# US 2023/0264172 A1 · Super Absorbent Polymer and Preparation Method Thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0264172 A1 - Document ID: US20230264172A1 - Status: Published application - Kind: A1 - Application number: 18/010,365 - Filed: 2022-03-17 - Published: 2023-08-24 - Earliest claimed: 2021-03-19 - Assignees: LG Chem, Ltd. - Applicants: LG Chem, Ltd. - Inventors: Soonhee Kang; Seonjung Jung; Hyungsam Choi; Leehyeon Baek; Ji Seok Lee; Haesung Yun - Web page: https://patentgrep.com/patent/US20230264172A1 ## CPC - B01J 20/267: {Cross-linked polymers} - C08J 3/075: Macromolecular gels - A01N 37/40: having at least one carboxylic group or a thio analogue, or a derivative thereof, and one oxygen or sulfur atom attached to the same aromatic ring system - A01P 1/00: Disinfectants; Antimicrobial compounds or mixtures thereof - A61L 15/46: Deodorants or malodour counteractants, e.g. to inhibit the formation of ammonia or bacteria - A61L 15/60: Liquid-swellable gel-forming materials, e.g. super-absorbents - C08F 220/06: Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof - C08J 3/12: Powdering or granulating - C08J 3/245: {Differential crosslinking of one polymer with one crosslinking type, e.g. surface crosslinking} - C08F 2800/20: as weight or mass percentages - C08F 2810/20: leading to a crosslinking, either explicitly or inherently - C08J 2333/02: Homopolymers or copolymers of acids; Metal or ammonium salts thereof - C08J 2433/14: of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen - B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) - A01N: PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF (preservation of food or foodstuff A23); BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES (preparations for medical, dental or toiletry purposes which kill or prevent the growth or proliferation of unwanted organisms A61K); PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS - A01P: BIOCIDAL, PEST REPELLANT, PEST ATTRACTANT OR PLANT GROWTH REGULATORY ACTIVITY OF CHEMICAL COMPOUNDS OR PREPARATIONS - A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K) - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS ## Abstract The present disclosure relates to a super absorbent polymer, and a preparation method of the same. More specifically, there are provided a super absorbent polymer capable of exhibiting improved bacterial growth-inhibitory property without lowering absorption performance, and a preparation method of the same. ## Claims ### Claim 1 A super absorbent polymer comprising a polymer of an acrylic acid-based monomer containing acidic groups in which at least a portion of the acidic groups is neutralized; a polymerizable antimicrobial monomer represented by the following Chemical Formula 1; and an internal cross-linking agent, wherein the polymerizable antimicrobial monomer is included in the polymer in an amount of 0.2 to 20 parts by weight based on 100 parts by weight of the acrylic acid-based monomer: in the Chemical Formula 1, R1 to R3 are each independently hydrogen or methyl, and A is a substituted or unsubstituted C6 to C60 aromatic ring. ### Claim 2 (depends on 1) The super absorbent polymer of claim 1, wherein the polymerizable antimicrobial monomer is included in the polymer in an amount of 0.5 to 2 parts by weight based on 100 parts by weight of the acrylic acid-based monomer. ### Claim 3 (depends on 1) The super absorbent polymer of claim 1, wherein in the Chemical Formula 1, A is a benzene ring unsubstituted or substituted with at least one substituent selected from the group consisting of a C1 to C4 alkyl group, a hydroxyl group and a carboxyl group. ### Claim 4 (depends on 1) The super absorbent polymer of claim 1, wherein the polymerizable antimicrobial monomer is any one selected from the group consisting of: ### Claim 5 (depends on 1) The super absorbent polymer of claim 1, further comprising a surface cross-linked layer formed by further cross-linking the polymer using a surface cross-linking agent on the polymer. ### Claim 6 (depends on 1) The super absorbent polymer of claim 1, wherein the super absorbent polymer exhibits antimicrobial activity against at least one of Gram-negative bacteria and Gram-positive bacteria. ### Claim 7 (depends on 6) The super absorbent polymer of claim 6, wherein the Gram-negative bacteria is Proteus mirabilis, or Escherichia coli, and the Gram-positive bacteria is Enterococcus faecalis. ### Claim 8 (depends on 1) The super absorbent polymer of claim 1, wherein the super absorbent polymer has centrifuge retention capacity (CRC) to saline (0.9 wt % aqueous solution of sodium chloride) for 30 minutes measured in accordance with the EDANA WSP 241.3 of 31 to 40 g/g. ### Claim 9 A preparation method of a super absorbent polymer, comprising the steps of: preparing a monomer composition by mixing an acrylic acid-based monomer containing an acidic group, a polymerizable antimicrobial monomer represented by the following Chemical Formula 1, a basic material, an internal cross-linking agent, and a polymerization initiator; forming a hydrogel polymer by performing thermal polymerization or photopolymerization on the monomer composition; and forming a super absorbent polymer containing a polymer by drying, pulverizing and classifying the hydrogel polymer, wherein the polymerizable antimicrobial monomer is used in an amount of 0.2 to 20 parts by weight based on 100 parts by weight of the acrylic acid-based monomer: in the Chemical Formula 1, R1 to R3 are each independently hydrogen or methyl, and A is a substituted or unsubstituted C6 to C60 aromatic ring. ### Claim 10 (depends on 9) The preparation method of a super absorbent polymer of claim 9, wherein the degree of neutralization of the acrylic acid-based monomer and the polymerizable antimicrobial monomer in the monomer composition is each independently 40 to 95 mol %. ### Claim 11 (depends on 9) The preparation method of a super absorbent polymer of claim 9, further comprising a surface cross-linking step of heat-treating the super absorbent polymer in the presence of a surface cross-linking agent. ### Claim 12 (depends on 1, 2, 3, 4, 5, 6, 7, 8) A hygienic product comprising the super absorbent polymer according to any one of claims 1 to 8.