Production of stable polyurea-polyol dispersions, useful for production of polyurethane, especially flexible polyurethane foam

摘要

A process for the production of stable dispersions of ureas in polyols by adding NH-functional compounds (A) to polyols and reacting with isocyanates, in which compounds (A) are primary and/or secondary amines, alkanolamines and/or hydrazine derivatives and/or hydrazide derivatives together with monofunctional aliphatic amine(s). Independent claims are included for: (a) stable dispersions of ureas in polyols, obtained by this process; and (b) a process for the production of polyurethanes by reacting isocyanates with these polyurea dispersions in presence of blowing agents, catalysts and optionally fire retardants and other additives.