JPH08134740A - Opaque nylon web - Google Patents

Abstract

PURPOSE: To obtain an opaque nylon web good in opaqueness, abrasion resistance, whiteness and light resistance from sheath-core type nylon conjugate fibers wherein titanium dioxide is contained in the cores in a relatively large amount and wherein a benzoxazole fluorescent brighter and a small amount of titanium dioxide are contained in the sheaths. CONSTITUTION: The opaque nylon web is obtained from sheath-core type nylon conjugate fibers wherein 6-20wt.% of titanium dioxide is contained in the cores and 0.005-0.2wt.% of a benzoxazole fluorescent brighter and <=0.5wt.% of titanium dioxide are also contained in the sheaths, and wherein the cores and the sheaths are substantially concentrically disposed. The volume ratio of the core is preferably 60-90%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nylon cloth having excellent opacity, abrasion resistance, and good whiteness and having excellent light resistance.

[0002]

2. Description of the Related Art Synthetic fibers such as nylon and polyester are inherently transparent in polymers, so that a cloth for clothing using fibers composed only of the polymer has a drawback that the one worn underneath can be seen through. Have In order to prevent this see-through, generally inorganic white fine particles such as titanium oxide are added to the polymer to form fibers. However, when a large amount of white fine particles are added to obtain opacity, the amount of fine particles present on the yarn surface increases, and the yarn guides, rollers, reeds, and reeds in the false twisting process, twisting process, and weaving process of the yarn. There is a problem of causing wear of knitting needles and the like.

As a countermeasure, a method has been proposed in which a large amount of titanium oxide is added to the core portion and a small amount of titanium oxide is added to the sheath portion of a core-sheath type composite yarn (Japanese Patent Publication No. 63-17926). However, with this method, abrasion resistance is good, but good whiteness cannot be obtained, and when dyeing processing (fluorescent whitening processing, etc.) to obtain good whiteness is performed, nylon In this case, there was a problem in light resistance.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and has excellent opacity, wear resistance, and
The purpose of the present invention is to obtain a nylon cloth having good whiteness and excellent light resistance.

[0005]

SUMMARY OF THE INVENTION The present invention achieves the above object and has the following configuration. That is, the present invention provides that "the core contains 6 to 20% by weight of titanium oxide, the sheath contains 0.5% by weight or less of titanium oxide, and the core and the sheath are arranged substantially concentrically. Opaque nylon comprising a core-sheath type nylon composite fiber, which is composed of a yarn containing 0.005-0.2% by weight of a benzoxazole-based optical brightening agent in the sheath portion. "Cloth" is the main point. Hereinafter, the present invention will be described in detail.

The fiber used in the present invention is a core-sheath type nylon composite fiber in which the core portion and the sheath portion of the cross section of the fiber are concentrically arranged. The two kinds of polymer composition of the core part and the sheath part are composed of the two kinds of opaque polymer layers, one core part is an opaque polymer with increased opacity, and the other part is an opaque white polymer. It

First, the titanium oxide used in the present invention may be a conventionally known one. In addition, the nylon cloth of the present invention is also known as nylon 6, nylon 66, which has been conventionally known.
Polyamides such as can be used. The amount of titanium oxide to be added to the core in the present invention needs to be 6 to 20% by weight in order to obtain opacity. When the content of titanium oxide is less than 6% by weight, the effect of opacity is insufficient and unsuitable, and when it is 20% by weight or more, the opacity is good, but yarn breakage occurs during spinning. It is unsuitable because it makes the yarn formability difficult. Preferably 8 to
It is preferably set to 15% by weight. To improve whiteness and opacity, a substance such as a light-proofing agent, a fluorescent whitening agent, and a dye may be added to the core, if necessary. It is necessary that the content of titanium oxide in the sheath is 0.5% by weight or less. Compounding amount
If it is more than 0.5% by weight, wear resistance will be problematic, so care must be taken.

