Preferred classes of polymer materials of this type are those having particular relationships a between gel volume and equilibrium extractable polymer content. 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. Accessed 10 Nov Thus, it has furthermore been discovered that an element heretofore thought to be essential to the realization of exceptionally desirable hydrogel absorption performance can be eliminated while nevertheless providing hydrogel-forming polymer materials which are especially useful in absorbent articles. Patent 4,, to Login et al. A portion of this gel In another preferred embodiment of the present invention, the porous fiber matrix comprises at least about 3 percent and preferably 5 percent, by weight, of a synthetic polymeric fiber and the remainder of the matrix is formed from cellulosic material. J Adv Res 6 2 — The superabsorbent material need not be discrete particles as illustrated, but could take the form of continuous or discontinuous fibers. This invention relates to improved hydrogel-forming polymer compositions and to a process for their preparation. Provided by the Springer Nature SharedIt content-sharing initiative. Superabsorbent carboxyl-containing polymers with odor control properties and method for preparation.
A truncated conical upper element having the same projected surface area as the area of the lower circular plate is positioned above the circular lower plate. A soldering iron can be utilized to touch up the seal if unsuccessful or it breaks. In another preferred embodiment of the present invention, the porous fiber matrix comprises at least about 3 percent and preferably 5 percent, by weight, of a synthetic polymeric fiber and the remainder of the matrix is formed from cellulosic material. The density, for the purpose of this application, is measured under a load of 0. Absorbent articles herein will in general comprise a liquid impervious backing sheet, a liquid pervious, relatively hydrophobic topsheet and an absorbent core comprising the absorbent structure of the present invention positioned between said backing sheet and said topsheet. Organic-soluble free radical initiators are usually employed.
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EP-A,; published Oct. Download references. While maintaining external cooling at 6° C. Patent 4,, to Kellenberger et al. Combinations of these drying procedures may also be utilized. Of all of these types of cross-linking agents, the most preferred for use herein are the di- or poly-esters of unsaturated mono- or polycarboxylic acids with polyols, the bisacrylamides and the di- or triallyl amines. A more detailed description of sanitary napkins and suitable materials for use therein is found in Duncan and Smith, U. J Biomed Mater Res A 80 1 — In one preferred embodiment of the present invention, the porous fiber matrix is formed from cellulosic material such as wood pulp fluff. Patent 4,, to Westerman U. Powder-form polymers which absorb, even under pressure, aqueous liquids and blood, a method of producing them and their use in textile articles for body-hygiene applications. The geometric mean diameter is the square root of the product of the major cross sectional axis and the minor cross sectional axis. If the titrations are to be performed manually, great care must be taken to assure that equilibrium is reached after each addition of titrant.
Hydrogels: a journey from diapers to gene delivery
- The amount of fluid uptake is shown on the graph in Figure 18 and the fluid wicking distance in Figure
- Absorbent article having improved absorption and retention capacity for proteinaceous or serous body fluids.
- Therefore, the description herein of suitable super absorbent material should not be taken so as to limit the claims to exclude non-particulate SAP.
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, pampers and tampons hydrogels, 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 pampers and tampons hydrogels 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.
Pampers and tampons hydrogels. Hydrogels: a journey from diapers to gene delivery
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It is estimated that these surges correspond to the average bladder capacity of the infants being tested. In this example, however, a monomer concentration above that used in the process of the present invention is employed.
MAKING FERTILIZERS OUT OF DIAPERS!? (HYDROGEL)
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