JP6858686B2 - Highly shrinkable atmospheric pressure cation dyeable polyester fiber, mixed yarn using it, and fabric using them - Google Patents

Description

The present invention relates to a highly shrinkable normal pressure cation dyeable polyester fiber, a mixed fiber yarn using the polyester fiber, and a fabric using the same.

Polyester fibers are widely used in clothing applications due to their excellent mechanical and chemical properties.
However, it is difficult to obtain a clear and deep color unless the polyester fiber is dyed at a high temperature and high pressure of 130 ° C. using a disperse dye or a cationic dye.
Therefore, when polyester fibers are combined with other non-polyester fibers such as polyamide fibers, polyurethane fibers, and acrylic fibers and interwoven or interwoven, the combined fibers are deteriorated under high temperature and high pressure, which is a polyester dyeing environment. ..

In order to overcome the above problems, polyester fibers that can be dyed under normal pressure at 100 ° C. have been developed. Specifically, normal pressure cations capable of dyeing with a cationic dye are possible by copolymerizing polyester with a dicarboxylic acid having a metal sulfonic acid base such as 5-sodium sulfoisophthalic acid and a polyalkylene glycol such as polyethylene glycol. It is a dyeable polyester fiber.

Further, the atmospheric pressure cationic dyeable polyester fiber is excellent in color development and fastness as compared with the disperse dye because the introduced sulfonic acid group and the cationic dye are ionic bonded.
Further, when a normal pressure cation dyeable polyester fiber and another fiber having different color development properties are combined to form a cloth, a cloth having excellent design can be obtained because it exhibits a heather tone.

From the above, fabrics using atmospheric pressure cation dyeable polyester fibers can be effectively used for clothing applications.

Further, in clothing applications, fluffy texture is required in addition to excellent appearance.
A fabric having fluff can be obtained by interlacing and knitting two or more kinds of fibers having different hot water shrinkage rates and shrinking the interwoven fabric with hot water. When the above-mentioned fabric is shrunk with hot water, the fibers having a high hot water shrinkage rate are greatly shrunk, so that the fiber length is shortened, and the fibers having a small hot water shrinkage rate are raised on the surface of the cloth to develop fluff.

As an example of a woven fabric having fluff, a fabric using a mixed yarn of a normal pressure cation dyeable polyester fiber and a polyamide fiber having a hot water shrinkage rate of 20% or more is known (Patent Document 1). Since the normal pressure cationic dyeable polyester fiber is used, it can be dyed without deteriorating the polyamide fiber, and the hot water shrinkage rate of the normal pressure cationic dyeable polyester fiber is 20% or more. Therefore, it is disclosed that the polyamide fibers emerge on the surface due to hot water shrinkage during dyeing and fluffy appearance occurs.

Japanese Unexamined Patent Publication No. 6-299428

However, although the hot water shrinkage rate of the atmospheric pressure cationic dyeable polyester fiber specifically described in Patent Document 1 is about 30%, the fluffiness of the cloth obtained by using this is sufficient. It turned out not.

Therefore, an object of the present invention is to provide a highly shrinkable normal pressure cation dyeable polyester fiber capable of obtaining a fabric having good color development, high fastness, and good fluffiness.
Another object of the present invention is to provide a mixed yarn capable of obtaining a fabric having good color development, high fastness, and good fluffiness.
Another object of the present invention is to provide a fabric having good color development, high fastness, and good fluffiness.

As a result of diligent studies, the present inventors have made a resin obtained by mixing a spiroglycol copolymerized polyester with a normal pressure cationic dyeable polyester resin having a specific resin composition ratio at a specific mixing ratio (mass ratio), and heat. The present invention has been completed by finding that a highly shrinkable normal pressure cationic dyeable polyester fiber having a water shrinkage rate of 40% or more can obtain a cloth having excellent color development and sufficient fluffiness. That is, in order to achieve the above object, the present invention adopts the following configuration.
(1) The main repeating unit is ethylene terephthalate, which contains 2.0 to 3.0 mol% of a metal sulfonate group-containing isophthalic acid component with respect to the acid component of polyester A, and is a polyalkylene having an average molecular weight of 150 to 400. Polyester A containing glycol in a proportion of 2.0 to 3.5% by mass with respect to polyester A, and polyester terephthalate as the main repeating unit, and 15 to 35 mol% of spiroglycol with respect to the glycol component of polyester B. A highly shrinkable polyester fiber comprising a resin having a mixing ratio (mass ratio) of 80:20 to 95: 5 with polyester B containing the above, and having a hot water shrinkage rate of 40% or more.

