JP2003306830A - Cation-dyeable polyester thick and thin multifilament yarn and method for producing the same and woven or knitted fabric - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cation-dyeable polyester thick and thin multifilament yarn affording a splashed pattern-like appearance of a clear contrast between a deep dyed part and a light dyed part. <P>SOLUTION: The cation-dyeable polyester thick and thin multifilament yarn comprises single filaments having a plurality of thick and thin unevennesses and ≥70% of the yarn thick parts are composed of thick parts of the single filaments. Furthermore, ≥90% of the yarn thin parts are composed of thin parts of the single filaments. The ratio of thickest parts/thinnest parts of the single filaments is ≥1.3. The polyester thick and thin multifilament yarn develops a color as follows. The L value of the yarn thick parts is 22-32 and the L value of the yarn thin parts is 48-60. The difference in the L value between the yarn thick parts and the yarn thin parts is 18-30. The cation-dyeable polyester thick and thin multifilament yarn is obtained by preheating an undrawn cation-dyeable polyester yarn having 10-40×10<SP>-3</SP>Δn and 20-80 interlaced spots/m at the glass transition temperature (Tg) of the polymer ±20°C for 4.0×10<SP>-2</SP>to 4.0×10<SP>-1</SP>s, drawing the resultant preheated yarn at 0.40-0.60 of the maximum draw ratio (MDR) at 80-120°C and heat-treating the drawn yarn at a temperature not lower than the Tg of the polymer and not higher than the crystallization temperature (Tc) thereof in a relaxed state at a relaxation ratio not exceeding 0.1%. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a cationic dye which, when made into a woven or knitted fabric for clothing or interior use, has a deeply dyed portion with a sharp contrast due to the dyeing with a cationic dye and has a sharp and sharp contrast. TECHNICAL FIELD The present invention relates to a dyeable polyester thick multifilament yarn, a method for producing the dyed polyester thick multifilament yarn, and a woven or knitted fabric containing the dye-dyeable polyester thick multifilament yarn.

[0002]

2. Description of the Related Art Conventionally, as one of the means for dyeing the polyester fiber itself, there is a thick multifilament yarn obtained by semi-drawing an undrawn yarn composed of a plurality of single fibers. It is known that when a woven or knitted fabric is dyed, a marbling appearance can be obtained due to the dark and light dyeing effect, based on the thick and thick dyeing details and the light dyeing details. However, the above-mentioned thick and thin multifilament yarn has a thick portion that exhibits deep dyeing in the details showing light dyeability, and when this is used as a woven or knitted product, the details are light color dyeing properties equivalent to ordinary drawn yarns. Is not provided, and the dyeing effect of light and shade forming a sufficient contrast cannot be expressed.

In order to obtain a deep and light dyeing effect with sufficient contrast, the thick portions and details of each single fiber constituting the polyester multifilament yarn become the deep dyeing portion and the light dyeing portion of the multifilament yarn, respectively. In the multifilament yarn, it is necessary that the thick portions and details of the monofilament be present in a concentrated manner.
No. 01-64823 proposes a polyester thick and thin multifilament yarn having a contrast of dark and light by heating and stretching an undrawn polyester multifilament yarn having an entangled portion under a specific condition, but the contrast of dark and light is clear. A polyester thick multifilament yarn is desired.

[0004]

SUMMARY OF THE INVENTION In view of the above situation, the present invention uses a polyester dyeable with a cationic dye that gives a markedly sharper color than a disperse dye, and heat-stretches and relaxes it under specific conditions. This solves the problems in the prior art. The object of the present invention is that when dyed with a cationic dye, the cycle between the deep dyeing part and the light dyeing part is random, and the deep dyeing part is clear, and the contrast between the dark dyeing part and the light dyeing part is clear. To provide a polyester dye-thin polyester multi-filament yarn capable of dyeing a cationic dye, which gives a woven or knitted appearance to a woven or knitted fabric, and to obtain such a polyester multi-filament yarn dyeable with a cationic dye. An object of the present invention is to provide a woven / knitted fabric dyed with a cationic dye composed of multifilament yarn.

