JPS6134277A - Production of polyester fine dienier yarn improved in dyeability - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a method for producing fibers with extremely small fineness (hereinafter referred to as "fine fineness yarn"), and more specifically, the present invention relates to a method for producing fibers with extremely small fineness (hereinafter referred to as fineness yarns), and more specifically, a method for dividing and dyeing a splittable composite yarn containing polyand as a splitting component. - It relates to a method for producing polyester fine-grained yarn with improved color properties, and also relates to a method for producing a woven or knitted fabric made of these fine fibers A.

[Prior art and its problems]

In recent years, many methods for manufacturing fine yarns and fabrics made from fine yarns have been disclosed, and many fiber structures having unique performances never seen before have been developed. How to bond polymers with poor adhesiveness to each other in the fiber axis direction (
A processing tube is processed without dissolving specific components from the composite split-type composite yarn and without applying any mechanical action.

As a technique for manufacturing fine-grained yarns or fabrics made of fine-grained yarns by peeling between components, many methods have already been disclosed in which a specific component is treated with a drug that has a swelling effect. Most of the composite yarns applied to these techniques use polyamide as a splitting component and POIJ x stell as a splitting component. Composite yarns made by combining polyester and polyamide have actually been commercialized because they can be easily divided and the resulting woven or knitted fabrics exhibit excellent texture and gloss. However, since disperse dyes are used to dye the polyester constituting the woven or knitted fabric, the dyes end up staining the polyamide present as a splitting component.

This has the disadvantage of decreasing dye fastness and color development. To avoid this drawback.

The undyed dye applied to the polyester and polyamide is reduced and washed, but this step tends to cause deterioration of the polyamide and is a step that should be omitted if possible.

This is polyester dye other than disperse dye.

Therefore, if it were possible to dye with basic dyes, many of the disadvantages associated with the dyeing process described above could be avoided.

Basic dye town-dyed polyesters can be achieved by introducing sulfone groups into polymers, and many of them have already been commercialized. When this basic dyeable fox polyester having sulfone groups was applied to the above-mentioned splittable composite fiber containing polyamide as a splitting component, it was found that the basic dyeable polyester had a higher affinity for polyamide than ordinary polyester. In comparison, the actual situation is that the fibers are much larger and cannot be easily divided by the above-mentioned chemical treatment alone, but are divided using a combination of mechanical treatments such as a false twisting process and a raising process. When such mechanical processing is used in combination, it is difficult to obtain a product with excellent quality and low manufacturing cost.

The technologies related to splittable composite yarns made of basic dye-dyeable polyester and polyamide that have been disclosed so far include Japanese Patent Publication No. 55-10170 and Japanese Patent Publication No. 55-245.
Publication No. 50, Publication No. 55-47417, JP-A-58-
Sulfonate 2 in Publication No. 70740, etc. i! Processing techniques for basic dye-dyeable polyester/polyamide composite yarns have been disclosed, but these are all rather.

It is a technology that completely increases the affinity between polyester and polyamide and avoids process obstacles caused by separation between the components prior to splitting treatment. Even in the technology, the molar ratio is within the range of 2.0 molar ratio or less, and the more preferable range is 0.5 to 1.0 molar ratio, respectively.
0.2-0.4 mol%, o, 1-0.5 mol%, 0.2
~0.7 moles. If the concentration IJj of the sulfonate group is reduced in this way, it is not possible to obtain a practically satisfactory dyeability for basic dyes.

JP-A-54-96181 discloses that a split composite yarn consisting of a basic dye-dyeable polyester and a polyamide having a sulfonate group basis of 0.1 to 5.0 moles is used as a sheet base material (nonwoven fabric). However, a method is disclosed in which a sheet base material made of fine-grained yarns is produced by treating and dividing the fibers in a heating bath containing a swelling agent for the Mj aggregates constituting the fibers. However, there is no description of the conditions for satisfying both splitability and dyeability with basic dyes. The embodiment disclosed herein is a composite yarn made of a phosphorescent dye-dyeable polyester and a polyamide by copolymerizing a sulfonate group component such that the concentration of the component is between 0.75 and 2.0 mole. Only examples are shown, and there is no mention of dyeability.

