JP2015067923A - Cation-dyeable polyamide fiber, woven and knitted fabric, and sewn product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cation-dyeable polyamide fiber that produces a woven and knitted fabric and a sewn product each having excellent color development properties, being excellent in uniform dyeability without strips or unevenness and having chambray texture.SOLUTION: The cation-dyeable polyamide fiber (1) contains 0.02-0.1 mass% of at least one kind of metal selected from among magnesium, zinc and tin in the fiber and has an amino terminal group amount of 1.0×10to 5.0×10mol/g, a sulfonic acid terminal group amount of 3.0×10to 7.0×10mol/g, and a relative viscosity of 2-4. The woven and knitted fabric (2) is composed of two or more kinds of fibers showing multicolor-dyeability with each other and uses the cation-dyeable polyamide fiber in a part of the woven and knitted fabric. The woven and knitted fabric (3) is a base fabric for an inner wear, a sport wear and a down jacket. The sewn product (4) uses the woven and knitted fabric (2) or (3) in a part of the sewn product.

Description

The present invention relates to a polyamide fiber having cationic dyeability, and a woven or knitted fabric or a sewn product using the same.

  Synthetic fibers such as polyamide fibers and polyester fibers are widely used in clothing and industrial applications because they have excellent mechanical and chemical properties. In particular, polyamide fibers represented by nylon 6 and nylon 66 have been used in many apparel applications due to their excellent strength, abrasion resistance, deep dyeability, ease of resin processing, and the like. In recent years, with the diversification of fashion and the expansion of applications, fabrics with a sense of chambray with a high design property have been required for innerwear, sportswear, casual wear, and the like.

  On the other hand, in interior applications such as tile carpets, fibers are colored in a plurality of colors. For this reason, it is practiced to combine a polyamide fiber dyed with a normal anionic dye and a polyamide fiber dyed with a cationic dye into a carpet (Patent Document 1). In order to impart cation dyeability to a polyamide fiber, it is known to introduce a sulfonic acid end group having affinity for a cationic dye into a polyamide molecule. It is known that good dyeability can be obtained by optimizing the amount of terminal groups (Patent Document 2).

  On the other hand, a method of adding a magnesium compound has been reported as a melt spinning method for polyamide that can suppress the formation of low-polymerized products such as monomers and oligomers during melt spinning and improve the spinning operability (Patent Literature). 3).

Japanese Patent Laid-Open No. 2001-146652 JP-A-11-5839 JP 2003-239135 A

  However, when the methods described in Patent Document 1 and Patent Document 2 are applied to clothing, that is, a combination of a polyamide fiber dyed with a normal anionic dye (hereinafter referred to as an anion dyeable polyamide fiber) and a cationic dyeable polyamide fiber. When used as clothing fabrics, after dyeing, acid dyes used for dyeing anion-dyeable polyamide fibers contaminate and transfer colors to the cation-dyeable polyamide fibers, causing streaks and unevenness and requiring uniform dyeability. It was not satisfactory as a product grade for clothing use. Also, when producing a cationic dyeable polyamide fiber by melt spinning, the low polymer is sublimated or bleed out from the polymer yarn at the time of melting, or the polymer yarn itself adheres to the spinneret surface, so that the spinneret surface Accumulate and cause thread breakage.

  Although it is possible to improve the spinning operability by the method described in Patent Document 3, there is no mention of dyeability.

  Therefore, in the present invention, a high-quality cationic dyeable polyamide fiber having excellent color developability when dyed with a cationic dye and having uniform dyeability without streaks or unevenness is obtained with stable operability. Another object of the present invention is to provide a woven and knitted fabric and a sewn product having a chambray feeling having a high design property.

In order to achieve the above object, the cationic dyeable polyamide fiber of the present invention mainly has the following constitution. That is,
(1) The fiber contains at least one metal selected from magnesium, zinc and tin in an amount of 0.02 to 0.1% by mass, and the amino terminal group amount is 1.0 × 10 ^{−5 to} 5.0 ×. ^10-5 mol / g, a sulfonic acid end group amount of 3.0 × 10 ^{−5 to} 7.0 × 10 ⁻⁵ mol / g, and a relative viscosity of 2 to 4, characterized in that it is a cationic dyeable polyamide fiber .
(2) The cationic dyeable polyamide fiber according to (1), wherein the metal is a metal compound of any one of oxide, hydroxide, chloride, carbonate, and acetate.
(3) A woven or knitted fabric comprising two or more kinds of fibers exhibiting different dyeing properties, and using the cationic dyeable polyamide fiber according to (1) or (2) as a part thereof.
(4) The woven or knitted fabric according to (3), which is a base fabric for innerwear, sportswear, or down jacket.
(5) A sewn product partially using the knitted or knitted fabric according to (3) or (4).
It is.

  According to the present invention, the coloring property selected when dyeing with a cationic dye is obtained, and there is no streak or unevenness and uniform dyeing property. Moreover, the woven or knitted fabric and sewn product using at least a part of the cationic dyeable polyamide fiber of the present invention can provide a woven and knitted fabric and sewn product having a chambray feeling with high design.

The polyamide in the cationic dyeable polyamide fiber of the present invention is a high molecular weight product in which a so-called hydrocarbon group is connected to the main chain through an amide bond, and examples thereof include hexamethylene adipamide units. Units, that is, a diamine other than hexamethylenediamine and adipic acid, and a dibasic acid may be included as a copolymerization component, and lactams and ω-amino acids may be copolymerized. Specific examples of diamines include tetramethylene diamine, nonamethylene diamine, undecamethylene diamine, dodecamethylene diamine, 2,2,4-trimethylhexamethylene diamine, 2,4,4-trimethylhexamethylene diamine, and bis- ( 4,4'-aminocyclohexyl) methane, metaxylylenediamine and the like. Dibasic acids include glutaric acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecadioic acid, hexadecadioic acid, hexadecenedioic acid, eicosandioic acid, diglycolic acid, 2,2,4 -Trimethyladipic acid, xylylene dicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, terephthalic acid, isophthalic acid and the like. Any polyamide may be used for the polyamide fiber of the present invention, but polycaprolactam (nylon 6) and polyhexamethylene adipamide (nylon 66) are preferable from the viewpoint of production cost and fiber strength retention, and the dispersibility of the metal compound In view of the above, polycaprolactam is more preferable.

  It is important that the cationic dyeable polyamide fiber of the present invention contains 0.02 to 0.1% by mass of at least one metal selected from magnesium, zinc, and tin.

