JPS58186612A - Pilling-resistant polyester fiber and its production - Google Patents

Abstract

PURPOSE:A specific polyaryl phosphonate or the like is mixed with polyester during the period from the polymerization completion to immediately before the spinning, then they are subjected to melt spinning to produce the titled pilling- resistant fiber with its strength reduced by ester chain breakage caused by hydrolysis on dyeing. CONSTITUTION:A polyaryl phosphonate and/or polyaryl phosphate of the formula (a is 0, 1; n is polymerization degree when the relative viscosity in a mixed solvent of 1:1 tetrachloroethylene and phenol satisfies the equation: 0.05<=etaSP<= 0.35) is mixed with a polyester polymer such as polyethylene terephthalate during the period from after the completion of polymerization to just before the spinning so that the intrinsic viscosity of the drawn polyester yarn [eta] and the content of the phosphorus in wt% satisfy the equation: W=[eta]<2.1>+ or -0.05 and 0.40<=[eta]<=0.58. Then, the resultant polymer is subjected to customary melt spinning to give the objective fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on polyarid=! The present invention relates to fibers in which phosphonates and/or polyarylphosphates are uniformly dispersed in polyester polymers, and a method for producing the same.

The purpose of the present invention is to easily break the ester bonds of polyester fibers by hydrolysis during dyeing without causing any problems in the process from spinning polyester to knitting fabrics and fiber properties, thereby causing a decrease in strength and elongation. Pi/L when wearing clothes
/ This is intended to prevent pilling.

Traditionally, synthetic fibers such as polyester and polyamide have excellent physical and chemical properties and have been used for many purposes, and have also greatly expanded into the field of natural fibers such as cotton and wool. Ru. However, even such synthetic fibers have some drawbacks, one of which is the pilling that occurs while wearing clothes, and in terms of appearance and texture, there are no buildup and resistance. Pill fibers have long been desired.

Currently, the following two methods are available to prevent bill lv from occurring.
It is broadly divided into The first method is to reduce the strength and elongation of fibers.1 For example, use low [η] woven fibers, easily hydrolyzable fibers, fibers with defective structures such as kutsutsuku, or fibers with low strength and elongation due to solvents or mechanical damage. One method is to add Ni here to achieve a low strength and elongation ratio, and the second method is to make the fibers into irregular cross-section fibers, or to post-process them with resin, burning, etc. to suppress the buildup. However, the latter anti-pilling method does not provide a satisfactory anti-pilling effect when worn for a long time, and the post-treatment method has problems such as changes in the physical properties of the fabric and wash resistance.

In addition, in the former method of lowering the strength and elongation of fibers, the formation of low [η] fibers and defect structure fibers tend to cause fluff breakage during spinning and drawing, and furthermore, cause top lv during the spinning, knitting, and weaving process. Easy to operate and poor operability. In addition, special processes are required to reduce the strength and elongation of fibers through post-treatments such as solvents and mechanical damage, which has disadvantages such as difficulty in controlling fabric shrinkage and tear strength. .

Therefore, it is considered that the optimal method for obtaining pill-resistant polyester fibers at present is to cause hydrolysis to occur easily and within an appropriate range during dyeing after fabric formation to reduce strength and elongation. For this purpose, it is necessary to add an appropriate amount of easily hydrolyzable substances to the polyester fibers in advance, and examples of such easily hydrolyzable substances include phosphorus compounds found in JP-A-50-135551 and JP-A-5O-125515. Copolymerization of Schifnol compounds disclosed in JP-A-51-155551 and JP-A-53-124562, or copolymerization of sulfone group-containing compounds disclosed in JP-A-54-46695. etc. have been proposed. By the way, in order to copolymerize these into polyester A/, it has been usual to add easily hydrolyzable substances between before the transesterification reaction and before the polymerization to polymerize the polyester. However, this method tends to cause problems such as a decrease in heat resistance due to diethylene glycol and poor processability due to agglomeration of the matting agent Tr02, and problems such as loss and contamination due to switching of polymers. On the other hand, as seen in Japanese Patent Publication No. 47-32297 and Japanese Patent Publication No. 47-52299, a method for obtaining flame-retardant fibers by blending polyaryl phosphonate tP with 0.4 to 4.0 weight percent of Boriesde A/ is known. However, as in the present invention, the specific viscosity (
By regulating the relationship between the degree of polymerization) and the phosphorus content of the polyester/I/drawn yarn, hydrolysis of the fiber occurs in hot water treatment such as dyeing, and the hot water treatment time at 150°C is 60
When the temperature exceeds 10 minutes, the hydrolyzability decreases and the ester bond cleavage rate approaches a constant value, and as a result, the process from polymer to knitting and weaving is good, and after dyeing, the optimum strength and elongation as anti-bi-μ fibers can be easily achieved. There were no sustainable polyester fibers or methods for producing them.