(2) The highly shrinkable normal pressure cation dyeable polyester fiber according to (1) above, which has a breaking strength of 2.0 cN / dtex or more.

(3) A mixed fiber yarn using the highly shrinkable normal pressure cation dyeable polyester fiber according to the above (1) or (2).

(4) A mixed fiber yarn using the highly shrinkable normal pressure cation dyeable polyester fiber and the polyamide fiber according to the above (1) or (2).

(5) A fabric using the highly shrinkable normal pressure cation dyeable polyester fiber according to (1) or (2) above.

(6) A fabric using the mixed yarn according to (3) or (4) above.

According to the present invention, it is possible to obtain a highly shrinkable normal pressure cation dyeable polyester fiber for obtaining a fabric having good color development, high fastness, and fluffiness.
In addition, it is possible to obtain a mixed yarn for obtaining a fabric having good color development, high fastness, and fluffiness.
In addition, it is possible to obtain a fabric having good color development, high fastness, and fluffiness.

The main repeating unit of the polyester in the present invention is ethylene terephthalate.

The amount of the metal sulfonate group-containing isophthalic acid (hereinafter referred to as SIP) component in the present invention is 2.0 to 3.0 mol% with respect to the acid component of polyester A. When the SIP component is 2.0 mol% or more, sufficient atmospheric pressure cation dyeability can be obtained, and fibers having a high hot water shrinkage rate can be obtained. Further, when the SIP component is 3.0 mol% or less, the viscosity of the SIP component does not increase due to the ion-bonding intermolecular force and gel does not occur, and the spinning operability is good.

Examples of the SIP component in the present invention include dimethyl 5-metal sulfoisophthalate (hereinafter referred to as SIPM) or a compound in which a dimethyl group is transesterified with ethylene glycol (hereinafter referred to as SIPE). SIPE is preferable because if a large amount of SIPM is added, the physical characteristics of the slurry may be deteriorated. Moreover, as a metal of the SIP component, sodium, potassium, lithium and the like can be mentioned. Most preferred is sodium.

The polyalkylene glycol (hereinafter referred to as PAG) in the present invention has an average molecular weight of 150 to 400. When the average molecular weight is 150 or more, hydrolysis is unlikely to occur during melt spinning, and the melting point and the glass transition point do not decrease, so that it is possible to prevent the fusion of polyester pellets and the generation of white powder in the false twisting process. In addition, fibers having a high hot water shrinkage rate can be obtained. When the average molecular weight is 400 or less, the fastness is excellent.

PAG in the present invention have the general formula _{HO (C n H 2n O)} m H ( where, n, m is a positive integer) one represented by, n = 2 of polyethylene glycol (hereinafter, referred to as PEG) is General purpose and preferred.

The PAG in the present invention may be contained in the polyester A in the form of copolymerization or mixing, but it is preferably copolymerized from the viewpoint of stability in the post-processing step.

The content of PAG in the present invention needs to be 2.0 to 3.5% by mass with respect to polyester A, and more preferably 2.5 to 3.0% by mass. When the content is 2.0% by mass or more, the normal pressure cation dyeability is sufficient, thickening and gelation due to the charge of the SIP component can be suppressed, and the spinning operability is good. .. In addition, the desired high shrinkage can be obtained. When the content is less than 3.5% by mass, the heat resistance of the polyester does not decrease and the color tone of the polyester is good. In addition, since the glass transition point is unlikely to decrease, fusion between polyester pellets is unlikely to occur. Moreover, when it is made into a cloth, good fluffiness is expressed.

The intrinsic viscosity of the polyester A in the present invention is not particularly limited, and may be the same as the intrinsic viscosity used for ordinary polyester fibers, and from the viewpoint of spinning operability and mechanical strength, 0.4 to 1. It is preferably 5 dl / g.

