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Polyacrylic acid salt -based water-absorbent resin and a method for producing it. The hyrocolloid is a starch grafted crosslinked sodium salt of poly acrylic acid. Generally, from about 50 mole percent to The apparatus shown in Figures 5 and 6 is utilized for this test. Tyler, Inc. Such polymer materials furthermore have a relationship between gel volume, v, and equilibrium extractable polymer content, e, which is defined by the equation:. Patent 4,, to Tsubakimoto et al. USB2 en. VII Ex. Although primarily acrylic acid-based SAPs are disclosed in conjunction with the present invention, it should be understood that other types of SAP may be contemplated for use. The sample 68 to be tested is placed flat and smooth under an g cylinder plate assembly 70 such that the cylinder 72 which has a 5. Alternatively, the combination of hydrophilic fiber material and hydrogel-forming particles used as the absorbent structures herein can comprise a laminate containing at least one, and preferably two or more, layers of dispersed hydrogel-forming particles. Density values for these structures are calculated from basis weight and caliper. By altering the chemical character of the body fluid, extracted polymer causes fluid to become more poorly held by the hydrogel. J Appl Polym Sci 4 —

In yet another drying procedure the polymer-containing aqueous reaction mixture can be treated with a dewatering solvent such as methanol. The substantially water-insoluble, slightly cross-linked, partially neutralized, hydrogel-forming polymer materials of this invention are those which are prepared from polymerizable, unsaturated, acid-containing monomers. The diaper according to claim 20 wherein the absorbent composite comprises superabsorbent material in an amount of from about 5 to about 80 weight percent based on total weight of the absorbent composite. Diapers with these two polymer types have a significantly higher incidence of leakage and are furthermore not significantly preferred by mothers over the control diaper. Referring to figures 7 and 8, the absorbent structure is placed in a trough 40 with an included angle, alpha of 60°, such that all "runoff" is contained on the bodyside proximity of the absorbent structure using suitable dams 42 along the sample edges.

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Accordingly, the preferred superabsorbent materials will have an AUL of at least about 29 and the most preferred superabsorbent materials will have an AUL of at least about Absorbent composites were made according to Example III, using a hydrocolloid sold under the name Drytech , lot no. Ref country code : GB Payment date : Year of fee payment : Average value is believed to be more representative of the actual value. CAC en. The hydrogels swell and imbibe body fluids in the presence of hydrophilic functional groups in the polymeric backbone. An oscillating torque stress is applied torsionally to the conical element, and the resulting angular displacement of the cone is determined as a function of the applied torque. It was then left at 40° C. The powder forms a hydrogel having a shear modulus of 3. At this time the reaction mixture was heated at 40° C. Absorbent macrostructure made from mixtures of different hydrogel-forming absorbent polymers for improved fluid handling capability. The absorbent composite according to claim 5, wherein the composite comprises superabsorbent material in an amount of from about 10 to about 60 weight percent, based on total weight of the absorbent composite.

Hydrogels: a journey from diapers to gene delivery

• A diaper, said diaper comprising: a liquid-permeable facing material adapted to contact the skin of a wearer; 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 pampers and tampons hydrogels milliliters of an aqueous solution of sodium chloride containing 0.
• The resulting gel particles were kept at 40° C.
• DEA1 en.
• Harper et al; U.

Year of fee payment : 4. Year of fee payment : 8. Year of fee payment : Effective date : The present invention relates to improved hydrogel-forming polymer compositions which can be used as absorbents in absorbent structures and absorbent articles such as diapers, sanitary napkins and the like. Such hydrogel-forming polymer compositions are substantially water-insoluble, slightly cross-linked, partially neutralized polymers which are prepared from unsaturated polymerizable, acid group-containing monomers and cross-linking agents. These hydrogel-forming polymer materials, upon imbibing fluids, form hydrogels. Such polymer materials have relatively high gel volume and relatively high gel strength as measured by shear modulus of the hydrogen which forms therefrom. Such polymer materials also contain relatively low levels of extractable polymer material which can be extracted therefrom by contact with synthetic urine. Preferred hydrogel-forming polymers having these characteristics can be prepared by polymerizing the acid group-containing monomers in their free acid form at relatively low monomer concentrations, preferably using relatively low polymerization temperatures. Absorbent structures and absorbent articles containing these dried hydrogel-forming polymer materials are also disclosed. This application is a reissue of Ser. This invention relates to improved hydrogel-forming polymer compositions and to a process for their preparation. Such hydrogel-forming polymers are those which, upon contacting fluids i. These hydrogel-forming polymer materials are useful as absorbents in absorbent structures which can be incorporated into absorbent articles such as disposable diapers, adult incontinence pads, sanitary napkins and the like.

Personal hygiene product is an inseparable part of urban society. It has given comfort, reliability, and flexibility to sick people, women, and children, pampers and tampons hydrogels. The hygiene items containing superabsorbent polymer hydrogels for absorbing large amount of body fluids are the attractive inventions of modern science. The hydrogels swell and imbibe body fluids in the presence of hydrophilic functional groups in the polymeric backbone. Current trend of using acrylate-based superabsorbent in hygiene products is creating significant portion of urban garbage.

Pampers and tampons hydrogels. Hydrogels: a journey from diapers to gene delivery

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MAKING FERTILIZERS OUT OF DIAPERS!? (HYDROGEL)