JPH0359130A - Polyester blended yarn having different shrinkage - Google Patents

Abstract

PURPOSE:To obtain the title blended yarn consisting of two or more kind of fiber groups different in heat shrinkage, containing a specific amount of delustering agent in all fiber group having the smallest shrinkage among the above-mentioned fiber groups, prevented in transparency and capable of providing milky gloss and handle of dry touch, etc. CONSTITUTION:The aimed blended yarn, preferably consisting of two kind of fiber groups, being a polyester having a modified cross section such as triangle cross section and containing 1.3-10.0wt.% delustering agent (preferably titanium oxide having <=1mum average particle size) in low-shrinkage yarn among the two kind of fiber groups and being a copolymer polyester copolymerized with 5-18mol% third component (e.g. citric acid or phthalic acid) in high- shrinkage yarn which is other fiber group and obtained by subjecting the two kind of fiber groups to interlacing treatment so as to afford interlace pin count, preferably of 5-60/m and having <=32% boiling water shrinkage and 5-28wt.% DFL.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention prevents see-through, has a milky luster, fullness, drapability, and a soft feel, and especially has a delicate dry touch that could not be created with conventional technology. The present invention relates to a polyester shrinkage blend yarn suitable as a yarn constituting a thin woven or knitted fabric having a texture.

[Prior Art] Currently, polyester fibers are widely used in clothing applications due to the easy care properties of N fibers. This clothing 1
Particularly in the field of thin clothing, it is essential to control light transmittance, that is, to prevent so-called see-through. For this purpose, polyester fibers containing matting agents such as titanium oxide as light shielding agents have been widely used successfully for thin clothing. In addition, particles such as titanium oxide not only move with the light shielding agent in the fibers, but also eliminate the sliminess characteristic of synthetic fibers from the final woven or knitted fabric.
It has the effect of imparting a saran dry touch texture and a milky luster. This is because the matting agent in the fibers diffusely reflects light, and the matting agent near the surface of the fibers falls off due to the alkali weight loss treatment that is normally performed when manufacturing woven and knitted fabrics, creating fine irregularities on the surface of the fibers. It is believed that this is for the purpose of

However, with the rise in consumer awareness regarding clothing, woven and knitted fabrics that only satisfy these characteristics are becoming obsolete, and the drawbacks of not being able to respond to diversification and luxury have been highlighted. In particular, these woven and knitted fabrics could not be given any texture such as fullness or drapability.

On the other hand, woven and knitted fabrics using polyester differential shrinkage mixed fiber yarns are considered important because they can provide fullness, drapability, and a soft feel at the same time, and related technologies include Japanese Patent Publication No. 55-22586; Tokuko Showa 5
B-3064 publication or JP-A-58-120816
It is disclosed in the publication number etc. These polyester differential shrinkage blend yarns are intended for silky woven and knitted fabrics, and because a silk-like luster is essential, they do not contain matting agents such as titanium oxide at all, or even if they do contain them, they contain only a small amount. Typically, a polyester containing a certain amount was used. For this reason, it was naturally inferior in terms of preventing see-through.

As a method for solving this problem, a technique is disclosed in JP-A No. 61-275434@, in which a matting agent is contained only in a group of fibers having a large shrinkage rate in a shrinkable cross weave yarn. According to this technology, MP! By not containing an erasing agent but containing a metal-containing phosphorus compound and an alkaline earth metal compound, fine pores are created, and by adding a matting agent to the fiber group with a high shrinkage rate, deep color and vividness can be achieved. It is possible to create fibers that have excellent elasticity and provide a #1 knitted fabric that is soft, full, and non-see-through. However, in the #1 knitted fabric made of such fibers, since no matting agent is contained in the aim group with a low shrinkage rate that floats on the surface of the woven or knitted fabric, there is no milky luster and the overall texture is satisfactory. It's not something you can do.

[Problems to be Solved by the Invention] The present invention solves the problems of the prior art, prevents see-through, and provides milky luster, fullness, drapability, and a soft feel that could not be created using the prior art. The object of the present invention is to obtain a polyester shrinkage differential fiber yarn that is suitable as a yarn constituting a thin woven or knitted fabric having a dry touch feel of 18%.

