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Artificial hair fiber, use thereof and process for producing the same

Inactive Publication Date: 2012-03-01
DENKA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0051]The present invention has been able to produce an artificial hair fiber having a good balance between a feel and a curly characteristic. In addition, the present invention has been able to produce a fiber bundle for artificial hair having an excellent weaving efficiency and feel almost without getting caught during hackling.

Problems solved by technology

Unfortunately, the conventional arts as described in the above documents have had room for improvement with regard to the following points.
These fibers have a double structure including a sheath portion and a core portion, which leads to poor uniformity and requires complicated production steps.

Method used

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  • Artificial hair fiber, use thereof and process for producing the same
  • Artificial hair fiber, use thereof and process for producing the same

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

Artificial Hair Fiber

[0055]Qualities of an artificial hair fiber according to the present invention tend to be enhanced when the flexural rigidity measured by the KES method of the artificial hair fiber is moderately large because the artificial hair fiber with such a large flexural rigidity can maintain a gear wave shape and the crimps thereof is not easily undone. In contrast, when the rigidity is moderately small, the feel of the artificial hair fiber tends to be enhanced. Because of the above, the flexural rigidity, as measured by the KES method, of the artificial hair fiber according to this embodiment is preferably between 0.001 and 0.01 gf·cm2, and more preferably between 0.002 and 0.008 g·cm2.

[0056]It has been demonstrated in Examples below that the above artificial hair fiber is excellent in curl uniformity and feel. Because of this the above artificial hair fibers are particularly suitable for an application which is utilized to make the artificial hair fibers curled or fo...

embodiment 2

Process for Producing an Artificial Hair Fiber by Using a Polyamide Resin as a Raw Material

[0081]Another embodiment of the present invention provides a process for producing an artificial hair fiber formed by using a polyamide resin as a raw material, the process comprising: a melt-spinning step of melt-spinning a polyamide resin at a spinneret temperature of 260 to 300° C.; and a stretching step of stretching melt-spun fibers under an atmosphere having a stretching temperature of 90 to 120° C. at a stretching ratio of 200 to 400%.

[0082]This production process can yield an artificial hair fiber having a flexural rigidity of from 0.001 to 0.01 g·cm2 as measured by the KES method.

[0083]In addition, a process for producing an artificial hair fiber formed by using the above polyamide resin as a raw material may include a thermal relaxing step of subjecting the fibers stretched at the above stretching step to thermal relaxing treatment under an atmosphere of air at a temperature of 140 t...

embodiment 3

Process for Producing an Artificial Hair Fiber by Using a Vinyl Chloride Resin as a Raw Material

[0085]Another embodiment of the present invention provides a process for producing an artificial hair fiber formed by using a vinyl chloride resin as a raw material, the process comprising:[0086]a mixing step of mixing a vinyl chloride resin and an additive;[0087]a melt-spinning step of melt-spinning a composition containing the mixed vinyl chloride resin at a spinneret temperature of 160 to 190° C.;[0088]a stretching step of stretching melt-spun fibers under an atmosphere at a stretching temperature of 90 to 120° C., at a stretching ratio of 200 to 400%; and[0089]a thermal relaxing step of subjecting the stretched fibers to thermal relaxing treatment under an atmosphere of air at a temperature of 110 to 140° C. until the entire length of the fibers becomes 60 to 95% of the length before the treatment.

[0090]This production process can yield an artificial hair fiber having a flexural rigid...

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Abstract

The present invention provides an artificial hair fiber having a good balance between a feel and a curly characteristic. The present invention also provides an artificial hair fiber having a better hackling efficiency and weaving efficiency, a fiber bundle for artificial hair, and a process for producing the same. Artificial hair fibers possess desired properties, the fibers having a flexural rigidity of from 0.001 to 0.01 gf·cm2 or being subjected to crimping in which a crimp wave shape satisfies the following formulae: 0.2 mm≦R≦3 mm, 1 mm≦L≦15 mm, (wherein R is a length from the top to the bottom of a crimp wave shape), and (wherein L is a length between the tops (or between the bottoms) of a crimp wave shape).

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a National Phase of PCT International Patent Application No PCT / JP2010 / 055266, filed Mar. 25, 2010, and Japanese Patent Application No 2009-100448 filed Apr. 17, 2009, in the Japanese Patent Office, the disclosures of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to artificial hair fibers used for a hair decoration[0004]2. Description of the Related Art[0005]As an artificial hair fiber, a variety of fibers are commercially available, including a polyvinyl chloride fiber, a polyamide fiber, a polyester fiber, and the like. The fibers are properly used depending on their style or use.[0006]Research has been conducted that allows an artificial hair fiber to approach a texture of natural hair or that imparts superior performance than that of the natural hair to the artificial hair fiber. Examples of evaluation items for the artificia...

Claims

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Application Information

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IPC IPC(8): D02G3/00D01D5/22A41G3/00
CPCA41G3/0083D01F6/10D02G1/14D01F6/60D01F6/40
Inventor HORIHATA, ATSUSHI
Owner DENKA CO LTD
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