JP3140264B2 - High whiteness polyester fiber fabric - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester fiber cloth having excellent whiteness, and more particularly to a polyester fiber having a good whiteness and opacity, wherein a metal thin film having a mirror surface is spread on the cloth. It concerns a fabric.

[0002]

2. Description of the Related Art Hitherto, it has been considered to increase the whiteness by mixing inorganic fine particles such as titanium oxide with polyester fiber to improve the diffuse reflection on the fiber surface. In addition to being colored, the opacity of the fibers is poor, so that the resulting fibers have insufficient whiteness.

[0003] Also, Japanese Patent Application Laid-Open No. Hei 1-333380 discloses that
A method of coating or laminating white inorganic fine particles such as titanium oxide on one surface of a polyester fiber cloth to increase the opacity and improve the whiteness of the cloth has been disclosed. There was a problem that the thickness became thick and the feeling hardened.

[0004] On the other hand, a method of laminating a metal such as aluminum on one surface of a fabric to improve heat retention has been conventionally developed. However, in this method, there is no recognition of whiteness, and from the viewpoint of improving heat retention, it is recognized that the thickness of the cloth is preferably larger.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a polyester fiber cloth having improved opacity and whiteness.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and have found that when a metal thin film mirror surface is spread on one surface of a white-colored polyester fiber cloth, the opacity is reduced. And a polyester fiber fabric with significantly improved whiteness were obtained.

Thus, according to the present invention, in a polyester fiber cloth colored white using a fluorescent dye and / or a fluorescent pigment, a metal thin film having a lightness index L * value of 85 or more is provided on one surface of the cloth. The mirror surface is spread by foil transfer toward the fabric surface side, and the whiteness W represented by the following equation, measured on the other surface of the fabric, is 13
A high whiteness polyester fiber cloth characterized by having an opacity D of 0 or more and 90 or more is provided.

W = 100− (R ₆₈₀ −R ₄₄₀ ) D = R _b / R _w × 100 (where R ₆₈₀ and R ₄₄₀ each have a wavelength of ₆₈₀ n)
m, reflectance at 440 nm [%], R _b and R _w
Is the reflectance [%] at a wavelength of 420 nm when the standard blackboard and the standard whiteboard are backed, respectively.)

The polyester used in the present invention comprises an aromatic dicarboxylic acid such as terephthalic acid or naphthalenedicarboxylic acid or a lower alkyl ester thereof as a main acid component, and at least one kind of glycol, preferably ethylene glycol, trimethylene glycol, or the like. It refers to an alkylene glycol selected from tetramethylene glycol as a main glycol component.

A part of the acid component is a difunctional carboxylic acid such as adipic acid or 5-sodium sulfoisophthalic acid or an ester-forming derivative thereof, and a part of the glycol component is a glycol such as polyoxyethylene glycol or a derivative thereof. It may be replaced by an ester-forming derivative.

As the polyester, for example, polyethylene terephthalate, polybutylene terephthalate,
Examples include polyesters such as polyethylene naphthalate and polyhexamethylene naphthalate, copolymers of these polyesters with polyethylene isophthalate, and blends of the above-mentioned various polyesters.

If necessary, the polyester may further contain optional additives such as a flame retardant, a fluorescent whitening agent, a matting agent, a pigment, a colorant or an antistatic agent.

[0013] After the above polyester is converted into a fiber according to a conventional method, it is formed into a fabric by an arbitrary shape such as a woven fabric, a knitted fabric or a nonwoven fabric. Polyester fibers can be of any shape, whether flat yarn, false twisted yarn, spun yarn, or blended with natural fibers such as cotton, regenerated fibers such as rayon, and other synthetic fibers as long as the object of the present invention is not impaired. It may be used for knitting, knitting and knitting.

The polyester fiber fabric of the present invention needs to be colored white with a fluorescent dye and / or a fluorescent pigment.

As the fluorescent dye and / or fluorescent pigment to be used, dyes and / or pigments that absorb invisible ultraviolet light and emit fluorescence on the short wavelength side (400 to 450 nm) of the visible region are used. Fluorescent dyes for polyester fibers can be suitably used.

Examples of such dyes include fluorescent dyes of diaminostilbene type, imidazole type, thiazole type, oxazole type, triazole type, oxadiazole type, coumarin type, phthalimide type and pyrazoline type. Fluorescent dyes are preferred because they are excellent in whiteness and light fastness.

As a coloring method, a usual polyester dyeing method can be applied as it is. Generally, the dye concentration is 0.5 to 3.0% by weight, the dyeing temperature is 60 to 130 ° C., and the dyeing time is 30 to 90 minutes. Is preferred. Dyeing may be performed in a fiber state or a fabric state.

At any stage until the synthesis of the polyester is completed, a fluorescent pigment may be added for coloring.
In that case, it is necessary to select a fluorescent pigment having good heat resistance.

A major feature of the present invention is that all or a part of one surface of a white colored cloth and a mirror surface of a metal thin film are bonded by foil transfer.

That is, it is necessary to increase the opacity of the fabric by spreading the metal thin film, and make the fabric surface side a mirror surface so that most of the light transmitted through the fiber is re-entered into the fiber without irregular reflection. is there.

In metal deposition, the surface of the metal is likely to be uneven due to the unevenness of the fabric, and a mirror surface may not be formed. In addition, since the laminate uses a polyester film or the like for the protective layer, the thickness becomes thick and the feeling becomes hard. Because of the tendency, it is necessary to adhere by foil transfer.

Foil transfer is a method in which a metal foil having a thickness of about 2 μm is adhered to a base material via a binder such as polyurethane. Generally, a binder is applied to the base material and then the metal foil is overlaid. 190 ° C, pressure 0.1-2.0k
Heat treatment is performed for 0.5 to 2 minutes under the condition of g / mm ² .

