JPH06200411A - Polyester multifilament - Google Patents

Abstract

PURPOSE:To obtain the subject multifilament not causing streak, skitteriness and barry dyeings in woven or knitted fabric by specifying average hollow ratio, degree of variability of hollow ratio, degree of variability of denier, etc., of polyester hollow filament containing a fine pore forming agent. CONSTITUTION:The average hollow ratio HR (%), degree of variability of hollow ratio CV (%), degree of variability of denier UR (R) and the number P5 of increases (increases/m) in filaments having denier of monotone increasing by >=5% in polyester filaments having hollow sectional shape, containing 0.5-5wt.% fine pore forming agent are set 30>=HR>=3, 50>=CV>=5, 80>=UR>=5 and 1,000>=P5>=5, respectively to eliminate apparent monotony.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to elasticity, elasticity, elasticity,
The present invention relates to a polyester multifilament suitable for a high-quality knit fabric having a bulge and a natural unevenness and having a high fashionability.

[0002]

2. Description of the Related Art Up to now, polyester fibers have been used for various purposes including clothing and industrial materials by taking advantage of their excellent properties. Hollow cross-sectioned multifilament yarns are also well known for use in clothing, and a fabric with a hollow cross-section aimed at weight reduction and heat retention (Japanese Patent Laid-Open No. 85049/1987), and further to the hollow surface of the fiber surface. A yarn has been proposed in which a part of the yarn is made to communicate with each other to impart water absorption. However, hollow cross-section multifilaments have dyeing properties (including physical properties and appearance) depending on the hollow ratio.
Change, and unless a very uniform hollow ratio between filaments is supplied, defects such as streaks, unevenness, and dyeing stages increase. For this reason, it is necessary to strictly control the manufacturing process and carry out shipping inspection, but this is not industrially satisfactory.

The present inventors previously proposed a technique in which the above problems can be considerably reduced by varying the hollowness of the hollow filament within a specific range (Japanese Patent Laid-Open No. 17591/1990).
6). However, this improved technique can only obtain an apparently monotonous technique, and is not always satisfactory in streaks, irritability, and dyeing.

[0004]

DISCLOSURE OF THE INVENTION The present invention eliminates streaks, irritations and dyeing steps in a hollow cross-section multifilament knitted fabric according to the above conventional method, and has a mild luster, a dyeing feeling and a natural unevenness feeling, and a dry touch. The present invention provides a polyester multifilament for a high-quality knitted fabric, which has industrially good productivity and high fashionability.

[0005]

In order to solve the above-mentioned problems, the present invention takes the following means. That is,
The present invention comprises a polyester filament having a cross-sectional shape containing a fine pore-forming agent in an amount of 0.5 to 5% by weight and having a hollow portion in a cross section, and the average hollow rate HR (%) and the hollow rate variation rate of the polyester filament. CV (%), denier fluctuation rate UR (%), and the number P ₅ (ke / m) at which denier monotonically increases by 5% or more are represented by the following formulas (I), (II), (II), respectively.
A polyester multifilament characterized by satisfying I) and (IV). 30% ≧ HR ≧ 3% (I) 50% ≧ CV ≧ 5% (II) 80% ≧ UR ≧ 5% (III) 1000 / m ≧ P ₅ ≧ 5 / m (IV)

The present invention will be described in detail below. In the present invention, the polyester is a polyester having terephthalic acid or an ester-forming derivative thereof as a main dicarboxylic acid component, and glycol selected from ethylene glycol and 1,4-butanediol or an ester-forming derivative thereof as a main glycol component. Target.

For example, a part of the dicarboxylic acid component is 5
-A monoalkali metal salt of sulfoisophthalic acid, isophthalic acid, diphenyldicarboxylic acid, adipic acid, sebacic acid, P-oxybenzoic acid, etc. may be substituted,
Part of the glycol component is diethylene glycol,
It may be replaced with a dihydric alcohol such as 1,4-hydroxymethyldichlorohexane.

Further, a polyalkylene oxide compound such as polyethylene glycol may be copolymerized in an amount of 7% by weight or less with respect to the produced polyester to impart antistatic property, and particularly 1 to 10% by weight with respect to the polyester. It is also preferable to make the dyeing easy by copolymerizing the glycol represented by the following general formula in a ratio of. _{HO (C k H 2k O)} m R-O (C l H 2l O) n H ( in the above formula R 2 monovalent aliphatic hydrocarbon group having 4-20 carbon atoms, K, are the same or different 2 ~ Integer of 4, m, n
Are the same or different integers and 1 ≦ (m + n) ≦ 10). Further, a modified polyester may be prepared by blending a small amount of another polymer, and a color preventive agent, a catalyst and the like well known in the art may be appropriately used.