Against this background, the present inventors have made efforts to obtain a polyj stellate fiber that has good process passability and is easy to reduce strength and elongation during dyeing while taking advantage of conventional fiber physical properties and has a pile-pilling property that does not prevent building from falling off. The present invention was arrived at as a result of repeated research.

That is, in the present invention, a polyaryl phosphonate or/and a polyaryl-p phosphate represented by the following general formula (1) is used in a polyester fiber.

Intrinsic viscosity [η] and phosphorus content W of the polyester drawn yarn
(% by weight), the ester bond cleavage rate by hot water treatment at 130°C x 60 minutes and at 130°C x 120 minutes is calculated as follows: When Be2 (Be2-B
e1)/BC1≦0.3, and the product DTxDE of single fiber strength DT (Q/dr) and dry elongation DB ($) after hot water treatment is 20 to 80. The present invention relates to an anti-build polyester fiber characterized by the following properties and a method for producing the same.

The polyester fibers referred to in the present invention are, for example, aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, naphthalene dicarboxylic acid, and phthalic acid; aliphatic dicarboxylic acids such as adipic acid and sebacic acid; or esters thereof. and ethylene glycol, diethylene glycol
#, 1.4 sl butanediol, neopentyl glycol, and other diol compounds. Particularly preferred are polyesters in which 85 or more of the repeating structural units are polyethylene terephthalate.

In addition, the above polyester components include/realkylene glycol, glycerin, and pentaerythritol.

Methoxydarylkylene glycol, bispheno-A/
A copolymer of sulfoisoheptalic acid, a silicon compound, etc., or an additive of 5 kg or less by weight, such as a matte remover, a heat stabilizer, and an ultraviolet absorber.

It can be stuttered by containing pigments or antistatic property improvers.

In addition, in the present invention, composite fibers made of polyester polymers with a difference in [η] (difference in degree of polymerization) or a difference in modification, or cross-sectional fibers with circular, hollow, polygonal 9 surface irregularities, flat shapes, U-shapes, etc. Fiber forms include spun yarn, drawn yarn, false twisted yarn, and interlaced yarn.

There is no problem in using all types of yarn such as Tasfun yarn, M yarn with 9 knots, and covering yarn.

As easily hydrolyzable substances, polyaryl phosphonates and/or polyaryl phosphates represented by the general formula are advantageous in the following points (4 to 4); , one blocked with an alkoxy group or the like may also be used.

(The weight loss on heating in N2 at 450°C for 10 minutes is 5 wt% or less, preferably 5 wt% or less, and there is little discoloration or decomposition during the period from polymerization to spinning.

(b) Those that have a similar solubility buff meter to polyester, have good compatibility with polyester, have a melting point of 250°C or lower, and can be mixed with polyester in solution form, (c) Those that exhibit little change in the viscosity of polyester during addition and mixing or after spinning. The higher the molecular weight, the better in terms of bleed-out to the fiber surface, but an optimum molecular weight is required in terms of dispersibility and hydrolyzability in polyester. Specific viscosity η for polyaryl phosphonates or polyaryl phosphates
Hatake is 0.05≦.

