JPS61207620A - Polyester yarn - Google Patents

Abstract

PURPOSE:The titled yarn having improved color tone, mechanical characteristics, wear resistance and fur-like feeling with durability, having a core-sheath structure wherein the sheath has fine particles with specific particle diameter and a specific higher aliphatic monocarboxylic acid ester. CONSTITUTION:The aimed yarn of core-sheath type yarn comprising a polyester having ethylene terephthalate as a main repeating unit, wherein the sheath contains (A) 0.005-2pts.wt. fine particles having 0.05-3mu average particle diameter, and (B)=1pt.wt.-=(60-R)/2pts.wt. [R is ratio of crosssectional area of sheath to that of filament (%)] 34-65C higher aliphatic monocarboxylic acid ester (preferably cetyl montanate, etc.) based on 100pts.wt. polyester, and R is made into 1-30%.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to polyester fibers having good color tone, sliminess and abrasion resistance. More specifically, it contains a specific amount of fine particles of a specific size and a specific amount of a specific higher aliphatic monocarboxylic acid ester compound, and has good color tone and abrasion resistance.

It relates to polyester fibers that have a durable and slimy feel.

[Prior art and its problems]

In recent years, various modifications have been made to polyester fibers in order to give them an appearance and feel similar to natural fibers. Among these, many studies have been made on polyester fibers that have an appearance and texture similar to high-quality animal hair. In order to obtain polyester fibers with a texture similar to animal hair, it is necessary to give the polyester fibers the sliminess characteristic of animal hair. There are methods of incorporating ethylene etc. into polyester, wax, fluorine compounds, etc. after fiber formation.
Methods of attaching slippery organic compounds such as silicone compounds to polyester fibers have been studied.

However, if a slippery polymer such as polyorganosiloxane or polytetrafluoroethylene is included, it is possible to impart a slimy feel to polyester fibers, but these slippery polymers have poor compatibility with polyester. Therefore, it is necessary to add a large amount of K to give a sufficient slimy feel, and as a result, the polyester is significantly colored, and only fibers with low tenacity change can be obtained, making it impossible to obtain a satisfactory animal hair-like polyester fiber. There wasn't.

On the other hand, if a slippery organic compound such as wax, fluorine compound, or silicone compound is attached to polyester fiber after fiber formation, it can give a slimy feel, but it will fall off during washing, dry cleaning, etc., and the durability will be reduced. There was a disadvantage that it was inferior.

[Purpose of the invention]

The object of the present invention is to provide polyester fibers that have good color tone, mechanical properties and abrasion resistance, and have a durable slimy feel.

[Structure of the invention]

The object of the present invention is to provide a polyester fiber essentially having a core-sheath structure, in which 0.00% of fine particles with an average particle size of 0.05 to 3 μm are added to 100 parts by weight of polyester whose main repeating unit is ethylene terephthalate in the sheath. 005-2.
0 parts by weight and a compound consisting of a higher aliphatic monocarboxylic acid ester having 34 to 65 carbon atoms as a main component by weight part P represented by the following formula, and the ratio of the cross-sectional area of the sheath to the cross-sectional area of the fiber is 1. This can be achieved by polyester fibers characterized in that the ratio is 30% or less.

The polyester fiber having a core-sheath structure as referred to in the present invention means that the effect of the present invention is sufficiently exhibited if the sheath component accounts for at least 80% of the entire circumference of the fiber cross section perpendicular to the fiber axis direction, and preferably The entire circumference is formed by a sheath part.

The polyester in the present invention may be a homopolyester or a copolyester as long as it is a polyester mainly composed of polyethylene terephthalate. Components to be copolymerized include, for example, diethylene glycol, propylene glycol, neopentyl glycol, polyalkylene glycol, 1,4-cyclohexane dimetatool, 1.
Diol components such as 4-butanediol and tetodiethylene glycol, dicarboxylic acids such as adipic acid, sepacic acid, phthalic acid, isophthalic acid, 2,6-naphthalene dicarboxylic acid, 5-sulph, thorium sulfoisophthalic acid, dodecanedioic acid, and dimer acid. Examples include acid components, polyfunctional dicarboxylic acid components such as trimellitic acid and pyromellitic acid, and oxycarboxylic acid components such as p-oxyethoxybenzoic acid.

