Isocyanate-functional silanes are prepared in high yield by pyrolysis of an O-carbamate prepared by reaction of a dialkylcarbonate with an aminoalkyl-functional silane in the presence of a basic catalyst, where the catalyst is neutralized by an acid which has a pK
a
of all protolysis stages of not more than 4. The neutralized or partially neutralized catalyst need not be removed prior to pyrolysis. The isocyanato-functional silanes exhibit higher storage stability as compared to those prepared from O-carbamates where catalyst neutralization is effected by weak acids.
                            异氰酸酯官能基
硅烷通过在碱性催化剂存在下,通过将二烷基
碳酸酯与
氨基烷基官能
硅烷反应制备的O-
氨基甲酸酯的热解制备,高产率地制备。其中,催化剂通过pKa不超过4的酸中和。在热解之前,中和或部分中和的催化剂无需去除。与通过弱酸中和效果的O-
氨基甲酸酯制备的
异氰酸酯官能基
硅烷相比,这些
异氰酸酯官能基
硅烷表现出更高的储存稳定性。