Pampers and tampons hydrogels

The sample being tested is swollen to its gel volume in the same type of synthetic urine utilized in the gel volume determination. According to Figure 1, there is generally shown a disposable sanitary absorbent article 10, such as an infant diaper or adult incontinence garment, of the type having a liquid- impermeable backing material 12, a liquid- permeable facing material 14 and a liquid absorbent composite, generally indicated at 16, sandwiched therebetween. Disposable absorbent articles with masking topsheet having one or more openings providing a passageway to a void space. Absorbent composites were made by the method described in U. Absorbent polymer compositions having high sorption capacities under an applied pressure. Buying options Chapter EUR Google Scholar. The solution was stirred at 25° C. This aspect of the invention will be discussed in greater detail below in connection with Figures 2, 3 and 4. Four hundred and fifty parts of doubly distilled water, 92 parts of acrylic acid, and 0. The resulting rubbery particles were kept at 40° C. Where reported, these characteristics are determined using the following test methods:. Accessed 15 Oct Swish: Sustainable diaper cleaning system

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Accessed 25 Oct Cosmetics Development, manufacture and use of cosmetic materials, Kap. The hydrogels used in soft contact lenses, semi-permeable membranes and ion-exchange resins are not superabsorbent. Hydrogel-forming materials which essentially comprise only cross-linked polymerized unsaturated monomers, and no starch or cellulose moieties, are also known. The polymer is isolated in a swollen state by filtration and dried under reduced pressure at 80° C. 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. If the titrations are to be performed manually, great care must be taken to assure that equilibrium is reached after each addition of titrant. A porous plate 57 is used having ports 52 confined within the 2. This phenomenon is fully confirmed by the permeability tests discussed below, even though no significant differences in bulk change between composites having high vs. Haque, M.

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The sample is taken from granules which are pre-screened through U. For reasons of industrial hygiene, average particle sizes smaller than about 30 microns are less desirable. Positioned on top of the hourglass-shaped absorbent core is a liquid pervious topsheet The leg cut-outs may be further provided with elasticized gathers not shown for the purpose of conforming the intermediate crotch section of the diaper to the body of a wearer and also aiding in the prevention of lateral spillage of wastes outwardly from the sides onto outer clothing of a wearer. Gel strength of the hydrogels formed from the polymer materials herein is quantified by means of determining the shear modulus of a sample of the swollen hydrogel. This example illustrates a reverse suspension polymerization procedure wherein water is removed from the polymer by azeotropic distillation prior to neutralization of the polymer. Exactly 40 ml of filtrate is placed into a clean ml round-bottomed flask, and the solution is concentrated on a rotary evaporator water aspirator vacuum, bath temperature 55° C. Absorbent members having improved fluid distribution via low density and basis weight acquisition zones. Following neutralization, If extractable polymer content is to be measured as a function of time, then 1, 6 and 16 hour periods are sufficient to define the extractables versus time curve. In a preferred embodiment, the absorbent structures will comprise an intimate admixture of hydrophilic fiber material and hydrogel-forming particles with the hydrogel-forming particles being distributed, and preferably sustantially uniformly distributed, throughout a hydrophilic fiber matrix. A specified amount of synthetic urine e. High surface area material blends for odor reduction, articles utilizing such blends and methods of using same. It has also been found that gel strength, i.

Hydrogels: a journey from diapers to gene delivery

J Bioact Compat Polym 23 1 —
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An aliquot of this filtrate is then taken, and the free acid groups on the polymer material dissolved in this filtrate to pH 10 with base.
Particulate water-absorbing agent containing water-absorbent resin as a main component.

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.

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, pampers and tampons hydrogels, partially neutralized polymers which are prepared from unsaturated polymerizable, acid group-containing monomers and cross-linking agents.

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

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