Absorbent members for body fluids using hydrogel-forming absorbent polymer
AssigneeThe Procter & Gamble Company
InventorsJohn Collins Dyer, Stephen Allen Goldman, Herbert Louis Retzsch
Life of this patent
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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 50 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 Dynamic Gelling Rate of at least about 0.18 g/g/sec; (b) a Performance under Pressure (PUP) capacity value of at least about 25 g/g under a confining pressure of 0.7 psi (5 kPa); and (c) when the hydrogel-forming absorbent polymer is in the form of particles, a mass median particle size of at least about 100 μm.
Claims51
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 50 to 100% by weight, said hydrogel-forming absorbent polymer having:
- (a) a Performance under Pressure (PUP) capacity value of at least 25 g/g under a confining pressure of 0.7 psi (5 kPa);
- (b) a Dynamic Gelling Rate (DGR) value of at least 0.18 g/g/sec;
- and
- (c) when the hydrogel-forming absorbent polymer is in the form of particles, a mass median particle size of at least 100 μm.
The absorbent article of claim 26 which is a diaper.
The absorbent article of claim 26 which is a catamenial pad.
The absorbent article of claim 26 which is a wound bandage.
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 50 to 100% by weight, said hydrogel-forming absorbent polymer having:
- (a) a Performance under Pressure (PUP) capacity value of at least about 29 g/g under a confining pressure of 0.7 psi (5 kPa);
- (b) a Dynamic Gelling Rate (DGR) value of at least about 0.25 g/g/sec;
- and
- (c) when the hydrogel-forming absorbent polymer is in the form of particles, the mass median particle size is from about 300 to about 800 μm.
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 absorbent polymer being present in said region in a concentration of from about 50 to 100% by weight, said hydrogel-forming absorbent polymer providing a gel continuous fluid transportation zone when in a swollen state and having:
- (a) a Performance under Pressure (PUP) capacity value of at least about 25 g/g under a confining pressure of 0.7 psi (5 kPa);
- (b) a Dynamic Gelling Rate (DGR) value of at least about 0.18 g/g/sec;
- (c) when the hydrogel-forming absorbent polymer is in the form of particles, the mass median particle size is at least about 100 μm;
- (d) a Saline Flow Conductivity (SFC) value of from about 30 to about 1000×10−7 cm3sec/g;
- (e) about 15% or less extractable polymer material;
- and
- (f) a gel volume of from about 25 to about 100 g/g.
Dependencies are inferred from the claim text.