[Means for Solving the Problems] The object of the present invention as described above by the present inventors is to provide a gAN group consisting of at least two types of gAN having different heat shrinkage rates, and a boiling water shrinkage rate of 3.
A shrinkage mixed fiber yarn having a boiling point DFL of 5% or more and 28% or less at a temperature of 2% or less, and at least the fibers rff1 group (hereinafter referred to as It has been found that this can be achieved by using a polyester differential shrinkage mixed yarn characterized in that all of the low shrinkage yarns (referred to as low shrinkage yarns) contain a matting agent in an amount of 1.3% by weight or more and 10.0% by weight or less.

In the present invention, in order to obtain a thin woven or knitted fabric that has the targeted milky luster and a delicate dry touch texture that is not found in the conventional technology, and is also prevented from being see-through, it is necessary to
It is necessary to contain a matting agent in all of the low shrinkage yarns that make up the T yarn. However, the content of the matting agent must be 1.3% to 10.0% by weight. If the matting agent content is less than 1.3% by weight, none of the characteristics of milky gloss, silky dry touch texture, and prevention of see-through (hereinafter referred to as "resistance") cannot be satisfied. It is preferable that the content of the matting agent is 2.0% by weight or more, since the milky gloss becomes milder. On the other hand, if the content of the matting agent exceeds 10% by weight, the yarn strength will be low and fuzz will easily occur during weaving or knitting.

Also, from the viewpoint of operability in the spinning process, if the content of the matting agent exceeds the maximum 101%, clogging of the filter medium during spinning becomes significant, making stable spinning for a long period of time difficult. Note that it is more preferable that the content of the matting agent is 7% by weight or less, since there is almost no decrease in the strength of the yarn.

The anti-transparent property targeted by the present invention can be achieved by including a specific amount of a matting agent in some of the single yarn groups of the shrinkage mixed fiber yarns constituting the woven or knitted fabric.

Here, it is preferable that all the fibers of the differential shrinkage mixed yarn contain a matting agent in an amount of 1.3% by weight or more and 10.0% by weight or less, since the anti-transparent property is further improved.

However, as in the case of low shrinkage yarn, the matting agent content is 1.3
If the content of the matting agent is less than 10% by weight, the yarn strength will be low and fuzz will easily occur during weaving, and the matting agent will not be as effective in terms of workability. If the content of the erasing agent exceeds 10% by weight, clogging of the filter medium during spinning becomes significant, making stable spinning for a long time difficult. Therefore, the content of the matting agent is preferably 10% by weight or less. Further, it is particularly preferable that the content of the matting agent is 7% by weight or less, since there is almost no decrease in the strength of the yarn.

In order to impart the soft feel targeted in the present invention, the Sumoto shrinkage rate (hereinafter referred to as BWS) of the differential shrinkage blend yarn must be 32% or less. If the BWS exceeds 32%, The obtained woven or knitted fabric has too strong a rough and hard feel and has no commercial value.In order to achieve a higher level of soft feel, the BWS is preferably 28% or less.

In the present invention, in order to provide the targeted rich fullness and delicate dry touch texture, the boiling point DFL (hereinafter referred to as DFL) of the differential shrinkage blend yarn must be 5% or more.
It needs to be 8% or less. In particular, in order to impart a vanishing dry-touch texture to a woven or knitted fabric, simply adding a specific amount of a matting agent to all of the low-shrinkage yarns that make up the differential shrinkage blend yarn does not satisfy the necessary conditions. Furthermore, the DEL must be 5% or more and 28% or less. D.F.L.
If it is less than 5%, the resulting woven or knitted fabric will be paper-like without sufficient bulge, and the dry touch texture will be the same as that of ordinary yarn. Texture cannot be imparted.

Here, when the DFL is 9% or more, the swelling becomes richer, which is preferable. On the other hand, if the DFL exceeds 28%, the low shrinkage yarn will buckle on the surface of the woven or knitted material, making it difficult to maintain a uniform surface appearance, resulting in not only fullness but also W! The overall feel of the knitted fabric deteriorates significantly, making it impossible to obtain a woven or knitted fabric with the high level of feel that is the objective of the present invention.

