JP2002356610A - Polyester composition and fiber made thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polyester composition which has high moisture absorption and can be used in underwear and sportswear as the woven and knitted fabrics and as the comfortable material for a lining, and a fiber made thereof. SOLUTION: The polyester composition comprises silica particles, and the polyester fiber having excellent moisture absorption is made of the composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester composition containing a large amount of silica-based inorganic particles and a fiber comprising the same. More specifically, the present invention relates to a polyester composition containing a large amount of silica-based inorganic particles having hygroscopicity, and a polyester fiber excellent in weather resistance, heat resistance, mechanical properties, hygroscopicity and the like. The polyester fiber has high hygroscopicity and can be suitably used as a comfortable material such as underwear, sportswear, and lining as a woven or knitted fabric.

[0002]

2. Description of the Related Art Polyesters such as polyethylene terephthalate are widely used as fibers, films and other molded articles because of their excellent strength, thermal stability, chemical resistance and the like. However, because polyethylene terephthalate is inherently hydrophobic, it has very poor moisture absorption and desorption properties,
When used as a garment, it is not a preferable material in terms of wearing comfort, for example, it gives rise to "uncomfortable feeling" at high humidity and generates static electricity at low humidity in winter.
Also, when used as a resin or a film, it may be charged due to low hygroscopicity, which may cause a problem.

In order to solve this problem, there has been proposed a method of copolymerizing or adding a compound having a moisture absorbing property to polyester. For example, JP-A-48-8270 discloses a method of copolymerizing a diol having an oxyalkylene glycol in a side chain, and JP-A-2-26985 discloses a method of copolymerizing a dicarboxylic acid containing a metal sulfonic acid salt. Have been. However, such a method of copolymerizing the moisture absorbing component has a problem that strength and weather resistance are reduced.

[0004] In addition to the above-mentioned method of modifying polyester, a method of attaching a hygroscopic compound to polyester fibers has been proposed. For example, Japanese Patent Publication No. Sho 59-17224 discloses a method in which acrylic acid or methacrylic acid is graft-polymerized on polyester fiber, and the carboxyl group thereof is replaced with an alkali metal to improve the hygroscopicity. However, since the hygroscopic compound adheres to the fiber surface, there is a problem that slimming occurs, strength decreases over time, and light resistance decreases.

Further, in order to solve the above-mentioned problem, in fiber applications, a core-sheath type conjugate fiber in which a hygroscopic resin having high hygroscopicity is used as a core and covered with a polyester sheath is disclosed in JP-A-2-99612. JP, JP-A-4-361616, JP-A-4-341617, JP-A-9-13
No. 2871 has been proposed. However, in the case of these core-sheath type composite fibers, the hygroscopic resin in the core swells due to the water content during hot water treatment such as scouring or dyeing, so that the fiber surface cracks (sheath crack) and the hygroscopic resin flows out of the fiber. However, there is a problem that the dyeing fastness is not sufficient and the quality of the fabric is deteriorated, and it cannot be said that the technology for imparting moisture absorption to the polyester fiber is at a sufficiently satisfactory level.

[0006] Japanese Patent Application Laid-Open No. 12-204230 discloses a method in which porous inorganic particles having a specific average particle diameter and a specific pore volume are contained in polyester.
Certainly, this method can solve the above problem and give the polyester a certain degree of hygroscopicity, but it is still insufficient from the viewpoint of hygroscopicity. As a result of intensive studies conducted by the present inventors to further improve the hygroscopicity, by incorporating silica-based inorganic particles in a specific range having a relationship between the pore volume and the specific surface area into the polyester, sufficient hygroscopicity is obtained. It has been found that it can be provided.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a polyester composition and fiber having excellent hygroscopicity while maintaining excellent properties of polyester. Is to provide.

[0008]

Means for Solving the Problems The above-mentioned problems are as follows:
Containing 1 to 20% of silica-based inorganic particles satisfying
The problem can be solved by a polyester composition characterized in that the particles are treated with 100 to 2000 ppm of a metal compound.

A. Pore volume V of silica-based inorganic particles (ml
/ G) is 0.4 or more, and the specific surface area S of the particles is
(M ² / g) must satisfy the following expression.

100 ≦ S / V <1500 The average particle size d (μm) is 0.01 to 10.

