JP2008025066A - Flame-retardant clothing fiber product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flame-retardant clothing fiber product used as a special type garment fiber product, particularly, such as a child garment or a shirt or nightwear for aged persons, and working wear worn at a construction site, a kitchen, a gas station or the like, a fireman uniform, a camouflage uniform for Self-Defense Forces, causing no drip of the raw material when burned, excellent in flame-retardant performance, and excellent in wash-durability or dry cleaning durability. <P>SOLUTION: The flame-retardant clothing fiber product includes a garment fiber product containing polyester fibers, wherein the polyester fibers includes a silicone-based compound having a constituent unit shown by RSiO<SB>1.5</SB>(R is an organic group), and a compound having an imidd structure, and free from drip (melted drip) in a flame-retardant test defined by a vertical methane burner method according to the standard of the performance test of a flame-retardant product which is defined by the Japan Fire Retardant Association. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a flame-retardant clothing fiber product containing polyester fiber, and more particularly to a clothing fiber product that has no drip (melting dripping) due to melting at the time of combustion and has improved flame-retardant performance. is there.

  In recent years, there has been a strong demand for garment fiber products to be flame retardant in order to prevent burns during a fire. In addition, the danger of secondary disasters such as burns due to drip (melting dripping) at the time of combustion of thermoplastic fibers is also sought, and a technique for suppressing drip is strongly demanded.

  Conventionally, as a flame retardant technique for polyester fibers, etc., a lot of clothing fiber products containing chlorine-containing flame retardants, halogen-containing flame retardants such as bromine-containing flame retardants, or halogen-based flame retardants and antimony flame retardants have been proposed. Has been.

  In recent years, clothing fiber products containing phosphorus compounds have been proposed to suppress the generation of harmful gases during combustion (see Patent Document 1).

  However, although this example is excellent in flame retardancy, it tends to promote drip at the time of combustion, so the problem of secondary disaster caused by drip cannot be solved.

In order to solve these problems, studies using silicone compounds have been conducted. This silicone compound is monofunctional R ₃ SiO _0.5 (M unit), bifunctional R ₂ SiO _1.0 (D unit), trifunctional RSiO _1.5 (T unit), 4 It is composed of any one of units represented by functional SiO _2.0 (Q unit).

  As an example of using a silicone-based compound, a silicone oil having a functional group and an organophosphorus compound are included in the fiber structure, and the improvement of the drip suppression effect, the suppression of the generation of toxic gas, and the prevention of the deterioration of the mechanical properties are studied. (Refer to Patent Document 2) However, the flame retardant performance does not reach that of halogen flame retardants, and there are still problems with the current technology, such as drug dropout during washing and dry cleaning, and there is a problem with durability. ing.

In addition, there is one in which a silicone resin is contained in a fiber structure and the dispersion state of the silicone resin is defined (see Patent Document 3). Certainly this example has some flame retardancy and drip suppression effects, and is also excellent in environmental and safety, but it is still a challenge to improve further flame retardancy and drip suppression effects. This technology has not yet solved various problems.
JP 2001-262466 A (Claim 1 and paragraph [0051]) JP 09-268423 A (Claim 1) Japanese Patent Laying-Open No. 2005-097819 (Claim 1)

  In view of the above-mentioned present situation, the present invention has an object to provide a clothing fiber product in which the flame retardancy of the clothing fiber product is improved, and the drip suppression effect at the time of combustion is improved, and which is excellent in washing durability and dry cleaning durability. To do.

The present invention adopts the following configuration in order to solve the above problems. That is,
(1) A clothing fiber product containing a polyester fiber, which contains a silicone compound having a constitutional unit represented by RSiO _1.5 (R is an organic group) and a compound having an imide structure in the polyester fiber. A flame-retardant garment textile product characterized by having no drip (melting dripping) in a flameproof test specified in the vertical methane burner method of the flameproof product performance test standard defined by the Flameproof Association.
(2) The organic group R constituting the silicone compound contains a phenyl group, and the content of the phenyl group is 30 mol% or more in terms of a molar ratio with respect to all organic groups constituting the silicone compound. The flame-retardant clothing fiber product according to (1).
(3) The flame retardant clothing according to (1) or (2), wherein the silanol group content contained in the silicone compound is 2% or more and 10% or less by weight with respect to the silicone compound. Fiber products.
(4) The flame-retardant clothing fiber product according to any one of (1) to (3), wherein the compound having an imide structure is a polyetherimide.

