Alkoxysilyl-terminated preopolymers prepared by reacting an alkoxysilane with a prepolymer prepared by reacting a di- or polyisocyanate with both a low molecular weight diol or polyol and a high molecular weight polyol, the respective polyol components present within a specific ratio range, and giving rise to an increased content of urethane groups, and an inhomogenous distribution thereof exhibit high tensile strength and elongation, even without the use of fillers.
通过将一种烷氧基
硅烷与一种预聚物反应制备得到的烷氧基
硅烷末端预聚物,该预聚物是由一种双或多
异氰酸酯与低分子量二元醇或多元醇和高分子量聚醇反应制备而成,所述聚醇组分在特定的比例范围内,并导致
尿素基含量增加和不均匀分布,即使不使用填料,也具有高拉伸强度和延展性。