The amount of spiroglycol (hereinafter referred to as SPG) in the present invention is 15 to 35 mol% with respect to the glycol component of polyester B. Of these, 20 to 30 mol% is preferable. If the content is 15 mol% or more, a sufficient hot water shrinkage rate can be exhibited, and if it is 35 mol% or less, the fastness and breaking strength are unlikely to decrease, and the spinning operability is also good.

The SPG in the present invention may be contained in the polyester B in the form of copolymerization, mixing, etc., but is preferably copolymerized from the viewpoint of stability in the post-processing step.

The intrinsic viscosity of polyester B in the present invention is not particularly limited and may be the same as the intrinsic viscosity used for ordinary polyester fibers, and from the viewpoint of spinning operability and mechanical strength when mixed with polyester A. , 0.4 to 1.5 dl / g is preferable.

The polyester A and the polyester B may be produced or may use various commercially available raw materials. Examples of the commercially available polyester B include a trade name: "ALTESTER" (manufactured by Mitsubishi Gas Chemical Company, Inc.).

The mixing ratio (mass ratio) of polyester A and polyester B in the present invention is 80:20 to 95: 5. More preferably, it is 85: 15 to 90:10. When the mixing ratio (mass ratio) is 80:20 to 95: 5, fibers having good color development, high fastness, and high hot water shrinkage can be obtained, the breaking strength is hard to decrease, and the spinning operation is performed. The sex is also good.

To the polyester obtained by mixing the polyester A and the polyester B in the present invention, modifiers such as a light resistant agent, a heat resistant agent, and a matting agent may be added for the purpose of improving various physical characteristics.

The highly shrinkable normal pressure cation dyeable polyester fiber of the present invention is made of a polyester obtained by mixing polyester A and polyester B. Usually, in order to increase the hot water shrinkage rate of atmospheric pressure cation dyeable polyester fiber, it is mentioned as a means to increase the molecular weight and content of PAG, but if the molecular weight and content of PAG are increased, it is robust. The degree and breaking strength tend to decrease. On the other hand, in the present invention, by mixing polyester B containing SPG, a high hydrothermal shrinkage rate can be developed without increasing the molecular weight and content of PAG, and the molecular weight of PAG and the molecular weight of PAG can be increased. The fastness and breaking strength are not lowered by increasing the content.

The hot water shrinkage rate of the highly shrinkable normal pressure cation dyeable polyester fiber of the present invention needs to be 40% or more. When the hot water shrinkage rate is 40% or more, when the fabric is combined with other fibers, good fluffiness is developed due to the difference in the hot water shrinkage rate with the combined fibers.

The total fineness of the highly shrinkable normal pressure cation dyeable polyester fiber of the present invention is preferably 1 to 100 dtex. When the total fineness is 1 to 100 dtex, a good texture is maintained mainly when used for clothing.

The single yarn fineness of the highly shrinkable normal pressure cation dyeable polyester fiber of the present invention is preferably 0.5 to 20 dtex. When the single yarn fineness is 0.5 to 20 dtex, a good texture is maintained mainly when used for clothing.

The breaking strength of the highly shrinkable normal pressure cation dyeable polyester fiber of the present invention is preferably 2.0 cN / dtex or more. When the breaking strength is 2.0 cN / dtex or more, the spinning operability and the process passability of the knitting and weaving process are good, and the fabric is maintained at a sufficient strength. Further, when the breaking strength is 2.0 cN / dtex or more, it has sufficient heat shrinkage stress, and when it is combined with other fibers to form a fabric, the highly shrinkable normal pressure cationic dyeable polyester fiber shrinks sufficiently. Because it can be used, it develops good fluffy texture.

The breaking elongation of the highly shrinkable normal pressure cation dyeable polyester fiber of the present invention is preferably 30% or more. When the elongation at break is 30% or more, the spinning operability and the process passability of the knitting and weaving process are good.

The fiber cross-sectional shape of the highly shrinkable atmospheric pressure cation dyeable polyester fiber of the present invention may be a circular shape, an elliptical shape, or a modified cross section. For example, the irregular cross section includes a multi-leaf shape, a triangular shape, a flat shape, and the like.