The present inventors evaluated the splitting properties and dyeability with basic dyes of the composite yarn obtained according to the disclosed method, and found that the splitting property was relatively stable up to a sulfonic group concentration of 1.8 molar. If the Ia concentration obtained is higher than this, it is difficult to obtain uniform resolution, and at the same time problems tend to occur in reproducibility.In particular, when the concentration is above 2.0 molar concentration, the resolution becomes very poor, and it is difficult to obtain uniform resolution, and at the same time, problems tend to occur in reproducibility. there were. - Dyeability with a universal basic dye requires a sulfonate group of at least 1.8 molar ratio to reach a practically satisfactory density.

[Purpose of the invention]

The object of the present invention is to provide a technique that simultaneously satisfies the separation properties of the polyester component and the polyamide component and the dyeability of the polyester component with basic dyes, as described above. For yet another purpose, using the above technology, it is constructed from fine-grained yarn with a soft texture and a unique touch B and full key.

The purpose of the present invention is to provide a manufacturing technology for a novel fabric that has not only subtle sensory characteristics such as mild luster, but also extremely excellent color development, dyeability, and dye fastness. Through intensive studies from these viewpoints, we have discovered that the above-described splitability and stainability can be satisfied at the same time, and have arrived at the present invention.

[Structure of the invention]

The object of the present invention as stated in ``1'' is 1.0 to 4.
0 mol%, *x polyalkylene glycol t-0,2
~7 Weight width copolymerized polyester and polyester containing no metal sulfonate groups are melt-mixed, and the concentration of the metal sulfonate groups is set to 0.8 to 3.5 mol%, and the polyester is mixed into yarn. A dyeable composite yarn characterized in that a splittable composite yarn in which polyamide components are arranged so as to be divided in a cross section is treated with a treatment agent containing a polyamide swelling agent to divide the splittable composite yarn. Improved polyester fine9. This can be achieved by the thread manufacturing method.

An inophthalic acid component (hereinafter referred to as S component) containing a metal sulfonate group used in the present invention.

Terephthalic acid is a basic dye-dyable polyester copolymerized with 8 and polyalkylene glycol.

Inoftar! , aromatic dicarboxylic acids such as naphthalene-2,6-dicarboxylic acid, or aliphatic dicarboxylic acids such as adipic acid and sebacic acid, triethylene glycol,
1.4-Butanediol.

It can be obtained by copolymerizing the S component and polyalkylene glycol into a polyester synthesized from a diol compound such as neopentyl glycol. Particularly preferred is a polyester copolymerized with a polyester in which 80% or more of the constituent units are ethylene terephthalate units or tetramethylene terephthalate units.

Polyesters containing no metal sulfonate groups used in the present invention include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, or adipic acid.

It is a polyester synthesized from aliphatic dicarboxylic acids such as sebacic acid and diol compounds such as ethylene glycol, 1,4-butanediol, and neopentyl glycol, and in particular, 80% or more of the constituent units are polyethylene terephthalate units or polyesters. Polyesters consisting of tetramethylene terephthalate units are preferred.

In the present invention, the S component is a compound represented by the following formula, and specifically, dimethyl (5,-sodium sulfo) isophthalate, bis-2-hydroquinethyl (5-sodium sulfo) isophthalate, bis-4 -Hydroxybutyl (5-sodium sulfo)in 7-talate, etc. (where M represents an alkali metal such as Na, Li, etc., A, A' represents -CH3, and the symbol represents -(CH2)nOH).

