preparation process for ionic silylated copolyurethanes with improved elasticity

Abstract

1) Process for preparing ionic silylated copolyurethanes comprising 2 ureido-alkylene-alkoxysilane terminal groups comprising: (i) the formation of –NCO-terminated copolyurethanes by polyaddition reaction between a polyisocyanate, a carboxylic diol and a polyol composition comprising a polyol of Mn greater than or equal to 2500 g / mol and a polyol of Mn less than 2500 g / mol; (ii) the neutralization of the product formed with a tertiary amine, (iii) a reaction with an aminosilane derived from a secondary amine. 2) Composition of ionic silylated copolyurethanes comprising 2 ureido-alkylene-alkoxysilane terminal groups, capable of being obtained by the process. 3) Crosslinkable adhesive and / or sealant composition comprising composition 2) and a filler.