C. The moisture absorption parameter (ΔMR) is 7% or more.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The polyester of the present invention is preferably composed of a dicarboxylic acid component and a glycol component. For example, an esterification or transesterification reaction of a dicarboxylic acid or an ester-forming derivative thereof with a glycol, and a subsequent reaction. It is produced by a polycondensation reaction. The type of polyester is not particularly limited as long as it can be formed into a molded product such as fiber. Suitable polyesters that can be molded into molded articles such as fibers include those composed of aromatic dicarboxylic acid as the dicarboxylic acid component and aliphatic glycol or alicyclic glycol as the glycol component, such as polyethylene terephthalate and polyglycol. -1,3-propylene terephthalate, polyethylene-2,6-naphthalenedicarboxylate, polybutylene terephthalate, polycyclohexane dimethylene terephthalate, etc. Among them, polyethylene terephthalate and poly- 1,3-propylene terephthalate is preferred.

Of course, these polyesters may be homopolyesters or copolyesters. In this case, the copolymerization components include aromatic dicarboxylic acids other than the above-mentioned acid components and glycol components constituting the polyesters. Examples include acid components such as aliphatic dicarboxylic acids and alicyclic dicarboxylic acids, and glycol components such as aromatic glycols, aliphatic glycols and alicyclic glycols. For example, terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, phthalic acid, diphenyl dicarboxylic acid, diphenyl ether dicarboxylic acid, diphenoxyethane dicarboxylic acid, aromatic dicarboxylic acids such as 5-sodium sulfoisophthalic acid, oxalic acid, succinic acid, adipic acid And aliphatic dicarboxylic acids such as sebacic acid, dimer acid, maleic acid and fumaric acid, and alicyclic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid and decalin dicarboxylic acid. The glycol component includes fats such as ethylene glycol, 1,3-propylene glycol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol, and 1,10-decanediol. Triglycol,
Examples thereof include alicyclic glycols such as 1,2-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, and hydrogenated bisphenol A. The above-mentioned acid component and glycol component may be used alone or in combination of two or more. Also, these copolymer components are
It may be a by-product when producing polyester. Further, the amount of the components in the case of copolymerization is not particularly limited, but is preferably 30 mol% or less from the viewpoint of the strength and heat resistance of the obtained fiber.

[0014] The polyester of the present invention contains silica-based inorganic particles.

The silica-based inorganic particles used in the present invention are inorganic particles in which at least 50% of the particles are composed of SiO ₂ .
Specific examples include white carbon, silica sol, silica gel, silica-alumina composite particles obtained by a dry method, a wet method, and the like. Among them, silica-based inorganic particles obtained by a wet method are preferred from the viewpoint of the moisture absorption of fibers obtained from the polyester composition of the present invention. Especially Si
Silica particles obtained by a wet method having an O ₂ content of 95% or more are preferred.

The average particle size of the silica-based inorganic particles of the present invention is 0.01 to 0.01 from the viewpoints of the particle dispersibility in the polyester, the increase in the molecular weight of the obtained polyester, and the stability of the process when forming into fibers. It is 10 μm, preferably 0.1-5 μm, more preferably 0.2-2 μm. If the average particle size is less than 0.01 μm, the particles are poor in dispersibility, or in the polycondensation reaction stage of the polyester production process, the particles are aggregated by the surface activity of the particles, or the melt viscosity of the polymer is rapidly increased. , A high molecular weight polymer cannot be obtained. On the other hand, when the average particle size exceeds 10 μm,
A sudden increase in filter pressure may occur during melt molding,
Thread breakage occurs when forming into fibers.

Further, the silica-based inorganic particles of the present invention have a pore volume V of 0.
It is preferable that the relation between the pore volume is 4 ml / g or more and the pore volume V (ml / g) and the specific surface area S (m ² / g) satisfy the following expression.

100 ≦ S / V ≦ 1500 (m ² / ml) More preferably, the pore volume of the silica-based inorganic particles is 0.7 ml.
/ G or more, more preferably 1.0 ml / g or more. If the pore volume is out of this range, the silica-based inorganic particles may have poor hygroscopicity, and the resulting fiber may have poor hygroscopicity. Further, a more preferable relationship between the pore volume V and the specific surface area S is 200 ≦ S / V ≦ 1000, and further preferably 300 ≦ S / V ≦ 800. If the relationship between the pore volume of the particles and the specific surface area is out of this range, the particles may be poor in hygroscopicity, and the fiber obtained from the polyester composition containing the particles may be poor in hygroscopicity.

