Preparation of cathodic electrocoating binders

Chemistry of carbon compounds – Miscellaneous organic carbon compounds

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260 292TN, 204181C, 528 45, C08G 1880, C08G 1848, C08L 9100, C08J 304

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043158404

ABSTRACT:
A process for the preparation of self-crosslinking, cathodic electrocoating binders by reacting polyether-polyols, which may or may not contain thio groups, with semi-blocked diisocyanates or partially blocked polyisocyanates, wherein the reaction products (A), containing blocked isocyanate groups, are reacted with a polyamine (B), some of whose amino groups may or may not be in the form of ketimine groups, in such a way that one or more amino groups of the polyamine (B) form a urea group with a blocked isocyanate group of the reaction product (A), and the self-cross-linking reaction product of (A) and (B) is converted into a water-dilutable form in the conventional manner by protonization with an acid.
The coating binders prepared according to the invention may be used for cathodic electrocoating of metal articles.

REFERENCES:
patent: 3391097 (1968-07-01), Williamson
patent: 3947338 (1976-03-01), Jerabek et al.
patent: 3947339 (1976-03-01), Jerabek et al.
Condensed Chemical Dictionary, 5th Ed. (Reinhold, N.Y.) 1956, p. 228.
Baked Polyurea Coatings by George A. Hudson et al., Official Digest, Feb. 1960, pp. 213-221.

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