Absorbent article

Patent metadata

Field	Value
Publication number	US-9381122-B2
Application number	US-201314432026-A
Country	US
Kind code	B2
Filing date	Sep 20, 2013
Priority date	Sep 30, 2012
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

In an absorbent article, in which each of pressure-bonded parts has a linear shape extending in the length direction of the absorbent article, the pressure-bonded parts are formed with spacing at regular intervals in a discontinuous manner with respect to the length direction of the absorbent article and are also formed in multiple lines with spacing at regular intervals with respect to the width direction of the absorbent article, depressed parts are formed on a back-sheet-facing surface of an absorbent body that is located beneath the pressure-bonded parts, each of an excretory opening-contacting region in a top sheet and the pressure-bonded parts contains a blood lubricity-imparting agent having a kinematic viscosity of 0.01 to 80 mm 2 /s at 40° C., a water hold percentage of 0.01 to 4.0 mass % and a weight average molecular weight of less than 1,000, and the amount of the blood lubricity-imparting agent in the pressure-bonded parts is larger than that in the excretory opening-contacting region.

First claim

The invention claimed is:

1. An absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet and an absorbent body between the top sheet and the back sheet,
wherein the absorbent body is subjected to embossing from a surface facing the back sheet of the absorbent body, a plurality of recesses are formed on the surface facing the back sheet and a dense/sparse structure is formed across an in-plane direction of the absorbent body, while the absorbent body is embossed together with the top sheet from a surface facing the top sheet of the absorbent body, the top sheet and the absorbent body are integrally compressed at a center section in a widthwise direction in an excretory opening contact region on the surface facing the top sheet, forming a plurality of pressure bonded sections where the entirety of the top sheet in a thickness direction introverts into the absorbent body, and the absorbent body and the top sheet are contacted at least in the excretory opening contact region on the surface facing the top sheet,
the pressure bonded sections extend in a lengthwise direction of the absorbent article and the pressure bonded sections are formed in a discontinuous manner at prescribed spacings in the lengthwise direction of the absorbent article and are formed in rows at prescribed spacings in a widthwise direction of the absorbent article, the recesses are formed on the surface facing the back sheet of the absorbent body below the pressure bonded sections, the excretory opening contact region of the top sheet and the pressure bonded sections each contains a blood slipping agent with a kinematic viscosity of 0.01 to 80 mm 2 /s at 40° C., a water holding percentage of 0.01 to 4.0 mass % and a weight-average molecular weight of less than 1,000, and the amount of blood slipping agent in the pressure bonded sections is greater than the amount of blood slipping agent in the excretory opening contact region.

2. The absorbent article according to claim 1 , wherein an embossed section is provided surrounding the excretory opening contact region, and the embossed section contains the blood slipping agent.

3. The absorbent article according to claim 1 , wherein the top sheet has a plurality of projections on a skin side surface of the top sheet, and a clothing side surface of the top sheet is flatter than the skin side surface of the top sheet.

4. The absorbent article according to claim 3 , wherein the top sheet has a gradually densifying structure from the skin side surface of the top sheet toward the clothing side surface of the top sheet.

5. The absorbent article according to claim 1 , wherein total ratio of an area of the recesses with respect to the surface facing the back sheet of the absorbent body is higher than total ratio of an area of the pressure bonded sections with respect to the surface facing the top sheet of the absorbent body.

6. The absorbent article according to claim 1 , wherein the recesses formed on the surface facing the back sheet of the absorbent body are dotted recesses.

7. The absorbent article according to claim 1 , wherein in the lengthwise direction and/or the widthwise direction, a pitch between the pressure bonded sections formed on the surface facing the top sheet is greater than a pitch between the recesses formed on the surface facing the back sheet of the absorbent body.

8. The absorbent article according to claim 1 , wherein total ratio of an area of the recesses with respect to the surface facing the back sheet of the absorbent body is 1 and 50%, a pitch between the recesses in the lengthwise direction is 3 to 10 mm, and a pitch in the widthwise direction is 3 to 10 mm.

9. The absorbent article according to claim 1 , wherein total ratio of an area of the pressure bonded sections with respect to the surface facing the top sheet of the absorbent body is 0.01 and 2.0%, an area of each of the pressure bonded sections is 1 to 20 mm 2 , a pitch between the pressure bonded sections in the lengthwise direction is 5 to 50 mm, and a pitch in the widthwise direction is 5 to 30 mm.

