Process for producing a crosslinking component for cationic...

Details Process for producing a crosslinking component for cationic... Process for producing a crosslinking component for cationic...

C - Chemistry, Metallurgy

09

D

402/143, 400/740

C09D 5/44 (2006.01) C07C 273/18 (2006.01)

Patent

CA 1243144

ABSTRACT OF DISCLOSURE Crosslinking components for cationic paint binders carrying hydroxy and/or primary amino groups, preferably based on epoxy-amine adducts, prepared by reacting .beta.-hydroxyamines with isocyanate compounds and with formaldehyde at from 80 to 130°C are described. Optionally, the crosslinking component, if containing hydroxy groups, can be further reacted with semi-blocked diisocyanates and/or .alpha., .beta. -ethylenically unsatur- ated monoisocyanates. Cationic paint binders, in conjunction with the crosslinking component, can be cured at temperatures of from 150°C upwards. The structure of the crosslinking com- ponent imparts enhanced adhesion of the coatings applied to a substrate particularly when applied as a cathodically electro- deposited primer.

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