JPH0860485A - White fabric excellent in see-through preventing property - Google Patents

Abstract

PURPOSE: To obtain a white fabric excellent in see-through preventing properties without causing problems in deterioration in color fastness to light. CONSTITUTION: This white fabric contains a specific amount of a delustering agent in a synthetic polymer forming a core component and further a specified amount of a fluorescent brightener in a synthetic polymer forming a sheath component and is constituted of a core-sheath conjugated yarn having a rotation symmetrical shape in the cross section of the core component part. Thereby, the conventionally unexpandable merchandise in the field of clothes due to disadvantages in seeing through the skin during the wearing can be expanded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a white cloth having excellent sheer prevention properties.

[0002]

2. Description of the Related Art Synthetic fibers are superior to natural fibers and regenerated fibers in color developability, dyeing fastness, strength, and versatility of processing, and are used in various clothing fields such as sports, uniforms, women's and men's clothing. .

However, synthetic fibers have the drawback that they are more transparent than natural fibers and regenerated fibers, and that light-colored fabrics are easy to see through. In particular, white cloth has a defect that it is transparent and can be seen through when exposed to water.
In the field of sports clothing such as tennis wear, there has been a demand for a cloth that is white and not transparent.

Conventionally, in order to improve such drawbacks, a method of making a synthetic fiber opaque by mixing a matting agent such as titanium oxide in a synthetic polymer, or a synthetic fiber surface with a high-concentration alkaline solution, etc. A method of roughening the surface to make it opaque, a method of coating the surface of the synthetic fiber with a binder of a matting agent such as titanium oxide, and the like have been proposed. However, the fabrics obtained by these methods are insufficient in hiding power and are not satisfactory in the sheer prevention property.

On the other hand, the white cloth, which has a problem of anti-transparency, has a problem of light resistance and has a drawback that it turns yellow when exposed to sunlight.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to obtain a white cloth which is excellent in anti-transparency and has no problem in light fastness. Is.

[0007]

In order to achieve the above object, the present invention has the following constitution. That is, in the present invention, the synthetic polymer forming the core component contains 1.0 to 5.0% by weight of the matting agent, and the synthetic polymer forming the sheath component contains 0.01 to 1% of the optical brightening agent. A white cloth having excellent anti-see-through property, characterized in that the cloth is made of a core-sheath composite yarn in which the cross-section of the core component portion is rotationally symmetric and contains 0.0% by weight. .

The present invention will be described in detail below. The synthetic polymer referred to in the present invention means a general polymer having a fiber-forming ability that can be synthesized by a polymerization reaction,
Specifically, nylon 6, nylon 66, nylon 12,
Polyamides such as poly-p-phenylene terephthalamide and poly-m-phenylene isophthalamide, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyolefins such as polyethylene and polypropylene, and polyacryls such as polyacrylonitrile. To be Of course, it is not limited to these, other types of polymers can be used, and
Needless to say, each polymer is not limited to a homopolymer and may be a blend, a copolymer or the like.

The core-sheath composite yarn referred to in the present invention is composed of one or more of the above synthetic polymers, and the core component and the sheath component may be the same synthetic polymer or different synthetic polymers. However, in the cross section of the monofilament, it is essential that the cross section of the core component portion be rotationally symmetrical. Here, the rotationally symmetric shape means one that overlaps with the original shape when rotated by a certain angle around the center point of the cross section, and when the core component part is a single component, the center point of the cross section is the axis. When it is rotated by a certain angle, it has a cross-sectional shape that overlaps with the original shape, and even if there are multiple core components in an island shape, it is rotated by a certain angle around the center point of the cross-section of the single filament. It is placed in a position that overlaps with the original shape. When the cross-section of the core component is not rotationally symmetrical, when the synthetic polymer core-sheath composite yarn is spun out from the hole of the spinneret, the spun yarn may differ due to the difference in properties and physical properties between the composite forming components. Presents the phenomenon of so-called thread bending,
A problem may occur in that stable spinning properties and good yarn quality may not be obtained, and the hiding power of the core, which contributes to the sheer prevention property, may be biased and uniform for all angles. The transparency cannot be obtained.

