Mironov,V.F. et al., Journal of general chemistry of the USSR, 1969, vol. 39, p. 776 - 778
作者:Mironov,V.F. et al.
DOI:——
日期:——
PRODUCTION OF ISOCYANATE FUNCTIONAL ORGANOSILANES
申请人:Wacker Chemie AG
公开号:US20170320896A1
公开(公告)日:2017-11-09
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.
Isocyanate-functional silanes, particularly isocyanate-functional α-silanes, are prepared in good yield by a liquid phase thermolysis conducted in the presence of a catalyst at a pressure of >100 mbar, or >80 mbar when a thin-film evaporator is used.