The hollow cross-sectional shape of the polyester filament of the present invention having a hollow cross-sectional shape may be either a single hollow part or a plurality of hollow parts.
In particular, a remarkable effect is recognized in a circular cross section and a triangular cross section with one hollow portion. In the constitution of the polyester multifilament of the present invention, a fine pore-forming agent is contained in an amount of 0.5 to 5% by weight, the hollow cross section has an average hollow rate of 3 to 30%, and the variation rate CV (%) of the hollow rate is 5 to 50%, the denier fluctuation rate UR (%) is 5 to 80%, and the combination requirement that the number P _{5 of} denier monotonically increasing by 5% or more is ₅ to 1000 pcs / m. It is particularly important to achieve the object of the present invention as follows. The micropore-forming agent preferably contains kaolinite, metakaolin, etc., which will be described later, so that reflected light and transmitted light are combined intricately, and a novel glossy and color tone effect with a mild depth can be obtained.

Particularly, polyethylene terephthalate has a refractive index of 1.537 in the fiber cross-section direction and a refractive index of 1.72 in the fiber axis direction.
When a kaolinite having a refractive index of 1.56 is added to the knitted fabric, the knitted woven fabric has a subtle deep gloss depending on the viewing direction. Next, if the amount of the fine pore-forming agent added is less than 0.5% by weight, deep dyeing performance cannot be obtained, and glare becomes strong as in the case of ordinary bright yarn. However, if it exceeds 5.0% by weight, it is not preferable because the spinnability in the spinning and drawing process is deteriorated and the strength of the filament yarn is decreased. By adding such a fine pore-forming agent, it is possible to obtain fine pores on the fiber surface by alkali reduction treatment in the state of the yarn or cloth after being made into fibers. Next, if the average hollow ratio is less than 5%, the effects of weight reduction, heat retention, and elasticity as a hollow fiber are not recognized. On the other hand, if the average hollow ratio exceeds 30%, the spinning / drawing tends to be non-uniform, and it becomes difficult to form a part or hollow and the strength (tensile strength) of the filament decreases, which is industrially satisfactory. Not a thing. The hollow ratio referred to here has a numerical value represented by hollow ratio (%) = (l ₂ / l ₁ ) ² × 100, where l _{1 is} the outer peripheral length of the cross section and l ₂ is the inner peripheral length of the filament cross section. It is called hollow rate. Next, the hollow ratio CV% is calculated by the following formula from the hollow ratio of all filaments constituting the multifilament. CV (%) = (average value of V ^1/2 / x) × 100 Here, V ^1/2 is the unbiased square root of the hollow ratio of all filaments constituting the multifilament, and x is the hollow ratio of the polyester filament. .

It has been found that by varying the hollow ratio of the filaments constituting the multifilament yarn, the difference in the tint between the individual filaments can be greatly reduced, although the difference in the tint between the individual filaments can be greatly reduced. The CV% of the hollow ratio needs to be in the range of 5 to 50%, more preferably 10 to 40%. If the hollow ratio CV% is less than 5%, there is little variation and the difference in dyeing density as a multifilament does not decrease. However, if the CV% of the hollow ratio exceeds 50%, the hollow ratio difference between the filament-constituting filaments is large (difference in dyeing density is large), which causes an irritability.

Next, the denier fluctuation rate UR (%) as a multifilament must be in the range of 5 to 80%. If it is less than 5%, the unevenness is hardly visible and the appearance is monotonous. On the contrary, if it exceeds 80%, the difference in shade is too conspicuous, and the appearance becomes unpleasant, and the darkness (thick thread portion) is concentrated and the physical properties (particularly strength) are improved. However, if the alkali weight reduction processing is further performed, the thick yarn portion is intensively reduced and so-called dusting occurs. Furthermore, the number that denier increases monotonically by 5% or more is 5
If it is more than 1000 / m, there is no thick and thin spot, and if it exceeds 1000 / m, unpleasant unevenness is conspicuous, so it is excluded from the invention. 10-500 pcs / m for natural unevenness
Is a more preferable range.