It is preferable that the degree of polymerization is ≦0.55t. The polyaryl phosphonate and Hyporia of the present invention can control the degree of decomposition (lower strength and elongation of fibers). J-N
*Y, Hate is produced by adding a nearly equal mixture of dihydroxydiphenylsulfone and phenylphosphonic dichloride or phenylphosphonic dichloride under an inert gas at normal pressure and then under reduced pressure at 150 to 280°C, using magnesium chloride or as a catalyst. A melt polymerization method in which calcium chloride is added and polymerized, or an interfacial polymerization method in which dihydroxydiphenyl sulfone is dissolved in water as an alkali metal salt and reacted with a methylene chloride solution of phenylphosphonic dichloride or phenylphosphonate dichloride under stirring, or 1 ．． L2.2 Known methods can be used, such as a solution polymerization method in which polymerization is carried out in tetofuchloroethane using pyridine or calcium chloride as a catalyst and coagulated in methanol as a non-solvent.

Also, in order to block the terminals, during or during the polymerization of polyarylphosphonate or polyarylphosphate There is no problem in carrying out the reaction in a solution.

The present inventors also found that the phosphorus compound had a specific viscosity of η8 representing the degree of polymerization. It was found that the ester bond cleavage rate during hydrothermal treatment follows different curves when the ester bond is different. That is, Figure 1 is a model diagram showing the relationship between 130℃ hot water treatment and ester bond cleavage rate when polyaryl/l/yh sulfonate or/and polyaryl phosphate is kneaded. Curve (A) shows a typical tendency when the specific viscosity '7sp of the phosphorus compound is 0.05≦, ≦0.55, and curve (B) shows a typical tendency when , is higher than 0.35. The difference between these curves (A) and (B) has an important meaning in selecting the degree of polymerization of the phosphorus compound, as will be understood below.

η8. If it is less than 0.05, the viscosity changes greatly when added to the polyester polymer, which tends to impair spinning and drawing properties, and bleed-out to the fiber surface becomes large, which is undesirable. 6. If exceeds 0.35t-, the first
As shown in the curve (B) in the figure, the esthetic bond cleavage rate in hot water treatment at 150°C for 60 minutes is -0.05≦η, ≦0.5
The hydrolyzability decreases to be smaller than the curve (mu) in case 5, and the decrease in fiber strength and elongation is not constant between the case of one dyeing and the case of two or more dyeings such as re-dying, and there is a large difference in anti-building effect. There are disadvantages such as the occurrence of The reason for this is that the phosphorus compound is uniformly dispersed in the polyester polymer with almost no alteration, and hot water decomposes the phosphorus compound and simultaneously cuts the polyester main M, but the degree of polymerization (specific viscosity) of the phosphorus compound is low. The easier it is to decompose, and the higher the degree of polymerization, the more gradually it decomposes, and as a result, the songs m(A) and (
It is thought that this pattern shows pattern B).

Therefore, in terms of hydrolytic stability, 0.05≦17s, ≦0
．． The pattern of the curve (mu) seen in 35 is better than [1(B)]. To put this numerically, if the ester bond cleavage rates of 150 ℃ x 60 minutes and 130 '' CX 12 G hot water fl&amp;
e2-Be1)/BC1≦0.5 power I L (, CB
O2BOl)/BC, ≦0.2 is more preferred. The specific viscosity here is 5 ptf tetofuclolethane/pheno-/
' = 'A (1 quantitative ratio) mixed solvent L/% s
o' (H) Using a Kuppelohde viscometer, the falling time of the solvent alone is 0, and the falling time η1 of a solution in which 0.1 f of the sample is dissolved in 10 ee K of the solvent is measured, ri, = (η1 - ri 0)/
It is determined from η0. In the case of the phosphorus compound of the present invention,
'7sp'' 0.05 to 0.35 indicates a degree of polymerization ranging from about 5 to about 25.

The ester bond cleavage rate Be is calculated from [η] before and after the hot water treatment in the following order, and a cleavage rate of 0.5 means that all molecular chains have been cleaved in half.

■GrjeJ formula (W) = 1.27×10″Mn
Calculate the molecular weight Mn from '°86.

■If the average number of molecular breaks/one molecular chain is m, then m = (M
no-Mn1) / MntMno: Molecular weight before hot water treatment Mn1: Molecular weight after hot water treatment In the present invention, the polyarylphosphonate or/and polyarylphosphate obtained as described above is used after the completion of polymerization of the polyester polymer and immediately before spinning. It is necessary to add it in melt or powder form and mix it.

