Method for producing foamed polymer molded bodies and said foamed polymer molder bodies

US7429420B2 · kind B2 · utility

Assignee

• Membrana GmbH · DE

Inventors

• Frank Wiese · Huntsville, US
• Hartmut Stenzel · Obernburg, DE
• Quan Huang · Schwelm, DE
• Bernd Seibig · Geesthacht, DE
• Dieter Paul · Neunkirchen, DE

Key dates

• Filing date: Apr 30, 2003
• Grant date: Sep 30, 2008
• Expiry date: May 10, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2982
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Method for producing foamed microporous polymer molded bodies by melting a thermoplastic polymer in a first zone of an extrusion device, mixing in a highly volatile blowing agent, conveying the polymer melt containing the blowing agent into a second zone in which dissolution of the blowing agent occurs to saturation of the polymer melt at the foaming temperature, and molding and foaming of the loaded polymer melt to a foamed structure, whereby, in the second zone, a pressure above 90 bar, a blowing agent concentration above the critical minimum concentration for complete foaming, and the foaming temperature, lying above the solidification temperature of the polymer melt saturated with blowing agent, are set such that the polymer molded body obtained has a porosity in the range between 40 and 90 vol. % and an open-cell pore structure with uniform cross-sectional distribution. Foamed microporous polymer molded bodies in the form of particles comprising a thermoplastic polymer with uniform open-cell pore structure, a porosity of 40 to 90 vol. %, an accessible proportion of pore volume of at least 0.75 and an average cell size between 1 and 100 μm.