Examples of the method for producing the highly shrinkable normal pressure cation dyeable polyester fiber of the present invention include the combe method, the POY method, and the SPD method. From the viewpoint of labor saving and productivity, the SPD method can be adopted. preferable.

In the present invention, when spinning by the SPD method, the spinning temperature is preferably 270 to 300 ° C.

In the present invention, when spinning by the SPD method, stretching is performed between the first godet roller (GR1) and the second godet roller (GR2) so that the draw ratio becomes 1.5 to 4.0 times. It is preferable to increase the peripheral speed of GR2. When the draw ratio is 1.5 times or more, the breaking strength of the fiber is high. Further, when the draw ratio is 4.0 times or less, fibers having a high hot water shrinkage rate can be obtained.

In the present invention, when spinning by the SPD method, the temperature of GR1 is preferably 70 to 90 ° C. When the temperature of GR1 is 70 ° C. or higher, the spinning operability is good, and the breaking strength and breaking elongation of the fiber are high. Further, if the temperature is 90 ° C. or lower, fibers having a high hot water shrinkage rate can be obtained. Moreover, it is preferable that the temperature is equal to or lower than the temperature of GR2.

The temperature of GR2 in the present invention is preferably 70 to 120 ° C. When the temperature of GR2 is 70 ° C. or higher, the spinning operability is good, and the breaking strength and breaking elongation of the fiber are high. Further, if the temperature is 120 ° C. or lower, fibers having a high hot water shrinkage rate can be obtained. Moreover, it is preferable that the temperature is equal to or higher than the temperature of GR1.

The mixed fiber yarn of the present invention is preferably a combination of the above-mentioned highly shrinkable atmospheric pressure cation dyeable polyester fiber and a fiber having different color development and a low hot water shrinkage rate. By combining with fibers having different color development and low hot water shrinkage rate, a heather tone is exhibited when the fabric is used, and good fluffiness is expressed.
Examples of such fibers include polyamide fibers, polyurethane fibers, acrylic fibers and the like. The hot water shrinkage rate of the fibers to be combined is preferably 15% or less. If the hot water shrinkage rate of the fibers to be combined is 15% or less, fluffiness is likely to occur when the fabric is used. More preferably, it is 10% or less.
Above all, when combined with polyamide fiber, the color development property is different, and when it is used as a cloth, it exhibits a heather tone and is excellent in design. In addition, it has a soft texture and elasticity, and is less likely to wrinkle, so it is suitable when used for clothing.

Further, it is preferable to combine it with a fiber that has been false-twisted and has a different color-developing property and a low hot water shrinkage rate. If the fibers to be combined are false twisted yarns, the fluffiness of the obtained fabric will increase.

In the mixed fiber yarn of the present invention, the mixed fiber ratio of the highly shrinkable normal pressure cation dyeable polyester fiber and the fiber having different color development and low hot water shrinkage rate is 10:90 to 90:10. It is preferably 20:80 to 40:60, and more preferably 20:80 to 40:60. In the region where the fiber mixing ratio of the highly shrinkable normal pressure cation dyeable polyester fiber and the fiber having a different color development property and a low hot water shrinkage rate is 10:90 to 90:10, a fabric having an excellent fluffy feeling can be obtained. Can be done.

The hot water shrinkage rate of the mixed fiber yarn is preferably 40% or more. When the hot water shrinkage rate of the mixed fiber yarn is 40 % or more, good fluffiness is developed when the fabric is used.

The mixed fiber yarn of the present invention can be obtained by a known mixed fiber method such as air mixed fiber, combined twist, and composite false twist. Air blending is preferable because it is easy to control the blending and the productivity is good. The air mixed fiber is performed by, for example, interlacing processing, Taslan processing, processing by a swirling airflow, or the like.

For the fabric of the present invention, it is preferable to use the above-mentioned mixed yarn.
In this case, it is preferable to use only the mixed fiber yarn as a cloth from the viewpoint of expressing good fluffiness, but other fibers may be used as long as the object of the present invention is satisfied.

