JPH08170218A - Heat storage and warmth retaining fiber - Google Patents

Abstract

PURPOSE: To obtain the subject fiber, containing a specific phthalocyanine compound, having warmth retaining properties useful as arctic clothes, sports leisure clothes, interior articles such as curtains or leisure articles such as tents and producible with good productivity. CONSTITUTION: This heat storage and warmth retaining fiber contains a phthalocyanine compound having the absorption peak in a near infrared region at >=650nm. The content of the phthalocyanine compound in the fibrous material may be >=1wt.% and sufficiently 0.01wt.% when the phthalocyanine compound is uniformly present in the fiber direction. A phthalocyanine compound of the formula [Y is (OCH2 CH2 )p W, etc.; W is a 1-4C alkoxy, etc.; (p) is an integer of 1-6; (a) to (d) are each an integer of 0-4; the sum total of (a) to (d) is 1-16; M is a metal, etc.], e.g. octafluoro-octakisanilinooxyvanadium phthalocyanine is preferred from the viewpoint of solubility and light fastness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a selective heat absorbing fiber and a heat insulating fiber which are useful as warm clothes, interior clothes such as sports and leisure clothes or curtains, and leisure goods such as tents. It is a thing.

[0002]

2. Description of the Related Art Heretofore, various kinds of winter clothes, interiors, and leisure goods have been devised and put into practical use for the purpose of keeping heat.

The methods are roughly classified into two types. One of them is to control the structure of the woven or knitted garment and to make the fibers hollow or porous, thereby physically increasing the air layer in the garment to reduce the heat dissipation from the body and keep it warm. Was maintained. The other is to chemically and physically process clothing and fibers to radiate the heat emitted from the body or convert some of the sunlight into heat to actively store the heat. This is a method of improving heat retention.

The first method is to use clothes such as sweaters, which are well known from old days, used in winter. However, conventional leisure items such as skiing, skating, mountaineering and other sports activities, leisure clothing and tents, etc. were not bulky and did not have sufficient heat retention effects. For example, clothing that has often been used for winter sports clothing has padding between the outer and lining to maintain heat retention due to the thickness of the air layer in the padding, but this makes it heavy and bulky and easy to move. There was a problem with sports clothing that required high quality.

In order to solve these problems, in recent years, a method of actively utilizing the heat inside the outside has been started.

As one of the methods, a method of vapor-depositing a metal such as aluminum or titanium on clothing such as a lining and reflecting the radiant heat emitted from the body on the metal vapor-deposited surface to actively prevent the heat from being dissipated. There is. However, these methods not only lead to a considerable increase in the cost of vapor-depositing a metal, but also lead to an increase in the price of the product itself due to a poor yield due to the occurrence of vapor deposition unevenness.

Another method is to knead alumina-based, zirconia-based, magnesia-based ceramic particles into the fiber itself to utilize the far infrared radiation effect and the effect of converting light into heat, which these inorganic particles have. That is, a method of positively taking in external energy is adopted (Japanese Patent Laid-Open No. 63-92720, Japanese Patent Laid-Open No. 1-314715).
JP-A No. 1-132816, JP-A No. 61-
No. 12908, JP-A-3-137214, JP-A-2-61120, JP-A-1-162823, and JP-A-63-126971).

However, there are considerable problems in the method of kneading these inorganic particles to form fibers. For example, when the particle size of the inorganic particles is large, the particles were not extruded smoothly from the spinneret during spinning, or the filter used to increase the spinning production efficiency was clogged, and the fibers could not be uniformly formed into fibers.

Further, mechanical damage such as the spinneret was severe due to the mixing of the inorganic particles. In order to solve only this problem, in Japanese Patent Laid-Open No. 63-92720, fibers have a sheath-core structure and ceramic particles are arranged in the core.
The effect of far infrared radiation has faded away.

As a further problem, it was necessary to add a considerably large amount of particles in order to arrange these inorganic particles inside the fibers to exert their heat storage and heat retaining effects. That is, if the particle diameter is several microns, sufficient effect cannot be exhibited unless the amount of addition is 3% by weight or more, and the difficulty in production efficiency increases. On the other hand, if the particle size of the inorganic particles is further reduced, the cost will increase, and further, the technique required for kneading becomes considerably difficult by making the particles finer. In order to solve these problems, JP-A-63-
Japanese Patent No. 126971 discloses a technique of partially removing the polymer on the fiber surface with an alkali to expose the inorganic fine particle layer on the surface. However, this has led to the loss of its effect due to the high cost of alkali treatment, product variations due to difficulty in controlling dissolution, and most critically, elution of ceramics by alkali.

On the other hand, there is also a method of applying the above-mentioned inorganic fine particles having the heat retention and heat storage effect to the fabric or the fiber by post-processing. For example, the above-mentioned inorganic fine particles are applied or coated on the surface of a cloth together with a resin binder such as polyurethane or polyacrylic acid ester (JP-A-63-35887 and 64-685).
72, JP-A-61-2908). Although these post-processing methods are suitable for the production of a wide variety of products in small lots, the product price increases due to the complexity of the post-processing process, and the flexibility and texture of the resulting cloth, as well as ventilation and transparency Moisture was reduced. In addition, these post-processed products had poor holding properties and durability due to interfacial peeling between the fiber or cloth and the binder due to friction, bending or stretching after long-term use.

Further, in the modification of the fiber with these inorganic fine particles, either by the kneading method or the coating method,
In the system in which a certain amount of addition was secured, the color of these inorganic particles was directly reflected in the textile product. That is, these inorganic particles that impart the heat retaining effect are generally blackish in color, and when this is reflected in the textile product itself, the intended use is in a considerably limited place such as inside clothes. To solve this problem, Japanese Patent Application Laid-Open No. 1-314716 discloses a technique in which fine particles of stannic oxide are doped with antimony oxide to make the particles white. However, this method also causes coloring, and the above-mentioned various problems due to the use of the inorganic fine particles are present, so that they are not fully utilized.

[0013]

Therefore, it has been found that the present invention can solve the above problems and provide a fiber exhibiting the effect of heat storage and heat retention with a small amount. According to this, it is possible to efficiently provide the heat-storing / heat-retaining fiber without lowering the productivity of the fiber as in the case of using the inorganic fine particles.

[0014]

DISCLOSURE OF THE INVENTION The present invention relates to a heat-retaining fiber containing a phthalocyanine compound having an absorption peak in the near-infrared region of 650 nm or more, and a hollow fiber having a further heat-retaining effect. The present invention relates to a heat retaining fiber having a structure.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described in detail below.

In the present invention, the substance which imparts heat storage heat retention to the fiber is a phthalocyanine compound having an absorption peak in the near infrared region of 650 nm or more.

The phthalocyanine compound is 650 n
Any compound may be used as long as it is a compound having an absorption peak in the near-infrared region of m or more, and it is particularly preferable to use a soluble phthalocyanine compound because it needs to be soluble in a fiber or a dispersion medium in a molten state.

Such a soluble phthalocyanine compound is disclosed in JP-A-6-107663 and JP-A-6-255.
48, JP-A-5-345861, JP-A-5
-222301, JP-A-5-222047, JP-A-4-39361, and JP-A-4-2386
No. 8, JP-A-2-175763, JP-A-64
-45474, JP 61-152769, JP 61-152689, JP 61-1.
No. 52685, No. 7-70129, No. 4-273879, No. 60-209583.
JP-A-63-308073, JP-A-5-
No. 25177, No. 5-1272, No. 3-62878, No. 3-31247,
It is disclosed in Japanese Patent Laid-Open No. 63-270765.

In the present invention, among the soluble phthalocyanine compounds, it is preferable to use the phthalocyanine compound represented by the following general formula (I) because of its excellent light resistance.

[0020]

Embedded image

(Where Y is

[0022]

Embedded image

At least one substituent selected from the group consisting of: [wherein R ¹ , R ² , R ³ and R ⁴ each independently represents an alkyl group having 1 to 8 carbon atoms,
X represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms or halogen, and Z is a hydrogen atom, an alkyl group having 1 to 4 carbon atoms,
Alkoxyl groups having 1 to 4 carbon atoms, 1 to 1 carbon atoms
Represents four alkoxycarbonyl or halogen,
W represents an alkoxyl group having 1 to 4 carbon atoms or an acyl group, e, f and j are each independently an integer of 0 to 2, n and m are integers of 1 to 8, and p and q is independently an integer of 1 to 6. ], A to d are integers from 0 to 4 and the sum of a to d is 1 to 16, and M represents a nonmetal, metal, metal oxide, metal carbonyl or metal halide]. Phthalocyanine compound.

More specifically, the phthalocyanine compound represented by formula (I) includes compounds having the following chemical structures.

Octafluoro-octakisanilinooxyvanadium phthalocyanine, octafluoro-octakis (n-butylamino) oxyvanadium phthalocyanine, hexadecafluoro-monoanilinooxyvanadium phthalocyanine, hexadecafluoro-monoanilinocobalt phthalocyanine Hexadecafluoro-monoanilino zinc phthalocyanine, 3,5,6-dodecafluoro-4-tetrakisanilinocobalt phthalocyanine, 3,5,6-dodecafluoro-4- (tetrakisanilino) zinc phthalocyanine, 3,5, 6-dodecafluoro-4-tetrakis (anilino) chloroindium phthalocyanine, 3,5,6-dodecafluoro-4- (tetrakisanilino) oxyvanadium phthalocyanine,
3,5,6-Dodecafluoro-4-tetrakis (anilino) dichlorotin phthalocyanine, 3,5,6-dodecafluoro-4-tetrakis (p-ethoxyanilino) zinc phthalocyanine, 3,5,6-dodecafluoro- 4-tetrakis (p-ethoxyanilino) oxyvanadium phthalocyanine, 4,5-octakisanilino- (3,6
-Octakisphenylthio) oxyvanadium phthalocyanine, 4-tetrakisanilino- (3,5,6-dodecakisphenylthio) zinc phthalocyanine, octakis (anilino) octakis (ethoxy) oxyvanadium phthalocyanine, octakis (anilino) octakis (phenoxy) ) Dichlorotin phthalocyanine, octakis (n-butylthio) octakis (n-butoxy) oxyvanadium phthalocyanine, octakis (n-butylthio) octakis (2-methoxyethoxy) oxyvanadium phthalocyanine, octakis (n-butylthio) octakis (2-hydroxyethoxy) ) Oxyvanadium phthalocyanine, octakis (phenylthio) octakis (ethoxy) zinc phthalocyanine, octakis (o-
Methylphenylthio) octakis (1,2-dimethylpropoxy) lead phthalocyanine, octakis (n-butylthio) octakis (2-aminoethoxy) titanyl phthalocyanine, octakis (2-acetylethylthio) octakis (octyloxy) dichlorotin phthalocyanine, octakis Examples thereof include (benzylthio) octakis (cyclohexyloxy) aluminum chlorophthalocyanine and octakis (n-butylthio) bis (n-butoxy) hexafluorovanadyl phthalocyanine.

The phthalocyanine compound that can be used in the present invention is not limited to the compounds listed here,
Any compound having an absorption peak in the near infrared region of 650 nm or more can be used. The compound coordinated to the phthalocyanine ring is not particularly limited, and a compound coordinated with a metal, a metal oxide, a metal halide, a metal carbonyl or the like can be used. These phthalocyanine compounds can also be used in a salt state. Further, the phthalocyanine compound used in the present invention may be used alone or in a mixture of a plurality thereof.

The phthalocyanine compound used in the present invention is preferably a compound having an absorption peak in the near infrared region of 650 nm or more. The solar radiation spectrum has a peak near 500 nm and contains 95% or more of the total energy between 300 nm and 2000 nm. For this reason,
As a substance that selectively absorbs sunlight, it is most efficient to absorb the light energy within this range and convert it into heat energy. On the other hand, visible light is 380 nm
The range is up to 780 nm, and within this range, humans perceive color as a sensation in the eyes. For this reason, humans perceive color when selectively absorbing or transmitting light in the visible light region, and capture black when light is absorbed for all wavelengths. Also, if the degree of these is strong, the color becomes dark. In this sense, the absorption wavelength is preferably 650 nm or more, and more preferably 750 nm or more.

In the present invention, the material constituting the fibers is not particularly limited as long as it can be generally made into fibers, but for example, nylon 6, nylon 66, nylon 61.
Polyamide fiber such as 0; polyethylene terephthalate,
Polyester fibers such as polybutylene terephthalate;
Polyolefin fibers such as polyethylene and polypropylene, acrylic fibers, polyparaphenylene fibers, vinylon fibers, polyurethane fibers, polyvinyl chloride fibers, acetate fibers, cupra fibers, rayon fibers and the like.
Further, the effect can be imparted to natural fibers such as cotton, wool and silk by a post-processing method.

The state in which the phthalocyanine compound is applied to the fiber material can be a state in which it is included in the fiber material by kneading or the like, or a state in which it is localized on the surface by post-processing such as coating. However, it is preferable that the phthalocyanine compound is present inside the fiber material because of problems such as the sustainability of the effect and the texture of the textile. When it is present inside the fiber, it may be localized and distributed in the cross-sectional direction of the fiber in the fiber such as the sheath-core type that has been subjected to composite spinning.

In the present invention, the addition amount of the phthalocyanine compound to the fiber material may be 1% by weight or less. Considering the stability of the fiberizing process, cost, etc., the addition amount should be small. If the manifestation of the effect is achieved in this sense,
Preferably, the amount added may be 0.1% by weight. Further, considering the manifestation of the effect, if the phthalocyanine compound is uniformly present in the fiber direction, 0.01% by weight of the present invention sufficiently exhibits the heat storage property.

That is, in the case of adding conventional inorganic particles, the inorganic particles were considerably large in view of the diameter of the fiber. For this reason, in the prior art, various factors such as yarn breakage, filter clogging, and difficulty in drawing are included, which reduce productivity. However, in the present invention, since the phthalocyanine compound is considerably compatible with the fiber material, the phthalocyanine compound is uniformly distributed in the fiber material to maximize its effect, so that the addition amount is very small.

In the present invention, the method of kneading the phthalocyanine compound into the fiber may be various methods without particular limitation. For example, in the case of melt-spinning like nylon or polyester, a method of directly mixing in the fiber material and spinning, or a masterbatch prepared by preliminarily containing a high concentration in a part of the raw material is prepared at a predetermined time during spinning. The method of spinning after adjusting to the concentration may be used. Further, in the method of wet spinning such as cupra and acrylic fiber, a method of directly mixing with a spinning dope, a method of previously dissolving a phthalocyanine compound with another solution and then mixing with a spinning dope, or a non-drying operation after spinning. For example, a method of bringing the fibers in a state of contact into the phthalocyanine compound in a uniform volume state or a dispersion state to infiltrate or impregnate the surface or inside of the fibers is used. In any case, the best method may be used depending on the type of fiber material desired, and no special mixing operation is required.

In the present invention, the temperature at which the phthalocyanine compound is kneaded into the fiber material, the kneaded material is spun, and the subsequent post-treatment is not particularly required. That is, the phthalocyanine compound in the present invention has a considerable heat resistance even though it is an organic compound. Conventional organic light-to-heat converting agents are generally unstable with respect to heat and solvents such as acids and alkalis, and even if they are put into fiber materials, their effects are not exhibited. In this sense, it is important that the phthalocyanine compound in the present invention has good heat resistance, and acid / alkali resistance and stability.

For the above-mentioned reason, for example, when melted into fibers such as polyesters and polyamides,
It is possible to spin at 220 ° C. or higher, preferably 250 ° C. or higher. However, 350 ° C. or lower is preferable in consideration of thermal stability. That is, in the present invention, this is the temperature at which polyesters and polyamides are generally spun.
It can be easily produced at around 0 ° C to 300 ° C.

In the present invention, the method of spinning the kneading composition is preferably the same as the kneading operation, depending on the desired fiber material. For example, in the case of wet spinning, the form of wet spinning suitable for each fiber material (extrusion, solvent for desolvent and conditions such as concentration and temperature, etc.) can be adopted, and in the case of melt spinning, ordinary screw can be used. A mold or pressure melt type extrusion spinning device can be used. As described above, according to the present invention, the productivity and quality of spinning can be improved much more than in the conventional case of mixing foreign particles using inorganic fine particles. Also, for these reasons, various types of composite spinning and profiled fibers are possible.

The second requirement in the present invention is a heat-retaining hollow fiber containing a phthalocyanine compound having an absorption peak in the near infrared region of 650 nm or more. The hollow fiber refers to a generally known hollow cross-section yarn, but this requirement is important in terms of heat retention. That is, having a hollow portion inside the fiber means having a large amount of air phase with low thermal conductivity, and is a technique that makes use of old-fashioned wisdom as seen in bulky clothing such as sweaters. That is, by making it hollow and having an air layer, it is more effective to store and retain heat without immediately releasing the stored heat energy. With these meanings, in the hollow portion of the fiber in the present invention, the ratio of the volume occupied by the hollow portion in the fiber to the total volume including the void of the fiber yarn cross section is preferably at least 3%, and preferably Preferably has a hollow portion of 10% or more.

The method of forming the kneaded composition into hollow fibers in the present invention can be easily adopted for the same reason as described above, and the method is not particularly limited. That is, it is desirable to adopt a spinning method suitable for each fiber material. For example, when performing melt spinning,
An ordinary screw type or pressure melt type extrusion spinning device can be used, and as a hollowing method, a method of extruding with air by using a composite spinning port during spinning can be used. After spinning, the third substance may be extracted with a solvent or the like, or the inside of the fiber may be physically peeled to make it hollow.

The heat-retaining fiber or hollow fiber containing the phthalocyanine compound of the present invention is obtained as a single fiber or a long fiber, and is used in the form of a woven fabric, a knitted fabric, a non-woven fabric or the like. The heat-retaining fiber obtained in the present invention is a general-purpose fiber or a fiber having other functions, mixed fiber, mixed fiber,
The combined use by twisting, weaving, and knitting is a more preferable mode for consumers. Needless to say, these can be subjected to extreme processing such as dyeing and resin processing, if necessary, to finish into a desired product.

Since the obtained cloth and the like have excellent heat retention,
Sports clothing, such as windbreakers, wetsuits, swimwear, sweatwear, sweatshirts, tights, leotards, shirts, training wear, underwear, especially winter sports such as ski jackets, ski pants, ski wear, skatewear. Great for clothing. In addition, winter clothes and articles for outdoor sports, such as fishing, mountain climbing,
It is also suitable for hunting. Of course, it is used for daily use such as cold-prevention clothing and supplies, work clothing, cold-prevention goods, hats, gloves, and bedding such as blankets, sheets, mattresses, duvets, cushions, and interior items such as curtains, carpets, trinkets, and knees. In addition, it can be used for various purposes such as tents, sleeping bags, heat insulating materials for agriculture, heat insulating covers, and freeze prevention covers.

[0040]

EXAMPLES The present invention will now be described in more detail by way of examples. These examples illustrate the invention but do not limit it in any way.

In the examples, parts by weight or% by weight are shown unless otherwise specified. The method for evaluating the heat retention and heat storage property in the present invention will be described below.

Temperature was measured by the apparatus shown in FIG. In FIG. 1, 1 is a light source lamp (Hitachi infrared bulb 37
5 W, 100 V), 2 is a measured cloth-like material, 3 is a measuring container (50 mm long × 40 mm wide × 5 mm deep × 1 mm thick transparent polystyrene container), 4 is a temperature sensor (center part inside the container; height) (Placed at a position of 2.5 mm), the distance from the light source to the measurement cloth was 30 cm, and the irradiation time was 20 minutes. The measured temperature was every 1 minute from the start of irradiation, and in some examples or comparative examples, the temperature was recorded 20 minutes after irradiation and 10 minutes after the lamp was turned off.

(Example 1) 10 powders of octafluoro-octakisanilinooxy vanadium phthalocyanine (maximum absorption wavelength: 822 nm / in methyl ethyl ketone) were added to polyethylene terephthalate having an intrinsic viscosity of 0.75.
0 ppm was added, and the mixture was kneaded with a 40φ kneading and pressing machine to obtain chips. This was spun at a spinning block temperature of 295 ° C. in a screw-type melt spinning machine having a round hole nozzle, and stretched to a filament of 70 denier to obtain a filamentous bundle. No problems such as yarn breakage occurred at the spinning stage, and the spinnability was good. A plain woven fabric having 116 warps / inch and weft 78 / inch was obtained from this fiber.

The heat storage / heat retention of the obtained cloth was evaluated by the method described above. The evaluation results are shown in Table 1 and FIG.

(Example 2) A plain weave fabric was obtained and evaluated in the same manner as in Example 1 except that the addition amount of the phthalocyanine compound was 1000 ppm in the same manner as in Example 1. No problems such as yarn breakage occurred at the spinning stage, and the spinnability was good. These results are summarized in Table 1 and FIG.

(Comparative Example 1) A plain weave fabric was obtained in the same manner as in Example 1 except that the phthalocyanine compound was not added, and evaluated. These results are shown in Table 1 and FIG.
Summarized in.

(Example 3) Using the same kneading chips as in Example 1, spinning was carried out at a spinning block temperature of 290 ° C. in a screw type melt spinning machine using a dedicated spinneret for forming hollow fibers.
The filamentous bundle was obtained by stretching so that the hollowness was 30% and the filament was 90 denier 24 filaments. No problems such as yarn breakage occurred at the spinning stage, and the spinnability was good. A plain weave of the fibers of 116 warps / inch and wefts 78 / inch was obtained. The heat storage / heat retention of the obtained cloth was evaluated by the method described above. The evaluation results are shown in Table 1 and FIG. 3 (data of Example 1 is also shown).

(Comparative Example 2) A plain weave fabric was obtained in the same manner as in Example 3, except that the phthalocyanine compound was not added, and the plain woven fabric was evaluated. These results are shown in Table 1 and FIG.
Summarized in.

Example 4 Polypropylene fiber material (Asahi Kasei Polypro, M1700; ~ MFR31g)
/ 10 min: ASTM D1238), and 4,5-octakisanilino- (3,5 as a phthalocyanine compound.
6-Octakisphenylthio) oxyvanadium phthalocyanine (maximum absorption wavelength: 844 nm / in methyl ethyl ketone) was added in the same manner as in Example 1 with an addition amount of 100 ppm.
To obtain a kneaded composition. Then, this was spun at a spinning block temperature of 250 ° C. in a screw type melt spinning machine having a round hole nozzle to obtain about 3 g of nonwoven fabric per 100 cm ² . No problems such as yarn breakage occurred at the spinning stage, and the spinnability was good. The obtained nonwoven fabric was evaluated in the same procedure as in Example 1. These results are summarized in Table 1 and FIG.

(Example 5) A nonwoven fabric was obtained and evaluated in the same manner as in Example 4, except that the addition amount of the phthalocyanine compound was 1000 ppm in the same manner as in Example 4. No problems such as yarn breakage occurred at the spinning stage, and the spinnability was good. These results are summarized in Table 1 and FIG.

(Comparative Example 3) A nonwoven fabric was obtained and evaluated in the same manner as in Example 4, except that the phthalocyanine compound was not added. These results are shown in Table 1 and FIG.
Summarized in.

Example 6 Nylon 66 was used as the polymer, and 4,5-octakisanilino- (3,6-octakisphenylthio) oxynovanadium phthalocyanine (maximum absorption wavelength: 844) was used as the phthalocyanine compound.
nm / in methyl ethyl ketone) was kneaded in the same manner as in Example 1 with an addition amount of 100 ppm to obtain a composition. With a screw type melt spinning machine having a round hole nozzle,
Spinning at a spinning block temperature of 290 ° C, 70 denier 24
A filamentous bundle was obtained by drawing into filaments. No problems such as yarn breakage occurred at the spinning stage, and the spinnability was good. A plain woven fabric having 116 warps / inch and weft 78 / inch was obtained from this fiber.

The heat storage / heat retention properties of the obtained cloth were evaluated by the method described above. The evaluation results are shown in Table 1 and FIG.

(Example 7) A plain weave fabric was obtained and evaluated in the same manner as in Example 6 except that the addition amount of the phthalocyanine compound was 1000 ppm in the same manner as in Example 6. No problems such as yarn breakage occurred at the spinning stage, and the spinnability was good. These results are summarized in Table 1 and FIG.

(Comparative Example 4) A plain weave fabric was obtained in the same manner as in Example 6 except that the phthalocyanine compound was not added, and was evaluated. These results are shown in Table 1 and FIG.
Summarized in.

