The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 07, 2015
Filed:
Feb. 11, 2009
Stefan Schwiegk, Neustaft, DE;
Axel Wilms, Weisenheim, DE;
Ronald Frans Maria Lange, Gümlingen, CH;
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;
Stefan Schwiegk, Neustaft, DE;
Axel Wilms, Weisenheim, DE;
Ronald Frans Maria Lange, Gümlingen, CH;
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;
BASF SE, , DE;
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.