Blocked isocyanate and method of manufacture thereof

Details Blocked isocyanate and method of manufacture thereof Blocked isocyanate and method of manufacture thereof

C - Chemistry, Metallurgy

07

C

260/452, 400/510

C07C 271/60 (2006.01) C08G 18/28 (2006.01) C08G 18/76 (2006.01) C08G 18/80 (2006.01) C09D 5/03 (2006.01)

Patent

CA 2006301

ABSTRACT OF THE INVENTION In accordance with the present invention, a blocked isocyanate composition which is useful as a curing agent for powder coatings is prepared from the reaction of tetramethylxylene diisocyanate and acetone oxime. In a preferred embodiment, a polyol is reacted with the isocyanate to provide a prepolymer with urethane linkages wherein the isocyanate groups of the prepolymer are substantially blocked with acetone oxime. The blocked isocyanate composition of the present invention can be used as a curing agent for powder coatings, adhesives and high solid coatings which are cured by baking. The blocked isocyanate composition of the invention can be used as a cross-linking agent for a hydroxy-containing polyester, a hydroxy-containing acrylic or methacrylic polymer or any other active hydrogen containing polymer.

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