FIG. 1 shows an example of the cross section of the core-sheath composite yarn of the present invention in which the cross section of the core component has a rotationally symmetrical shape, but the present invention is not limited to the cross section of FIG.

In the present invention, the synthetic polymer forming the core component of the core-sheath composite yarn contains 1.0 to 5.0% by weight of a matting agent, and the synthetic polymer forming the sheath component is fluorescent whitened. Agent 0.0
A major feature is that the content is 1 to 1.0% by weight.

The matting agent in the present invention is white inorganic fine particles having a refractive index different from that of the synthetic polymer forming the fiber,
Examples thereof include titanium oxide, zinc oxide, magnesium oxide, aluminum oxide, barium sulfate and silica. The particle size of the matting agent does not affect spinnability, stretchability, etc.
And considering the effect of preventing sheer, the particle size is 0.1 to 2.0.
The range of μm is preferable. The content of the matting agent is 1.0 with respect to the weight of the synthetic polymer forming the core component.
~ 5.0 wt% is required. If the content is less than 1.0% by weight, the effect of preventing see-through is insufficient and 5.0
If it exceeds 5% by weight, spinnability and stretchability are impaired, which is not preferable.

In the present invention, the optical brightening agent means the original wearing optical brightening agent added to the synthetic polymer at the time of fiber production, and it is necessary that it does not hinder the spinnability and drawability. Specific examples include stilbene-based optical brighteners, imidazole-based optical brighteners, imidazolone-based optical brighteners, triazole-based optical brighteners, thiazole-based optical brighteners, and oxazole-based optical brighteners. be able to.

It is essential that the content of the fluorescent whitening agent is in the range of 0.01 to 1.0% by weight based on the weight of the synthetic polymer forming the sheath component, and the content is 0.01% by weight. If it is less than 1.0%, a sufficient whitening effect cannot be obtained, and if it exceeds 1.0% by weight, self-quenching occurs and the whitening effect is greatly reduced, which is not preferable. The cloth composed of the core-sheath composite yarn of the present invention means a woven fabric, a knitted fabric, and a non-woven fabric. The present invention has the above configuration.

[0015]

The white fabric of the present invention has a specific amount of a high concealing matting agent in the core component, and a specific amount of a fluorescent whitening agent excellent in light resistance and heat resistance that can be added to the sheath component during fiber production. Since it is a fabric composed of the contained core-sheath composite yarn, it exhibits a sheer preventive property even when wet with water by a matting agent of inorganic fine particles with high hiding property that is not affected by moisture, and the fluorescent whitening With the agent, a white cloth having excellent light resistance can be obtained as compared with the conventional white cloth obtained by post-dyeing.

[0016]

EXAMPLES Next, the present invention will be described in more detail with reference to Examples. The evaluation of the sheer preventing property and light resistance of the knitted fabrics in Examples was carried out by the following methods. (1) Translucency prevention Water content of 10 in a mangle after dipping in a standard sample and water
The transmittance of visible light having a measurement wavelength of 400 to 800 nm was measured for each sample squeezed to 0% with a Hitachi U-3400 self-recording spectrophotometer. (2) Light resistance According to JIS L-0842 first exposure method.

Example 1 Nylon 6 containing 4.0% by weight of titanium oxide having a particle diameter of 0.25 μm was used as the component A, and a brightening agent 4,4'-bis (benzoxazolyl) -was added to a nylon 6 chip. Add 0.03% by weight of stilbene to make the component B, and use a core-sheath type composite spinning machine consisting of a two-phase extruder to make the component A the core component, the component B the sheath component, and the weight ratio of A: B. 80: 2
Composite spinning as 0, then drawing, 50 denier / 1
A 6-filament core-sheath composite yarn having the cross-sectional shape of (1) in FIG. 1 was obtained.

Next, the obtained core-sheath composite yarn was used for the front side, and 40 denier / 1 filament spandex yarn was used for the back, and a 2-weight ricott of 69 courses / inch, half-structure of 28 wales / inch density. After knitting on the ground, relaxation, scouring and heat treatment were carried out by a conventional method to obtain a white knitted fabric of the present invention having a density of 98 courses / inch and 60 wales / inch.

