US 5,395,359 AGranted

Absorbent article

AssigneeKao Corporation

InventorsMinoru Nakanishi, Satoshi Yamamoto, Mitsugu Hamajima, Yukimitsu Koseki

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Abstract

An absorbent article which comprises an absorbent element which at least partially comprises an absorbent sheet A prepared by applying a pressure-sensitive adhesive 3 having a suitable adhesive power to an absorbent material 1 having a suitable liquid-absorbent (or retentive) power in the form of dot, line or curve (spiral curve or the like) with the pressure-sensitive adhesive in a suitable density; spreading an absorbent polymer 2 thereon; putting another sheet of the absorbent material 1 thereon, and compressing the assemblage into a composite structure. In the course of the absorption of a liquid, the liquid is first stocked in the absorbent material having a high initial absorption velocity, and is gradually transferred to the absorbent polymer by capillary power as the driving force and absorbed therein, while the absorbent polymer is prevented from falling off from the absorbent material by the pressure-sensitive adhesive, whereby the properties of the absorbent polymer can be exhibited to the fullest.

Claims14

Dependent claims

An absorbent sheet used for part or all of the absorbent element in an absorbent article comprising

(1) a liquid permeable layer,
(2) a liquid-retentive absorbent sheet, and
(3) a liquid impermeable anti-leakage material wherein said liquid-retentive absorbent sheet is disposed between said liquid permeable layer and said liquid-impermeable anti-leakage material, said absorbent sheet comprising
(a) a first layer of absorbent material having liquid absorbency,
(b) a second layer of absorbent material having liquid absorbency, and
(c) an absorbent polymer fixed to said first layer of said absorbent material and said second layer of said absorbent material with a hot melt adhesive in the form of at least one dot, at least one line, or at least one curved line disposed between said first layer of said absorbent material and said second layer of said absorbent material, wherein said absorbent polymer has a liquid absorbency different from that of said absorbent material, and wherein said difference in said liquid absorbency between said absorbent polymer and said absorbent material being sufficient so that liquid, once absorbed in said absorbent material, will smoothly migrate to said absorbent polymer,
wherein a size of said dot is 0.1 to 10 mm in diameter, said line or curve line is 0.05 to 5 mm in width and a width of a part to which said adhesive is not applied between said lines is 0.05 to 10 mm, and
a part to which the adhesive is not applied exists in a circle of 10 to 30 mm in diameter.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/127,122Filed 27 Sep 1993 · continuation
Priority: JP 3-02571425 Jan 1991
Granted: 7 Mar 1995
Term ends: Not estimatedThe source records don’t support an estimate.

Classification25 codes

B32B 5/26
One layer being a fibrous or filamentary layer: another layer next to it also being fibrous or filamentary
A61F 13/534
Characterised by the absorbing medium: having an inhomogeneous composition through the thickness of the pad
A61F 13/539
Characterised by the absorbing medium: characterised by the connection of the absorbent layers with each other or with the outer layers
B32B 5/022
Characterised by structural features of a fibrous or filamentary layer: non-woven fabric