  By containing a metal, the decomposition reaction of the polyamide polymer main chain can be inhibited, and an increase in the amount of amino end groups generated by the decomposition reaction can be suppressed. In addition, when using a mixture of cationic dyeable polyamide fibers and fibers exhibiting different dyeing properties, uniform dyeing is achieved by minimizing the effects of contamination by two types of dyes, which are different from cationic dyes and known dyes other than cationic dyes. Sex can be expressed. When the metal content is less than 0.02% by mass, it is insufficient to inhibit the degradation reaction of the polyamide polymer main chain, the amino end group amount is not controlled, and is affected by contamination with different dyes, Streaks and unevenness occur and uniform dyeability cannot be obtained. When the content exceeds 0.1% by mass, the effect of inhibiting the decomposition reaction is not changed, but when the cationic dyeable polyamide fiber yarn is produced, foreign matter in which the metal is aggregated is easily generated, and the uniformity of dyeing is reduced. In addition, fluff and single yarn breakage increase and operability decreases. The metal content is preferably 0.02 to 0.08% by mass, more preferably 0.02 to 0.06% by mass from the viewpoint of uniform dyeability and operability.

It is important for the cationic dyeable polyamide fiber in the present invention that the amino terminal group amount is 1.0 × 10 ^{−5 to} 5.0 × 10 ⁻⁵ mol / g. By using such a range, when using a mixture of cationic dyeable polyamide fiber and fiber exhibiting a different dyeing property, there is no influence of contamination by two types of dyes different from the known dyes other than the cationic dye and the cationic dye, Uniform dyeability can be expressed. When the viscosity is less than 1.0 × 10 ⁻⁵ mol / g, the operability as a fiber decreases due to an increase in relative viscosity, or uneven dyeing occurs due to excessive presence of sulfonic acid end groups, thereby obtaining uniform dyeing properties. I can't. When it exceeds 5.0 × 10 ⁻⁵ mol / g, the cationic dyeable polyamide fiber is contaminated with known dyes other than the cationic dye, streaks and unevenness occur, and uniform dyeability cannot be obtained. From the viewpoints of operability and uniform dyeability, 1.5 × 10 ^{−5 to} 4.5 × 10 ⁻⁵ mol / g is preferable, and 2.8 × 10 ^{−5 to} 4.0 × 10 ⁻⁵ is more preferable. mol / g.

The amount of amino end groups, amount of sulfonic acid end groups, and relative viscosity of the cationic dyeable polyamide fiber have the following relationship. That is, the amount of amino end groups decreases as the amount of sulfonic acid end groups increases and the relative viscosity increases, and the amount of amino end groups increases as the amount of sulfonic acid end groups decreases and the relative viscosity decreases. Therefore, in order to control the amount of amino end groups within such a range, the amount of sulfonic acid end groups is 3.0 × 10 ^{−5 to} 7.0 × 10 ⁻⁵ mol / g and the relative viscosity is 2 to 4. It is important to meet at the same time.

  It is important that the cationic dyeable polyamide fibers of the present invention contain sulfonic acid end groups. The cationic dye is a cationic dye and can be dyed by forming an ionic bond with an anionic site in the fiber. The role of the sulfonic acid end group is to enable dyeing with a cationic dye in addition to controlling the amount of amino end group described above. Examples of the compound containing a sulfonic acid end group for introducing a sulfonic acid end group into a cationic dyeable polyamide molecule include 5-sulfoisophthalic acid, 4-sulfoisophthalic acid, 2-sulfo-para-crezoxyacetic acid, Examples thereof include sulfoalkali metal salts such as 3-sulfobenzoic acid and 4-sulfoacetic acid.

It is important that the cationic dyeable polyamide fiber of the present invention has a sulfonic acid end group amount of 3.0 × 10 ^{−5 to} 7.0 × 10 ⁻⁵ mol / g. When it is less than 3.0 × 10 ⁻⁵ mol / g, the color developability after dyeing the cationic dyeable polyamide fiber with the cationic dye cannot be obtained. When it exceeds 7.0 × 10 ⁻⁵ mol / g, the sulfonic acid end groups are not uniformly dispersed in the cationic dyeable polyamide, streaks and unevenness occur, and uniform dyeability cannot be obtained. From the point of color developability and uniform dyeability, 4.0 × 10 ^{−5 to} 6.8 × 10 ⁻⁵ mol / g is preferable, and 4.5 × 10 ^{−5 to} 6.5 × 10 ⁻⁵ is more preferable. mol / g.

  It is important that the cationic dyeable polyamide fiber of the present invention has a relative viscosity of 2 to 4. If it is less than 2, the strength as the cationic dyeable polyamide fiber is insufficient, and even when the target dyeing rate is obtained, the strength of the obtained woven or knitted fabric is lowered, which is not preferable for clothing. Furthermore, since the cationic dyeable polyamide fiber having a low relative viscosity has a large amount of amino end groups, the cationic dyeable polyamide fiber is contaminated with known dyes other than the cationic dye, causing streaks and unevenness, and uniform dyeing. Sex cannot be obtained. If the relative viscosity exceeds 4, uniform dyeing becomes difficult. In this respect, 2.2 to 3.7 is preferable, and 2.4 to 3.5 is more preferable.

  The form of the cationic dyeable polyamide fiber of the present invention is not limited to long fibers and short fibers, but particularly from the viewpoint of higher workability and fabric strength when used as a base fabric for innerwear, sportswear, and down jackets. Long fibers are preferred. Moreover, although there is no limitation in a use, it is preferably used for a clothing use.

  Although the total fineness of the cationic dyeable polyamide fiber of the present invention is not particularly limited, in the case of apparel use, the total fineness usually used may be used and is preferably 155 dtex or less. In particular, 60 dtex or less is more preferable, 50 dtex or less is more preferable, and 35 dtex or less is particularly preferable from the viewpoint of lightness of the fabric when used as a base fabric for innerwear, sportswear, or a down jacket. The lower limit of the total fineness is not particularly limited as long as it does not interfere with the production of the fabric, but is preferably 5 dtex or more. Further, the single yarn fineness is not particularly limited, but in the case of clothing, it may be a single yarn fineness that is usually used, and is preferably 3.0 dtex or less. In particular, from the viewpoint of fabric texture and comfort, it is more preferably 2.5 dtex or less, and particularly preferably 2.0 dtex or less. The lower limit of the single yarn fineness is not particularly limited as long as it does not interfere with the production of the fabric, but is preferably 0.3 dtex or more.

