Patent ID: 8088880
Filing Date: 2012-01-03
Classification: C08G,C08K

Abstract:
1. Process for preparing a dispersion, stable with respect to viscosity and agglomeration, of nanoparticle-modified polyisocyanates, the process comprising the steps of 1) reacting A) polyisocyanates with B) alkoxysilanes of the formula (I) in which Q is an isocyanate-reactive group, X is a hydrolysable group, Y is identical or different alkyl groups, Z is a C a is an integer from 1 to 3, and subsequently 2) incorporating by dispersion C) inorganic particles having an average particle size of less than 200 nm as determined by means of dynamic light scattering in dispersion, wherein the inorganic particles have been surface-modified by silanisation with alkoxysilanes and/or chlorosilanes; wherein the ratio of free NCO groups of the polyisocyanates of component A) for modification to the NCO-reactive groups Q of the alkoxysilane of the formula (I) is 1:0.01 to 1:0.75.