JPH05222606A - Color-anisotropic fiber excellent in durability - Google Patents

Abstract

PURPOSE:To provide the subject fiber composed of a specified conjugated fiber having a metallic film as the reflective first film layer and a tin oxide film, etc., as the transparent second film layer respectively thereon, excellent in adhesion, light resistance, fashionability, abrasion resistance and washing resistance and useful for a fabric, a nonwoven fabric, etc. CONSTITUTION:The objective fiber is composed of a specified conjugated fiber having a metallic film of Al, etc., as the reflective first film layer and a tin oxide film or a tin oxide-tin mixture film as the transparent second film layer respectively thereon. The above-mentioned specified conjugated fiber is a sheath- core type conjugated fiber obtained by mutually bonding two kinds of different components and the sheath component is a polymer having a melting point lower than that of the core component polymer. The cross-section ratio of the core component to the sheath component is >=2/1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a colored anisotropic fiber or fiber structure having excellent durability.

[0002]

Conventionally, aluminum, gold,
A metal film of silver, copper, zinc (hereinafter referred to as Al, Au, Ag, Cu, Zn) or the like is used as a transparent film of aluminum oxide (hereinafter referred to as Al ₂ O ₃ ), antimony oxide, titanium oxide,
Films having metal oxide films such as zirconium oxide have been proposed. Further, after the above-mentioned metal film and metal compound film are formed on the film, these are further laminated, and the uppermost layer is made of a reflective film such as Al and Ag having high reflectance, polyvinyl chloride, polyvinyl acetate, polyacrylic acid. It has been proposed to provide a pressure-sensitive adhesive layer obtained by subjecting a thermosensitive resin such as ester or a natural resin, polyvinyl ether or the like to a base film for adhesion processing. (JP-A-61-169
No. 00).

On the other hand, in Japanese Unexamined Patent Publication No. 3-82881, a reflective metal film, a transparent metal compound film, and a semitransparent metal film are sequentially deposited on at least one surface of a fiber cloth from the side of the fiber cloth,
An example has also been proposed in which the interference effect is exhibited by increasing the thickness of the uppermost semitransparent metal film (200 Å or more).

Further, Japanese Patent Laid-Open No. 60-32645 discloses that
When a metal or metal compound is vapor-deposited on a film with a flat surface to create a film with an interference pattern, use a fine grid-shaped deposition mask to form a film with two or more steps, depending on the viewing angle. Methods have been obtained for imparting no iris color.

Further, Japanese Patent Publication No. 59-23882 discloses that
A titanium nitride thin film is formed on stainless steel by using sputtering, ion plating, plasma CVD, or the like, and silicon nitride (hereinafter referred to as Si nitride) is used to further improve corrosion resistance.
_A bilayer film coated with ₃ N ₄ ) has been proposed. By changing the thickness of the uppermost layer of Si ₃ N ₄ ,
Various color tones can be obtained by the interference effect of light.

Japanese Patent Laid-Open No. 60-2359 discloses a transparent film other than a metal oxide, such as copper iodide, magnesium fluoride, aluminum fluoride (hereinafter CuI, MgF ₂ , Al).
In some cases, a transparent film such as F ₃ ) is used.

For the purpose of improving the adhesion between the polymer and the metal or metal compound deposit, a transparent resin such as dimethyl silicone resin, fluorine-containing acrylic resin, polyether polyester resin, urethane resin, acrylic resin or the like is formed on the base cloth. It is also reported that the mixed resin is coated and the metal and the metal compound are vapor-deposited thereon, or the metal and the metal compound are vapor-deposited and then the protective film is coated on the uppermost layer.

[0008]

However, in the method proposed in Japanese Patent Laid-Open No. 61-16900, the metal film and the metal oxide film have a multilayer structure in order to obtain an excellent color anisotropic effect. It is necessary, and it causes a big problem in terms of work complexity and economical aspect. On the other hand, it is necessary to reduce the number of layers in order to solve the complexity of work and economic problems, and this produces a wonderful color anisotropic effect that can be an excellent fashion material aimed by the present inventors. I can't.

In the method proposed in Japanese Patent Laid-Open No. 3-82881, only a specific color is developed, or the degree of color development greatly changes depending on the viewing direction. or,
Reflective metal film, transparent metal compound film, to obtain interference effect
Not only the semi-transparent metal film has a laminated structure (three layers) and the thickness of the uppermost semi-transparent metal film needs to be increased, but also the work complexity, economical aspect, durability and texture are required. There is a big problem on the surface.

The method proposed in Japanese Patent Laid-Open No. 60-32645 reduces the dependence of light intensity depending on the viewing direction by vapor-depositing only one mask to form a protrusion structure on the film. However, since the film having a flat surface is used, the above-mentioned drawbacks cannot be eliminated yet.

On the other hand, as proposed in Japanese Unexamined Patent Publication No. 60-2359, there are examples in which various transparent films are used, but these processed products do not provide excellent color anisotropy effect. However, the durability is poor and the light resistance is very serious.

The color obtained by the method proposed in Japanese Examined Patent Publication No. 59-23882 is mainly yellowish, and even if the film thickness of Si ₃ N ₄ is changed, there is little variation in color. I can't get the variety of fashionable colors that I have demanded.

In a method of coating a lower layer resin on a base fabric to improve adhesiveness, and then depositing a metal film and then a transparent film on the base fabric, or depositing a metal film and then a transparent film, and then coating a protective film. The durability such as abrasion resistance and washability is certainly improved, and it can be widely applied to the fiber structure, but the use of the filament is sometimes limited. When a protective film is used, the durability is certainly improved, but the originally excellent color anisotropic effect may be deteriorated or discolored.

[0014]

The present inventors have completed the present invention as a result of intensive studies to improve the drawbacks of the prior art. That is, the first invention is a polymer in which two different components are joined in a core-sheath type, and the sheath component (hereinafter referred to as S component) has a lower melting point than the polymer of the core component (hereinafter referred to as C component). And a metal film as a reflective film of the first layer and a transparent film of a second layer on the composite fiber or the fiber structure containing the fiber having a cross-sectional area ratio of C component / S component of 2/1 or more. A fiber or a fiber structure characterized by having a tin oxide (hereinafter referred to as SnO ₂ ) film or a mixed film of SnO ₂ and tin (hereinafter referred to as Sn) film.

The second aspect of the present invention is a polymer in which two different components are joined in a core-sheath type, the S component has a melting point lower than that of the C component polymer, and the C component / S component is separated. Al and Al ₂ O as a first layer reflective film on a composite fiber having an area ratio of 2/1 or more or a fiber structure containing the fiber
₃ mixed film of a possible fiber or fiber structure, characterized in having a mixed film of SnO ₂ or SnO ₂ and Sn as the transparent film of the second layer.

The core-sheath type conjugate fiber referred to in the present invention is a polymer having a circular, elliptical or amorphous center portion, and a circular, elliptical or amorphous polymer having a melting point around it which is lower than that of the polymer in the central portion. A composite fiber composed of a polymer, in which the C component is not present on the surface and only the S component is present on the surface, but a part of the C component is present on the surface as long as the object and effect of the present invention are not impaired. It may be exposed.

The C component of the fiber referred to in the present invention includes all polyamides including nylon 66 obtained by copolymerizing hexamethylenediamine and adipic acid, nylon 6 obtained by ring-opening polymerization of ε-caprolactam, or terephthalic acid. Polyethylene terephthalate (hereinafter referred to as PET) consisting of a dicarboxylic acid or an ester derivative thereof whose main component is and a glycol whose main component is ethylene glycol or an ester-forming derivative thereof, or a dicarboxylic acid whose main component is terephthalic acid or All polyesters including polybutylene terephthalate (hereinafter referred to as PBT) and the like composed of the ester derivative and a glycol containing butylene glycol as a main component or an ester-forming derivative thereof, or an acrylic polymer containing acrylonitrile as a main component , Poly Include known synthetic fibers such as alkenyl alcohols, modified product of polymer with a lower than the polymer melting point as S component around its, copolymer,
Examples thereof include polymers having additives such as softening point lowering agents.

