JP2008150726A - Combined filament yarn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combined filament yarn that has an excellent feeling, swelling feeling and color development in forming a fabric and comprises a cellulose ester fiber (A) and a polyester-based fiber (B) dyeable with a dye under normal pressure. <P>SOLUTION: The combined filament yarn comprises at least the cellulose ester fiber (A) having a boiling water shrinkage percentage of 0.2-5% and the polyester-based fiber (B) dyeable with a dye under normal pressure, having a boiling water shrinkage percentage of 10-35% and satisfies formula (I): [the boiling water shrinkage percentage of the polyester-based fiber (B) dyeable with a dye under normal pressure] - [the boiling water shrinkage percentage of the cellulose ester fiber (A)] ≥5% but ≤30%. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mixed yarn having excellent mechanical properties, good swellness, and high colorability when formed into a fabric.

  Cellulose-based materials such as cellulose esters and cellulose ethers have recently attracted a great deal of attention as biomass-based materials that are most produced on the earth and as biodegradable materials in natural environments. In addition, since the cellulosic material has a low refractive index, it also has the advantage of being excellent in vivid coloring when it is made into a fiber.

  Cellulosic fibers can be obtained by a solution spinning method or a melt spinning method. However, since the obtained fibers have a low boiling water shrinkage ratio, there is a problem that a swelling feeling cannot be obtained when the fabric is made. In order to solve such problems, a composite entangled yarn comprising cellulose triacetate fiber and polyester fiber having a high boiling water shrinkage ratio (see Patent Document 1), a cellulose-based multifilament yarn and a copolyester system having a high boiling water shrinkage percentage. A composite fabric using a multifilament (see Patent Document 2) and a mixed yarn composed of a fiber mainly composed of cellulose ester and polyhydroxycarboxylic acid (see Patent Document 3) have been proposed.

  Since both polyester fibers and cellulose ester fibers are dyed with disperse dyes, they are generally dyed in the same bath. Polyester with a dense internal structure is difficult to dye because dye molecules are difficult to diffuse, and when dyeing composite yarns containing polyester with good color development, it is necessary to adopt a high-temperature and high-pressure dyeing method performed at a dyeing temperature of 120 to 130 ° C. There is.

  When blended with the above-mentioned blended yarn and fibers such as wool, silk, cotton, rayon, cupra, nylon, acrylic, etc., at the dyeing temperature of 120 to 130 ° C. which is the dyeing condition of polyester, the blending partner This is not preferable because the physical properties of the fibers are deteriorated. In addition, when dyed at normal pressure so as not to cause deterioration of physical properties, the dyeability of the polyester fiber is not sufficient, and a shaded color difference appears in the dyed fabric, which causes irritation and significantly improves the quality of the resulting fabric. There was a problem of lowering.

  In addition, even when the mixed fiber is used alone, the strength and elongation of fibers made of cellulose fatty acid ester are greatly increased so that they cannot be used as fibers when dyeing at high temperature and high pressure at a dyeing temperature of 120 to 130 ° C. There is a problem of lowering. Incidentally, the dyeing temperature (Example) of cellulose acetate propionate fiber, which is the cellulose fatty acid ester fiber of Patent Document 4, is 90 ° C., and the dyeing temperature (Comparative Example) of polyethylene terephthalate is 130 ° C.

In other words, the existing mixed fiber of polyester fiber and cellulose ester fiber has high dyeability at normal pressure, and there is no mixed yarn that provides a feeling of swell by having a sufficient difference in shrinkage of boiling water. Currently.
Japanese Patent Laid-Open No. 11-350270 (first page) Japanese Patent Laid-Open No. 10-72741 (first page) JP 2004-250798 A (first page) JP 2004-169242 A (pages 6 to 8)

  The object of the present invention is to solve the above-mentioned problems of the prior art, cellulose ester fiber having a sufficient difference in boiling water shrinkage, excellent texture, good swell, and high colorability when made into a fabric Another object of the present invention is to provide a blended yarn comprising dyeable polyester fiber with atmospheric pressure dye.

  The above-described problems of the present invention are that the cellulose fatty acid ester fiber (A) has a boiling water shrinkage of 0.2 to 5%, and the atmospheric dye-dyeable polyester fiber having a boiling water shrinkage of 10 to 35% ( It can be solved by a mixed yarn characterized in that it contains at least B) and satisfies the following formula (I).

  (I) 5% ≦ boiling water shrinkage of atmospheric dye-dyeable polyester fiber (B) −boiling water shrinkage of cellulose ester fiber (A) ≦ 30%

  ADVANTAGE OF THE INVENTION According to this invention, the mixed yarn which is excellent in a swell feeling and coloring property than the conventional mixed yarn and can be dye | stained by a normal pressure can be obtained. Therefore, a fiber structure such as a fabric using the mixed yarn has a good swell feeling and color developability and can be suitably used particularly for clothing.

  Hereinafter, the mixed yarn of the present invention will be described in detail.