(Example 8) Using the same kneading chips as in Example 6, spinning was carried out at a spinning block temperature of 290 ° C. in a screw type melt spinning machine using a dedicated spinneret for forming hollow fibers,
The filamentous bundle was obtained by stretching so that the hollowness was 30% and the filament was 90 denier 24 filaments. No problems such as yarn breakage occurred at the spinning stage, and the spinnability was good. A plain weave of the fibers of 116 warps / inch and wefts 78 / inch was obtained. The heat storage / heat retention of the obtained cloth was evaluated by the method described above. The evaluation results are shown in Table 1 and FIG. 6 (data of Example 6 is also displayed).

(Comparative Example 5) A plain weave fabric was obtained in the same manner as in Example 8 except that the phthalocyanine compound was not added, and the plain woven fabric was evaluated. These results are shown in Table 1 and FIG.
Summarized in.

Comparative Example 6 2% by weight of zirconium carbide powder having an average particle diameter of 2.3 μm was added to polyethylene terephthalate having an intrinsic viscosity of 0.75, and the mixture was kneaded with a 40φ kneading and pressing machine to form chips. . Using a screw-type melt spinning machine having a round hole nozzle, the spinning block temperature was 295 ° C.
In order to obtain a filamentous bundle, the filaments were spun into a filament of 70 denier and drawn into 24 filaments. However, since the pressure in the spinning block portion was usually 2 kg / cm ² at the spinning stage, it became 30 kg / cm ² after 30 minutes of spinning, so spinning was stopped. After stopping, the foreign matter removing filter (No. 300 mesh) in the spinning block was examined, and it was found that the filter was clogged with particles like zirconium carbide. In addition, yarn breakage frequently occurred in the drawing process following spinning.

(Comparative Example 7) Copper phthalocyanine dicarboxylic acid (in particular, a maximum absorption wavelength is not shown and it is not dissolved in an organic solvent such as methylketone and measured with a finely divided thin film) is added to polyethylene terephthalate having an intrinsic viscosity of 0.75. 1000p
pm was added, and the mixture was kneaded with a 40φ kneading and pressing machine to obtain chips. This was spun with a screw-type melt spinning machine having a round hole nozzle at a spinning block temperature of 295 ° C., and stretched to a 70 denier 24 filament to obtain a filamentous bundle. The spinnability was slightly poor and yarn breakage occurred, and the pressure in the spinning block was usually 2 kg / cm ² at the end of spinning, but exceeded 5 kg / cm ² after 2 hours. Frequent yarn breakage also occurred in the drawing process following spinning. The obtained filamentous materials were collected to make a non-woven material so that the amount thereof was about 3 g per 100 cm ² , and the heat retention and heat storage property was evaluated by the method described above. The results are shown in Table 1.

[0060]

[Table 1]

[0061]

EFFECTS OF THE INVENTION By using the fiber product of the present invention, sunlight is converted into heat, and the heat is stored / heat-retained, so that it is required to retain heat, such as cold-prevention clothing, sports clothing, leisure clothing or curtains. It is useful as a leisure item such as interior goods and tents. Further, unlike the conventional method, the moldability of the fiber is easy and the productivity is good, and as a result, the fiber product as described above can be provided at a low cost.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an outline of an apparatus for evaluating heat storage / heat retention.

FIG. 2 is a graph showing the heat storage / heat retention effect of the fabrics of Examples 1 and 2 and Comparative Example 1.

FIG. 3 is a graph showing the heat storage / heat retention effect of the fabrics of Example 3 and Comparative Example 2.

FIG. 4 is a graph showing the heat storage / heat retention effect of the fabrics of Examples 4 and 5 and Comparative Example 3.

FIG. 5 is a graph showing the heat storage / heat retention effect of the fabrics of Examples 6 and 7 and Comparative Example 4.

FIG. 6 is a graph showing the heat storage / heat retention effect of the fabrics of Example 8 and Comparative Example 5.

[Explanation of symbols]

 1 ... Light source lamp 2 ... Measured cloth-like material 3 ... Measuring container 4 ... Temperature sensor

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location D01F 6/92 301 L

Claims (2)

[Claims] 1. A heat-retaining fiber containing a phthalocyanine compound having an absorption peak in the near infrared region of 650 nm or more. 2. A heat retaining fiber having a hollow structure which satisfies the requirement of claim 1.