Composite Fiber - Japanese Patent Application Publication Kokai 51-116,220 (1976) - Specification

Sep 21, 2026

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Japanese Patent Application Publication Kokai 51-116,220 (1976) describes an improved crimpable composite fiber using an eccentric core-sheath or side-by-side structure along the full fiber length. The fiber combines poly-E-capramide with a specific block polyether ester copolymer elastic polymer, defined by polyester components PTMT (90–55 wt%) and PTMI (10–45 wt%) and a PTMG glycol component (molecular weight 400–4,000). The polyester-to-polyether weight ratio is 85–30:15–70, targeting high spinning ability, strong thermal stability after wet heat treatment, good recovery, and elimination of peeling and “exhausted crimp.”

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages24

Reading Time1 h 0 min

AccessFree to download

1. Title of Invention

Composite Fiber

2. Claim

3. Detailed Description of the Invention

Hidaka,T.,and othersComposite fiber.10 p. 51-1162201976.Patent(Japanese)No.50-40367(1975).Filed: TRANSLATION NO.4443 T R AN S L AT I 0NPATENT BUREAU OF JAPANOFFICIAL GAZETTE FOR UNEXAMINED PATENTS Japanese Patent Application Publication Kokai: 51-116,220(1976) Publication Date: October 13,1976 Number of Invention: 1 (Not yet requested). (Total of 8 pages) Request for Examination: International ClassIntrabureau No. 720647 D 01 F 8/12 720647 D 01 F 8/14 COMPOSITE FIBER Application Number: 50-40,367(1975) Application Date: April 4,1975 Inventors:T.Hidaka 2 Ohaza Nishinoho Aza SahchojiNishiharu-cho,Nishikasugai-gun,Aichi Prefecture S.Mizutani1-24 Mimi-choNishi-ku,Nagoya City C.Tanaka 7-2 Souri Aza ShimodabuchiChita City,Aichi Prefecture M.Morikawa3-6-2 Kobai-choShowa-ku,Nagoya City M.Tanaka1455 TstsuiMatsumae-cho,Iyo-gun,Ehime Prefecture A.Tsuchimoto2612-1 Ohaza KomakiKomaki City,Aichi Prefecture Applicant: Toray Co.,Ltd. 2-2 Nihonbashi Muro-machiChuo-ku,Tokyo Digitized by the Internet Archivein 2019 https://archive.org/details/compositefiber0Ohida SPECIFICATION # 1. Title of Invention Composite Fiber Claim # 2. In the case of composite fiber of eccentric core-sheath or side-by-sidetype along the whole length of fiber comprising poly--capramide and elasticpolymer,an improved crimpable composite fiber characterized by the elasticpolymer being a block polyether ester copolymer comprising the polyester component of 90-55 wt%of polytetramethylene terephthalate and 10-45 wt%ofpolytetramethylene isophthalate and glycol component of poly(tetramethyleneoxide)glycol of molecular weight in the range of 400-4,000,and the weightratio of the polyester component to the polyether component being in the rangeof 85-30:15-70. # 3. Detailed Description of the Invention This invention pertains to a composite fiber comprising poly--capramideand block copolyester ether type elastic polymer. The composite fiber consisting two components having different contraction,in which the two components are combined eccentrically at the filament's lateralcross section has latent crimpability,and it is known to form spiral crimp bythe heat treatment.Especially,polyamide type composite fibers compared withpolyester type composite fibers have many advantages such as soft touch feeling,easy dyeing to obtain brilliant color,etc. Previously,as a such composite fiber having latent crimpability,thecomposite fiber comprising homopolyamide as one component and copolymericpolyamide as the other component has been proposed.In the case of such composite fiber of homopolyamide and copolymeric polyamide,the copolymer is thecomponent which is involved with the load generated by the crimple formed(called load bearing polymer,below),thus,as a result of repeated stretchingand contraction,plastic deformation of the copolymer occurs,and as a result,the state of completely stretched crimp,that is,so-called "exhausted crimp"isformed. In order to eliminate this phenomenon,N-substituted polyamide,blockpolyesteramide,polyurethane and other elastic polymers have been proposed as aload bearing polymer.In the composite fibers in which N-substituted polyamide,block polyetheramide or block polyesteramide was used as one component,thestrength was reduced significantly after the wet heat treatment was carried out,and the touch feeling was hard and coarse.As a result,their application andprocessing conditions were extremely limited.Furthermore,if the component usedwas polyurethane,it was difficult to carry out spinning since the thermalstability of polyurethane was poor. In order to solve those various problems of the previous technologysimultaneously,the authors of the current invention carried out variousstudies,as a result;they found that a specific polyether ester type polymershowed elasticity,its thermal stability at the time of fusion was excellent,and its physical properties were reduced little

FAQs

What composite fiber structure is described in the invention?

It is an eccentric core-sheath or side-by-side composite fiber along the whole length of the fiber.

What elastic polymer composition characterizes the invention?

The elastic polymer is a block polyether ester copolymer comprising PTMT (90–55 wt%), PTMI (10–45 wt%), and PTMG glycol (molecular weight 400–4,000), with a polyester-to-polyether weight ratio of 85–30:15–70.

What problems of previous technologies does the invention aim to eliminate?

It targets improved spinning ability while preventing peeling of the components and thermal deterioration, and it avoids “exhausted crimp” after repeated elongation-contraction.

Sep 21, 2026

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