  The mixed yarn in the present invention is composed of a cellulose ester fiber (A) and a normal pressure dyeable polyester fiber (B). The difference in boiling water shrinkage {boiling water shrinkage (B) -boiling water shrinkage (A)} between the cellulose ester fiber (A) and the atmospheric dye-dyeable polyester fiber (B) is 5% or more and 30% or less. It is. If the difference in boiling water shrinkage is 5% or more, the desired swelling feeling can be obtained. The difference in boiling water shrinkage is more preferably 7% or more, and further preferably 10% or more. On the other hand, if the difference in boiling water shrinkage is 30% or less, it is preferable because no shrinkage or staining spots occur due to the shrinkage being too different. The difference in boiling water shrinkage is more preferably 20% or less, and further preferably 15% or less.

  The cellulose ester fiber (A) of the present invention is mainly composed of a cellulose ester. A fiber containing cellulose ester as a main component is preferable because excellent color developability unique to cellulose ester can be obtained.

  The cellulose ester in the present invention means one in which at least a part of three hydroxyl groups per glucose unit of cellulose is substituted with an ester bond. Of the three hydroxyl groups per glucose unit of cellulose, cellulose esters in which two or more are substituted with ester bonds are preferred, and the remaining hydroxyl groups are not substituted, or are substituted with carbamate or ether bonds Is preferably used, but is not limited thereto.

  The cellulose ester of the present invention is preferably a cellulose ester in which at least a part of three hydroxyl groups per glucose unit of cellulose is an acyl group having 3 to 18 carbon atoms. When at least a part is an acyl group having 3 to 18 carbon atoms, a more flexible fiber can be obtained.

  Specific examples of the cellulose ester at least partially substituted with an acyl group having 3 to 18 carbon atoms include cellulose acetate propionate, cellulose propionate, cellulose acetate butyrate, and cellulose butyrate. Among them, cellulose acetate propionate in which an acetyl group having 2 acyl groups and a propionyl group having 3 acyl groups are bonded to cellulose, and an acetyl group having 2 acyl groups in cellulose And a fiber made of cellulose acetate butyrate having a butyryl group having an acyl group of 4 carbon atoms bonded thereto is particularly preferably used in the present invention because it has moderate hygroscopicity and good mechanical properties.

When cellulose acetate propionate and / or cellulose acetate butyrate is used as the cellulose ester, the total substitution degree of cellulose ester (acetyl substitution degree + acyl substitution degree) preferably satisfies the following formula (I). That is, if the cellulose ester total substitution degree (acetyl substitution degree + acyl substitution degree) is in the range of 2.5 or more and 3.0 or less, the heat fluidity at the time of melt molding is good, thereby preventing the coloring of the fibers. This is preferable because fibers having good color tone can be obtained. The total degree of cellulose ester substitution is more preferably 2.6 or more and 2.9 or less.
(I) 2.5 ≦ acetyl substitution degree + acyl substitution degree ≦ 3.0
The degree of acetyl substitution and the degree of acyl substitution preferably satisfy the following formulas (II) and (III) in order to have a high heat softening temperature and appropriate hygroscopicity even in the case of fibers and fabrics.
(II) 1.5 ≦ acetyl substitution degree ≦ 2.5
(III) 0.5 ≦ acyl substitution degree ≦ 1.5
The weight average molecular weight (Mw) of the cellulose ester in the present invention is preferably 50,000 to 250,000. A weight average molecular weight (Mw) of 50,000 or more is preferable because the strength of the cellulose ester fiber is increased. The weight average molecular weight (Mw) is more preferably 60,000 or more, and still more preferably 80,000 or more. A weight average molecular weight (Mw) of 250,000 or less is preferable because flexible fibers can be obtained. The weight average molecular weight (Mw) is more preferably 220,000 or less, still more preferably 200,000 or less. The weight average molecular weight (Mw) is a value calculated by GPC measurement, and will be described in detail in Examples.

  In the present invention, it is desirable from the viewpoint of the spinning environment that the fiber containing cellulose ester as a main component is produced by a melt spinning method from the viewpoint of the spinning efficiency and that no harmful chemicals need to be used during production. In applying the melt spinning method, a plasticizer can be contained in addition to the cellulose ester. As the plasticizer, known plasticizers can be used as appropriate, but polyhydric alcohol plasticizers having good compatibility with cellulose esters are preferable, such as ester compounds having a glycerin skeleton, polyalkylene glycols, caprolactone compounds, etc. Is particularly preferably used, but is not particularly limited.

  Specific ester compounds having a glycerol skeleton include glycerol acetate stearate, glycerol acetate palmitate, glycerol acetate laurate, glycerol acetate caprate, glycerol acetate oleate, diglycerol tetraacetate, diglycerol tetrapropionate, di Examples thereof include glycerin tetrabutyrate, diglycerin tetracaprylate and diglycerin tetralaurate.

  Specific examples of the polyalkylene glycol include polyethylene glycol and polypropylene glycol.

  These plasticizers can be used alone or in combination.

  It is important that these plasticizers are less likely to volatilize during melt spinning, and the molecular weight is preferably 200 or more. However, when the molecular weight is too high, the plasticizing efficiency is lowered, and the compatibility with the cellulose ester may be poor. The molecular weight of the plasticizer is more preferably 300 to 5000, and most preferably 400 to 2000.

