Disposable body fluids absorbent article

Details Disposable body fluids absorbent article Disposable body fluids absorbent article

1999-04-08

2001-11-27

Ruhl, Dennis (Department: 3761)

Surgery

Means and methods for collecting body fluids or waste material

Absorbent pad for external or internal application and...

C604S370000, C604S385010

Reexamination Certificate

active

06323387

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to body fluids absorbent articles such as disposable diapers, sanitary napkins and the like.
In such body fluids absorbent articles, it is well known to use discrete particles of a superabsorptive polymer as a component of the liquid-absorbent core. It is also well known that the discrete particles gelate and aggregate to form blocks.
The presence of the blocks prevent body fluids from transmitting and spreading within the absorbent core, resulting in deterioration of a body fluid absorbing capacity of the core, in spite of using the discrete particles. This tendency becomes more and more significant as a content of the discrete particles increases and/or an absorption rate increases.
SUMMARY OF THE INVENTION
In view of the above problem, it is an object of the invention to provide a body fluids absorbent article improved so that, even when the content of discrete particles of superabsorptive polymer in the core is relatively high and/or the absorption rate of the discrete particles is relatively high, the discrete particles can be utilized as efficiently as possible.
According to the present invention, there is provided a body fluids absorbent article including a liquid-pervious topsheet, a liquid-impervious backsheet and a liquid-absorbent core having a body-facing side and a garment-facing side and disposed therebetween the topsheet and the backsheet.
In the body fluids absorbent article, the core comprises 100~200 g/m
2
of fluff pulp, 20~45 g/m
2
of thermoplastic synthetic fibers and 120~400 g/m
2
of discrete particles of superabsorptive polymer; the fluff pulp and the synthetic fibers are present in an intermixed state so that their contents in the core gradually decrease from the body-facing side towards the garment-facing side in a thickness direction of the core; the discrete particles consists of 20~100 g/m
2
of first polymer particles presenting an initial water absorption rate V=40 or higher and 100~300 g/m
2
of second polymer particles presenting an initial water absorption rate V=5~20 wherein the initial water absorption rates are measured according to a measuring method described below; and a total amount of the first polymer particles is distributed in a lower zone adjacent the garment-facing side of the core thickness while 100~200 g/m
2
of the second polymer particles is distributed in an upper zone adjacent the body-facing side of the core and 0~100 g/m
2
of the second polymer particles is distributed in the lower zone of the core.
The initial water absorption rates (V) are measured by the following method:
(a) About 1 g of each polymer particles sample is put in a 250 mesh nylon cloth bag of 100 mm×200 mm and weighed. Thus a weight W
0
is obtained. This bag is immersed in an amount of 0.9% physiological saline solution poured into a 1 liter beaker;
(b) Bags taken out from the beaker in 10 seconds and 10 minutes of immersion, respectively, are suspended in midair for 10 minutes to drain. Thereafter these bags together with the contents are weighed and their weights W
1
, W
2
are obtained; and
(c) The initial water absorption rate V is calculated on the basis of an equation
V
={(
W
1
−W
0
)/(
W
2
−W
0
)}×100
Preferably, the first polymer particles are concentrated on a bottom of the core and in vicinity thereof so that the first polymer particles may swell and aggregate after water absorption to form gel blocks spreading over the bottom of the core.
Preferably, the core has a thickness of 0.7~7 mm.


REFERENCES:
patent: 4699823 (1987-10-01), Kellenberger et al.
patent: 5356403 (1994-10-01), Faulks et al.
patent: 5728082 (1998-03-01), Gustafsson et al.
patent: 5741241 (1998-04-01), Guidotti et al.
patent: 5800419 (1998-09-01), Soga et al.
patent: 0 558 889 A (1993-09-01), None
patent: 0 692 231 A (1996-01-01), None
patent: 2 627 080 A (1989-08-01), None

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