Back to results
US 4,997,900 AGranted
Powder coating comprising acetone oxime blocked diisocyanate and polyester
AssigneeCargill, Incorporated
InventorLarry F. Brinkman
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeCargill, Incorporated
InventorLarry F. Brinkman
Estimating the term…
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.
A powder coating composition which is heat curable at below about 150.degree. C. for use in the preparation of protective films comprising tetramethylxylene diisocyanate having the isocyanate groups thereof substantially blocked with acetone oxime, the blocked isocyanate having a Tg greater than about 35.degree. C. and a hydroxylated polyester having a Tg of greater than about 50.degree. C.
A powder coating composition which is heat curable at below about 150.degree. C. for use in the preparation of protective films comprising a polyisocyanate prepolymer derived from the reaction of tetramethylxylene diisocyanate and a polyol wherein the isocyanate groups are substantially blocked with acetone oxime, the prepolymer having a Tg greater than about 35.degree. C. and a hydroxylated polyester having a Tg of greater than about 50.degree. C.
Dependencies are inferred from the claim text.