Aqueous polyurea dispersions prepared by an emulsion polymerization process

摘要

The present invention is directed to a aqueous polyurea dispersion for the preparation of an aqueous polyurea dispersion by I) dispersing in water at an NCO:NH equivalent ratio of 0.5:1.0 to 2.0:1.0 a) a polyisocyanate which has an average functionality of 1.5 to 4.0 and an isocyanate content of at least 12% by weight and b) a polyamine component containing i) 30 to 70 mole percent of a polyamine having at least two primary and/or secondary amino groups and a molecular weight of at least 1000 and ii) 30 to 70 mole percent of a polyamine having at least two primary and/or secondary amino groups, a molecular weight of less than 400 and at least one anionic or potential anionic group and II) allowing the polyisocyanate and polyamine component to react to form an aqueous polyurea dispersion. The present invention is also directed to the aqueous polyurea dispersion prepared by this aqueous polyurea dispersion.