Polyfunctional isocyanates free of alkali and urea groups
AssigneeAkzona Incorporated
InventorsHans Zengel, Rainer Zielke, Manfred Bergfeld
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Abstract
This invention relates to a polyfunctional isocyanate which is an acrylamide or methacrylamide homopolymer or interpolymer having 20 to 100% of its secondary .alpha. and tertiary .alpha. carbon atom amide groups converted to isocyanate groups, said polyfunctional isocyanate being free of alkali and urea groups. The polyfunctional isocyanates are prepared by reacting the N-chloramide derivative of the acrylamide or methacrylamide polymer, in an inert solvent, with a tertiary amine having a pK.sub.a value of more than 7. The polyfunctional isocyanates are useful for forming coating compositions.
Claims15
A polyfunctional isocyanate which is an acrylamide or metharylamide homopolymer or interpolymer having 20 to 100% of its secondary .alpha. and tertiary .alpha. carbon atom amide groups converted to isocyanate groups, said polyfunctional isocyanate being free of alkali and urea groups.
A process for the preparation of polyfunctional isocyanates which comprises reacting an N-chloramide group containing derivative of an acrylamide or methacrylamide homopolymer or interpolymer with a tertiary amine having a pK.sub.a value of more than 7, in the presence of an inert solvent, at a temperature of from about 20.degree. C. to about 180.degree. C.
Dependencies are inferred from the claim text.