Polyurethane prepolymer containing NCO groups

US6359023B1 · kind B1 · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Hermann Kluth · Goldkronach, DE
• Wolfgang Klauck · Meerbusch, DE
• Johann Klein · Goldkronach, DE
• Wilfried Huebner · Langenfeld, DE

Key dates

• Filing date: Feb 10, 1998
• Grant date: Mar 19, 2002
• Expiry date: Feb 10, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2200/0447
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Described is an NCO-group-containing polyurethane prepolymer madefrom polyisocanyates and polyols derived from natural oils. The invention is characterized in that the polyol is obtained by transesterification in the presence of basic lithium compounds. Together with a tertiary amine used to accelerate the moisture curing, the storage stability is thus increased considerably. Up to 4.0 mmol of the lithium compound is used per kilogram of polyol, and 0.1 to 2.0% by wt. of the amine, relative to the total weight of the composition, is used as the accelerator. The polyurethane prepolymer is suitable not only for the production of adhesives but also for the production of foamed materials, in particular those dispensed from throw-away pressure vessels.