Preparation of polyurethane foams modified with melamine-formaldehyde precondensates

US4367294A · kind A · utility

Assignee

• BASF SE

Inventors

• Klaus Hahn · Lampertheim, DE
• Peter Horn · Heidelberg, DE
• Matthias Marx · Fürstenfeldbruck, DE
• Heinz Weber · Uerdingen, DE
• Wolfram Weiss · Mutterstadt, DE
• Rolf Wurmb

Key dates

• Filing date: May 22, 1981
• Grant date: Jan 4, 1983
• Expiry date: May 22, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G12/32
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the preparation of polyurethane foams modified with melamine-formaldehyde precondensates, in which the precondensates employed are storage-stable, aqueous 40-85% strength by weight resin solutions which are obtained by condensing melamine with formaldehyde in a molar ratio of 1:1.1-1.75 in aqueous solution at a pH which, at least periodically, is above 8, and at from 60 to 130.degree. C., until one part by volume of resin solution can be diluted with from 0.5 to 4 parts by volume of water at 20.degree. C. without causing a persisting cloudiness.