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:
Apr. 01, 1997
Filed:
Jan. 13, 1994
Applicant:
Inventors:
Richard Neuert, Winkelhaid, DE;
Georg-Emerich Miess, Regensburg, DE;
Assignee:
Hoechst AG, Frankfurt, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F / ; D06M / ;
U.S. Cl.
CPC ...
528480 ; 528488 ; 528489 ; 524-5 ; 811551 ; 811554 ; 811569 ; 428395 ; 4284111 ;
Abstract
A process for maintaining or increasing the tensile strength of fibers of aromatic copolyamides which are formed from a major portion of para-monomers and are soluble in organic aprotic and polar solvents. The process involves storing the fibers in alkaline media after production by wet or dry spinning processes, after treatment of the dry or wet spun fibers, and storing the fibers in an aqueous environment having a pH of at least 10. The tensile strength of the fibers is retained or increased.