JP3355082B2 - Opaque yarn with gloss - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn suitable for use in clothing, especially for women's innerwear, foundation, swimwear, etc., and more particularly to a yarn which is not transparent by water or sweat.

[0002]

2. Description of the Related Art Conventionally, for women's innerwear, foundations and swimwear, nylon yarns of 20 to 40 d and irregular cross-section yarns of 5 to 15 filaments have been used. , Is being used in the foundation department. This 20d-4
The 0d class nylon polyester filament yarn is manufactured through a conventional melt spinning and draw-twisting process, or by a method using a spin draw that omits a drawing process. In the case of an inner, a tricot (warp knitting) is used. , In the case of a foundation, it is knitted with Russell (pattern edition), and the swimsuit is made into fabric by cross knitting with spandex,
It has been supplied as a final product after dyeing and sewing.

[0003] On the other hand, in recent years, with the pursuit of complete cooling and heating and the pursuit of fashion, the clothing applications are required to be thin and lightweight year by year, and the denier of the yarn is also required. However, although the white color of the swimwear wear is very popular due to its fashionability, it has a problem that the skin is transparent when wet with water. In order to solve such a problem, it was attempted to add a small amount of titanium oxide or increase the number of filaments at the yarn stage.However, silky luster was lost by mixing titanium oxide, and the number of filaments was increased to increase softness. Another drawback is that it becomes too weak and lacks strength. On the other hand, it has also been considered to increase the knitting course during knitting to reduce the stitch spacing, and although some effects were seen, they did not reach the point where the see-through was prevented.

On the other hand, JP-A-5-247723 proposes a composite fiber in which an opaque white polymer layer containing titanium oxide and a transparent polymer layer are joined. Also, Japanese Patent Application Laid-Open No. 62-57920 and Japanese Utility Model Application Laid-Open No.
No. 83 is a polyester core-sheath composite fiber,
There is disclosed a material containing a matting agent in a core portion and no matting agent in a sheath portion.

[0005]

However, Japanese Patent Laid-Open Publication No.
No. 47723 discloses that a polymer containing titanium oxide is exposed on the surface, so that reed abrasion or the like occurs, the content of titanium oxide cannot be increased, and a component containing titanium oxide is exposed on the surface. There is a disadvantage that the gloss is lost.

Further, those disclosed in Japanese Patent Application Laid-Open No. 62-57920 and Japanese Utility Model Application Laid-Open No. Hei 4-21583 cannot obtain a sufficient light-shielding property. This is because, in the case of polyester, titanium oxide is apt to aggregate, so that it is necessary to use titanium oxide having a small particle size, and such a titanium oxide cannot provide a sufficient light-shielding property. The present invention solves such a problem, and an object of the present invention is to provide a conjugate fiber having high light-shielding properties and silky luster.

[0007]

According to the present invention, there is provided a core-sheath type conjugate fiber comprising a plurality of polymers and having a core area ratio of 50% or more in a cross section, wherein the sheath component has a titanium oxide content.
The core component is a polyamide containing less than 0.001% , the core component is a polyamide containing 10 to 20% by weight of titanium oxide having a particle size of 0.2 μm or more, and has an irregular cross-sectional shape. It is an opaque yarn having gloss, characterized by having a relatively low viscosity.

The opaque yarn of the present invention is a core-sheath type conjugate fiber in which a plurality of polymers are bonded, and the area ratio of the core component in the cross section of the conjugate fiber must be 50% or more. When the ratio of the core component is less than 50%, sufficient light-shielding performance cannot be obtained. On the other hand, when the ratio of the core component is 80% or more, there is a problem in operability and it is usually difficult.

In the present invention, the core component is titanium oxide.
It contains 0 to 20% by weight. The content of titanium oxide is
Although it is related to the ratio of the core component, if the titanium oxide content in the core component is not set to 10% by weight or more, even if the bonding ratio of the core component is increased to make the content of the entire composite fiber the same, it is sufficient. It is not possible to obtain a great light-shielding effect.

It is generally difficult to increase the content of titanium oxide beyond 20% by weight because of the risk of secondary agglomeration in lactams and the like, and there is a risk that the permeation pressure will increase significantly during spinning. is there. Furthermore, the particle size of titanium oxide needs to be 0.2 μm or more. In general, fine particles are less likely to cause agglomeration and the like, and are preferable as an additive. However, in the case of the present invention, fine particles exceeding this range cannot provide sufficient light-shielding performance. However, it will generally be difficult to use particles having a particle size of 2.5 μm or more in relation to the spinning technique. In addition, the titanium oxide is preferably a non-coating trace type hardly causing secondary aggregation, and the particle size distribution is also 0.3 to 0.5 μm.
It is preferable to contain 50% or more of particles having a particle size of m.

In the present invention, the polymer forming the core component is polyamide such as 6 nylon, 66 nylon, 12 nylon and 6, 66 copolymer nylon. This is because, in the present invention, because of the use of titanium oxide having a relatively large particle diameter as described above, polyester or the like containing a diol component such as ethylene glycol easily causes aggregation and increases the content of titanium oxide beyond the above range. This is because it is difficult.

