Absorbent products containing hydrogels with ability to swell against pressure
DC CAFCFirst Claim
1. An absorbent composite comprising a porous fiber matrix and an amount of superabsorbent material present in said porous fiber matrix, wherein said superabsorbent material can absorb at least 27 milliliters of an aqueous solution of sodium chloride containing 0.9 weight percent, sodium chloride, per gram of superabsorbent material while under a restraining pressure of at least 21,000 dynes per square centimeter, provided that, when said superabsorbent material is in the form of discrete particles, at least about 50%, by weight, of said superabsorbent material has a size greater than the median pore size of said porous fiber matrix when wet.
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Abstract
An absorbent composite of the type comprising a porous matrix of fibers and a superabsorbent material dispersed among the interfiber spaces (pores) wherein the superabsorbent material exhibits the ability to absorb greater than about 24 milliliters of a saline solution per gram of superabsorbent material under an applied restraining force of at least about 21,000 dynes/square centimeter provided that, when in the form of discrete particles, at least about 50% of said superabsorbent material has a size greater than the median pore size of the matrix when wet.
522 Citations
40 Claims
- 1. An absorbent composite comprising a porous fiber matrix and an amount of superabsorbent material present in said porous fiber matrix, wherein said superabsorbent material can absorb at least 27 milliliters of an aqueous solution of sodium chloride containing 0.9 weight percent, sodium chloride, per gram of superabsorbent material while under a restraining pressure of at least 21,000 dynes per square centimeter, provided that, when said superabsorbent material is in the form of discrete particles, at least about 50%, by weight, of said superabsorbent material has a size greater than the median pore size of said porous fiber matrix when wet.
- 14. An absorbent composite comprising a porous fiber matrix and an amount of superabsorbent material present in said porous fiber matrix, wherein said porous fiber matrix comprises at least about 3%, by weight, based on porous fiber matrix weight, of a synthetic polymeric fiber, and wherein said superabsorbent material can absorb at least about 24 milliliters of an aqueous solution of sodium chloride containing 0.9 weight percent, sodium chloride, per gram of superabsorbent material while under a restraining pressure of at least 21,000 dynes per square centimeter provided that, when said superabsorbent material is in the form of discrete particles, at least about 50%, by weight, of said superabsorbent material has a size greater than the median pore size of said porous fiber matrix when wet.
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20. A diaper, said diaper comprising:
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a liquid-permeable facing material; an absorbent composite adjacent said liquid-permeable facing material, said absorbent composite comprising a porous fiber matrix and an amount of a superabsorbent material present in said porous fiber matrix, wherein said superabsorbent material can absorb at least 27 milliliters of an aqueous solution of sodium chloride containing 0.9 weight percent sodium chloride, per gram of superabsorbent material while under a restraining pressure of at least 21,000 dynes per square centimeter, provided that, when said superabsorbent material is in the form of discrete particles, at least about 50%, by weight, of said superabsorbent material has a particle size greater than the median pore size of said porous fiber matrix when wet; and a liquid-impermeable backing material adjacent said absorbent composite and located opposite said liquid-permeable facing material. - View Dependent Claims (21, 23, 24, 35, 36)
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22. The diaper according to claim 22 wherein the absorbent composite has a density of from about 0.03 to about 0.4 grams per cubic centimeter.
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25. A diaper, said diaper comprising:
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a liquid-permeable facing material; an absorbent composite adjacent said liquid-permeable facing material, said absorbent composite comprising a porous fiber matrix and an amount of a superabsorbent material present in said porous fiber matrix, wherein said porous fiber matrix comprises at least about 3%, by weight, based on porous fiber matrix weight of a fiber formed from a synthetic polymeric material, and further wherein said superabsorbent material can absorb at least about 24 milliliters of an aqueous solution of sodium chloride containing 0.9 weight percent, sodium chloride, per gram of superabsorbent material while under a restraining pressure of at least 21,000 dynes per square centimeter provided that, when said superabsorbent material is in the form of discrete particles, at least about 50%, by weight, of said superabsorbent material has a size greater than the median pore size of said porous fiber matrix when wet. - View Dependent Claims (26, 27, 28, 29, 37, 38, 39)
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Specification