  The high elongation of the cationic dyeable polyamide fiber of the present invention is not particularly limited. However, in the case of apparel, it may be a high elongation that is usually used. From the viewpoint of high-order processing, the elongation is 35 to 50% and the strength is high. 2.5 cN / dtex or more is more preferable.

The manufacturing method of the cationic dyeable polyamide fiber of this invention is demonstrated.
The cationic dyeable polyamide fiber of the present invention is most excellent in production by melt spinning from the viewpoint of productivity and cost. In addition, as for the production method by melt spinning, a method of continuously performing the spinning-drawing process (direct spinning drawing method), a method of winding the undrawn yarn once and then drawing (two-step method), or a spinning speed of 3000 m / It can be produced by any method such as a method (high speed spinning method) that substantially eliminates the stretching step at a high speed such as min or more. Examples of production by the direct spinning drawing method will be described below.

  First, the melting part of melt spinning will be described. In melting the polyamide, a pressure melter method or an extruder method can be mentioned, but both are not particularly limited. The polyamide containing the metal compound that has flowed into the spin pack is discharged from a known spinneret. Further, the melting temperature and spinning temperature (so-called temperature keeping temperature around the polymer pipe or spinning pack) are preferably the melting point of the polyamide polymer + 20 ° C. to the melting point + 60 ° C.

  In the method for producing a cationic dyeable polyamide fiber of the present invention, a metal compound containing at least one selected from magnesium, zinc and tin is contained in an amount of 0.02 to 0.1% by mass with respect to the cationic dyeable polyamide. When the amount is less than 0.02% by mass, streaks and unevenness occur, and uniform dyeability cannot be obtained. When it exceeds 0.1 mass%, the foreign material which the metal in the metal compound aggregated is easy to produce | generate, and a fluff, a single thread breakage, etc. increase, and operativity falls. From the standpoint of uniform dyeability and operability, the content of the metal compound is preferably 0.02 to 0.08 mass%, more preferably 0.02 to 0.06 mass%, as a metal.

  The metal is preferably added as a metal compound of any one of oxide, hydroxide, chloride, carbonate and acetate. From the viewpoint of dyeing uniformity, preferred are magnesium compounds and zinc compounds, and particularly preferred are magnesium oxide, magnesium hydroxide, magnesium carbonate, magnesium acetate and zinc oxide.

  The method of containing a metal compound is not limited to the production of polyamide pellets or the production of polyamide fibers. When it is added at the time of polyamide fiber production, the master pellets containing a high concentration of the metal compound and the polyamide pellets not containing the metal compound are blended and melt-spun in the polyamide pellets, or the metal compound is directly applied to the molten polyamide. Examples of the method include melt kneading after addition kneading. Moreover, when adding at the time of polyamide pellet manufacture, the method etc. which add a metal compound to a raw material or a reaction system in the stage before superposition | polymerization of polyamide, or a polymerization process, etc. are mentioned.

In the method for producing a cationic dyeable polyamide fiber of the present invention, it amounts amino end groups is ^{1.0 × 10 -5 ~5.0 × 10 -5} mol / g, the amount of sulfonic acid end groups is 3. It is important to simultaneously satisfy the ranges of 0 × 10 ^{−5 to} 7.0 × 10 ⁻⁵ mol / g and relative viscosity of 2 to 4. The amount of amino end groups, amount of sulfonic acid end groups, and relative viscosity of the cationic dyeable polyamide fiber have the following relationship. That is, the amount of amino end groups decreases as the amount of sulfonic acid end groups increases and the relative viscosity increases, and the amount of amino end groups increases as the amount of sulfonic acid end groups decreases and the relative viscosity decreases. In the production method of the cationic dyeable polyamide fiber in the present invention, by carrying out in such a range, it is possible to obtain a cationic dyeable polyamide fiber having target characteristics such as raw yarn strength, color developability and uniform dyeability with good operation. It is possible to improve productivity and reduce costs.

  The polyamide yarn discharged from the spinneret is cooled, solidified and lubricated in the same manner as ordinary melt spinning. After extending | stretching by 1.0-3.0 times, it winds up to a package at 3000 m / min or more, Preferably 3500-4500 m / min. At this time, by appropriately designing the draw ratio between the first godet roller and the second godet roller and the winding speed (winder speed), the desired high elongation of the polyamide yarn can be obtained. Is possible. Moreover, it is preferable to design the thermal contraction of the multifilament by performing heat treatment using the second godet roller as a heating roller. Each godet roller may be a Nelson roller, a drive roller with a driven separation roller, or a one-sided roller. It is preferable that the heat processing temperature is 120-180 degreeC. In addition, it is possible to perform entanglement using a known entanglement device in the process up to winding. If necessary, the number of confounding can be increased by giving confounding multiple times. Furthermore, it is also possible to add an oil agent immediately before winding.

  Furthermore, the cation dyeable polyamide fiber obtained in the present invention can be used by mixing with fibers exhibiting a different dyeing property to provide a woven or knitted fabric and a sewn product having a high design feeling of chambray. . The fiber exhibiting the metachromatic property is a fiber that can be dyed separately with a cationic dye and a known dye other than the cationic dye, such as a direct dye, an acid dye, or a disperse dye. That is, when two types of mixed dyes of a cationic dye selected from red, blue and yellow and a dye selected from one color different from red, blue and yellow are simultaneously dyed in the same dyeing bath. The fiber dyed in the color of the other dye due to the difference in adsorption mechanism and adsorption speed of the dye. For example, when dyed with a mixed dye of a red cationic dye and a yellow acid dye, the fiber is dyed yellow.

  In contrast to the cationic dyeable polyamide fiber obtained in the present invention, the fibers exhibiting different dyeing properties are not limited to chemical fibers and natural fibers, but examples of chemical fibers include polyamides represented by nylon 6 and nylon 66. Examples thereof include fibers, polyester fibers represented by polyethylene terephthalate, and polyolefin fibers represented by polypropylene. For clothing use, polyamide fibers and polyester fibers are preferred. Polyamide fibers are more preferable for innerwear, sportswear, and down jacket applications. Particularly preferred is a polyamide fiber dyed with an acid dye.

  Examples of polyamide fibers dyed with acid dyes are polymers in which so-called hydrocarbon groups are linked to the main chain via amide bonds, such as polycaprolactam (nylon 6), polyhexamethylene adipamide ( Nylon 66), polyhexamethylene sebamide (nylon 6,10), polytetramethylene adipamide (nylon 4,6), condensation of 1,4-cyclohexanebis (methylamine) with linear aliphatic dicarboxylic acid Examples thereof include polymerized polyamide and the like, and copolymers or mixtures thereof.