  The amount of the plasticizer is preferably in the range of 5 to 25% by weight with respect to the whole composition composed of the cellulose ester and the plasticizer from the viewpoint that the obtained fiber maintains the properties as the cellulose ester. The amount of the plasticizer is more preferably 10% by weight or more, and further preferably 15% by weight or more. The amount of plasticizer is preferably 20% by weight or less.

  The cellulose ester fiber of the present invention preferably contains a phosphite-based anti-coloring agent. This is because when the phosphite-based anti-coloring agent is contained, the anti-coloring effect is very remarkable, and the color tone of the resulting fiber is improved.

  Specific examples of the phosphite coloration inhibitor include tetrakis (2,4-di-t-butylphenyl) [1,1-biphenyl] -4,4′-diylbisphosphonite, tetrakis (2,6-di). -T-butylphenyl) [1,1-biphenyl] -4,4'-diylbisphosphonite, tetrakis (2,6-di-t-butylphenyl-4-methyl) [1,1-biphenyl] -4 , 4′-diylbisphosphonite, bis (2.6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, bis (2-tert-butyl-4-cumylphenyl) pentaerythritol diphosphite, Bis (4-t-butyl-2-cumylphenyl) pentaerythritol diphosphite, bis (2.6-di-t-butyl-4-ethylphenyl) pentaerythritol Over diphosphite, bis (2,4-di -t- butyl-6-methylphenyl) pentaerythritol diphosphite are preferred.

  The blending amount of the phosphite colorant is preferably in the range of 0.005 to 0.5% by weight with respect to the cellulose ester composition. By setting the blending amount to 0.005% by weight or more, the coloring of the cellulose ester fiber can be suppressed. The blending amount of the phosphite anti-coloring agent is more preferably 0.01% by weight or more, and still more preferably 0.05% by weight or more. On the other hand, when the blending amount of the phosphite-based anti-coloring agent is 0.5% by weight or less, deterioration of the cellulose ester fiber can be suppressed, and the fiber characteristics are improved. The blending amount of the phosphite anti-coloring agent is more preferably 0.3% by weight or less, and still more preferably 0.2% by weight or less.

  In addition to the components described above, the cellulose ester fiber of the present invention includes other resins containing fatty acid esters having different acyl groups, and various additives such as matting agents, deodorants, defoamers, and color adjusters. Including additives such as flame retardants, yarn friction reducers, ultraviolet absorbers, infrared absorbers, crystal nucleating agents, antioxidants, color pigments, electrostatic agents, antibacterial agents, flame retardants and lubricants It does not matter.

The boiling water shrinkage of the cellulose ester fiber (A) of the present invention is 0.2 to 5%.
If the boiling water shrinkage is 5% or less, it will not shrink greatly during hydrothermal treatment and will occupy the outer periphery of the mixed yarn structure, and the good texture of cellulose ester fibers is a characteristic of the mixed yarn structure. It is preferable because it is expressed. Further, if it is 0.2% or more, it is preferable because the fabric does not become paper-like due to insufficient shrinkage. The boiling water shrinkage of the fiber mainly composed of cellulose ester is preferably 1.0% or more, more preferably 2.0% or more, and further preferably 3.0% or more. Moreover, 4.0% or less is preferable.

  The single fiber fineness of the cellulose ester fiber (A) of the present invention is preferably 0.5 to 20 dtex. If the single fiber fineness is 0.5 dtex or more, a clear and deep color developability can be obtained by dyeing. The single fiber fineness is more preferably 1 dtex or more, and further preferably 1.3 dtex or more. On the other hand, if the single fiber fineness is 20 dtex or less, flexibility can be obtained. The single fiber fineness is preferably 15 dtex or less, more preferably 10 dtex or less, and further preferably 5 dtex or less. It is preferable to make the single fiber fineness of the cellulose ester fiber (A) smaller than that of the atmospheric dye-dyeable polyester fiber (B) because a more excellent swell feeling can be obtained. The cellulose ester fiber (A) may be a monofilament or a multifilament as long as it has the single fiber fineness described above, and may be a short fiber (staple) in addition to the long fiber.

  Although the fiber physical property of the cellulose ester fiber (A) of the present invention is not particularly limited, the strength is 0.5 to 2.0 cN / dtex, the elongation from the viewpoint of process passability in higher processing. Is preferably 8 to 50%. When the elongation is 8% or more, the occurrence of fluff and yarn breakage is reduced in higher processing steps such as weaving and knitting. The elongation is more preferably 10% or more, and further preferably 15% or more. On the other hand, if the elongation is 50% or less, the change in the size of the fabric is small. The elongation is more preferably 40% or less, and further preferably 35% or less.

  The cellulose ester fiber (A) of the present invention is not particularly limited with respect to the cross-sectional shape of the fiber, and may be a perfect circular circular cross-section, and may be a multilobal shape, a flat shape, an elliptical shape, a W shape, S Different cross-section yarns such as a letter shape, an X shape, an H shape, a C shape, a paddle shape, a cross beam shape, and a hollow shape may be used.