Here, if DEL is 23% or less, taIIl
The dry touch texture is more advanced, which is preferable. The method for measuring WS and DFL will be described later.

The feature of the present invention is that the low shrinkage yarn of the differential shrinkage mixed fiber yarn contains a matting agent. The low shrinkage yarns in the differential shrinkage blend yarn are in a floating state on the surface of the woven or knitted fabric, and this can be said to be in a unique state compared to normal yarns in the woven or knitted fabric. The delicate dry-touch texture that is the goal of the present invention can be created by using a matting agent to bring the fibers, which have minute irregularities, into such a specific state on the surface of the woven or knitted fabric. . The cause of this is not clear, but due to the shedding of the matting agent due to alkali weight loss treatment, there are fine irregularities, which results in a small contact area per unit fineness when touched, and the surface adhesion energy of the matting agent. Because of the small
This is thought to occur because IIAM, whose surface frictional properties of the single yarn have changed significantly, floats on the surface of the woven or knitted fabric and is relatively mobile.

The differential shrinkage mixed fiber yarn of the present invention needs to be made of polyester with excellent W4 fiber formation properties, and polyethylene terephthalate is preferable. This polyester or polyethylene terephthalate may contain diethylene glycol or the like in its main chain as long as it is by-produced during the manufacturing process. In particular, it is possible to use the spinning blend method, which is the most excellent in terms of productivity among the methods for producing differential shrinkage blend yarns, so polyester is used as the low shrinkage yarn, and the R fiber group (with the highest shrinkage rate) ( It is preferable that the copolymerized polyester (hereinafter referred to as high shrinkage yarn) is copolymerized with a third component.

Stable yarn spinning is possible here, and the shrinkage characteristics of the shrinkage mixed fiber yarn described above can be easily obtained.
The amount of copolymerization is more preferably 5 mol% or more and 18 mol% or less.

Furthermore, by using a specific copolymerized polyester as the copolymerized polyester used in this high-shrinkage system, the alkali weight loss rate ratio per unit surface area of the high-shrinkage yarn is higher than that of the low-shrinkage yarn. It is preferable to increase it by 3 or more and 3.1 or less. Differential shrinkage blend yarns with such a difference in alkali weight loss rate between high shrinkage yarns and low shrinkage yarns are
The alkaline weight loss treatment that is usually carried out in the finishing process of woven or knitted fabrics makes it easy to achieve the best possible delicate dry touch texture and drape properties at the same time.

The method for measuring the alkali weight loss rate ratio per unit surface area, which is a measure of the difference in alkali weight loss rate between high shrinkage yarns and low shrinkage yarns, will be described later.

Usually, the third component of copolyester used for high shrinkage yarn of differential shrinkage blend yarn is oxalic acid, sebacic acid,
In addition to dicarboxylic acids such as phthalic acid and isophthalic acid, glycols such as diethylene glycol, polyethylene glycol, and neopentyl glycol, bisphenol A, bisphenol sulfone, etc., and two of these.
Examples include those in which more than one type of third component is copolymerized at the same time. Specific copolymerized polyesters in the present invention include those whose alkali weight loss rate is greater than the alkali weight loss rate of the polyester by 1.3 or more and 3.1 or less in terms of alkali weight loss rate ratio per unit surface area. can be suitably selected. Especially bisphenol A
A differential shrinkage blend yarn in which a copolymerized polyester containing 1.0 mol% or more and 3.0 mol% or more of isophthalic fi and a third component is copolymerized as a high shrinkage yarn is easy to spin and is a final product. #1 is preferable because the knitted fabric has a higher degree of fullness.

