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Superabsorbents

Patent Abstracts

From 06/27/2014 through 4/26/2013

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Patent Abstracts

2. U.S. Patent 8,568,883 (October 29, 2013). “Superabsorbent Polymer Particles with Improved Surface Cross-Linking and Improved Hydrophilicity and Method of Making Them Using Vacuum UV Radiation,” Andreas Flohr, and Torston Lindner (Procter & Gamble Company, Cincinnati, Ohio, USA).

Superabsorbent polymers (SAPs) are well known.  Gel blocking reduces absorbent capacity.  Swollen SAP particles become very soft and deform easily. Upon deformation the void spaces between the SAP particles are blocked increasing liquid flow resistance.  Flohr, and Lindner produced superabsorbent polymer particles of poly(meth)acrylic acid and salts.  These particles are irradiated with vacuum 100 to 200 nm UV radiation.  Crosslinking covalent bonds are formed on the particle surface and not within the particles.  The particles retain their rigidity during absorption reducing gel blocking.

1. 8,403,904 
Superabsorbent polymer having a capacity increase 
(3/26/2013)

A superabsorbent polymer (SAP) is a crosslinked partially neutralized polymer, including crosslinked polyacrylic acids or crosslinked starch-acrylic acid graft polymers, that is capable of absorbing large amounts of aqueous liquids and body fluids, such as urine or blood, with swelling and the formation of hydrogels, and of retaining the aqueous liquids under a certain pressure.  A primary use of superabsorbent polymer and superabsorbent polymer compositions is in sanitary articles, such as babies' diapers, incontinence products, or sanitary towels.  The current trend in absorbent articles including diapers, is toward ever thinner core constructions having a reduced or zero cellulose fiber, or fluff, content and an increased SAP content.  There is still a need to improve the absorbent capacity and gel strength of particulate superabsorbent polymer at the same time.

Tian, Bergman, Jr. and Shi of Evonik Stockhausen, LLC., North Carolina, developed a particulate superabsorbent polymer consisting of a monomer and an internal crosslinker agent with a Centrifuge Retention Capacity Increase of 2 g/g.  The internal crosslinker agent is a silane compound with one vinyl group or allyl group attached to a silicon atom and at least one Si--O bond.

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Roger D. Corneliussen
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Copyright 2013 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen
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** Date of latest addition; date of first entry is 4/23/2013.