Adding the additives before polymerization of the polyester is undesirable because it tends to cause changes in the viscosity of the polymer and decomposition side reactions of the additives. t
+ the additive is uniformly dispersed in the polyester polymer;
In order to reduce the top μ, it is more preferable to melt the additive, inject it into the polyester polymer just before spinning, and mix and disperse it in a ladle using a static mixer or the like.

Furthermore, if the melt viscosity of the additive is too high, mixing with the polyester polymer is likely to be insufficient in the kneading method immediately before spinning, so the phosphorus compound has a heating loss of 20% when heated at 500°C for 10 minutes under nitrogen gas. % or less heat resistant thinner (
For example, it is desirable that the melt viscosity of the mixed additive at 200° C. be 50 voids or less by t-addition (for example, low-viscosity phosphorus compounds, polyethylene glycol compounds, etc.). However, the viscosity reducing agent is compatible with polyester and has 1 coloring and 9 decomposition.

Since it does not cause any reaction, the amount added is small. i
When melting the companion additive, the temperature is preferably around 200° C. in view of decomposability, energy saving, temperature change during addition of polyester A, etc.

One of the requirements of the present invention is that the formula (2) (%) holds true between the intrinsic viscosity [η] of the drawn polyester yarn and the phosphorus content W (by weight) of the drawn yarn. is necessary. Here, [ri] means the intrinsic viscosity measured using a mixed solvent of equal amounts of tohatetofchloroethane and phenol in a constant temperature bath at 50°C using an Utsuberohde viscometer, and the phosphorus content is determined by the colorimetric method of elemental analysis. The figure shows the weight of phosphorus in the drawn polyester yarn. However, the phosphorus content includes polyarylhonufonate or polyaryl-μ phosphate alone or a mixture of both, and does not include the low-viscosity phosphorus compound used as a viscosity reducing agent.

Note that the term "drawn yarn" includes yarns obtained by omitting the drawing step during high-speed spinning, partially drawn yarns, false-twisted yarns that do not like stretching, spun yarns, and the like.

FIG. 2 shows the relationship between the intrinsic viscosity [η] and the phosphorus content W (wt%) of the polyester drawn yarn obtained by the present invention,
The shaded area is W=(η)21±0.05 and 0.40≦[η
]≦0.58. When [η] of the drawn yarn is less than 0.40, there are problems such as fuzz and breakage during spinning and drawing, fiber damage during spinning and production of white powder, and an increase in cost. Also, [η] is 0.58
If it exceeds 100%, a large amount of phosphorus compound that easily hydrolyzes is required, and it is difficult to pass through the process from spinning to processing.
It is difficult to control low strength and elongation due to hydrolysis, which is undesirable because it increases costs and causes pollution.

As shown in FIG. 1, the higher the content of the phosphorus compound, the easier it is to be hydrolyzed, but there is an optimum content N (shaded area in FIG. 2) as shown in equation (2). When the content is lower than the formula (2), there is less decrease in [η) after hot water treatment such as dyeing, and as a result, the single fiber strength DT (IF/dr) and dry elongation DI (%) cy ) Product DTxDE Kaa O The fibers are too strong and do not exhibit a satisfactory anti-building effect. (
2) If the content is higher than the formula, [η] after hot water treatment is too low and becomes less than 2o in DTxDE, and although pi is not generated, the fiber fuzz is easily torn off, spoiling the appearance of the fabric and at the same time reducing the quality of the knitted fabric. It cannot maintain the strength and elongation required to form a fabric, making it extremely vulnerable to tearing, abrasion, bending, etc.

As a result of intensive studies, the present inventors have found that, in terms of building shedding and fabric strength and elongation, the product of single fiber strength and elongation, DTxDF-, is preferably 20 to 80, more preferably 50 to 5°. .

Furthermore, the strength and elongation (for example, DT
xDE is 100 or more), and as a result of studying various compounds kneaded into polyester fiber for the purpose of achieving the specified strength and elongation referred to in the present invention during processing such as dyeing, it was found that heat resistance, 1 dispersibility, hydrolysis, The inventors have discovered that pile building fibers can be easily obtained by kneading polyaryl μ phosphonate or/and polyaryl phosphate, which satisfies properties such as properties, into [η] of the drawn polyester yarn in an optimum range.

