JPS61231274A - White cloth excellent in transparency preventing property - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a white fabric with excellent anti-see-through properties.

(rl) Prior Art Conventionally, white fabrics have been used for various types of clothing, but recently there has been a demand for sports clothing that looks even whiter, such as tennis wear and ski wear.

As a white fabric that makes white more intense to the human eye,
Cotton traditionally dyed with fluorescent whitening dyes.

Nylon, polyacrylic or polyester fiber fabrics have been used. However, cotton and nylon fiber fabrics dyed with fluorescent whitening dyes do not have sufficient whiteness, and have the disadvantage that they discolor significantly when exposed to sunlight.

Polyacrylic fiber fabrics can provide better whiteness than cotton and nylon, but discoloration due to exposure to sunlight is large, while polyester fiber fabrics have little discoloration due to sunlight exposure, but it is difficult to obtain sufficient whiteness. Ta.

Furthermore, although there is a demand for non-transparent materials for tennis wear and the like, white fabrics have the disadvantage of being more transparent than other colored fabrics.

Various methods have been proposed to prevent see-through.1 For example, there is a method of making the fiber itself opaque as shown in Japanese Patent Publication No. 46-2797, and Japanese Patent Publication No. 48
There is a method of applying an opaque resin, as shown in No. 45698. However, these methods often reduce white skin and have the disadvantage of impairing texture.

Furthermore, a method has been proposed in which the cross section of the fibers is made into a 7- or C-shape to diffusely reflect the light passing through the fabric and make it opaque (Japanese Patent Laid-Open No. 57-82543).
When the cross section is 7-shaped or C-shaped, the scattering effect is small and the opacity is not sufficiently achieved.

(c) Problems that the invention attempts to solve The present invention was made in view of the above-mentioned current situation.

It has a very good white skin and excellent anti-see-through properties.

Moreover, it is an object of the present invention to provide a white fabric that has less discoloration due to sunlight and less loss of white skin due to washing.

(d) Means for Solving the Problems The present invention is based on the present invention, in which the cross section dyed with a cationic fluorescent whitening dye contains a W-type sulfoisophthalic acid component of 0.8 to 3 m.
A fabric mainly composed of polyester fibers dyeable with cationic dye containing 0.1%, characterized by containing at least 0.1% or more of aromatic polyester polyether copolymer based on the weight of the fabric. The gist is a white fabric with excellent anti-see-through properties.

The present invention will be explained in detail below.

The fabric of the present invention has a sulfoisophthalic acid component of 0.8 to 1
．． 8 mo1% of cationic dye dyeable polyester fibers, which are mainly composed of fibers with a W-shaped cross section.

As the sulfoisophthalic acid component, a metal salt of sulfoisophthalic acid may be used, and for example, 5-sodium sulfoisophthalic acid, its lower alkyl ester, ethylene glycol ester, etc. can be used.

The content of sulfoisophthalic acid component is 0.8 to 1.8 mo
It should be in the range of 1%, and if the content is less than 0.8 mo1%, the dyeability of the cationic dye will be poor.

A good white skin cannot be obtained, and if the amount exceeds 1.8 mo1%, the strength of the fibers will be weakened due to the special cross-sectional shape in the present invention.

Polyester fibers containing sulfoisophthalic acid components can be dyed with cationic dyes, and therefore can be dyed with cationic fluorescent whitening dyes that have good white skin. A fabric with skin can be obtained.

The fibers that mainly constitute the fabric of the present invention are:

Its cross-sectional shape is approximately W as shown in Fig. 1 (a) and (b).
It's in shape. This fiber has an angle θ in FIG.

θ2. It is desirable that e3 is in the range of 20 to 160 degrees; if it is outside this range, it becomes difficult to obtain the see-through prevention effect of the present invention.

If the fabric is mainly composed of fibers with such a cross-sectional shape, the light passing through the fabric will cause a large amount of diffuse reflection on the fiber surface, reducing the amount of light transmitted into the fabric, thereby achieving an anti-see-through effect. You will be able to do this. In addition, the surface of the fabric becomes much brighter, and fabrics dyed with fluorescent whitening dyes appear even whiter.

In order to obtain fibers with a W-shaped cross section, (al and (b)
The polyester polymer containing the above-mentioned sulfoisophthalic acid component may be spun using a spinning nozzle having a shape such as L. When spinning, the spinning speed.

Although it may vary slightly depending on the viscosity of the polymer.

The nozzle in Figure 2(a) yields fibers with the cross-sectional shape of Figure 1(al), and the nozzle in Figure 2(b) yields fibers in the shape of Figure 1(b). can get.

