JP2006336119A - Union cloth and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a union cloth composed of an ultrafine multifilament yarn composed of polytrimethylene terephthalate and a cellulosic multifilament yarn and having an excellent soft feeling, color developing properties and mechanical characteristics without deteriorating the touch feeling of the cellulosic multifilament yarn and to provide a method for producing the union cloth. <P>SOLUTION: The union cloth comprises one of a warp yarn and a weft yarn composed of the multifilament yarn composed of the polytrimethylene terephthalate and having 0.01-0.5 dtex filament fineness and the other composed of the cellulosic multifilament yarn. The union cloth is characterized in that the tear strength of the cloth in the direction using the cellulosic multifilament yarn is ≥5 N. The union cloth can be obtained by a method for producing the union cloth characterized as preparing a woven cloth by weaving a sea-island type conjugated multifilament yarn composed of a sea component composed of polylactic acid and an island component composed of the polytrimethylene terephthalate and used as the one of the warp yarn and the weft yarn and the cellulosic multifilament yarn used as the other and then eluting the polylactic acid by a dissolving treatment. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an unwoven fabric of polytrimethylene terephthalate ultrafine yarn and cellulosic fiber and a method for producing the same, and more specifically, polylactic acid and polytrimethylene terephthalate capable of producing polytrimethylene terephthalate ultrafine yarn by dissolution treatment. The present invention relates to an unwoven fabric having excellent mechanical properties and exquisiteness obtained by unweaving sea-island type composite fibers and cellulose-based fibers and removing sea components, and a method for producing the unwoven fabric.

  Cellulosic fibers are widely used mainly in clothing applications due to their excellent texture and functionality such as moisture absorption, water absorption, and antistatic properties, but they have inferior mechanical properties and dimensional stability. In reality, there are many problems in practical use. In order to make up for such drawbacks, a mixture of polyester fiber and polyamide fiber has been used for a long time, and many proposals have been made. By mixing with these synthetic fibers, many of the mechanical properties can be improved, but the resulting fabric has a waxy texture peculiar to synthetic fibers, and the excellent texture of the cellulosic fibers cannot be utilized.

  As a means for improving the texture of the cellulosic fiber fabric, there has been a proposal (Patent Document 1) for making the polyester used for the weft yarn extremely fine, and there is a tendency that the texture becomes soft due to the ultrafine polyester. However, as a method for obtaining such ultrafine fibers, there is a method of directly producing fine yarns, and by eluting or dividing one type of polymer after two or more types of polymers having different chemical resistances are compound-spun. However, in the former production of ultrafine fibers by direct spinning, there is a technical limit to ultrafine fibers at present, and it is reduced to a single fiber fineness for obtaining a good texture in a fabric woven with cellulosic fibers. Is extremely difficult. In the latter method of eluting the polymer, conventionally, in order to improve the dissolution property, it is usual to perform acid treatment before the elution treatment or lengthen the elution treatment time, and the former is interwoven. In the case of cellulosic fibers, the latter, the strength of the polyester itself decreases, and it cannot be used practically. In any case, in the case of a conventional woven fabric of cellulosic fibers and polyester, even if the counterpart polyester is made very fine, it cannot be used at a practical level, but Patent Document 1 does not mention anything about these.

  On the other hand, a proposal has been made to mix a fiber made of polytrimethylene terephthalate, which has an excellent elastic recovery rate and a Young's modulus lower than that of polyethylene terephthalate, with a cellulosic fiber (Patent Document 2). Although it is effective in improving the texture due to the characteristics of polytrimethylene terephthalate, the texture of the polytrimethylene terephthalate to be mixed is not satisfactory when the single fiber fineness is large, and a fabric with a fine feeling is obtained. I can't.

  Furthermore, a method for producing polytrimethylene terephthalate ultrafine fibers from sea-island type composite fibers or split type composite fibers has also been proposed (see Patent Document 3 and Patent Document 4). However, the polymer used as an alkali elution component is a polyester copolymerized with an organic metal salt, the alkali elution time is long, the productivity is poor, and the polymer melting temperature is higher than that of polytrimethylene terephthalate. Since the spinning temperature is high, it is necessary to keep the spinning temperature high. For this reason, the thermal degradation of polytrimethylene terephthalate progresses, the operability is poor, and satisfactory raw yarn strength and texture cannot be obtained.

