Maro Publications

Silicone Copolymers

Patents with Abstracts

*8/29/2012

Maro Topics

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Patents with Abstracts

2. 8,242,189 
Silicone-urethane copolymers
 
Regan of AdvanSource Biomaterials Corporation, Massachusetts, formed silicone urethane copolymers from a reaction mixture of a diisocyanate, a polycarbonate diol, a polysiloxane, a C2-8 diol chain extender, and optionally a monofunctional siloxane chain terminator under an inert gas in the presence of a catalyst to initiate a one-step polymerization reaction.  The temperature of the reaction mixture is monitored, and the admixing step is terminated when the reaction mixture reaches a predefined temperature. The material can be further crosslinked by heating in an oven for a suitable period of time to ensure completion of the reaction. (RDC 8/29/2012)

1. 8,211,955 
Actinically-crosslinkable silicone-containing block copolymers
 
Chang and Wang of Novartis AG, Switzerland, developed a new class of silicone prepolymers containing poly(oxyalkylene) blocks, polysiloxane blocks, and actinically-crosslinkable groups which are acryl groups, thiol groups, ene-containing groups.  A preopolymer of the invention is prepared in a one-pot procedure according to the Michael addition of thiol to electron deficient alkenes, such as .alpha.,.beta.-unsaturated carbonyl compounds, without need for additional reaction step(s) to introduce actinically crosslinkable groups. The present invention is also related to silicone hydrogel contact lenses made from this class of silicone-containing prepolymers and to methods for making the silicone hydrogel contact lenses. (RDC 7/10/2012)

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Interested!!
Bookmark this page to follow future developments!.
(RDC 6/5/2012)

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Roger D. Corneliussen
Editor
www.maropolymeronline.com

Maro Polymer Links
Tel: 610 363 9920
Fax: 610 363 9921
E-Mail: cornelrd@bee.net  

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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 7/10/2012.