[0005]

The first invention of the present invention comprises a plurality of monofilaments made of a cationic dye-dyeable polyester and having thick and thin spots in the axial direction of the fiber, and satisfies the following requirements (1) to
A thick polyester multifilament yarn dyeable with a cationic dye, which satisfies (3). (1) 70% or more of the monofilaments constituting the thick part of the thick and thin multifilament yarn consist of monofilament thick parts, and 90% or more of the monofilaments constituting the details of multifilament yarn consist of monofilament details . (2) The ratio of the monofilament diameters of the thickest part and the thinnest part of the monofilament is 1.3 or more. (3) When the thick and thin multifilament yarn is dyed with a cationic dye under the conditions described below, it exhibits coloring characteristics satisfying the following (a) to (c) at the same time. (A) The color of the thick part of the thick and thin multifilament yarn is 22 or more and 32 or less in L value. (B) The color development of the fine multifilament yarn is 48 or more and 60 or less in L value. (C) The color difference between the thick portion and the small portion of the thick and thin multifilament yarn is 18 or more and 30 or less in L value. The second invention of the present invention is a non-stretched cationic dye dyeable polyester comprising a plurality of single fibers having a birefringence of 10 × 10 ⁻³ to 40 × 10 ⁻³ and having 20 to 80 entangled portions / m. A method for producing a polyester multi-filament yarn dyeable with a cationic dye, comprising treating the yarn in the following steps (a) to (c). (A) Temperature is (Tg of polyester dyeable with cationic dye)
-20 ° C)-(Tg of polyester dyeable with cationic dye)
+ 20 ° C.) and the contact time is 4.0 × 10 ⁻² to 4.0.
Step of preheating under the condition of × 10 ⁻¹ second (however, Tg represents a glass transition temperature). (B) A step of stretching under the condition that the stretching ratio is 0.40 to 0.60 times MDR and the stretching temperature is 80 to 120 ° C. (however, M
DR represents the maximum draw ratio of the undrawn yarn at a drawing temperature of 85 ° C). (C) A step of heat-treating after stretching at a temperature not lower than Tg and not higher than Tc of the cationic dye-dyeable polyester in a relaxed state where the relaxation rate does not exceed 0.1% (where Tc represents a crystallization temperature). A third invention of the present invention is a woven or knitted fabric comprising the polyester dyeable polyester thick multifilament yarn as described above.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A cationic dye-dyeable (hereinafter referred to as cationic dyeable) polyester thick multifilament yarn of the present invention is composed of a plurality of single fibers made of cationic dyeable polyester and having thick and thin spots in the axial direction. The thick part of the single fiber is concentrated in the thick part of the thick and thin multifilament yarn,
It is a thick and thin multifilament yarn in which the details of single fibers are concentrated in the details of the thick and thin multifilament yarn.

In the cationic dyeable polyester of the present invention, the main repeating unit is ethylene terephthalate.
And sodium sulfoisophthalic acid, sodium sulfonaphthalenedicarboxylic acid, and other metal salts such as a polyester copolymerized with an acid group-containing ester-forming compound such as a sulfonate group. Polyester obtained by copolymerizing ethylene terephthalate with 5-sodium sulfoisophthalic acid in an amount of 1.0 to 3.5 mol% is preferred.

When the copolymerization amount of an acid group-containing ester-forming compound such as a metal salt sulfonate group, especially 5-sodium sulfoisophthalic acid is less than 1.0 mol%, the dyeability of the cationic dye becomes insufficient and the contrast becomes poor. Easy to fall,
When it exceeds 3.5 mol%, it becomes difficult to obtain sufficient strength as a fiber for clothing.

Further, as a cationic dyeable polyester,
For the purpose of improving the dyeability with respect to the cationic dye, a polyester obtained by copolymerizing other copolymer components or blending a blend component in addition to the acid group-containing ester forming compound such as a metal salt sulfonate group may be used.

Examples of the copolymerization component include isophthalic acid, adipic acid, sebacic acid, 1,4-butanediol, cyclohexanediol, and an ethylene oxide adduct of bisphenol A. Examples of the blending component include polyalkylene glycol and alkyl. Examples thereof include sulfonic acid and inorganic substances.

In the present invention, the cationic dyeable polyester thick thin multifilament yarn is a thick thin multifilament yarn in order to have a clear contrast between the deep dyed portion and the light dyed portion when dyed with a cationic dye. It is necessary that 70% or more of the monofilaments constituting the thick part are composed of monofilament thick parts, and 90% or more of the monofilaments constituting the details of the thick thin multifilament yarn consist of monofilament details. In the thick part of the thin multifilament yarn, the thick part of the single fiber is 70
%, Or in the details of the thick and thin multifilament yarn, if the details of the single fiber are less than 90%, the contrast between the deeply dyed part and the lightly dyed part when dyed with a cationic dye will be small, and the appearance will be dull. It becomes unclear.

The thick portion of the thick and thin multifilament yarn of the present invention means a portion which, when dyed with a cationic dye, visually appears to be relatively darker in the longitudinal direction of the fiber than other portions (dark portion). The detail of the thick and thin multifilament yarn is a portion (light color portion) which is relatively clearly seen in the longitudinal direction of the fiber in comparison with other portions by the same visual observation.

Further, the single fibers constituting the cationic dyeable polyester thick and thin multifilament yarn of the present invention have thick and thin spots in which the fiber diameter ratio of the thickest portion and the thinnest portion is 1.3 or more. In the case of thick and fine spots having a fiber diameter ratio of less than 1.3, a sufficient shade effect cannot be obtained when dyed with a cationic dye.

Further, in the cationic dyeable polyester thick thin multifilament yarn of the present invention, when dyed with a cationic dye under the conditions described below, the thick color of the thick thin multifilament yarn has an L value of 22 or more and 32 or less. When the L value is less than 22, the color of the fiber for clothing is dark, but the molecular orientation is insufficient, the fiber strength is insufficient, and the L value exceeds 32. Therefore, it is impossible to obtain a sufficient contrast between the dark color portion and the light color portion.

Further, in the cationic dyeable polyester thick and thin multifilament yarn of the present invention, when the dyeing is performed under the same conditions, the fine color development of the thick and thin multifilament yarn is 4 in L value.
It is necessary to be 8 or more and 60 or less, and when the L value is less than 48, the color difference with the dark color portion becomes insufficient, and sufficient contrast cannot be obtained between the dark color portion and the light color portion. When the value exceeds 60, the color as a fiber for clothing becomes insufficient.

Further, in the cationic dyeable polyester thick and thin multifilament yarn of the present invention, the difference in color development between the thick portion and the detail of the thick and thin multifilament yarn is 18 or more and 30 or less when dyed under the same conditions. If the color difference is less than 18 in the L value, sufficient contrast cannot be obtained between the dark color portion and the light color portion, and if the L value exceeds 30 in the dark color portion and the light color portion. Although the contrast between them is sufficient, if such a color difference occurs, there is a concern that the strength of the fiber for clothing will be insufficient and fuzz or the like will occur.

The L value of the color development of the thick portion and the detail of the cationic dyeable polyester thick and thin multifilament yarn in the present invention is measured by dyeing with a cationic dye under the following conditions. Cation dyeable polyester thick multifilament yarn is used as a cationic dye, Eisencatillon marine blue GRLH 200% (Hodogaya Chemical Co., Ltd.) 1
% Owf (vs. fiber weight), acetic acid 0.5 g / l, sodium acetate 0.5 g / l, glauber's salt 1.0 g / l, bath ratio 1:30, temperature 100 ° C., condition for 30 minutes The dyed yarn is dyed with hydrosulfate 1 g / l, soda ash 1 g /
1, Score roll FC-300 (surfactant manufactured by Kao Co., Ltd.) 0.5 g / l, a bath ratio of 1:30, reduction washing at 80 ° C. for 20 minutes, washing with water, and drying to measure color development characteristics. Use as dyed yarn.

The L value representing the color development is a lightness index in the Hunter color difference formula. The larger the L value, the lighter the color, and the smaller the L value, the darker the color. The L value was measured with a color-difference meter CR-241 (manufactured by Minolta Co., Ltd.) using a pulse xenon lamp as a light source, and a standard light C
(JIS Z8720) and the measurement hole diameter was 0.3 mm. The color difference between the thick portion and the fine portion of the cationic dyeable polyester thick and thin multifilament yarn is determined by the following formula. Color difference between thick part and detail = L value of detail-L value of thick part

When the thick portion of the thick multifilament yarn has an L value of less than 22, it becomes a dark color, but the molecular strength in the thick portion is insufficient, so that the fiber strength becomes insufficient and L
When the value exceeds 32, the difference from the L value of the thin portion is small, the color difference with the thin portion becomes insufficient, and clear contrast can be obtained between the dark color portion of the thick portion and the light color portion of the thin portion. I can't.

When the color of the thin portion of the thick and thin multifilament yarn has an L value of less than 48, the difference between the thick portion and L is small and the color difference with the thick portion is insufficient, resulting in a dark portion due to the thick portion. A clear contrast cannot be obtained between the light-colored portions due to the thin portions, and when the L value exceeds 60, the color as a fiber for clothing becomes insufficient.

In the present invention, the monofilaments constituting the cationic dyeable polyester thick and thin multifilament yarn may have a cross-sectional shape of either a circular cross section or an atypical cross section such as triangular, multilobal or flat. It is not limited.

The cationic dyeable polyester thick multifilament yarn of the present invention has a clear contrast between the deep dyed portion and the light dyed portion of the thick and thin multifilament yarn when dyed with a cationic dye as a woven or knitted fabric. The contrast between the deep dyed part and the light dyed part is made much clearer as compared with the conventional one using polyester thick multifilament yarn dyeable with a disperse dye.

The cationic dyeable polyester thick and thin fabric of the present invention
The ruti filament yarn can be manufactured by the following method.
That is, the birefringence is 10 × 10^-3~ 40 × 10^-3so,
And from a plurality of single fibers having 20 to 80 entangled parts / m
The cation dyeable polyester undrawn yarn
A cationic dyeable polyis obtained by treating with (a) to (c).
It is possible to manufacture ester thick multifilament yarn
Wear. (A) The temperature is (Cg dyeable polyester Tg-20
° C) ~ (Tg of cationic dyeable polyester + 20 ° C),
And the contact time is 4.0 × 10^-2~ 4.0 x 10 ^-1Second
The process of preheating under the conditions. (B) Stretching ratio is 0.40 to 0.60 times MDR, stretching
A step of stretching at a temperature of 80 to 120 ° C. (C) In a relaxed state where the relaxation rate does not exceed 0.1% after stretching
And above Tg of polyester dyeable with cationic dye
Process of heat treatment at temperature.

Constituting a cationic dyeable polyester undrawn yarn
The birefringence of a single fiber is 10 × 10 ^-3Less than a single filament
Cationic dyeable thickness formed from thick part which is unstretched part of fiber
The thin multifilament yarn has a low strength in the thick part,
When used as a fiber, it causes fluff, so it is practical
And the birefringence of single fiber is 40 × 10^-3To
If exceeded, MDR of cationic dyeable polyester undrawn yarn
Makes the stretched monofilaments thick and thin due to the small size
The draw ratio at that time becomes low, and the resulting thick and thin multi-filament
The difference in fineness between the thick and fine parts of the
The difference in shade when dyed becomes smaller, and the desired control
It is not possible to get a clear appearance of the last.