Furthermore, conventional sea-island type composite fibers or split type composite fibers use copolymerized polyester as an easily-eluting component and are mainly hydrolyzed and removed by alkali treatment, so the waste liquid after hydrolysis Are concerned that it will adversely affect the environment. In order to reduce the environmental impact of this waste liquid, a composite fiber using polylactic acid as an elution component has been proposed (see Patent Document 5). A fabric with a feeling of elaboration cannot be obtained due to the influence of voids formed between the rear single fibers.
Japanese Patent Laid-Open No. 06-025937 JP-A-11-001835 Japanese Patent Laid-Open No. 11-123330 JP 2001-348735 A Japanese Patent Laid-Open No. 11-302926

  The present invention provides an unwoven fabric of cellulosic fibers excellent in practicality, color developability, texture, and fineness, which cannot be achieved by the above-described prior art, and ultrafine fibers made of polytrimethylene terephthalate. .

  Another object of the present invention is to provide a method for producing a woven fabric composed of the above-mentioned cellulosic fibers and ultrafine fibers made of polytrimethylene terephthalate.

  The object of the present invention can be achieved by employing the following configuration. That is, one of the warp yarn and the weft yarn is a woven fabric composed of a multifilament having a single fiber fineness of 0.01 to 0.5 dtex made of polytrimethylene terephthalate, and the other is made of a cellulose multifilament, The unwoven fabric is characterized in that the tear strength of the fabric using the filament is 5 N or more.

According to a preferred embodiment of the union woven fabric of the present invention, the air permeability is less than 15 cc / cm ² · s, and the multifilament made of polytrimethylene terephthalate is obtained by eluting the sea component of the sea-island type composite fiber. It is mentioned that it is a multifilament made.

  The union woven fabric manufacturing method of the present invention is a sea-island composite fiber in which the sea component polymer is composed of polylactic acid and the island component polymer is composed of polytrimethylene terephthalate, and the sea component / island component composite A sea-island type composite fiber in which the ratio is 10/90 to 50/50 and the island fiber single fiber fineness obtained by dissolution treatment is 0.01 to 0.5 dtex is used for either warp yarn or weft yarn, On the other hand, after weaving the woven fabric using cellulosic multifilaments, polylactic acid is eluted by dissolution treatment.

  ADVANTAGE OF THE INVENTION According to this invention, when it is set as the textile for clothing, the unwoven fabric excellent in the coloring property which has a soft feeling and fineness, and was excellent also in the mechanical characteristic is obtained, without impairing the feel of a cellulosic fiber.

  Hereinafter, the best mode for carrying out the unwoven fabric of the present invention and the method for producing the same will be described in detail.

  The union woven fabric of the present invention is a woven fabric in which one of the warp yarn or the weft yarn is made of polytrimethylene terephthalate and the single fiber fineness is 0.01 to 0.5 dtex, and the other is made of cellulosic multifilament. is required.

  Polytrimethylene terephthalate fiber has low Young's modulus and excellent softness and excellent color development properties compared to polyethylene terephthalate, but it is used for warp or weft, especially in the woven fabric of the present invention. By making the single fiber fineness of the multifilament made of polytrimethylene terephthalate to be in a specific range, it is possible to stably produce with excellent color developability without impairing the texture of cellulose. That is, the single filament fineness of the multifilament made of polytrimethylene terephthalate used for warp yarn or weft yarn is 0.01 dtex or more, so that the quality of fluff generation and the like does not decrease without degrading the accuracy of each single fiber. Problems can be suppressed, and color developability is also improved. Moreover, it can be set as the textile of a soft texture, without impairing the texture of the target cellulosic fiber by setting it as 0.5 dtex or less. A more preferable single fiber fineness is 0.05 to 0.2 dtex. The multifilament made of polytrimethylene terephthalate having a single fiber fineness of 0.01 to 0.5 dtex used in the present invention is preferably employed in a range of 30 to 170 dtex in terms of the total fineness.

  In addition, the multifilament made of polytrimethylene terephthalate in the present invention can be produced by a known method for producing ultrafine fibers. From the unique shrinkage characteristics and production stability described later, the sea components of sea-island type composite fibers More preferably, it is a multifilament obtained by eluting.

  The cross-sectional shape of the multifilament made of polytrimethylene terephthalate in the present invention is not particularly limited, and may be a modified cross-section such as a triangle or a flat shape in addition to a round cross-section.