As the metal foil to be used, any metal foil having a mirror surface with a lightness index L * value of 85 or more can be used arbitrarily, and aluminum and silver are particularly preferable.

When the L * value is less than 85, the whiteness of the obtained polyester fiber cloth is low.

The polyester fiber cloth thus obtained must have an opacity D of 90 or more and a whiteness W of 130 or more. If W is less than 130, a sufficient level of whiteness cannot be obtained.
It is difficult to obtain the above whiteness.

[0026]

The present invention employs the above-described structure and has the following effects. First, the polyester fiber cloth of the present invention has high whiteness because it is colored with a white fluorescent dye and / or fluorescent pigment.

Generally, when fabrics having the same lightness are compared with each other by visual sensation, it is felt that whiteness is higher when the hue is bluish than when it is yellowish. That is, CIE
The best whiteness is obtained when the b * value of the color system is about -9 to -11.

However, the undyed polyester fiber is b
* Value is about +2 and has a yellowish hue.

Therefore, for example, when polyester fibers are colored with a fluorescent dye and / or a fluorescent pigment having a maximum wavelength of reflection at around 440 nm, the reflectance at around 400 to 500 nm increases, and the fibers appear bluish, so that the whiteness is improved. I do.

Further, since a metal thin film having a mirror surface is spread on one surface of the polyester fiber fabric of the present invention, most of the light incident from the other surface of the fabric and transmitted through the fiber is mirror surface. It is reflected and re-enters the fiber.

Accordingly, the opacity of the fiber is improved, and as a result, the whiteness of the fabric is significantly improved.

[0032]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. In addition, each physical property in an Example was measured by the following method.

(1) L * value of metal foil mirror surface Macbeth Color Eye MS-2020 (Instruct
mental Color System Limit
ed), and the lightness index L * of the metal foil mirror surface was measured according to JIS Z 8729.

(2) Whiteness W of Fabric W Macbeth MS-2020 (Instrumental Color System
The reflectance R440 and R680 at wavelengths of 440 nm and 680 nm were measured using a spectrophotometer (Limited) and the whiteness W was determined by the following equation. The higher the value of W, the higher the whiteness. _{W = 100- (R 680 -R 440} )

(3) Opacity D of Cloth According to JIS P 8138, the reflectances R _b and R _w at a wavelength of 420 nm when a standard blackboard and a standard white board are backed are measured, and the opacity D is calculated by the following equation. I asked. D = _Rb / _Rw × 100

[0036]

Example 1 Taffeta fabric having a basis weight of 70 g / m ² was woven using polyester multifilaments of 75 denier / 36 filaments obtained by a conventional method for warp and weft.

Next, the obtained woven fabric was scoured and pre-set, then dyed under the following conditions, washed with water and dried for final setting.

On one side of the obtained colored fabric, a 1 μm thick
An aluminum foil having a mirror surface of m was bonded by heating at 180 ° C. for 1 minute at a pressure of 1.5 kg / mm ² via a urethane binder.

Table 1 shows the L value of the aluminum foil used and the performance of the obtained polyester fiber fabric.

[0040]

Example 2 Example 1 was repeated except that a silver foil having a mirror surface with a thickness of 2 μm was used instead of the aluminum foil. Table 1 shows the performance of the obtained polyester fiber cloth.

[0041]

Comparative Example 1 The same operation as in Example 1 was carried out except that a titanium foil having a mirror surface having a thickness of 2 μm was used instead of the aluminum foil. Table 1 shows the performance of the obtained polyester fiber cloth.

[0042]

Comparative Example 2 Example 1 was carried out in the same manner as in Example 1 except that a chromium foil having a mirror surface having a thickness of 2 μm was used instead of the aluminum foil. Table 1 shows the performance of the obtained polyester fiber cloth.

[0043]

COMPARATIVE EXAMPLE 3 One side of a cloth colored in the same manner as in Example 1 was coated with 1 μm of aluminum under a pressure of 10 ⁻⁴ Torr.
m to a thickness of m.

No mirror surface was formed on the metal thin film spread on the obtained polyester fiber cloth, and sufficient whiteness was not obtained.

[0045]

Comparative Example 4 Table 1 also shows the performance of a polyester fiber cloth which was colored in the same manner as in Example 1 and had no metal thin film spread thereon.

[0046]

[Table 1]

[0047]

The polyester fiber cloth of the present invention has high whiteness and excellent opacity, so that it cannot be seen through even a single cloth, and has a soft feeling, so that it can be It can be suitably used for blouse and the like.

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 A41D 31/00-31/02 D06M 1/00-21/24

Claims (3)

(57) [Claims] 1. A polyester fiber cloth colored white using a fluorescent dye and / or a fluorescent pigment, a mirror surface of a metal thin film having a lightness index L * value of 85 or more is provided on one side of the cloth. Characterized in that the whiteness W represented by the following equation is 130 or more and the opacity D is 90 or more, which is measured on the other surface of the fabric while being spread by foil transfer toward Degree polyester fiber cloth. W = 100− (R ₆₈₀ −R ₄₄₀ ) D = R _b / R _w × 100 (where R ₆₈₀ and R ₄₄₀ each have a wavelength of ₆₈₀ n)
m, reflectance at 440 nm [%], R _b and R _w
Is the reflectance [%] at a wavelength of 420 nm when the standard blackboard and the standard whiteboard are backed, respectively.) 2. The high whiteness polyester fiber fabric according to claim 1, wherein the metal is aluminum. 3. The high whiteness polyester fiber fabric according to claim 1, wherein the metal is silver.