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Such polymerization conditions will generally involve a polymerization temperature of from about 20° C. Argon gas was blown into the aqueous phase to remove any dissolved oxygen. It should also be noted that the description set forth hereinbefore concerning the composition of the aqueous reaction mixture applies to the overall polymerization reaction mixture if a substantially single-phase aqueous solution polymerization is utilized but applies only to the aqueous phase of the overall reaction mixture if two-phase inverse suspension or inverse emulsion polymerization techniques are employed. After standing at 40° C. Biodegradable cross-linkers having a polyacid connected to reactive groups for cross-linking polymer filaments. Singly or as a result of a combination of these mechanisms, leaching of polymer into the body fluid to be absorbed can result in less efficient utilization of the hydrogel-forming polymer in the absorbent article and a greater incidence of undesirable leakage of body fluid from the article. It has now been discovered that hydrogel-forming polymer compositions of equal or better fluid absorbing performance characteristics vis-avis such prior art materials can be provided in the form of polymer compositions which are substantially free of graft polymerizable polymer moieties such as starch. Although the actual operating conditions used by current producers of SAP may vary, the patent literature teaches a broad range of temperature, concentrations, types of initiators and crosslinkers. As used herein the term "superabsorbent" refers to a material, natural or synthetic, capable of absorbing or gelling at least about 10 times its weight in liquid. U, obtained from Hoechst Celanese Corporation. Argon gas was blown into the flask to purge dissolved oxygen, and the temperature elevated to 65° C. Ref country code : IT Payment date : Year of fee payment : Water-absorbing polymers having interstitial compounds, a process for their production, and their use.

An absorbent article comprising: a a liquid impervious backing sheet;. AUA1 en. Method for making a crosslinkable aqueous solution which is useful to form soft, water-swellable polyacrylate articles. A second essential element of the hydrogel-forming polymer compositions herein is a cross-linking agent which serves to render the hydrogel-forming polymer compositions of this invention substantially water-insoluble and which in part serves to determine the gel volume, gel strength and extractable polymer content characteristics of the hydrogels formed from the polymer compositions herein. Field of the Invention This invention relates to improved absorbent composites containing hydrogel-forming polymers superabsorbents such as ionic hydrocolloids which, upon contacting fluids, such as body liquids urine , imbibe such liquids and thereby form hydrogels.

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By reacting the foregoing conventional monomer materials and cross-linking agents under certain reaction conditions, and preferably in a certain manner hereinafter described, it has been discovered that novel hydrogel-forming polymer compositions having especially desirable properties can be realized. A substantially water-insoluble, slightly cross-linked, partially neutralized, hydrogel-forming polymer composition consisting essentially of a from about 75 mole percent to Biomaterials 23 22 — Absorbent members for body fluids having good wet integrity and relatively high concentrations of hydrogel-forming absorbent polymer having high porosity. This example illustrates preparation of a polyacrylate hydrogel-forming material using an inverse suspension polymerization technique. J Biomed Mater Res A 77 4 — Absorbent article which includes superabsorbent material located in discrete pockets having an improved containment structure. J Appl Polym Sci 91 6 — 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. The absorbency of the supernatant from the synthetic urine suspension without Blue Dextrin should not exceed 0. As noted, hereinbefore, however, one type of non-acid comonomer which must not be present in the aqueous reaction mixture to any significant extent are monomers containing acid salt groups. This enables hydrogel-forming polymer in these more remote regions to contact the body fluid and thus contribute to the overall absorbent capacity of the article.

Cellulose-Based Hydrogel for Personal Hygiene Applications | SpringerLink

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• In its preferred form, the absorbent article 10 defines a generally hourglass shape having a pair of waist sections situated at opposed longitudinal ends of the article 10, a pair of opposed lateral sides extending between and interconnecting the ends and leg cut-outs along the sides.
• In one preferred embodiment of the hydrogel-forming polymer synthesis process herein, polymers of especially low extractable polymer content can be realized by utilizing in the aqueous reaction mixture no more than the minimum effective amount of initiator necessary to promote polymerization.

Personal hygiene product is an inseparable part of urban society. It has given comfort, reliability, and flexibility to sick people, 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 trend 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. Cellulose is the most abundant biocompatible matter on this earth which basically originated from plants. It is also naturally occurring long chain polymer that plays a vital role in food cycle in animal kingdom. Besides this cellulose, its derivatives have large application in various fields. As cellulose and its etherified and esterified derivatives have attractive physicochemical and mechanical properties, hydrogels synthesized from cellulose and its derivative can be alternative to synthetic superabsorbent polymer. Cellulose-based hydrogels have found application in various fields like agriculture, biomedical, tissue engineering, wound dressing, pharmaceuticals, etc. Among various applications, some products are available in the market, and some are in research level. Due to fast swelling and other extraordinary properties i. In this chapter, history of using superabsorbent in hygiene product, brief discussion on hydrogel synthesis, health and environment risk related to non-cellulosic absorbent materials, suitability of cellulose-based hydrogels over available acrylate hydrogels, and recommendation for development have been discussed. This is a preview of subscription content, log in via an institution. Book Google Scholar. Green Chem 8 5 — Article Google Scholar. Sannino A, Mensitieri G, Nicolais L Water and synthetic urine sorption capacity of cellulose based hydrogels under a compressive stress field.

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Pampers and tampons hydrogels. Cellulose-Based Hydrogel for Personal Hygiene Applications

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 pieluchy gemini prepared from unsaturated polymerizable, acid group-containing monomers and cross-linking agents. These hydrogel-forming polymer materials, upon imbibing fluids, form hydrogels. Such pampers and tampons hydrogels 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, pampers and tampons hydrogels, preferably using relatively low polymerization temperatures. Absorbent structures pampers and tampons hydrogels 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.

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A diaper article according to claim 33 wherein the absorbent core comprises an hourglass-shaped absorbent structure formed from an air-laid mixture of. Method for forming an absorbent structure having vertically orientated flow regulating walls. Patent 4, to Westerman U.