n represents an integer of 2 or more. ) Preferred S components include dimethyl (5-sodium sulfo)in 7-talate, bis-2-hydroxyethyl (5-sodium sulfo)
-sodium sulfo)isophthalate. S
The amount of copolymerization of the components is preferably 1.0 to 4.0 mol%, more preferably 1.2 to 6.0 mol%, based on the acid component constituting the r411 polyester t. If the S component is less than 1.0 mol %, there will be insufficient dyeing seat for the basic dye of the polyester obtained by melt-mixing, which will be described later, resulting in a decrease in dyeability. If the S component exceeds 4.0 molar width, the polymer properties will decrease in combination with the polyoxyalkylene glycol copolymerized at the same time, and the yarn physical properties of the composite yarn obtained from the polyester obtained by melt mixing described below will decrease. At the same time, the affinity with the composite polyamide increases, and the releasability and splitting properties between the components deteriorate. The polyalkylene glycol component used in the present invention preferably has a molecular weight of 90 to 6,000. If the molecular weight is less than 90, the effect of improving dyeability will be small, which is not preferable. Further, a polyalkylene glycol component having a molecular weight exceeding 60,001 fr is undesirable because the light fastness of the dyed fiber obtained from the polymer copolymerized with it decreases. A more preferable molecular weight of the polyalkylene glycol component is 100 to 4,000. Examples of preferred polyalkylene glycols include polyethylene glycol and polypropylene glycol. The copolymerized amount of the polyalkylene glycol component is preferably in the range of 0.2 to 7% by weight based on the resulting polyester.

If it is less than this range, the utilization efficiency of the S component during dyeing will be reduced, and if it is too much, the physical properties of the polymer, especially the heat resistance during melting of the polymer and the heat resistance during heat setting of the obtained yarn or fabric, will decrease. descend.

Therefore, a range of 0.5 to 5 times tS is more preferable. These S components? A method for producing polyester by copolymerizing polyalkylene glycol and polyalkylene glycol is described, for example, in JP-A-57-210.
It is disclosed in the No. 014 publication. The remarkable characteristics obtained by applying the method of the present invention are as a result of copolymerizing polyalkylene glycol as described above, and making it possible to reduce the copolymerization i of the S component. At the same time, due to the viscosity-reducing effect of polyalkylene glycol, S
It is now possible to increase the degree of polymerization at the same level of dyeability and melt viscosity in a polyester copolymerized with components. This is an important characteristic in maintaining the strength of the resulting fiber, and is particularly an extremely remarkable characteristic for the fine-grained yarn B of the present invention. Polyester copolymerized with S component and polyalkylene glycol.

Bath melt mixing with a polyester that does not copolymerize the S component can be achieved by blending the respective fine particles (chips) and then melting them using a normal melting device such as a pressure melter type or extruder type. A static mixer may also be installed. Alternatively, each polymer may be melted separately and then mixed using an extruder or a static mixer. To this invention? The polyamide used for this purpose refers to ordinary synthetic linear polyamides, such as nylon 6, nylon 10. Nylon 11. Nylon 12, nylon 66, nylon 6103, and copolyamides containing these as main components.Among these polyamides, nylon 6 and nylon 66 are particularly preferred.The polyamide component in the present invention is a dividing component. Examples of split-type composite yarns include adjacent-type composite yarns and radial-type composite yarns as shown in Figures 1 to 6, as well as their irregular cross-section yarns and hollow cross-section yarns. The thread can be produced, for example, by the method described in Japanese Patent Publication No. 47-2485.

In order to obtain a fabric with special performance, which is one of the objects of the present invention, each fiber of the component to be divided after one division is 1.0 denier or less, particularly preferably 0.8 to 0.05 denier. It is preferable that there be. Considering this point, the composite ratio of the polymer constituting the composite yarn, the number of 1 divisions 3, and the single yarn edge r of the composite yarn
It is desirable to set x. As already mentioned, the affinity of polyester dyeable with basic dyes by copolymerizing the S component with polyester increases. Although it is possible to reduce the above-mentioned affinity by reducing the copolymerized amount of the S component, simply reducing the copolymerized amount f1 of the S component results in poor dyeability with basic dyes.