  According to the present invention, flame retardant and drip-suppressing effects are high in applications used as clothing textile products, particularly in clothing related to uniforms such as work clothes and special clothing such as fire fighting clothes, and are also suitable for washing durability and dryness. It is possible to provide apparel textile products with excellent cleaning durability.

  Hereinafter, the present invention will be described in detail.

As described above, the silicone compound is monofunctional R ₃ SiO _0.5 (M unit), bifunctional R ₂ SiO _1.0 (D unit), trifunctional RSiO _1.5 (T Unit) is composed of any of the units represented by tetrafunctional SiO _2.0 (Q unit), and the silicone compound referred to in the present invention is trifunctional RSiO _1.5 polyester fiber. It contains at least inside. By including a unit represented by RSiO _1.5 (T unit) in the structure of the silicone compound, the heat resistance of the silicone compound is improved, and a clothing fiber product having high flame retardancy can be obtained.

From the viewpoint of heat resistance and flame retardancy, the content of RSiO _1.5 is preferably 20% or more, more preferably 50% or more, in terms of molar ratio to the silicone compound.

  Further, in the present invention, from the viewpoint of dispersibility and flame retardancy in polyester fibers, the organic group constituting the silicone compound contains a phenyl group, and the content of the phenyl group is the total organic group constituting the silicone compound. The molar ratio is preferably 30% or more, more preferably 60% or more.

  The amount of silanol groups in the silicone compound is preferably 2% or more by weight with respect to the silicone compound in order to have sufficient flame retardancy, and preferably 10% or less from the viewpoint of processability. Preferably they are 3% or more and 8% or less. Here, the amount of silanol groups is the weight of OH groups bonded to Si in the silicone compound. By making the amount of silanol groups within the range of the present invention, it is possible to efficiently form a crosslinked structure with a polyester fiber at the time of combustion, and to improve the flame retardancy and drip suppression effect.

  Further, the amount average molecular weight of the silicone compound is preferably 500 or more, since the melt viscosity is high when the silicone compound is melt-kneaded, and the dispersibility to fibers is good. From the viewpoint of sex. More preferably, it is 1000 or more and 100,000 or less, More preferably, it is 3000 or more and 50000 or less.

  Next, the compound having an imide structure of the present invention is a compound having a structure of -CO-NR-CO- (R is an organic group) in the molecular structure.

  By containing the compound having an imide structure and the silicone compound in the polyester fiber, it is possible for the silicone compound, the compound having the imide structure and the polyester fiber to efficiently form a carbonized layer during combustion, This can remarkably improve the flame retardancy and drip suppression effect as compared with the case where each of the silicone compound and the compound having an imide structure is contained alone.

  Moreover, the compound which has an imide structure has a thermoplastic thing from a point of workability. That is, the glass transition temperature is preferably 130 ° C. or higher and 300 ° C. or lower, more preferably 130 ° C. or higher and 250 ° C. or lower.

  Specific examples of the compound having an imide structure include polyimide, polyamideimide, and polyetherimide. Among them, polyetherimide is preferable from the viewpoint of workability, but the molecular structure has an imide structure. This is not the case.

The content ratio of the silicone compound contained in the polyester fiber and the compound having an imide structure is preferably in the range of 5 (silicone compound): 95 (compound having an imide structure) to 95: 5 by weight ratio, The range of 10:90 to 90:10 is preferable.
The composition ratio of the polyester fiber of the present invention is 94 (polyester fiber): 1 (silicone compound): 5 (compound having an imide structure) to 40 in terms of weight ratio from the viewpoint of flame retardancy and drip suppression effect. : 20: 40 is preferable, and 90: 3: 7 to 70:10:20 is more preferable.

  The polyester fiber of the present invention is a polymer synthesized from a dicarboxylic acid such as polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate or the like and an ester-forming derivative thereof and a diol or an ester-forming derivative thereof, as well as poly-L-lactic acid, These are non-petroleum polyester compounds of poly-D-lactic acid, and these may be used alone or in combination of two or more, such as mixed spinning and mixed fiber.

