Patent ID: 8999211
Filing Date: 2015-04-07
Classification: B29C,C08J,Y10T

Abstract:
1. A process for producing porous structures selected from porous fibers, foils, films, coatings or moldings, from polyamide comprising: dissolving the polyamide in an ionic liquid and precipitating or coagulating the dissolved polyamide by contacting the solution with a liquid precipitant medium, wherein the polyamide is polyhexamethylene adipamide, polyhexamethylene sebacamide, or polycaprolactam, wherein fibers are produced from the dissolved polyamide in a wet-spinning process by precipitation in protic solvents, and subsequent freeze-drying, foils, films or coatings are produced by blade coating the dissolved polyamide onto a substrate surface, dipping into a precipitation or coagulation bath, subsequent freeze-drying of the resulting foil, of the film or of the coated substrate and moulded parts are prepared by extracting the dissolved polyamide with protic solvents, wherein the dissolved polymer is transformed to a solid or wax-like state by cooling and extracted after subsequent moulding.