10. The absorbent article according to claim 1 , wherein the blood slipping agent has an IOB of 0.00 to 0.60.

11. The absorbent article according to claim 1 , wherein the blood slipping agent is selected from the group consisting of following items (i) to (iii), and any combination thereof:
(i) a hydrocarbon;
(ii) a compound having (ii-1) a hydrocarbon moiety and (ii-2) one or more, same or different groups selected from the group consisting of carbonyl group (—CO—) and oxy group (—O—) inserted between a C—C single bond of the hydrocarbon moiety; and
(iii) a compound having (iii-1) a hydrocarbon moiety, (iii-2) one or more, same or different groups selected from the group consisting of carbonyl group (—CO—) and oxy group (—O—), inserted between a C—C single bond of the hydrocarbon moiety, and (iii-3) one or more, same or different groups selected from the group consisting of carboxyl group (—COOH) and hydroxyl group (—OH), substituting a hydrogen on the hydrocarbon moiety;
with the proviso that when two or more oxy groups are inserted in the compound of (ii) or (iii), the oxy groups are not adjacent.

12. The absorbent article according to claim 1 , wherein the blood slipping agent is selected from the group consisting of following items (i′) to (iii′), and any combination thereof:
(i′) a hydrocarbon;
(ii′) a compound having (ii′-1) a hydrocarbon moiety, and (ii′-2) one or more, same or different bonds selected from the group consisting of carbonyl bond (—CO—), ester bond (—COO—), carbonate bond (—OCOO—), and ether bond (—O—) inserted between a C—C single bond of the hydrocarbon moiety; and
(iii′) a compound having (iii′-1) a hydrocarbon moiety, (iii′-2) one or more, same or different bonds selected from the group consisting of carbonyl bond (—CO—), ester bond (—COO—), carbonate bond (—OOCO—), and ether bond (—O—) inserted between a C—C single bond of the hydrocarbon moiety, and (iii′-3) one or more, same or different groups selected from the group consisting of carboxyl group (—COOH) and hydroxyl group (—OH) substituting a hydrogen on the hydrocarbon moiety;
with the proviso that when two or more same or different bonds are inserted in the compound of (ii′) or (iii′), the bonds are not adjacent.

13. The absorbent article according to claim 1 , wherein the blood slipping agent is selected from the group consisting of following items (A) to (F), as well as any combination thereof:
(A) an ester of (A1) a compound having a chain hydrocarbon moiety and 2-4 hydroxyl groups substituting hydrogens on the chain hydrocarbon moiety, and (A2) a compound having a chain hydrocarbon moiety and one carboxyl group substituting a hydrogen on the chain hydrocarbon moiety;
(B) an ether of (B1) a compound having a chain hydrocarbon moiety and 2-4 hydroxyl groups substituting hydrogens on the chain hydrocarbon moiety, and (B2) a compound having a chain hydrocarbon moiety and one hydroxyl group substituting a hydrogen on the chain hydrocarbon moiety;
(C) an ester of (C1) a carboxylic acid, hydroxy acid, alkoxy acid or oxoacid containing a chain hydrocarbon moiety and 2-4 carboxyl groups substituting hydrogens on the chain hydrocarbon moiety, and (C2) a compound having a chain hydrocarbon moiety and one hydroxyl group substituting a hydrogen on the chain hydrocarbon moiety;
(D) a compound having a chain hydrocarbon moiety, and one bond selected from the group consisting of ether bond (—O—), carbonyl bond (—CO—), ester bond (—COO—) and carbonate bond (—OCOO—), inserted between a C—C single bond of the chain hydrocarbon moiety;
(E) a polyoxy C 3 -C 6 alkylene glycol

Assignees

• Unicharm Corp

Inventors

• Hashino Akira
• Noda Yuki
• Tamura Tatsuya

Classifications

• A61F13/51108

  the top sheet having corrugations or embossments having one axis relatively longer than the other axis, e.g. forming channels or grooves in a longitudinal direction · CPC title

• A61F13/539 Primary

  characterised by the connection of the absorbent layers with each other or with the outer layers · CPC title

• A61F13/51113 Primary

  comprising an additive, e.g. lotion or odour control (A61F13/51108 takes precedence) · CPC title

• A61L15/50

  Lubricants; Anti-adhesive agents · CPC title

• A61F13/53436

  having an undulated or corrugated cross-section · CPC title