In this sense, by copolymerizing the above-mentioned polyalkylene glycol, the effective utilization rate of the eight basic dyes can be improved, and the affinity for polyamide can be increased while suppressing the deterioration of dyeability by copolymerizing the S component. The important point of the present invention is to reduce the amount of polymerization and at the same time control it by melt-mixing it with a polyester that does not substantially contain the S component. Since the polyester haforamide, which does not contain the S component, has poor affinity, even after it is mixed with the polyester containing the S component, the minute region of the polyester becomes the core of peeling at the interface with the polyamide. It is estimated that it exhibits good releasability. In the present invention, the concentration of the S component after mixing is 0.8 molar or more, preferably 1.0 molar or more in order to maintain dyeability, and 3.
The content is preferably 5 mol % or less, preferably 2.5 mol % or less. Mixing ratio of polyester containing S component (hereinafter referred to as C1)
is preferably 20 or more, more preferably 30 in order to ensure uniform dyeability of the polyester fineness yarn after splitting.
% or more. - In order to maintain tensile releasability, the coefficient is preferably 95% or less, more preferably 90% or less. However, when the S component is copolymerized and the concentration of the S component in the polyester reaches 2.5 m, the affinity of the polyester with the polyamide becomes very large. However, good releasability may not be obtained. From this point of view, we investigated the relationship between the concentration of the S component in the copolymerized polyester (hereinafter referred to as SO) and the mixing ratio C1 that is permissible from the standpoint of peelability B and dyeability, and found that the concentration of S component in the copolymerized polyester was determined to be within the following range. It was found that peelability and dyeability can be sufficiently satisfied at the same time by setting
0, that is, 10≦So≦2.5 (mol%), 80/So≦C1≦95 (correspondence) Formula (1)%
Formula (%) 80/So≦C1≦50/So +75 (mesh) Formula (2) is preferably.

FIG. 9 illustrates the relationship between So and C4.

The splittable composite yarn obtained by the method described above is then subjected to a splitting treatment using a processing agent containing a polyamide swelling agent.

Examples of swelling agents for the polyamide include compounds having the following structure (wherein, R is a hydrogen atom or an alkyl group or an aromatic group, and n is an integer of 1 or 2). Specific examples of phenol, 0-phenylphenol, m-/l/
Sol, p-cresol, benzyl alcohol, α-
Examples include methylbenzyl alcohol and phenylethyl alcohol.

Especially toxic and irritating! 1. Benzyl alcohol is most preferable from the viewpoint of safety (8) and working environment (such as odor).Since the above-mentioned dividing agent is generally difficult to dissolve in water, (1) in the present invention, it is emulsified and dispersed in water, or alternatively, it is It is applied as a solution dissolved in alcohol whose solubility in water is 15 or more.

The surfactant that can be used in preparing the emulsified dispersion may be any surfactant that can stably emulsify and disperse, such as nonionic, anionic, and cationic surfactants, and amphoteric surfactants. An example of the alcohol having a solubility in water of 15% by weight or more is ethanol.

Examples include propyl alcohol, ethylene glycol, triethylene glycol, propylene glycol, and tetraethylene glycol, with ethylene glycol B and propylene glycol being particularly preferred. As the dividing treatment agent, 1 dividing agent i'J'+alcohol solution described in I may be used alone, but from the viewpoint of safety, a nonflammable organic solvent is used.

For example, trichloroethane, perchlorethylene, etc. may be added. In particular, it is preferable to add water not only to ensure the above-mentioned safety but also to promote the splitting effect. Naturally, in a treatment agent that adds water, the concentration of the dividing agent can be increased by increasing the alcohol concentration, but the concentration of water in the treatment agent should be kept at 15% or more, preferably 20% or more. This is preferable from the viewpoint of the first division, the texture of the fabric obtained, and the safety during processing.

The concentration of the dividing agent in the processing agent is preferably 2% or more, preferably 4% or more when emulsifying and dispersing it in water (in the case of an alcohol solution, it is preferably 5% or more, but more preferably It is better to set the concentration to 10 or more.-If the concentration of the resolving agent is 3 in both the emulsified dispersion B and the alcohol solution, ftK < 7, especially when heated, the 2)
1. In order to avoid this I:゛) steam 19r, τ damage, it is preferable to suppress the concentration of the dividing agent in the processing agent to 45% or less.