The polytrimethylene terephthalate in the present invention is preferably a polyester obtained using terephthalic acid as the main acid component and 1,3 propanediol as the main glycol component. However, it may contain a copolymer component capable of forming another ester bond at a ratio of 20 mol% or less, preferably 10 mol% or less.
Here, examples of the copolymerizable compound include dicarboxylic acids such as isophthalic acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid and sebacic acid as the acid component, while the glycol component includes, for example, ethylene glycol. , Diethylene glycol, butanediol, neopentyl glycol, cyclohexanedimethanol, polyethylene glycol, polypropylene glycol, and the like, but are not limited thereto.

Further, titanium dioxide as a matting agent, silica or alumina fine particles as a lubricant, a hindered phenol derivative as an antioxidant, and a coloring pigment may be added as necessary.
The union woven fabric of the present invention is constituted by using a multifilament made of polytrimethylene terephthalate of 0.01 to 0.5 dtex in one of warp yarn or weft yarn, but as another fiber, a fiber made of polyethylene terephthalate As long as it does not impair the purpose, natural fibers or the like may be included in part, and the fibers made of polyethylene terephthalate may have a so-called irregular cross section such as a triangle or a flat shape.

In the present invention, the cellulose-based multifilament that is a partner of the multifilament made of polytrimethylene terephthalate in the present invention is a known cellulose-based fiber, for example, regenerated fiber such as rayon or copper ammonia rayon, acetate (diacetate), or triacetate. Examples thereof include semi-synthetic fibers such as lyocell, purified cellulose fibers such as lyocell, and cellulose fibers made from bamboo. These may be used alone or in combination of two or more. Further, the form of the fiber is not particularly limited, and may be any of twisted yarn, blended yarn, false twisted yarn, fluid jetted yarn, and cotton, hemp, wool, as long as the object of the present invention is not impaired. Natural fibers such as silk may be mixed. The single fiber fineness of the cellulose multifilament is preferably 0.2 to 5 dtex, and the total fineness is preferably 30 to 200 dtex.
Next, in the present invention, the tear strength of the unwoven fabric in the direction using the cellulosic multifilament is required to be 5N or more. By setting the tear strength to 5 N or more, a union woven fabric that can withstand practical use is obtained, and by using a sea-island type composite fiber described later, a tear strength of 5 N or more can be achieved. The tear strength in the present invention refers to a value measured according to JIS L1096 (D method; pendulum method).
Moreover, it is especially preferable that the unwoven fabric of the present invention is a smooth and precise fabric with an air permeability of less than 15 cc / cm ² · s. More preferably, it is less than 10 cc / cm ² · s. In the present invention, the air permeability means a value measured according to JIS L1096 (Method A; Frazier method). Such air permeability can be relatively easily reduced by calendering (high temperature and high pressure press) when producing a woven fabric, but is not preferable because the texture becomes paper-like.
The structure of the union woven fabric of the present invention is not particularly limited, and may be any of flat, twill, satin woven fabrics, and their changed structures. Further, the unwoven fabric of the present invention may be subjected to raising treatment with a buff, a brush, a needle or the like as necessary.

  Next, the manufacturing method of the unwoven fabric of this invention is demonstrated.

  The union woven fabric of the present invention is one in which either warp yarn or weft yarn is composed of ultrafine fibers made of polytrimethylene terephthalate, and these ultrafine fibers are preferably obtained from so-called sea-island type composite fibers. . Specifically, a sea-island composite fiber using a polylactic acid polymer as the sea component and a polytrimethylene terephthalate polymer as the island component is preferable. After weaving the fabric using this sea-island type composite fiber for warp or weft and cellulose multifilament on the other side, the sea component polylactic acid is dissolved and removed in the dyeing process or the accompanying process. In this way, ultrafine fibers of polytrimethylene terephthalate are obtained. The ultrafine fiber obtained here is obtained as a multifilament because the sea-island type composite fiber has a cross-sectional structure in which a plurality of island components are scattered in the sea component.

  It is important for the sea-island type composite fiber used in the production method of the present invention to arrange polylactic acid as a sea component. Polylactic acid has a lower melting temperature than polytrimethylene terephthalate or polyethylene terephthalate, so the spinning temperature is higher than when polyethylene terephthalate copolymerized with an organic metal salt whose melting temperature is higher than that of polytrimethylene terephthalate is used as the sea component. Can be kept low, and it is possible to stabilize the operation in the process from the raw yarn production stage to the high-order processing stage, and to prevent a decrease in texture due to thermal deterioration of the polytrimethylene terephthalate which is an island component.

  Polylactic acid generally has a higher alkali elution rate than a polyester copolymerized with an organic metal salt, but it should also be a sea-island composite fiber with polylactic acid as a sea component and polytrimethylene terephthalate as an island component. Thus, the orientation of polylactic acid is suppressed, and the alkali elution rate of polylactic acid becomes faster.

