistance, superior mechanical properties and good balance between properties.

公开(公告)号：US20250032662A1

公开(公告)日：2025-01-30

申请号：US18836835

申请日：2023-11-16

Applicant: LG Chem, Ltd.

Inventor： Hyemin Lee ,  Yun Kyung Do ,  Chang Hun Han ,  Hyemi Nam

IPC: A61L15/60 ,  A61L15/24 ,  B01J20/26 ,  B01J20/28 ,  B01J20/30 ,  B01J20/32

Abstract: A super absorbent polymer has excellent absorption rate and absorption performance while exhibiting excellent rewet properties even without containing pulp. A preparation method of the super absorbent polymer is also provided.

公开(公告)号：US20250011550A1

公开(公告)日：2025-01-09

申请号：US18706839

申请日：2022-12-14

Applicant: LG Chem, Ltd.

Inventor： Minsu Kim ,  Chang Hun Han ,  Tae Young Won ,  Jungmin Sohn ,  Junwye Lee ,  Jihye Ryu

IPC: C08J3/075 ,  C08J3/12 ,  C08J3/24 ,  C08J9/08

Abstract: Provided is a preparation method of a super absorbent polymer. More specifically, it relates to a method for preparing a super absorbent polymer in which absorption properties of the finally prepared super absorbent polymer are improved by adjusting the timing of adding a reducing agent in the step of forming a hydrogel polymer through foam polymerization.

公开(公告)号：US11718694B2

公开(公告)日：2023-08-08

申请号：US17271414

申请日：2019-12-20

Applicant: LG Chem, Ltd.

Inventor： Hyemin Lee ,  Tae Young Won ,  Jungmin Sohn ,  Junwye Lee ,  Seongbeom Heo ,  Kwangin Shin ,  Chang Hun Han

IPC: C08F220/06 ,  C08J3/075 ,  C08J3/12 ,  C08J3/24

CPC classification number: C08F220/06 ,  C08J3/075 ,  C08J3/122 ,  C08J3/245 ,  C08J2333/02

Abstract: The present disclosure relates to a super absorbent polymer and a preparation method of the same, which not only has excellent basic absorption performance, but also exhibits an improved absorption rate, and the like. The super absorbent polymer includes a base resin powder containing a first cross-linked polymer of a water-soluble ethylene-based unsaturated monomer having at least partially neutralized acidic groups; and a surface cross-linked layer containing a second cross-linked polymer in which the first cross-linked polymer is additionally cross-linked by a surface cross-linking agent on the base resin powder, wherein the super absorbent polymer contains less than 9.9% by number of super absorbent polymer particles having an aspect ratio, which is defined as shortest diameter/longest diameter of each super absorbent polymer particle, of less than 0.5, a vortex time is 5 to 55 seconds by a vortex method, and a surface tension is 50 to 80 mN/m.

公开(公告)号：US11635421B2

公开(公告)日：2023-04-25

申请号：US16466890

申请日：2018-08-24

Applicant: LG Chem, Ltd.

Inventor： Yeon Soo Kim ,  Hye Mi Nam ,  Hyunsup Lee ,  Sang Gi Lee ,  Chang Hun Han ,  Myung Han Lee ,  Hyejin Han

IPC: G01N33/32 ,  A61F13/53 ,  G01N15/08 ,  G01N15/00

Abstract: A SAP evaluation apparatus includes: a main body installed with a lifting bar that is raised or lowered; a container portion installed under the lifting bar in the main body and having an internal containing space for containing an absorber; an operating portion connected to the lifting bar and having a lifting plate that is raised or lowered within the containing space and applies pressure to the absorber and an injection portion for injecting an ink in the direction of the absorber; a dispersion measurement portion for measuring the dispersion of the ink through the absorber; and a controller installed at the main body to measure absorption of the ink into the absorber and measure swelling capacity of the absorber while the ink is injected into the absorber.

公开(公告)号：US20210040271A1

公开(公告)日：2021-02-11

申请号：US16649341

申请日：2019-06-11

Applicant: LG Chem, Ltd.

Inventor： Yong Hun Lee ,  Mookon Kim ,  Dae Woo Nam ,  Hyemi Nam ,  Sang Gi Lee ,  Chang Hun Lee ,  Jiyoon Jeong ,  Chang Hun Han

IPC: C08J3/075 ,  C08J3/24 ,  C08J3/12 ,  C08L33/02 ,  C08L23/06 ,  C08K3/011 ,  C08J9/04

Abstract: A superabsorbent polymer having optimized gel strength and exhibiting an improved absorption rate without increasing a specific surface area by chemical foaming or a physical method, and a preparation method thereof, are provided.