As a method of dividing the composite yarn, it is possible to wind it into a skein shape and process it in an untensioned state, but the fine yarns may become entangled during the dividing process.

Alternatively, entanglement may occur after processing, resulting in poor unwinding properties from the skein and breakage of the tniB fineness yarn.

It is preferable that the treatment be carried out after forming into a fabric such as a woven JP knitted fabric. The treated fabric can then undergo heat-setting, dyeing, and finishing steps to make *sewn products, or it is also possible to unravel the treated knitted fabric to obtain fine yarn. The dividing treatment is preferably carried out at 40°C or lower, particularly preferably by immersing it in a treatment solution at 35°C or lower (T+°C) and then heating it as it is to Mulberry°C.

Alternatively, it is preferable to apply the treatment tL to the treated fabric by, for example, a padding method or a spray method, and then treat it in water at 72°C. During this treatment in water, the tension acting on the fabric to be treated changes the texture and bulkiness of the resulting fabric (h), so it is important to control the tension during this treatment. From the viewpoint of obtaining uniformity of division and bulky feel of the fabric, it is preferable to process the fabric under substantially no tension.

Here, it is particularly preferable that the relationship between T1 and T2 is set as follows.

That is, when the glass transition @ degree of the polymer composited with polyamide is Te (tel), T2 is T, -1-10≦T
2≦T, +15, more preferably T+ + 15≦T2
The range is ≦Tg+10. (T6 of poly(ethylene terephthalate) (odor is 75°C) It is characterized in that the component to be divided is a polymer obtained by melt-mixing a polymer and a polyester that does not contain an S component.

The advantages obtained by using the method of the invention are described below.

(1) It is possible to simultaneously satisfy the dyeability of polyester with basic dyes and the peelability with polyamide.

(2) MA made of strong basic dye dyeable polyester! Thread can be easily obtained.

(3) The fabric obtained by the method of the present invention can be dyed in vivid colors that cannot be obtained with single-disperse dyes, and at the same time, staining by basic dyes on the polyamide side is reduced compared to disperse dyes. I can do it.

(4) Taking advantage of the above various properties, it is possible to obtain a fabric that is vividly dyed and has a unique texture, bulkiness, and luster.

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

Example 1 Polyethylene terephthalate having an intrinsic viscosity of 0.66 with 0-chlorophenol was used at 1 kPa. The isophthalic acid component (S component) containing a metal sulfonate group is dimethyl (5-sodium sulfo) inophthalate at 2.5 °C.
By copolymerizing polyethylene glycol with a molar ratio of 600 and a molecular weight of 600 with 2.0ifi% polyethylene terephthalate, a polymer P+t'' with an intrinsic viscosity of 0.65 in 0-lilophenol was obtained. ) Isophthalic acid) 1 was copolymerized with 2.8 molar polyethylene terephthalate to obtain a polymer P2t- having an intrinsic viscosity of 0.58 in O-chlorophenol.

Poly-(ε-capramide) with a sulfuric acid viscosity of 2.4 was converted into Polymer N.
shall be. Mix 20% of chipped PD and 80% of chipped Pl to make the average concentration of S component 1.8
A mixed polyester (hereinafter referred to as PM1) f having a molar ratio of 4 was obtained. The polymer N is the splitting component L7, and the mixed polyester PM is the splitting component, according to Japanese Patent Publication No. 7-24.
A split-type composite yarn having a split ratio of 5 as shown in FIG. 3 was spun using the composite spinning apparatus shown in Japanese Patent No. 85 (see FIGS. 7 and 8). A pressure melter was used to melt the polymer.

