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. 11, 2001
Filed:
Jan. 08, 1999
Katsuya Shimizu, Nobeoka, JP;
Hiroshi Tomiyama, Nobeoka, JP;
Asahi Kasei Kabushiki Kaisha, Osaka, JP;
Abstract
The present invention provides polyhexamathylene adipamide fibers significantly excellent in thermal yellowing resistance, and a process for producing the same. The improved polyhexamethylene adipamide fibers have adaptability to fibers for clothing which adaptability is comparable to that of poly-&egr;-capramide fibers and polyester fibers. The improved polyhexamethylene adipamide fibers can be obtained by either (1) melt spinning a polyhexamethylene adipamide simultaneously containing 2,4-bis(alkylthio)-6-(3,5-dialkyl-4-hydroxyanilino)-1,3,5-triazine and a compound selected from the group consisting of phosphorous acid, hypophosphorous acid and derivatives of these acids, or (2) melt spinning the fibers having the sum of an amino end group concentration ([—NH,)]) and a carboxyl end group concentration ([—COOH]) of 70 to 200 meq/kg, satisfying the condition: [—COOH]≦60 meq/kg, and containing from 0.005 to 0.5% by weight of an alkali metal compound, or (3) melt spinning under conditions wherein the melt spinning in (1) and that in (2) are combined.