In the present invention, the fine particles refer to at least one type of inert particles selected from internal particles and inorganic particles and organic particles insoluble in polyester containing polyethylene terephthalate as a main component.

The internal particles here refer to those separated by the particle separation method described later, but internal particles include metal compounds (e.g. calcium compounds, magnesium compounds, manganese compounds) added during the synthesis of polyester whose main component is polyethylene terephthalate. and at least one kind of compound such as a lithium compound), a phosphorus compound, etc., and a component constituting polyethylene terephthalate are combined to form particles. More specific examples of metal compounds to be added include galcium acetate, magnesium acetate, manganese acetate, lithium acetate, lithium carbonate, etc. Phosphorus compounds to be added include phosphoric acid, phosphonic acid, And one or more of these esters and partial esters are used.

On the other hand, inert particles include calcium carbonate, wet silicon oxide% dry silicon oxide, aluminum silicate, barium sulfate, calcium phosphate, talc, titanium dioxide, aluminum oxide, aluminum hydroxide, calcium terephthalate, mu, calcium silicate, etc. Examples include fluorine-based fine particle polymers and crosslinked polymer fine powders.

These inert particles can be processed by various methods commonly used for coarse particle removal and particle size control, such as air and classification, natural sedimentation as ethylene glycol slurry or water slurry, and grinding and/or classification treatments such as sand mill grinding. It is preferable to use one that has been subjected to the following steps.

The average particle diameter of the fine particles contained in the sheath of the polyester fiber of the present invention must be 0.05 to 3μ, and 0.1 to 3μ.
2μ is more preferable.

If the average particle size is less than 0.05 μm, the thread-based friction coefficient becomes large and the resulting fibers lack sliminess.

On the other hand, if the average particle size exceeds 3μ, the abrasion resistance of the resulting fibers will be poor.

The content of fine particles with an average particle size of 0.05 to 3/J in the present invention must be 0.005 to 2.0 parts by weight, preferably 0.005 to 1.0 parts by weight, 0.0
More preferably 1 to 0.5 parts by weight. Particle content 0.00
If the amount is less than 5 parts by weight, the yarn-based friction coefficient of the resulting fibers will increase, resulting in insufficient sliminess.

On the other hand, if the particle content exceeds 2.0 parts by weight, large amounts of coarse particles will be generated, resulting in poor abrasion resistance of the resulting fibers.

The main component contained in the polyester fiber sheath of the present invention is a higher aliphatic monocarboxylic acid ester having 34 to 65 carbon atoms. A compound containing as a main component an ester reaction product obtained by reaction with a higher aliphatic monocarboxylic acid is preferably used. Specific examples include hexyl montanate, ceryl montanate, octacosyl lignocerate, merisyl lignocerate, seryl lignocerate, merisyl cerotate, heptasul heptalotate, etc., as well as naturally-obtained mokutan wax and caruna. Uba wax, bees wax, candelilla wax, Nuka wax, Ipotal wax, etc. are also preferably used.

It is preferable that the acid value of the compound whose main component is a higher aliphatic monocarboxylic acid ester having 54 to 65 carbon atoms is 5 or less from the viewpoint of sliminess.

The higher aliphatic monocarboxylic acid ester compound in the present invention must have 34 to 65 carbon atoms, preferably 40 to 62 carbon atoms.

When the number of carbon atoms is 33 or less, the heat resistance of the higher aliphatic monocarboxylic acid ester compound is poor, resulting in severe discoloration of the resulting polyester fiber. On the other hand, those with 66 or more carbon atoms have poor compatibility with polyester, so
The effect of imparting sliminess is small.