The polymer used as the S component in the present invention has a melting point lower than that of the polymer of the C component, good adhesion and affinity with the C component, and good spinnability. It is not particularly limited. If the polymer does not have a melting point, the Vicat softening point is used instead.

The melting point referred to in the present invention refers to the temperature at which the polymer melts, and the Vicat softening point referred to in the present invention refers to a predetermined load applied to a test piece in a heating bath through a needle indenter placed vertically. The temperature of the heat transfer medium when the needle-shaped indenter has penetrated 1 mm is shown while the temperature of the heat transfer medium is raised at a constant speed while adding.

A polyester copolymer (melting point 265 ° C.) comprising a dicarboxylic acid containing terephthalic acid as a main component or an ester derivative thereof and a glycol containing ethylene glycol as a main component or an ester-forming derivative thereof is used as a C component. In this case, 8 to 20 mol%, preferably 10 to 15 mol% of isophthalic acid is copolymerized in the polyester copolymer, or PBT is preferably used as the S component.

When nylon 66 (melting point 265 ° C.) obtained by copolymerizing hexamethylenediamine and adipic acid is used as C component, nylon 6 (melting point 225 ° C.) obtained by ring-opening polymerization of ε-caprolactam as S component, Alternatively, nylon 610 (melting point 227 ° C.) obtained by copolymerizing hexamethylenediamine and sebacic acid or nylon 12 obtained by polymerization of ω-aminolauric acid with nylon 6 obtained by ring-opening polymerization of ε-caprolactam is nylon 6 / nylon 12 = 0/100 to 100/0, preferably 10/9
0-100 / 0 copolymerized, or nylon 66 and ω copolymerized with hexamethylenediamine and adipic acid
-Nylon 12 obtained by polymerization of aminolauric acid
Nylon 66 / Nylon 12 = 10 / 90-100 /
0, preferably 20/80 to 100/0 copolymerized, or nylon 66 in which hexamethylenediamine and adipic acid are copolymerized and nylon 6 obtained by ring-opening polymerization of ε-caprolactam in nylon 66 / nylon 6 = 10. /
90-100 / 0, preferably 20 / 80-100 / 0
The thing copolymerized is used.

When nylon 6 obtained by ring-opening polymerization of ε-caprolactam having a melting point of 216 ° C. is used as the C component,
Nylon 12 (melting point 179 ° C.) obtained by polymerization of ω-aminolauric acid as S component or nylon 11 (melting point 1) obtained by polymerization of ω-aminoundecanoic acid.
94 ° C.) or nylon 12 obtained by polymerization of ω-aminolauric acid with nylon 6 obtained by ring-opening polymerization of ε-caprolactam is nylon 6 / nylon 12 = 20/8
0/100/0, preferably 30/70 to 100/0 copolymerized or nylon 12 obtained by the polymerization of nylon 66 and ε-aminolauric acid copolymerized with hexamethylenediamine and adipic acid 35 / 65-1
Copolymers of 00/0, preferably 40/60 to 100/0 are used.

When acryl containing acrylonitrile as the main component is used as the C component, methyl acrylate is preferably contained in the acrylonitrile as the S component, preferably 15 to 4 parts.
A polymer or the like copolymerized with 0%, more preferably 20 to 30% is used.

The polymers used for the C and S components are pigments, matting agents, optical brighteners,
Even if an ultraviolet absorber or the like is used according to the purpose, it does not depart from the gist of the present invention.

The cross-sectional area ratio of C component and S component in the composite fiber is such that C component / S component is 2/1 or more, preferably 5/1 to 20.
It is / 1. When the C component / S component is smaller than 2/1, the amount of the S component becomes too large, and the mechanical properties of the fiber or general performance such as dyeing is deteriorated. Also C component /
When the S component is more than 20/1, the amount of the S component is too small, the adhesion between the metal film and the polymer of the S component is not sufficient, and the durability that we aim for is not sufficient. Therefore, the C component / S component is usually 2/1 or more, preferably 5/1 to 2
Set to 0/1.

The relationship between the melting point of the C component polymer (hereinafter referred to as T _mc ) and the melting point of the S component polymer (hereinafter referred to as T _ms ) may be T _mc > T _ms, but preferably T _mc ≧ T _ms
+ 20 ° C., more preferably T _mc ≧ T _ms + 40 ° C., and T
_mc ≧ 130 ° C. If the difference between the values of T _mc and T _ms is smaller than 20 ° C., the melting points of the two become close to each other, so that even the C component polymer may be melted. in this case,
The metal film cracks or the metal film peels off due to the deterioration of the physical properties of the fiber or the contraction of the yarn, and the fiber or the fiber structure having the durability which is the purpose of the present invention cannot be obtained.

The spinning of the present conjugate fiber may be either melt spinning or solution spinning, and the drawing of the conjugate fiber can be carried out by a usual method.

As the metal film used in the present invention, Al, A
Examples include u, Ag, and Cu. Al that is flat and has a large reflectance in the visible region is preferably used. Among Al, the light reflectance at 400 to 600 nm is preferably 30% or more, more preferably 40% or more, particularly preferably 50% or more, and the reflectance difference at the wavelength is preferably 20% or less, further preferably Is 10% or less.

The thickness of the metal film is at least 100 Å or more, preferably 500 Å or more. Particularly preferably, it is 700 to 3000Å. If the metal film thickness is less than 100Å, the reflection of light is insufficient, the interference effect is weakened, and the desired excellent color anisotropic effect cannot be obtained.
The metal film becomes too thin, good adhesion cannot be obtained by heat treatment, and no dramatic improvement in durability such as abrasion resistance and washing resistance can be seen.

Further, at 3000 Å or more, not only saturation of the color anisotropic effect is observed, but also the metal film on the fiber or the fiber structure becomes too thick, the texture is hardened, and the film is liable to peel off and deteriorate in quality. Lead to

When Al is used for the metal film, Al ₂ O ₃ may be mixed as a constituent component of the film. When Al ₂ O ₃ is mixed in Al, the reflectance tends to decrease and the color tone tends to become pale. The amount of Al ₂ O ₃ mixed in Al greatly depends on the degree of vacuum in the system. When the degree of vacuum in the system is low, the amount of residual oxygen is large and Al ₂ O ₃ due to the oxidation of Al.
When the degree of vacuum in the system is high, the amount of residual oxygen decreases and the generation of Al ₂ O ₃ due to the oxidation of Al is suppressed.

Sn is used as a transparent film in the present invention.
O ₂ or a mixture of SnO ₂ and Sn (hereinafter referred to as the transparent film) is used. Surprisingly, when the transparent film is used, a very excellent color anisotropy effect is obtained, and the light resistance, which has been a serious problem with other conventional metal oxides such as titanium oxide and Al ₂ O ₃ , is improved. can do. Further, it is possible to obtain a colored anisotropic fiber or a fibrous structure in which iridescent interference is obtained only by two layers of a metal film and a transparent film, and the brightness of the color does not decrease even if the color changes depending on the viewing angle.

The SnO ₂ / Sn ratio is 1/1 or more, more preferably 5/1 to 3/1. When a mixed film of SnO ₂ and Sn is used, a color anisotropy effect superior to the case of SnO ₂ alone is obtained.

The thickness of the transparent film is usually 100 to 5000.
Å, preferably 200 to 2000Å. If the thickness of the transparent film is less than 100Å, the interference effect is not good,
The desired colored anisotropic fiber or fiber structure cannot be obtained. On the other hand, if it is more than 5000 Å, the film becomes too thick, and the film tends to peel off and fall off, which causes serious problems in terms of durability and texture.

Since the color can be changed depending on the film thickness of the transparent film, the color may be selected according to the purpose. Furthermore, if the film thickness changes by about 50 to 1000 Å depending on the position of the fiber structure, more iridescent and multicolor effects can be obtained.

In the case of fibers, the metal film and the transparent film are usually present only on the surface of the fiber, that is, on the vapor-deposited surface, although it varies depending on the distance between the fibers. In this case, the metal film and the transparent film do not necessarily need to be present in the whole fiber. On the other hand, also in the case of a fiber structure, the metal film and the transparent film do not need to be present on the entire fiber structure, and may be present only on the surface thereof, that is, only on the vapor deposition surface. When vapor deposition is desired on the back side of the fiber or fiber structure, vapor deposition may be performed again from the back side of the first vapor-deposited surface.

In the present invention, in order to improve the adhesiveness between the S component polymer and the metal film, the heat treatment of the deposit is carried out near the melting point of the S component polymer. The term “improving the adhesiveness” as used in the present invention means a method in which a polymer of the S component in a molten state or a softened state and a metal film are sufficiently engaged with each other and then cooled and solidified. By this method, the S component polymer and the metal film are firmly bonded. However, the C component polymer must have a higher melting point than the S component polymer so that the C component polymer does not melt upon heat treatment.

When the method of the present invention is used, the method disclosed in JP-A-3-82 is used.
The durability of the colored anisotropic fiber obtained by the conventional technique such as 881 or JP-B-59-23882 is remarkably improved.

The heat treatment method may be either dry heat treatment or wet heat treatment, and it is not particularly limited as long as the physical properties of the yarn are not deteriorated or the metal film is not peeled off and cracked.

As described above, the durability of the colored anisotropic fiber or the fiber structure obtained by the present invention is remarkably improved as compared with the case where the metal and then the transparent film are vapor-deposited on the ordinary fiber. According to this method, after coating the lower layer resin on the base cloth,
It is not necessary to coat a protective film such as a resin on the uppermost layer after vapor-depositing a metal film and then a transparent film or forming a metal film and then a transparent film on a base cloth, which makes work complicated and economical. Not only is the problem greatly solved, but it can be applied not only to fiber structures such as fabrics, nonwoven fabrics and fiber sheets, but also to filaments, and the durability is markedly improved, so the utility value is extremely large.

As a method of applying the metal film or the transparent film, conventionally known methods such as a vacuum deposition method, an ion plating method, a sputtering method, a PVD method such as a plasma spraying method and a CVD method can be used.

When the surface of the colored anisotropic fiber or the fiber structure obtained by the present invention is measured by an electron microscope, granular particles are obtained here and there. When this was observed by an X-ray microscope analysis, it was found that the particles were aggregates of the transparent film. This granular structure is found in almost all fibers, although the size and number of particles vary. The particle size of the granular structure is 0.2 to 1.0
μ, more preferably 0.3 to 0.8 μ, and the number is usually 100 / μcm ² , and more preferably at most 50 / μcm ² .

The color anisotropy effect referred to in the present invention is considered to be caused basically by a light interference phenomenon. The color tone of an oil film on water or a soap bubble and the spectral phenomenon in a compact disc are its size and color tone. , Fundamentally different in taste. A familiar example is that the luster of pearls is spread over a cloth. Moreover, the color tone can be freely changed depending on the viewing direction and the wavelength of light.

[0044]

The color anisotropic fiber or fiber structure obtained by the present invention is coated with a protective film such as a lower layer resin on the base cloth or a resin on the uppermost layer for the purpose of improving the adhesiveness between the metal film and the polymer. It is an excellent method that can be applied to filaments as well as fiber structures such as fabrics, nonwoven fabrics and fiber sheets, because it offers excellent durability without Are better.

[0045]

[Examples] The color anisotropy effect in Examples is from "excellent", "good", "acceptable", "impossible" in terms of excellent color angle dependence.
It was evaluated. In addition, the light resistance test is performed by using an auto fade meter closed type (FOL-HB) with a UV long-life carbon arc, a back panel temperature of 72 to 74 ° C,
The temperature was 31 ° C., and the ultraviolet irradiation was performed for 20 hours. Color evaluation was carried out by visual judgment and measurement of reflectance. The evaluation method was evaluated as “excellent”, “good”, “acceptable”, and “impossible” in the order of small change in color before and after irradiation with ultraviolet rays. Example 1 PET obtained by a conventional method (intrinsic viscosity [η] = 0.6
A core having 5) as a C component, PET (intrinsic viscosity [η] = 0.60) obtained by copolymerizing 20 mol% of isophthalic acid as a S component, and a cross-sectional area ratio (C component / S component) of 20/1. The sheath-type composite fiber was spun at a temperature of 295 ° C. and with an orifice having a diameter of 0.25 mm.

After cooling, it was wound at a winding speed of 1000 m / min while oiling, and then at a temperature of 84 ° C. for 4 minutes.
It was stretched twice to obtain a core-sheath type composite fiber of 75 de / 24 fil.

An operation of knitting PET of 150 de / 72 fil for 10 rounds and then knitting the fiber (75 de / 24 fil) for one round was repeated to produce a tubular knitted fabric. This side 1
It is cut to 0 cm and placed 15 cm above the vapor deposition source. Using a vacuum vapor deposition device with an electron gun as the vapor deposition source, while keeping the degree of vacuum in the system at 1 × 10 ⁻⁵ Torr, the film thickness of Al is 2000.
Å Then SnO ₂ (tablet pressed powder) with a film thickness of 30
Vapor deposition was performed at a thickness of 0, 600, and 1000Å, and the fibers were heat-treated with a hot air dryer under the conditions of a heating temperature of 200 ° C. and a heating time of 5 minutes. The results are shown in Table 1.

[0048]

[Table 1]

As a result of the photoelectron spectroscopy of the sample obtained in Example 1 (hereinafter referred to as ESCA), Al ₂ O ₃ was contained in Al.
It turns out that there is a mixture. A diagram of ESCA is shown in FIG.

Samples for ESCA measurement were Al film thickness 2000 Å and SnO ₂ film thickness 3 obtained in Example 1.
A fabric of 00Å was used.

Example 2 The transparent film was coated with SnO ₂ (powder pressed tablets) and Sn.
The same procedure as in Example 1 is performed except that a mixture of (granular material) (SnO ₂ / Sn = 4/1) is used. The results are shown in Table 1. Sn
The angle dependence of the color is improved as compared with the case of only O ₂ .

Comparative Example 1 The procedure of Example 1 was repeated except that the transparent film was MgF ₂ .
The results are shown in Table 1.

When this transparent film is used, not only is the color anisotropy effect inferior to the case where the transparent film is used, but also only a sample having extremely poor light resistance can be prepared, and the deterioration of color and darkening become remarkable. ..

Comparative Example 2 PET of 150 de / 72 fil (Intrinsic viscosity [η] =
A fabric made of 0.65) was cut into a piece of 10 cm on each side, which was vapor-deposited and heat-treated in the same manner as in Example 1. The results are shown in Table 2.
Shown in.

In this case, since the metal film and the transparent film have the same type and the same film thickness, the color is the same as that of the first embodiment.

[0056]

[Table 2]

Example 3 The cloth obtained in Example 1 (Al film thickness 2000Å,
SnO ₂ film thickness 1000Å) and the cloth obtained in Comparative Example 2 (Al film thickness 2000Å, SnO ₂ film thickness 1000).
Å) Abrasion test was performed. The abrasion test is performed by coating a metal and then a transparent film, and then heat-treating the fabric to a thickness of 2 mm.
It was performed by moving up and down 10 times with the acrylic resin plate of. In addition, the evaluation method is the one with little deterioration or change in color before and after abrasion, which is "fine", "small",
It was evaluated as "many". The results are also shown in Table 1.

The fabric of the present invention has less deterioration or change in color than the fabric of the comparative example, and has few cracks in the vapor-deposited film and has very excellent durability.

Example 4 The fabric obtained in Example 2 (Al film thickness 2000Å,
A wear test was conducted on a mixture of SnO ₂ and Sn having a film thickness of 1000 Å). The test method and evaluation method are the same as in Example 3. The results are also shown in Table 1.

In this case as well, there is little deterioration or change in color, and there are few cracks in the vapor-deposited film, resulting in very excellent durability.

Comparative Example 3 The procedure of Example 1 was repeated, except that the cross-sectional area ratio of the core-sheath type composite fiber was 1/1 and 30/1. The results are shown in Table 2.

In this case as well, since the metal film and the transparent film have the same film thickness, the color is the same as in the first embodiment.

The fabric obtained in Comparative Example 3 (C / S = 3
Abrasion resistance test was performed on the Al film having a thickness of 0/1 and having an Al film thickness of 2000Å and SnO ₂ film thickness of 1000Å. The test method and evaluation method are the same as in Example 3. The results are also shown in Table 2.

In the case of the core-sheath type composite fiber having C / S = 1/1,
Since the amount of the S component is too large, the mechanical properties of the fiber are remarkably deteriorated and the practical use level is not reached. On the other hand, C / S = 3
In the case of the 0/1 core-sheath type composite fiber, as a result of the abrasion test, the amount of the S component was too small, and the exposure of the C component due to peeling and dropping of the S component became remarkable. The adhesiveness cannot be obtained.

Example 5 Example 5 was repeated except that the degree of vacuum was 5 × 10 ⁻³ Torr. The results are shown in Table 2.

Also in this case, the same color as that of the first embodiment can be obtained. Also, ESCA analysis revealed that Al ₂ O ₃ was mixed in Al. The core-sheath type composite fiber obtained in Example 5 (75 de / 24 fil, Al film thickness 2000)
Å, SnO ₂ film thickness 1000 Å) and the core-sheath composite fiber (75 de / 24 fil, Al film thickness 2 obtained in Example 1)
A fixed amount of each of 000Å and SnO _{2 having} a film thickness of 1000Å) was wound on an aluminum plate, and the reflectance was measured by a Macbeth spectrophotometer. As a result, a similar color, that is, a similar reflectance curve was obtained between both samples, and the maximum reflectance value at the wavelength of the former was smaller than that of the latter.

Example 6 250 core-sheath type composite fibers obtained in Example 1 were arranged at intervals of 10 cm, and vapor deposition and heat treatment were performed in the same manner as in Example 2. The results are shown in Table 3.

[0068]

[Table 3]

The abrasion test was carried out by vapor-depositing a certain amount of fibers wound on an aluminum plate and subjecting to heat treatment to obtain a thickness of 2 mm.
It was performed by moving up and down 10 times in the fiber axis direction with the acrylic resin plate of. The evaluation method is the same as in Example 3. The results are shown in Table 3.

Comparative Example 4 The procedure of Example 6 was repeated except that PET of 150 de / 72 fil was used. The results are shown in Table 3.

Also in this case, the durability of the fiber of the present invention was remarkably improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an etching time and a binding energy by ESCA measurement. The peak at 75.8 eV is Al ₂
It corresponds to O ₃ , and the peak at 72.7 eV corresponds to Al.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location D06Q 1/04

Claims (4)

[Claims] 1. Two different components are joined in a core-sheath type, the sheath component is a polymer having a lower melting point than the polymer of the core component, and the cross-sectional area ratio of the core component / the sheath component is 2/1.
A fiber characterized in that it has a metal film as a reflective film of the first layer and a tin oxide or a mixed film of tin oxide and tin as a transparent film of the second layer on the above composite fiber. 2. Two different components are joined in a core-sheath type, the sheath component is a polymer having a lower melting point than the polymer of the core component, and the cross-sectional area ratio of the core component / the sheath component is 2/1.
A fiber structure characterized in that it has a metal film as a reflective film of the first layer and a tin oxide or a mixed film of tin oxide and tin as a transparent film of the second layer on the fiber structure containing the composite fiber as described above. .. 3. Two different components are joined in a core-sheath type, the sheath component is a polymer having a lower melting point than the polymer of the core component, and the cross-sectional area ratio of the core component / the sheath component is 2/1.
The mixed film of aluminum and aluminum oxide as the first layer reflective film on the composite fiber, and tin oxide or tin oxide and tin mixed film as the second layer transparent film. The listed fibers. 4. Two different components are joined in a core-sheath type, the sheath component is a polymer having a lower melting point than the polymer of the core component, and the cross-sectional area ratio of the core component / the sheath component is 2/1.
A mixed film of aluminum and aluminum oxide as a reflective film of the first layer on the fiber structure containing the composite fiber as described above,
3. The fiber structure according to claim 2, wherein the transparent film of the second layer has tin oxide or a mixed film of tin oxide and tin.