Process for coating electrically conducting substrates,...

Details Process for coating electrically conducting substrates,... Process for coating electrically conducting substrates,...

C - Chemistry, Metallurgy

09

D

400/7932, 400/79

C09D 5/44 (2006.01) C08G 59/14 (2006.01) C08L 63/00 (2006.01)

Patent

CA 1338228

The invention relates to a cathodic electrocoating proc- ess,which uses electrocoating baths which contain a cat- ionc amine-modified epoxy resin otainable by reacting (A) a diepoxy compound of an epoxy equivalent weight below 2000 (B) a compound monofunctionally reactive toward the epox- ide groups and containign an alcoholic OH group, a phenolic OH group or an SH group, and (C) an amine, the components (A) and (B) being used in a molar ratio of 10:1 to 1:1, preferably 4:1 to 1.5:1 and the positive charges being introduced by protonization of the reaction product and/or by use of amine salts as the component (C). The electrocoating baths used are distinguished by con- taining at least 7.5 % by weight of a polyoxyalkylenepoly- amine, the percentage by weight referring to the total amount of binders contained in the electrocoating bath.

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