Furthermore, the silica-based inorganic particles used in the present invention is preferably from the viewpoint of hygroscopicity two / nm ² or more silanol groups present on the particle surfaces. If the number of silanol groups on the surface is less than this, satisfactory hygroscopicity may be poor.

The hygroscopic parameter (hereinafter referred to as ΔMR) showing the hygroscopic property of the silica-based inorganic particles is preferably as high as possible to increase the hygroscopicity of the synthetic fiber using the same, but is preferably at least 7%. It is necessary. It is preferably at least 20%, particularly preferably at least 30%.

Here, ΔMR is the difference between the moisture absorption rate (MR2) at 30 ° C. × 90% RH and the moisture absorption rate (MR1) at 20 ° C. × 65% RH (ΔMR (%) = MR2−
MR1). ΔMR is a driving force for obtaining comfort by releasing moisture in clothes to the outside air when the clothes are worn, and 30 ° C. × 90% RH when light to medium work or light to medium exercise is performed. Temperature in clothes represented by 20
It is a difference in moisture absorption from the outside temperature and humidity represented by ° C × 65% RH. In the present invention, ΔMR is used as a parameter as a scale for evaluating hygroscopicity. The larger the ΔMR, the higher the moisture absorption / desorption ability and the better the comfort when worn.

If the moisture absorption of the silica-based inorganic particles is less than 7%, the resulting fiber may have poor moisture absorption / desorption properties.

In order to obtain practical wearing comfort, the ΔMR of the synthetic fiber is preferably as high as possible within a range that does not cause a change with time, more preferably 1.0% or more, more preferably 2.0% or more. Particularly preferably, it is at least 2.5%.

The content of the silica-based inorganic particles of the present invention in the polyester is from 1 to 20% by weight from the viewpoint of increasing the molecular weight of the obtained polyester, dispersing the particles in the polyester, and absorbing and desorbing the fibers, and the strength. %. Preferably 2
It is 17% by weight, more preferably 3 to 15% by weight, still more preferably 5 to 15% by weight. When the content is less than 1% by weight, the obtained fiber is inferior in moisture absorption / release properties. Meanwhile, 2
If the content exceeds 0% by weight, the melt viscosity of the particle-containing polyester composition becomes extremely high, so that high molecular weight polyester cannot be obtained and mechanical properties such as fiber strength are inferior.

The silica-based inorganic particles contained in the polyester composition of the present invention have a large specific surface area and a very high surface activity. Therefore, from the viewpoint of increasing the molecular weight of the polyester or reducing the melt viscosity of the polyester composition, It must be treated with a metal compound. By treating with a metal compound, it is possible to suppress agglomeration of particles caused by the surface activity of the particles and a sharp rise in the melt viscosity of the polymer at the stage of the polycondensation reaction in the polyester production process, and have excellent particle dispersibility and high molecular weight. Is obtained. In addition, a sharp increase in filter pressure during melt molding is suppressed, and yarn breakage is small when molding into fibers.

The amount of the metal compound applied to the silica-based inorganic particles of the present invention is 100 to 2000 ppm. Silica-based inorganic particles treated with various metal compounds were measured with a fluorescent X-ray analyzer (FLX) manufactured by Rigaku Corporation.
If the treated amount is less than 100 ppm, the surface active groups of the silica-based inorganic particles are not sufficiently blocked, so that aggregation of the particles and a sharp increase in melt viscosity cannot be suppressed.
On the other hand, if the treated amount exceeds 2,000 ppm, there is a problem that when added to the polyester, the physical properties of the polyester are impaired by an excessive amount of the metal compound. The amount treated with the metal compound is preferably from 200 to
1000 ppm, more preferably 300-800 ppm
It is.

The metal compound treated on the silica-based inorganic particles may be any compound that reduces the interaction between silica and polyester, or silica, but a transition metal compound is particularly preferred. The term “transition metal” as used herein refers to a Group 3-10 element in the long period type periodic table from the fourth period onward, and includes lanthanoids and actinoids.