The polyester fiber of the present invention contains both these fine particles and a compound consisting of these higher aliphatic monocarboxylic acid esters.

-II-jtl"-one + soheshi one insect ^μ111 first--re→-noreto≠-one-one-ko"L-again. Although the exact reason for this synergistic effect is unknown, the following two reasons are possible.

Conventionally, yarns were made by exposing fine particles on the fiber surface.
It was known that the polyester fiber of the present invention has both the fine particles and the compound exposed on the fiber surface, so microscopically, the thread-based friction coefficient is lowered by thread-based friction. The friction coefficient decreases due to frequent contact and abrasion between the fine particles exposed on the surface and the core compound, but the first main reason for the unexpectedly large effect of imparting sliminess is as follows. It is believed that K contacts the compound selectively to some extent so as to reduce the coefficient of friction between the fine particles and the fibers with which they come into contact during thread-based abrasion.

The second effect is that the compound suppresses agglomeration of the fine particles in the polyester and finely disperses the particles.

The higher aliphatic monocarboxylic acid ester compound having 34 to 65 carbon atoms in the present invention has a main repeating unit in the sheath of the polyester fiber of 1 to 4 ethylene esters and 1 nnt to 1 ester. 0 parts by weight or more (6
0-R) It is necessary to contain 72 parts by weight or less. However, R is the ratio of the cross-sectional area of the sheath to the fiber cross-sectional area perpendicular to the fiber axis direction, and the unit is ratio. Content is 1.0
If it is less than 1 part by weight, the effect of imparting sliminess will be small. Also (6
If the amount exceeds 0-R)/2 parts by weight, the fibers will become heavily colored and at the same time the mechanical properties of the fibers will deteriorate.

It is necessary that the fiber of the present invention has a substantially busy core-sheath structure, and the ratio of the cross-sectional area of the sheath to the total cross-sectional area of the fiber is 1 to 30, preferably 20 to less. If the cross-sectional area ratio of the sheath exceeds 30%, the cross-sectional area ratio of the core, which mainly maintains the mechanical properties of the composite polyester fiber, will be less than 70%, resulting in poor mechanical properties such as 5 strength, and the sheath will deteriorate. As the thickness increases, the coloring of the fibers also becomes more intense. Furthermore, if the cross-sectional area ratio of the sheath is less than 1%, the sheath portion will be worn out due to mechanical friction during the yarn weaving and knitting processes, and the core portion will be exposed, so that the desired effects of the present invention cannot be expected. This results in inferior physical properties and quality.

In addition, the polyester fiber of the present invention may contain stabilizers, heat resistant agents, weather resistant agents, antioxidants, etc. in the sheath and/or core as necessary.
Optional additives such as antistatic agents and flame retardants may be included.

The polyester fiber of the present invention can be obtained by polymerizing and spinning by a known method. Polymerization methods include, for example, a method in which the resulting prepolymer is polycondensed at high temperature and vacuum after an esterification reaction between a dicarboxylic acid and a glycol, or a transesterification reaction between a dicarboxylic acid ester and a glycol, or a method in which the prepolymer itself is used as a starting material. A method of polycondensation is used.

The timing of addition of the compound to generate internal particles is not particularly limited, but the metal may be added at any time from the time when the esterification reaction or transesterification reaction is substantially completed to the early stage when the polycondensation reaction has not progressed very much. It is preferable to add at least one of the compounds and the phosphorus compound to the reaction etc. in the form of a glycol solution.

The inert particles and the higher aliphatic monocarboxylic acid ester compound may be added before the polyester polymerization reaction, during the polymerization reaction, after the completion of the polymerization, during chip drying, or immediately before spinning, but in the case of inert particles, the Preferably, a slurry of active particles dispersed in water and/or ethylene glycol is added before or during the polymerization reaction.