The fabric of the present invention may be a woven fabric or a knitted fabric, and may be appropriately set according to the intended purpose. Examples of the structure of the woven and knitted fabric include a plain weave, a twill structure, and a Zhu Xi structure for woven fabrics. Examples of knitted fabrics include a circular knitted fabric, an interlocked organization, a warp knitted fabric half organization, a satin organization, and a jacquard organization. These may be appropriately set according to the purpose.
The fabric of the present invention can be obtained by a known weaving method or knitting method.

Further, the fabric of the present invention may be a fabric in which the above-mentioned high shrinkage normal pressure cation dyeable polyester fiber is used alone and combined with a fiber having a different color development property and a low hot water shrinkage rate.
Examples of the fiber to be combined include polyamide fiber, polyurethane fiber, acrylic fiber and the like, as in the case of the fiber to be combined when forming a mixed fiber, and polyamide fiber is preferable.
The hot water shrinkage rate of the fibers to be combined is preferably 15% or less. If the hot water shrinkage rate is 15% or less, fluffiness is likely to occur. More preferably, it is 10% or less.

As a method of combining the highly shrinkable normal pressure cation dyeable polyester fiber and the fiber having a different color development property and a low hot water shrinkage rate, in the case of a woven fabric, a high shrinkage polyester fiber is used for either the warp or the weft. On the other hand, fibers having different color development properties and a low hot water shrinkage rate may be used, or both threads may be aligned and used for warp and / or weft. In the case of knitting, both threads are aligned and used.

In this case, the mass ratio of the highly shrinkable normal pressure cation dyeable polyester fiber to the fiber having different color development and low hot water shrinkage ratio may be 10:90 to 90:10 in the fabric. It is preferable that the ratio is 20:80 to 40:60. In the region where the mass ratio of the highly shrinkable normal pressure cation dyeable polyester fiber and the fiber having a different color development property and a low hot water shrinkage rate is 10:90 to 90:10, a fabric having excellent fluffiness can be obtained.

Further, the fabric of the present invention may be a combination of a single yarn of the highly shrinkable atmospheric pressure cationic dyeable polyester fiber of the present invention and a mixed yarn using the highly shrinkable cationic dyeable polyester fiber. ..

Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to these examples. In addition, each evaluation in the examples was performed as follows.

(Tensile test)
According to JIS-L-1013, the measurement was performed using an AGS-1kNG autograph tensile tester manufactured by Shimadzu Corporation under the conditions of a sample yarn length of 20 cm and a constant velocity tensile speed of 20 cm / min. The value obtained by dividing the maximum value of the load on the load-elongation curve by the fineness is defined as the breaking strength (cN / dtex), and the elongation rate at that time is defined as the breaking elongation (%). It was.

(Hot water shrinkage rate)
The hot water shrinkage rate of the highly shrinkable normal pressure cation dyeable polyester fiber or the mixed fiber yarn using the same is obtained by applying a load of 0.03 g × total fineness (dtex) to the sample yarn and measuring 500 mm correctly, 2 After removing the spotting and the initial load, this is immersed in hot water at 100 ° C. for 30 minutes, then air-dried and again applied with a load of 0.03 g × total fineness (dtex), and the length between the marked two points. L (mm) was measured, and the hot water shrinkage rate was calculated by the following formula. It was measured 5 times and the average value was calculated.
Hot water shrinkage rate (%) = {(500-L) / 500} x 100

(Spinning operability)
In Examples 1 to 10 and Comparative Examples 1 to 10, the spinning operability was evaluated from the degree of increase in the spinning filtration pressure and the number of yarn breaks when the highly shrinkable normal pressure cation dyeable polyester fiber was produced. The evaluation criteria are as follows.
Excellent: ○
Slightly inferior: △
Inferior: ×
If the evaluation is ◯ or Δ, the spinning operability is satisfactory.

(Color development (cationic dye dyeing property))
A tubular knitting sample was prepared using a highly shrinkable atmospheric pressure cationic dyeable polyester fiber, and the dyeability with a cationic dye was Kayacryl Blue GSL-ED (manufactured by Nippon Kayaku Co., Ltd.) 3.0% boiling, 0 acetate. Staining was performed at a boiling temperature of normal pressure (98 ° C.) for 60 minutes at 2 g / l and a bath ratio of 1:50, and the absorbance of the dyeing solution before and after staining was measured. Then, the exhaustion rate (%) was calculated from the following formula, and the case where the exhaustion rate was 90% or more was evaluated as ◯, the case where the exhaustion rate was 80% or more and less than 90% was evaluated as Δ, and the case where it was less than 80% was evaluated as ×.
Absorption rate (%) = {(absorbance before staining-absorbance after staining) / absorbance before staining} x 100
If the evaluation is ◯ or Δ, the cation dye dyeability is high and the color development is satisfactory.

