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Microencapsulation

Patent Abstracts

From 06/23/2014 through 5/23/2012

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Patents with Abstracts

4. 8,242,056 
Agriculture actives delivery composition comprising boron and persulfate ion-crosslinked polyvinyl alcohol microcapsules and method of use thereof
 
Bobnock of Appleton Papers Inc., Wisconsin, developed an aqueous suspension with a pH of 2.0 to 12.8 and boron or persulfate ion-crosslinked polyvinyl alcohol microcapsules for agriculture. (RDC 8/29/2012)

3. 8,193,334 
Polymer-encapsulated reverse micelles
 
Radovic-Moreno et al of The Brigham and Women's Hospital and the Massachusetts Institute of Technologoy , Massachusetts, developed a method for encapsulating nucleic acids, particularly siRNAs, shRNAs, microRNAs, gene therapy plasmids, and other oligonucleotides in biodegradable polymers.  The nucleic acids are formulated into reverse micelles composed of non-toxic and/or naturally-occurring lipids prior to nanoparticle formation by nanoprecipitation. This method can be coupled to other techniques that improve intracellular drug targeting, ultimately enhancing intracellular delivery of the aforementioned nucleic acids. (RDC 6/27/2012)

2. 8,192,841 
Microencapsulated delivery vehicle having an aqueous core
 
Amundson et al of Kimberly-Clark, Wisconsin, developed a microencapsulated delivery vehicle suitable for use in personal care products, such as wet wipes. This includes an aqueous core of an encapsulating activator, a matrix material, such as water, and an active agent that may or may not be surrounded by a hydrophobic wax material.  A surfactant is introduced into a liquid solution containing a crosslinkable compound.  Once in the liquid solution, the encapsulating activator reacts with the crosslinkable compound to form an encapsulation layer that surrounds the aqueous core composition.  After a sufficient time has passed, the encapsulated aqueous core composition containing the active agent is removed from the liquid solution.  The encapsulated aqueous core may then be subjected to one or more further processing steps to introduce additional layers of encapsulation onto the formed shell.  These layers may include, for example, a moisture protective layer to reduce the potential for deactivation of the active agent due to leaking of the agent from the capsule into the product, and a fugitive layer to impart mechanical strength to the capsule. (RDC 6/25/2012)

1. 8,177,904 
Use of polymeric microparticles in building material mixtures
 
Einfeldt et al of Construction Research & Technology and Evonik Rohm, Germany, used hollow polymeric 0.1 to 1 micron diameter microparticles in hydraulically setting building material mixtures where 10 to 100% by volume is filled with water.  This makes concrete resistant to freezing and thawing.  In addition, the compressive strength of the correspondingly hardened concrete is substantially improved.  The microparticles consist of  a polymer acid core (A) and a nonionic polymer shell (B).  The unsaturated carboxylic acid (derivative) can be acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid or crotonic acid.  (RDC 5/23/2012)

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Roger D. Corneliussen
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Copyright 2012 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 5/23/2012.