Epoxy and epoxy-polyacrylate dispersions containing reactive diluent, processes for their production, and their use

摘要

Aq., low-solvent coating material, contains: (I) a base resin dispersion comprising: (A) an epoxy resin obtd. by condensation of: (A-1) 50-95 wt% epoxide(s) with at least 2 epoxide gps.; and (A-2) 5-50 wt% aromatic polyol; (B) a dispersant comprising: (B-1) a condensation prod. of: (B-11) an aliphatic polyol with a mol. wt. (Mw) of 200-20,000 g/mol; and (B-12) an epoxide cpd. with at least 2 epoxide gps.; (C) a diluent comprising: (C-1) low-mol. wt. liq. epoxy-functional cpds.; and (D) water., together with: (II) an aq. hardener for (I) which is suitable for hardening at room temp. or elevated temp. (forced drying). The amts. of components (I) and (II) are such that the ratio of the number of reactable epoxide gps. in (I) to the number of amine H atoms in (II) is (1:0.75)-(1:2.0). Also claimed are: (i) a process for the prodn. of aq. modified epoxy resin dispersions (I); (ii) aq. low-solvent coating material obtd. by this process; (iii) coatings produced with coating material; and (iv) matt clear-coat compsns. and water-dilutable adhesives contg. aq. dispersions as above.