In addition, hydrolyzability changes depending on the temperature and time of hot water treatment such as dyeing, but in the present invention, after hot water treatment, for example, typically at 130°C for 60 minutes, DTxDE can be in the range of 20 to 80. is necessary. However, the final product is DTxDE.
It is sufficient if the temperature is 20 to 80, and the hot water treatment conditions are 130℃×
The time is not limited to 60 minutes, and there will be no problem in changing the processing conditions such as dyeing.

5M below! The present invention will be specifically explained by examples.

Example 1 'rio2- Polyethylene terephthalate chips containing o, o a % were extruded using a 40φ extruder and placed in a stock solution tube of the polymer.
The following mixed additives having a viscosity of 0 poise are injected into the polyester polymer so that the polybisphenol sulfone phenyl phosphonate is 5.0% by weight (phosphorus is 0x25% by weight), mixed with a static mixer, and then mixed with a nozzle. spun.

The results of elemental analysis and NMR revealed that since the polyaryl phosphonate was prepared by melt polymerization and purified using chloroform and methanol, both ends of the polymer were not blocked and chlorine remained. Then, the spun yarn was
Focusing on a tow of 00,000 dr and drawing in two stages in a water bath... Formula 3
．． Stretched 8 times, mechanically crimped and cut to 5drX76
MIM tape/L' was created. In addition, [η
] is 0.491 dl, /9, the phosphorus content determined by colorimetric method is o, 2b%, and the phosphorus content of polybisphenolsulfone phenylphosphonate after subtracting the phosphorus content of the thinner is 0.23 %, which satisfies the relationship of equation (2) (the shaded area in FIG. 2).

The obtained spun yarn and drawn yarn were observed using an electron microscope, and it was found that no aggregation of the E polyarylphosphonate was observed and it was uniformly dispersed. Further, there was no fluff breakage during spinning and drawing, and no particular problems were observed in either smoke generation, coloring, or viscosity change. Further, the production of differential thermal analysis and NMRj lydiethylene glycol was small, and the melting point was 261°C, which was the same as that of ordinary polyester fibers.

The obtained stay 7"/l/ was made into a 40-count cotton spun yarn and used for the warp and weft yarns to create a 2/2 twill fabric, but no tofu pull occurred during the spinning and weaving processes. After relaxing and heat-setting the fabric, it is lightly raised and treated with disperse dye using a high-pressure winch at 130°C.
A woolly polyvarnish for fall and winter, dyed for 60 minutes and shirred? /3 Pilling of the polyester fabric obtained from L'm product.

Table 1 shows the evaluation results of fiber physical properties, etc.

As Comparative Example 1, the specific viscosity η of the polyarylphosphonate
Polyester fabrics were prepared in the same manner as in Example 1 using 8p with 0.40 K (degree of polymerization 3 (around 3)) and with Comparative Example 2 where the amount of polyarylphosphonate added was 1.5 coul. The evaluation results are also listed in Table 1.

\ / The spun yarn obtained in Example 1 has a DTxDE of 144.3, which is sufficient strength and elongation up to the weaving process, and when dyed at 130°C for 60 minutes, the DTXDE of the unraveled yarn becomes 57.
2, it was found that the strength and elongation decreased. Furthermore, 180
There was only a slight decrease in strength and elongation due to °C heat setting and light brushing.The ester bond cleavage rate was 150 °C.
×0.17 after 60 minutes of hot water treatment, 0 after 120 minutes of treatment
．． The cutting rate change between 60 minutes and 120 minutes treatment (BC2BCl) /B (31 is 0.18, and there is no significant difference in fiber properties between once dyed and twice dyed. 9. Pilling of textiles In the evaluation, ICI method 10 hours grade 4-5, 20
It passed grade 5 in time, and there were no particular problems such as tearing strength 2 fluff falling off.