In the present invention, there is a method in which a polyester containing fine particles is separately manufactured and kneaded with a higher aliphatic monocarboxylic acid ester compound in a melting process, or a polyester containing a large amount of particles and/or a higher aliphatic monocarboxylic acid ester compound is used. A method of diluting and mixing polyesters is also preferably employed.

In the present invention, even if the cross-sectional shape of the polyester fiber perpendicular to the fiber axis is circular, it may be irregularly shaped such as Y-shape, T-shape, pentagonal, octagonal, etc., or it may be flattened to obtain an appearance and texture similar to animal hair. Cross or square shape m-1% nine I positive? To l-! The tsurimochi-faced mackerel seam nose piece f can be manufactured by a known method in which a core-sheath type composite flow is formed and then discharged from an irregular cross-section discharge hole.

The spinning method is a normal melt spinning method at a spinning speed of 28
Spin at 0 to 300°C to obtain undrawn yarn, which is then preheated to the usual 70 to 200°C using bins, plates, rollers, etc.
2 to 6 by stretching method using plate or roller m-roller
A method of stretching to double is preferably adopted.

〔Effect of the invention〕

(1) A composite core-sheath type fiber containing a specific amount of fine particles with a specific particle size and a specific amount of a compound consisting of a specific higher aliphatic monocarboxylic acid ester, and with a specific sheath cross-sectional area ratio. Due to these synergistic effects, the polyester fiber of the present invention has extremely good color tone, abrasion resistance, and slimy feel, and also has excellent mechanical properties. Therefore, it is a fiber suitable for use as an animal hair-like polyester fiber.

(2) A compound consisting of a specific higher aliphatic monocarboxylic acid ester that produces a slimy feel and specific fine particles are contained not only in the surface layer of the polyester fiber but also inside the fiber as a sheath component, making it suitable for washing and dry cleaning. It has excellent durability and does not lose its slimy feel even after washing.

The present invention will be explained in detail with reference to Examples below.

In addition, the measurement method and treatment of each characteristic value of polyester and polyester fiber in Examples were performed by the following method.

(Particle separation method) Polyester fibers are dissolved in orthochlorophenol solvent and then centrifuged. After separation, the supernatant liquid is removed by a decanting method to obtain separated particles. There may be a mixture of polyester components in the separated particles due to insufficient separation, so in order to remove this component, ornochlorophenol at room temperature was added to the collected particles and after almost homogeneous suspension, ultracentrifugation was performed again. Repeat machine processing <b>. The separated particles obtained in this way were separated into 12
Vacuum dry at 0°C for 16 hours and weigh.

Note that the separated particles obtained by the above operation may contain both internal particles and inert particles.

Therefore, in order to separately determine the amount of internal particles and the amount of inert particles, the separated particles are depolymerized in ethylene glycol to dissolve only the internal particles. The remaining particles are centrifuged to obtain separated particles, which are dry weighed to determine the amount of inert particles. The difference between the initial separated particle amount and the inert particle amount is defined as the internal particle amount.

(Strength and elongation) The strength and elongation was determined using a Tensilon tensile tester manufactured by Toyo Baldwin Co., Ltd. under the conditions of a sample length of 20081 mm and a tensile speed of 100 g1/min.

(Intrinsic viscosity of polyester) This is the value measured at 25°C using an Ostwald viscometer after dissolving a dried sample in an orthochlorophenol solvent.

(Method for creating tubular knitted fabric) A tubular knitted fabric is knitted using filaments using a 27-gauge sock knitting machine.

(Scouring method) Tube knitted fabric was treated with 0.2% nonionic activator [Comput G-9
00 (manufactured by Sanyo Chemical Co., Ltd.)] and scouring by boiling in boiling water containing 0.2% soda ash for 5 minutes, followed by washing with water and drying.

(Color tone) The number of tube knitted fabrics after scouring that do not allow the irradiation light to pass through is stacked, and the color tone is measured using a digital measuring color difference calculator and expressed as a b value. The larger the b value, the more yellowish the color tone becomes.