  Furthermore, the sea-island type composite fiber combining polylactic acid and polytrimethylene terephthalate in this way is made from polytrimethylene terephthalate that is divided (extremely thinned) as island components after removing the polylactic acid of the sea component by alkali treatment or the like It is possible to give a peculiar phenomenon of leaving shrinkage to the resulting ultrafine fiber. For this reason, after becoming an ultrafine fiber, the weave density of the fabric can be increased and further refined.

  This point will be further described. Conventional polyester sea-island type composite fibers generally use polyethylene terephthalate copolymerized with an organic metal salt having a high alkali hydrolysis rate as a sea component, and ordinary polyethylene terephthalate as an island component. The sea component is eluted after the sea-island type composite fiber is knitted into a knitted fabric. The sea-island composite fiber using polyethylene terephthalate copolymerized with this organometallic salt as the sea component has the same heat setting property as the sea component and the island component, so the sea-island component shows uniform shrinkage after spinning / drawing. It will be a thing. In addition, in order to surely elute polyethylene terephthalate copolymerized with an organometallic salt after knitting fabric formation, alkaline treatment alone tends to cause poor elution, and the alkali hydrolysis rate between sea and island components is compared. In order to selectively decompose only the sea component because it is close to the target, the process of eluting the sea component by alkali treatment after treating the knitted fabric with a high-temperature acid in advance and cracking the interface between the sea component and the sheath component Often take. For this reason, the island component after eluting the sea component has already hardly contracted.

  On the other hand, in the case of a sea-island type composite fiber using a polylactic acid polymer for the sea component and a polytrimethylene terephthalate polymer for the island component as in the present invention, first, the difference in heat setting properties between polylactic acid and polytrimethylene terephthalate Is noted. Polylactic acid is heat-set at a relatively low temperature, whereas polytrimethylene terephthalate is not heat-set unless the temperature is higher than that of polylactic acid, and shrinkage remains at a temperature at which polylactic acid can be heat-set. Become. In addition, compared with polyethylene terephthalate copolymerized with organic metal salts of the prior art, polylactic acid is faster in alkali hydrolysis, and the island component polytrimethylene terephthalate has higher alkali hydrolysis than ordinary polyethylene terephthalate. slow. Therefore, when the sea component is eluted as in the prior art described above, the sea component can be stably eluted only by a relatively low temperature alkali treatment without performing a high temperature acid treatment in advance. Even after elution of some polylactic acid, the island component polytrimethylene terephthalate still has shrinkage performance, and after elution of the sea component, the density of the dough can be further densified.

The air permeability of the fabric used as a measure of fineness in the present invention depends on the weaving design such as the weaving structure and the weaving density, but cannot be generally stated. However, the total coverage of the fabric is 1500 or more, and the sea-island composite yarn By shrinking the ultrafine fiber made of polytrimethylene terephthalate after elution of polylactic acid, which is a sea component, by 2% or more, it can be made less than 15 cc / cm ² · s. The total coverage here is calculated by the following equation.
Total cover rate = warp yarn cover rate + width yarn cover rate Warp yarn cover rate = warp yarn density (main / 2.54 cm) × (warp yarn fineness (dtex)) ^1/2
Cover rate of weft yarn = weft yarn density (line / 2.54 cm) × (weft yarn fineness (dtex)) ^1/2
Furthermore, in conventional woven fabrics of polyester-based ultrafine fibers and cellulose-based fibers, the cellulose-based fibers that are woven are greatly damaged by the high-temperature acid treatment before the sea component described above is dissolved, and can withstand practical use. The tear strength is reduced to the extent that it does not. However, by using a polylactic acid polymer as a sea component as in the present invention, such a high-temperature acid treatment is not required, so there is no decrease in strength of the cellulosic fiber, and tear strength that can withstand practical use, An unwoven fabric having a characteristic of tearing strength in the direction using cellulosic fibers of 5N or more can be obtained.

  Due to the combined effect of these polylactic acid and polytrimethylene terephthalate, the machine is excellent in productivity, which is the object of the present invention, has a soft and fine feeling without impairing the excellent texture of cellulosic fibers, and can withstand practical use It is possible to provide a woven fabric with special characteristics.

