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:
Jul. 21, 1998
Filed:
Feb. 06, 1997
Shigeru Nakajima, Okayama, JP;
Mitsuru Wakitani, Okayama, JP;
Japan Exlan Company Limited, Osaka, JP;
Abstract
Disclosed are acidic or basic gas absorptive fiber having both a degree of acidic gas absorption of 70% or higher and a degree of basic gas absorption of 80% or higher, and also fabric comprising the fiber. The fiber and fabric, after having absorbed acidic and basic gases, can easily be restored to its original condition if they are exposed to clean air. The fiber is preferably crosslinked acrylic fiber, which has a specific increase in its nitrogen content resulting from crosslinking with hydrazine, a specific amount of carboxyl groups resulting from modification with nitrile groups, a specific ratio of free carboxyl groups to all carboxyl groups existing therein, and a specific equilibrated pH in water, and which is prepared from acrylic fiber through crosslinking with hydrazine, hydrolysis, and conversion of carboxyl groups therein into metal carboxylate groups. The fiber and fabric are durable to cycle use.