Patent EP-0230031-A1 (EP)
Inventor: HONIG HELMUT DR
IPC: C09D5/44
Filed: 1986-12-20
Abstract: 1. Claims for the contracting states : BE, DE, FR, GB, IT, NL, SE Cathodically depositable aqueous electro-dipcoat surface coating containing amino-epoxy resins, aminopoly(meth)acrylate resins, amino-group-containing polybutadiene oils and/or amino-polyurethane resins, water-dilutable by protonation with acids, with an amine value of 30 to 150 and a hydroxyl number of 50 to 500 as binder, pigments, fillers, corrosion inhibitors, paint auxiliary agents, optionally catalysts and in an amount of up to 15% by weight, relative to the total weight of the surface coating, organic solvents, as well as compounds reacting with the binder with crosslinking on stoving above 110 degrees C, characterized in that the compounds reacting with the binder with crosslinking on stoving above 110 degrees C are a mixture of A) 90 to 10 parts by weight, relative to the total weight of A and B, of compounds or mixtures thereof which contain as functional groups one or two blocked isocyanate groups and/or groups capable of transesterification or transamidation, which at stoving temperatures above 110 degrees C react with the water-dilutable binder and have an average molecular weight (~M~n) of less than 1500 or, if these compounds only contain blocked isocyanate groups as functional groups, an average molecular weight (~M~n) of less than 750, and B) 10 to 90 parts by weight, relative to the total weight of A and B, of compounds or mixtures thereof which contain per molecule as functional groups at least three blocked isocyanate groups and/or groups capable of transesterification or transamidation, which at stoving temperatures above 110 degrees C react with the water-dilutable binder and have an average molecular weight (~M~n) of 750 to 10,000 or, if these compounds contain groups capable of transesterification or transamidation as functional groups, an average molecular weight (~M~n) of at least 1500, and that the content of organic water-insoluble, high-boiling solvents, relative to the total weight of the surface coating, is less than 5% by weight. 1. Claims for the contracting states : ES, AT Process for the coating of objects with electrically conductive surface by cathodic deposition of an aqueous electro-dipcoat surface coating containing amino-epoxy resins, amino-poly(meth)acrylate resins, amino-group-containing polybutadiene oils and/or amino-polyurethane resins, water-dilutable by protonation with acids, with an amine value of 30 to 150 and a hydroxyl number of 50 to 500 as binder, pigments, fillers, corrosion inhibitors, paint auxiliary agents, optionally catalysts and in an amount of up to 15% by weight, relative to the total weight of the surface coating, organic solvents, as well as compounds reacting with the binder with crosslinking on stoving above 110 degrees C, characterized in that the compounds reacting with the binder with crosslinking on stoving above 110 degrees C are a mixture of A) 90 to 10 parts by weight, relative to the total weight of A and B, of compounds or mixtures thereof which contain as functional groups one or two blocked isocyanate groups and/or groups capable of transesterification or transamidation, which at stoving temperatures above 110 degrees C react with the water-dilutable binder and have an average molecular weight (~M~n) of less than 1500 or, if these compounds only contain blocked isocyanate groups as functional groups, an average molecular weight (~M~n) of less than 750, and B) 10 to 90 parts by weight, relative to the total weight of A and B, of compounds or mixtures thereof which contain per molecule as functional groups at least three blocked isocyanate groups and/or groups capable of transesterification or transamidation, which at stoving temperatures above 110 degrees C react with the water-dilutable binder and have an average molecular weight (~M~n) of 750 to 10,000 or, if these compounds contain groups capable of transesterification or transamidation as functional groups, an average molecular weight (~M~n) of at least 1500, and that the content of organic water-insoluble, high-boiling solvents, relative to the total weight of the surface coating, is less than 5% by weight.