  The clothing textile products obtained by the present invention are, for example, children's clothing, shirts for the elderly, and nightwear among clothing products, as well as work clothes such as construction sites, kitchens, gas stations, fire fighting clothing, and SDF camouflage clothing. Special clothing such as.

  The garment fiber product of the present invention preferably contains 30% by weight or more of polyester fiber in terms of weight ratio from the viewpoint of flame retardancy and drip suppression effect, and within the range not impairing flame retardancy and drip suppression effect. Synthetic fibers and natural fibers can be mixed.

  The form of the polyester fiber used in the clothing fiber product is, for example, a multifilament in which the single yarn fineness is in the range of 0.1 dtex to tens of dtex, and the total fineness is in the range of 50 to 300 dtex and the number of filaments is in the range of 10 to 100. Is mentioned.

  In addition, the filaments thus obtained can be woven into a woven fabric such as a three-layered structure or a changed structure, which is a single structure, or a double structure or a double structure, which is a double structure, to be obtained as a clothing fiber product. Can do.

Moreover, the fabric weight of the clothing fiber product at this time is in the range of 50 g / m ² or more and 800 g / m ² or less.

  In addition to multifilaments, short fibers, woven fabrics composed of short fibers, and non-woven fabrics can be used depending on the application, and the present invention is not limited to the form of fibers or the texture of the fabrics.

  Further, the garment fiber product of the present invention is characterized in that there is no drip (melting dripping) in the flameproof test defined in the flameproof test defined in the vertical methane burner method of the flameproof product performance test standard.

  In the flame proof test of the vertical methane burner method, a total of 6 8.9 cm × 25.4 cm are collected from the fabric portion and 3 from the transverse direction, and 5 of them are adopted for the test. The collected specimen is attached to a support frame, set vertically, and the carbonization length when flame contacted with a methane burner from below the sample and the flame ignitability to gauze placed under the specimen are evaluated. The shorter the length, the higher the flame retardancy, and the evaluation standard is that there is no ignition of gauze. The present invention is characterized in that there is no drip at the time of this flameproof test, and the drip is a molten drop from a sample.

  Moreover, since the clothing fiber product of this invention contains a silicone type compound and an imide structure containing compound in a polyester type fiber, it is excellent in washing durability or dry cleaning durability. Reproducibility of flame retardant performance after washing and dry cleaning is important for flame retardant clothing textile products, and interior textile products that have exhausted the flame retardant in post-processing have the performance of the flame retardant falling off during washing and dry cleaning. There is a limit to reproducibility. However, the present invention is excellent in washing durability and dry cleaning durability because silicone compounds and imide structure-containing compounds do not fall off during washing and dry cleaning.

  Next, the manufacturing method of the present invention will be described in detail.

The silicone compound can be produced by general polycondensation. For example, R ₃ SiOCl (triorganochlorosilane), R ₂ SiOCl ₂ (diorganodichlorosilane), RSiOCl ₃ (monoorganotrichlorosilane), and SiOCl ₄ (tetrachlorosilane) are used as monomers and condensed under an acid or alkali catalyst. A silicone compound is synthesized. R ₃ SiOCl (corresponding to M unit), R ₂ SiOCl ₂ (corresponding to D unit), RSiOCl ₃ (corresponding to T unit), R ₃ SiOCl (corresponding to D unit), R ₃ SiOCl ₂ (corresponding to D unit), The molar ratio of SiOCl ₄ (corresponding to the Q unit) is adjusted.

  Further, the content of the organic group R contained in the silicone compound is governed by the content of the organic group R in the monomer. Therefore, the content of the phenyl group contained in the silicone compound can be adjusted by substituting the desired amount of R in the monomer with a phenyl group.

The content of silanol groups contained in the silicone compound can be controlled by the reaction time. It is also possible to control the content of silanol groups by reacting R ₃ SiOCl or R ₃ SiOH with a silanol group as a blocking agent. The content of silanol groups is the peak area (integral value) of SiO _2.0 , RSiO _1.5 , R ₂ SiO _1.0 , and R ₃ SiO _0.5 derived from a structure not containing a silanol group in ²⁹ Si-NMR. ) And a silanol group-containing Si (OH) ₄ , SiO _0.5 (OH) ₃ , SiO _1.0 (OH) ₂ , SiO _1.5 (OH), RSi (OH) ₃ , RSiO _{0 .5} (OH) ₂ , RSiO _1.0 (OH), R ₂ Si (OH) ₂ , R ₂ SiO _0.5 (OH), R ₃ Si (OH) from the ratio of peak areas (integrated values) It is possible to calculate.