(Sliminess) Ten panelists touched 1 g of the tube knitted fabric after scouring with their hands and conducted a sensory test. Those with a diameter of 5 Å or more found it to be slimy, and 2 to 4 panelists judged it as slimy. Those with a slimy feel were rated Δ, and the others were rated ×.

(Average particle size of particles) What is the average particle size? - the diameter of a sphere with the same volume as the volume of the particle as determined by optical or electron micrographs of the particles inside.

Figure 1 shows a schematic diagram of the abrasion tester. Sample (tube knitted fabric) 1
so that the friction area with friction cloth 2 is 12.5 ad,
It is attached to the head 3 using the holder 4, and the sum of the loads 5 on it is 750 gK. Attach this to the friction table 6 via anti-slip sandpaper 7, and
After performing eccentric rotation at rpm and friction for 10 minutes, sample 1 was removed and the degree of wear was visually determined.

That is, when abrasion occurs, the rubbed area looks whiter than the non-rubbed area, so we observed the white appearance of the rubbed area and judged it in the following three stages.

Class 3 near a nuting is not allowed.

Grade 2: Some frosty ink is observed.

Grade 1: Frosting is significantly observed.

Among the above, when used for ordinary fabric, it is grade 2'
The above is considered a passing level.

(Yarn-system friction coefficient) The filament yarn to be evaluated was made into a skein in advance and subjected to a scouring process under the same conditions as the above-mentioned scouring method, and tested to JISL10 using a radar set friction coefficient tester manufactured by Maeda Seiki Co., Ltd.
Measure the coefficient of static friction according to 74.

Example 1 A transesterification reaction was carried out using 100 parts by weight of dimethyl terephthalate, 62 parts by weight of ethylene glycol, and 0.06 parts by weight of calcium acetate as a catalyst, and the product was mixed with 0.04 parts by weight of antimony trioxide and lithium acetate. 40
．． After adding 0.07 parts by weight and 0.04 parts by weight of calcium acetate, and subsequently adding 0.02 parts by weight of phosphorous acid and 0.10 parts by weight of trimethyl phosphate, a polycondensation reaction was carried out to obtain an intrinsic viscosity (L61 .Internal particles (average particle size 1.0μ)
A polymer containing 0.55 parts by weight (based on 100 parts by weight of polyester) was obtained. Calcium element in the internal particles1.
2 parts by weight, 1.9 parts by weight of lithium element, 4.9 parts of phosphorus element
Contains parts by weight. (Polyester II-A) 100 parts by weight of terephthalic acid and 43 parts by weight of ethylene glycol were kneaded to prepare a slurry.

The slurry is continuously added at a constant rate to a reactant of 50 parts by weight of terephthalic acid and 21.5 parts by weight of ethylene glycol stored at 245°C in a reactor, and an esterification reaction is carried out at 245°C under normal pressure to produce the slurry. Water was continuously distilled out of the system from the rectification column. The slurry supply time is 5 hours 50
The esterification reaction was completed in 4 hours.

From the obtained reaction product, an esterification reaction product equivalent to 100 parts by weight of terephthalic acid was transferred to a polymerization apparatus, and 0.04 parts by weight of phosphoric acid was added.
5 parts by weight, 0.023 parts by weight of antimony dioxide, and 2.5 parts by weight of calcium carbonate having an average particle size of 1.5 microns. s parts by weight were added as an ethylene glycol slurry, and a polycondensation reaction was carried out by a conventional method. The resulting polymer had an intrinsic viscosity of 0.61, had no internal particles defined by the present invention, and contained 2 parts by weight of calcium carbonate. (Polyester: B) Polycondensation reaction was carried out in the same manner as Polyester 2B without adding inert particles to obtain a polymer having an intrinsic viscosity of 0.62. (Polyester 2C) Polyester: Polycondensation reaction was carried out in the same manner as B without adding inert particles, and after the reaction was completed, 30.0 parts by weight of carnauba wax was added to approx.
Mixing under reduced pressure was carried out for several minutes to obtain a polymer having an intrinsic viscosity of 0.51. (Polyester: D) Polyester A1 obtained by smelting, polyester B1, polyester C and polyester D are chip-blended to give approximately polyester 96.
7 parts by weight, 0.2 parts by weight of internal particles, 0.0 parts by weight of calcium carbonate.
A composition consisting of 1 part by weight and 3.0 parts by weight of carnauba wax was obtained.