  The normal pressure dye-dyeable polyester fiber (B), which is the other component constituting the mixed yarn of the present invention, is a polyester fiber that can be dyed under normal pressure.

  The atmospheric dye-dyeable polyester fiber (B) in the present invention is a low-temperature dyeing type disperse dye, for example, Sumikaron Red SE-RPD, a dye usage amount of 3% owf, a bath ratio of 100 times, and a pH 6 dyeing bath. In particular, it refers to a fiber having a dye exhaustion rate (according to the following formula II) of 90% or more after dyeing at 100 ° C. for 60 minutes. Details of the measurement method are described in Examples.

Further, the difference between the dye exhaust rate at 100 ° C. (100 ° C.) and the dye exhaust rate at 120 ° C. (120 ° C.) of the normal pressure dyeable polyester fiber (B) represented by the following formula (III) is It is preferably 5% or less, and more preferably 3% or less.
(III) Difference in dye exhaustion rate = dye exhaustion rate (120 ° C.) − Dye exhaustion rate (100 ° C.)
The polyester in the present invention refers to those having alkylene terephthalate as the main repeating unit. Polyethylene terephthalate, polytrimethylene terephthalate and polybutylene terephthalate are preferred, and polyethylene terephthalate is the most versatile and preferred. Further, a part of the diol component and acid component may be substituted with other copolymerizable components.

  The normal pressure dye-dyeable polyester fiber (B) used in the present invention is preferably a normal pressure disperse dyeable polyester fiber or a normal pressure cationic dyeable polyester fiber.

  Since the normal pressure disperse dyeable polyester fiber exhibits dyeability of the normal pressure disperse dye, it is preferable to copolymerize polyethylene glycol having an average molecular weight of 500 to 4000 as the third component. When the average molecular weight is 500 or more, it is possible to prevent a part of polyethylene glycol added during polymerization of the polyester from scattering under the reaction conditions of high temperature and reduced pressure, thereby preventing the copolymerization ratio of polyethylene glycol in the polyester from becoming constant. Thus, there is obtained a fabric in which the obtained polyester raw yarn has a small variation in the strength and shrinkage characteristics and has no dyeing spots or the like at the time of dyeing. In addition, since low molecular weight polyethylene glycol having a molecular weight of 500 or more may have a smaller number of moles of copolymerization than those having a low molecular weight, the decrease in softening point of the obtained polyester can be suppressed, and the final product obtained The quality is improved.

  On the other hand, when polyethylene glycol having an average molecular weight of 4000 or less is used, a high molecular weight material that does not copolymerize in the polyester is reduced, so that not only the dyeability is improved, but also the dye when the fabric after dyeing is heat-treated is used. Bleed out, fading fastness, and various dyeing fastnesses can be suppressed.

  The copolymerization rate of polyethylene glycol is preferably 5 to 10% by weight. If the copolymerization ratio of polyethylene glycol is 5% by weight or more, the dyeability is sufficient and good atmospheric pressure dyeability can be imparted. If it is 10% by weight or less, physical properties such as light fastness and alkali resistance can be improved while maintaining good dyeability, and the quality of the final product becomes good.

  In addition, since polyethylene glycol is copolymerized with polyester, oxidation resistance tends to be lower than that of ordinary polyester fiber, so an antioxidant may be added to the polyester to improve this. Preferably done.

  As a preferable antioxidant, for example, a hindered phenol compound which is a phenol derivative having a substituent having a steric hindrance at a position adjacent to a phenolic hydroxyl group can be exemplified.

  In the case of blending the hindered phenol compound into the polyester fiber, the blending amount is preferably 0.05 to 1% by weight with respect to the polyester fiber from the viewpoint of oxidation resistance and prevention of the nozzle nozzle stain.

  The normal pressure cationic dye-dyeable polyester fiber exhibits a normal pressure cationic dye dyeability, and therefore, it is preferable to copolymerize 5-sodium sulfoisophthalic acid and / or adipic acid as the third component. Copolymerization of 5-sodium sulfoisophthalic acid is preferable because dyeability when a cationic dye is used is preferable, and copolymerization of adipic acid is preferable because dyeability at normal pressure is improved.

  The copolymerization rate of 5-sodium sulfoisophthalic acid is preferably 0.8 to 4.0 mol%. It is preferable that the amount is 0.8 mol% or more because dyeability of the cationic dye is improved, and that the amount is 4.0 mol% or less because good fiber strength is maintained. It is preferable that it is 1.5-4.0 mol%, and it is more preferable that it is 2.0-3.0 mol%.

The copolymerization ratio of adipic acid is preferably 2 to 17 mol%. When it is 2 mol% or more, it is preferable that the dyeability at normal pressure is improved, and when it is 17 mol% or less, a decrease in the glass transition point of the fiber can be suppressed. Is preferable because it becomes better.
More preferably, it is 2-7 mol%, and it is further more preferable that it is 3-6 mol%.