That is, in the composite spinning apparatus VC shown in FIG. 7B and FIG. is discharged through openings 6 and 6'. At this time, polyester PM is removed from the shielding parts 73 and 7' of the cap plate.
, is not ejected. Therefore, the polyester PM is discharged as a lateral polymer flow through the openings 6 and 6' just between the leaves of the polymer N, which is discharged from the discharge holes 2/u and 2 and becomes a five-lobed polymer flow. It will be served. The two polymers thus identified and formed into a polymer flow merge at the opening 8 to form a composite flow having a cross section as shown in FIG. 5, and are discharged from the discharge hole 4. At this time, the composite ratio of the polymer is 2 parts of polymer N and 8 parts of polymer PM.
%. After winding the composite undrawn yarn at a spinning winding speed of 1050 m/min, the Bot pin was
℃ and the stretching ratio was set so that the elongation after stretching was 40%, to obtain a drawn yarn of 75 denier and 56 filaments. This will be referred to as CJF-1. A drawn system of 75 denier 56 filaments was obtained by the same method as CJF-1 using Polymer N as a split component and Polymer P 2 k "ftt as a split component.
-2. 75 denier 36 in exactly the same manner as CJF-2 except that polymer Pat' is used instead of polymer P2.
A drawn filament yarn CJF-5 was obtained. These C.J.
F-1 to CJF-3 Plain woven fabrics having a weave density of 75 yarns/inch in both warp direction B and weft direction were obtained for all warp fd and weft. The plain woven fabrics corresponding to c and rF-s to CJF-1 are designated as FB-1, FB-2, and FB-5, respectively. As a splitting agent, 3 parts of benzyl alcohol was dissolved in 4 parts of ethylene glycol, and 3 parts of water was added with stirring. Water dissolves uniformly to obtain a clear solution. iii Plain woven fabrics FB-1, FB-2u Yohi FB-5 were subjected to t-B treatment using the dividing treatment agent. That is, after being immersed in a treatment agent at 20°C for 3 seconds, the treatment agent was squeezed using a fluororubber mangle so that the amount of treatment agent retained was 40 times the amount of plain fabric A (pad treatment).9. Continue to receive 50 yen of the fabric/＼
After being kept at room temperature for seconds, it was immersed in water at 60° C. for 1 minute without tension. After washing thoroughly with water at 20℃, air dry.
Weft divisibility was evaluated. The 7'c weft obtained by unwinding the obtained T fabric was observed under a microscope from the cross-sectional direction to evaluate its divisibility. The evaluation was performed using n=5 and the results are shown in Table 1.ft.

In addition, in this example and subsequent examples, the divisibility was evaluated using the following criteria. The 100% rf of the number of fine yarns actually divided with respect to the total number of components to be divided was determined. (For example, in the real Fm fall, the total number of components to be divided = 56 filaments x 5 divisions/filament = 180) ◎: r≧85 (%) ○: 85>r≧75 (%) △Near 5>r≧50 ( x: 50>r (regret) Furthermore, when the fabric FB-1 after the division treatment was dyed using the following dyeing method, the fabric was dyed in a deep and vivid color.

Dye g4 Aizen Cathilon Blue
e GLH2,5% owf (Hodogayakaji■H) Bath ratio 100 dyeing temperature required
120℃ staining time
60 minute dyeing machine Bot m rotary dyeing machine Example 2 Dimethyl (5-sodium sulfo) inphthalate 0
．． By copolymerizing polyethylene glycol with a molecular weight of 8 to 5.0 and a molecular weight of 600 with 2.0% by weight polyethylene terephthalate, six types of copolymerized polyesters P3 to P6 with different concentrations of the S component shown in Table 2 were obtained. . The intrinsic viscosity of these polyesters in O-chlorophenol is 0.6
The temperature is within the range of 4 to 0.68. These polyesters were Polyester P of Example 1. Mixed with S shown in Table 2
A mixed chip was obtained showing the average concentration of the components. Using this mixed chip and the polyamide N of Example 1, a drawn yarn of 75 denier and 56 filaments was obtained in the same manner as in Example 1.

A plain woven fabric similar to that of Example 1 was obtained using these drawn yarns as warp and weft yarns. These plain woven fabrics were treated with a treatment agent in which 20% benzyl alcohol was emulsified and dispersed in water in two widths of Sunmoor BK (manufactured by Nicca Chemical Industry ■, anionic surfactant). The treatment method was exactly the same as in Example 1 except that the emulsified dispersion was used instead of the benzyl alcohol/ethylene glycol/water solution. The resulting treated fabric was dyed in the same manner as in Example 1. Table 2 shows the results of the splitability and dyeability of the wefts taken out from the treated fabric before dyeing in the same manner as in Example 1. The dyeability was evaluated based on the dye density of the dyed fabric.

