公开(公告)号：EP0904160B1

公开(公告)日：2003-08-20

申请号：EP97927139.2

申请日：1997-06-05

申请人： E.I. DU PONT DE NEMOURS AND COMPANY

发明人： WETZEL, Kornelia ,  BOLLENBERG, Ingrid ,  DÖSSEL, Karl-Friedrich ,  JÖLLENBECK, Manfred ,  WINDMANN, Reinhard ,  KEGEL, Heinz-Günter

IPC分类号： B05D7/16 ,  B05D7/00

CPC分类号： B05D7/577 ,  C09D5/4465

摘要： A process for multi-coat painting by the electrophoretic application of a primer on a conductive substrate, stoving the primer coat obtained, coating with a colouring and/or effect-providing undercoat and application of a coat of clear lacquer and stoving the undercoat and clear lacquer topcoat, in which a colouring and/or effect-providing undercoat on an aqueous base is applied directly to the stoved primer without the application of other intermediate coats, said undercoat containing one or more water-dilutable binders and one or more polyisocyanates with free or blocked isocyanate groups, where the hydroxyl number of the binder solids in the aqueous undercoat is 10 to 300 mg KOH/g and the ratio of the number of free or blocked NCO groups to that of the hydroxyl groups arising from the binder solids is over 0:5:1 and under 5:1.