  The polylactic acid referred to in the present invention is not particularly limited, but preferably has an average molecular weight of 50,000 to 100,000, and more preferably a polylactic acid composed of L-lactic acid having a purity of 95.0% to 99.5%. Lactic acid is preferred. Such polylactic acid can maintain the strength in each production process, and can obtain appropriate biodegradability, so that the environmental load of the waste liquid after elution is small. In addition, copolymerized polylactic acid obtained by copolymerizing other components having ester forming ability in addition to L-lactic acid and D-lactic acid may be used as long as the above-mentioned merits are not impaired.

  Particularly preferable polylactic acid includes polylactic acid, which is a polyester mainly composed of L-lactic acid, and polyglycolic acid, which is a polyester mainly composed of glycolic acid, from the viewpoint of a high melting point and a low refractive index. . “L-lactic acid as a main component” means that 60% by weight or more of the constituent components is made of L-lactic acid, and is a polyester containing D-lactic acid within a range not exceeding 40% by weight. Also good.

  Other components copolymerizable with polylactic acid include glycolic acid, 3-hydroxybutyric acid, 4-hydroxybutyric acid, 4-hydroxyvaleric acid, 6-hydroxycaproic acid and other hydroxycarboxylic acids, ethylene glycol, propylene glycol , Butanediol, neopentyl glycol, polyethylene glycol, glycerin, pentaerythritol and other compounds containing a plurality of hydroxyl groups in the molecule or derivatives thereof, adipic acid, sebacic acid, fumaric acid, terephthalic acid, isophthalic acid, 2, Examples thereof include compounds containing a plurality of carboxylic acid groups in the molecule, such as 6-naphthalenedicarboxylic acid, 5-sodium sulfoisophthalic acid and 5-tetrabutylphosphonium isophthalic acid, or derivatives thereof.

  The average molecular weight of polylactic acid is preferably as high as not exceeding 300,000, more preferable average molecular weight is 50,000 or more, and further preferable average molecular weight is 100,000 or more.

  By setting the average molecular weight to 50,000 or more, fiber strength physical properties at a level that can be practically used can be obtained, and by increasing the average molecular weight to 300,000 or less, the increase in the viscosity of the polymer can be suppressed. The temperature can also be kept low, so that thermal decomposition of the polymer can be prevented and stable spinning can be performed.

  In order to reduce the melt viscosity of polylactic acid, aliphatic polyester polymers such as polycaprolactone, polybutylene succinate, and polyethylene succinate can be used as an internal plasticizer or as an external plasticizer. Furthermore, inorganic fine particles and organic compounds can be added as necessary as matting agents, deodorants, flame retardants, yarn friction reducing agents, antioxidants and coloring pigments.

On the other hand, polytrimethylene terephthalate used as an island component is a polyester obtained using terephthalic acid as the main acid component and 1,3 propanediol as the main glycol component. However, it may contain a copolymer component capable of forming another ester bond at a ratio of 20 mol% or less, preferably 10 mol% or less.
Examples of the copolymerizable compound include dicarboxylic acids such as isophthalic acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid, and sebacic acid, while the glycol component includes, for example, ethylene glycol, diethylene glycol, Examples thereof include butanediol, neopentyl glycol, cyclohexanedimethanol, polyethylene glycol, and polypropylene glycol, but are not limited thereto.

Further, titanium dioxide as a matting agent, silica or alumina fine particles as a lubricant, hindered phenol derivatives as an antioxidant, and coloring pigments can be added as necessary.
Further, the composite ratio of sea component (polylactic acid) / island component (polytrimethylene terephthalate) of the sea-island type composite fiber used in the present invention is preferably from the viewpoint of stability of the composite form, yarn production and productivity. 10/90 to 50/50. The composite ratio of the sea component and the island component in the present invention refers to the area ratio of the sea component and the island component in the cross section of the sea-island type composite fiber. The area ratio can be calculated from a cross-sectional photograph of the sea-island composite yarn. When the composite ratio of the sea component is less than 10%, a composite abnormality occurs, resulting in poor partitioning, or even when the composite form is normal, poor splitting due to poor dissolution of the sea component is obtained, and a good texture is obtained. There are times when you can't. On the contrary, when the composite ratio of the sea component exceeds 50%, productivity is lowered, which is not preferable. The more preferable composite ratio of the sea component / island component of the sea-island type composite fiber is 15/85 to 40/60.

  Moreover, in the sea-island type composite fiber used in the present invention, the single fiber fineness of the island component after removing the sea component is preferably 0.01 to 0.5 dtex. This is to obtain a soft texture that does not impair the texture of the cellulosic fiber of the union partner, and to improve the insufficient color development when made into ultrafine fibers, and the single fiber fineness is less than 0.01 dtex. If it is, the accuracy of each single fiber is lowered, so that a quality problem is likely to occur. On the other hand, if the single fiber fineness is larger than 0.5 dtex, the desired soft feeling cannot be obtained, which is not desirable. A more preferable single fiber fineness is 0.05 to 0.2 dtex.

