Absorbent article

Patent metadata

Field	Value
Publication number	US-9387135-B2
Application number	US-201314381952-A
Country	US
Kind code	B2
Filing date	Feb 25, 2013
Priority date	Feb 29, 2012
Publication date	Jul 12, 2016
Grant date	Jul 12, 2016

Abstract

The present invention addresses the problem of providing a novel absorbent article that prevents excessive compression of an absorbent body caused by deformation of the absorbent article, and rewetting associated with said compression. In order to solve such a problem, a sanitary napkin ( 1 ) is provided with a liquid-permeable top sheet ( 2 ), a liquid-impermeable back sheet ( 3 ), and an absorbent body ( 4 ) disposed between the top sheet ( 2 ) and the back sheet ( 3 ), wherein: an extensible area ( 21 ) having an extensible bellows-like section ( 210 ), and a flexible area ( 22 ) surrounding the extensible area ( 21 ) are formed in a waste supply area ( 20 ) of the top sheet ( 2 ).

First claim

The invention claimed is:

1. An absorbent article, comprising:
a liquid-permeable sheet, a liquid-impermeable sheet and an absorbent body provided between the liquid-permeable sheet and the liquid-impermeable sheet,
wherein
the liquid-permeable sheet has
an extensible region having an extendable bellows structure, and
a flexible region encompassing the extensible region,

the extensible region and the flexible region overlap the absorbent body and are formed in a liquid-receiving region adapted to receive a liquid supplied to the liquid-permeable sheet,
a liquid permeation hole is formed in the extensible region, and no liquid permeation hole is formed in the flexible region,
the extendable bellows structure has mountain and valley folds laid out in a lengthwise direction of the absorbent article and aligned in a widthwise direction of the absorbent article,
the liquid permeation hole is formed in a side section of the extendable bellows structure, said side section connecting an uppermost section of one of the mountain folds and a lowermost section of an adjacent one of the valley folds,
wherein the liquid permeation hole is spaced away from the uppermost section of said one of the mountain folds and the lowermost section of said adjacent one of the valley folds,
wherein the flexible region is in plane with the uppermost section of said one of the mountain folds, and
wherein the liquid permeable sheet comprises a blood modifying agent with an IOB of 0.00-0.60, a melting point of 45° C. or less, and a water solubility of 0.00-0.05 g in 100 g of water at 25° C.

2. The absorbent article according to claim 1 , wherein
the liquid-permeable sheet has a plurality of extensible regions in the liquid-receiving region and including said extensible region, each of the extensible regions having an extendable bellows structure, and
the flexible region encompasses each of the extensible regions.

3. The absorbent article according to claim 2 , wherein
the flexible region is formed in a net-shaped pattern, and
each of the extensible regions is formed inside a mesh unit of the net-shaped pattern.

4. The absorbent article according to claim 3 , wherein the flexible region has
roughly linear first regions laid out in a direction crossing a lengthwise direction of the absorbent article and aligned in an approximately parallel manner, and
roughly linear second regions laid out in a direction crossing the first regions and aligned in an approximately parallel manner.

5. The absorbent article according to claim 1 , wherein a compressed groove is formed on a perimeter of the liquid-receiving region.

6. The absorbent article according to claim 1 , wherein the blood modifying agent is selected from the group consisting of following items (i)-(iii) and combinations 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) substituted for a hydrogen of the hydrocarbon moiety;
with the proviso that when 2 or more oxy groups are inserted in the compound of (ii) or (iii), the oxy groups are not adjacent.

7. The absorbent article according to claim 1 , wherein the blood modifying agent is selected from the group consisting of following items (i′)-(iii') and combinations 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 (—OCOO—), 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) substituted for a hydrogen on the hydrocarbon moiety;
with the proviso that when 2 or more same or different bonds are inserted in a compound of (ii') or (iii'), the bonds are not adjacent.

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

9. The absorbent article according to claim 1 , wherein the blood modifying agent is selected from the group consisting of (a 1 ) an ester of a chain hydrocarbon tetraol and at least one fatty acid, (a 2 ) an ester of a chain hydrocarbon triol and at least one fatty acid, (a 3 ) an ester of a chain hydrocarbon diol and at least one fatty acid, (b 1 ) an ether of a chain hydrocarbon tetraol and at least one aliphatic monohydric alcohol, (b 2 ) an ether of a chain hydrocarbon triol and at least one aliphatic monohydric alcohol, (b 3 ) an ether of a chain hydrocarbon diol and at least one aliphatic monohydric alcohol, (c 1 ) an ester of a chain hydrocarbon tetracarboxylic acid, hydroxy acid, alkoxy acid or oxoacid with 4 carboxyl groups, and at least one aliphatic monohydric alcohol, (c 2 ) an ester of a chain hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid or oxoacid with 3 carboxyl groups, and at least one aliphatic monohydric alcohol, (c 3 ) an ester of a chain hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid or oxoacid with 2 carboxyl groups, and at least one aliphatic monohydric alcohol, (d i ) an ether of an aliphatic monohydric alcohol and an aliphatic monohydric alcohol, (d 2 ) a dialkyl ketone, (d 3 ) an ester of a fatty acid and an aliphatic monohydric alcohol, (d 4 ) a dialkyl carbonate, (e 1 ) a polyoxy C 2 -C 6 alkylene glycol, (e 2 ) an ester of a polyoxy C 2 -C 6 alkylene glycols and at least one fatty acid, (e 3 ) an ether of a polyoxy C 2 -C 6 alkylene glycol and at least one aliphatic monohydric alcohol, (e 4 ) an ester of a

Assignees

• Unicharm Corp

Inventors

• Noda Yuki
• Tamura Tatsuya
• Nomoto Takashi
• Onozuka Takashi

Classifications

• A61F13/533

  having discontinuous areas of compression · CPC title

• A61F13/472

  specially adapted for female use · CPC title

• A61F13/47218

  with a raised crotch region, e.g. hump · CPC title

• A61F2013/51186

  specially shaped topsheets · CPC title

• A61F2013/5128

  characterized by open targets or acquisitions or vulnerability zones · CPC title