The present invention relates to stable solutions of urea diisocyanates in diisocyanates which are free from urea groups which solutions are prepared by a process which comprises reacting in the absence of a solvent at a temperature from about -20°C to about 80°C an organic diisocyanate with a bis-secondary diamine such that the NCO/NH-ratio is from 2.5 : 1 to 20 : 1. The solutions of the invention are well-suited for use as isocyanate component for the preparation of polyurethane resins by the isocyanate polyaddition process.
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(2008/06/13)
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