Comparative Example 1 is a case where a polyary-phosphonate with a high specific viscosity (degree of polymerization) is used, but the curve (B) in Figure 1
BC with 130'C x 60 min hydrothermal treatment ring.
, was o and 11-, so the decrease in strength and elongation was smaller than in Example 1, and the pilling was 3-4 grade, which was a slightly poor result. Further, double dyeing caused a large decrease in strength and elongation.

Comparative Example 2 had a low phosphorus content of 12 wt-, so there was little decrease in strength and elongation due to dyeing, and with DTxDE = 122, pilling was grade 2-3 after 10 hours and grade 1-2 after 20 hours, which was a failure. .

Example 2 Semidal polyethylene tere-7 tallate bolamer containing Tie2=0.45% η, p==Q, Q y (1
&& In a~7), polypisphenol sulfone phenyl phosphate, which is not end-blocked, was injected in a solution form to the polyester polymer at a concentration of 4.0 wt% (0.51 vt% for phosphorus) and mixed with a static mixer. Shinozuyyo) I spun it.

The obtained spun yarn was collected into t-100,000 dr, and subjected to water bath drawing, crimping and cutting according to a conventional method, and a stave /I/ of t5 dr x 38 mm was made with 20 # of spun yarn and tightened with 30 i of 1 hand spun yarn.
I created a 4 gauge Tenjikumaru version. 97.
, 170℃ heat -1! '/) After that, it was treated with hot water for 130'c x 60 minutes and used as a pilling test sample, and the physical properties if! The results are shown in Table 2.

Table 2 There was only slight fuzz breakage in the spinning and drawing process, and there were no particular problems with smoke generation during spinning, coloration, viscosity change, and filter clogging due to agglomeration of T i 02. The drawn yarn has [η) = o, s 5 dl/y and phosphorus content = 0.
3 ft- and satisfied formula (2). The single fiber strength and elongation of the spun yarn was 5.8 f/dr-41%, and there was no problem in the spinning and knitting processes, although the strength and elongation decreased significantly due to the hot water treatment. The ester bond cleavage rate BC1 calculated from [η] before and after hot water treatment at 130°C for 60 minutes is 0.27%K<
, after hydrothermal mfll (η) = 0.59 DTXDE
= 72.5, pilling was grade 4 in 5 hours, 4- in 10 hours
It was a satisfactory grade 5. It was found that the pilling of the knitted fabric before hot water treatment was poor, being 2nd grade for 5 hours and 1st grade for 10 hours, and that the anti-pilling effect was only exhibited when the strength and elongation were reduced by hydrolysis.

Example 3 After lamination of semi-dull polyethylene terephthalate, η,
, = 0.28 (polymerization degree 15-2G) polybispheno-μ sulfone phenylphosphonate, one end of which was blocked with a phenoxy group, was added to prepare a polyester chip in which the phosphorus compound was uniformly dispersed. Next, the chips were extruded using a 50φ extruder to obtain a spinning yarn (A) obtained at a spinning speed of 1000 m/sit, and a spinning yarn (A) obtained at a spinning speed of 2400*/m using ordinary polyester y containing no phosphorus compound. Two types of yarns (B) were aligned and drawn and false twisted at the same time.

The filoadr is determined by the spinning speed (difference in elongation) of the obtained false twisted yarn.
-2Of(B) Ji! Is fiber the core thread? 0dr-72
The (mu) fiber of f was the outer peripheral yarn, and the yarn was a two-layer textured yarn with a yarn length difference of 2o-. In addition, the (mu) fiber kneaded with a phosphorus compound has a [g]=0.46. Phosphorus content = 0.21 v
The single fiber strength and elongation at t% was 2.6 #/dr-45-.

The false twisted yarn was twisted at a rate of 250 times/m to form warp yarns and 4' yarns to create 115 fill fabrics.
Heat setting and slight napping were performed, and dyeing was carried out at 135°C for 40 minutes. Note that most of the fuzz on the surface of the fabric was (mu) fibers containing phosphorus compounds.

When the weft of the woven fabric was unwound and the single fiber strength and elongation of the fibers was measured, it was 1.8 f/dr -27% and pilling was grade 4-5 at IC 110 hours. A woven fabric with anti-pilling property 9 wool, which is not found in processed yarn woven fabrics, was obtained.

