Process for the preparation of stable ionic dispersions of polyisocyanate-polyaddition products in hydroxyl containing compounds

A process for the in situ preparation of a stable dispersion of polyisocyanate-polyaddition products in hydroxyl containing compounds as dispersing agent which comprises reacting:

• (1) organic polyisocyanate with
• (2) at least one compound containing a group selected from the group consisting of primary amino groups, secondary amino groups, and primary hydroxyl groups in
• (3) as dispersing agent, an alcohol selected from the group consisting of alcohols containing 2 to 8 primary hydroxyl groups, alcohols containing 2 to 8 secondary hydroxyl groups, and mixtures thereof,
• with the proviso that compounds (3) have secondary hydroxyl groups if compounds with primary hydroxyl groups are used as compounds (2), and further characterized in that at least one of component (1) or (2) has groups selected from the group consisting of ionic groups and groups capable of salt formation.