| 摘要 |
Novel compounds having an average isocyanate functionality of greater than 2 are synthesized by the reaction of a (poly)isocyanate having an average functionality of greater than 2, with a compound X comprising a function B(H)n or B'(H)n' where <u style="single">n is equal to 1 or 2, <u style="single">n' is equal to 1, 2 or 3, H is a labile hydrogen atom and B is O, S, N, N being a primary or secondary nitrogen atom, -C(-O)-O, -C(-O)-N, or else the groups O-P(O)2; O-P(O)OR1; O-P(O)3; O-P(O)2OR1; O-P(O)-OR1, and B' is -SiR2R3R4, such reaction being carried out with a compound X/[compound X+(poly)isocyanate] weight ratio of at most 50%; compositions comprised thereof are of the hardener type and can be formulated into coatings of the paint or varnish type.
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