For comparison with the present invention, a conventional nylon 6 fiber 50 having no core-sheath structure in which 0.5% by weight of titanium oxide is added in place of the core-sheath composite yarn used in the front in Example 1 is used. Knitting was carried out under the same conditions except that denier / 17 filaments were used, and then relaxation, scouring and heat treatment were carried out by the usual methods. Next, under a dyeing condition of a temperature of 100 ° C. and a time of 30 minutes, fluorescent whitening dyeing was carried out according to the following prescription 1, followed by heat treatment, and a white knitted fabric for comparison having the same density as that of the present Example 1 (Comparative Example 1). Got

Formulation 1 UVITEX 2B 1.0% owf (fluorescent brightener manufactured by Ciba-Geigy) Acetic acid 0.2 cc / liter Next, the obtained Example 1 and Comparative Example 1 were measured for anti-transparency and light resistance. The results are shown in Table 1.

[0021]

[Table 1]

As is clear from Table 1, Example 1 is a white cloth having excellent anti-transparency and light resistance, whereas Comparative Example 1 is inferior in both anti-transparency and light resistance.

Example 2 Polyethylene terephthalate polymerized by adding 3.0% by weight of titanium oxide having a particle size of 0.3 μm was used as a C component, and a polyethylene terephthalate chip was provided with a fluorescent whitening agent 4,4′-.
Bis (5-methylbenzoxazolyl) -stilbene was added in an amount of 0.08% by weight to give a component D, and a core-sheath composite spinning machine consisting of a two-phase extruder was used. The sheath component, and the weight ratio of C: D is 60:40
As composite spinning, then drawing, 75 denier / 24
A core-sheath composite yarn having a cross-sectional shape of filament (2) in FIG. 1 was obtained.

Next, the obtained core-sheath composite yarn was used as a warp, and the core-sheath composite yarn was used as two wefts by aligning them, and the warp density was 191 yarns / inch and the weft yarn density was 102 yarns / inch. Weaving into a woven fabric with a density of varassea, followed by relaxation, scouring and heat treatment according to a conventional method,
A white woven fabric of the present invention having a book / inch and a weft of 112 threads / inch was obtained.

For comparison with the present invention, the core-sheath composite yarn used in Example 2 was replaced with 0.5% by weight of titanium oxide.
Other than using the normal polyester fiber 75 denier / 24 filament without added core-sheath structure,
Weaving was carried out under the same conditions, and then relaxing, scouring and heat treatment were carried out by a conventional method. Next, after fluorescent whitening according to the following prescription 2 under the dyeing conditions of temperature 130 ° C. and time 30 minutes,
Heat treatment was carried out to obtain a white fabric for comparison (Comparative Example 2) having the same density as that of Example 2.

Formulation 2 UVITEX EBF 1.0% owf (fluorescent brightening agent manufactured by Ciba-Geigy) Acetic acid 0.2 cc / liter Next, the anti-transparency and the light resistance of the obtained Example 2 and Comparative Example 2 were measured. The results are shown in Table 2.

[0027]

[Table 2]

As is clear from Table 2, Example 2 is a white cloth excellent in anti-see-through property and light resistance, whereas Comparative Example 2 is inferior in both anti-show-through property and light resistance.

[0029]

Since the white cloth of the present invention is excellent in anti-sheer property, it has a drawback that the skin can be seen through while it is worn, and thus the product field cannot be expanded, especially swimwear,
In tennis wear and women's blouses, it is possible to greatly improve the anti-transparency, so it is possible to expand the product.
Since the light resistance is greatly improved compared to the conventional product, the durability of the product is also greatly improved.

[Brief description of drawings]

FIG. 1 (1) to (6) are schematic views showing a cross section of a specific example of the core-sheath composite yarn of the present invention.

[Explanation of symbols]

 1 core component 2 sheath component

Claims (1)

[Claims] 1. A synthetic polymer forming a core component contains 1.0 to 5.0% by weight of a matting agent, and a synthetic polymer forming a sheath component contains 0.01 to 1. A white cloth excellent in show-through preventing property, which is a cloth composed of a core-sheath composite yarn having a cross-section of a core component portion of a rotationally symmetrical shape in an amount of 0% by weight.