Further, a benzoxazole-based optical brightening agent is blended in the sheath, and any product may be used as the benzoxazole-based optical brightening agent, but it is commercially available from Eastman Kodak Company. Yeast Bright OB-1 (trade name) is preferably used. The amount of the optical brightener added is required to be in the range of 0.005 to 0.2% by weight, and preferably 0.01 to 0.1% by weight. If the amount of the fluorescent whitening agent added is less than 0.005% by weight, the effect of improving the whiteness of the fiber and the opacity effect are insufficient, and the light resistance may be poor. is there. If the addition amount is more than 0.2% by weight, not only the whiteness improving effect is saturated, but also the fiber tends to yellow, which is not preferable.

In the core-sheath type composite fiber used in the present invention, the core portion and the sheath portion are arranged in a substantially concentric shape, and the volume ratio of the core portion is 6
It is preferably 0 to 90%. If it exceeds 90%, the sheath part may be too thin to obtain the effect of the fluorescent whitening agent, and the effect of abrasion resistance may be reduced, and good whiteness and light resistance may not be obtained. It is not preferable. Further, if it is less than 60%, the opacity effect tends to decrease, which is not preferable. Further, a preferable core volume ratio is 60 to 80%. The composite form requires the core and the sheath to be arranged substantially concentrically. Substantially the concentric maximum value of the thickness of the sheath portion here (L _A) and the minimum value ratio _{(L B) (L A /} L B)
Is less than or equal to 1.5.

A knitted fabric is knitted and woven using the above-mentioned core-sheath composite yarn. When knitting a knit, the knitting structure may be any conventionally known knitting structure. Further, when a woven fabric is woven by using this yarn as either a warp or a weft, or both as a warp and a weft, the woven structure of the woven structure is any conventionally known woven structure. be able to. Since the obtained cloth has a good whiteness, scouring, drying, and heat setting are performed by a conventionally known method, and dyeing is unnecessary. However, you may print.

[0011]

[Function] As in the case of the opaque nylon fabric of the present invention, when the fiber core is made to contain a high concentration of titanium oxide, and the sheath part is made to contain a low concentration of titanium oxide and a small amount of a fluorescent whitening agent having good light resistance. , The lack of whiteness of the sheath due to the low concentration of titanium oxide is supplemented with a fluorescent whitening agent with good light resistance, while the sheath with high wear resistance due to the low concentration of titanium oxide provides high density It has become possible to protect the sheath part containing titanium oxide, which has poor wear resistance, and therefore has a good whiteness,
An opaque nylon cloth having opacity, abrasion resistance and light resistance can be obtained.

[0012]

EXAMPLES Next, the method for producing the fabric of the present invention will be described in more detail with reference to the examples. The measurement and evaluation of the performance of the fabrics in the examples were carried out by the following methods. (1) Opacity Magic ink (felt pen) in a grid pattern on a white mount
Draw a black line with a width of 5 mm with a dry measurement cloth or a wet measurement cloth containing 100% by weight of water and place it on the mount.
In the brightness of 00 lux, the transparency of the black line from the upper part of the measurement cloth was judged relative to the naked eye, and evaluated by the following four grades. ◎: Very good ○: Good △: Slightly bad
×: Bad

(2) Light resistance In accordance with JIS L-0842, measurement was carried out with a carbon arc fade meter, and the evaluation was relatively made with the naked eye in the following four grades. ◎: Very good ○: Good △: Slightly bad
X: Poor (3) Whiteness The sensory test was used to evaluate the following four levels. ◎: Very good ○: Good △: Slightly bad
×: Poor (4) Abrasion resistance A copper plate with a thickness of 0.5 mm was run for 30 minutes at an angle of 90 ° C between the copper plate and the yarn at a thread tension of 0.5 g / d and a running speed of 150 m / min. The depth of wear of the subsequent copper plate was measured with a microscope and evaluated relatively in the following four stages. ◎: Very good ○: Good △: Slightly bad
×: Bad

Example 1 For the core of concentric core-sheath composite fibers, 6% by weight, 8% by weight and 1% of titanium oxide were added to ε-caprolactam, respectively.
3% by weight and 20% by weight were added and the mixture was polymerized by a usual method to obtain an opaque nylon composition having a relative viscosity of sulfuric acid of 2.60. Next, titanium oxide was added to ε-caprolactam for the sheath part 0.4.
Add wt% and polymerize in the usual way, sulfuric acid relative viscosity 2.6
A nylon composition of 0 was obtained.