  In addition, the atmospheric dye-dyeable polyester fiber (B) used in the present invention has various additives such as a matting agent, a deodorant, an antifoaming agent, and the like within the scope of achieving the object of the present invention. Color additives, flame retardants, yarn friction reducers, ultraviolet absorbers, infrared absorbers, crystal nucleating agents, antioxidants, color pigments, electrostatic agents, antibacterial agents, additives such as flame retardants and lubricants May be included.

  The normal pressure dye-dyeable polyester fiber (B) of the present invention has a boiling water shrinkage of 10 to 35%. If the boiling water shrinkage is 35% or less, the fabric will not be hardened due to significant shrinkage. On the other hand, if it is 10% or more, sufficient shrinkage occurs during the hot water treatment, and it occupies the inner layer as a mixed fiber structure, and conversely, the cellulose ester fiber is pushed out to the outer periphery, and a good texture is mixed. Appears as a characteristic of the fiber structure. The boiling water shrinkage of the normal pressure dyeable polyester fiber (B) is preferably 12% or more, more preferably 15% or more, and further preferably 17% or more. Moreover, 30% or less is preferable, 25% or less is more preferable, and 20% or less is further more preferable.

  The method for imparting high shrinkage to the normal dye dyeable polyester fiber is not particularly limited, but there is a method for imparting high shrinkage to the fiber by the drawing conditions of the polyester undrawn yarn and / or the copolymerization component of the polyester. Preferably employed.

  In the present invention, when the normal pressure dyeable polyester unstretched yarn is stretched, the stretching temperature is preferably a glass transition temperature or higher and 110 ° C. or lower. In the present invention, the stretching temperature means the preheating temperature of the yarn immediately before stretching, and in the case of a hot roller stretching machine, it indicates the first hot roller temperature just before stretching. It is preferable that the stretching temperature is not less than the glass transition temperature and not more than 110 ° C. because the stretching becomes uniform. More preferably, it is 80-90 degreeC. The glass transition temperature is a PET chip measured using DSC 7 manufactured by Perkin Elmer Co., with a sample amount of 10 mg and a heating rate of 16 ° C./min. In the present invention, the heat setting temperature is preferably room temperature or higher and 130 ° C. or lower. The heat setting temperature means the heat treatment temperature of the yarn after drawing, and in the case of a hot roller drawing machine, it indicates the second hot roller temperature after drawing. By setting the heat setting temperature to room temperature or higher, the shrinkability of the fibers can be suppressed, and the dimensional stability when made into a fabric is improved, which is preferable. 40 degreeC or more is more preferable, and 60 degreeC or more is further more preferable. By making the heat setting temperature lower than 130 ° C., crystallization of the drawn yarn does not proceed, so that the oriented amorphous molecular chains are not sufficiently fixed, and high shrinkage can be imparted to the fiber. Preferably it is 110 degrees C or less, More preferably, it is 100 degrees C or less, More preferably, it is 90 degrees C or less.

  In the present invention, when high shrinkability is imparted to the atmospheric dye-dyeable polyester fiber by the polyester copolymerization component, a compound having a bulky structure can be copolymerized with the polyester. It is preferable to use isophthalic acid and / or 2,2-bis (4- (2-hydroxyethoxy) phenyl) propane as the copolymerization component.

  The single fiber fineness of the atmospheric dye-dyeable polyester fiber (B) of the present invention is preferably 0.5 to 20 dtex. If the single fiber fineness is 0.5 dtex or more, a clear and deep color developability can be obtained by dyeing. The single fiber fineness is more preferably 1 dtex or more, and further preferably 1.3 dtex or more. On the other hand, if the single fiber fineness is 20 dtex or less, flexibility can be obtained. The single fiber fineness is more preferably 15 dtex or less, and further preferably 10 dtex or less. It is preferable to make the single fiber fineness of the cellulose ester fiber (A) smaller than that of the atmospheric dye-dyeable polyester fiber (B) because a more excellent swell feeling can be obtained. The cellulose ester fiber (A) may be a monofilament or a multifilament as long as it has the single fiber fineness described above, and may be a short fiber (staple) in addition to the long fiber.

  The fiber physical properties of the normal dye-dyeable polyester fiber (B) of the present invention are not particularly limited, but the strength is preferably 3.0 to 6.0 cN / dtex. The elongation is preferably 8 to 50%. It is preferable for the strength to be 3.0 cN / dtex or more because there is no problem during yarn processing such as twisting and entanglement. More preferably, the strength is 3.5 cN / dtex or more. In addition, it is generally difficult to obtain a polyester fiber having a strength exceeding 6.0 cN / dtex or more. The elongation of the normal pressure dyeable polyester fiber (B) is preferably 8 to 50%. When the elongation is 8% or more, the occurrence of fluff and yarn breakage is reduced in higher processing steps such as weaving and knitting. The elongation is more preferably 10% or more, and further preferably 15% or more. On the other hand, if the elongation is 50% or less, the change in the size of the fabric is small. The elongation is more preferably 40% or less, and further preferably 35% or less.