Among the transition metals, a transition metal compound in the fourth period of the periodic table is more preferable. Examples of transition metals in the fourth period of the periodic table include Sc to Zn having an atomic number of 21.

The more preferred transition metal in the fourth cycle is M
n, Fe, Co, Ni, Cu, and Zn; and particularly preferred are Mn, Fe, and Co.

The oxidation number of the above-mentioned metal may be any number as long as the metal can be employed, but preferably has a valence of 2 to 3, and most preferably 2 from the viewpoint of economy.

Further, as a salt forming a metal compound,
Examples thereof include sulfates, nitrates, carbonates, acetates, and oxides of the above metals, and carbonates and acetates are particularly preferred.

The method of treating the silica-based inorganic particles with the metal compound may be simply mixing the silica-based inorganic particles with the slurry of the silica-based inorganic particles, a method of heating after mixing, a method of performing a chemical reaction in a solvent, or a method of treating the silica-based inorganic particles. The metal compound may be added to the polyester in which the inorganic particles are added and mixed, and then the silica-based inorganic particles may be added and treated in the polymer. Is preferred.

The method of incorporating the silica-based inorganic particles into the polyester of the present invention includes, for example, (1) directly mixing the silica-based inorganic particles and the polyester with a blender, a mixer, or the like; Melt kneading using a screw extruder, (2) silica-based inorganic particles and polyester are mixed directly or beforehand in a blender, mixer, or the like, and then mixed with a normal vent-type single screw;
Examples thereof include a method of melt-kneading using a twin-screw extruder, and a method of adding (3) silica-based inorganic particles in a polyester production reaction step. Above all, it is preferable to incorporate the silica-based inorganic particles by the method (2) or (3) from the viewpoint of the particle dispersibility of the silica-based inorganic particles and the quality stability of the obtained fiber.

In producing the polyester of the present invention,
Conventionally known reaction catalysts can be used. For example,
As an esterification or transesterification reaction catalyst, an alkali metal, an alkaline earth metal, zinc, manganese, a metal compound such as cobalt, and as a polycondensation reaction catalyst, titanium,
A germanium compound or the like can be used.

The polyester composition of the present invention and the fiber comprising the same may be used as pigments such as titanium oxide and carbon black, surfactants such as alkylbenzene sulfonate, and conventionally known antioxidant as long as the object of the present invention is not impaired. , An anti-coloring agent, a light-fast agent, an antistatic agent, and the like.

The fiber comprising the polyester composition of the present invention can be produced by a conventionally known method. For example, 5
A method of melt-spinning at a speed of 00 to 2500 m / min, followed by drawing and heat treatment, and a method of melt-spinning at a speed of 1500 to 5000 m / min and performing drawing and false twisting simultaneously or after drawing A method of melt-spinning at a high speed of 3000 m / min or more and omitting a stretching step depending on the application;
Arbitrary yarn production conditions can be adopted.

The cross-sectional shape of the polyester fiber of the present invention is not limited to a circle, but may be a triangular, flat, multi-lobed, polygonal, H-shaped, or Π-shaped cross section. The thread form of the fiber may be either filament or staple, and is appropriately selected depending on the application.

The polyester fiber of the present invention can be used in the form of a fabric, such as a woven fabric, a knitted fabric, or a nonwoven fabric, depending on its use.

The fiber of the present invention obtained by the above method has a ΔMR of 1.0 to obtain practical wearing comfort.
% Or more, more preferably 1.5% or more, and still more preferably 2.0% or more.

The polyester fiber of the present invention can be reduced by various methods. For example, plasma processing,
Laser treatment, alkali weight reduction treatment and the like can be given. From the viewpoint of the texture of the obtained fiber and dyeability, the alkali weight reduction method is preferred as the weight reduction method. Examples of the alkali used at this time include compounds such as NaOH, KOH, and LiOH. The treatment for reducing the weight of polyester fiber and the like is performed with the aqueous solution of alkali, and the alkali concentration is 0.5
In this case, the alkali weight loss rate is not particularly limited, but the weight loss rate is preferably 50% or less, more preferably 30% or less, in view of the strength of the fiber to be obtained, the texture, and the like. Preferably it is 20% or less.

[0041]

The present invention will be described in more detail with reference to the following examples. In addition, each characteristic value in an Example was calculated | required by the following method.

A. Intrinsic viscosity of the polyester [η] An orthochlorophenol solution was determined at 25 ° C.

B. Moisture Absorption Parameter (ΔMR) of Particles and Fibers Containing It Particles are 1 g of particles in the case of particles, and 1 to 3 g of original yarn or fabric in the case of fibers.
From the weight change with the weight after standing in a thermo-hygrostat (PR-2G made by Tabai) for 24 hours in an atmosphere of 0 ° C. × 65% RH or 30 ° C. × 90% RH, it was determined by the following equation. Moisture absorption (%) = (weight after moisture absorption−weight at absolute drying) / weight at absolute drying × 100 20 ° C. × 65% RH and 30 ° C. × 90% measured above.
From the moisture absorption rate under the condition of RH (referred to as MR1 and MR2, respectively), a moisture absorption rate difference ΔMR (%) = MR2-MR1 was obtained.

C. The average particle size of the particles and the content of the coarse particles are HORIBA
The measurement was performed with a particle size analyzer (LA-700).

D. The specific surface area and pore volume of the particles were measured at a temperature of 77 K by the nitrogen adsorption method, the specific surface area was analyzed by the BET method, and the pore volume was analyzed by the DH method.

E. Determination of Silanol Groups on Surface Fine powder silica was dried at a pressure of 0.1 kPa or less at a temperature of 120 ° C., and then reacted with lithium aluminum hydride in dioxane to measure the amount of hydrogen.

F. Measurement of Amount of Metal Compound Silica-based inorganic particles treated with various metal compounds were measured with a fluorescent X-ray analyzer (FLX) manufactured by Rigaku Corporation.

G. Strength and elongation Using a Tensilon tensile tester manufactured by Toyo Baldwin Co., values were obtained from a stress-strain curve under the conditions of a test length of 20 cm and a tensile speed of 10 cm / min.

Example 1 Average particle size 0.5 μm, pore volume 1.2 ml / g, S / V
Was 500, the hygroscopic parameter (ΔMR) of the wet silica particles was 32.4%. The silica particles 8
Manganese acetate 0.0
Five parts were added, and heat treatment was performed at 100 ° C. A small amount of the treated particles was taken out and the amount of the metal compound was measured by FLX.
It was 0 ppm.

As a polyester, 194 parts of dimethyl terephthalic acid, 124 parts of ethylene glycol and 0.05 part of magnesium acetate were added, and a transesterification reaction was carried out at 140 to 230 ° C. while distilling off methanol to obtain 0.08 part of trimethyl phosphate. An ethylene glycol solution was added.
Further, the silica particle slurry after the treatment and 0.1 part of antimony trioxide are added, and the mixture is heated at 290 ° C. under reduced pressure of 0.1 kPa.
The polymerization was carried out under the condition where the temperature was raised to obtain a polyester chip. The content of silica particles in this polyester chip was 8.0% by weight, and the ΔMR was 2.6%.

This chip was melted at 290 ° C.
It was discharged from a concentric die at a rate of 5 g / min, and was wound at an spinning speed of 1000 m / min to obtain an undrawn yarn. This undrawn yarn is drawn at a temperature of 90 ° C., a heat setting temperature of 130 ° C. and a drawing speed of 800 m.
The stretched yarn was stretched 3.0 times at / min to obtain a drawn yarn of 107 tex-24f. Fiber properties: 3.5 cN / dtex, elongation 4
0.3%. The drawn yarn was knitted in a tube and the moisture absorption and desorption of the knitted fabric was measured. As a result, it was found that ΔMR was 2.6%, indicating good moisture absorption and desorption characteristics.

Examples 2 and 3 Comparative Examples 1 and 2 Polyester and fibers were obtained in the same manner as in Example 1 except that the average particle size of the particles was changed. In Comparative Example 1, aggregation was caused because the particle size was too small, resulting in poor dispersibility. In Comparative Example 2, yarn breakage occurred frequently because the particle size was too large, and fibers could not be obtained.

Examples 4 and 5 Comparative Example 3 Polyester and fibers were obtained in the same manner as in Example 1 except that the pore volume of the particles was changed. In Comparative Example 3, satisfactory moisture absorption could not be provided due to small pore volume.