The cationic dyeable polyester undrawn yarn in the method of the present invention needs to have 20 to 80 entangled portions / m, and if the entangled portion is less than 20 entangles / m, the obtained thick and thin multifilament yarn is obtained. The difference in fineness between the thick part and the fine part is small, the thick part showing the deep dyeing property is long, the appearance of clear contrast cannot be obtained, and when the entangled part exceeds 80 / m,
Although the frequency of occurrence of the dark-dyeing portion and the light-dyeing portion is high, the overall light-and-deep contrast is lowered, and the desired appearance cannot be obtained with a marbling tone rather than a dull tone.

The entangled portion may be added to the unstretched yarn of the cationic dyeable polyester in the spinning step or immediately before the stretching step. Also, the method of adding the confounding part,
The method is not particularly limited, and a confounding method such as a fluid treatment with a gas or a fluid treatment with a liquid may be used, but any method may be used.

Further, in the method of the present invention, in order to generate thick and thin spots on the single fiber and to form a portion where the thick portion of the single fiber is concentrated and a portion where the details of the single fiber are concentrated, a cationic dyeable material having an entangled portion is formed. The undrawn polyester yarn has a (a) temperature (Tg of cationic dyeable polyester: 20 ° C.) to (Tg of cationic dyeable polyester: 20 ° C.) and a contact time of 4.0 × 10 ⁻² to 4.0 × 10. ^-1 second preheating step, (b) stretch ratio is MDR 0.40 to 0.6
A step of stretching at 0 times and a stretching temperature of 80 to 120 ° C., (c) after stretching, in a relaxed state where the relaxation rate does not exceed 0.1%, at a temperature of Tg or more and Tc or less of the cationic dye-dyeable polyester. It is necessary to sequentially process the heat treatment steps.

When the temperature in the step (a) of preheating is less than Tg-20 ° C. of the cationic dyeable polyester, sufficient preheating is not performed, so that the development of thick and thin spots due to stretching is weakened, and the cationic dyeable polyester. When Tg + 20 ° C. is exceeded, the frictional resistance increases and the stretching becomes unstable. In addition, when the contact time is less than 4.0 × 10 ⁻² seconds, sufficient preheating is not performed, so that thick and thin spots are less likely to appear during stretching, and clear contrast when dyed with a cationic dye cannot be obtained.
When the contact time exceeds 4.0 × 10 ⁻¹ second, the ratio of the thick portion that becomes the deeply dyed portion when dyed with the cationic dye becomes high.

As the stretching means in the stretching step (b), either a heated friction resistance pin or a heating roller may be used. Stretching ratio in stretching is 0.4 of MDR
When the ratio is less than 5 times, the ratio of the thick part which becomes a deeply dyed part when dyed with a cationic dye becomes high, and when the stretching ratio exceeds 0.60 times the MDR, the ratio of the thick part becomes small. It becomes difficult to obtain an appearance with clear contrast. Further, if the stretching temperature is lower than 80 ° C, the ratio of the thick part becomes high, and if the stretching temperature exceeds 120 ° C, the ratio of the thick part becomes low, and the desired appearance with clear contrast can be obtained. become unable.

Further, in the step (c), the T of the polyester dyeable with a cationic dye is used in a relaxation state where the relaxation rate does not exceed 0.1%.
Heat treatment is performed at a temperature of g or more and a crystallization temperature or less. Relaxation rate is 0
When the tension is less than 10%, when the obtained cationic dyeable polyester thick multifilament yarn is dyed with a cationic dye as a woven or knitted product, the contrast between the dark color part and the light color part becomes small, and the relaxation rate is 0.1. If it exceeds%, (c)
In this process, the tension during running of the yarn is reduced and the workability is deteriorated.
When the temperature is lower than Tg, sufficient relaxation effect cannot be obtained, and when dyed, sufficient contrast cannot be obtained between the dark color portion and the light color portion. When the temperature exceeds Tc, yarn breakage occurs,
Poor yarn formability.

The glass transition temperature Tg and crystallization temperature Tc in the method of the present invention are 290 for the polyester polymer.
After the temperature was raised to 0 ° C to perform melt quenching, the glass transition temperature and the crystallization temperature determined by the DSC method (differential scanning calorimetry, temperature rising rate 10 ° C / min) were used.

