Methods for making non-continuous absorbent cores comprising a porous macrostructure of absorbent gelling particles. For purposes of this invention, such hydrogel-forming polymer compositions are considered partially neutralized when at least 25 mole percent, and preferably at least 50 mole percent of monomers used to form the polymer are acid group-containing monomers which have been neutralized with a salt-forming cation. All of the carboxylate groups are then titrated to pH 2. The hydrogels swell and imbibe body fluids in the presence of hydrophilic functional groups in the polymeric backbone. Method and device for detecting ammonia odors and helicobacter pylori urease infection. Example No. Unitized fibrous constructs having functional circumferential retaining elements. This phenomenon is fully confirmed by the permeability tests discussed below, even though no significant differences in bulk change between composites having high vs. The sample 68 to be tested is placed flat and smooth under an g cylinder plate assembly 70 such that the cylinder 72 which has a 5. Accessed 23 Dec Richer C Richer investment adult incontinence products: an unfinished business, geotextiles report. Radiat Phys Chem — Absorbent composites were made by the method described in U. Particularly preferred absorbent articles herein are disposable diapers.
It has been found that it is desirable to utilize in absorbent structures and articles those polymer materials which form hydrogels having as high a gel strength as possible consistent with the realization of hydrogels of acceptably high gel volume. Hydrocolloid particles which have been found appropriate for use in absorbent composites of the present invention comprise a size distribution in a range from about to about micrometers and preferably from about to about micrometers, as measured using U. Absorbent article comprising edge barriers comprising a liquid absorbent thermoplastic composition. IX Abs. The components were added to mls. Process for making water-swellable material comprising coated water-swellable polymers. Significantly, the rate of uptake on the fourth fluid insult closely resembled the rate for the first insult for absorbent composites containing high AUL hydrocolloids. As shown graphically by the results summarized in Figures 17 and 21, Examples containing the relatively higher AUL hydrocolloid perform a significantly higher and more consistent amount of work against an applied load of up to about 1.
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Free format text : The hyrocolloid is a starch grafted crosslinked sodium salt of poly acrylic acid. NaCl, 3. Fluid is delivered from a nozzle 46 having 4 mm. Individual determinations may be higher or lower than the stated value. Absorbent members comprising absorbent material having improved absorbent property. This example also illustrates preparation of a polyacrylate-type hydrogel-forming material using an inverse suspension polymerization technique. Example No. Four hundred and fifty parts of doubly distilled water, 92 parts of acrylic acid, and 0. The hydrogels used in soft contact lenses, semi-permeable membranes and ion-exchange resins are not superabsorbent.
Hydrogels: a journey from diapers to gene delivery
- The following equation is used to calculate the gel volume: EQU1.
- Accessed 25 Oct Cosmetics Development, manufacture and use of cosmetic materials, Kap.
- Personal hygiene product is an inseparable part of urban society.
- The fluid volume per insult 60 ml is divided by the time elapsed between initial fluid contact and disappearance beneath the absorbent surface to determine the fluid intake rate.
- Kuklinski et al.
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. The degree of cross-linking in hydrogel and hydrogel-forming materials not only determines their water-solubility but is also an important factor in establishing two other characteristics of fluid absorbing hydrogels, i.
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 pampers and tampons hydrogels 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, pampers and tampons hydrogels, its derivatives have large application in various fields.
Pampers and tampons hydrogels. Hydrogels: a journey from diapers to gene delivery
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Such polymerization pampers and tampons hydrogels will generally involve a polymerization temperature of from about 20° C. This invention relates to improved hydrogel-forming polymer compositions and to a process for their preparation. By lowering the fluid source 26, the fluid intake is periodically halted, simulating actual multiple urine insults in use.
Marsai Martin Talks Periods and Tampons with Tampax
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