  The woven or knitted fabric of the present invention comprises two or more kinds of fibers exhibiting different dyeing properties, and a cationic dyeable polyamide fiber obtained by the present invention is used for a part thereof. The structure of the knitted or knitted fabric is not limited, and in the case of a woven fabric, the structure may be any of a plain structure, a twill structure, a satin structure or their changed structure, and a mixed structure, In order to obtain a strong woven fabric with a firm texture, a ripstop organization that combines a plain structure with many restraint points, a plain organization, a stone texture, and a Nanako organization is preferable. In addition, the structure of the knitted fabric is not limited. In the case of a knitted fabric, the structure may be a round knitted fabric, interlocked fabric, warp knitted fabric half, satin, jacquard, Any of these changed structures and mixed structures may be used, but a half structure of a single tricot knitted fabric is preferable because the knitted fabric is thin and stable and has an excellent elongation rate.

  The sewn product of the present invention comprises two or more kinds of fibers exhibiting different dyeing properties, and a woven or knitted fabric using the cationic dyeable polyamide fiber of the present invention is used as a part thereof. Although its use is not limited, it is preferably used for clothing, more preferably sports such as innerwear and ski wear, down jacket, windbreaker, golf wear, rainwear, casual wear, and women's men's clothing. Particularly preferred are innerwear, sportswear and down jackets.

Next, the present invention will be described specifically by way of examples.
Each measured value of the present invention followed the following method.

A. Amino end group amount 1 g of chip and fiber sample (absolutely dried) is added to 40 ml of a mixed solvent of phenol and ethanol (20 g of ethanol added to 80 g of phenol) and dissolved at room temperature. This is titrated with a 0.02N hydrochloric acid solution using an automatic recording potentiometric titrator to determine the amount of amino end groups.

B. A sulfonic acid end group amount chip, 0.3 g of a fiber sample (absolutely dried state) is added to 25 ml of a 10N sulfuric acid solution and hydrolyzed at 105 ° C. for 18 hours. After cooling to room temperature, the absorbance at a wavelength of 283 nm is measured with a self-recording spectrophotometer using a 10 mm quartz cell. 283 nm is the absorption wavelength of the benzene ring contained in the CBS molecule. Using this absorbance, the amount of sulfonic acid end groups is calculated from a calibration curve prepared in advance.

C. Relative Viscosity A 0.25 g chip or fiber sample was dissolved so as to be 1 g per 100 ml sulfuric acid having a concentration of 98% by mass, and the flow time (T1) at 25 ° C. was measured using an Ostwald viscometer. Subsequently, the flow time (T2) of only sulfuric acid having a concentration of 98% by mass was measured. The ratio of T1 to T2, that is, T1 / T2, was defined as sulfuric acid relative viscosity.

D. Metal content Metal content (mass%) was calculated | required by the ash content measurement of a fiber, and X-ray microanalyzer (XMA) measurement made from Horiba Ltd. of an ashed product.
(A) Ash content measurement 10 g of the fiber sample was precisely weighed in a crucible previously baked at 750 ° C., and placed in an electric furnace at 750 ° C. for 2 hours for ashing. The amount of ash remaining in the crucible was precisely weighed, and the ratio with the amount of sample before ashing was defined as the ash content (% by mass).
(B) The ash and ash of the fiber obtained with the metal content (a) was subjected to qualitative and quantitative analysis with an X-ray microanalyzer (XMA) to calculate the metal content (magnesium, zinc, tin) in the fiber.
Metal content in fiber (magnesium, zinc, tin (mass%))
= Ash content (mass%) x metal content (magnesium, zinc, tin) / total metal content.

E. A fine fiber sample is wound up 200 times with a measuring instrument having a frame circumference of 1.125 m with a tension of 0.037 cN / dtex. Dry at 105 ° C. for 60 minutes, transfer to a desiccator, allow to cool for 30 minutes in an environment of 20 ° C. and 55 RH, and calculate the mass per 10,000 m from the value obtained by measuring the weight of the skein. The total fineness of the fiber was calculated at a rate of 4.5%. The measurement was performed 4 times, and the average value was defined as the total fineness. The value obtained by dividing the total fineness by the number of filaments was defined as the single yarn fineness.

F. Strength, elongation The fiber sample is measured according to JIS L1013 (chemical fiber filament yarn test method, 2010) using Tensilon UCT-100 manufactured by Orientec Co., Ltd. 4.20 According to tensile strength and elongation. Went. Tenacity was obtained from the maximum strength in the tensile strength-elongation curve, and the elongation was obtained from the maximum strength elongation. Further, the strength was determined by dividing the maximum strength by the total fineness. The measurement was performed 10 times, and the average value was defined as strength and elongation. The test conditions were a gripping interval of 50 cm and a tensile speed of 50 cm / min.

G. U%
The fiber sample was measured four times at 1 / 2In with ZELLweger Uster USTER TESTER III, sample length: 250 m, measurement yarn speed: 50 m / min, measurement range (12.5% HI), and the average value was measured. The U% value was used.

H. Spinnability was evaluated according to the following criteria.
5: Continuous spinning for 24 hours, no yarn breakage during spinning, and the resulting cationic dyeable polyamide fiber has no fuzz or loops, and has very good spinnability. 4: Continuous spinning for 24 hours, yarn breakage during spinning occurs at a frequency of 1 time or less, and the resulting cationic dyeable polyamide fiber does not generate any fluff and loops, and the spinnability is almost satisfactory. 3: Continuous spinning is performed for 24 hours, and the yarn breakage at the time of spinning occurs up to once, and the resulting cationic dyeable polyamide fiber has slight fuzz and loops, but the spinnability is almost good 2:24 hr Spinning is performed up to 3 times, and the spinning performance is poor, the spinning performance is 1:24 hr, and the spinning performance is more than 3 times. Very bad.