  The sea component removal treatment is performed after weaving using the above-mentioned sea-island type composite fibers and cellulosic fibers. For the weaving, a known weaving method can be employed using a known weaving machine.

  The removal treatment of the sea component can employ a known removal treatment, but it can be preferably carried out in an alkaline solution of 10 to 100 g / l, more preferably 15 to 80 g / l. What is necessary is just to process at the temperature of 60-120 degreeC normally using a sodium hydroxide solution as an alkaline solution.

  After the removal of the sea component, a known dyeing method of a mixed product of cellulose and polyester can be employed and dyeing can be performed, and then a finishing set can be performed by a known method to obtain a woven fabric.

  The cross-sectional shape of the sea-island type composite fiber used in the present invention may be an irregular cross section such as flat, hollow and triangular in addition to a round cross section. Moreover, the island component may be completely covered with the sea component on the fiber surface of the sea-island composite fiber, or the island component may be partially exposed. Furthermore, the cross-sectional shape of the island component after the sea component is removed may be an irregular cross-section such as a flat shape or a triangle in addition to the round cross-section.

  In addition, the sea-island type composite fiber used in the present invention is, for example, an apparatus shown in FIG. 3 described in Japanese Patent Laid-Open No. 57-47938 or FIG. 2 described in Japanese Patent Laid-Open No. 57-82526. It can be used as a suitable example, and the polymer as the sea component and the polymer as the island component are filtered through separate polymer introduction pipes in the respective filtration chambers, and then into the mouthpiece pores via the mouthpiece inflow holes. It can be obtained by using a composite spinneret that can associate (join) in a split flow state.

  In producing the sea-island type composite fiber used in the present invention, any known method such as a method in which spinning and drawing steps are continuously performed, a method in which the yarn is once wound as an undrawn yarn and then drawn, or a high-speed yarn making method is used. Can also be applied. Furthermore, the sea-island type composite fiber used in the present invention may be subjected to yarn processing such as false twisting or air entanglement as necessary.

  The union woven fabric of the present invention is suitably used for women's apparel utilizing its texture, sportswear or casual wear utilizing its precision.

  Hereinafter, the present invention will be described in more detail with reference to examples. In addition, each characteristic value in an Example was calculated | required with the following method.

A. Intrinsic viscosity [η]
A sample of 0.10 g was dissolved in 10 ml of orthochlorophenol and measured using an Ostwald viscometer at a temperature of 25 ° C.

B. Air permeability: Measured according to JIS L1096 (Method A; Frazier method).

C. Tear strength Measured according to JIS L1096 (D method; pendulum method). In the present invention, for example, the tear strength in the warp direction is defined as the tear strength in the direction of tearing the warp yarn.

D. Color developability The sample obtained in Comparative Example 2 was used as a reference sample (evaluated to have poor color developability), and a comparative evaluation was performed.

Example 1
Tetrabutyl titanate was used as a catalyst in 19.4 kg of dimethyl terephthalic acid and 15.2 kg of 1,3-propanediol, and the ester exchange reaction was carried out while distilling methanol at a temperature of 140 ° C to 230 ° C. Polymerization was performed for 3.5 hours under the condition of a constant temperature of 1.5 to obtain polytrimethylene terephthalate having an intrinsic viscosity [η] of 1.1. Polypropylene terephthalate obtained by the above production method is used as an island component, poly-L-lactic acid having an optical purity of 98.0% is used as a sea component, and the number of island components is 8 at a composite ratio of sea / island = 30/70. Using a sea-island type compound base with 36 holes, this is taken up by a first hot roller heated to 55 ° C. at a take-up speed of 2700 m / min. Instead, the film was drawn on a second hot roller heated to 150 ° C. at a speed of 4300 m / min, drawn and heat set, and then wound at 4072 m / min to obtain a drawn yarn of 72 dtex-36 filament. The obtained drawn yarn had a strength of 3.5 cN / dtex and a boiling water shrinkage of 11.4%.

