remarkablepampers and tampons hydrogelsopinion you commit

The density of the composite 16 should be in the range of about 0. This procedure removes traces of detergents and other contaminants which would otherwise interfere with the titration. It was then left at 40° C. It has furthermore been discovered that the particular combination of gel volume. The solution in the weighing vial is reduced to dryness in an oven at ° C. Absorbent articles and methods for their preparation from crosslinkable solutions of synthetic carboxylic polyelectrolytes. One essential element of such a reaction mixture is, of course, the acid group-containing monomer material which will form the backbone of the hydrogel-forming polymers to be produced. Following complete addition, the contents of the kettle were allowed to stir for 4 hours before the swollen polymer was isolated by filtration and dried under reduced pressure at 80° C. The hydrogel-forming polymer compositions of the present invention are those which have a gel volume of at least about 20 grams of synthetic urine per gram of hydrogel-forming polymer. Exemplary of superabsorbent material suitable for use in the present invention are polyacrylamides; polyvinyl alcohol; ethylene maleic anhydride copolymers; polyvinyl ethers; hydroxypropylcellulose; carboxy­ methycellulose; polymers and copolymers of vinyl sulfonic acid; polyacrylates; starch grafted polyacrylates; and the like. 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. The matrix may also be formed from a mixture of wood pulp fluff and the meltblown fibers discussed above. Ref country code : GB Payment date : Year of fee payment : EPA1 en.

DET2 en. This data clearly demonstates the desirability of employing a relatively high AUL superabsorbent material. The diaper core is described in greater detail in the following Table I:. Absorbent capacity of "gel volume" is a measure of the amount of water or body fluid which a given amount of hydrogel-forming material will absorb. A third essential step in the polymer preparation process herein involves the neutralization of the acid functional groups of the polymers formed in the aqueous reaction mixture. 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. After 45 seconds, the reaction mixture had gelled and could no longer be stirred. Liquid impermeable, moisture vapour permeable layers and films comprising thermoplastic hydrophilic polymeric compositions.

Publication types

RUC1 en. In view of the foregoing, it is an object of the present invention to provide improved hydrogel-forming polymer compositions which are free of starch or other polysaccharide-based polymer material but which nevertheless have desirably high gel volume and gel strength characteristics and which have acceptably low levels of extractable polymer therein. Patent 4,, to Kellenberger et al. Absorbent members comprising absorbent material having improved absorbent property. Conventional redox initiator systems can also be utilized. Such non-acid monomers can include, for example, the water-soluble or water-dispersible esters of the foregoing acid-containing monomers as well as monomers which contain no carboxyl or sulfonic acid groups at all. Four hundred fifty parts of doubly distilled water, 92 parts of acrylic acid, and 0. Singly or as a result of a combination of these mechanisms, leaching of polymer into the body fluid to be absorbed can result in less efficient utilization of the hydrogel-forming polymer in the absorbent article and a greater incidence of undesirable leakage of body fluid from the article. Method and device for determining the swelling behavior of polymer gels under pressure. J Bioact Compat Polym 23 1 — Disposable absorbent article with varied distribution of absorbent particulate polymer material and method of making same. After another 15 minutes, the valve was opened to obtain the final fluid intake rate. Absorbent article having rapid acquiring, wrapped multiple layer absorbent body. Of all the foregoing unsaturated, acid-containing monomers, preferred monomers include acrylic acid, methacrylic acid, and 2-acrylamidomethyl propane sulfonic acid.

Hydrogels: a journey from diapers to gene delivery

• Green Chem 8 5 —
• Green Chem 8 5 —
• A hydrogel-forming polymer composition according to claim 4 wherein the relationship between gel volume, v, and equilibrium extractable polymer content, e, is defined by the equation:.

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 pampers łódź cena : 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, pampers and tampons hydrogels, form hydrogels. Such polymer materials have relatively high gel volume and relatively high gel strength as measured by shear pampers and tampons hydrogels 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.

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

Kind code of ref document : A1. Effective date : Kind code of ref document : B1. Ref document number : Country of ref document : DE. Date of ref document : Ref country code : GB. Pampers and tampons hydrogels legal event code : E. Ref country code : ES. Ref legal event code : FG2A. Country of ref document : ES.

Buying options

.

This relationship between performance and AUL has pampers and tampons hydrogels heretofor been recognized. EPA2 en. A 4-necked, 1-liter round-bottomed resin kettle equipped with a stirrer, a reflux condenser, a jacketed dropping funnel, and an inert gas dispersion tube was charged with ml of cyclohexane and 3.