(Fastness (light resistance))
A tubular knitting sample was prepared using a highly shrinkable normal pressure cation dyeable polyester fiber, and a light resistance test was conducted as an evaluation of fastness. Kayaclyl Blue GSL-ED (manufactured by Nippon Kayaku Co., Ltd.) Dyeing at 0.2% owf or 1.0% owf at 98 ° C. under normal pressure at a bath ratio of 1:30 for 30 minutes, washing with water, drying, and 160 ° C. After heat-setting for × 1 minute, each of them was subjected to a 20-hour light resistance test and a 40-hour light resistance test in an environment of 63 ° C. with a fade meter, and the fading status was compared with the blank. In the judgment, those that are not different from the blank after the 20-hour light resistance test are classified as grade 3 or higher, those that are not different from the blank after the 40-hour light resistance test are classified as grade 4 or higher, and those less than grade 3 are × grade 3 or higher 4 Less than grade was marked with Δ, and grade 4 and above were marked with ○.
If the evaluation is ◯ or Δ, the robustness is satisfactory.

(Thickness)
The thickness of the produced fabric was measured at 5 locations by applying a load of 0.120 ^{kg to a measurement area of 0.25π cm 2} using a thickness gauge SM-114 (manufactured by Teclock Co., Ltd.), and the average value of the fabric was measured. The thickness was set.

(Fukurami evaluation)
The prepared fabric was touched by hand to evaluate the fluff. The evaluation criteria are as follows.
Very good: ◎
Excellent: ○
Slightly inferior: △
Inferior: ×
If the evaluation is ◎ or ○, it is a satisfactory fluff.

(Example 1)
The main repeating unit is ethylene terephthalate, which contains 2.5 mol% of 5-sodium sulfonate group-containing isophthalic acid (SIPE) with respect to the acid component of polyester A, and PEG having an average molecular weight of 200 with respect to polyester A. Polyester A (manufactured by KB Salen Co., Ltd.) containing 3.0% by mass, and polyester B (manufactured by KB Salen Co., Ltd.) containing SPG in a proportion of 20 mol% with respect to the glycol component of polyester B, in which the main repeating unit is ethylene terephthalate. Product name: "ALTESTER S2000" (manufactured by Mitsubishi Gas Chemical Co., Ltd.) mixed at a mass ratio of 95: 5 is melted and discharged at 289 ° C., and GR1 with a peripheral speed of 940 m / min and a temperature of 78 ° C. It was stretched 3.3 times in GR2 at a speed of 3100 m / min and a temperature of 90 ° C. to prepare a highly shrinkable normal pressure cation dyeable polyester fiber of 33 dtex / 12 f.
Tensile test measurement and hot water shrinkage measurement of the produced fiber were carried out, and spinning operability, dyeing property, and light resistance were evaluated.

Next, the fibers produced in Example 1 and 56 dtex / 48f polyamide 6 fibers having a breaking strength of 4.60 cN / dtex, a breaking elongation of 43.0%, and a hot water shrinkage rate of 10.5% (KB Seiren Co., Ltd.) (Manufactured) and one by one (mixed fiber ratio 37:63) were mixed with air to prepare a mixed fiber yarn having a number of entanglements of 20 to 70 pieces / m.
The obtained mixed yarn was subjected to circular knitting using a tubular knitting machine (NCR-EW) (manufactured by Eiko Sangyo Co., Ltd.) to obtain knitted fabrics of wale 58 and course 40. The obtained knitted fabric was dyed at 98 ° C. with 1.0% by mass of a cationic dye, and then fluffy evaluation was carried out.
These results are also shown in Table 1.

