Process for producing self-crosslinking cationic paint binders

Details Process for producing self-crosslinking cationic paint binders Process for producing self-crosslinking cationic paint binders

C - Chemistry, Metallurgy

08

G

402/43, 400/5411

C08G 18/54 (2006.01) C08G 18/08 (2006.01) C08G 18/80 (2006.01) C08G 18/83 (2006.01) C08G 59/12 (2006.01) C08G 59/14 (2006.01) C08G 59/62 (2006.01) C09D 5/44 (2006.01) C09D 163/00 (2006.01) H01B 3/40 (2006.01)

Patent

CA 1271590

ABSTRACT OF DISCLOSURE A process for producing self-crosslinking cationic paint binders, water-dilutable upon protonation, on the basis of urea and urethane group carrying reaction products of modified phenols and monoepoxy compounds as well as with the binders produced according to this process and their use in stoving paints, particularly electrodeposition paints are described. The process is characterized in that a substituted urea-phenol-formaldehyde condensate obtained through reaction of an aminoalkylation product of a phenol, carrying an average of at least one secondary amino group with a semi-blocked di- isocyanate, or a substituted urea prepared from a semi-blocked diisocyanate and an amine and further reacted with formalde- hyde and a phenol, is reacted with a monoepoxy compound, the free aliphatic hydroxy groups of the reaction product being reacted in a further reaction step with di- or polyisocyana- tes. The paints formulated with these products, at stoving temperatures of from 150 to 170°C, give films with excellent corrosion resistance and adhesion.

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