Polyfunctional isocyanates free of alkali and urea groups

US4301257A · kind A · utility

Assignee

• Akzona Incorporated · US

Inventors

• Hans Zengel · Kleinwallstadt, DE
• Rainer Zielke
• Manfred Bergfeld · Zell am Harmersbach, DE

Key dates

• Filing date: Mar 13, 1980
• Grant date: Nov 17, 1981
• Expiry date: Mar 13, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2810/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

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.