Using this polyester for the sheath and polyester:C for the core, after drying under reduced pressure, the discharge amount of the core and sheath was adjusted to a volume ratio of 8.
Composite spinning was carried out at a spinning speed of 1350 IX 11/min at a ratio of 5:15, and after winding, the hot roller temperature was 89°C, the hot plate temperature was 130°C, and the drawing speed was 900 trr*/min. A round cross-section polyester filament of 75D-24 was obtained.The strength of the filament was 4.7.
g/eL and elongation was 35 inches. When the yarn-based friction coefficient was measured using this polyester filament, it was found to be 0.33, which was good, and when a tube knitted fabric was prepared and the color tone was measured, the b value was found to be 1.2, which was good. Moreover, the sliminess was also good, and the abrasion resistance was also good at grade 3.

Example 2 (Experimental Example 42-12) Polyester of Example 1: In the same manner as B, instead of calcium carbonate, dry silica R-972) with an average particle size of 0.5 μm was added, and 3.0 weight of silica was added. % of polyester was obtained. (Polyester: E) A polyester containing 3.0 parts by weight of kaolinite having an average particle size of 0.9 μm was obtained in the same manner as in Polyester: B of Example 1. (
Polyester: F) Polyester containing 15.0 parts by weight of beeswax (polyester: G) and polyester containing 15.0 parts by weight of montan wax (polyester: H) in the same manner as polyester: D of Example 1 A polyester containing 15.0 parts by weight of hexyl montanate (polyester=1) was obtained.

These polymers and the polymer obtained in Example 1 were each chip-blended in the same manner as in Example 1 to obtain the compositions shown in Experimental Examples 2 to 12 in Table 1, and yarn-spun in the same manner as in Example 1. A polyester filament was obtained. These polyester filaments can be used to improve strength and elongation.
The system friction coefficient was measured, and after creating a tubular knitted fabric, the color tone, sliminess, and abrasion resistance were measured. The results are shown in Table-1.

Experimental example 2.3.4 does not contain both fine particles and a higher aliphatic monocarboxylic acid ester compound, so it has a high coefficient of friction and is poor in sliminess, whereas Experimental example 6 contains a higher aliphatic monocarboxylic acid ester compound. Since the amount is small, the friction coefficient is high and the sliminess is poor. Further, in Experimental Example 12, the wear resistance was poor due to the large amount of fine particles. Experimental example 5.7.8
9.10.11 was within the scope of the present invention, and was excellent in strength and elongation, color tone, sliminess, and abrasion resistance.

Example 5 Polyester: A polycondensation reaction was carried out in the same manner as in A,
After the reaction, 30.0 parts by weight of carnauba wax (based on 100 parts by weight of polyester) was added and kneaded under reduced pressure for about 20 minutes until the intrinsic viscosity was 0.52 and the internal particles (average particle size 1.
A polymer containing 10.55 parts by weight (based on 100 parts by weight of polyester) of 0.0 μm was obtained. (Polyester: J) Polyester: A,, f'Resnal: C,, t? I.J.
Ester = D, polyester: E1, polyester: J were chip-blended so that the internal particles were 0.1% by weight and the dry warping force was 0.5% by weight, and the same as Example 1 except for the volume ratio of the discharge amount of the core to the sheath. A polyester filament was obtained by spinning and drawing in the same manner. Using these polyester filaments, strength and elongation and yarn-based friction coefficient were measured, and after creating a tube knitted fabric, color tone, sliminess, and abrasion resistance were measured.

The results are shown in Table-2.

