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Absorbent materials having improved absorbent property and methods for making the same. Within 17 minutes, the reaction temperature had increased to 65° C. For sulfonic acid-based hydrogel-forming polymers, a gravimetric procedure is employed. ARIN et al. It has also been discovered that a "preferred" class of hydrogel-forming polymers are those which exhibit a particular relationship between gel volume and equilibrium extractable polymer content. For example, the matrix may comprise at least about 5 weight percent preferably about 10 weight percent synthetic polymer fibers and the remainder may comprise wood pulp fluff. As a general rule, superabsorbent materials having an AUL of at least about 24 and beneficially at least 27 will be able to perform the amount of work necessary to overcome the restraining forces typically applied when the composites of the present invention are incorporated into the personal care products such as diapers, incontinence garments, sanitary napkins and the like. It has furthermore been discovered that the particular combination of gel volume. The solution was then vigorously stirred and cooled to 11° C. Process for the production of highly water-absorbing but less water-soluble hydrogels. Four hundred and fifty parts of doubly distilled water, 92 parts of acrylic acid, and 0. ACS Symp Ser 7 — Accessed 25 Oct Cosmetics Development, manufacture and use of cosmetic materials, Kap.

Significantly, the rate of uptake on the fourth fluid insult closely resembled the rate for the first insult for absorbent composites containing high AUL hydrocolloids. Swelling substance fixed to sheet - by first mixing it with thermoplastics powder then applying and heating. The hydrogel formed from the powder had a shear modulus of 1. J Bioact Compat Polym 23 1 — In such a procedure an azeotrope-forming solvent such as cyclohexane is combined with the gelled mass of polymer material, and the temperature of the resulting mixture is maintained at or above the boiling point of the resulting azeotrope. The amount of fluid being wicked through the composite 22 is determined with an electro-­ balance More preferably, gel volume, v, and shear modulus, s, of hydrogels formed from this "especially preferred" class of polymers will be defined by the equation:.

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Production method and method for enhancing liquid permeability of water-absorbing resin. Arakawa Chemical Industries, Ltd. These absorption characteristics of such materials make them especially useful for incorporation into absorbent articles such as disposable diapers. Hydrolyzed crosslinked kappa-carrageenan- g -PAAm as a novel smart superabsorbent hydrogel with low salt sensitivity. The results shown in Figure 20 indicate that the rate of fluid uptake increased, even with increased hydrocolloid particle concentration, for those examples having composites containing relatively higher AUL hydrocolloids. IV Ex. An absorbent structure according to claim 24 wherein, for the hydrogel-forming polymer particles, the relationship between gel volume, v, and equilibrium extractable. To the quickly stirred solution cooled to 14° C. The first step in the process for preparing the preferred. Particle Size Distr. Alkali metal acrylate or ammonium acrylate polymer excellent in salt solution-absorbency and process for producing same. Sorry, a shareable link is not currently available for this article.

Hydrogels: a journey from diapers to gene delivery

• Gel volume in terms of grams of synthetic urine absorbed per gram of hydrogel-forming polymer is determined by swelling the polymer samples in several aliquots of synthetic urine.
• These ratios may range from about to about
• Water absorbent resin particles of crosslinked carboxyl-containing polymers with low monomer content.
• Such hydrogel-forming polymer particles can be utilized as absorbents in absorbent structures and articles as hereinafter more fully described.
• Two checks can be made to insure the accuracy of the instantaneous final readout.

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. Water-insoluble hydrogel-forming polymers are materials which are capable of absorbing large quantities of fluids such as water and body waste and which are further capable of retaining such absorbed fluids under moderate pressures. These absorption characteristics of such materials make them especially useful for incorporation into absorbent articles such as disposable diapers. Harper et al; U. These polymers are rendered water-insoluble by cross-linking the carboxyl group-containing polymer chains using conventional cross-linking agents such as di- or poly-functional monomer materials.

Personal hygiene product is an inseparable part of urban society. It has given comfort, reliability, and flexibility to sick people, pampers and tampons hydrogels, women, and children. 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 pampers and tampons hydrogels of using acrylate-based superabsorbent in hygiene products is creating significant portion of urban garbage. This pile up is not only shrinking land sites but also harming a lot to the environment due to non-degradability of superabsorbent materials existing in the core of hygiene product. In spite of high water-holding capacity of petrochemical-based superabsorbent polymer, it has a hidden curse on nature of non-degradability and health risk.

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

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The matrix may also be formed from a mixture of wood pulp fluff and the meltblown fibers discussed above, pampers and tampons hydrogels. Thermoplastic absorbent material having increased absorption and retention capacity for proteinaceous or serous body fluids. The gel was chopped thoroughly until it had imbibed all of the surrounding fluid and was kept at 40° C.

Girls when they see pad or tampon commercials