Applicable Base Polymer Properties
The base polymers’ main chain provides low viscosity, low glass transition temperature, flexibility over a wide temperature range, and low color and odor. 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.