The fabric of the present invention has a sulfoisophthalic acid component of 0.8 to 1
．． A polyester fiber containing 8 mo1%,
Although it is mainly composed of fibers having a W-shaped cross section, it may contain other natural fibers, synthetic fibers, etc. in addition to such fibers.

The term "fabric" used in the present invention refers to a woven fabric, a nonwoven fabric, or the like.

In the fabric of the present invention, the fibers are dyed with a cationic fluorescent whitening dye. Cationic fluorescent whitening dyes exhibit the best whitening among various fluorescent whitening dyes, and when cationic dye-dyeable polyester is dyed with this dye, good color fastness to sunlight can also be obtained.

Specific examples of cationic fluorescent whitening dyes include those represented by first-order chemical formulas (1) to (4).

H, C (where R', R'' are alkyl groups, Although it varies depending on the content and the type of dye, the range of 0.5 to 2% owf is usually desirable.0.
If less than 5% dwf, good white discoloration may not be obtained, and if more than 2% owf is used, the white discoloration will not be improved and, on the contrary, there is a possibility that the fastness to sunlight may decrease.

The dyeing conditions are preferably in the range of 9 hours and 5 to 60 minutes at a temperature of 100 to 140°C. The temperature is below 100℃ or the dyeing time is 5
If it is less than 1 minute, there is a risk of white discoloration and poor quality.

Further, if the temperature is 100° C. or more or the time is 60 minutes or more, the strength may decrease.

The fabric of the present invention has one or more components, and contains at least 0.1% of an aromatic polyester polyether compound based on the weight of the fabric.

Polyester fibers containing aromatic polyester polyether copolymers have increased hydrophilicity, allowing stains to be easily removed by washing, and also reduce re-adsorption of stains during washing.

Specific examples of aromatic polyester polyether compounds include polyesters of terephthalic acid and polyalkylene glycol, polyesters of isophthalic acid and polyalkylene glycol, or copolymers thereof, as well as polyesters and copolymers mentioned above and polyalkylenes. There are block copolymers with glycol, etc.

Methods for incorporating aromatic polyester polyether compounds into fibers include a method of mixing the compound during bipolymerization, and a method of applying an aqueous solution of the compound to fibers in the form of yarn or fabric, followed by drying and heat treatment.

Alternatively, a yarn or fabric is immersed in an aqueous solution of the polymer,
There are methods of processing at high temperatures, and any of these methods may be employed in the present invention.

The amount of the aromatic polyester polyether polymer is required to be at least 0.1% or more based on the weight of the fabric.

If it is less than 0.1%, stain removability becomes poor and good white discoloration cannot be maintained.

(f) Effects The whitening fabric of the present invention has good whitening and anti-see-through properties, as well as good stain resistance and water absorption, but these effects are not due to the following effects. be.

That is, the fibers constituting the fabric of the present invention have a W-shaped cross section, which greatly increases the diffused reflection of light on the fiber surface and improves the anti-see-through property.

White discoloration also improves.

In addition, since polyester fibers dyeable with cationic dyes are used, they are durable and can be dyed with cationic dyes that have good white discoloration, resulting in white discoloration that has not been achieved before.

Furthermore, since the cationic dye-dyeable polyester fiber has a sulfonic acid metal salt, which is a hydrophilic group, in its molecular chain, it has superior stain resistance and water absorbency compared to ordinary polyester fiber. This difference becomes even more pronounced when an aromatic polyester polyether compound, which is a water-absorbing antifouling agent, is added9.
Provides stain resistance and water absorption properties that cannot be obtained with regular polyester fibers.

The fibers having the cross-section of the present invention have large inter-fiber gaps and excellent water-absorbing properties compared to fibers having a normal cross-section.

This property is also increased by adding an aromatic polyester polyether compound.

(f) Examples Next, the method for manufacturing the white fabric of the present invention will be explained using examples. The performance of the fabrics in the examples was measured and evaluated by the following method.

(1) Fluorescence intensity Reflectance at a wavelength of 440 nm was measured and evaluated using a spectrophotometer Color Eye MS-2020 manufactured by Macbeth Co., Ltd. The higher the number, the stronger it is.

(2) Whiteness Tristimulus value
, Y, and Z.

Calculate white skin W using the following formula. numbers The higher the value, the better the white skin.

W=4B-3Y (However, B -0,8472) (3) Transparency Using the above spectrophotometer, determine the reflectance with a black background and a white background, and use CIELab's color difference formula. Calculate △E. The smaller the number, the more effective it is at preventing see-through.