I. Dyeing evaluation (1) Production of tubular knitted fabric A tubular knitted fabric was produced in the order of cationic dyeable polyamide long fibers and nylon long fibers. In this example and comparative example, three 22 dtex cationic dyeable polyamide long fibers and three nylon 6 long fibers were combined to produce a tubular knitted fabric (42 threads / 25.4 mm) having a total fineness of 66 dtex.
(2) Scouring of tubular knitted fabric 100 ml of the tubular knitted fabric obtained in (1) above was prepared in an amount of 2 g / l of a nonionic surfactant (Neugen SS manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) per 1 g of knitted fabric. After washing at 0 ° C. for 30 minutes, it is washed with running water for 20 minutes and dehydrated with a dehydrator.
(3) Dyeing of tubular knitted fabric 1 (dyed only with cationic dye)
The tubular knitted fabric obtained in the above (2) was dyed using the following dye and dyeing assistant.
Cationic dye: Kayacryl RedGL (manufactured by Nippon Kayaku Co., Ltd.)
Dyeing aid 1: Dydisper CD (manufactured by one company)
Dyeing aid 2: 20 ml of an aqueous solution containing 1% by weight of cationic dye and 2% by weight of dyeing aid 1 was prepared with respect to 1 g of cylinder knitted fabric, and adjusted to pH 4 with dyeing aid 2. The temperature was raised to 90 ° C. at 1.5 ° C./min, dyed at 90 ° C. for 60 minutes, washed with running water for 20 minutes, dehydrated with a dehydrator, and then air-dried.
(4) Dyeing of tubular knitted fabric 2 (dyed with a mixed dye of a cationic dye and an acid dye)
The tubular knitted fabric obtained in the above (2) was dyed using the following dye and dyeing assistant.
Acid dye: Kayanol Yellow N5G (manufactured by Nippon Kayaku Co., Ltd.)
Cationic dye: Kayacryl RedGL (manufactured by Nippon Kayaku Co., Ltd.)
Dyeing aid 1: Dydisper CD (manufactured by one company)
Dyeing aid 2: 20 ml of an aqueous solution containing 1% by weight of acidic dye, 1% by weight of cationic dye and 2% by weight of dyeing aid 1 is prepared per 1 g of tube knitted fabric with respect to 1 g of cylinder knitted fabric. The pH was adjusted to 4 with 2. The temperature was raised to 90 ° C. at 1.5 ° C./min, dyed at 90 ° C. for 60 minutes, washed with running water for 20 minutes, dehydrated with a dehydrator, and then air-dried.
(5) Color developability The cationic dyeable polyamide fiber side of the tubular knitted fabric obtained in the above (3) was evaluated by five-step judgment by five skilled workers, and the average value of the five subjects was obtained.
5: Very vividly colored 4: Vividly colored 3: Stained 2: Almost unstained 1: Unstained
(6) Uniform dyeing property The cationic dyeable polyamide fiber side of the tubular knitted fabric obtained in the above (4) was evaluated by five-step judgment by five skilled workers, and the average value of the five people was obtained.
5: No streak or unevenness 4: Almost no streak or unevenness 3: Partially visible streaks or unevenness, but no problem in use 2: Partially visible streaks or unevenness, cannot be used 1: Overall Streaks and unevenness are seen and cannot be used.
(C) Metachromaticity The cylindrical knitted fabric obtained in the above (4) was evaluated by five-step judgment by five skilled workers, and the average value of the five trainees was obtained.
5: Cationic dyeable polyamide fiber is red, nylon 6 fiber is dyed yellow, and there is no contamination of the cationic dyeable polyamide fiber by acid dye 4: Cationic dyeable polyamide fiber is a little yellowish overall, nylon 6 The fiber is dyed yellow, and there is almost no contamination of the cationic dyeable polyamide fiber by the acid dye. 3: Partially orange of the cationic dyeable polyamide fiber, Nylon 6 fiber is dyed yellow, and part of the cationic dyeable polyamide fiber by the acid dye 2: Cyan-dyed polyamide fibers are mostly orange, nylon 6 fibers are dyed yellow, and acid-dyed cation-dyed polyamide fibers are mostly contaminated 1: Cation-dyed polyamide fibers: Orange , Nylon 6 fiber: dyed yellow and contaminated cationic dyeable polyamide fiber with acid dye

J. et al. Fabric Evaluation (1) Fabric Fabrication 22 dtex 20 fil nylon 6 long fibers are used as warp yarns, cationic dyeable polyamide long fibers are used as weft yarns, and warp density is set to 188 yarns / 2.54 cm and weft density 135 yarns / 2.54 cm. Weaved with a plain structure. The woven fabric was scoured and heat set (intermediate set) at 180 ° C. for 1 minute.
(2) Dyeing of woven fabric The woven fabric obtained in the above (1) was dyed using the following dye and dyeing assistant.
Acid dye: Kayanol Yellow N5G (manufactured by Nippon Kayaku Co., Ltd.)
Cationic dye: Kayacryl RedGL (manufactured by Nippon Kayaku Co., Ltd.)
Dyeing aid 1: Dydisper CD (manufactured by one company)
Dyeing aid 2: 20 ml of an aqueous solution containing 1% by weight of an acidic dye, 1% by weight of a cationic dye and 2% by weight of a dyeing aid 1 per 1 g of the plain fabric is prepared for dyeing with a plain fabric of acetic acid and sodium acetate. The pH was adjusted to 4 with auxiliary agent 2. The temperature was raised to 90 ° C. at 1.5 ° C./minute, dyed using a drum dyeing machine at 90 ° C. for 60 minutes, washed with water, dehydrated and dried.
(3) Chambray feeling The woven fabric obtained in the above (2) was evaluated by a three-step evaluation by five skilled workers, and the average value of the five was determined to be 2 or more.
3: The change in color tone can be strongly confirmed by the angle at which the fabric is observed 2: The change in color tone can be confirmed by the angle at which the fabric is observed 1: No change in color tone by the angle at which the fabric is observed (polymerization of cationic dyeable nylon 6 chips) )
A sodium salt of 5-sulfoisophthalic acid is used as a sulfonic acid end group introducing agent, and hexamethylenediamine is added as a terminal group amount adjusting agent in accordance with a desired amino end group amount. As a polymerization method, the pressure is reduced to a pressure of atmospheric pressure or lower during liquid polymerization to raise the polymerization degree to some extent, and then polymerized to a desired relative viscosity by solid phase polymerization.

[Example 1]
Cationic dyeable nylon 6 chip (amino end group amount 3.4 × 10 ⁻⁵ mol / g, sulfonic acid end group amount 5.0 × 10 ⁻⁵ mol / g, relative viscosity 2.8, melting point 220 ° C.), oxidation After melting and discharging 0.02% by mass of magnesium from a spinneret having 20 nozzle discharge holes at a spinning temperature of 275 ° C. at a spinning temperature of 275 ° C. (discharge amount: 90 kg / day), cooling, refueling and entanglement, 3400 m / min godet roller And then stretched 1.2 times and heat-fixed at 155 ° C. to obtain 22 dtex 20 fil of cationic dyeable nylon 6 long fiber at a winding speed of 4000 m / min.
Operability, amino end group amount, sulfonic acid end group amount, relative viscosity, raw yarn physical properties (fineness, strength, elongation, U%, ash content), cylindrical knitting properties ( Color development property, uniform dyeing property, and metachromatic property) were measured. The results are shown in Tables 1 and 2.