The cationic dyeable polyester thick and thin multifilament yarn of the present invention is preferably used as a material for woven and knitted materials. The cationic dyeable polyester thick and thin multifilament yarn is used alone or in combination with other filament yarns to form a woven or knitted fabric. After that, it can be dyed with a cationic dye in an arbitrary concentration and hue by a conventional method. When the filament yarn is combined with other filament yarn, a ply twist, a mixed fiber entanglement treatment with a fluid, or the like is optionally used. In addition, a known cationic dye is used for dyeing with a cationic dye,
For the purpose of dyeing other multifilament yarns, dyes that can be dyed by other multifilaments can be used in the same bath or a separate bath. As the dyeing method, any conventionally known dyeing method may be used.

A woven or knitted fabric containing the cationic dyeable polyester thick thin multifilament yarn, which is dyed with a cationic dye, has a deep dyed portion on the light dyeing area of the cationic dyeable polyester thick thin multifilament yarn. Is a short and clear appearance, and the contrast between the deeply dyed part and the lightly dyed part has a clear appearance.

[0034]

EXAMPLES The present invention will be specifically described below with reference to examples. In the examples, measurement and determination of each characteristic value was based on the following method.

(Birefringent) Polyester unstretched yarn is manufactured by Kanebo Engineering Co., Ltd. Molecular orientation measuring device DE
It measured using LTA-N and made the average value of 10 points the birefringence.

(Number of entangled parts) The polyester undrawn yarn was floated on a water bath to open the multifilaments, and the number of entangled parts at a sample length of 1 m was visually measured, and the average value of 5 measurements was taken as the number of entangled parts. .

(Thickness (Detail) Ratio of Single Fiber in Thickness (Detail) of Thick Multifilament Yarn) The thick multifilament yarn of the present invention is used as the weft in WJL, and 55d is used as the warp.
Using tex / 18f polyester multifilament yarn, warp density 59 threads / cm, weft density (threads / cm) =
279 / √ (Fineness (dte
x)), a plain woven fabric was prepared and dyed with a cationic dye under the following conditions.

Eisen Catillon Marine Blue GR
Using LH 200% (cationic dye manufactured by Hodogaya Chemical Co., Ltd.), dye 1% owf, acetic acid 0.5 g / l, sodium acetate 0.5 g / l, glauber's salt 1.0 g / l, bath ratio 1: Three
Dyeing was carried out under conditions of 0, dyeing temperature 120 ° C., and dyeing time 30 minutes. After dyeing, the thick multifilament yarn is removed and the cross section of the thick dyed portion, which is the thick portion of the thick multifilament yarn, and the light dyed portion, which is the detail of the thick multifilament yarn,
Kanebo Engineering Co., Ltd. molecular orientation measuring device DELTA-N was used to measure the fiber diameter of each single fiber,
Composition of thick multi-filament yarn in the thick part (detail) Count how many mono-filaments in the single fiber have the thick part (detail). The ratio (%) and the ratio (%) of the details of the single fiber in the details of the thick and thin multifilament yarn were obtained. A portion having a fineness twice or more as compared with the thinnest portion (detail) of the single fiber was defined as a thick portion of the single fiber.

(Ratio of Single Fiber Diameter) The weft yarn was drawn out from the dyed woven fabric prepared for measuring the composition ratio of the thick and thin multifilament yarns, and the single fibers of the deep dyeing part and the light dyeing part were randomly selected. The fiber diameters at 100 points were measured using a molecular orientation measuring device DELTA-N manufactured by Kanebo Engineering Co., Ltd., respectively. The ratio of the diameter of the thickest part to the diameter of the thinnest part was defined as the ratio of the single fiber diameter.