  The atmospheric pressure dye-dyeable polyester fiber (B) is not particularly limited with respect to the cross-sectional shape of the fiber, and may be a perfect circular circular cross section. Different cross-section yarns such as a letter shape, an S shape, an X shape, an H shape, a C shape, a paddle shape, a cross beam shape, and a hollow shape may be used.

  Next, the mixed yarn of the present invention will be described.

  The ratio of the cellulose ester fiber (A) and the normal pressure dyeable polyester fiber (B) in the blended yarn can be arbitrarily determined. For example, if the ratio between the cellulose ester fiber (A) and the atmospheric dye-dyeable polyester fiber (B) is 2:98 to 20:80, a swelled feeling is slightly inferior, but a highly flexible mixed yarn is used. can get. On the contrary, if it is 80: 20-98: 2, the mixed fiber yarn which was excellent in the feeling of swell although the softness | flexibility is low will be obtained. In the range of 20:80 to 80:20, a mixed fiber having a good balance between flexibility and bulge is obtained.

  The physical properties of the blended yarn of the present invention are not particularly limited, but the strength is 2.0 to 5.0 cN / dtex and the elongation is 8 to 40 from the viewpoint of process passability in higher processing. % Is preferred. If the elongation of the blended yarn is 8% or more, the occurrence of fluff and yarn breakage is reduced in higher processing steps such as weaving and knitting. The elongation of the mixed yarn is more preferably 9% or more, and further preferably 10% or more. On the other hand, if the elongation is 40% or less, the change in the size of the fabric is small. The elongation of the blended yarn is more preferably 35% or less, and further preferably 30% or less.

  The total fineness of the mixed yarn of the present invention is preferably 50 to 400 dtex. When the total fineness is 50 dtex or more, a feeling of bulge is developed. The total fineness is preferably 70 dtex or more, more preferably 100 dtex or more. On the other hand, if the total fineness is 400 dtex or less, flexibility is not impaired, which is preferable. The total fineness is preferably 350 dtex or less, more preferably 300 dtex or less.

  The mixed fiber of the present invention can be processed such as drawing and false twisting in the same manner as general fibers. In addition, weaving and knitting can be handled in the same way as ordinary fibers.

The method for dyeing the mixed yarn of the present invention is not particularly limited, and techniques such as cheese dyeing, liquid dyeing and drum dyeing can be employed. As the dye, a disperse dye for acetate and polyester can be suitably used. The dyeing temperature is preferably 80 to 100 ° C., and a fiber or fabric excellent in color development and swelling can be obtained.
As a method for producing the blended yarn of the present invention, any of the conventionally known post-mixing method and spinning blending method can be applied. As the post-mixing method, both fibers are supplied and mixed in the twisting process, both fibers are supplied and mixed in the drawing process, and both fibers are supplied and mixed in the false twisting process. A method of fiber mixing, a method of fiber mixing by air entanglement, a method of fiber mixing by Taslan processing, a method of fiber mixing by twisting or combining yarns, or by aligning, and a method of mixing by spinning by supplying two types of staples in the spinning process. Examples thereof include, but are not limited to, a method for fiber mixing, a method for fiber mixing by knit, a method for fiber mixing by knit. In addition, the spinning blending method includes a method in which a yarn is discharged from two or more types of bases having different hole shapes and numbers of holes and combined and wound at the time of winding, or a single base in which a plurality of discharge holes are perforated. A method of discharging and winding a plurality of yarns at the same time is exemplified, but the method is not limited thereto.

  The blended yarn of the present invention can be used not only by blended yarn alone but also by mixing with fibers such as wool, silk, cotton, rayon, cupra, nylon and acrylic.

  Further, in the case of producing a fabric such as a woven or knitted fabric or a nonwoven fabric using the mixed yarn of the present invention, the knitting / knitting machine, the woven / knitted structure, the nonwoven fabric form and the like are not particularly limited, and a known method is used. be able to.

  The cellulose ester mixed yarn of the present invention can be used as a fiber structure such as a woven fabric, a knitted fabric and a non-woven fabric, and is particularly suitable for women's and men's garment applications because of its excellent texture, swellness and color development. be able to.

Hereinafter, the present invention will be described in more detail with reference to examples. Each characteristic value in the examples is obtained by the following method.
A. Measurement of weight average molecular weight (Mw) by GPC It was completely dissolved in tetrahydrofuran so that the concentration of the cellulose fatty acid ester was 0.15% by weight, and used as a sample for GPC measurement. Using this sample, GPC measurement was performed with Waters 2690 under the following conditions, and the weight average molecular weight (Mw) was determined in terms of polystyrene. The number of measurements was 3, and the average value was Mw.

