Acrylic Superabsorbents
“Commercially available superabsorbent polymer compositions include crosslinked polyacrylic acids or crosslinked starch-acrylic acid graft polymers, in which some of the carboxyl groups are neutralized with sodium hydroxide solution or potassium hydroxide solution. A primary use of superabsorbent polymer compositions is in sanitary articles, such as babies' diapers, incontinence products, or sanitary towels. For fit, comfort, and aesthetic reasons, and from environmental aspects, there is an increasing trend to make sanitary articles smaller and thinner. This is being accomplished by reducing the content of the high volume fluff fiber in these articles. To ensure a constant total retention capacity of body fluids in the sanitary articles, more superabsorbent polymer composition content is being used in these sanitary articles.” (Ahmed et al, US Patent 7,816,426, 10/19/2010)
Acrylic Copolymer Superabsorbents
Applications |
Sorbents
Superabsorbents
Recent US Patents
10/19/2010
7,816,426
Superabsorbent polymer compositions having color stability
Ahmed et al of Evonik Stockhausen, North Carolina have developed superabsorbent polymers based on superabsorbent polymer particles surface treated with from about 0.01% to about 5% by weight of an antioxidant. (RDC 1/24/2011)
Recent Journal Articles
Reversible Swelling/Deswelling Characteristics of Ethylene Glycol Dimethacrylate Cross-Linked Poly(acrylic acid-co-sodium acrylate-co-acrylamide) Superabsorbents
(10918–10927) Industrial & Engineering Chemistry Research 50 #18 (2011)
Monazam, Shadle and Siriwardane of the U.S. Department of Energy and EM Engineering Services, West Virginia, found the sorbent maximum or equilibrium CO2 uptake to be linearly dependent on temperature; decreasing with increasing temperature when tested in a 100% CO2 environment. Reactivity data for amine/bentonite particle with CO2 were presented and discussed. On the basis of the isothermal TGA results, reaction order and the value of activation energy have been obtained. These kinetic parameters are similar to those reported for MEA and DEA in aqueous solutions. The kinetic model was used to predict the fractional conversion at different temperature exhibiting good agreement with experimental data. (RDC 10/3/2011)