23432-62-4Relevant articles and documents
The isocyanate group-containing alkoxysilane method (by machine translation)
-
Paragraph 0102-0106, (2020/10/03)
[Problem] an isocyanate group-containing alkoxysilane isocyanate group-containing alkoxysilane having high purity can be efficiently produced. [Solution] The amino group-containing alkoxysilane is reacted with dialkyl carbonate, carbamate alcohol mixture is obtained. Then, the mixture was heated to obtain an isocyanate group-containing alkoxysilanes. In this case, alcohol-containing fractions of 1 second, isocyanate group-containing alkoxysilane containing 2 fractions of a second, annular byproducts including 3 a fraction is obtained. The, the first fraction of the heated mixture before mixing 3, annular reaction byproduct alcohol, cyclic carbamate returned products. Figure 1 [drawing] (by machine translation)
PROCESS FOR PREPARING ISOCYANATES CONTAINING ALKOXYSILANE GROUPS
-
Paragraph 0087; 0088; 0089; 0090; 0091; 0092; 0093, (2019/10/17)
The invention relates to a process for preparing isocyanate containing alkoxysilane groups, in which, in the sequence of steps A) to D), A) alkoxysilano(cyclo)alkylamine is reacted with dialkyl carbonate in the presence of a basic catalyst to give alkoxysilano(cyclo)alkylurethane,B) simultaneously or successively, the catalyst is deactivated, and low boilers, solids, salt burdens and/or high boilers are removed,C) alkoxysilano(cyclo)alkylurethane obtained after B) is thermally cleaved to release isocyanate containing alkoxysilane groups and by-product, leaving bottoms material, andD) isocyanate containing alkoxysilane groups and by-product are separated from one another and from bottoms material and collected, pa wherein the process regime at least of steps C) to D) is continuous.
PROCESS FOR PREPARING ISOCYANATES CONTAINING ALKOXYSILANE GROUPS
-
Paragraph 0086-0088, (2019/10/23)
The present invention relates to a process for preparing isocyanate containing alkoxysilane groups, in which, in the sequence of steps A) to D), A) alkoxysilanoalkylamine is reacted with urea in the presence of an alcohol, optionally in the presence of at least one catalyst, to give alkoxysilanoalkylurethane, B) simultaneously or successively, if used, the catalyst is removed and/or deactivated, and low boilers, medium boilers and/or high boilers are removed, C) purified alkoxysilanoalkylurethane is thermally cleaved to release isocyanate containing alkoxysilane groups and by-product, leaving bottoms material, and D) isocyanate containing alkoxysilane groups and by-product are separated from one another and from bottoms material and collected, in which, in step C), i) the bottoms material is wholly or partly discharged from the cleavage apparatus,ii) subjected to thermal treatment and/or purification and/or an aftertreatment in the presence of alcohol andiii) the material removed, after thermal treatment and/or purification and/or aftertreatment in step B) or C), is fed in again.