Column: Two TSK gel GMHHR-H manufactured by Tosoh are connected. Output: Waters 2410 Differential refractometer RI
Moving bed solvent: Tetrahydrofuran Flow rate: 1.0 ml / min Injection volume: 200 μl
B. In an environment with high elongation, Young's modulus temperature of 20 ° C, and humidity of 65%, using a Shimadzu autograph AG-50NISMS model, a tensile test was conducted under the conditions of a sample length of 20 cm and a tensile speed of 20 cm / min. The value obtained by dividing the stress (cN) at the point indicated by the value by the fineness (dtex) was defined as the fiber strength (cN / dtex), and the elongation at break was defined as the fiber elongation (%). The initial tensile resistance was defined as the fiber Young's modulus (cN / dtex). In addition, the measurement was performed 5 times per sample, and the average value was defined as the strength, elongation, and Young's modulus of the fiber.
C. Boiling water shrinkage rate The sample was scraped and measured for sample length L0 under a load of 0.09 cN / dtex, and then treated in boiling water for 15 minutes under no load. After the treatment, the sample was air-dried, the sample length L1 was measured under a load of 0.09 cN / dtex, and calculated using the following formula. The number of measurements was 5, and the average value was defined as the boiling water shrinkage.

Boiling water shrinkage (%) = {(L0−L1) / L0} × 100
D. Measurement method of exhaustion rate Knitting a round tube from polyester filament fibers, then using SUMMORLBK-80 as a scouring agent, boiling at 80 ° C. for 20 minutes in a conventional manner, air-dried, and then freed After setting at 160 ° C. for 2 minutes at 160 ° C., staining is performed under the following conditions.

Dye: Sumikaron Red SE-RPD
Staining density: 3% owf
Dye pH: 6
Dye bath ratio: 1/100
Dyeing temperature: 100 ° C
Dyeing time: 60 minutes The dye solution before dyeing and the dyeing residue solution after dyeing were diluted with acetone at the same magnification as a measurement solution, and the main dye of each dye was measured using a spectrophotometer U3010 manufactured by Hitachi, Ltd. Absorbance was measured at the wavelength, and the dye exhaustion rate was calculated by the following equation. The larger the value of the dye exhaustion rate, the better the dye is dyed on the fiber.

Dye exhaustion rate (%) = {(absorbance of dyeing solution before dyeing−absorbance of dyeing residual solution after dyeing)
/ Absorbance of dyeing solution before dyeing} × 100
E. Dyeing characteristics A circular knitted fabric was prepared using the obtained mixed yarn, and after carrying out warm water scouring at 70 ° C. for 20 minutes, a set with dry heat at 160 ° C. for 2 minutes was performed. After that, dyeing was performed using 2% owf of Miketon FastBlueZ, which is a disperse dye, under conditions of a bath ratio of 20, a dyeing temperature of 100 ° C., and a dyeing time of 60 minutes. Regarding the levelness and sharpness of the obtained circular knitted fabric, the dyeing characteristics were evaluated by 10 visual examinations through visual sensory tests. The level dyeability was defined as a state where the entire fabric was dyed evenly and no irritation was observed. According to the sensory test, “no irritation” was evaluated as “◯”, “slight irritation” was evaluated as “△”, “with irritation” was evaluated as “x”, and “no irritation” was evaluated as “good”. On the other hand, vividness was defined as a state where a vivid and deep color was obtained with a dye. In the present invention, a blended yarn obtained by blending cellulose ester fibers is used as a reference showing extremely excellent sharpness. According to the sensory test, “excellent” was evaluated as ◎, “excellent” as ◯, “ordinary” as △, “inferior” as ×, and “excellent” as ○ or better.
F. Texture characteristics Regarding the flexibility and feeling of swelling of the circular knitted fabric after dyeing, the texture characteristics were evaluated by combining ten sensory tests with ten subjects. Evaluate flexibility and swell, `` Excellent '' is ◎, `` Excellent '' is ○, `` Normal '' is △, `` Inferior '' is ×, `` Excellent '' is more than ○ Passed.

Synthesis example 1
To 100 parts by weight of cellulose (dissolved pulp manufactured by Nippon Paper Industries Co., Ltd.), 240 parts by weight of acetic acid and 67 parts by weight of propionic acid were added and mixed at 50 ° C. for 30 minutes. After the mixture was cooled to room temperature, 172 parts by weight of acetic anhydride cooled in an ice bath and 168 parts by weight of propionic anhydride were added as an esterifying agent, and 4 parts by weight of sulfuric acid was added as an esterification catalyst, followed by stirring for 150 minutes. An esterification reaction was performed. In the esterification reaction, when it exceeded 40 ° C., it was cooled in a water bath. After the reaction, a mixed solution of 100 parts by weight of acetic acid and 33 parts by weight of water was added as a reaction terminator over 20 minutes to hydrolyze excess anhydride. Thereafter, 333 parts by weight of acetic acid and 100 parts by weight of water were added, and the mixture was heated and stirred at 80 ° C. for 1 hour. After completion of the reaction, an aqueous solution containing 6 parts by weight of sodium carbonate was added, and the precipitated cellulose acetate propionate was filtered off, subsequently washed with water, and dried at 60 ° C. for 4 hours. The cellulose acetate propionate thus obtained had an acetyl substitution degree of 2.0, a propionyl substitution degree of 0.7 (total cellulose ester substitution degree of 2.7), and a weight average molecular weight (Mw) of 178,000. It was.