In the composite fiber of the present invention, it is necessary that the core component has an irregular cross-sectional shape, not a simple round cross-sectional shape. This is to increase the surface area of the core component containing titanium oxide to make the light-shielding effect remarkable, and in this sense, a flat, polygonal, or a combination of a plurality of shapes that can increase the surface area, etc. Can be mentioned as the irregular cross-sectional shape according to the present invention.

In order to stably spin such an irregular shape, the viscosity of the core component polymer must be lower than the viscosity of the sheath component polymer. The viscosity difference is 0.1 c in solution viscosity (solution viscosity of 95% concentrated sulfuric acid).
It is preferably at least ps. For example, in the case where 2.75 to 3.00 6 nylon is used as the sheath component, the solution viscosity of the core component is preferably 2.65 to 2.80.

As described above, the core component contains titanium oxide, whereas the sheath component of the present invention contains substantially no titanium oxide. That is, even a polymer generally called "bright" which does not contain titanium oxide usually contains a small amount of about 0.01 to 0.001% of titanium oxide. In the present invention, such a small amount of titanium oxide is used. Even if such is contained in the sheath component, the gloss is significantly impaired. Therefore,
In the sheath component of the present invention, it is necessary to use a pure bright polymer whose content is lower than this content.

On the other hand, the sheath component preferably contains 1-2% by weight of a fluorescent whitening agent. Examples of such a fluorescent whitening agent include oxazole-based and stilbenzene-based agents, and the use of stilbenzene-based agents is particularly preferred because of having heat resistance. By adding a fluorescent whitening agent to the sheath component, light reflection of the core component can be suppressed and whiteness can be increased.

Next, the spinning and drawing conditions of the above-described core-sheath type conjugate fiber will be described. The method of spinning the conjugate fiber is not particularly limited, as long as it can spin polyamide.
Various methods such as a melt spinning method can be used, and spinning may be performed by using a general composite spinning method. The spinning speed is not particularly limited as long as it is within the range of the composite spinning, but usually 800 to 1200 m in the case of conventional conventional spinning.
/ Degree is preferred.

After spinning, stretching may be performed by a so-called direct spinning stretching method in which stretching is performed once without being wound up.
Stretching may be performed using an ordinary drawing machine. The draw ratio depends on the spinning conditions, but usually about 3.0 to 3.5 times is appropriate. It goes without saying that known processing methods, for example, false twisting, taslan, fluid entanglement blending, twisting and the like may be applied.

[0018]

【Example】

(Examples 1 to 5) Using 6 nylon having a viscosity of 2.90 for the sheath-side polymer and 6 nylon having a viscosity of 2.75 for the core-side polymer, the spinning speed was 1 under the conditions shown in Table 1. 00
The unstretched yarn composite-spun at 0 m / min was stretched 3.1 times using a draw-twisting machine, and the wound filament was evaluated for permeability and the like. The titanium oxide has a particle size of 0.2 to 2.5 μm and a particle size distribution of 0.3 to 0.5 μm.
% Or more was used. Table 1 shows the results obtained by changing the content of titanium oxide and the area ratio of the core. In addition, the whiteness was measured by measuring the L value of the original yarn tightly wound around a white plate, and the transmittance was measured by winding the original yarn on a color plate.

[0019]

[Table 1]

(Examples 6 to 8) In Example 1, the results were obtained by adding 1 to 5% by weight of a benzoxazolyl having a melting point of 365 to 368 ° C. as a stilbene-based fluorescent whitening agent to the sheath-side polymer. Are shown in Table 2.

[0021]

[Table 2]

(Comparative Examples 1 to 6) Table 3 shows the results in Example 1 in which the cross-sectional shape of the core was a round cross-section.

[0023]

[Table 3]

(Comparative Examples 7 to 10) Table 4 shows the results of Example 1 except that the content of the titanium oxide in the core-side polymer was changed.

[0025]

[Table 4]

[0026]

The conjugate fiber according to the present invention is silky and has a high light-shielding property in any environment without deteriorating the excellent glossiness, and is used as a material for women's innerwear, foundation and water-wear. It is suitable.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-134740 (JP, A) JP-A-8-60485 (JP, A) JP-A-5-247723 (JP, A) JP-A 55-134 158331 (JP, A) JP 46-844 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) D01F 8/00-8/18 D01D 5/34

Claims (1)

(57) [Claims] A core-sheath conjugate fiber comprising a plurality of polymers and having an area ratio of a core in a cross section of 50% or more,
The sheath component is poly with titanium oxide content below 0.001%
An amide, wherein the core component is made of a polyamide containing 10 to 20% by weight of titanium oxide having a particle size of 0.2 μm or more and has an irregular cross-sectional shape, and the core component polymer has a lower viscosity than the sheath component polymer An opaque yarn having a luster characterized by: