Method for producing porous structures from synthetic polymers

US8999211B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Stefan Schwiegk · Hamburg, DE
• Axel Wilms · Bad Dürkheim, DE
• Ronald Frans Maria Lange · Ludwigshafen, DE
• Michael Siemer · Mannheim, DE
• Giovanni D'Andola · Heidelberg, DE
• Volker Rauschenberger · Eisenberg, DE
• Frank Hermanutz · Leonberg, DE
• Frank Gaehr · Eßlingen, DE
• Julien Courtois · Ludwigshafen, DE
• Dirk Gerhard · Mannheim, DE

Key dates

• Filing date: Feb 11, 2009
• Grant date: Apr 7, 2015
• Expiry date: Aug 6, 2030

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/249976
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process for producing porous structures from polyamide by dissolving the polyamide in an ionic liquid and precipitating or coagulating the dissolved polyamide by contacting the solution with a liquid precipitant medium. Fibers are produced from the dissolved polyamide in a wet-spinning process by precipitation in protic solvents, in particular water, a C1-4-alkanol or mixtures thereof, and subsequent freeze-drying. Foils, films or coatings are produced by blade coating the dissolved polyamide onto a substrate surface, optionally spraying with protic solvent, in particular water, a C1-4-alcohol or mixtures thereof, dipping into a precipitation or coagulation bath, freeze-drying of the resulting foil, of the film or of the coated substrate. Molded parts are prepared by extracting the dissolved polyamide with protic solvents, preferably water, a C1-4-alcohol or mixtures thereof, wherein the dissolved polymer is transformed to a solid or wax-like state by cooling and extracted after subsequent molding.