For example, if the silicone compound is composed only of _{RSiO 1.5} and _RSiO 1.0 _(OH), the ratio of the integrated value of the _{RSiO 1.5} and _RSiO 1.0 (OH) is 1.5 _{(RSiO 1.5} ): 1.0 (RSiO _1.0 (OH)) can be obtained as in the following formula 1.
(Formula 1)
Silanol group content (wt%)
= {(17 × the ratio of the integrated value of _{RSiO 1.0 (OH)) / (} RSiO 1.0 (OH) of molecular weight × _{RSiO 1.0} (OH) of the integrated value of the ratio + _{RSiO 1.5} molecular weight × RSiO _1.5 integral value ratio)} × 100
= {(17 × 1.0) / (138 × 1.0 + 129 × 1.5)} × 100
= 5.13
Moreover, the weight average molecular weight of a silicone type compound is controllable by the reaction time at the time of manufacture. The molecular weight can be measured by gel permeation chromatography (GPC) and calculated in terms of polystyrene.

  As a method for imparting a silicone compound and a compound having an imide structure to a fiber structure, a method of adding at the time of polymerization of a polyester fiber, a polyester fiber and these compounds are dissolved in a solvent, mixed and then dried. Examples thereof include, but are not limited to, a method of melt-mixing polyester fibers and these compounds with a kneader such as a biaxial extruder or a Banbury mixer. From the viewpoint that the compound having a structure can be sufficiently dispersed and stably produced, a method of melt-mixing with a kneader such as a twin screw extruder or a Banbury mixer is preferred.

  Next, the manufacturing method of a polyester fiber is demonstrated.

  As a manufacturing method of a polyester fiber, the method of manufacturing using a melt spinning machine is mentioned, for example.

  For example, after mixing a polyester fiber, a silicone compound, and an imide structure-containing compound by the method described above, and cutting the obtained resin composition into a 3 mm square chip shape, the chip is charged into a hopper of a melt spinning machine. The polyester fiber can be obtained by melting at a temperature equal to or higher than the melting temperature of the polyester fiber and discharging from the base. Moreover, it can use suitably as a fiber used for clothing textile products by extending | stretching and thread-processing the polyester-type fiber obtained at this time.

  Next, the manufacturing method of clothing textile products is demonstrated.

  The manufacturing method can be manufactured by a known method, and weaving using the polyester fiber obtained by the above-described method, and manufacturing a garment fiber product through processes such as scouring, intermediate setting, dyeing and washing. It is possible.

  Here, the process conditions such as scouring, intermediate setting, and dyeing can be processed under the same conditions as those for the polyester fiber alone. For example, in scouring, 1 to 50 g / L of sodium carbonate using a liquid dyeing machine, interface It can be processed under the conditions of 1 to 50 g / L of activator, processing temperature 60 to 100 ° C., processing time 10 minutes to 60 minutes, and the intermediate set is processed at a processing temperature 130 ° C. to 200 ° C. using a tenter, and the processing time 30 seconds to It can be processed under conditions of 5 minutes, and dyeing can be carried out using a flow dyeing machine or the like to dye disperse dyes at a desired concentration under conditions of a processing temperature of 120 ° C to 200 ° C and a processing time of 10 minutes to 2 hours. It is.

  Thereafter, it can be manufactured as a garment fiber product through a cutting process and a sewing process.

  Hereinafter, the present invention will be described more specifically with reference to examples.

  First, the silicone compounds in Examples and Comparative Examples were prepared as follows, and silicone compounds 1 to 6 shown in Table 1 were obtained.

<Preparation of proportions of M, D, T, and Q units>
R ₃ SiOCl (corresponding to R ₃ SiO _0.5 ), R ₂ SiOCl ₂ (corresponding to R ₂ SiO _1.0 ), RSiOCl ₃ (corresponding to RSiO _1.5 ), SiOCl ₄ (corresponding to SiO _2.0 ) Were mixed at a molar ratio of each structural unit shown in Table 1, then hydrolyzed with water, and the generated hydrochloric acid was removed with methanol. Then, condensation of potassium hydroxide as a _{catalyst, R 3 SiO 0.5, R 2} SiO 1.0, RSiO 1.5, the proportion of structural units of _{SiO 2.0} was to produce a different silicone compound.