The multifilament yarn of the present invention preferably has a single yarn denier of 0.5 to 5 denier,
If it is less than denier, the bending elasticity of the hollow-section multifilament yarn is not satisfactory. Again 5
If the denier is exceeded, the woven and knitted fabric will have a rough and hard texture.
The hollow cross-section filaments of the present invention exhibit more uniform hollow ratio distribution close to the normal distribution, but a plurality of filament groups having an average hollow ratio difference of 3% or more may be mixed and woven. The hollow cross-section polyester-based multifilament yarn of the present invention can be used as a woven or knit fabric as it is, or after processing twisted yarn, false twist or the like, the effect is not changed as a woven or knit fabric, and a product without defects such as streaks, irritability and dyeing stage can be obtained. To be

The polyester-based multifilament yarn of the present invention comprises, for example, a hollow fiber forming spinning nozzle having a C-shaped slit, and a mixture of C-shaped slits having different outer diameters, and melt-spun by a conventional method. The discharged yarn is cooled and individualized and oiled to obtain an undrawn yarn. It is obtained by drawing the obtained undrawn yarn at a draw ratio of the natural drawn ratio of the undrawn yarn × about 1.1 or less. In addition, the C-shaped slit-shaped nozzles for forming hollow fibers have the same C-shaped slit shape and are arranged in three or more rows in the cooling air direction to reduce the penetration of the cooling air and control the variation of the hollow ratio between the rows, thereby performing melt spinning. Then, similarly, an undrawn yarn is obtained, and the yarn is obtained by drawing under the above-mentioned conditions.

[0015]

【Example】

Example 1 and Comparative Examples 1 to 3 Hereinafter, examples will be described in detail, but the present invention is not limited to these examples. Kaolinite [ASP-072 manufactured by Engelhard Co., Ltd .: 10% of coarse particles are removed by centrifugation, refractive index is 1.56, average particle size is 0.3 μm, 1 μm particles is 6 wt% (TiO ₂ is 1.5% in kaolin as an impurity. 2% by weight) was added. A polyester polymer having an intrinsic viscosity of 0.6 consisting essentially of repeating ethylene terephthalate alone was prepared by a conventional method at a spinning winding speed of 2600 m / min and a nozzle hollowness of 50.
Spinning was performed using a spinning nozzle in which 55-, 60-, 65-, and 70-% C-shaped holes were randomly arranged. Furthermore, originally drawn yarn is drawn at 1.75 times (natural drawing ratio 1.70 times) to have an average hollow rate of HR 10%, a hollow rate variation rate of CV 16%, and a denier variation rate of UR (measured by Wooster Ebne Stector manufactured by Zuelbeger). 15%, 5% or more monotonically increasing number P ₅ (measured by the same method as UR) 75 denier 3 at 85 / m
A drawn filament of 6 filaments was obtained.

As a comparative example, the following comparative example was carried out by using the same polymer as that of the example. Comparative Example 1 The content of the micropore-forming agent was 0.1%, and the remaining conditions were the same as in Example 1. Regarding the physical properties of the obtained filament, the average hollow rate HR was 9.5%, the hollow rate variation rate CV was 17%, the denier variation rate UR (%) was 14%, and the P ₅ was 80 pcs / m. Comparative Example 2 A uniform C-type nozzle was used (nozzle hollow ratio 60
%) And other conditions were the same as in the example. HR 10.0
%, CV 1.0%, UR 15%, P ₅ 90 units / m. Comparative Example 3 The stretching ratio was adjusted so that the breaking elongation was 35%, and the polymer discharge amount during spinning was changed to 75 denier after stretching. The other conditions were the same as in the example, and the physical properties of the obtained filament were as follows: HR 11.5%, CV 13%, UR
4.5, it was P ₅ 1. The obtained yarn is S, Z250
Twisted at 0T / m and then set, warp density 85 yarns / i
n Weft density 78 warps / in, both wefts are S twist, Z twist 2
Evaluation was carried out after arranging the pieces alternately, making a plain weave, and giving a graining treatment. The woven fabrics of the examples have elasticity, elasticity, elasticity, and a natural uneven feeling without habit. The sample of Comparative Example 1 did not have a deep bathochromic feeling and had a strong luster. The sample of Comparative Example 2 had a conspicuous streak probably because of its small CV%, and Comparative Example 3 was monotonous with no natural unevenness and swelling in swelling.

[0017]

EFFECTS OF THE INVENTION According to the present invention, a high-quality woven or knit fabric having high elasticity, which has rich elasticity, swelling and elasticity, and elasticity which have not been obtained by conventional methods, and which has a natural unevenness is stable. Can be obtained.

Claims (1)

[Claims] 1. A micropore-forming agent is included in an amount of 0.5 to 5% by weight,
In addition, the polyester filament has a cross-sectional shape having a hollow portion in the cross section, and the average hollow rate HR (%), hollow rate variation rate CV (%), denier variation rate UR (%), and denier of 5% or more of the polyester filament. The number P ₅ (ke / m) that monotonically increases is calculated by the following equations (I), (II),
A polyester multifilament satisfying (III) and (IV). 30% ≧ HR ≧ 3% (I) 50% ≧ CV ≧ 5% (II) 80% ≧ UR ≧ 5% (III) 1000 / m ≧ P ₅ ≧ 5 / m (IV)