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:
Jan. 29, 2002
Filed:
Apr. 16, 1999
Michelin et Cie, Clermont-Ferrand Cedex, FR;
Abstract
The invention concerns an aqueous coagulating agent for a liquid crystal solution with a base of cellulose substances, characterized by the following: it contains water and at least one additive; when it is contacted with said solution, the diffusion kinetics (diffusion front D) of the coagulating agent and that of the precipitation (precipitation front P) of the cellulose substances by the action of said agent, measured under the microscope for the so-called “coagulation test” for an additive proportion of 20 wt. %, comply with the following relationship: 0.55 is <K /K ≦1, K and K being respectively the factors of diffusion and precipitation (respective “Fick” straight line gradients), expressed in &mgr;ms . The invention also concerns a method for spinning a solution of liquid crystal solution with a base of cellulose substances, in particular the method called the “dry-jet-wet-spinning” using a coagulating agent as per the invention as well as spun articles, fibers or films, obtained by this method.