公开(公告)号：US10053569B2

公开(公告)日：2018-08-21

申请号：US14909942

申请日：2015-04-08

Applicant: LG CHEM, LTD.

Inventor： Byoung Il Kang ,  Chang Hun Han ,  Eun Jung Choi ,  Da Eun Sung

IPC: C08L25/16 ,  C08F212/12

CPC classification number: C08L25/16 ,  C08F212/12 ,  C08F220/44 ,  C08F226/06 ,  C08L55/02 ,  C08L51/04

Abstract: Provided is a styrene resin composition including α-methyl styrene, acrylonitrile and vinyl imidazole, and having an improved conversion rate while maintaining excellent mechanical and chemical properties, a styrene resin composition including the same, and a styrene resin molded product manufactured therefrom. Accordingly, the heat-resistant styrene copolymer is effective in improving a conversion rate without deformation and mechanical and chemical property decline of the material itself, and as a result, commercialization may be readily accomplished due to enhanced productivity. In addition, the styrene resin molded product manufactured from the styrene resin composition according to the present invention includes the heat-resistant styrene copolymer as a matrix copolymer, and therefore, has excellent impact strength, tensile strength, tensile elongation and flowability while having high heat resistance.

公开(公告)号：US20240247110A1

公开(公告)日：2024-07-25

申请号：US18027543

申请日：2021-12-17

Applicant: LG Chem, Ltd.

Inventor： Hyemin Lee ,  Jungmin Sohn ,  Jihye Ryu ,  Chang Hun Han ,  Taebin Ahn

IPC: C08J3/075 ,  C08J3/12 ,  C08J3/24 ,  C08J9/12 ,  C08K3/36 ,  C08K5/00 ,  C08K5/098

CPC classification number: C08J3/075 ,  C08J3/12 ,  C08J3/245 ,  C08J9/122 ,  C08K3/36 ,  C08K5/0025 ,  C08K5/098 ,  C08J2201/026 ,  C08J2205/022 ,  C08J2205/044 ,  C08J2333/02

Abstract: The present disclosure relates to a super absorbent polymer and a method for preparing the same. More specifically, it relates to a super absorbent polymer including a plurality of micropores, specifically an average of 7 or more micropores per particle, having an average diameter of 100 μm or less and a maximum diameter of 300 μm or less, and thus exhibiting an improved absorption rate and a high surface tension, and a method for preparing the super absorbent polymer.

公开(公告)号：US12030967B2

公开(公告)日：2024-07-09

申请号：US17057790

申请日：2019-10-01

Applicant: LG Chem, Ltd.

Inventor： Tae Young Won ,  Jungmin Sohn ,  Hyemin Lee ,  Junwye Lee ,  Seongbeom Heo ,  Kwangin Shin ,  Chang Hun Han

IPC: C08F2/44 ,  B01J20/26 ,  B01J20/30 ,  C08F2/01 ,  C08F220/06 ,  C08J3/24 ,  C08J9/08 ,  C08J9/36

CPC classification number: C08F2/44 ,  B01J20/267 ,  B01J20/3064 ,  C08F2/01 ,  C08F220/06 ,  C08J3/245 ,  C08J9/08 ,  C08J9/36 ,  B01J2220/68 ,  C08J2201/026 ,  C08J2333/08

Abstract: The present disclosure relates to a preparation method of a super absorbent polymer capable of preparing a super absorbent polymer exhibiting an improved absorption rate while reducing an amount of a blowing agent used. The preparation method of a super absorbent polymer includes: preparing a monomer mixture including a water-soluble ethylene-based unsaturated monomer having at least partially neutralized acidic groups and an internal cross-linking agent; adjusting a dynamic pressure applied to the monomer mixture being transferred to 140 Pa or more by controlling a transfer rate while transferring the monomer mixture to a polymerization reactor; cross-linking and polymerizing the monomer mixture transferred to the polymerization reactor to form a hydrogel polymer; drying, pulverizing and classifying the hydrogel polymer to form a base resin powder; and further cross-linking a surface of the base resin powder in the presence of a surface cross-linking agent to form a surface cross-linked layer.