|
Written by Renato Rindone
|
|
Monday, 31 August 2009 09:42 |
Epoxy Silanes 
In a recent Switzerland patent to Sika Technology (Frick, Karsten et. al.; PCT Int. Application WO 2009 65,914; 28 May 2009) a carboxy terminated polybutadiene-acrylonitrile copolymer (CTBN), modified with epoxy functionality and terminated with carboxy end groups was described. It was shown that these polymers were extremely effective as agents for improving the impact strength of epoxy resin compositions. These formulations are especially efficient adhesives for gluing on metal surfaces. It was shown in our labs that the reaction silyl epoxides or silicone diepoxides, such as PC-1000 [bis-2-(3,4-epoxycyclohexylethyl)-1,3-tetramethyldisiloxane] with CTBN could be greatly accelerated using Hycat™ 2000 or Hycat™ OA. Complete reaction was achieved either at elevated (ca. 80 OC) or at ambient temperature giving cured polymers with excellent adhesive attributes. The photo shows typical polymer properties (just taken from the curing oven), at elevated temperature, after ten minutes. These polymers may have beneficial use in armor protection (bullet proof vests).
|