Examples 6 and 7 Comparative Examples 4 and 5 Polyesters and fibers were obtained in the same manner as in Example 1 except that S / V was changed. In Comparative Examples 4 and 5, S /
Since V was outside the range of the claims, satisfactory hygroscopicity could not be provided.

Examples 8 and 9 Comparative Examples 6 and 7 Polyesters and fibers were obtained in the same manner as in Example 1 except that the amount of silica particles was changed. In Comparative Example 6, the amount of the silica particles added was too small, so that satisfactory hygroscopicity could not be provided. In Comparative Example 7, yarn breakage occurred frequently because the amount of addition was too large, and fibers could not be obtained.

Examples 10 and 11 Comparative Examples 8 and 9 Polyesters and fibers were obtained in the same manner as in Example 1 except that the amount of the metal compound treated on the silica particles was changed. In Comparative Example 8, the dispersibility was poor because the silica particles were not sufficiently treated with the metal compound. In Comparative Example 9, since the amount of the metal compound treated was too large, it became a foreign substance, causing frequent thread breakage, and a fiber could not be obtained.

Example 12 Polyester and fibers were obtained in the same manner as in Example 1, except that the metal compound treated on the silica-based inorganic particles was changed to cobalt acetate. When the moisture absorption of this fiber was measured, the ΔMR was 2.6%, indicating that the fiber exhibited good moisture absorption / desorption characteristics.

Example 13 Polyester and fibers were obtained in the same manner as in Example 1, except that the metal compound treated on the silica-based inorganic particles was changed to iron acetate. The hygroscopicity of this fiber was measured and found to be ΔM
R was 2.6%, indicating that good moisture absorption / release properties were exhibited.

Example 14 A polyester and a fiber were obtained in the same manner as in Example 1, except that the metal compound treated on the silica-based inorganic particles was changed to nickel acetate. When the hygroscopicity of this fiber was measured, the ΔMR was 2.6%, and it was found that the fiber exhibited good hygroscopicity.

Example 15 Polyester and fibers were obtained in the same manner as in Example 1, except that the metal compound treated on the silica-based inorganic particles was changed to zinc acetate. When the moisture absorption of this fiber was measured, Δ
The MR was 2.6%, and it was found that the film showed good moisture absorption / release properties.

[0061]

[Table 1]

[0062]

[Table 2]

[0063]

[Table 3]

[0064]

EFFECTS OF THE INVENTION The polyester composition of the present invention makes it possible to stably produce fibers having sufficient hygroscopicity in terms of wearing comfort and the like, and having a dry touch feeling and high color fastness and light fastness. . The synthetic fibers obtained from the present invention are suitable for underwear, shirts, blouses, middle garments, sportswear, slacks, outer garments, linings, curtains, wallpapers, and even sheets, futon covers, and stuffed cotton. It is extremely practical.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4J002 CF031 CF041 CF051 CF061 CF071 CF081 DJ016 FA086 FB076 FD090 FD310 GK01 4L035 AA05 BB31 EE05 KK03 KK05 KK09

Claims (5)

[Claims] (1) A silica-based inorganic particle satisfying the following A to C is contained in an amount of 1 to 20%, the particle is treated with a metal compound of 100 to 2000 ppm, and a moisture absorption parameter (ΔM
R) is at least 1%. A. The pore volume V (ml / g) of the silica-based inorganic particles is 0.
4 or more, and the relationship with the specific surface area S (m ² / g) of the particles satisfies the following expression. 100 ≦ S / V <1500 B. The average particle size d (μm) is 0.01 to 10. C. The moisture absorption parameter (ΔMR) is 7% or more. 2. The polyester composition according to claim 1, wherein the metal compound treated with the silica-based inorganic particles is a transition metal compound. 3. The polyester composition according to claim 1, wherein the metal compound treated with the silica-based inorganic particles is a transition metal compound of the fourth period of the periodic table. 4. The method according to claim 1, wherein the metal in the metal compound treated with the silica-based inorganic particles is at least one selected from Mn, Co, and Fe.
The polyester composition according to claim 1, wherein: 5. A fiber comprising the polyester composition according to claim 1.