Applicable Base Polymer Properties
The polymer’s polyether main chain provides low viscosity, low glass transition temperature, flexibility over a wide temperature range, and low color and odor. Since the main chain does not contain any highly cohesive segments, these polymers do not generally need solvent or plasticizer.
Silane terminated polyether polymers offer a low viscosity in the range of 8,000-12,000 cps despite their high molecular weight. The viscosity is relatively stable throughout a wide range of temperatures. As a result, compounding is generally easy and straight-forward. The silane groups provide a non-isocyanate curing mechanism, good adhesion to various substrates, and good storage stability. The silyl reactive end-groups cure in the presence of moisture and an appropriate catalyst by means of an alkoxy reaction that is different than the conventional silicone cure mechanism.