A curing agent for epoxy resins is prepared from an amine and an epoxy, as well as subsequent modification by a polyisocyanate compound, in such a manner that the curing agent is in the form of small spherical particles. The particles can be as small as 0.1 microns. This curing agent can be easily dispersed...http://www.google.com/patents/US5554714?utm_source=gb-gplus-sharePatent US5554714 - Spherical curing agent for epoxy resin, curing agent masterbatch for epoxy resin and their preparation.