Example 1
82% by weight of cellulose acetate propionate prepared in Synthesis Example 1, 17.9% by weight of polyethylene glycol (PEG 600) having an average molecular weight of 600, and bis (2,6-di-t-butyl-) as a phosphite colorant 4-methylphenyl) pentaerythritol diphosphite 0.1% by weight was kneaded at 230 ° C. using a biaxial extruder and cut to about 5 mm to obtain cellulose ester composition pellets (Mw 16,000).

  The pellets were vacuum dried at 80 ° C. for 8 hours, and spun from a die having 12 holes of 0.23 mmφ−0.30 mmL at a spinning temperature of 260 ° C. under a discharge rate of 10 g / min. After cooling this spun yarn with cooling air at a temperature of 25 ° C. and a wind speed of 0.25 m / sec, applying an oil agent and converging, and then picking it up with a first godet roller rotating at 1000 m / min It wound up with the winder and obtained the cellulose-ester fiber (A). The properties of the obtained fiber are shown in Table 1.

  Also, polyethylene terephthalate copolymerized with 7.5% by weight of PEG1000 was vacuum dried at 140 ° C. for 8 hours, and a die hole of 0.23 mmφ−0.30 mmL at a spinning temperature of 285 ° C. and a discharge rate of 11 g / min. Was spun from a die having 12 holes. After cooling this spun yarn with cooling air at a temperature of 25 ° C. and a wind speed of 0.25 m / sec, applying an oil agent and converging, and then picking it up with a first godet roller rotating at 1000 m / min A polyester fiber was obtained by winding with a winder. This polyester fiber was drawn using a drawing machine comprising a first goded roller heated to 80 ° C., a second goded roller heated to 90 ° C. (set temperature), and a third goded roller at room temperature and a winder. Went. Stretching was performed between the first goded roller and the second goded roller to obtain 33T-12F atmospheric pressure dye-dyeable polyester fiber (B).

  The cellulose ester fiber (A) and atmospheric pressure dyeable polyester fiber (B) are mixed at a mixing ratio of 100: 33 by air entanglement to form a uniform mixed yarn, and then knitted using a circular knitting machine. On the ground. This knitted fabric was scoured, set and dyed by the method described above. The dyeing characteristics and texture characteristics of the obtained knitted fabric are as shown in Table 1, and had extremely excellent dyeability and texture.

Examples 2-12
Cellulose ester fibers (A) and atmospheric dye-dyeable polyester fibers (B) were obtained in the same manner as in Example 1 under the polymers and yarn making / drawing conditions shown in Tables 1 and 2. A blended yarn was obtained in the same manner as in Example 1. The results are shown in Tables 1 and 2.

Comparative Example 1
Cellulose ester composition and maleimide copolymer (electrochemical industry “DENKAIP MS-NA” styrene / maleic anhydride / N-phenylmaleimide = 50.1 / 1.8 / 48.1, MFR (260 ° C.) = 2 0.5, Tg 196 ° C.) A mixed yarn was obtained in the same manner as in Example 1 except that 5.0% by weight was added. Table 3 shows the characteristics of the obtained fiber.

  The dyeing characteristics and texture characteristics of the obtained knitted fabric are as shown in Table 3, and the feeling of swelling was inferior.

Comparative Examples 2-6
Cellulose ester fibers (A) and polyester fibers (B) were obtained in the same manner as in Example 1 under the polymer and yarn making / drawing conditions shown in Table 3. Subsequently, a mixed yarn was obtained in the same manner as in Example 1. The results are shown in Table 3.

  The mixed yarn composed of the cellulose ester fiber (A) of the present invention and the atmospheric dye-dyeable polyester fiber (B) has excellent texture, swell, and color development. Therefore, a fiber structure such as a fabric using the mixed yarn has a good swell feeling and color developability and can be suitably used particularly for clothing.

Claims (5)

It contains at least a cellulose ester fiber (A) having a boiling water shrinkage of 0.2 to 5% and an atmospheric dye-dyeable polyester fiber (B) having a boiling water shrinkage of 10 to 35%, and the following formula A blended yarn characterized by satisfying (I).
(I) 5% ≦ boiling water shrinkage of atmospheric dye-dyeable polyester fiber (B) −boiling water shrinkage of cellulose ester fiber (A) ≦ 30%   2. The blend according to claim 1, wherein the constituent polymer of the atmospheric dye-dyeable polyester fiber (B) is at least one selected from the group consisting of polyethylene terephthalate, polytrimethylene terephthalate, and polybutylene terephthalate. Yarn.   The atmospheric dye-dyeable polyester fiber (B) is a normal-pressure disperse dyeable dye mainly composed of a polyester copolymerized with 5 to 10% by weight of polyethylene glycol having an average molecular weight of 500 to 4000. The mixed yarn according to claim 1 or 2.   The atmospheric pressure dye-dyeable polyester fiber (B) is an atmospheric pressure dye dyeable type mainly composed of polyester copolymerized with 5-sodium sulfoisophthalic acid and / or adipic acid. The mixed yarn according to claim 1 or 2.   The mixed yarn according to any one of claims 1 to 4, wherein at least a part of an acyl group of the cellulose ester which is a main component of the cellulose ester fiber (A) has 3 to 18 carbon atoms.