WAESSRIGES,HITZEHAERTBARES UEBERZUGSMITTEL,DESSEN VERWENDUNG UND DAMIT BESCHICHTETE GEGENSTAENDE.

摘要

Binder for aq. heat curable coating material consists. of a mixt. of components (A) a base-neutralised carboxyl and/or phosphoric acid contg. epoxy, acrylic and/or polyester resin as base resin with an acid number of 15-175 and an average mol. wt. (Mn) of 1000-10000 and component (C), an aldehyde condensation resin as crosslinking agent, up to 20 wt. % of organic solvent and opt. additives such as pigments and/or fillers. New is a binder contg. (i) 85-40 wt. % component (A) (ii) 5-25 wt. % component (B), an epoxy resin graft polymer with an acid number of 30-200, prepd. from an epoxide gp.-free reaction product of fatty acid-free polyglycidyl ethers with more than 1.3 epoxide gps. per mol. and an epoxy equiv. wt. of 1000-3000, with alpha, beta-unsatd. monocarboxylic acids (iii) 5-40 wt. % component (C) consisting of completely etherified amino-formaldehyde and/or phenol-formaldehyde condensation resin with at least 2 reactive positions per molecule. Pref. the binder contains 75-45 wt. % (A), 10-20 wt. % (B) and 10-35 wt. % (C). Component (A) may be e.g. (a) an independently crosslinking, opt. (meth)acrylate resin contg. (alkyl)vinyl aromatics with an acid number of 20-120 and an OH number of 9-200, or (b) a fatty-acid free, phosphoric acid ester of an acid epoxy resin with an acid number of 15-150 prepd. from a polyglycidyl ether contg. epoxide gps. and/or polyglycidyl (meth)acrylate resin with more than 1.3 epoxide gpd./mol. and an epoxy equiv. of 180-2500, etc. 15-175.