[Example 2]
Under the same spinning conditions as in Example 1, a cationic dyeable nylon 6 chip having the same amino end group amount, sulfonic acid end group amount, and relative viscosity as in Example 1 with a magnesium oxide content of 0.10% by mass Was used to obtain 22 dtex 20 fil of cationic dyeable polyamide fiber. In addition, the operability, amino end group amount, sulfonic acid end group amount, relative viscosity, raw yarn physical properties (fineness, strength, elongation, U%, ash content) of the obtained cationic dyeable nylon 6 fiber, cylinder The knitting characteristics (color development, uniform dyeing, metachromatic) were measured. The results are shown in Tables 1 and 2.

[Example 3]
Under the same spinning conditions as in Example 1, a cation dyeable nylon 6 chip having a magnesium oxide content of 0.03% by mass (amino end group amount 1.4 × 10 ⁻⁵ mol / g, sulfonic acid end group amount) 7.0 × 10 ⁻⁵ mol / g, relative viscosity 2.2) was used to obtain 22 dtex 20 fil of cationic dyeable polyamide fiber. In addition, the operability, amino end group amount, sulfonic acid end group amount, relative viscosity, raw yarn physical properties (fineness, strength, elongation, U%, ash content) of the obtained cationic dyeable nylon 6 fiber, cylinder The knitting characteristics (color development, uniform dyeing, metachromatic) were measured. The results are shown in Tables 1 and 2.

[Example 4]
Under the same spinning conditions as in Example 1, cationic dyeable nylon 6 chips having a magnesium oxide content of 0.04% by mass (amino end group amount 1.0 × 10 ⁻⁵ mol / g, sulfonic acid end group amount) 3.0 × 10 ⁻⁵ mol / g, relative viscosity 3.9) was used to obtain 22 dtex 20 fil of cationic dyeable polyamide fiber. In addition, the operability, amino end group amount, sulfonic acid end group amount, relative viscosity, raw yarn physical properties (fineness, strength, elongation, U%, ash content) of the obtained cationic dyeable nylon 6 fiber, cylinder The knitting characteristics (color development, uniform dyeing, metachromatic) were measured. The results are shown in Tables 1 and 2.

[Example 5]
Under the same spinning conditions as in Example 1, cationic dyeable nylon 6 chip having a magnesium oxide content of 0.03% by mass (amino end group amount 5.0 × 10 ⁻⁵ mol / g, sulfonic acid end group amount) 7.0 × 10 ⁻⁵ mol / g, relative viscosity 2.0) was used to obtain 22 dtex 20 fil of cationic dyeable polyamide fiber. In addition, the operability, amino end group amount, sulfonic acid end group amount, relative viscosity, raw yarn physical properties (fineness, strength, elongation, U%, ash content) of the obtained cationic dyeable nylon 6 fiber, cylinder The knitting characteristics (color development, uniform dyeing, metachromatic) were measured. The results are shown in Tables 1 and 2.

[Example 6]
Under the same spinning conditions as in Example 1, a cation dyeable nylon 6 chip having a magnesium oxide content of 0.06% by mass (amino end group content 4.6 × 10 ⁻⁵ mol / g, sulfonic acid end group content) Using 6.8 × 10 ⁻⁵ mol / g, relative viscosity 2.1), 22 dtex 20 fil of cationic dyeable polyamide fiber was obtained. In addition, the operability, amino end group amount, sulfonic acid end group amount, relative viscosity, raw yarn physical properties (fineness, strength, elongation, U%, ash content) of the obtained cationic dyeable nylon 6 fiber, cylinder The knitting characteristics (color development, uniform dyeing, metachromatic) were measured. The results are shown in Tables 1 and 2.

[Example 7]
Under the same spinning conditions as in Example 1, a cation dyeable nylon 6 chip having a magnesium oxide content of 0.04% by mass (amino end group amount 4.5 × 10 ⁻⁵ mol / g, sulfonic acid end group amount) 4.0 × 10 ⁻⁵ mol / g, relative viscosity 2.1) was used to obtain 22 dtex 20 fil of cationic dyeable polyamide fiber. In addition, the operability, amino end group amount, sulfonic acid end group amount, relative viscosity, raw yarn physical properties (fineness, strength, elongation, U%, ash content) of the obtained cationic dyeable nylon 6 fiber, cylinder The knitting characteristics (color development, uniform dyeing, metachromatic) were measured. The results are shown in Tables 1 and 2.

[Example 8]
Under the same spinning conditions as in Example 1, cationic dyeable nylon 6 chips having a magnesium oxide content of 0.08% by mass (amino end group amount 3.4 × 10 ⁻⁵ mol / g, sulfonic acid end group amount) Using 5.0 × 10 ⁻⁵ mol / g and a relative viscosity of 3.4), 22 dtex 20 fil of cationic dyeable polyamide fiber was obtained. In addition, the operability, amino end group amount, sulfonic acid end group amount, relative viscosity, raw yarn physical properties (fineness, strength, elongation, U%, ash content) of the obtained cationic dyeable nylon 6 fiber, cylinder The knitting characteristics (color development, uniform dyeing, metachromatic) were measured. The results are shown in Tables 1 and 2.

[Example 9]
Under the same spinning conditions as in Example 1, cationic dyeable nylon 6 chips having a magnesium oxide content of 0.08% by mass (amino end group amount 1.5 × 10 ⁻⁵ mol / g, sulfonic acid end group amount) Using 3.0 × 10 ⁻⁵ mol / g and a relative viscosity of 3.6), 22 dtex 20 fil of cationic dyeable polyamide fiber was obtained. In addition, the operability, amino end group amount, sulfonic acid end group amount, relative viscosity, raw yarn physical properties (fineness, strength, elongation, U%, ash content) of the obtained cationic dyeable nylon 6 fiber, cylinder The knitting characteristics (color development, uniform dyeing, metachromatic) were measured. The results are shown in Tables 1 and 2.

