| abstract |
Crosslinking components (I) for OH and/or prim. or sec. amino gp.-contg. cationic paint binders (II) are produced by reaction of (n) mols. di-isocyanate cpd. (III) with (n + 1) mols. OH gps. of mono-hydroxy-functional cpd(s). (IV) pref. a mono-alcohol and/or ketoxime, with formation of urethane and allophanate gps., at 30-140 deg.C in the presence of a basic catalyst, until the NCO gps. are completely reacted; n = 2 or more, pref. 2-10. (III) is e.g. HMDI, IPDI, TDI, etc.; blocking agent (IV) is e.g. 2-ethylhexanol, ethylene glycol monomethyl ether, MEK-oxime,!etc.;!(II)!are!based!on,!e.g.!epoxide-amine!adducts. |