84dtex-24 filament viscose rayon filament made from bamboo as warp yarn, and the above drawn yarn obtained as weft yarn as double yarn, warp yarn density 169 (pieces / 2.54cm), weft yarn density 88 Weaving with a 2/1 twill structure (main / 2.54 cm), then refining at 95 ° C. with a softener and drying at 130 ° C., followed by 80 ° C. warm water with a sodium hydroxide concentration of 30 (g / l) For 50 minutes to elute the polylactic acid as a sea component to obtain a woven fabric made of ultrafine fibers (multifilaments). At this stage, the obtained fabric sample was cut and the cross section of the fabric was observed with a scanning electron microscope (SEM) to confirm that the sea component was completely eluted. Subsequently, after presetting at a temperature of 160 ° C., dyed at 120 ° C. using a disperse dye using a liquid dyeing machine, dyed at 98 ° C. in a direct dye bath at a lower temperature, and at a temperature of 140 ° C. Finished and set. The obtained woven fabric is a woven fabric having a warp yarn density of 204 (lines / 2.54 cm) and a weft yarn density of 98 (lines / 2.54 cm). The tear strength in the warp direction is 7.4 N and the weft direction is 8. 2N, air permeability was 5.2 cc / cm ² · s, high mechanical strength and precision, soft touch and excellent color development.

(Comparative Example 1)
Example 5 Using polyethylene terephthalate having an intrinsic viscosity [η] of 0.56 copolymerized with 4.5 mol% of 5-sodium sulfoisophthalic acid as the sea component, and using polytrimethylene terephthalate used in Example 1 as the island component A drawn yarn was obtained in the same manner as in Example 1 at a spinning temperature of 280 ° C. using the same die as in No. 1 and a composite spinning machine. The obtained drawn yarn was 72 dtex-36 filament, the strength was 2.3 cN / dtex, and the boiling water shrinkage was 9.0%. The same rayon filament as in Example 1 is used as warp yarn, and the obtained drawn yarn is used as a double yarn for warp yarn. The warp yarn density is 169 (pieces / 2.54 cm), and the warp yarn density is 88 (pieces / 2. 54 cm) of 2/1 twill fabric, weaved and scoured, treated with sodium hydroxide 30 (g / l) in 80 ° C warm water for 50 minutes to try to elute the copolyester of the sea component, and treated with alkali A sample of the subsequent fabric was cut and the cross section of the fabric was observed with a scanning electron microscope (SEM). As a result, it was confirmed that the sea component did not completely elute and was poorly divided. For this reason, the obtained raw machine was first acid-treated for 30 minutes under hot water conditions of acetic acid 1 (g / l) concentration at 130 ° C., neutralized / washed, and again at 80 ° C. of sodium hydroxide 30 (g / l) concentration. Attempting to elute the copolyester of the sea component by treating in warm water for 50 minutes, cutting the sample of the fabric after alkali treatment and observing the cross section of the fabric with a scanning electron microscope (SEM), the sea component was completely eluted. I confirmed that Subsequently, after presetting at a temperature of 160 ° C., dyeing was performed in the same manner as in Example 1, and finishing setting was performed at a temperature of 140 ° C. The obtained woven fabric was a woven fabric having a warp yarn density of 178 (lines / 2.54 cm) and a weft yarn density of 96 (lines / 2.54 cm). Despite excellent color development, the tear strength in the vertical direction is 2.8 N, the horizontal direction is 7.6 N, and it cannot be used practically, and the air permeability is 17 cc / cm ² · s, which is less precise. .

(Comparative Example 2)
Using polyethylene terephthalate with intrinsic viscosity [η] of 0.56 copolymerized with 4.5 mol% of 5-sodiumsulfoisophthalic acid as sea component, and using polyethylene terephthalate without copolymerizing third component as island component A drawn yarn was obtained in the same manner as in Example 1 at a spinning temperature of 280 ° C. using the same die and composite spinning machine as in Example 1. The obtained drawn yarn was 72 dtex-36 filament, the strength was 2.5 cN / dtex, and the boiling water shrinkage was 8.0%. The obtained drawn yarn was made into a double yarn in the same manner as in Example 1 and used for the weft yarn. The warp yarn density was 169 (lines / 2.54 cm), and the weft yarn density was 88 (lines / 2.54 cm). Weaving the woven fabric, scouring, and then treating in 50 ° C warm water with a sodium hydroxide concentration of 30 (g / l) for 50 minutes to try to elute the copolyester of the sea component, cut the sample of the woven fabric after alkali treatment The cross section of the fabric was observed with a scanning electron microscope (SEM), and it was confirmed that the sea component was not completely eluted. For this reason, the acid treatment was performed in the same manner as in Comparative Example 1, and the treatment was again carried out for 50 minutes in 80 ° C. warm water having a sodium hydroxide concentration of 30 (g / l) to try to elute the sea component copolymer polyester. It eluted completely. Subsequently, after presetting at a temperature of 160 ° C., dyeing was performed in the same manner as in Example 1, and finishing setting was performed at a temperature of 140 ° C. The obtained woven fabric was a woven fabric having a warp yarn density of 172 (lines / 2.54 cm) and a weft yarn density of 97 (lines / 2.54 cm). The obtained unwoven fabric is inferior in color developability, has a tear strength of 2.7 N in the vertical direction and 7.8 N in the horizontal direction and cannot be practically used, and the air permeability is 21 cc / cm ² · s and is not as precise. It was a thing.

