Blocked polyisocyanates

US5523377A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Eberhard Konig · Kronberg, DE
• Theodor Engbert · Recklinghausen, DE
• Thomas Klimmasch · Leverkusen, DE
• Manfred Bock · Leverkusen, DE

Key dates

• Filing date: Nov 8, 1994
• Grant date: Jun 4, 1996
• Expiry date: Nov 8, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/8096
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Blocked (cyclo)aliphatic polyisocyanates wherein 30 to 70 equivalent-% of the isocyanate groups are blocked with butanone oxime, 30 to 70 equivalent-% of the isocyanate groups are blocked with 1,2,4-triazole and 0 to 30 equivalent-% of the isocyanate groups are blocked with other blocking agents; a method for their preparation by blocking lacquer polyisocyanates with these blocking agents, optionally with the prior, simultaneous or subsequent modification of the polyisocyanates with hydrazine derivatives containing one or more isocyanate-reactive groups; and the use of the blocked polyisocyanates as cross-linking agents for organic polyhydroxy compounds in one-component polyurethane stoving compositions.