Absorbent members for body fluids having good wet integrity and relatively high concentrations of hydrogel-forming absorbent polymer having high porosity
First Claim
1. An absorbent member for the containment of aqueous body fluids, which comprises at least one region comprising hydrogel-forming absorbent polymer in a concentration of from about 60 to 100% by weight, said hydrogel-forming polymer providing a gel continuous fluid transportation zone when in a swollen state and having:
- (a) a porosity of at least about 0.15;
(b) a Performance under Pressure (PUP) capacity value of at least about 23 g/g under a confining pressure of 0.7 psi (5 kPa);
(c) a basis weight of at least about 10 gsm;
said region having, when subjected to normal use conditions, sufficient wet integrity such that said gel continuous zone substantially maintains its ability to acquire and transport said body fluids through said gel continuous zone.
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Accused Products
Abstract
Absorbent members useful in the containment of body fluids such as urine, that have at least one region containing hydrogel-forming absorbent polymer in a concentration of from about 60 to 100% by weight and providing a gel-continuous fluid transportation zone when in a swollen state. This hydrogel-forming absorbent polymer has: (a) a porosity of at least about 0.15; (b) a Performance under Pressure (PUP) capacity value of at least about 23 g/g under a confining pressure of 0.7 psi (5 kPa); (c) a basis weight of at least about 10 gsm; and (d) optionally, but preferably, a Saline Flow Conductivity (SFC) value of at least about 30×10-7 cm3 sec/g. In addition, the region where this hydrogel-forming absorbent polymer is present has, even when subjected to normal use conditions, sufficient wet integrity such that the gel-continuous zone substantially maintains its ability to acquire and transport body fluids through the gel-continuous zone.
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Citations
45 Claims
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1. An absorbent member for the containment of aqueous body fluids, which comprises at least one region comprising hydrogel-forming absorbent polymer in a concentration of from about 60 to 100% by weight, said hydrogel-forming polymer providing a gel continuous fluid transportation zone when in a swollen state and having:
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(a) a porosity of at least about 0.15; (b) a Performance under Pressure (PUP) capacity value of at least about 23 g/g under a confining pressure of 0.7 psi (5 kPa); (c) a basis weight of at least about 10 gsm; said region having, when subjected to normal use conditions, sufficient wet integrity such that said gel continuous zone substantially maintains its ability to acquire and transport said body fluids through said gel continuous zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. An absorbent core for acquiring, distributing and storing body fluids, which comprises a fluid storage absorbent layer comprising fibrous matrix having at least one region containing particles of a surface crosslinked hydrogel-forming absorbent polymer having carboxy functional groups, said hydrogel-forming polymer being present in said region in a concentration of from about 60 to 100% by weight, said hydrogel-forming polymer providing a gel continuous fluid transportation zone when in a swollen state and having:
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(a) a porosity of from about 0.15 to about 0.40; (b) a Performance under Pressure (PUP) capacity value of at least about 23 g/g under a confining pressure of 0.7 psi (5 kPa); (c) a basis weight of at least about 20 gsm; (d) a Saline Flow Conductivity (SFC) value of from about 30 to about 1000×
10-7 cm3 sec/g;(e) about 15% or less extractable polymer; (f) a gel volume of from about 25 to about 80 g/g; said region having, when subjected to normal use conditions, sufficient wet integrity such that said gel continuous zone substantially maintains its ability to acquire and transport body fluids through said gel continuous zone. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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Specification