VERFAHREN ZUR BESCHICHTUNG ELEKTRISCH LEITFÄHIGER SUBSTRATE.

摘要

PCT No. PCT/EP90/00843 Sec. 371 Date Dec. 11, 1991 Sec. 102(e) Date Dec. 11, 1991 PCT Filed May 25, 1990 PCT Pub. No. WO90/15108 PCT Pub. Date Dec. 13, 1990.The invention relates to a cathodic electro-dipcoating process, wherein the electro-dipcoating composition used contains a cationic, amine-modified epoxy resin, which is obtainable by reacting (A) a polyepoxide, (B) an amine and (C) an adduct, which is obtainable by . . . (sic) (c1) a polyether- or polyester-polyol, (c2) a polyisocyanate and (c3) a compound which contains at least one hydrogen atom which is reactive towards isocyanate groups and at least one ketimine group in the molecule, and/or (D) a hydrolysis product of (C) with one another in a relative proportion such that 20 to 90% of the epoxy groups of component (A) are reacted with component (B) and the remaining epoxy groups are reacted with component (C) and/or (D), and-if still necessary-at least partially protonating the reaction product thus obtained.