In general, a differential shrinkage blend yarn using a copolymerized polyester copolymerized with 1.0 mol% or more of bisphenol A and 4.8 mol% or less of bisphenol A and 3.0 mol% or more of isophthalic m as a third component is used as a high shrinkage yarn. This is preferable because the fading fastness of the final product, woven or knitted product, is good. Note that the difference in intrinsic viscosity between the copolymerized polyester and polyester constituting the high-shrinkage yarn and the low-shrinkage yarn is preferably 0.03 or less, and it is more preferable that the high-shrinkage yarn has a higher intrinsic viscosity. When this difference exceeds 0.03, walnuts occur in the differentially shrinkage blended yarn, which tends to deteriorate spinning, weaving, and knitting properties. Intrinsic viscosity here is one unit measured in orthochlorophenol at 25°C.

The matting agents used in the present invention include titanium oxide, zirconium oxide, magnesium oxide, aluminum oxide, silicon oxide, antimony oxide, zinc oxide, lead tungstate, calcium tungstate, calcium carbonate, etc., which exhibit the effects of the present invention. However, any material may be used as long as it can be stably dispersed in polyester, but from the viewpoint of dispersibility, titanium oxide, silicon oxide, zinc oxide, and calcium carbonate are preferable.

From the viewpoint of dispersibility, the average particle size of the matting agent to be added is 1.
The thickness is preferably .mu.m or less, more preferably 0.7 .mu.Ill or less. Furthermore, from the viewpoint of spinning properties, the maximum particle size is 5 μff.
i or less is preferable, and more preferably 3 μm or less.

The differential shrinkage mixed fiber yarn of the present invention needs to be composed of at least two types of m-male portions having different heat shrinkage rates, but since it is easy to spin, there are two types of l-male portions. Preferably, it is a group of fibers. Further, it is preferable that the number of single yarns of the low shrinkage yarns in the differential shrinkage yarn is equal to or greater than the number of single yarns of the high shrinkage yarns, as this will further improve the fluffiness and the ampery dry touch feel. There are no particular limitations on the cross-sectional shape of the single yarn for high-shrinkage yarns, but low-shrinkage yarns preferably have irregular cross-sections such as triangular cross-sections, T-wall cross-sections, and trilobal cross-sections in order to impart a milky luster.

The shrinkage mixed fiber yarn of the present invention can be used, for example, in Japanese Patent Publication No. 51-306
It can be obtained by conventional mixed fiber spinning and drawing as shown in Japanese Patent Application Laid-Open No. 49-72449. In this yarn spinning process, it is preferable to apply fluid entanglement treatment to improve process passability in weaving, knitting and weaving. However, since the intertwining points prevent the low shrinkage yarn from lifting up on the surface of the tjfifm object, excessive intertwining results in a deterioration of the texture.

The preferred degree of entanglement is in the range of 5 to 60 pieces/m.

If the degree of entanglement does not reach 5 co/m, the degree of improvement in process passability will not reach a practical level, which is not preferable. Note that the method for measuring the degree of entanglement follows the method disclosed in Japanese Patent Application Laid-Open No. 48-28708.

Here, a method for measuring the yarn properties of the differential shrinkage mixed fiber yarn in the present invention will be described.

■ Submerged shrinkage rate (BWS) The sample length (L
After measuring o>, a boiling water treatment is performed for 20 minutes under no load. After treatment, the sample length (Ll
>Measure. BWS is expressed by the formula ■.

BWS= (L o−11) /L o xloo(%
〉 ■ ■ Boiling yield DFL (DEL> After dividing the differential shrinkage mixed fiber yarn into high shrinkage yarn and low shrinkage yarn, the sample lengths (Lho, Lp
o) was measured, and treated with boiling water for 20 minutes under no load. After treatment, the sample length (Lh+
, Ll+). Calculate each water conduction shrinkage rate (BWSh, BWSl) according to method (2).

DFL is expressed by the formula (■).

DFL= (BWSh-BWSx)/(100-B
WSh)
Dry heat treatment at ℃ is performed for 3 minutes. After this treatment, a cross-sectional photograph of the sample is presented. Next, boil n! with 3.5% sodium hydroxide aqueous solution. Process at temperature to reduce weight by 15% to 30%. Furthermore, a cross-sectional photograph of the sample is taken, and the alkali weight loss rate ratio of the high-shrinkage yarn and the low-shrinkage yarn is calculated from the change in cross-sectional area. Furthermore, alkali reduction H is obtained from the single yarn fineness ratio and density ratio of high shrinkage yarn and low shrinkage yarn! 1. Calculate the surface area ratio of both.

