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:
Oct. 16, 2001
Filed:
Oct. 07, 1999
Denis Cottevieille, Montreuil sous Bois, FR;
NWXANS, Paris, FR;
Abstract
The invention provides a method of manufacturing polyaniline having magnetic properties and improved non-linear electrical properties, starting from neutral polyaniline, the method comprising the following steps: the neutral polyaniline is dissolved at a concentration of 0.1 to 3 parts per hundred by weight in a solution of fuming sulfuric acid including, at a concentration lying in the range 0.1 to 10 parts per hundred by weight, a magnetic metal, a magnetic metal salt, or any mixture of such metals and/or metal salts that is soluble in fuming sulfuric acid; the solution is maintained under stirring for a length of time lying in the range 10 minutes to 72 hours; the solution is poured slowly into methanol or distilled water to obtain a precipitate of magnetic self-doped polyaniline; and the precipitation cake is washed until the washing solution has neutral pH, and said precipitation cake is dried.