(4) Water absorbency According to JIS L-1096 Baylefuku method.

(5) Antifouling properties 200 ml of detergent solution containing 1 g/l each of sodium tripolyphosphate and sodium laurylbenzenesulfonate
A test solution is prepared by adding 0.2 g of the following weight components of contamination sources.

Next, using a round-o-meter tester, the above test liquid, 10 steel balls, and 4 test pieces (5 cm x 5 cm) were placed in a test bottle and treated at 40°C for 15 minutes.

After drying the resulting contaminated cloth, it turns gray. Evaluate the degree of contamination on a scale.

(6) Light resistance According to JIS L-0842.

Example 1 1.5 mo1% 5-sodium-sulfoisophthalic acid
The copolymerized cationic dye-dyeable polyester polymer was spun from the spinning nozzle shown in FIG. 2 (a) and (bl).

Figure 1 (100 denier/cross-sectional shape of (al, (bl)
A prototype drawn yarn with 48 filaments was made. Using this cationic dye dyeable polyester fiber, the warp density is 100//
Weaving a taffeta fabric with a weft density of 75 threads/inch,
Desizing and scouring are performed in hot water at 98 to 100°C.

It was dried and heat-fixed at 170°C for 1 minute. Next, for staining, use IntexB, a cationic fluorescent whitening stain.
Using AC (manufactured by Ciba Geigy Corporation), 1% o, w,
High-temperature dyeing was carried out at 130°C for 30 minutes at f, and at the same time, water-absorbing antifouling agent 5R-1000 (manufactured by Takamatsu Yushi Co., Ltd., Elumasion of aromatic polyester polyether compound) 4% o, w, f, It was added to perform water absorption and antifouling treatment. This fabric was dried and heat set at 170° C. for 1 minute to smooth out wrinkles and stabilize dimensions.

The performance of the obtained fabric of the present invention was measured and evaluated, and the results are shown in Table 1.

For comparison with the present invention, a 100 denier/48 filament drawn yarn of ordinary polyethylene terephthalate fiber with a round cross section was used and subjected to weaving, desizing and heat setting under the same conditions as in this example, and the resulting fabric was High-temperature staining was performed at 130°C for 30 minutes using Uvitex EBF (Ciba Geigy Co., Ltd.) 1% O, W, F, which is a dispersed fluorescent whitening dye, and at the same time, 4% of the above-mentioned 5R-1000 was applied.
Add o, w, f to perform water absorption and stain resistance treatment.

Drying and heat setting were performed under the same conditions as in this example to obtain a white fabric for comparison. Regarding the obtained white fabric for comparison,
The performance was measured and evaluated, and the results are shown in Table 1.

As is clear from Table 1, the white fabric of the present invention has excellent whitening properties, anti-see-through properties, water absorption properties, and antifouling properties. This white fabric is a material suitable for use in sports clothing and the like.

(g) Effects of the Invention The white fabric of the present invention has a substantially W-shaped cross-sectional shape dyed with a cationic fluorescent whitening dye, and contains no sulfoisophthalic acid component.
．． A fabric mainly composed of cationic dye-dyable polyester fibers containing 8 to 1.8 mo1%, and containing at least 0.1% or more of an aromatic polyester polyether compound based on the weight of the fabric. The white fabric of the present invention has good white discoloration, has an extremely excellent anti-see-through effect, and is rich in hydrophilicity and stain resistance that conventional polyester fibers do not have. . The white fabric of the present invention can be used in the field of sports clothing, etc.

It can be provided as a material suitable for fields where white color is desired.

[Brief explanation of drawings]

FIGS. 1(a) and 1(b) are enlarged views showing the cross-sectional shapes of fibers constituting the fabric of the present invention. Figure 2 (al, (b)) is the same as Figure 1 (al, (b)), respectively.
FIG. 4 is an enlarged view showing the shape of a hole in a spinning nozzle for obtaining a fiber having the cross-sectional shape of FIG. Patent applicant: Uni-Tei Riki Co., Ltd. (d) (a')

Claims (1)

[Claims] (1) 0.8 to 1.8 mol of a sulfoisophthalic acid component with a W-shaped cross section dyed with a cationic fluorescent whitening dye.
A fabric mainly composed of polyester fibers dyeable with cationic dyes, which contains at least 0% aromatic polyester polyether compound based on the weight of the fabric.
．． A white fabric with excellent anti-see-through properties characterized by having a content of 1% or more.