From these two ratios, the alkali weight loss rate ratio per unit surface area is calculated.

[Example] The present invention will be explained below by giving specific examples.

Example 1 After carrying out an esterification reaction using a terephthalic acid/ethylene glycol slurry, an ethylene glycol solution of titanium oxide (13
, 5CI/100mQ) was added, and a normal polymerization reaction was carried out to obtain polyethylene terephthalate chips with different titanium oxide contents (Chip I > 8 types.On the other hand, terephthalic acid/ethylene glycol and isophthalic acid/ethylene glycol slurries were added. After carrying out the esterification reaction using bisphenol 8, the average particle size is 0.5 μm and the maximum particle size is 2.
μm of titanium oxide in ethylene glycol solution (13,
5g/100mQ) was added to 7JOt, and 10.5JOt of isophthalic acid with different titanium oxide contents was subjected to a normal polymerization reaction.
Two types of chips (Chip II) of copolymerized polyethylene terephthalate containing 3.5 mol% of bisphenol A were obtained. The chips ■ and chips ■ obtained in this way were combined into various combinations shown in levels NQ1 to Nα9 in Table 1, and were spun at a spinning temperature of 2 using a spinning machine equipped with spinnerets having different discharge hole diameters.
The mixed fiber undrawn yarn was spun at 90°C and a spinning speed of 1300 m for 7 minutes, and the mixed fiber undrawn yarn was further drawn at a drawing speed of 800 m.
Hot roll (temperature 90'C) - hot plate (temperature 10'C) in 7 minutes
Table 1 Water lN01
~75 denier 36 filament with shrinkage characteristics shown in level NQ9 (high shrinkage thread two triangular cross section, 37.5 denier 1
A differential shrinkage mixed fiber yarn with 8 filaments, low shrinkage yarn, two triangular cross sections, 37.5 denier (18 filaments) was obtained. In addition, during stretching, air entanglement was applied to give 20 entanglements/m,
The stretching ratio was adjusted so that the elongation of the drawn yarn was in the range of 30% to 40%. Further, the intrinsic viscosity of the high shrinkage yarn was 0.85, and the intrinsic viscosity of the low shrinkage yarn was 0.64.

Table 1 also shows the measurement results of the alkali weight loss rate ratio per unit surface area.

Using this yarn as the warp and weft, we weave at a weaving density of 105 yarns/inch and 85 yarns/inch, respectively, to make a plain weave. After relaxing scouring with hot water at 98°C, finishing and setting at 170°C, and further reducing the weight loss by 23 The woven fabric was subjected to an alkali weight loss treatment of ~25%.

This woven fabric gives you a full and soft feeling! A fine dry touch texture, milky luster, and drapability were evaluated by sensory evaluation.

The anti-transparent property is determined by measuring the difference in L value between a white body and a black body by placing a white body and a black body behind this woven fabric using an SM color computer manufactured by Suga Test Instruments Co., Ltd.
In terms of rank, impermeability was used as a measure of sex.

In Table 1, levels Nα1.2 and 9 are comparative examples for confirming the effects of the present invention.

In the comparative example of water 1lP=Nα1, the aim dry touch texture, milky gloss, and anti-transparency properties are not satisfactory. This is because the amount of titanium oxide in the low shrinkage yarn is too small.

Even at level Nα2, which is a comparative example, the fiber IB dry touch texture and milky gloss are not satisfactory.

This is also because the amount of titanium oxide in the low shrinkage yarn is too small.

Level Nα9, which is a comparative example, is good in terms of the items shown in Table 1, but the tearing strength of the woven fabric is low, and the quality is degraded due to a large number of fuzz generated during weaving, and it has no commercial value. It became. Furthermore, the filtration pressure increased significantly due to clogging of the filter layer during spinning, making stable spinning for 5 hours or more difficult.

