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Without being bound by theory, it is believed that such polymer material extracted by body fluid in this manner can alter both the chemical and physical characteristics of the body fluid to the extent that the fluid is more slowly absorbed and more poorly held by the hydrogel-containing absorbent article. When examined in light of the test results discussed below, SAP particle size is a significant parameter affecting per­formance of the hydrocolloids in the absorbent composites. The results shown in Figure 20 indicate that the rate of fluid uptake increased, even with increased hydrocolloid particle concentration, for those examples having composites containing relatively higher AUL hydrocolloids. When the temperature had fallen to 40° C. Argon gas was introduced to expel dissolved oxygen, and the temperature was elevated to 65° C. The percent extractable polymer e is calculated from the weight of dry polymer W p and weight of residue W r by the following equation. Year of fee payment : The polymer is isolated in a swollen state by filtration and dried under reduced pressure at 80° C. When the porous fiber matrix comprises synthetic polymeric fibers, the superabsorbent material has an AUL of at least about 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.

Organic-soluble free radical initiators are usually employed. Each panelist receives sixty diapers, thirty of the test diaper and thirty of the control. Transparency Market Research report Hydrogel market structure — amorphous, semi-crystalline, crystalline; product — polyacrylate, polyacrylamide, and silicone; application — personal care and hygiene, pharmaceuticals, food, agriculture, and healthcare — global industry analysis, size, share, growth, trends, and forecast — One hour of equilibration at ambient temperature under gentle stir-bar stirring is sufficient for swelling equilibrium to be attained. Patent 4,, to Westerman U. J Biomed Mater Res A 77 4 —

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The transparent, rubbery particles were then added to parts of methanol at 40° C. Accessed 10 Nov Due to fast swelling and other extraordinary properties i. Water-insoluble hydrogel-forming polymers are materials which are capable of absorbing large quantities of fluids such as water and body waste and which are further capable of retaining such absorbed fluids under moderate pressures. Extractable polymer content of carboxylic acid-based hydrogel-forming material is determined by admixing the hydrogel-forming polymer with synthetic urine for a period of time sufficient to substantially approach equilibrium with respect to extraction of polymer material from the hydrogel which is formed. As is the case with disposable diapers, sanitary napkins utilizing the present absorbent structures may be derived from conventional sanitary napkins by simply replacing the absorbent core thereof typically a web of wood pulp fibers with the polymer-containing absorbent structure of the present invention. Disposable absorbent articles with masking topsheet having one or more openings providing a passageway to a void space. J Appl Polym Sci 91 6 — Furthermore, rate of fluid absorption is affected by particle size. III Ex. Patent 3,, to Assarsson et al. The test results indicate that a reduction in wicking occurred due to swelling of the hydrocolloid particles and, consequently, the clogging of the pores in the samples of Example II.

Hydrogels: a journey from diapers to gene delivery

• Unitized fibrous constructs having functional circumferential retaining elements.
• It should be noted that both of these procedures may provide results that include in the total amount of extractable material those extractable components in the hydrogel which are not polymeric.
• Patent 4, to Bernardin, the entire disclosure of which is herein incorporated by reference and relied upon.

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. Water-insoluble hydrogel-forming polymers are materials which are capable of absorbing large quantities of fluids such as water and body waste and which are further capable of retaining such absorbed fluids under moderate pressures. These absorption characteristics of such materials make them especially useful for incorporation into absorbent articles such as disposable diapers. Harper et al; U. These polymers are rendered water-insoluble by cross-linking the carboxyl group-containing polymer chains using conventional cross-linking agents such as di- or poly-functional monomer materials.

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 pampers and tampons hydrogels. 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.

Pampers and tampons hydrogels. Hydrogels: a journey from diapers to gene delivery

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The diaper according to claim 25 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. 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. In one preferred embodiment of pampers and tampons hydrogels present invention, the porous fiber matrix is formed from cellulosic material such as wood pulp fluff.

How To Use A Tampon (Non-Applicator)