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from 5/2/2012

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Patents with Abstracts

2.  8,383,755 
Enzyme-medicated cross-linking of silicone polymers 

Zelisko, Arnelien and  Frampton of Canada, cross-linked silicone polymers by contacting a silicone polymer and a cross-linking agent with a hydrolytic enzyme under conditions for the cross-linking of the silicone polymer, wherein the silicone polymer has been modified to comprise functional groups that react with the hydrolytic enzyme.  Trypsin and pepsin effectively catalyzed the cross-linking of .alpha.,.omega.-(triethoxysilyl)ethyl-polydimethylsiloxane (TES-PDMS), similar to dibutyltin dilaurate.  Studies showed little difference between the products of the dibutyltin dilaurate- and trypsin-catalyzed systems.  (RDC 3/6/2013)

1. 8,133,600 
Siloxane polymerization in wallboard
Wang et al of United States Gypsum Company, Illinois,  induced complete silicone polymerization with magnesium oxide and class C fly ash in gypsum wallboard.  The slurry used in water-resistant gypsum articles that includes making an emulsion of siloxane and water, then combining the slurry with a dry mixture of stucco, magnesium oxide and Class C fly ash. The slurry is then shaped as desired and the stucco is allowed to set and the siloxane polymerizes. The resulting product is useful for making a water-resistant gypsum panel having a core that includes interwoven matrices of calcium sulfate dihydrate crystals and a silicone resin, where the interwoven matrices have dispersed throughout them a catalyst comprising magnesium oxide and components from a Class C fly ash.  (RDC 5/2/2012)


Roger D. Corneliussen

Maro Polymer Links
Tel: 610 363 9920
Fax: 610 363 9921


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

** Date of latest addition; date of first entry is 5/2/2012.