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:
Sep. 23, 2014
Filed:
Nov. 13, 2008
Eric Uerdingen, Speyer, DE;
Michael Siemer, Mannheim, DE;
Michael Lutz, Speyer, DE;
Thomas Wisniewski, Bensheim, DE;
Frank Hermanutz, Leonberg, DE;
Frank Gaehr, Esslingen, DE;
Eric Uerdingen, Speyer, DE;
Michael Siemer, Mannheim, DE;
Michael Lutz, Speyer, DE;
Thomas Wisniewski, Bensheim, DE;
Frank Hermanutz, Leonberg, DE;
Frank Gaehr, Esslingen, DE;
BASF SE, Ludwigshafen, DE;
Abstract
The invention relates to a method for producing regenerated biopolymers in the form of carbohydrates, using a solvent system that contains the biopolymers dissolved therein. The solvent system is based on a melted ionic liquid and optionally a protic solvent or a mixture thereof. The biopolymers dissolved in the solvent system are precipitated in a coagulation medium, said medium comprising a protic coagulant or a mixture of protic coagulants. The method according to the invention is characterized in that the surface tension σ of the coagulant or the mixture of coagulants is 99% to 30% of the surface tension σ of water, the surface tension being measured according to ASTM D 1590-60 at a temperature of 50° C. The method according to the invention is economical and flexible and leads to advantageous products, especially in the form of staple fibers which are especially not fibrillated and have an advantageous wet to dry strength ratio.