(Appearance of woven fabric) The slab-like thick and thin appearance effect of the sample plain woven fabric dyed with the cationic dye was visually evaluated. ◯: The contrast of light and shade is clear and the slab-like appearance effect is very good. Δ: The light and shade contrast is clear, and the slab-like appearance effect is good. X: The contrast of gradation is not clear and the slab-like appearance effect is insufficient.

Example 1 Incorporation of 5-sodium sulfoisophthalic acid in an amount of 1.65 mol% by mass, intrinsic viscosity 0.58, density 1.38 g / cm ³ , melting point 251 ° C., T
A cationic dye-dyeable polyethylene terephthalate having a g of 76 ° C. is discharged from a spinneret having 12 spinning holes of 0.25 mm in diameter at an output of 11.59 g / min and a spinning temperature of 280 ° C.
Melt spinning at 1400 m after applying an oil agent and then taking it off at a speed of 1414 m / min, followed by an air entanglement treatment between a pair of rollers at an air pressure of 400 kPa.
Winding in / min, 82.8 decitex (dtex) /
An undrawn yarn of 12 filaments (f) was obtained.

The undrawn yarn thus obtained has a birefringence of 13 × 1.
0 ^-3, MDR is at 3.74, it had a confounding portion 45 Ke / m. The unstretched yarn was heated and stretched under the conditions shown in Table 1 to obtain a 55.0 dtex / 12f cationic dye-dyeable polyester thick multifilament yarn. The evaluation results of the obtained thick and thin multifilament yarns are shown in Table 1. The woven fabric dyed with the cationic dye comprising the obtained polyester thick and thin multifilament yarns has a clear contrast between the deep dyed part and the light dyed part. It had a good slab-like appearance.

(Example 2) Using the same unstretched yarn as obtained in Example 1, it was stretched under the conditions shown in Table 1 to obtain a cationic dye-dyeable polyester thick multifilament yarn.
Table 1 shows the evaluation results of the obtained thick and thin multifilament yarns. The woven fabric obtained by dyeing with the cationic dye comprising the polyester thick and thin multifilament yarn had a clear contrast between the deep dyed part and the lightly dyed part, and had a good slab-like appearance.

(Example 3) In Example 1, spinning was performed under the same conditions as in Example 1 except that the spinning discharge amount was changed, and the spinning was performed under the conditions shown in Table 1 to obtain a cationic dye-dyeable polyester thick thin mulch. A filament yarn was obtained. Table 1 shows the evaluation results of the obtained thick and thin multifilament yarns. The woven fabric obtained by dyeing with the cationic dye comprising the polyester thick and thin multifilament yarn had a large contrast between the deep dyed part and the lightly dyed part, and exhibited a good slab-like appearance.

(Comparative Examples 1 to 3) Using the same undrawn yarn as that obtained in Example 1, it was drawn under the conditions shown in Table 1 to obtain a thick and thin multifilament yarn. Table 1 shows the evaluation results of the obtained thick and thin multifilament yarns. In Comparative Example 1, since there is no preheating step before stretching, the resulting monofilament of the thin multifilament yarn has small thick spots, does not have the large details defined in the present invention, and is dyed with a cationic dye. The difference in lightness and darkness became small, and the desired clear appearance of contrast was not obtained. In Comparative Example 2, since the relaxation rate after stretching is minus (stretching), the thick and thin unevenness of the constituent single fibers of the obtained thick and thin multifilament yarn is small, the thick details defined in the present invention do not exist, and the cation No clear contrast appearance was obtained when dyed. In Comparative Example 3, since the relaxation rate after stretching was too large, the yarn was wound around the roller and the spinnability was poor.