[Brief explanation of drawings]

Figure 1 shows a case where the phosphorus compound of the present invention is kneaded.
A model diagram showing the relationship between the time of hot water treatment at 30°C and the ester bond cleavage rate. Figure 2 is a diagram showing the relationship between the intrinsic viscosity [η] and phosphorus content W (wt%) of polyester drawn yarn. ,
The shaded area is the range that satisfies equation (2). Procedural amendment (spontaneous), Indication of the Do case, Patent Application No. FF1786 No. 2, 1982, Name of the invention: Anti-build polyester fiber and its manufacturing method 1, Sakuzu, Kurashiki City
621 (108) RiRa Co., Ltd. Representative Director Tsuguo Okabayashi 4, Agent 2045-1 Aoeyama, Sakazu, Aichikai-shi (1) The scope of claims column of the specification will be corrected as shown in the attached sheet. (2) On page 8, line 9 of the specification, the statement ``And the unit after hot water treatment'' is corrected to ``And the final product after hot water treatment!--9 units.'' Above Description Book 12 Name of the invention Anti-build polyester fiber and method for producing the same 2, Claims [1] A polyester fiber containing a polyaryl phosphonate or Fi/and a polyaryl phosphonate represented by the following general formula (1) Intrinsic viscosity [η] and phosphorus content W (wt%) of the polyester drawn yarn
), and the ester bond cleavage rate by hot water treatment at 130°C x 60 minutes and 130°C x 120 minutes is calculated as BCl and BCl, respectively. When to do (BO2-BC
I)/BCI≦0.3 and the single fiber strength DT (f/dr) and dry elongation DE (
%) (2) A pill-resistant polyester delicacy characterized by having a product DTXDE-ttL of 20 to 80. (2) After completion of polymerization of the polyester polymer and immediately before spinning, a polyaryl phosphonate or #i/ and a polyaryl phosphonate represented by the following general formula (1) are added to the polyester drawn yarn after spinning to obtain an intrinsic viscosity [η] and a polyaryl phosphonate. A method for producing anti-pilling polyester fibers, which comprises mixing so that the phosphorus η content W (direction 1 inch) satisfies the formula (2) (% formula %) and bath-melting the mixture by a conventional method. [3] Add phosphorus compound in advance! 3. The method for producing anti-pilling polyester fiber according to claim 2, which comprises injecting the fiber into the polyester polymer immediately before melting and spinning and mixing in a static mixer. r41 Heating loss at 300℃ x 10 minutes under N2 is 20-
A method for producing a pile-building polyester fiber according to claim 1Q13, characterized in that the following viscosity reducing agent is added to and mixed with a phosphorus compound so that the melt viscosity of the mixed additive at 200° C. is 50 voids or less.

Claims (1)

[Scope of Claims] [1] Polyaryl phosphonate or/and polyaryl phosphate represented by the following general formula (1) % formula % (1) is contained in the polynisder fiber, and the intrinsic viscosity [η ] and phosphorus content W (weight)
The ester bond cleavage rates of BCl and B( 32 (Be2-B
e, ) /BC1≦0.3 and single fiber strength DT (g/dr) and dry elongation DB (哄) after hot water treatment
1. A pile-pillar polyester μ fiber having a property that the product DTxDK is 20 to 80. [2] After completion of polymerization of the polyester polymer and immediately before spinning, polyaryl phosphonate or polyaryl-μ phosphate represented by the following general formula (1) % formula % (1) is added to the polyester drawn yarn after spinning. An anti-pilling polyester characterized in that it is mixed so that the viscosity [η] and the phosphorus content W (weight) satisfy the formula (2) (% formula %), and the mixture is melt-spun by a conventional method. Fiber manufacturing method. [5] The method for producing anti-pilling polyester fiber according to claim 2, characterized in that the sarin compound is melted in advance, injected into the polyester polymer immediately before spinning, and mixed in a static mixer. (4) Adding and mixing a thinner with a viscosity reduction of 20 or less under N2 under N2 for 10 minutes at 200°C to make the melt viscosity of the mixed additive 50 voices or less at 200°C. A method for producing anti-pilling polyester fibers according to claims 2 and 3.