Polyurethane compositions with a low content of diisocyanate monomer(s)

US7135128B2 · kind B2 · utility

Assignee

• Jowat AG · DE

Inventors

• Theodor Hippold · Bad Salzuflen, DE
• Dieter Guse · Löhne, DE
• Christian Terfloth · Detmold, DE

Key dates

• Filing date: Feb 21, 2003
• Grant date: Nov 14, 2006
• Expiry date: Apr 22, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2170/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

At least one isocyanate-reactive monomer is reacted with an excess of molten monomeric diisocynate to produce at least one reaction product and a maximum of 0.5 wt % of free isocyanate groups. The reaction product is then mixed with at least 20 wt. %, based on the total weight of reaction product, of at least one isocyanate-terminated prepolymer which is essentially free of diisocyanate monomers and has a viscosity at 20° C. of at least 1.500 mPa·s, the isocyanate-terminated prepolymer having a content of free NCO groups of up to 25 wt % and containing a maximum of 0.1 wt. % of diisocyanate monomer(s) based on the weight of the isocyanate-terminated prepolymer. A polyurethane composition containing less than 0.1 wt. % of monomeric diisocyanate, based on the total weight of the resulting polyurethane composition, is produced.