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  Absorbent article comprising a primary aqueous-liquid-absorbing agentUSPTO Application #: 20070202772Title: Absorbent article comprising a primary aqueous-liquid-absorbing agent Abstract: An absorbent article comprising an absorbent core, which comprises at least one region comprising an aqueous-liquid-absorbing agent that contains water-absorbent resin particles, wherein the water-absorbent resin particles are obtained by a process including the step of polymerizing a water-soluble ethylenically unsaturated monomer having a carboxyl group, in the presence of an internal-crosslinking agent having at least four functional groups each capable of forming a covalent bond with a carboxyl group to thereby obtain a hydropolymer that is internally cross-linked and surface-crosslinked, the aqueous-liquid-absorbing agent being characterized by exhibiting a water absorption capacity (CRC) of 5 to 25 g/g and a saline flow conductivity (SFC) of not less than 1216 cm3·s·10-7/g. (end of abstract) Agent: The Procter & Gamble Company Intellectual Property Division - West Bldg. - Cincinnati, OH, US Inventors: Hiroyuki Ikeuchi, Shigeru Sakamoto, Syaka Machida, Yasue Nakagawa, Holger Beruda USPTO Applicaton #: 20070202772 - Class: 442417 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20070202772. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF THE INVENTION [0001]The present invention relates to an absorbent article, such as a diaper or adult incontinence article or sanitary napkin, comprising a primary aqueous-liquid-absorbing agent comprising resin particles obtained by a process including the step of polymerizing a water-soluble ethylenically unsaturated monomer having a carboxyl group, in the presence of an internal-crosslinking agent having at least four functional groups each capable of forming a covalent bond with a carboxyl group, the aqueous-liquid-absorbing agent being characterized by exhibiting a water absorption capacity (CRC) of 5 to 25 g/g and a saline flow conductivity (SFC) of not less than 1216 cm3s10-7/g. BACKGROUND OF THE INVENTION [0002]There have been continuous investigations to provide improved absorbent article with so-called super-absorbing resins or material or water-absorbing material or water-gelling material. Typically such articles need to that have a high absorption rate, absorption amount, and retention for aqueous liquids and therefore the prior art water-absorbing resins are typically being mixed with or used in addition to fibrous materials such as cellulose fiber, polyester fiber, polyethylene fiber, and/or polypropylene fiber. [0003]In recent years, the ratios of the water-absorbing resins to fibrous material in the absorbent articles tend to increase with the increasing needs of the thinning of the sanitary materials such as diapers. For realization of thinner sanitary materials, it is desired that the fiber materials are replaced with water-absorbent resins for further increase in ratio of the water-absorbent resins in the absorbent structures. [0004]The water-absorbent resin is inherently excellent in the performances of absorbing and retaining the aqueous liquid. However, the fibrous materials are poor in these performances, particularly the performance of retaining the aqueous liquid, and have different performances from those of the conventional water-absorbent resin. As such, as a future water-absorbent resin that responds to the needs, water-absorbent resins having the performances of the fibrous materials in the conventional absorbent structures must be developed. Examples of the performances demanded to such a water-absorbent resin having the performances of the fibrous materials include: a performance of rapidly absorbing an aqueous liquid; a performance of diffusing the aqueous liquid after having absorbed it; and a performance of being capable of temporarily retaining the aqueous liquid after having absorbed it. Therefore, the development of water-absorbent resins having these performances has been desired. [0005]The present invention provides absorbent articles comprising such an improved water-absorbent resin or aqueous-liquid-absorbing agent, which can be made much thinner or more flexible than conventional absorbent articles, because the aqueous-liquid-absorbing agent has the performances of traditionally used fibrous materials, i.e., the performance of rapidly absorbing an aqueous liquid; the performance of diffusing the aqueous liquid after having absorbed it; and the performance of being capable of temporarily retaining the aqueous liquid after having absorbed it. SUMMARY OF THE INVENTION [0006]The present invention relates to an absorbent article comprising an absorbent core, which comprises a primary aqueous-liquid-absorbing agent that contains water-absorbent resin particles, wherein the water-absorbent resin particles are obtained by a process including the step of polymerizing a water-soluble ethylenically unsaturated monomer having a carboxyl group, said resin particles being internally cross-linked and surface-crosslinked, whereby the primary aqueous-liquid-absorbing agent is characterized by exhibiting a water absorption capacity (CRC) of 5 to 25 g/g and a saline flow conductivity (SFC) of not less than 1216 cm3s10-7/g, and preferably having an absorption rate (FSR) of not less than 0.1 g/g/s and/or preferably having a wet porosity of not less than 20%. [0007]The absorbent article is preferably a disposable absorbent article, preferably selected from sanitary napkins, panty-liners, adult incontinence articles and diapers, including training or pull-up pants. [0008]The absorbent article preferably comprises a topsheet, backsheet and therein between an absorbent core, that may comprise an acquisition storage layer, in contact with the topsheet, and there underneath a storage layer, and optionally more absorbent layers, where one of the layers comprises the primary aqueous-liquid-absorbing agent herein, said layer comprising less than 10% by weight (of the primary aqueous-liquid-absorbing agent) of cellulose fibers (including modified cellulose fibers such as chemically or mechanically modified cellulose fibers). [0009]The absorbent core preferably also comprises a secondary aqueous-liquid absorbing agent, having a SFC of less than 600 cm3s10-7/g, which may comprise in the same or a different layer of the absorbent core to the primary aqueous-liquid-absorbing agent, whereby one or more or all of the layers of the care are preferably substantially free of cellulose-type fibers, e.g., comprising each less than 10% by weight (by weight of all (i.e., primary or secondary) liquid-absorbing agents present in said layer) of cellulose fibers. [0010]The disposable absorbent article herein are preferably very thin, having preferably a maximum dry caliper in the crotch region (as measured herein) of 4.5 mm or less. [0011]The disposable absorbent articles herein comprise preferably an absorbent core comprising at least said primary aqueous-liquid-absorbing agent and optionally said secondary aqueous-liquid-absorbing agent, and said core having one or more regions with an average density greater than about 0.2 g/cm.sup.3, or said core as a whole having such a density. BRIEF DESCRIPTION OF THE DRAWINGS [0012]FIG. 1: A schematic sectional view of a measurement apparatus as used for measuring the AAP. [0013]FIG. 2: A schematic sectional view of a measurement apparatus as used for measuring the SFC. [0014]FIG. 3: A schematic sectional view of a portion of the measurement apparatus as used for measuring the SFC. [0015]FIG. 4: A bottom view of a piston head of the measurement apparatus as used for measuring the SFC. DETAILED DESCRIPTION OF THE INVENTION Absorbent Articles [0016]Absorbent article" refers to devices that absorb and contain liquid, and more specifically, refers to devices that are placed against or in proximity to the body of the wearer to absorb and contain the various exudates discharged from the body. Absorbent articles include but are not limited to diapers (adult and infant; including training pants), adult incontinence briefs, diaper holders and liners, sanitary napkins, panty-liners and tampons. [0017]Diaper" refers to an absorbent article generally worn by infants and incontinent persons about the lower torso. [0018]Disposable" is used herein to describe articles that are generally not intended to be laundered or otherwise restored or reused (i.e., they are intended to be discarded after a single use and, preferably, to be recycled, composted or otherwise disposed of in an environmentally compatible manner). Continue reading... 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