Auxetic polyurethane and melamine foams by triaxial compression

US11759983B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Sebastian Richter · Esslingen am Neckar, DE
• Achim Besser · Ludwigshafen, DE
• Sebastian Alexander Weisse · Ludwigshafen am Rhein, DE
• Johannes Poppenberg · Wyandotte, US
• Johann Martin Szeifert · Mannheim, DE
• Markus Susoff · Kassel, DE
• Steffen Mayer · Lembruch, DE
• Markus Schuette · Melle, DE
• Heinz-Dieter Lutter · Diepholz, DE

Key dates

• Filing date: Sep 13, 2018
• Grant date: Sep 19, 2023
• Expiry date: Dec 16, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2375/04
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Described herein is a process for preparing a foam (FA) with a Poisson's ratio in the range of from −0.5 to 0.3, the method including the steps of providing a foam (F1) with a flow resistance in the range of from 3000 to 8000 Pas/m, determined according to DIN EN 29053, and subjecting the foam (F1) to thermoforming including triaxial compression, wherein the foam (F1) is not reticulated prior to step (ii). Also described herein is the foam obtained or obtainable according to the process and the use of the foam as, for example, an energy absorbing device, preferably in protective gear, furniture, cushions, in cleaning devices with improved rinse-out behavior, in shoe soles, or as sealing, insulating or anchorage providing material for example used in earphones, ear plugs or dowels, or as acoustic material.