[0046]

[Table 1]

[0047]

The cationic dyeable polyester thick and thin multifilament yarn of the present invention is a thick and thin multifilament yarn in which the contrast between the deep dyed part and the light dyed part is clear when dyed with a cationic dye. When a woven or knitted fabric is formed from the thick and thin multifilament yarns and dyed with a cationic dye, a clear dark and light contrast appearance in which a short deeply dyed portion is clearly present on the lightly dyed region is obtained. Further, according to the method for producing a cationic dyeable polyester thick multifilament yarn of the present invention, the unstretched yarn is imparted with an entangled portion by fluid treatment, and subjected to thick mottled stretching and then subjected to relaxation heat treatment to thicken the monofilament. It is possible to stably obtain thick and thin multifilament yarns in which the contrast between the deep dyed part and the lightly dyed part is clear, and the woven or knitted fabric of the present invention is dyed with a cationic dye. In addition, the woven and knitted fabric has a casual appearance in which the deeply dyed portion is emphasized in a slab tone on the woven and knitted fabric, and is suitable for clothing.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Norikawa Kawashima             2-3, Ushikawadori 4-chome, Toyohashi City, Aichi Prefecture             Ryo Rayon Co., Ltd. Toyohashi Office (72) Inventor Hideo Sakakura             2-3, Ushikawadori 4-chome, Toyohashi City, Aichi Prefecture             Ryo Rayon Co., Ltd. Toyohashi Office (72) Inventor Kazuhiro Shiozaki             2-3, Ushikawadori 4-chome, Toyohashi City, Aichi Prefecture             Ryo Rayon Co., Ltd. Toyohashi Office F-term (reference) 4L035 BB31 BB40 BB78 BB84 BB89                       BB91 DD12 DD20                 4L036 MA05 PA03                 4L048 AA20 AA36 AB07 AB11 AC07                       DA01 DA19

Claims (4)

[Claims] 1. A plurality of monofilaments comprising a cationic dye-dyeable polyester and having thick and thin spots in the axial direction of the fiber,
A thick polyester multifilament yarn dyeable with a cationic dye, which satisfies the following requirements (1) to (3). (1) 70% or more of the monofilaments constituting the thick part of the thick and thin multifilament yarn consist of monofilament thick parts, and 90% or more of the monofilaments constituting the details of multifilament yarn consist of monofilament details . (2) The ratio of the monofilament diameters of the thickest part and the thinnest part of the monofilament is 1.3 or more. (3) When the thick and thin multifilament yarn is dyed with a cationic dye under the conditions described below, it exhibits coloring characteristics satisfying the following (a) to (c) at the same time. (A) The color of the thick part of the thick and thin multifilament yarn is 22 or more and 32 or less in L value. (B) The color development of the fine multifilament yarn is 48 or more and 60 or less in L value. (C) The color difference between the thick portion and the small portion of the thick and thin multifilament yarn is 18 or more and 30 or less in L value. 2. A cationic dye-dyeable polyester, wherein the main repeating unit is ethylene terephthalate,
-The polyester multi-filament yarn dyeable with a cationic dye according to claim 1, which is a polyester copolymerized with 1.0 to 3.5 mol% of sodium sulfoisophthalic acid. 3. The birefringence is 10 × 10 ⁻³ to 40 × 10.
^-3 and a cationic dye-dyeable polyester undrawn yarn consisting of a plurality of single fibers having 20 to 80 entangled parts / m, are treated in the following steps (a) to (c). Dye-dyeable polyester thick multifilament yarn manufacturing method. (A) Temperature is (Tg of polyester dyeable with cationic dye)
-20 ° C)-(Tg of polyester dyeable with cationic dye)
+ 20 ° C.) and the contact time is 4.0 × 10 ⁻² to 4.0.
Step of preheating under the condition of × 10 ⁻¹ second (however, Tg represents a glass transition temperature). (B) A step of stretching under the condition that the stretching ratio is 0.40 to 0.60 times MDR and the stretching temperature is 80 to 120 ° C. (however, M
DR represents the maximum draw ratio of the undrawn yarn at a drawing temperature of 85 ° C). (C) A step of heat-treating after stretching at a temperature not lower than Tg and not higher than the crystallization temperature of the cationic dye-dyeable polyester in a relaxed state where the relaxation rate does not exceed 0.1%. 4. A woven or knit fabric comprising the cationic dye-dyeable polyester thick multifilament yarn according to claim 1 or 2.