[Example 10]
Under the same spinning conditions as in Example 1, a cation dyeable nylon 6 chip having a magnesium oxide content of 0.04% by mass (amino end group amount 4.3 × 10 ⁻⁵ mol / g, sulfonic acid end group amount) Using 4.3 × 10 ⁻⁵ mol / g and a relative viscosity of 2.8), 22 dtex 20 fil of cationic dyeable polyamide fiber was obtained. In addition, the operability, amino end group amount, sulfonic acid end group amount, relative viscosity, raw yarn physical properties (fineness, strength, elongation, U%, ash content) of the obtained cationic dyeable nylon 6 fiber, cylinder The knitting characteristics (color development, uniform dyeing, metachromatic) were measured. The results are shown in Tables 1 and 2.

[Example 11]
Under the same spinning conditions as in Example 1, a cation dyeable nylon 6 chip having a magnesium hydroxide content of 0.04% by mass (amino end group content 3.6 × 10 ⁻⁵ mol / g, sulfonic acid end group) An amount of 5.5 × 10 ⁻⁵ mol / g and a relative viscosity of 2.7) was used to obtain 22 dtex 20 fil of cationic dyeable polyamide fiber. In addition, the operability, amino end group amount, sulfonic acid end group amount, relative viscosity, raw yarn physical properties (fineness, strength, elongation, U%, ash content) of the obtained cationic dyeable nylon 6 fiber, cylinder The knitting characteristics (color development, uniform dyeing, metachromatic) were measured. The results are shown in Tables 1 and 2.

[Example 12]
Under the same spinning conditions as in Example 1, a cation dyeable nylon 6 chip having a magnesium carbonate content of 0.04% by mass (amino end group amount 3.6 × 10 ⁻⁵ mol / g, sulfonic acid end group amount) Using 5.5 × 10 ⁻⁵ mol / g and a relative viscosity of 2.7), 22 dtex 20 fil of cationic dyeable polyamide fiber was obtained. In addition, the operability, amino end group amount, sulfonic acid end group amount, relative viscosity, raw yarn physical properties (fineness, strength, elongation, U%, ash content) of the obtained cationic dyeable nylon 6 fiber, cylinder The knitting characteristics (color development, uniform dyeing, metachromatic) were measured. The results are shown in Tables 1 and 2.

[Example 13]
Under the same spinning conditions as in Example 1, a cation dyeable nylon 6 chip having a magnesium chloride content of 0.04% by mass (amino end group amount 3.6 × 10 ⁻⁵ mol / g, sulfonic acid end group amount) Using 5.5 × 10 ⁻⁵ mol / g and a relative viscosity of 2.7), 22 dtex 20 fil of cationic dyeable polyamide fiber was obtained. In addition, the operability, amino end group amount, sulfonic acid end group amount, relative viscosity, raw yarn physical properties (fineness, strength, elongation, U%, ash content) of the obtained cationic dyeable nylon 6 fiber, cylinder The knitting characteristics (color development, uniform dyeing, metachromatic) were measured. The results are shown in Tables 1 and 2.

[Example 14]
Under the same spinning conditions as in Example 1, a cation dyeable nylon 6 chip having a zinc chloride content of 0.04% by mass (amino end group amount 3.6 × 10 ⁻⁵ mol / g, sulfonic acid end group amount) Using 5.5 × 10 ⁻⁵ mol / g and a relative viscosity of 2.7), 22 dtex 20 fil of cationic dyeable polyamide fiber was obtained. In addition, the operability, amino end group amount, sulfonic acid end group amount, relative viscosity, raw yarn physical properties (fineness, strength, elongation, U%, ash content) of the obtained cationic dyeable nylon 6 fiber, cylinder The knitting characteristics (color development, uniform dyeing, metachromatic) were measured. The results are shown in Tables 1 and 2.

[Example 15]
Under the same spinning conditions as in Example 1, a cation dyeable nylon 6 chip having a magnesium acetate content of 0.02% by mass and a tin oxide content of 0.02% by mass (amino end group content 3.6 × 10 ⁻⁵ mol / g, sulfonic acid end group amount 5.5 × 10 ⁻⁵ mol / g, relative viscosity 2.7) was used to obtain 22 dtex 20 fil of cationic dyeable polyamide fiber. In addition, the operability, amino end group amount, sulfonic acid end group amount, relative viscosity, raw yarn physical properties (fineness, strength, elongation, U%, ash content) of the obtained cationic dyeable nylon 6 fiber, cylinder The knitting characteristics (color development, uniform dyeing, metachromatic) were measured. The results are shown in Tables 1 and 2.

[Comparative Example 1]
Under the same spinning conditions as in Example 1, a cation dyeable nylon 6 chip having a magnesium oxide content of 0.01% by mass (amino end group amount 3.6 × 10 ⁻⁵ mol / g, sulfonic acid end group amount) Using 5.0 × 10 ⁻⁵ mol / g and a relative viscosity of 2.9), 22 dtex 20 fil of cationic dyeable polyamide fiber was obtained. In addition, the operability, amino end group amount, sulfonic acid end group amount, relative viscosity, raw yarn physical properties (fineness, strength, elongation, U%, ash content) of the obtained cationic dyeable nylon 6 fiber, cylinder The knitting characteristics (color development, uniform dyeing, metachromatic) were measured. The results are shown in Tables 1 and 2.

[Comparative Example 2]
Under the same spinning conditions as in Example 1, a cation dyeable nylon 6 chip having a magnesium oxide content of 0.20% by mass (amino end group amount 3.5 × 10 ⁻⁵ mol / g, sulfonic acid end group amount) Using 5.0 × 10 ⁻⁵ mol / g and a relative viscosity of 2.9), 22 dtex 20 fil of cationic dyeable polyamide fiber was obtained. In addition, the operability, amino end group amount, sulfonic acid end group amount, relative viscosity, raw yarn physical properties (fineness, strength, elongation, U%, ash content) of the obtained cationic dyeable nylon 6 fiber, cylinder The knitting characteristics (color development, uniform dyeing, metachromatic) were measured. The results are shown in Tables 1 and 2.

[Comparative Example 3]
Under the same spinning conditions as in Example 1, a cationic dyeable nylon 6 chip having a magnesium oxide content of 0.04% by mass (amino end group amount 5.6 × 10 ⁻⁵ mol / g, sulfonic acid end group amount) Using 1.5 × 10 ⁻⁵ mol / g and a relative viscosity of 3.1), 22 dtex 20 fil of cationic dyeable polyamide fiber was obtained. In addition, the operability, amino end group amount, sulfonic acid end group amount, relative viscosity, raw yarn physical properties (fineness, strength, elongation, U%, ash content) of the obtained cationic dyeable nylon 6 fiber, cylinder The knitting characteristics (color development, uniform dyeing, metachromatic) were measured. The results are shown in Tables 1 and 2.

