| abstract |
Disclosed are: a binder composition, a coating agent based on the said binder composition, and the use of the composition, in particular for multiple-layer coatings. The binder composition contains the following components: (A) 25-75 wt. % reaction product of one or more carboxy-functionalised (meth)acrylic copolymers containing urethane groups, and/or one or more carboxy-functionalised polyesters containing urethane groups, each with an acid number of 30-200 mg KOH/g, with one or more lactones; (B) 25-75 wt. % one or more epoxy-functionalised cross-linking agents with at least two epoxy functions in the molecule, with a number average molecular weight (Mn) of 200 to 10,000 g/mole; (C) 0-60 wt. % one or more polyols with at least two hydroxyl functions in the molecule; (D1) 0-20 wt. % one or more melamine resins; (D2) 0-40 wt. % one or more free or capped polyisocyanates (the sum of the weight percentages of components A, B, C, D1 and D2 being 100); and (E) 0-10 wt. % (relative of the sum of the weights of components A-D2) one or more catalysts for catalysing the reaction of carboxyl- and epoxy groups. |