Process for the preparation of polyurethane resins and their use and the use of ethoxyethyl propionate for the preparation of polyurethane resins

US6372875B1 · kind B1 · utility

Assignee

• BASF COATINGS GMBH · DE

Inventors

• Bernd Mayer · Graz, AT
• Michael Grabbe · Wylie, US
• Heinz-Peter Rink · Hachenburg, DE
• Uwe Meisenburg · Duisburg, DE

Key dates

• Filing date: Jan 22, 1996
• Grant date: Apr 16, 2002
• Expiry date: Jan 22, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31605
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the preparation of polyurethane resins, in which, in an ester as solvent,a) at least one compound having 2 hydroxyl and/or amino groups,b) at least one di- and/or polyisocyanate,c) at least one compound containing 2 groups which are reactive toward isocyanate groups, these compounds containing, at least in part, at least one group capable of forming anions which is neutralized before or after incorporation of component (c) into the polyurethane molecule, andd) at least one compound having at least 3 hydroxyl and/or amino groupsare used to prepare a polyurethane resin, preferably using components (a), (b) and (c) to prepare an intermediate which has terminal isocyanate groups and at least some of whose free isocyanate groups are subsequently reacted with component (d), characterized in that ethoxyethyl propionate is employed as solvent.