(Examples 2 to 7, Comparative Examples 1 to 8)
As shown in Table 1, the high shrinkage normal pressure is the same as in Example 1 except that the resin composition ratio of polyester A, the molecular weight of PEG, and the mixing ratio (mass ratio) of polyester A and polyester B are changed. Cationic dyeable polyester fibers were produced.
Tensile test measurement and hot water shrinkage measurement of the produced fiber were carried out, and spinning operability, dyeing property, and light resistance were evaluated.
Next, a mixed fiber yarn was prepared in the same manner as in Example 1, a knitted fabric was prepared from the obtained mixed fiber yarn, dyed, and then fluffy evaluation was carried out.
These results are also shown in Table 1.

(Examples 8 to 10, Comparative Examples 9 to 10)
As shown in Table 1, the resin composition ratio of polyester B has been changed (trade name: "ALTESTER S3002" (manufactured by Mitsubishi Gas Chemical Co., Ltd.) is used), or the mixing ratio of polyester A and polyester B (mass ratio). ) Was changed, and high shrinkage polyester fibers were produced in the same manner as in Example 1.
Tensile test measurement and hot water shrinkage measurement of the produced fiber were carried out, and spinning operability, dyeing property, and light resistance were evaluated.
Next, a mixed fiber yarn was prepared in the same manner as in Example 1, a knitted fabric was prepared from the obtained mixed fiber yarn, dyed, and then fluffy evaluation was carried out.
These results are also shown in Table 1.

The high shrinkage normal pressure cation dyeable polyester fibers of Examples 1 to 10 showed sufficiently high values of breaking strength and breaking elongation. The dyeing property and light resistance were ◯ or Δ. Further, the hot water shrinkage rate was 40% or more, which was a sufficiently high hot water shrinkage rate even as a mixed fiber yarn. Further, when a fabric is made by using a mixed yarn in combination with a highly shrinkable normal pressure cation dyeable polyester fiber and a polyamide fiber, the thickness change before and after dyeing is large, and in particular, Examples 6, Example 7, and Examples. In the fabrics of 9 and Example 10, the fluff was ⊚. In addition, the high shrinkage normal pressure cation dyeable polyester fiber and the polyamide fiber had different color development properties, resulting in a heather tone, and the appearance was excellent with a design.

Comparative Example 1, Comparative Example 3, Comparative Example 5, Comparative Example 7 and Comparative Example 9 have a hot water shrinkage rate of less than 40%, and the lower the hot water shrinkage rate, the more the thickness changes before and after dyeing when the fabric is used. Was small and the fluff was Δ or ×.

Comparative Example 2, Comparative Example 4, Comparative Example 6, Comparative Example 8 and Comparative Example 10 showed a hot water shrinkage rate of 40% or more, a large change in thickness before and after dyeing when used as a cloth, and fluffy ◎ or ○. Met. However, the light resistance was x and the fastness was not satisfactory.

The high shrinkage polyester fiber of the present invention is suitably used for fabrics that require excellent appearance and fluffiness.

Claims (6)

The main repeating unit is ethylene terephthalate, and polyester is a polyalkylene glycol containing 2.0 to 3.0 mol% of a metal sulfonate group-containing isophthalic acid component with respect to the acid component of polyester A and having an average molecular weight of 150 to 400. Polyester A contained in a ratio of 2.0 to 3.5% by mass with respect to A, and the main repeating unit is ethylene terephthalate, and contains 15 to 35 mol% of spiroglycol with respect to the glycol component of polyester B. A highly shrinkable normal pressure cation dyeable polyester fiber characterized by having a resin having a mixing ratio (mass ratio) of 80:20 to 95: 5 with polyester B and a hot water shrinkage rate of 40% or more. The highly shrinkable normal pressure cation dyeable polyester fiber according to claim 1, which has a breaking strength of 2.0 cN / dtex or more. A mixed yarn using the highly shrinkable normal pressure cation dyeable polyester fiber according to claim 1 or 2. A mixed fiber yarn using the highly shrinkable normal pressure cation dyeable polyester fiber and the polyamide fiber according to claim 1 or 2. A fabric using the highly shrinkable normal pressure cation dyeable polyester fiber according to claim 1. A fabric using the mixed yarn according to claim 3 or 4.