# US 12,006,405 B2 · Super absorbent polymer and method for producing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,006,405 B2 - Document ID: US12006405B2 - Status: Granted - Kind: B2 - Application number: 15/774,496 - Filed: 2016-06-23 - Published: 2020-04-23 - Granted: 2024-06-11 - Earliest claimed: 2016-06-01 - Assignees: LG Chem, Ltd. - Applicants: LG Chem, Ltd. - Inventors: Kyu Pal Kim; Gi Cheul Kim; Sung Soo Park - Web page: https://patentgrep.com/patent/US12006405B2 ## CPC - C08J 3/075: Macromolecular gels - C08L 33/02: Homopolymers or copolymers of acids; Metal or ammonium salts thereof - A61L 15/60: Liquid-swellable gel-forming materials, e.g. super-absorbents - C08F 20/04: Acids, Metal salts or ammonium salts thereof - 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} - C08K 3/013: Fillers, pigments or reinforcing additives - C08K 3/34: Silicon-containing compounds - C08K 5/0025: {Crosslinking or vulcanising agents; including accelerators} - C08K 5/053: Polyhydroxylic alcohols - C08K 5/11: of acyclic polycarboxylic acids - C08K 5/1565: Five-membered rings - C08J 2300/14: Water soluble or water swellable polymers, e.g. aqueous gels - C08J 2333/02: Homopolymers or copolymers of acids; Metal or ammonium salts thereof - C08J 2333/08: Homopolymers or copolymers of acrylic acid esters - 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) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - 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 - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) ## Abstract The present invention relates to a super absorbent polymer and a method for producing same. The super absorbent polymer can achieve a high deodorizing function while exhibiting excellent absorption properties. As such, by using the super absorbent polymer, adult diapers having a thin thickness and high deodorizing function can be provided. ## Claims ### Claim 1 A super absorbent polymer comprising: a base resin powder including a cross-linked polymer of a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups; a surface cross-linked layer that is further cross-linked from the cross-linked polymer and is formed on the base resin powder; and an inorganic material, wherein the super absorbent polymer has an ammonia removal efficiency of 92% to 98%, a centrifuge retention capacity (CRC) for a physiological saline solution of 32.9 to 35.8 g/g, and an absorbency under load (AUL) under 0.9 psi for a physiological saline solution of 21.1 to 23.4 g/g, wherein the inorganic material is laponite, wherein the superabsorbent polymer has a pH of 5.40 to 5.67, and wherein the inorganic material is present in an amount of 0.1 to 1.0 parts by weight with respect to 100 parts by weight of the base resin powder. ### Claim 2 (depends on 1) The super absorbent polymer of claim 1, wherein the cross-linked polymer is a cross-linked polymer of water-soluble ethylenically unsaturated monomer having an acidic group that is neutralized to 55 to 65 mol % with respect to the total monomer. ### Claim 3 (depends on 1) A method for producing the super absorbent polymer of claim 1, the method comprising the steps of: carrying out a cross-linking polymerization of a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups and a monomer mixture containing an internal cross-linking agent to form a hydrogel polymer; drying, pulverizing, and classifying the hydrogel polymer to form a base polymer powder; and further cross-linking the surface of the base polymer powder in the presence of a surface cross-linking agent to form a surface cross-linked layer, and comprising adding laponite as an inorganic material in at least one of the step of forming the hydrogel polymer, the step of forming the base polymer powder and the step of forming the surface cross-linked layer. ### Claim 4 (depends on 3) The method for producing the super absorbent polymer of claim 3, wherein the water-soluble ethylenically unsaturated monomer includes at least one of anionic monomers of (meth)acrylic acid, maleic acid, maleic anhydride, fumaric acid, crotonic acid, itaconic acid, sorbic acid, vinylphosphonic acid, vinylsulfonic acid, allylsulfonic acid, 2-(meth)acryloylethanesulfonic acid, 2-(meth)acryloyloxyethanesulfonic acid, 2-(meth)acryloylpropanesulfonic acid or 2-(meth)acrylamido-2-methylpropane sulfonic acid. ### Claim 5 (depends on 3) The method for producing the super absorbent polymer of claim 3, wherein it has a pH of 5.4 to 5.67. ### Claim 6 (depends on 3) The method for producing the super absorbent polymer of claim 3, using a water-soluble ethylenically unsaturated monomer having an acidic group that is neutralized to 55 to 65 mol % with respect to the total monomer can be used. ### Claim 7 (depends on 3) The method for producing the super absorbent polymer of claim 3, wherein the internal cross-linking agent includes at least one selected from the group consisting of polyethylene glycol diacrylate (PEGDA), glycerine diacrylate, glycerin triacrylate, unmodified or ethoxylated trimethylolpropane triacrylate (TMPTA), hexanediol diacrylate, and triethylene glycol diacrylate. ### Claim 8 (depends on 3) The method for producing the super absorbent polymer of claim 3, wherein an inorganic material is added in the step of forming the hydrogel polymer and the step of forming the base resin powder. ### Claim 9 (depends on 3) The method for producing the super absorbent polymer of claim 3, wherein the inorganic material is added in an amount of 0.1 to 1.0 part by weight with respect to 1.00 parts by weight of the base polymer powder. ### Claim 10 (depends on 3) The method for producing the super absorbent polymer of claim 3, wherein the surface cross-linking agent includes at least one polyol selected from the group consisting of ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, 1,2-hexanediol, 1,3-hexanediol, 2-methyl-1,3-propanediol, 2,5-hexanediol, 2-methyl-1,3-pentanediol, 2-methyl-2,4-pentanediol, tripropylene glycol and glycerol; or at least one carbonate-based compound selected from the group consisting of ethylene carbonate and propylene carbonate. ### Claim 11 (depends on 3) The method for producing the super absorbent polymer of claim 3, wherein the surface cross-linking agent is used in an amount of about 0.01 to 3% by weight with respect to the total weight of the base polymer powder. ### Claim 12 (depends on 3) The method for producing the super absorbent polymer of claim 3, wherein the surface cross-linked layer is formed at a temperature of 100 to 250° C. ### Claim 13 (depends on 3) The method for producing the super absorbent polymer of claim 3, comprising forming a surface cross-linked layer or adding an acid after forming the surface cross-linked layer. ### Claim 14 (depends on 1) The super absorbent polymer of claim 1, wherein the water-soluble ethylenically unsaturated monomer is acrylic acid.