# US 12,186,172 B2 · Absorbent article > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,186,172 B2 - Document ID: US12186172B2 - Status: Granted - Kind: B2 - Application number: 17/632,178 - Filed: 2020-09-08 - Published: 2022-09-08 - Granted: 2025-01-07 - Earliest claimed: 2019-09-27 - Assignees: Daio Paper Corporation - Applicants: Daio Paper Corporation - Inventors: Hiroki Matsuoka - Web page: https://patentgrep.com/patent/US12186172B2 ## CPC - A61F 13/535: inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes ({A61F13/5323,} A61F13/537 take precedence) - A61F 13/5323: {having absorbent material located in discrete regions, e.g. pockets} - A61F 13/536: having discontinuous areas of compression - A61L 15/24: Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof {(A61L15/225 takes precedence)} - A61L 15/28: Polysaccharides or their derivatives {(A61L15/225 takes precedence)} - A61L 15/60: Liquid-swellable gel-forming materials, e.g. super-absorbents - A61F 2013/530131: {being made in fibre but being not pulp} - A61F 2013/530496: {being fixed to fibres} - A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C) - 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) ## Abstract A configuration in which an upper auxiliary layer of an absorber includes a super absorbent nonwoven fabric having a surface exposed on an uppermost surface of the absorber and having a Klemm water absorptiveness of 100 mm or more, first super absorbent polymer particles adjacent to a back surface of the super absorbent nonwoven fabric. The main absorption layer of the absorber is a cell absorbing sheet including second super absorbent polymer particles contained in the cells arranged at intervals. A convex bulging upward is formed at each cell in an upper sheet. The first super absorbent polymer particles are fixed to the upper surface of the upper sheet. An adhesion amount of the first super absorbent polymer particles on the upper surface of the upper sheet increases from the top of a convex toward the bottom of a valley between a convex and a convex adjacent each other. ## Claims ### Claim 1 An absorbent article comprising: an absorber; and a liquid pervious top sheet disposed on a front surface side of the absorber, wherein the absorber includes an upper auxiliary layer disposed on an uppermost portion and a main absorption layer disposed on a back surface side of the upper auxiliary layer, the upper auxiliary layer includes a super absorbent nonwoven fabric having a surface exposed on an uppermost surface of the absorber and having a Klemm water absorptiveness of 100 mm or more, and first super absorbent polymer particles adjacent to a back surface of the super absorbent nonwoven fabric, the main absorption layer is a cell absorbing sheet including a liquid pervious upper sheet and a lower sheet, cells which are portions surrounded by bonded portions of the upper sheet and the lower sheet and in which the upper sheet and the lower sheet are not bonded to each other, and a particulate material which contains second super absorbent polymer particles and which is contained in the cells, the cells are arranged at intervals in the cell absorbing sheet, a convex bulging upward is formed in a portion located at each cell in the upper sheet, the first super absorbent polymer particles are fixed to the upper surface of the upper sheet of the main absorption layer, and an adhesion amount of the first super absorbent polymer particles on the upper surface of the upper sheet increases from a top of the convex toward a bottom of a valley located between a convex and a convex adjacent each other. ### Claim 2 (depends on 1) The absorbent article according to claim 1, wherein in the first super absorbent polymer particles, a ratio of particles having a particle size of more than 500 μm is 30% by weight or less, the ratio of particles having a particle size of 500 μm or less and more than 180 μm is 60% by weight or more, the ratio of particles having a particle size of more than 106 μm and 180 μm or less is 10% by weight or less, and the ratio of particles having a particle size of 106 μm or less is 10% by weight or less, and the adhesion amount of the first super absorbent polymer particles on the upper surface of the upper sheet is 50 to 150 g/m2. ### Claim 3 (depends on 2) The absorbent article according to claim 2, wherein a basis weight of the second super absorbent polymer particles in the main absorption layer is 150 to 250 g/m2. ### Claim 4 (depends on 3) The absorbent article according to claim 3, wherein the lower sheet is a nonwoven fabric having a fineness of 1.5 to 6.0 dtex, a basis weight of 25 to 50 g/m2, and a thickness of 0.1 to 1.0 mm. ### Claim 5 (depends on 3) The absorbent article according to claim 3, wherein a size of the convex of the upper sheet in a front-back direction is 6 to 30 mm, a size of the convex of the upper sheet in a width direction is 7 to 50 mm, a width of the bonded portion is 1.0 to 1.8 mm, and a depth of the valley of the upper sheet is 1.0 to 7.0 mm. ### Claim 6 (depends on 2) The absorbent article according to claim 2, wherein the first super absorbent polymer particles are manufactured by a crushing method. ### Claim 7 (depends on 2) The absorbent article according to claim 2, wherein the lower sheet is a nonwoven fabric having a fineness of 1.5 to 6.0 dtex, a basis weight of 25 to 50 g/m2, and a thickness of 0.1 to 1.0 mm. ### Claim 8 (depends on 2) The absorbent article according to claim 2, wherein a size of the convex of the upper sheet in a front-back direction is 6 to 30 mm, a size of the convex of the upper sheet in a width direction is 7 to 50 mm, a width of the bonded portion is 1.0 to 1.8 mm, and a depth of the valley of the upper sheet is 1.0 to 7.0 mm. ### Claim 9 (depends on 1) The absorbent article according to claim 1, wherein the first super absorbent polymer particles are manufactured by a crushing method. ### Claim 10 (depends on 9) The absorbent article according to claim 9, wherein a basis weight of the second super absorbent polymer particles in the main absorption layer is 150 to 250 g/m2. ### Claim 11 (depends on 9) The absorbent article according to claim 9, wherein the lower sheet is a nonwoven fabric having a fineness of 1.5 to 6.0 dtex, a basis weight of 25 to 50 g/m2, and a thickness of 0.1 to 1.0 mm. ### Claim 12 (depends on 9) The absorbent article according to claim 9, wherein a size of the convex of the upper sheet in a front-back direction is 6 to 30 mm, a size of the convex of the upper sheet in a width direction is 7 to 50 mm, a width of the bonded portion is 1.0 to 1.8 mm, and a depth of the valley of the upper sheet is 1.0 to 7.0 mm. ### Claim 13 (depends on 1) The absorbent article according to claim 1, wherein the lower sheet is a nonwoven fabric having a fineness of 1.5 to 6.0 dtex, a basis weight of 25 to 50 g/m2, and a thickness of 0.1 to 1.0 mm. ### Claim 14 (depends on 13) The absorbent article according to claim 13, wherein a size of the convex of the upper sheet in a front-back direction is 6 to 30 mm, a size of the convex of the upper sheet in a width direction is 7 to 50 mm, a width of the bonded portion is 1.0 to 1.8 mm, and a depth of the valley of the upper sheet is 1.0 to 7.0 mm. ### Claim 15 (depends on 1) The absorbent article according to claim 1, wherein a size of the convex of the upper sheet in a front-back direction is 6 to 30 mm, a size of the convex of the upper sheet in a width direction is 7 to 50 mm, a width of the bonded portion is 1.0 to 1.8 mm, and a depth of the valley of the upper sheet is 1.0 to 7.0 mm.