PREPARATION OF CRIMPED COMPOSITE FIBER - Japanese Patent Publication Kokai 49-519 - Official Gazette

Sep 21, 2026

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Official Gazette material for an unexamined Japanese patent describes a method for preparing a crimped composite fiber. The fiber is formed from one polyamide component (polycapramide, polyhexamethylene adipamide, or polyhexamethylene dodecane diamide) combined with a ternary copolymer containing epsilon-caprolactam (6M), hexamethylene diammonium adipate (66 salt), and hexamethylenediamine salt of dodecane dibasic acid (612 salt). The disclosure specifies the required molar-ratio region on a triangular graph and process conditions for cospinning, drawing, and heat treatment to achieve high crimping ability and improved dimensional stability under wet, highly humid conditions.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages30

Reading Time1 h 16 min

AccessFree to download

Specification

Title of Invention

Claims

Detailed Description of the Invention

ceHonokoki,Hisao Preparation of crimped composite fiber /byHisao Honokoki and others.13 p.:ill. Patent(Japanese)No.49-519(1974).Filed:TRANSLATION NO.4597. S00 TRANSLATION PATENT BUREAU OF JAPAN # OFFICIAL GAZETTE FOR UNEXAMINED PATENTS Japanese Patent Application Publication Kokai:49-519 Publication Date: January 7,1974 Number of Inventions: Request for Examination:(Not yet requested) (Total of 7 pages) 6768abureau No.Japanese C2aification # PREPARATION OF CRIMPED COMPOSITE FIBER Application No.: 47-38678 Application Date: April 19,1972 Inventors:Hisao Honokoki2-634-97 Sakuragaoka,Nobeoka-shi,Miyazaki-ken and three others Applicant:Asahi Kasei Kogyo Co.Ltd.1-25-1 Dogashimadori,Kita-ku,Osaka-shi List of Appended Documents:(1) Specification1 copy (2)Figures1 cOPy (3)Copy of Application1 copy # Specification 1. Title of Invention PREPARATION OF CRIMPED COMPOSITE FIBER 2. Claims (1)A method of preparing a crimped composite fiber consisting ofpolycapramide,polyhe xamethylene adipamide or polyhexamethylene dodecanediamide as one component and a ter nary co polymer containing epsilon-caprolactam(6M),hexamethylene diammonium adipate(66 salt)and hexamethylenediamine salt of dodecane dibasic acid(612 salt)as other component,having apercentage composition(molar ratio)of aforementioned 6M:66 salt:612 salt inthe area indicated by the region in a triangular graph bound by straight lines Digitized by the Internet Archivein 2019 https://archive.org/details/preperationofcri00hono with coor dinates 20:60:20,30:50:20,30:20:50,20:20:60,1:39:60 and 1:60:39.This ternary copolymer is cospun,drawn and heat treated under the followingconditions. c>20 d+40≤T≤M-20F≥5 where C is crimping shrinkage(%),D is the temperature at which crimping isachieved(℃),T is heat treatment temperature(℃),M is the melting point ofthe copolymer(C)and Pis a parameter which indicates the amount of heatgiven to the fiber when it is heat treated. # 3. Detailed Description of the Invention This invention deals with a method of preparing a composite fiber fromtwo types of polymers ca pable of forming fibers with different shrinkageratios.In this invention such polymers are bonded to each other over theentire length of the monofilament fiber and the fiber obtained has anexcellent dimensional stability when wet. Thus,this invention presents apolyamide type composite fiber with good crimping. Prior to this invention,the production of a composite fiber from ahomopolyamide such as nylon-6 or nylon-66 as one component and a binarycopolymer of same polyamide system as the other component has been describedin Japanese Patents 41-6291,41-14611 and 40-15847. With a recentdiversification in the application of composite fibers,some application wasfound to demand a better crimping performance than otherwise available fromthe existing composite fibers. Based on these changing needs,the applicants developed crimped fiberspresented in Japanese Patents 45-19404 and 45-20125 which are better than thecrimped fibers of the prior art.The crimped fibers pre sented in thesepatents contained a ternary copolymer consisting of epsilon-caprolactam(6M), he xamethylene diammonium adipate(66 salt)and hexamethylene diammoniumterephthalate(6T)in specific proportions as one component. The use of sucha ternary copolymer made it possible to obtained a greater difference in theshrinkage ratio of two components and also yielded fibers with better crimpingability. Withfurther investigation,the inventors disco vered that not al1 of theproperties of this crimped fiber was satisfactory.For example,this fiberlacked the dimensional stability when severely wet.That is to say,the useof aforementioned ternary copolymer yielded a crimped fiber with much improvedcrimping ability but the internal structure of the fiber was much moredisorganized by the use of the said ternary copolymer and the crimped form wasstretched when the humidity was very high

FAQs

What materials are used as the two components in the composite fiber preparation?

One component is a polyamide such as polycapramide (nylon-6), polyhexamethylene adipamide (nylon-66), or polyhexamethylene dodecane diamide (nylon-612). The other component is a ternary copolymer made from epsilon-caprolactam (6M), 66 salt, and 612 salt in specified proportions.

What determines whether the ternary copolymer composition is acceptable?

The molar ratio of 6M:66 salt:612 salt must fall within the region defined in the triangular graph (Figure 1), including the points and shaded areas described in the disclosure.

How does the invention improve dimensional stability under wet and highly humid conditions?

The disclosure teaches that excellent crimping ability with improved stability is obtained by heat treatment of a filament under specified conditions after a stretching process, addressing shortcomings of fibers prepared only with the earlier ternary copolymer approach.

Sep 21, 2026

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