<Adjustment of the ratio of phenyl group and methyl group>
Using raw materials obtained by substituting the above R moiety with a phenyl group and a methyl group, silicone compounds having different molar ratios of phenyl group and methyl group were prepared.

<Adjustment of silanol group content>
The reaction time for condensing the silicone compound was adjusted to obtain a silicone compound. The obtained silicone compound was measured by ²⁹ Si-NMR using CDCl ₃ as a solvent and TMS (tetramethylsilane) as a standard substance at a total number of 256 times. The area (integrated value) of peaks of SiO _2.0 , RSiO _1.5 , R ₂ SiO _1.0 , R ₃ SiO _0.5 derived from a structure not containing a silanol group and Si derived from a structure containing a silanol group ( OH) ₄ , SiO _0.5 (OH) ₃ , SiO _1.0 (OH) ₂ , SiO _1.5 (OH), RSi (OH) ₃ , RSiO _0.5 (OH) ₂ , RSiO _1.0 ( The silanol group amount (wt%) was calculated from the ratio of the peak areas (integrated values) of OH), R ₂ Si (OH) ₂ , R ₂ SiO _0.5 (OH), and R ₃ Si (OH).

<Measurement of weight average molecular weight>
Each of the reaction times for condensing the silicone compound was adjusted, and the obtained silicone compound was measured with a gel permeation chromatography (GPC) using chloroform as a separation solution, a sample concentration of 1 wt%, and a detector RI. The weight average molecular weight was calculated in terms of polystyrene.

  Moreover, about the combustion evaluation in each Example, it performed as follows.

<Combustion evaluation method>
When 8.9 cm x 25.4 cm test pieces are taken from the fabric and 3 in the transverse direction, and evaluated according to the flameproof test specified in the vertical methane burner method of the flameproof product performance test standard The carbonization length, whether or not the gauze was ignited, and the number of drips were evaluated. Note that the shorter the carbonization length and the less ignition of the gauze, the higher the flame retardancy, and the smaller the number of drips, the higher the drip suppression effect.

<Dry cleaning process>
Processing was performed as follows with reference to JIS L 0860 (1996).

  Take a 4cm x 10cm fiber fabric sample, put 100ml of the dry cleaning solution and 20 stainless steel balls with a diameter of 6.4mm in the test bottle attached to the round meter type laundry tester, preheat it to about 40 ° C, and then put it into the tester. Rotate for 30 minutes at 40 ± 2 ° C. After completion of the rotation, after washing with 100 ml of room temperature perchlorethylene, it is sandwiched between dry filter papers and lightly pressed to remove the liquid, and then dried in a dryer at 60 ° C. or lower or in a room.

Examples 1-5
Polyether imide (product name ULTEM (product name) manufactured by GE Plastics Co., Ltd.) having a glass transition temperature (Tg) of 210 ° C. as a compound containing an imide structure is used as the polyester fiber, and polyethylene terephthalate having an intrinsic viscosity (IV) of 0.65 Registered trademark) 1010). Using the silicone compounds 1 to 5 shown in Table 1, the blending ratio is 75 wt% (polyethylene terephthalate): 20 wt% (polyetherimide): 5 wt% (silicone compound), polyethylene terephthalate, polyetherimide and silicone system. The compound was kneaded using a twin screw extruder under the conditions of kneading temperature: 290 ° C., L / D: 30, screw rotation speed: 300 rpm, and the strand was cut into 3 mm square chips to obtain chips.

  Thereafter, the obtained chip was dried at 150 ° C. for 12 hours and 2 Torr in a vacuum dryer, and then the spinning temperature was 295 ° C., the spinning speed was 3000 m / min, the nozzle diameter was 0.35 mm-24H (hole), and the discharge amount was 57 g / min. Spinning was performed under the following conditions to obtain a UY yarn having a composition ratio of 75 wt% (polyethylene terephthalate): 20 wt% (polyetherimide): 5 wt% (silicone compound). Subsequently, the UY yarn was drawn at a draw ratio such that the fineness of the drawn yarn obtained under the conditions of a drawing temperature of 90 ° C., a set temperature of 130 ° C., and a processing speed of 400 m / min was 110 dtex-24 filaments to obtain a drawn yarn. .

