JPH111824A - Luminous fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain luminous fibers for clothes that comprises a luminous fluorescent particle-containing fiber-forming polymer and another fiber-forming polymer having a largely different melting point from the former polymer, are occupied almost part of the fiber surfaces with the latter polymer and have excellent durability and the decay characteristics of the luminescence. SOLUTION: The objective fibers comprises (A) a fiber-forming polymer as polyolefin, polyamide or polyester copolymer that contains luminous fluorescent particles with an average particle size of 0.3-10 μm, preferably having the melting point or softening point of 140-230 deg.C and (B) a fiber-forming polymer as polyester or polyamide having the difference in melting point and softening point from the polymer (A) by 20-100 deg.C, preferably by 20-80 deg.C, particularly by 20-60 deg.C where the polymer B occupies more than 70% of the fiber surface and contains 20-80 wt.% of the polymer B based on the whole fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-storing fiber, and more particularly to a light-storing fiber having durability and a long-lasting afterglow characteristic, and more particularly to a light-storing fiber for clothing.

[0002]

2. Description of the Related Art Hitherto, a fiber having a phosphorescent phosphor coated on a fiber surface is well known. However, since the phosphorescent phosphor coated on the surface of such fibers easily falls off, the washing durability is poor, and the practicability is extremely low in the field where durability is required for clothing use. On the other hand, a luminous fiber in which a luminous phosphor is blended in a polymer constituting the fiber is also well known. However, such fibers also have problems in practicality. That is, the heat resistance of the conventional phosphorescent phosphor compounded in the polymer is low, and when the phosphorescent phosphor is blended in the polymer, its practical use is limited by the melting point of the polymer. For example,
When blended with a polymer having a relatively low melting point, such as polypropylene or polyethylene, there is no problem, but it is inferior in consumption performance including dyeability and heat resistance, and is not suitable for use in clothing. Further, when blended in a polymer having a relatively high melting point, such as polyester generally used for clothing, the phosphorescent phosphor is decomposed by heat during the blending, resulting in a deterioration in the function. The function as a phosphor will not be exhibited.

Further, conventional phosphorescent phosphors are hard and cannot be finely crushed, so that the particle size becomes large. When the amount of imparting the phosphorescent function to the fiber is contained in the polymer, the particles are deposited on the fiber surface in a large amount. When exposed, the fiber surface becomes uneven, resulting in inferior fibrillation processability, such as occurrence of fluff and breakage. Further, problems such as severe guide wear and roller wear occur.

[0004]

As a result of an examination in consideration of the above-mentioned problems, the present invention provides a luminous fiber which does not decompose luminescent phosphor particles due to heat, has good spinning / drawing properties, and has a high luminous function. It became possible to provide.

[0005]

The present invention comprises a fiber-forming polymer (A) containing phosphorescent phosphor particles having an average particle diameter of 0.3 to 10 μm, and a fiber-forming polymer (B). A conjugate fiber, wherein the difference between (i) the melting point or softening point of the fiber-forming polymer (A) and the melting point or softening point of the fiber-forming polymer (B) is 20 to 100 ° C.
(Ii) the fiber-forming polymer (B) occupies 70% or more of the fiber surface; and (iii) the fiber-forming polymer (B) is 20 to 80% by weight of the whole fiber. % Of the phosphorescent fiber.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The basic concept of the present invention is to provide a composite of a structure in which a fiber-forming polymer containing phosphorescent particles having a specific particle size is surrounded as much as possible by another fiber-forming polymer. The conventional disadvantages could be solved by setting the difference between the melting points of the two types of fiber-forming polymers to specific values.

[0007] The phosphorescent phosphor particles used in the present invention are known per se, and emit light by external stimulus, and afterglow is visible to the naked eye for a considerable time after the external stimulus is stopped. For example, CaSrS: Bi (blue light emission), ZnS: Cu (green light emission), ZnCdS: Cu
(Yellow to orange emission) and other sulfide-based phosphors, ZnS: Cu
As described in JP-A-7-11250, a zinc sulfide-based phosphorescent phosphor such as, for example, an alkaline earth metal aluminate activated with europium or the like can be used. It is preferable to use an alkaline earth metal aluminate activated with europium or the like in terms of light resistance, chemical stability, sustained luminous ability and the like. The alkaline earth metal constituting the phosphorescent phosphor is strontium, barium, calcium or the like. Specifically, after sufficiently mixing the alkaline earth metal salt with alumina and europium, nitrogen-hydrogen is mixed with an electric furnace. Examples thereof include those obtained by firing in a mixed gas stream.

The phosphorescent phosphor particles have an average particle size of 0.3 to 0.3.
It needs to be 10 μm. The particle size is 0.3 μm
If it is less than 2, secondary agglomeration is liable to occur, resulting in inferior fibrillation processability and inferior persistence. On the other hand, if it exceeds 10 μm, there is a high possibility that the particles will be exposed on the fiber surface depending on the composite form of the fiber, which will be described later. In addition, it becomes difficult to obtain a single-filament fine yarn for general clothing. Therefore, the particle diameter of the phosphorescent phosphor particles is preferably in the range of 0.3 to 8.0 [mu] m, particularly 0.5 to 6.0 [mu] m in consideration of the fiberization processability and afterglow.

The content of the phosphorescent phosphor particles in the fiber is in the range of 1 to 10% by weight based on the polymer (A).
In particular, it is preferably in the range of 1 to 8% by weight. When the content is less than 1% by weight, the effect of exhibiting the phosphorescent function is small, and a long-term afterglow characteristic cannot be obtained. On the other hand, if the content exceeds 10% by weight, depending on the particle size of the particles to be contained, the flowability of the polymer (A) containing the particles is reduced, the spinnability is extremely deteriorated, and the filter is clogged. The pack life is significantly shortened, and the stability of the fiberization process is lost.

In the present invention, the difference in melting point or softening point between the fiber-forming polymer (A) containing the above-mentioned phosphorescent phosphor particles and the other fiber-forming polymer (B) is 20 to 1.
The temperature of 00 ° C. is necessary in terms of spinnability and stretchability. It is preferably from 20 to 80C, particularly preferably from 20 to 60C. If the difference in melting point is out of the range, the melt viscosity balance between the polymer (A) and the polymer (B) during composite spinning becomes poor, and it is difficult to obtain a satisfactory composite fiber. In some cases, peeling between polymers of the obtained conjugate fiber occurs, which is problematic in terms of durability. The "melting point or softening point" defined in the present invention indicates the melting point or softening point of each polymer constituting the fiberized fiber.

As the polymer (A), those having a melting point or softening point of 230 ° C. or less are preferred. When the melting point or the softening point exceeds 230 ° C., when melt-mixed with the above-mentioned phosphorescent phosphor particles, a decomposition gas considered to be due to its heat resistance is generated, and the melt-mixing may not be performed satisfactorily. . Preferred polymer (A) is one having a melting point or softening point of 140 to 230 ° C. Specific examples of the polymer (A) include high-density polyethylene (H
Polyolefins such as DPE), polypropylene, modified polyethylene, and modified polypropylene; polyamides such as nylon 12, nylon 11, nylon 6, and nylon elastomer; polybutylene terephthalate, polyhexamethylene terephthalate, and copolymerized polyester And the like. The copolymerized polyester has a third component copolymerized so as to be lower than the melting point or softening point of the polymer (B) described later. For example, polyethylene terephthalate is used as the polymer (B). In this case, a polyethylene terephthalate in which a third component having a melting point lower than that of the polyethylene terephthalate is copolymerized can be used. Examples of the third component include dicarboxylic acid components such as isophthalic acid, adipic acid, sebacic acid, and phthalic acid, and diol components such as ethylene glycol, propylene glycol, and cyclohexanedimethanol.

The conjugate fiber of the present invention is formed from the polymer (A) and the polymer (B) containing the phosphorescent particles. Needless to say, the polymer (B) is capable of forming fibers, and is preferably a polymer having a melting point or softening point of 200 ° C. or higher. The polymer (B) plays an important role in improving the consumption performance including heat resistance and the processability during fiberization, and should be a crystalline polymer in consideration of spinnability. Are preferred and the melting point is 2
It is preferably 80 ° C. or lower.

Examples of the polymer (B) include polyester, polyamide and the like. Examples of the polyester include terephthalic acid, isophthalic acid, naphthalene 2,6-dicarboxylic acid, phthalic acid, α, β- (4-
(Carboxyphenoxy) ethane, aromatic dicarboxylic acids such as 4,4'-dicarboxydiphenyl, 5-sodium sulfoisophthalic acid; aliphatic dicarboxylic acids such as adipic acid and sebacic acid or esters thereof and ethylene glycol, diethylene glycol Diol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, cyclohexane-1,4-dimethanol, polyethylene glycol, polytetramethylene glycol, etc. And a fiber-forming polyester which is polycondensed from a polyester compound. Examples of the polyamide include aliphatic polyamides such as nylon 6, nylon 66, and nylon 12; semi-aromatic polyamides formed from an aromatic diamine and an aliphatic dicarboxylic acid or an aliphatic diamine and an aromatic dicarboxylic acid. These polymers (B) may contain additives such as a fluorescent brightener, an ultraviolet absorber and a stabilizer.

In the present invention, the above-mentioned polymer (A)
And polymer (B), the melting point or softening point difference of which is 20
A combination of polymers can be set as appropriate so as to be in the range of -100 ° C. Specific examples of the polymer (A) / polymer (B) include nylon 6 / polyethylene terephthalate, nylon 12 / nylon 6, and polypropylene / polyethylene terephthalate.

The phosphorescent fiber of the present invention is a fiber in which the polymer (A) and the polymer (B) containing the phosphorescent particles are bonded, and 70% or more of the fiber surface is covered with the polymer.
(B) and 20 to 80% by weight of the polymer (B) with respect to the whole fiber. Polymer (B) in fiber is 70% of fiber surface
When the occupancy is less than that, it is not possible to obtain a favorable luminous property and a long-term afterglow property. That is, when the amount of the polymer (A) existing in the fiber surface layer increases, the amount of the phosphorescent particles existing in the fiber surface layer increases, and the particles become more susceptible to heat and undergo thermal decomposition such as air oxidation. It will be easier. Therefore, the polymer (B) occupying the fiber surface is preferably at least 80%.

That is, the polymer (A) containing the phosphorescent particles is formed into a sheath so as to be a surface layer of the fiber,
If the constitutional requirements of the fiber of the present invention having (B) as the core are reversed, the resulting fiber will not have satisfactory luminous properties and long-term afterglow. In the present invention, the polymer (A) containing the phosphorescent particles is the polymer (B).
It is considered that this is not preferable from the viewpoint of exhibiting the luminous property of the phosphorescent phosphor particles and the afterglow property over a long period of time because the phosphorescent particles are mostly covered by the coating and are not exposed on the fiber surface. The weak point such as decomposition of the phosphorescent particles at a high temperature, which is not recognized, can be sufficiently overcome. Further, even if the phosphorescent phosphor particles contained in the polymer (A) have a large particle size and the surface of the fiber made of the polymer (A) has irregularities caused by the particles,
Since the fiber surface composed of the polymer (A) is covered by (B), the fiber surface of the present invention is smooth.

Further, the luminous fiber of the present invention has excellent durability in actual wearing. That is, the fiber is usually used for a long time, bending, pulling, repeated wear and the like,
Washing, rinsing, and the like are repeated, but if the phosphorescent phosphor particles are present on the fiber surface, the phosphorescent phosphor particles are inevitably damaged or dropped, and the phosphorescent performance is reduced. However, in the present invention, since the polymer (B) almost occupies the fiber surface as described above, such a problem is almost eliminated. The fiber structure of the present invention exhibits excellent heat resistance, excellent consumption performance including dimensional stability, excellent luminous performance, and long-lasting persistence when used as a fiber or a textile product such as a woven or knitted fabric that is used for the fiber structure. I do. Further, as will be described later, dyeing of the polymer (B) is possible.