Level 1'IQ3 to level Nα8 which are examples of the present invention are as follows:
A good texture is obtained. However, in the woven fabrics of level NQ7 and level Nα8, a slight decrease in tearing strength was observed, which is considered to be due to a decrease in the strength of the differentially shrinkage mixed fiber yarn.

(Left below) Example 2 Terephthalic acid/ethylene glycol and isophthalic acid/
After carrying out an esterification reaction using an ethylene glycol slurry, 8 liquids (13,5CI/100mQ> of ethylene glycol of titanium oxide with an average particle size of 0.5 μm and a maximum particle size of 2 μm) and bisphenol 8 were added. Four types of copolymerized polyethylene terephthalate chips containing 3.F and 41% titanium oxide after polymerization reaction (chip ■)
I got it. Using the combinations shown in Table 2 of these various chips (1) and Chip A (containing 3.5% by weight of titanium oxide) at the level Nα5 of Example 1, yarn was spun and woven according to the method of Example 1, and woven fabrics were used for the same evaluation. Ta.

However, for level No. 19, the alkali reduction rate was kept at 19%, and the other steps were evaluated in the same manner as in Example 1.

In Table 2, levels N (110, 16, and 17 are comparative examples for confirming the effects of the present invention).

In the comparative example, the level Nα10 is 1! Fine dry touch and swelling are not satisfactory. This is due to the lack of DFL.

Level No. 016, which is a comparative example, is not satisfactory in terms of delicate dry touch and swelling.

In addition, buckling of the low shrinkage yarns was observed on the surface of the fabric, and the texture was considerably deteriorated. This is because DFL is too large.

Water INα17, which is a comparative example, is not satisfactory in terms of delicate dry touch, fullness, and soft feel. Also, as with level Nα16, buckling of the low shrinkage yarns was observed on the surface of the fabric, and the feel was considerably deteriorated. This is DFL, B
This is because SW is too large.

Levels Nα11 to Nα15.18 and 19, which are examples of the present invention, all have good texture. Especially level N
α12 was a fabric with a good texture. Level Nα18
The fabric had almost good texture, but the slightly delicate dry touch was on the verge of deterioration.

In addition, the fading fastness of level Nos. 13 to 19 was slightly lower than that of the other levels.

[Effects of the Invention] The present invention specifies the shrinkage characteristics of differential shrinkage mixed fiber yarns, and
By incorporating a matting agent into the low-shrink yarn group, it prevents see-through and creates a milky luster, fullness, drapability,
A polyester differential shrinkage blend yarn that is rich in softness and has a unique firmness and stiffness, and is especially suitable as yarn for composing woven and knitted fabrics that have a moist and delicate dry touch texture that could not be created with conventional technology. It is. That is, in the prior art, particles of titanium oxide or the like were added. *Although it was possible to obtain a dry touch texture by subjecting the fibers to alkali reduction treatment, only a smooth touch was obtained; This is a new texture that cannot be expected from conventional technology.

Claims (3)

[Claims] (1) Consisting of at least two types of fiber groups with different heat shrinkage rates, boiling water shrinkage rate is 32% or less and boiling point DFL is 5% or more2
A shrinkage mixed fiber yarn having a shrinkage ratio of 8% or less, at least all of the fiber groups having the smallest shrinkage percentage among the fiber groups constituting the shrinkage mixed fiber yarn contain a matting agent of 1.3% by weight or more. A polyester shrinkage differential blend yarn characterized by containing .0% by weight or less. (2) The shrinkable polyester according to claim (1), wherein all the fiber groups constituting the differential shrinkage blend yarn contain a matting agent of 1.3% by weight or more and 10.0% by weight or less. Differential blend yarn. (3) The fiber group with the smallest shrinkage percentage constituting the differential shrinkage mixed fiber yarn is polyester, and the fiber group with the largest shrinkage percentage is a copolymerized polyester copolymerized with a third component of 5 mol% or more and 18 mol% or less. The polyester differential shrinkage mixed fiber yarn according to claim (1) or (2), characterized in that: