Binder for coating materials, esp. fillers and stoppers

摘要

A binder compsn. (I) contains (A1) 5-75 wt.% C-H acid cpds. obtd. by radical polymerisation of (A1.1) OH-functional and non-OH-functional unsatd. monomers in presence of (A1.2) polyols (opt. partly or completely in the form of esters with beta-ketocarboxylic acids) and (A1.3) aliphatic beta-ketocarboxylate esters, followed by transesterification of the OH gps. in the polymer and the polyols with the keto-esters, (A2) 0-60 wt.% C-H acid cpds. obtd. by transesterification of polyols with esters (A1.3), (B) 5-75 wt.% alpha, beta-unsatd. cpds. with at least two gps. of formula R1R2C=CR3-CO-, linked to other gp(s) of this formula via the residue of a di- or polyhydric alcohol, di- or poly-amine or aminoalcohol; R1-R3 = H and/or 1-10C alkyl (opt. with olefinic mono- or poly-unsaturation and/or OH gp(s)), (C) 3-40 wt.% polyglycidyl cpds., (D) 5-70 wt.% polyamine(s) with at least two opt. capped primary and/or secondary amine functions as hardener, (E) 0.01-10 wt.% (w.r.t. A + B + C + D + F) catalyst in the form of a Lewis or Bronsted base, the conjugated acid of the latter having a pKa value of at least 210, and (F) 0.01-10 wt.% polysiloxane cpd(s) of formula Y-(CH2)3-SiX3, Y = NH2, gp. of formula (i), -CH2-CH=CH2 or -CH2-CMe=CH2; X = OMe, OEt and/or OAc. Also claimed is (i) a coating material (II) contg. compsn. (I), organic solvents and/or water, pigments and/or fillers, and opt. conventional paint additives; (ii) a multilayer painting process comprising applying material (II) as a filler layer to an opt. primer-coated substrate, and then applying a basecoat and opt. a clearcoat, the layers being baked on separately or together.