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on the basis of a acrylatcopolymerisats ueberzugsmittel with hydroxyl, carboxyl and amine groups tertiaeren, method for the production of ueberzugsmittels and its use.
on the basis of a acrylatcopolymerisats ueberzugsmittel with hydroxyl, carboxyl and amine groups tertiaeren, method for the production of ueberzugsmittels and its use.
Coating compsn. consists of (A) an acrylate resin binder contg. OH, COOH andamino gps. (B) a polyisocyanate with at least 2 NCO gps./mol. as crosslinker, in amts. giving an NCO in (B) to OH in (A) ratio of 0.3-3.5:1, (C) organic solvent(s), (D) opt. pigments, fillers, usual ancillaries and additives and (E) opt. a cure catalyst. The novelty is that (A) is prepd. as follows; (I) An acrylate copolymer (F) contg. OH gps., with acid no. 5-30, pref. 8-25, is prepd. by copolymerisation of (a) 10-40., pref. 15-35 (wt.) % hydroxyalkyl alpha, beta-unsatd. carboxylate, (b) 0.1-8, pref. 0.5-4 % ethylenically unsatd. carboxylic acid and (c) 60-90 % other monomers with a polymerisable olefinically unsatd. double bond in an organic solvent, with addn. of polymerisation initiators; and (II) (F) is reacted with cpds. (G) contg. an average of 0.8-1.5, pref. 1 free NCO gp. and at least 1 tert.amino gp. per mol. in amts. such that (A) has an amine no. of 1-10, pref. 1-5.
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