PREPOLIMEROS THAT PRESENT LOW VISCOSITY ALCOXISILAN GROUPS, A PROCEDURE FOR ITS PREPARATION AS WELL AS ITS USE.

摘要

Process for the preparation of prepolymers containing alkoxysilane groups, in which A) 1.0 gram equivalent of a polyol component with a number average molecular weight of 3,000 g / mol to 20,000 g / mol, containing one or more is reacted polyoxyalkylene polyols or polyoxyalkylene polyol prepolymers with B) of 1.05 to 1.50 gram equivalents of a compound having isocyanate and alkoxysilane groups of formula (I), wherein X, Y, Z are independently of each other C1- alkyl moieties C8 or C1-C8 alkoxy, wherein at least one of the moieties is a C 1 -C 8 alkoxy group and R is an at least difunctional discretionary organic moiety, preferably an alkylene radical having 1 to 8 carbon atoms, and then C ) the remaining free NCO groups are further reacted by an allophanate or a reaction with reactive compounds against isocyanate.