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Acrylic shrinkable fiber and method for production thereof

a shrinkable fiber and acrylic fiber technology, applied in the field of dyeable highly shrinkable acrylic fiber, can solve the problems of difficult suppression of dyeing shrinkage percentage, insufficient dyeing, and high affecting the shrinkage behavior of the fiber, so as to reduce dyeing shrinkage percentage, and reduce dyeing shrinkage. the effect of the percentag

Inactive Publication Date: 2007-05-03
KANEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] As a result of extensive studies, the present inventors have found that a dyeable acrylic shrinkable fiber that only slightly shrinks when dyed and has a high shrinkage percentage after dyeing can be provided by spinning an incompatible spinning solution.
[0023] The polymers (A) and (B) of the present invention are dissolved in an organic solvent, for example, acetone, acetonitrile, dimethylformamide, dimethylacetamide or dimethyl sulfoxide, or in an inorganic solvent, for example, zinc chloride, nitric acid or rhodan salt to prepare a spinning solution. Inorganic and / or organic pigment such as titanium oxide or coloring pigment, stabilizer effective for anti-corrosion, coloring spinning or weather resistance, or the like can be used for the spinning solution, insofar as spinning can be carried out without problems.
[0026] The acrylic shrinkage fiber of the present invention is made of a spinning solution in which the polymers (A) and (B) are incompatible with each other. Thus, the fiber is assumed to have a sea-island structure in which the polymer (B) present in a lower proportion in the polymer (A) present in a higher proportion forms like islands in the sea. Therefore, since the polymer (B) is not continuously present in the fiber, the fiber has low heat resistance but its shrinkage behavior is not remarkably affected by the polymer (B). Accordingly, a fiber made of an incompatible spinning solution can have a low dyeing shrinkage percentage as compared with a fiber made of a compatible spinning solution. Since the shrinkage percentage of the shrinkable fiber is determined according to the resin composition and the spinning method, when the fiber considerably shrinks in the dyeing process, the shrinkage percentage in the subsequent pile processing process is small. Therefore, the shrinkage percentage after dyeing can be increased by decreasing the dyeing shrinkage percentage.
[0027] Further, in the present invention, when the polymer (A) contains vinyl chloride, compatibility between the polymer (A) and the polymer (B) can be decreased.

Problems solved by technology

Further, the shrinkable fiber can be prevented from shrinking when dyed at less than 70° C. and shrink by heat of the tentering process, but cannot be sufficiently dyed.
For this reason, the polymer (II) highly affects the shrinkage behavior of the fiber, and it is difficult to suppress the dyeing shrinkage percentage even at a low dyeing temperature.
When the fiber shrinks during dyeing, the fiber packing density in a dyeing machine is made small to generate a by-pass which causes dyeing nonuniformity.
Further, the fiber has drawbacks in that, for example, it is difficult to stretch crimps generated during shrinkage in the polishing process in pile processing.
Thus a pile fabric having desired appearance and texture cannot be provided.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

production example 1

[0043] A pressure polymerization reactor having an internal volume of 20 L was charged with 200 parts of ion exchange water, 0.9 part of sodium lauryl sulfate, 0.43 part of sulfurous acid, 0.22 part of sodium hydrogensulfite, 0.001 part of iron sulfate, 4.9 parts of acrylonitrile (hereinafter referred to as AN) and 52.5 parts of vinyl chloride (hereinafter referred to as VC), and the internal atmosphere was replaced with nitrogen. The polymerization reactor was adjusted to an internal temperature of 50° C., and charged with 0.035 part of ammonium persulfate as an initiator to initiate polymerization. Polymerization was carried out for a polymerization time of 5 hours and 10 minutes while adding 42.1 parts of AN, 0.5 part of sodium styrenesulfonate (hereinafter referred to as 3S) and 0.23 part of ammonium persulfate.

[0044] Then, the unreacted VC was recovered, and the latex was removed from the polymerization reactor, salted out, treated with heat, filtered, washed with water, dehyd...

production example 2

[0047] The drawn yarn obtained in Production Example 1 was relaxed at 5% at 110° C. Further, a high pile was prepared from the relaxed fiber in the same manner as in Production Example 1.

production example 3

[0048] A pressure polymerization reactor having an internal volume of 20 L was charged with 200 parts of ion exchange water, 1.1 parts of sodium lauryl sulfate, 0.13 part of sulfurous acid, 0.17 part of sodium hydrogensulfate, 0.002 part of iron sulfate, 10.7 parts of acrylonitrile and 4.4 parts of vinylidene chloride, and the internal atmosphere was replaced with nitrogen. The polymerization reactor was adjusted to an internal temperature of 55° C., and charged with 0.012 part of ammonium persulfate as an initiator to initiate polymerization. Polymerization was carried out for a polymerization time of 6 hours and 10 minutes while adding 42.7 parts of acrylonitrile, 41.0 parts of vinylidene chloride, 1.2 parts of sodium styrenesulfonate and 0.135 part of ammonium persulfate. Then, the latex was removed from the polymerization reactor, salted out, treated with heat, filtered, washed with water, dehydrated, and dried to obtain a polymer 3. The polymer 3 was dissolved in acetone to pre...

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Abstract

An object of the present invention is to provide a dyeable acrylic shrinkable fiber that only slightly shrinks when dyed and has a high shrinkage percentage even after dyeing. By spinning an incompatible spinning solution, the above object can be achieved, and a dyeable acrylic shrinkable fiber that only slightly shrinks when dyed and has a high shrinkage percentage even after dyeing can be provided.

Description

TECHNICAL FIELD [0001] The present invention relates to a dyeable highly shrinkable acrylic fiber having a high shrinkage percentage even after dyeing, and to a process for producing the same. BACKGROUND ART [0002] Conventionally, acrylic fibers have texture like animal hair, and are used in artificial fur goods such as toys and clothes due to their characteristics. In particular, artificial fur products have a down hair part composed of a shrinkable fiber and a guard hair part composed of a non-shrinkable fiber in appearance in many cases, so as to provide the artificial fur products with fur texture and natural appearance. Since pile fabrics are required to have appearance characteristics, shrinkable fibers are also required to have various hues. However, only shrinkable fibers with limited kinds of hues which are colored in the spinning process have been provided as shrinkable fibers. [0003] The acrylic shrinkable fiber of the present invention after the dyeing process is treated...

Claims

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Application Information

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IPC IPC(8): D02G3/00D01F6/48D01F6/54
CPCD01F6/48D01F6/54Y10T428/2904Y10T428/2913Y10T428/2929D10B2401/14D10B2321/10
Inventor NISHIDA, SOHEIKAWAMURA, KOHEIKURODA, MINORUMIHOICHI, MASAHIKO
Owner KANEKA CORP
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