[Comparative Example 4]
Under the same spinning conditions as in Example 1, a cation dyeable nylon 6 chip having a magnesium oxide content of 0.04% by mass (amino end group amount 0.1 × 10 ⁻⁵ mol / g, sulfonic acid end group amount) 2.0 × 10 ⁻⁵ mol / g, relative viscosity 5.0) was used to obtain 22 dtex 20 fil of cationic dyeable polyamide fiber. In addition, the operability, amino end group amount, sulfonic acid end group amount, relative viscosity, raw yarn physical properties (fineness, strength, elongation, U%, ash content) of the obtained cationic dyeable nylon 6 fiber, cylinder The knitting characteristics (color development, uniform dyeing, metachromatic) were measured. The results are shown in Tables 1 and 2.

[Comparative Example 5]
Under the same spinning conditions as in Example 1, a cation dyeable nylon 6 chip having a magnesium chloride content of 0.04% by mass (amino end group content 7.1 × 10 ⁻⁵ mol / g, sulfonic acid end group amount) Using 8.0 × 10 ⁻⁵ mol / g and a relative viscosity of 1.5), 22 detx 20 fil of cationic dyeable polyamide fiber was obtained. In addition, the operability, amino end group amount, sulfonic acid end group amount, relative viscosity, raw yarn physical properties (fineness, strength, elongation, U%, ash content) of the obtained cationic dyeable nylon 6 fiber, cylinder The knitting characteristics (color development, uniform dyeing, metachromatic) were measured. The results are shown in Tables 1 and 2.

  As is apparent from the results of Tables 1 and 2, the cationic dyeable polyamide fibers according to Examples 1 to 15 of the present invention have excellent color developability when dyed with a cationic dye, and are uniform without streaks or unevenness. It is possible to stably obtain a high-quality cationic dyeable polyamide fiber having excellent dyeability.

  By containing an appropriate amount of at least one metal selected from magnesium, zinc, and tin, it not only has excellent color developability, but also has a uniform dyeing property without streaks or unevenness on the tube knitted fabric, and contamination by different dyes. It can be seen that there is little influence. In addition, by controlling the amount of amino acid end groups and the amount of sulfonic acid end groups appropriately, and by optimizing the relative viscosity, it has excellent color developability and uniform dyeability. It is necessary to uniformly disperse the sulfonic acid terminal, which is a dyeing seat of the cationic dye, in the fiber, but it contains at least one metal selected from magnesium, zinc and tin. By uniformly dispersing, the sulfonic acid end groups are uniformly dispersed. Also, dispersibility can be improved by making the amino terminal group amount and relative viscosity appropriate. Furthermore, the decomposition reaction of the polyamide proceeds during melt spinning, but by containing an appropriate amount of at least one metal selected from magnesium, zinc, and tin, the decomposition reaction is inhibited, and the amino terminal generated during decomposition is generated. By suppressing, the uniform dyeability is improved and the influence of contamination by different dyes is reduced.

  The cationic dyeable polyamide fiber of Comparative Example 1 has streaks and unevenness, and is inferior in uniform dyeability.

  The cationic dyeable polyamide fiber of Comparative Example 2 is inferior in operability due to the generation of foreign matter in which magnesium oxide is agglomerated, increasing fluff and single yarn breakage.

  The cationic dyeable polyamide fiber of Comparative Example 3 does not exhibit sufficient color developability due to a small amount of sulfonic acid end groups as a dyeing seat.

  The cationic dyeable polyamide fiber of Comparative Example 4 is inferior in operability due to a small amount of sulfonic acid end group as a dyeing seat and thus insufficient color development and high relative viscosity.

  The cationic dyeable polyamide fiber of Comparative Example 5 is inferior in uniform dyeability, metachromaticity, and operability, although excellent color developability is obtained.

[Examples 16 to 19]
(Manufacture of nylon 6 long fibers)
Using nylon 6 chips (amino end group amount 6.0 × 10 ⁻⁵ mol / g, relative viscosity 2.7, melting point 220 ° C.), melt discharge from a spinneret having 20 nozzle discharge holes at a spinning temperature of 265 ° C. I let you. After being melted and discharged, the yarn was cooled, lubricated, entangled and then taken up with a 2560 m / min godet roller, then stretched 1.7 times, then heat-set at 155 ° C., and 22 dtex 20 fil at a winding speed of 4000 m / min. Nylon 6 long fibers were obtained.
As a result of measuring the obtained long fibers of nylon 6, the amino end group amount: 6.1 × 10 ⁻⁵ mol / g, relative viscosity: 2.8, fineness: 22.0 dtex, strength: 6.4 cN / dtex The elongation was 46.3% and U% was 0.68.
Using the obtained nylon 6 long fiber as warp, the 22 dtex 20 fil cationic dyeable nylon 6 long fiber obtained in Examples 5, 8, 11, and 14 was used as a weft to produce and dye a plain woven fabric and evaluate the chambray feeling. .

As is apparent from the results in Table 3, the fabric using part of the cationic dyeable polyamide fibers according to Examples 16 to 19 of the present invention provides a fabric with a high design and chambray feeling.

According to the present invention, high-quality cationic dyeable polyamide fibers having excellent high colorability when dyed with a cationic dye and having high uniform dyeability can be obtained with stable operability. Thus, it is possible to provide a woven or knitted fabric and a sewn product having a chambray feeling with high design. Therefore, it is suitable as a clothing material such as sportswear, but its application range is not limited to these.

Claims (4)

At least one metal selected from magnesium, zinc, and tin is contained in the fiber in an amount of 0.02 to 0.1% by mass, and the amino terminal group amount is 1.0 × 10 ^{−5 to} 5.0 × 10 ^−5. A cationic dyeable polyamide fiber having a mol / g, sulfonic acid end group amount of 3.0 × 10 ^{−5 to} 7.0 × 10 ⁻⁵ mol / g, and a relative viscosity of 2 to 4.   A woven or knitted fabric comprising two or more kinds of fibers exhibiting different dyeing properties, and using the cationic dyeable polyamide fiber according to claim 1 as a part thereof.   The knitted or knitted fabric according to claim 2, which is a base fabric for inner wear, sports wear, or down jacket. A sewn product using the woven or knitted fabric according to claim 2 or 3 as a part thereof.