Polyurea-polyol dispersions with a long shelf life, process for their preparation and their use for the production of polyurethane foams

摘要

The invention relates to polyurea-polyol dispersions with a long shelf life which contain a) from 2 to 35 % by weight, based on the entire dispersion, of a polyurea prepared from modified aliphatic and/or cycloaliphatic polyisocyanates and aliphatic amines and/or optionally substituted monoaminobenzenes or modified aromatic polyisocyanates and aliphatic amines and, b) from 98 to 65 % by weight, based on the entire dispersion, of a bifunctional to hexafunctional polyol having a hydroxyl number of from 20 to 600. The dispersions are prepared by in-situ reaction of the modified polyisocyanates with aliphatic amines and/or monoaminobenzenes in polyols, have, at a polyurea content of 10 % by weight, a viscosity at 25 DEG C of from 1000 to 2500 mPa.s and a clear point of from 100 to 300 DEG C and are particularly suitable for the production of polyurethane foams.