Surface-coating binders based on a copolymer which contains tertiary amino groups and blocked isocyanate groups and is water-soluble or water-dispersible as a result of being at least partially salified with an acid. The copolymer contains, as copolymerized units, an olefinically unsaturated compound which possesses a tertiary amino group, an N-(1-alkenyl)-isocyanate which is blocked with a CH-, OH- or NH-acidic blocking agent, and another olefinically unsaturated compound, with or without one or more copolymerizable olefinically unsaturated compounds which possess hydrogen atoms which are reactive toward isocyanate groups, and has a mean molecular weight of from 1,000 to 20,000. The novel surface-coating binders are used for the cathodic electrocoating of metallic articles.
基于共聚物的表面涂层粘合剂,其中包含三级胺基和阻塞
异氰酸酯基团,并且由于至少部分与酸盐化而成为
水溶性或
水分散性。共聚物包含共聚单元,其中包括具有三级胺基的烯烃未饱和化合物,被CH-,OH-或NH-酸性阻断剂阻断的N-(1-烯丙基)-
异氰酸酯以及另一个烯烃未饱和化合物,带或不带一个或多个共聚能与
异氰酸酯基团反应的氢原子的未饱和化合物,其平均分子量为1,000至20,000。新型表面涂层粘合剂用于
金属制品的阴极电泳涂装。