Heat-bondable composite fiber, process for producing the same, and fibrous mass

Inactive Publication Date: 2010-07-29
DAIWABO HLDG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014]30<MIA wherein MIA is a before-spinning melt index (g/10 min) of the polyoxymethylene-based polymer A, which is determined according to JIS K 7210 (conditions: 190° C., load: 21.18N (2.16 kg)), and
[0044]The thermoadhesive conjugate fiber of the present invention is one wherein both of the low-melting-point thermoadhesive component and the high-melting-point component are formed of the polyoxymethylene-based polymers. Therefore, when a sheet article such as a nonwoven is made using this fiber, the fibers are integrated with the polyoxymethylene-based component having the low melting point and another binder component is not required. Such a sheet article presents the heat resistance and the chemical resistance of the polyoxymethylene-based polymer, particularly when it is formed only from the thermoadhesive conjugate fibers of the present invention. Further, the fiber assembly containing the thermoadhesive conjugate fibers of the present invention has a high water retentivity, slippability, crease resistance, and bulk recoverability, and/or good wiping-ability. Therefore, the fiber assembly is suitable for applications which require such properties.
[0045]The thermoadhesive conjugate fiber includes at least two components each of which contains the polyoxymethylene-based polymer. In the present specification, the polyoxymethylene-based polymer is a polymer wherein an oxymethylene unit is a main repeating unit. The polyoxymethylene-based polymer may be a so-called “POM homo-polymer” which is obtained by a polym

Problems solved by technology

Since the polyoxymethylene has excellent crystallizability and present a high crystallization speed and a large crystallinity, it is said that it is difficult to produce a fiber from this resin.

Method used

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  • Heat-bondable composite fiber, process for producing the same, and fibrous mass

Examples

Experimental program
Comparison scheme
Effect test

experimental example 1

Evaluation of Fiber Properties and the Nonwoven-Processability

(Sample 1)

[0163]A polyoxymethylene-based polymer was prepared as the first component (the sheath component), of which TA was 156.0° C., MIA was 51, and content of CH2CH2O as the comonomer was 7.1 mass % as the ethylene oxide equivalent (trade name: V40EX-1 produced by Mitsubishi Engineering-Plastics Corporation). A polyoxymethylene-based polymer was prepared as the second component (the core component), of which TB was 169.0° C., MIB was 28, and content of CH2CH2O as the comonomer was 0.9 mass % as the ethylene oxide equivalent (trade name: A30EX-1 produced by Mitsubishi Engineering-Plastics Corporation). These two components were melted and extruded using a sheath-core composite nozzle (an office diameter 0.6 mm: this was the same in the production of the following samples) at a sheath-component spinning temperature of 190° C. and a core-component spinning temperature of 200° C. The composite ratio (volume ratio) of firs...

experimental example 2

Evaluation of Water Retentivity of Nonwoven

[0218](Sample NW-1)

[0219]The water retentivity of a nonwoven of the fibers of the present invention was evaluated. Sample 12 produced in Experimental Example 1 was used to make a parallel web having a mass per unit area of about 70 g / m2 and then the web was subjected to a hydroentangling treatment. The hydroentangling treatment was conducted using a nozzle wherein orifices each having a 0.1 mm diameter were provided in a line at intervals of 0.6 mm. Water streams were applied once to one surface of the web at a water pressure of 3 MPa and the water streams were applied once to the other surface of the web at a water pressure of 3.5 MPa. Then, the web after the hydroentangling treatment was dried with a hot air-through thermal treating machine at 160° C. to give a thermally bonded nonwoven. The resultant nonwoven was cut into a size of 10 cm×10 cm and put into a water bath. The nonwoven was impregnated with water sufficiently not to float an...

experimental example 3

Evaluation of Slippability of Nonwoven

[0223](Sample NW-3)

[0224]The slippability of the nonwoven formed from the fibers of the present invention was evaluated. Sample 1 produced in Experimental Example 150 mass % and rayon fiber (trade name: Corona produced by DAIWABO RAYON Co., Ltd., fineness 1.7 dtex, fiber length 40 mm) 50 mass % were mixed and a parallel web having about a mass per unit area of about 60 g / m2 was made using the mixed fibers. The web was subjected to the hydroentangling treatment. The hydroentangling treatment was conducted using a nozzle wherein orifices each having a 0.1 mm diameter were provided in a line at intervals of 0.6 mm. Water streams were applied to one surface of the web once at a water pressure of 3 MPa and the water streams were applied to the other surface of the web once at a water pressure of 3.5 MPa. Then, the web after the hydroentangling treatment was dried with a hot air-through thermal treating machine at 160° C. to give a thermally bonded no...

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Abstract

A POM / POM thermoadhesive conjugate fiber is produced by providing two kinds of POM-based polymers A and B which satisfy 30<MIA wherein MIA is a before-spinning melt index (g / 10 min) of the POM-based polymer A (conditions: 190° C., load: 21.18N (2.16 kg)), and TB>TA+10 wherein TA and TB are before-spinning fusion peak temperatures of the POM-based polymers A and B respectively, compositely spinning a first component containing the POM-based polymer A and a second component containing the POM-based polymer B such that the first component is exposed with an exposed length of not less than 20% relative to a peripheral length of the fiber, subjecting the spun fiber to a drawing treatment, and subjecting the drawn fiber to an annealing treatment at a temperature of from 60° C. to 110° C.

Description

TECHNICAL FIELD[0001]The present invention is related to a thermoadhesive conjugate fiber wherein a core component and a sheath component are formed from polyoxymethylene-based polymers and the sheath component has thermoadhesiveness and the production method of the fiber, and a fiber assembly including the fiber.BACKGROUND ART[0002]Polyoxymethylene is called “polyacetal” and known as an engineering plastic which is excellent in electrical insulation, heat resistance and chemical resistance. The molded article of the polyoxymethylene is widely used as, for example, a component of a car. Since the polyoxymethylene has excellent crystallizability and present a high crystallization speed and a large crystallinity, it is said that it is difficult to produce a fiber from this resin. Nevertheless, the production of the fiber from the polyoxymethylene has been tried by i) selecting a particular polyoxymethylene resin, ii) mixing a particular additive with the polyoxymethylene, or iii) comp...

Claims

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Application Information

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IPC IPC(8): D01D5/30D01D5/08D04H13/00D04H1/541
CPCC09J159/02D01D5/12Y10T428/2929D01D10/02D01F8/16D01D5/30Y10T442/637
Inventor USUI, YOSHIJINAGAI, KOJIKAWANAKA, AKIHIKO
Owner DAIWABO HLDG
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