The fiber of the present invention is a polymer as described above.
It is also an important factor that (B) occupies 20 to 80% by weight based on the whole fiber. 20% by weight of polymer (B)
If it is less than 1, the spinnability and stretchability of the composite yarn and the fiber properties are extremely reduced even if the polymer (B) has a sufficient fiber-forming property, and the practicality is lost. Will be. This is a polymer containing phosphorescent phosphor particles.
It can be inferred that the ratio of (A) to the whole fiber increases, and the properties of the polymer (A) having poor spinnability appear as physical properties of the whole fiber. On the other hand, if the content of the polymer (B) exceeds 80% by weight, it becomes difficult to spin a composite fiber structure of a stable composite form, the amount of the polymer (A) containing the phosphorescent particles is reduced, and the phosphorescent and afterglow properties are reduced. Will be inferior. Therefore, the weight ratio of the polymer (A) to the polymer (B) is (A) / (B) = 25: 75 to 75/25, especially 30.
/ 70, 70/30.

As described above, the composite form of the phosphorescent fiber of the present invention is not particularly limited as long as the polymer (B) occupies 70% or more of the fiber surface. Is a core-sheath structure type in which the polymer (A) has a core portion and the polymer (B) has a sheath portion, and the polymer (A) is contained in the polymer (B).
Is a plurality of islands, a sea-island structure type, a three-layer structure type of polymer (B) -polymer- (A) -polymer- (B) from the center, and polymer (A) in polymer (B). Is a structural type in which a part thereof is exposed to the surface and has a pot-like or circular shape, a structural type in which a polymer (B) is divided into several blocks by a polymer (A), a polymer (A) ) And the polymer (B) in a composite form such as a multilayer laminated structure type. Considering the consumption performance such as the decomposability and heat resistance of the phosphorescent phosphor particles during melt spinning, polymer
A composite structure type in which (A) is completely covered with polymer (B) is preferred.

The cross-sectional shape of the fiber of the present invention is not limited to a round cross-sectional shape, but may be a modified cross-sectional shape such as a polygonal shape such as a three-octagonal shape or a multi-lobed shape such as a three-octahedral shape. Good. Further, it may be a solid fiber or a hollow fiber.

Although the fiber of the present invention is mainly used for clothing, it can be used not only for clothing but also for industrial materials.
When used for clothing, the fineness is preferably 8 denier or less. The fineness is not limited in industrial material applications, and can be appropriately set depending on the industrial material application. The fiber can be obtained by a composite spinning method known per se. As a specific fiberizing means, a normal spinning may be performed at a speed of 2500 m / min or less, and then a drawing heat treatment may be performed.
A method of spinning at a speed of 1500 to 5000 m / min, followed by drawing and false twisting may be used, or a method of spinning at a high speed of 5000 m / min or more and omitting the drawing step depending on the application may be used. Is adopted.

In the present invention, the term "fiber" refers to filaments, staples, twisted yarns, processed yarns, and the like of these yarns.
It is a generic term for spun yarn. The term "textile product" is a generic term for a woven or knitted fabric, a nonwoven fabric, or the like containing the fiber of the present invention.

Since the polymer (B) occupies most of the fiber surface of the fiber of the present invention, dyeing the polymer (B) can be widely used for clothing. For example, when polyester is used as the polymer (B), dyeing with a disperse dye or a cationic dye is possible,
When polyamide is used, dyeing with an acid dye or a metal-containing dye is possible.

As described above, since the majority of the fiber surface is occupied by the polymer (B), the phosphorescent fiber of the present invention has no phosphorescent phosphor particles falling off or thermally decomposed. Properties, long-term persistence, and, depending on the type of the polymer (B), excellent heat resistance and iron resistance, and since it can be dyed, it can be widely used for clothing. . Specific examples of fiber products using the fibers include curtains, on walls, carpets, and raincoats.
Work clothes, hats, signs, lampshades, artificial flowers, work ropes, tent ropes, emergency passage carpets, and the like.

[0025]

EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited to these examples. Each physical property value in the examples is a value measured and calculated by the following method. (1) Melting point or softening point (° C.) of polymer Melting point is measured by a differential scanning calorimeter (DSC) [Metra Co., Ltd., T
C-2000 type] at a heating rate of 10 ° C./min, and the temperature at which an endothermic peak was developed was taken as the melting point. The softening point is J
It measured based on ISK7206-1982. (2) Particle size (μm) of phosphorescent phosphor particles The average particle size was calculated using a particle size distribution analyzer. (3) after clearing the afterglow Store in the sample for approximately 15 hours dark decay characteristic certain amount, the brightness of 200 lux by D ₆₅ standard light source 1
Irradiated for 0 minutes. The sample 20 hours after the irradiation was visually observed. The evaluation was performed according to the following evaluation criteria. Evaluation criteria: A: Afterglow at the same level as afterglow immediately after irradiation could be sufficiently observed with the naked eye. ：: Although inferior to the afterglow immediately after irradiation, afterglow with the naked eye could be observed. Δ: Afterglow was finally observed with the naked eye. ×: Afterglow could not be observed with the naked eye. (4) Washing durability A synthetic detergent for clothing is added and dissolved at a rate of 2 g in 1 liter of water at a liquid temperature of 40 ° C. to prepare a washing liquid. This washing liquid has a bath ratio of 1
The sample and the load cloth are supplied so as to form a pair 30, and the operation is started. After the treatment for 5 minutes, the operation was stopped, the sample and the load cloth were dehydrated with a dehydrator, and then the washing liquid was replaced with a new liquid having a liquid temperature of 40 ° C., rinsed at the same bath ratio for 2 minutes, and then dehydrated. And rinsed again for 2 minutes and air-dried. The afterglow characteristics after repeating this 50 times were observed by the above-mentioned method. The evaluation criteria are shown below. Evaluation criteria: ：: Afterglow was sufficiently observed with the naked eye. Δ: Afterglow was reasonably observed with the naked eye. ×: No afterglow was observed. (5) Thermal stability (evaluated by dry heat shrinkage) The sample was 4000 denier using a scale measuring machine with a frame circumference of 1.0 m.
Make a skein and measure the skein length with a 1/20 g / denier weight. Next, remove the weight, fold it in half, and
Hang under a load of 0.5 mg / denier in a dryer at 30 ° C., leave it for 30 minutes, take it out, cool it to room temperature, put a weight again, measure the length, and then measure [(length before drying-drying Length after drying) / length before drying], and the following evaluation was performed. ：: Dry heat shrinkage less than 20% △: Dry heat shrinkage 20 to 40% ×: Dry heat shrinkage exceeds 40%

Example 1 Nylon 6 containing 5% by weight of phosphorescent phosphor particles (manufactured by Nemoto Specialty Chemicals) having an average particle size of 5 μm (manufactured by Ube Industries, Ltd., 1013)
BK-1, melting point 225 ° C.] [Polymer (A)] and polyethylene terephthalate [melting point 258 ° C.]
(B)] in a separate extruder, and using a composite spinning apparatus, a core-sheath type structure such that the polymer (A) forms a core and the polymer (B) forms a sheath. Fiber at 295 ° C for 8
It was spun from the nozzle hole of the hole and wound up at a speed of 1000 m / min. The core / sheath composite ratio was 1/2 (weight ratio). Then, the spun yarn is subjected to a hot roller temperature of 80 ° C., a hot plate temperature of 150 ° C., and a magnification of 3.1 using an ordinary drawing machine.
The drawn yarn was drawn twice to obtain a drawn yarn of 150 denier / 8 filaments. A knitted tubular knitted fabric was produced using the obtained drawn yarn, and each evaluation of the tubular knitted fabric was performed. Table 1 shows the results. It had excellent luminous properties, afterglow washing durability, and excellent heat resistance.

Example 2 A fiber having a core-sheath structure was spun and drawn in the same manner as in Example 1 except that polypropylene (melting point: 170 ° C.) was used instead of nylon 6. A knitted tubular knitted fabric was produced using the obtained drawn yarn, and each evaluation of the tubular knitted fabric was performed. Table 1 shows the results. It was excellent in luminous properties and afterglow washing durability, and also excellent in heat resistance.

Example 3 In Example 1, 2.5 mol% of 5-sodium sulfoisophthalic acid-modified polyethylene terephthalate (melting point: 254 ° C.) was used in place of polyethylene terephthalate, and the composite ratio was A / A. A fiber having a core-sheath structure was spun and stretched in the same manner except that B = 2/3 (weight ratio).
A knitted tubular knitted fabric is produced using the obtained drawn yarn,
Each evaluation of the tubular knitted fabric was performed. Table 1 shows the results. Luminous,
Also, it was excellent in afterglow washing durability and also excellent in heat resistance.

Example 4 A fiber having a core-in-sheath structure was spun and drawn in the same manner as in Example 2, except that polybutylene terephthalate having a melting point of 227 ° C. was used as a sheath component. Spinning temperature is 2
The test was performed at 65 ° C and a hot roller temperature of 65 ° C. A knitted tubular knitted fabric was produced using the obtained drawn yarn, and each evaluation of the tubular knitted fabric was performed. Table 1 shows the results. It was excellent in luminous properties and afterglow washing durability, and also excellent in heat resistance.

Example 5 In the same manner as in Example 1, a core-sheath type structural fiber was spun and stretched to obtain a 150 denier / 32 filament drawn yarn. A knitted tubular knitted fabric was produced using the obtained drawn yarn, and each evaluation of the tubular knitted fabric was performed. Table 1 shows the results. It was excellent in luminous properties and afterglow washing durability, and also excellent in heat resistance.

Example 6 In Example 5, the melting point was 170 ° C. instead of nylon 6.
Was spun and stretched in the same manner except that the composite form was changed to an 11-layer laminated type (composite ratio A / B = 1/3) to obtain a drawn yarn of 150 denier / 32 filaments. . Polyethylene terephthalate accounted for 73% of the fiber surface. A knitted tubular knitted fabric was produced using the obtained drawn yarn, and each evaluation of the tubular knitted fabric was performed. Table 1 shows the results. It was excellent in luminous properties and afterglow washing durability, and also excellent in heat resistance.

Example 7 Nylon 12 having a melting point of 168 ° C. was used as a polymer (A) containing phosphorescent fluorescent particles, and 10 mol% of isophthalic acid-modified polybutylene terephthalate (melting point) was used as a polymer (B). Spinning and drawing were performed in the same manner as in Example 1 except that the temperature was 203 ° C.) to obtain a drawn yarn of 150 denier / 8 filaments. The spinning temperature was 250 ° C and the hot roller temperature was 60 ° C. A knitted tubular knitted fabric was produced using the obtained drawn yarn, and each evaluation of the tubular knitted fabric was performed.
Table 1 shows the results. It had excellent luminous properties, afterglow washing durability, and excellent heat resistance.

Example 8 Spinning and stretching were performed in the same manner as in Example 1 except that the composite ratio was changed to A / B = 1/1 (weight ratio).
A denier / 8 filament drawn yarn was obtained. A knitted tubular knitted fabric was produced using the obtained drawn yarn, and each evaluation of the tubular knitted fabric was performed. Table 1 shows the results. It had excellent luminous properties, afterglow washing durability, and excellent heat resistance.

Comparative Example 1 Spinning and stretching were carried out in the same manner as in Example 2 except that polypropylene containing phosphorescent particles was used for the sheath and polyethylene terephthalate was used for the core, to give 150 denier / 8. A drawn filament was obtained. A knitted tubular knitted fabric was produced using the obtained drawn yarn, and each evaluation of the tubular knitted fabric was performed. Table 1 shows the results. Although the phosphorescent properties and the afterglow properties were good, the fiber-forming process was poor due to the fact that the polymer containing the particles constituted the sheath, and thread breakage and fluffing occurred frequently.

Comparative Example 2 Spinning and stretching were performed in the same manner as in Example 2 except that the composite ratio was changed to polymer (A) / polymer (B) = 1/5 (weight ratio), and 150 denier was obtained. / 8 filament drawn yarn was obtained. A knitted tubular knitted fabric was produced using the obtained drawn yarn, and each evaluation of the tubular knitted fabric was performed. Table 1 shows the results. Although the thermal stability was good, the phosphorescent property and the afterglow property were poor due to the large composite ratio of the polymer (B).

Comparative Example 3 Spinning and stretching were performed in the same manner as in Example 2 except that the composite ratio was changed to polymer (A) / polymer (B) = 5/1 (weight ratio), and 150 denier was obtained. / 8 filament drawn yarn was obtained. A knitted tubular knitted fabric was produced using the obtained drawn yarn, and each evaluation of the tubular knitted fabric was performed. Table 1 shows the results. Since the composite ratio of the polymer (A) was large, the phosphorescent property and the afterglow property were good, but the fiberization processability was poor. The composite balance was inferior due to the decrease in viscosity, and the fiberization processability was poor.

Comparative Example 4 In Example 2, spinning and drawing were performed in the same manner as in Example 2 except that the composite cross-section was changed to a side-by-side type, to obtain a drawn yarn of 150 denier / 8 filaments. A knitted tubular knitted fabric was produced using the obtained drawn yarn, and each evaluation of the tubular knitted fabric was performed. Table 1 shows the results. Since the polymer (A) occupies 50% of the fiber surface, the fiberization processability was poor and the thermal stability was just one step away.

Comparative Examples 5 to 6 Using a polypropylene single yarn containing phosphorescent particles (Comparative Example 5) and nylon 6 containing phosphorescent particles (Comparative Example 6), spun and stretched to give 150 denier / 8. A drawn filament was obtained. A knitted tubular knitted fabric was produced using the obtained drawn yarn, and each evaluation of the tubular knitted fabric was performed. Table 1 shows the results. In all cases, the fiberization processability was poor, and even if the afterglow characteristics were good, they were not practical due to poor dimensional stability and consumption performance.

Comparative Examples 7 and 8 Polymers (A) Containing Phosphorescent Fluorescent Particles and Constituting Core
And a core-sheath type composite fiber having the same kind of polymer (B) as the sheath portion was spun and drawn to obtain a drawn yarn of 150 denier / 8 filaments. A knitted tubular knitted fabric was produced using the obtained drawn yarn, and each evaluation of the tubular knitted fabric was performed. Table 1 shows the results. Although the phosphorescent properties were good, the fiberization processability and thermal stability were poor, making it unsuitable for use in clothing.

Comparative Example 9 In Comparative Example 8, the polymer (A) constituting the core was
Spinning and drawing were performed in the same manner except that polyethylene having a melting point of 125 ° C. was used to obtain a drawn yarn of 150 denier / 8 filaments. A knitted tubular knitted fabric was produced using the obtained drawn yarn, and each evaluation of the tubular knitted fabric was performed. Table 1 shows the results. Since the difference in melting point between the polymer (A) and the polymer (B) is large, the phosphorescent property is one more and the fiber forming process is also one.

[0041]

[Table 1]

[0042]

Industrial Applicability The phosphorescent fiber of the present invention is not only excellent in afterglow properties for a long period of time, but also has excellent consumption performance such as dyeability and heat resistance, and is very useful for clothing.

Claims (2)

[Claims] 1. A conjugate fiber comprising a fiber-forming polymer (A) containing phosphorescent phosphor particles having an average particle diameter of 0.3 to 10 μm and a fiber-forming polymer (B), The fibers are: (i) a difference between the melting point or softening point of the fiber-forming polymer (A) and the melting point or softening point of the fiber-forming polymer (B) is 20 to 100 ° C .; (I) the fiber-forming polymer (B) occupies 70% or more of the fiber surface; and (iii) the fiber-forming polymer (B) accounts for 20 to 80% by weight of the whole fiber. Luminous fiber. 2. A fiber product comprising the luminous fiber according to claim 1.