As is clear from Table 1-2, A that is within the scope of the present invention
I 3.15.17 had excellent strength and elongation, color tone, sliminess and abrasion resistance, but 4 with a high sheath cross-sectional area ratio
14.16 and Ken 18, whose carnauba wax content was outside the range of the present invention, had low strength and poor color tone.

Comparative Example 1 Butyl stearate (carbon atoms: 22) was blended into chips of the polyester=FX of Example 2 in an amount of 2% by weight based on the polyester. This polymer was spun in the same manner as in Example 1 to obtain polyester filaments. When a tubular knitted fabric was made using this polyester filament and its color tone was measured, the b value was 5.
3, which had a strong yellow tinge and was unusable.

Comparative Example 2 A polyester containing 40 parts by weight of calcium carbonate and having an average particle size of 5 μm was obtained in the same manner as in Polyester 2B of Example 1. Chip blend this polyester with polyester 2A, polyester: C1 polyester = D,
A polyester mixture containing 0.2 parts by weight of internal particles, 0.1 parts by weight of calcium carbonate having an average particle size of 5 μm, and 1.0 parts by weight of carnauba wax was obtained. This polyester mixture was spun in the same manner as in Example 1 to obtain polyester filaments. A cylindrical knitted fabric was prepared using this polyester filament and its abrasion resistance was measured, and it was found to be grade 1, which was poor in abrasion resistance.

Example 4 87 parts by weight of terephthalic acid and 42 parts by weight of ethylene glycol were charged into an autoclave and heated to 15 kg at 220°C.
The esterification reaction was carried out under a pressure of /ad, and after the reaction rate reached 50%, the esterification reaction was completed while gradually increasing the temperature under normal pressure. This reaction product was made into an ethylene glycol slurry with 0.0% wet silica with an average particle size of 0.8μ.
6 parts by weight were added. Furthermore, magnesium acetate 0.06
parts by weight, 0.05 parts by weight of lithium acetate, 0.02511 parts by weight of antimony trioxide, 0.0 parts by weight of trimethyl 7-mole 7-ate.
0.08 parts by weight and 0.01 parts by weight of phosphorous acid were added, and a polycondensation reaction was carried out by a conventional method. Furthermore, after the completion of the polycondensation reaction,
After adding 6.0 parts by weight of carnauba wax under normal pressure, the mixture was kneaded under reduced pressure for 15 minutes.

Magnesium is present in the resulting polyester.

0.07 parts by weight of internal particles consisting of lithium and phosphorus elements,
It contained 0.06 parts by weight of wet silica and 6.0 parts by weight of carnauba wax. Polyester filaments were obtained from the polymer in the same manner as in Example 1. The strength was 4.7 g/d and the elongation was 35%. In addition, a tubular knitted fabric was created and its characteristic values were measured. Thread-system friction coefficient is 0.3
0, which is good, and the b value, which is an indicator of color tone, is also 1.5.
(!-It was good. Ten out of ten panelists judged that it had sliminess, and the sliminess and properties were good, and the abrasion resistance was also good at grade 3.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an apparatus for measuring wear resistance. 1: Sample 6: Friction table 2: Friction cloth 7: Su4 dopeno (-5 two heads 4: Holder 5; Load

Claims (1)

[Scope of Claims] A polyester fiber having a substantially core-sheath structure/with an average particle size of 0.05 per 100 parts by weight of polyester whose main repeating unit in the sheath is ethylene terephthalate.
Contains 0.005 to 2.0 parts by weight of fine particles of ~3μ and P of a compound whose main component is a higher aliphatic monocarboxylic acid ester having 34 to 65 carbon atoms represented by the following formula, and The cross-sectional area ratio of the sheath to the fiber cross-sectional area is 1%.
A polyester fiber characterized by having a content of 30% or more. 1.0≦P≦(60-R)/2 (where R is the ratio (%) of the cross-sectional area of the sheath to the cross-sectional area of the fiber)