These nylon compositions were formed into yeast nylon OB-1 (benzoxazole-based optical brightener, manufactured by Eastman Kodak Co., Ltd.) at the time of spinning the sheath nylon composition by using a conventionally known core-sheath composite spinning device. ) 0.1% by weight
After the addition, the core-sheath composite yarn was melt-spun and drawn by an ordinary method to obtain a 70-denier / 24 filament concentric core-sheath composite yarn having a core portion of 75% and a sheath portion of 25%.

Using this composite yarn, a warp density of 103 yarns /
Weaving a plain weave with an inch and a weft density of 81 threads / inch, followed by relaxing and scouring by the usual method, then using a heat setter for 17
The fabric of the present invention was obtained by heat setting under the conditions of 0 ° C. for 30 seconds.

For comparison with the present invention, a fabric for comparison was prepared by the same method as in this example except that the amount of titanium oxide in the core portion of the core-sheath composite yarn was set to 4% by weight in this example. Obtained.

Measuring the performance of the fabrics of the invention and of the comparison,
The results are evaluated and the results are shown together in Table 1.

[0019]

[Table 1]

As is clear from Table 1, the fabric of the present invention is excellent in opacity and also has good whiteness, light resistance and abrasion resistance. Further, when the amount of titanium oxide added to the core is 4% by weight, the opacity is lacking.

Example 2 In Example 1, the amount of titanium oxide in the core was 8% by weight, and the amount of optical brightener was 0.005% by weight and 0.005% by weight, respectively.
A fabric of the present invention was obtained by the same method as in Example 1 except that the content was 01% by weight, 0.1% by weight, and 0.2% by weight.

For comparison with the present invention, the amount of the optical brightening agent in the sheath portion of the composite yarn used in this example was 0.00 respectively.
A comparative fabric was obtained in the same manner as in this example except that the content was 3% by weight (Comparative Example 2) and 0.3% by weight (Comparative Example 3).

Measuring the performance of the invention and of the comparative fabric,
The results are evaluated and the results are shown together in Table 2.

[0024]

[Table 2]

As is clear from Table 2, the fabric of the present invention is excellent in opacity and also has good whiteness, light resistance and abrasion resistance. Further, it can be seen that when the amount of the fluorescent whitening agent added is large, the light resistance is good, but when 0.3 wt% is added (Comparative Example 3), good whiteness cannot be obtained.

[0026]

EFFECTS OF THE INVENTION According to the present invention, by blending titanium oxide in the core and optical brightening agent and titanium oxide in the sheath to form a core-sheath type composite fiber, excellent opacity, abrasion resistance and good It is possible to obtain a nylon fabric having a high degree of whiteness and, moreover, to obtain a fabric excellent in light resistance. The cloth of the present invention having such characteristics is a material suitable for sports clothing such as swimwear and tennis wear and various clothing applications.

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location D01F 8/12 Z // D01F 1/10 6/90 301

Claims (1)

[Claims] 1. A core in which the core contains 6 to 20% by weight of titanium oxide, the sheath contains 0.5% by weight or less of titanium oxide, and the core and the sheath are arranged substantially concentrically. An opaque nylon fabric, which is a sheath-type nylon composite fiber and is composed of a yarn in which 0.005-0.2% by weight of a benzoxazole-based optical brightening agent is contained in the sheath portion.