Stable, aqueous epoxy resin dispersions, processes for their preparation, and their use

摘要

Stable, aq. epoxy resin dispersions (I) contain (A) an epoxy resin obtd. by the condensation of (A-1) cpd(s). contg. at least two epoxide gps.; with (A-2) an aralkylated polyhydroxy-aromatic obtd. by reacting (A-2-1) polyhydroxy-aromatics with (A-2-2) aromatics contg. an alkylene gp.; (B) a dispersant; and (C) water. Also claimed are (i) the prodn. of (I) by reacting (A-1) with (A-2) to give an epoxy resin (A), dispersing (A) in water with addn. of emulsifier (B) and olefinic monomer(s) (D-1), and polymerising in presence of a radical initiator; and (ii) coatings obtd. by applying dispersion (I) to a substrate, followed by hardening.