In accordance with the present invention, however, substantially all of the unsaturated, acid group-containing monomers in the aqueous reaction mixture must be polymerized in their free acid, unneutralized form. A method of determining moisture in an absorbent sanitary article and apparatus for carrying out the method. Organic-soluble free radical initiators are usually employed. Generally, superabsorbent material dispersed in a fibrous matrix enhances the fluid holding capacity of the composite. Absorbent article with apertured backsheet and fibrous super absorbent material. EQU4 As indicated, the extractables value obtained from this calculation is believed to approximately correspond to a hour equilibrium extractables content value in synthetic urine. The polymer material formed in the reaction mixture, either before or after neutralization, can be dried by any conventional method. An additional optional process step which can be, and usually will be, utilized in connection with the polymer preparation process herein involves drying and recovery of hydrogel-forming polymer material. In addition to relatively high gel volume and gel strength characteristics, a third essential feature of hydrogel-forming materials which are especially useful as fluid absorbents in absorbent structures and articles relates to the level of extractable polymer material present in such hydrogel-forming material. The inventor has discovered that by selecting the size of the superabsorbent material the effects of gel-blocking can, at least to an extent, be further minimized. To the quickly stirred solution cooled to 14° C.
This example illustrates the preparation of a sulfonic acid-containing polymer which forms a hydrogel having the characteristics of those of the present invention by virtue of the use of the free acid monomers in relatively low concentrations. The topsheet and the backsheet are placed at opposite sides of the absorbent structure. This data clearly demonstates the desirability of employing a relatively high AUL superabsorbent material. The cross-linking agent will generally comprise from about 0. It is further believed that results observed with Example VIII indicate the significance of the particle size distribution in performance of the composite.
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J Bioact Compat Polym 23 1 — For example, one component of a two-component redox initiator system may be premixed into the aqueous reaction mixture, and the other component can then be added incrementally in amounts sufficient to promote complete polymerization of the acid-containing monomers and cross-linking agent. Nevertheless, the application of these absorbent polymers in consumer products was not to be recognized until much later. This phenomenon is fully confirmed by the permeability tests discussed below, even though no significant differences in bulk change between composites having high vs. One known type of hydrogel-forming material having the requisite gel volume and gel strength characteristics for use in absorbent articles is the water-absorbing starch resin disclosed in Masuda et al; U. Charlesby A The degradation of cellulose by ionizing radiation. Ref country code : NL. The hydrogel formed from this powder has a shear modulus of 1. If glass beakers are being used, they must be acid washed prior to use as noted hereinbefore. Utilization of such relatively low monomer concentrations is believed to be one factor which serves to minimize the extractable polymer content of the resulting hydrogel-forming polymer materials. Such monomer concentrations are generally somewhat below those which have heretofore been commonly utilized to prepare hydrogel-forming polymers of the same general type as those of this invention. One minute after the initial fluid insult is imbibed, a second insult of the same size is introduced.
Cellulose-Based Hydrogel for Personal Hygiene Applications | SpringerLink
- 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.
- 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.
- More preferably, the novel polymer materials herein have a gel volume of from about 25 to 80 grams of synthetic urine per gram of hydrogel-forming polymer.
- Harper et al; U.
- USREE1 en.
- Therefore the use of particles having a smaller size distribution outside the appropriate specified range does not provide a sufficient opportunity for the particles to perform work against a restraining force.
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.
Year of fee payment : 4. Year of fee payment : 8. Year of fee payment : Effective date pampers and tampons hydrogels 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.
Pampers and tampons hydrogels. Hydrogels: a journey from diapers to gene delivery
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Organic-soluble free radical initiators are usually employed. EP-A,; published Oct.
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