◎: Dark color, ○: Medium dark color, ×: Light color to undyed From Table 2, the concentration range of the S component of the copolymerized polyester and the 71 degree range of the S component of the mixed polyester, which is the component to be divided, are both It can be seen that fabrics using composite yarns within the scope of the present invention show good results in both splittability and dyeability.

Example 5 By changing the type of glycol component, molecular weight i, and copolymerization amount (W weight ratio), dimethyl (5-sodium sulfo) inphthalate was copolymerized with 2.0 mol of polyethylene terephthalate, and 〇-chlorophenol was used. The intrinsic viscosity of 1ff
Copolymerized polyethylene terephthalate with an i of 0.58 to 0.61 is obtained. Table 5 shows the glycol components used in the copolymerization.

These 11 types of polyesters (chips) and Example 1
Polymer Po (chip) was mixed with 'i'+ in a ratio of 80/20. At this time, the concentration of the S component in the mixed polyester was 1.6 molar. The mixed polyester obtained here is used as the component to be divided.

In addition, Example 1 using the polyamide N of Example 1 as a dividing component
A split-type composite yarn of 75 denier and 36 filaments was obtained in the same manner as described above. A plain woven fabric having the same weave density as in Example 1 was obtained using these composite yarns as the warp and weft. .

These plain woven fabrics were divided into gkS using an aqueous dispersion of benzyl alcohol in the same manner as in Example 2.

The obtained treated fabric was dyed in the same manner as in Example 1.

Furthermore, the fabric after dyeing was evaluated for discoloration and fading using a fade meter with grade 4 irradiation as B. Dividability and stainability are real r1
Evaluation was made based on the criteria of Example 1 and Example 2. Table 5 also shows the occurrence of fluff and yarn breakage in the drawing process of the composite yarn spinning process, together with the evaluation results described above.

Regarding the light resistance, a sample having excellent light resistance with no discoloration or fading as a result of the fade meter treatment was rated as 0, and a sample in which discoloration or fading was observed was graded as x.

Stretchability is indicated by "X" if fuzz or thread breakage occurred in the ring during 6 hours of stretching, and "O" if the frequency of these occurrences was very small or almost non-existent.

[Brief explanation of the drawing]

1 to 6 are examples of cross sections of splittable conjugate fibers applicable to the present invention. 7 and 8 are examples of an apparatus for manufacturing splittable composite fibers applicable to the present invention, and FIG.
This figure is a plan view taken along the X--X line diagram in FIG. 7. A composite yarn having the cross section shown in FIG. 3 is obtained from this device. Figure 9 shows the relationship between (t'3ols0) of 5-sodium sulfoisophthalic acid in the copolymerized polyester and the allowable mixing ratio C1 of the components to be divided. In Figures 1ski to Figure 8, the symbols are It is as follows: A: divided component, B: component to be divided 1: distribution plate, 2f3 and 2: discharge hole of A component in distribution plate, 5: mouthpiece plate 4: discharge hole of composite system 5: B Component inflow holes 6: r15 and 6: B component discharge holes 7 and 7: Shielding portion for B component 8: Merging portion B of A component and B component and discharge guide portion of these composite polymers

Claims (1)

[Claims] A polyester obtained by copolymerizing 1.0 to 4.0 mol % of an isophthalic acid component containing a metal sulfonate group based on the acid component and 0.2 to 7 weight % of polyalkylene glycol, and a polyester that does not contain a metal sulfonate group. and melt-mix the metal sulfonate groups to a concentration of 0.8 to
A split type composite yarn made of 3.5 mol% polyester arranged so that the polyamide component is divided within the cross section of the yarn is treated with a treatment agent containing a polyamide swelling agent to produce the split type composite yarn. A method for producing fine-grained polyester yarn with improved dyeability, characterized by dividing.