| 摘要 |
The invention provides a process for preparing an aqueous binder composition which comprises (a) dispersing pigment powder having a particle size less than 20 micrometers in a liquid, solvent-free epoxy resin, (b) dispersing the resultant paste in water, (c) reacting the resultant dispersion with a secondary amine, and optionally a primary amine, the amount of amine or amines being sufficient to provide at least one N-H function per epoxy group of the epoxy resin, at a temperature in the range 40 DEG C. to 100 DEG C., and (d) neutralizing the resulting suspension of epoxy-amine adduct coated particles, and (e) optionally adjusting the concentration of the resulting dispersion within the range 35 to 75% w solids by addition of water. Aqueous paint compositions are prepared from the binder compositions by (f) adding a crosslinking agent, and (g) adjusting, if necessary the concentration of the composition by addition of water to ensure a solids content in the range 10 to 65% w.
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