DRAWING OF AROMATIC POLYAMIDE FIBER - Patent Application Publication Kokai 59-192713 - Specification

Sep 21, 2026

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Japanese Patent Application Publication Kokai 59-192713 describes a method for heat drawing aromatic polyamide fiber by flowing drawing an unstretched filament at temperatures above 300°C in an inert gas atmosphere. The approach aims to produce high-strength and high-modulus fibers while preventing a neck formation typical of flow drawing. Prior drawbacks include low bending resistance and weak twisted-cord strength after conventional high-temperature high-draw-ratio heat drawing, which this invention targets for improvement by specific inert-gas and structural-unit constraints.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages26

Reading Time1 h 6 min

AccessFree to download

Specification

Claims

Detailed Description of the Invention

(a)Field of Application for the Invention

(b)Prior Technology

(c)Objective of the Invention

(d)Structure of the Invention

C Segawa,Yasuhiko Drawing of aromatic polyamide fiber /byYasuhiko Segawa and others.11 p.:il1. Patent(Japanese)No.59-192713(1984). Filed: TRANSLATION NO.4590. ■ TRANSLATION PATENT BUREAU OF JAPAN OFFICIAL GAZETTE FOR UNEXAMINED PATENTS Japanese Patent Application Publication Kokai:59-192713 Publication Date: November 1,1984 +Number of Inventions: 1 Request for Examination:(Not yet requested) (Total of 6 pages) Dnt c1630 entification CodeD 02 J 1/226613-4L DRAWING OF AROMATIC POLYAMIDE FIBER Application No.:58-66915 Application Date: April 18,1983 Inventors:Yasuhiko Segawa c/o Teijin Co.Ltd.Production Technology Research Laboratory,2-1 Hinode-machi,Iwakuni-shiNaosaburo Hiratsukasame addressNorihisa Yamaguchisame address Applicant:Teijin Co.Ltd.1-11 Minamihon-machi,Higashi-ku,Osaka-shi Patent Attorney: Yoshihiro Maeda # Specification 1. Title of Invention DRAWING OF AROMATIC POLYAMT DE FIBER 2. Claims (1)A method of drawing an aromatic polyamide fiber in which an unstretchedfilament of an aromatic polyamide fiber is heat drawn while the saidunstretched filament is flow drawn at a temperature of above 300℃ in an inertgas atmosphere. Digitized by the Internet Archivein 2017 https://archive.org/details/drawingofaromati00sega (2)The method of drawing an aromatic polyamide fiber described in scope(1)of the patent claim in which the inert gas is heated steam. (3)The method of drawing an aromatic polyamide fiber described in scope(1)or scope(2)of the patent claim in which the aromatic polyamide fiberconsists of an aromatic copolyamide constructed from repeating units of -NR,-Ar,-NR₁-co-Ar,-co-及U/又は-NR,-Ar,-C0一or (where R₁,R₂and R₃are hydrogens and/or low molecular weight alky¹groupsand Ar1,Ar₂and Ar₃are ar omatic radicals selected from the followingradicals. Wheresa me time,the hy drogen atoms of thearomatic radical may be substituted with halogen atoms and/or low molecularweight alkyl groups.) (4) The method of drawing an aromatic polyamide fiber described in scope(3)of the patent claim in which more than 80 mole%of Ar1,Ar2 and Ar3 consistsof the following aromatic radicals 1A)-。0(6 (where the hydrogen atoms in the aromatic radical may be substituted withhalogen atoms and/or low molecular alkyl groups)and the mole%of thestructural unit(B)is between 10 and 40%. (5)The method of drawing an aromatic polyamide fiber described in scope(3)or scope(4)of the patent claim in which R₁,R2 and R³are all hydrogenatoms. # 3.Detailed Description of the Invention ## (a)Field of Application for the Invention This in vention deals with a method of heat drawing an aromatic polyamidefiber.More specifically,this invention deals with a method of drawing which can produce an aromatic pol yamide fiber with a high strength and high modulusthrough a flow drawing under a high draw ratio after raising the temperatureof an unstretched filament of the aromatic pol yamide fiber to a temperatureabove 300℃. ## (b)Prior Technology Recent1y,more and more demands are ma de on synthetic fibers. Variousnovel fiber materials have been developed particularly in respon se to thedemand for high strength and high modulus. Of these novel materials,aromatic polyamide fiber is a fiber made frompara-oriented aromatic copol yamide which will be described later. In order tobring out its performance,the fiber is converted to a drawn filament withhigh strength and high modulus by heat drawing it at a high draw ratio at ahigh temperature. In this pr ocess,the unstretched filament is graduallydrawn without generating a neck in a so called flow drawing process. However,the aromatic polyamide fiber heat drawn at this high temperatureand this level of high draw ratio has the problem of having low bendingresistance,especially having a low twisted cord strength. ## (c)Objective of the Invention The objective of this invention is to improve upon the loss of be ndingres

FAQs

What is the core method described for drawing the aromatic polyamide fiber?

Heat drawing is performed by flow drawing an unstretched aromatic polyamide filament at a temperature above 300°C in an inert gas atmosphere.

What technical problem does the invention aim to solve?

It improves the loss of bending resistance, especially the strength loss of a twisted cord formed after conventional high-temperature, high-draw-ratio heat drawing.

What inert gas-related condition is specified in the claims?

The inert gas can be heated steam in one of the claimed method variations.

Sep 21, 2026

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