Suitable salt-forming cations include alkali metal, ammonium, substituted ammonium and amines. The amount of fluid 98 passing through the sample was collected in a pan resting on an electro balance connected to a strip chart recorder Positioned on top of the hourglass-shaped absorbent core is a liquid pervious topsheet Transport of body fluid via processes such as wicking is an important performance feature of many absorbent articles. This example illustrates preparation of a polyacrylate hydrogel-forming material using an inverse suspension polymerization technique. Water-absorbent resin composition, method of manufacturing the same, and absorbent article. A hydrogel-forming polymer composition according to claim 2 wherein a said acid-group containing monomers are selected from acrylic acid, methacrylic acid, and 2-acrylamidomethylpropane sulfonic acid, and combinations thereof; and. Any type of hydrophilic fiber which is suitable for use in conventional absorbent products is also suitable for use in the absorbent structures herein. More preferably, the cross-linking agent will comprise from about 0. The density, for the purpose of this application, is measured under a load of 0. Following complete addition, the contents of the flask are allowed to stir for 20 minutes before the swollen polymer was isolated by filtration, allowed to stand overnight and then dried under reduced pressure at 80° C. As noted, the hydrogel-forming polymer compositions hereinbefore described, whether broadly defined or defined as "preferred". Some characteristics of the polymer were determined as an average of several runs. J Appl Polym Sci 24 4 — Gel volume is determined by forming a suspension of about 0.
The test results in Figure 21 further show that those Examples using higher AUL hydrocolloids perform a greater amount of work producing a more open structure, resulting in greater wicking rates, than the lower AUL Examples. Triggerable delivery system for pharmaceutical and nutritional compounds and methods of utilizing same. The optical absorbency ABS of each supernatant is determined spectrophotometrically with an accuracy of 0. In a cooled flask, This is a preview of subscription content, log in via an institution.
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It has further been discovered that the ability to rapidly imbibe multiple fluid surges spaced in time from one another significantly improves the performance of the composite 16 when incorporated into a diaper. In yet another drying procedure the polymer-containing aqueous reaction mixture can be treated with a dewatering solvent such as methanol. AUA en. Absorbent composites were made in accordance with the method of Examples I and II, using a hydrocolloid obtained from the Dow Chemical Company under the designation Drytech , lot no. USB1 en. Superabsorbent polymer hereinafter referred to as SAP and superabsorbent material are not technical terms. This particular combination of characteristics renders these hydrogel-forming polymers, when neutralized to a particular extent, especially useful as absorbents in absorbent structures and articles. Process for the preparation of a mixture of cellulose and granulated polymer. It has given comfort, reliability, and flexibility to sick people, women, and children. Although prior art superabsorbent materials and absorbent composites made therewith have favorably exhibited the ability to freely swell with fluid and retain such fluid against an applied pressure, the benefits of this characteristic are, to an extent, illusory. The absorbent composite according to claim 1, wherein the superabsorbent material is in the form of discrete particles. The density of the absorbent structures herein will generally be in the range of from about 0. Biodegradable cross-linkers having a polyacid connected to reactive groups for cross-linking polymer filaments. Eur J Pharm Biopharm 76 3 —
Hydrogels: a journey from diapers to gene delivery
- In this manner an open capillary structure is maintained even when the superabsorbent is in a swollen state.
- Absorbent structures of this type can be formed by air-laying a dry mixture of hydrophilic fibers and hydrogel-forming particles and, if desired or necessary, densifying the resulting web.
- The gel was chopped thoroughly until it had imbibed all of the surrounding fluid and was kept at 40° C.
- Thus, this example illustrates the importance of utilizing acid form monomer at relatively low concentration if "preferred" hydrogel-forming material of especially low extractables is to be realized.
- J Appl Polym Sci 4 —
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.
Year of fee payment : 4. Year of fee payment : 8. Year of fee payment : Effective date : The present invention relates to improved pampers and tampons hydrogels 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, pampers and tampons hydrogels, 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.
Pampers and tampons hydrogels. Cellulose-Based Hydrogel for Personal Hygiene Applications
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Biomacromolecules 7 3 — Such materials are described, for example, in Tsubakimoto et al; U.
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