Abstract: Pulverulent particles (P) have surface groups of the general formula (1): —O1+n—SiR12?n—B, the average diameter of the particles (P) following dispersion in water with a pH range of 1 to 12 being less than or equal to 200 nm, and being determined as the average hydrodynamic equivalent diameter in the form of the Z-average by means of photon correlation spectroscopy, R1 being an optionally substituted aliphatic or aromatic hydrocarbon radical having 1-12 carbon atoms, B being an optionally substituted aliphatic or aromatic hydrocarbon radical containing at least one organic acid function and/or salt thereof, and n being 0, 1 or 2.

Abstract: Alkoxysilyl-terminated prepolymers in which the alkoxysilyl group is linked to a tertiary nitrogen group through a Cl carbon spacer exhibit excellent moisture curing reactivity and yet are easily prepared. The tertiary nitrogen group-containing ?-aminoalkoxysilyl group is introduced into the prepolymer by reacting a tertiary nitrogen group-containing ?-aminoalkoxysilane with an isocyanate-terminated prepolymer or isocyanate-functional precursor thereof.

Abstract: Alkoxysilane-terminated prepolymers prepared by reaction of a methylene-spaced isocyanate-reactive group-containing alkoxysilane in molar excess with an isocyanate-reactive prepolymer have high reactivity towards atmospheric moisture while preparing elastomers of high tensile strength and elongation.

Abstract: Alkoxysilyl-terminated preopolymers prepared by reacting an alkoxysilane with a prepolymer prepared by reacting a di- or polyisocyanate with both a low molecular weight diol or polyol and a high molecular weight polyol, the respective polyol components present within a specific ratio range, and giving rise to an increased content of urethane groups, and an inhomogenous distribution thereof exhibit high tensile strength and elongation, even without the use of fillers.