Process for the preparation of lightweight, planar molded articles

US4812368A · kind A · utility

Assignee

• BASF SE

Inventors

• Dietrich Scherzer · Neustadt, DE
• Erwin Zahn
• Wolfram Frank · Heidelberg, DE

Key dates

• Filing date: Dec 23, 1987
• Grant date: Mar 14, 1989
• Expiry date: Dec 23, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/26
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The subject of this invention is a process for the preparation of lightweight, planar molded articles, e.g. those having a thickness from 0.1 to 40 mm and having a density of 0.015 to 0.25 g/cm.sup.3, by treating porous materials, preferably open celled or flexible or semi-rigid polyurethane foams, with an effective amount of an aqueous dispersion or emulsion of organic compounds containing NCO groups and allowing the isocyanate compound to cure, optionally while molding, at a temperature from 25.degree. C. to 180.degree. C. and optionally at a pressure of 1 to 50 bar. The invention also relates to molded articles prepared according to this process which have special mechanical properties.