(Comparative Example 3)
The polytrimethylene terephthalate obtained in Example 1 was rotated at a spinning temperature of 260 ° C. using a round hole die having 72 holes on a single component spinning machine, and the take-up speed was 2700 m / min to 60 ° C. in the same manner as in Example 1. Taken up to the heated first hot roller, drawn and drawn by a second hot roller heated to 180 ° C. at a speed of 4300 m / min without winding once, and a drawn yarn of 72 dtex-72 filament was obtained. It was. The obtained drawn yarn had a strength of 4.8 cN / dtex and a boiling water shrinkage of 8.6%. The obtained drawn yarn was made into a double yarn in the same manner as in Example 1 and used for the weft yarn. The warp yarn density was 169 (lines / 2.54 cm), and the weft yarn density was 88 (lines / 2.54 cm). The woven fabric was woven, scoured, preset at a temperature of 160 ° C., dyed in the same manner as in Example 1, and finish-set at a temperature of 140 ° C. The obtained woven fabric was a woven fabric having a warp yarn density of 176 (lines / 2.54 cm) and a weft yarn density of 97 (lines / 2.54 cm). The obtained unwoven fabric was excellent in color development, tear strength in the vertical direction was 7.7 N, and 9.8 N in the horizontal direction, and was able to withstand practical use. The air permeability was 28 cc / cm ² · s and the precision was low.

(Example 2)
The same sea-island type composite fiber as used in Example 1 is used for warp yarn, 84 dtex-20 filament triacetate filament is used for the weft yarn, warp yarn density 158 (pieces / 2.54 cm), weft yarn density 120 (pieces) /2.54cm) plain weave, scoured at 95 ° C with a softener, treated with warm water at 80 ° C with sodium hydroxide 30 (g / l) concentration for 50 minutes, and polylactic acid as a sea component of warp yarn Was eluted to obtain a woven fabric. Subsequently, after presetting at a temperature of 160 ° C., dyeing / reduction washing was performed with a disperse dye at a temperature of 120 ° C. using a liquid dyeing machine, and a temperature finishing set at 140 ° C. was performed. The obtained woven fabric is a woven fabric with a warp yarn density of 166 (lines / 2.54 cm) and a weft yarn density of 138 (lines / 2.54 cm), and its tear strength in the warp direction is 7.1 N. The direction was 7.2 N, and the air permeability was 10.5 cc / cm ² · s, which was excellent in mechanical properties and precision.

  The unwoven fabric composed of polytrimethylene terephthalate fiber and cellulosic fiber of the present invention has an unprecedented excellent texture, soft feeling and excellent color development and precision, and is widely used in women's fabrics, sports fabrics, etc. It is usable and useful.

Claims (4)

  A warp yarn or a weft yarn is a multi-filament made of polytrimethylene terephthalate having a single fiber fineness of 0.01 to 0.5 dtex, and the other is composed of a cellulose-based multifilament, the cellulose-based multifilament The unwoven fabric is characterized in that the tear strength of the fabric in the direction of using is 5N or more. The unwoven fabric according to claim 1, wherein the air permeability is less than 15 cc / cm ² · s.   The unwoven fabric according to claim 1 or 2, wherein the multifilament made of polytrimethylene terephthalate is a multifilament obtained by eluting a sea component of a sea-island composite fiber. The sea component polymer is composed of polylactic acid and the island component polymer is composed of polytrimethylene terephthalate, and the sea component / island component composite ratio is 10/90 to 50/50, A sea-island type composite fiber having a single fiber fineness of 0.01 to 0.5 dtex of island components obtained by dissolution treatment is used for either warp yarn or weft yarn, and cellulosic multifilament is used for the other. A process for producing an unwoven fabric, characterized in that, after weaving, polylactic acid is eluted by dissolution treatment.