Prepolymers containing isocyanate groups and a method for the production thereof

US6495652B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Michael Reichelt · Ruhland, DE
• Udo Rotermund · Ortrand, DE
• Renate Hempel · Ruhland, DE
• Peter Falke · Schwarzheide, DE
• Peter von Malotki · Cosel, DE
• Holger Seifert · Bad Driburg, DE

Key dates

• Filing date: Oct 9, 2000
• Grant date: Dec 17, 2002
• Expiry date: Oct 9, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2110/0083
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Prepolymers which contain isocyanate groups, have an NCO content of at least 30.0% by weight and can be prepared by reacting an isocyanate mixture consisting predominantly of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates and having a proportion of two-ring isomers of not more than 74% by weight with at least 4-functional polyols or a mixture of polyols having a mean functionality of at least 4, where the polyols or polyol mixtures have a hydroxyl number of from 200 to 1650 mg KOH/g and a number average molecular weight of less than 1100 g/mol. The present invention also provides a process for preparing these prepolymers containing isocyanate groups, provides for their use for producing polyurethanes and provides a process for producing polyurethanes by reacting at least one novel prepolymer containing isocyanate groups, if desired in admixture with further organic and/or modified organic isocyanates (a), with compounds having at least two reactive hydrogen atoms (b) in the presence of, if desired, blowing agents (c), catalysts (d) and, if desired, further auxiliaries and/or additives (e).