  Then, using the obtained drawn yarn, weaving using an air jet loom under the conditions of weaving structure: plain weave, warp density 99 / inch and weft density 90 / inch, followed by scouring and intermediate setting, and a combustion test The fiber fabric used for was obtained.

  As a result of evaluating the carbonization length, the presence or absence of ignition to the gauze, and the number of drips according to the above-described combustion evaluation method using the obtained fabrics, Examples 1 to 5 all had a maximum carbonization length of less than 254 mm and an average of 178 mm or less. There was no ignition to the gauze and the flame retardancy was high. Further, the number of drip times was 0, and the result of excellent drip suppression effect was obtained.

  Moreover, as a result of evaluating the number of times of flame contact and drip of the fiber fabric sample obtained by the dry cleaning treatment again according to the combustion evaluation method, as shown in Table 3, Examples 1 to 5 have the same performance as that before the dry cleaning. It was expressed and the result was excellent in dry cleaning durability.

Comparative Example 1
A fiber fabric comprising 100 wt% of polyethylene terephthalate with a blending ratio of 100 wt% (polyethylene terephthalate) was produced in the same manner as in Examples 1-5. In addition, since the imide structure containing compound and the silicone compound were not included, kneading was not performed.

  As a result of evaluating the number of flame contact and the number of drip according to the combustion evaluation method described above using the obtained fabric, Comparative Example 1 has a maximum carbonization length of 254 mm or more, an average of 179 mm or more, and there is ignition to gauze. The number of drip times was 10 times or more, and both the flame retardancy and the drip suppression effect were low.

Comparative Example 2
A fiber fabric was produced in the same manner as in Examples 1 to 5 except that the blending ratio was 95 wt% (polyethylene terephthalate): 5 wt% (silicone compound 1 shown in Table 1).

  As a result of evaluating the number of flame contact and the number of drip according to the above-described combustion evaluation method using the obtained fabric, Comparative Example 2 has a maximum of 254 mm or more, an average of 179 mm or more, no ignition to the gauze, It was 3 times, and compared with Examples 1-5, the flame retardance and the effect of drip suppression were low.

Comparative Example 3
A fiber fabric was produced in the same manner as in Examples 1 to 5, except that the blending ratio was 80 wt% (polyethylene terephthalate): 20 wt% (the same polyetherimide as in Examples 1 to 5).

  As a result of evaluating the number of flame contact and the number of drip according to the above-described combustion evaluation method using the obtained fabric, Comparative Example 3 has a maximum carbonization length of 254 mm or more, an average of 179 mm or more, and there is ignition to gauze. The number of drip times was 10 times or more, and both the flame retardancy and the drip suppression effect were low.

Comparative Example 4
A fiber fabric was produced in the same manner as in Examples 1 to 5 except that the silicone compound 6 shown in Table 1 was used as the silicone compound.

  As a result of evaluating the number of flame contact and the number of drip according to the above-described combustion evaluation method using the obtained fabric, Comparative Example 4 has a maximum carbonization length of 254 mm or more, an average of 179 mm or more, and there is ignition to gauze. The number of drip operations was 5, and both the flame retardancy and the drip suppression effect were low.

Claims (4)

A garment fiber product containing a polyester fiber, which contains a silicone compound having a constitutional unit represented by RSiO _1.5 (R is an organic group) and a compound having an imide structure in the polyester fiber, A flame-retardant clothing fiber product characterized by the absence of drip (melting dripping) in the flame-proof test specified in the vertical methane burner method of the flame-proof product performance test standard established by the Flame Association.   2. The organic group R constituting the silicone compound contains a phenyl group, and the content of the phenyl group is 30 mol% or more in a molar ratio with respect to all organic groups constituting the silicone compound. Flame retardant clothing textiles as described in 1.   The flame-retardant clothing fiber product according to claim 1 or 2, wherein the silanol group content contained in the silicone compound is 2% or more and 10% or less by weight with respect to the silicone compound.   The flame-retardant clothing fiber product according to any one of claims 1 to 3, wherein the compound having an imide structure is a polyetherimide.