Silicone-Urea and Silicone-Urethane Segmented Terpolymers also Containing Polyether and Polyester Soft Segments and Their Method of Preparation

Description:
Novel synthetic techniques were developed for the preparation of siloxane-urea segmented copolymers containing a gradient polyether interphase, with controlled morphologies and properties. This new process allows the preparation of high molecular weight, high strength siloxane-urea copolymers with urea hard segment contents ranging from 10 to over 40% by weight.  Polymer properties that can independently be controlled include modulus (10 to 120 MPa), ultimate tensile strength (2.5 to 22 MPa). level of equilibrium water absorption (~0 to 100% by weight) and refractive index (1.43 to 1.46).
  
Patent Information:
Title App Type Country Serial No. Patent No. File Date Issued Date Expire Date
Segmented Urea and Siloxane Copolymers and Their Preparation Methods US Utility *United States 11/152,844 7,262,260 6/15/2005 8/28/2007 6/15/2025
Category(s):
Materials
Chemicals
For Information, Contact:
Li Chen
Licensing Associate
Virginia Tech Intellectual Properties, Inc.
(540) 443-9217
lchen@vtip.org
Inventors:
Iskender Yilgor
Emel Yilgor
Garth Wilkes
Jignesh Sheth
Keywords:
Materials/Polymers
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