JPS62223322A - Modified cross-section combined filament yarn having difference shrinkage - Google Patents

Abstract

PURPOSE:To provide the titled combined filament yarn having flat cross-section, composed of plural kinds of polyester multi-filaments having different hot-water shrinkage, containing a polyarylate derived from a bisphenol compound and terephthalic acid, etc., and having excellent feeling and luster. CONSTITUTION:The objective combined filament yarn composed of two or more polyester multifilament groups having flat cross-section and different hot-water shrinkage can be produced by (1) mixing or reacting (A) a polyarylate produced from a bisphenol compound (e.g. bisphenol A) and a terephthalic acid component and/or isophthalic acid component with (B) a fiber-forming thermoplastic polyester (e.g. polyethylene terephthalate), (2) producing an undrawn yarn by the melt composite spinning of a composition containing the above mixture or reaction product as at lest a component, (3) drawing and heat-treating a part of the undrawn yarn and drawing the remaining part of the yarn and (4) doubling both yarns and winding into the same pirn.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a irregularly shaped and irregularly shrunk mixed fiber yarn that provides a textile product having a unique texture and luster.

(Prior Art) Various studies have been made to impart natural fiber-like properties or properties not found in natural fibers to synthetic fibers such as polyester fibers and polyamide fibers, and many successes have been achieved. Among these, the technology of differentially shrinkable mixed fiber yarns is attracting attention, and it is widely used in the production of silk-like polyester fiber products. The production of this differentially shrinkable mixed fiber yarn is mainly done by dividing the polyester undrawn yarn multifilament after melt spinning into two or more groups, and drawing and heat treating them under different conditions. (There will be a difference in heat shrinkage rate between the two) This is done by doubling one yarn and winding it up into the same puff cage.

What is obtained at this time is a multifilament having a hot water shrinkage rate difference of usually about 5 to 20%, and is supplied as fiber for obtaining a silk-like fabric.

On the other hand, the texture of the 2 synthetic fiber products was further changed.

There is a strong demand for products that cannot be obtained with natural fibers (and the manufacturing technology of filaments with a high degree of differential shrinkage is attracting attention). However, in order to obtain a high shrinkage difference, other fiber properties such as strength and elongation had to be sacrificed, and it was difficult to obtain a high shrinkage difference yarn that could be put to practical use.

The present inventors conducted various studies to obtain a polyester blend yarn with a large degree of differential shrinkage without impairing yarn properties such as strength and elongation, and found that a mixture of polyarylate (A) and polyester (B) We discovered that fibers containing a small amount of (reactant) have a hot water shrinkage rate that changes greatly depending on the presence or absence of heat treatment or heat treatment conditions, and that the fiber properties of the resulting fibers do not pose any practical problems. A differentially shrinkable mixed fiber yarn in which at least a portion of the filaments are fibers containing such components has already been proposed in Japanese Patent Application No. 60-240310.

(Problems to be Solved by the Invention) The differentially shrinkable mixed fiber yarn proposed above exhibits unique heat shrinkage behavior, and is a yarn that can impart unprecedented tension, waist, fullness, and squeaky feeling to the fabric obtained from it. However, as the market becomes more fashionable, there is a demand for threads that can provide even more visual effects.

The present invention is intended to meet the above-mentioned market demands, and it goes without saying that it is possible to increase the degree of differential shrinkage without impairing yarn properties such as strength and elongation, or yarn spinnability.
A technical object of the present invention is to provide a polyester-based irregular shrinkage mixed fiber yarn that can give a unique texture and luster to a fabric.

(Means for Solving the Problems) That is, the present invention consists of two or more groups of polyester multifilaments having flat cross sections and different hot water shrinkage rates, and some or all of the filaments are made of bisphenol. A fiber containing at least one component of a mixture or a reaction product of a polyarylate (A) obtained from a terephthalic acid component and/or an isophthalic acid component and a fiber-forming thermoplastic polyester (B) The gist is a mixed fiber yarn with different shrinkage.

The polyarylate (A) in the present invention has the following general formula: (Here, X is a direct bond, -CH2-, -C-.

0 CH.

l -0-, -5O2-+ or -C-. ) and a terephthalic acid component and/or an isophthalic acid component. Polyarylate (A) is produced by the reaction (melt polycondensation) of bisphenol acetate and aromatic dicarboxylic acid (terephthalic acid and/or isophthalic acid),
It is a known polymer synthesized using the reaction of bisphenol and phenyl ester of aromatic dicarboxylic acid (melt polycondensation), the reaction of aromatic dicarboxylic acid chloride and bisphenol (melt polycondensation or interfacial polycondensation), etc. can be,
It may also contain small amounts (preferably up to 20% by weight) of other polyester-forming components. In addition, from the viewpoint of versatility and moldability, the molar ratio of bisphenol A and 9 is 20/80 ~
Preference is given to polyarylates obtained from a mixture of 80/20 terephthalic acid and isophthalic acid components. These polyarylates were prepared in Ig/d! in a 60/40 mixed solvent of phenol/tetrachloroethane. , the intrinsic viscosity (η1nh) measured at 30°C is 0.3 or more, especially 0.4
The above is preferable from the viewpoint of improving moldability and physical properties.

Next, the polyester (B) in the present invention is any fiber-forming thermoplastic polyester, and preferred polyesters include polyethylene terephthalate, polybutylene terephthalate poly-P-ethylene oxyhenzoate, polyethylene 2,6-naphthalate, and Examples include polyesters containing these as main components, and among them, polyethylene terephthalate or polyesters containing polyethylene terephthalate as a main component and 5-sodium sulfoisophthalic acid component as a copolymerization component are preferred in terms of versatility and differential shrinkage effect. .

The differential shrinkage mixed fiber yarn of the present invention has an important component of fibers containing a mixture of (A) and (B) or a small amount of a reactant, and this will be explained below.

First, the mixture or reactant of (A) and (B) is
(A) and (B) are simply physically mixed, or a block copolyester or random copolyester is formed by transesterification, etc., and the mixture and reactants are mixed. Of course, such a state can be obtained by melt-mixing (A) and (B) at any stage before melt-spinning. Also, what is the degree of mixing and reaction between (A) and (B)?

Temperature during melt mixing for 1 hour, addition of transesterification promoter (preferably alkali metal salts of fatty acids) 1 addition of reaction inhibitor (phosphoric acid, phosphorous acid, phosphonic acid or esters thereof), and mixing It can be adjusted appropriately by shearing force, etc. What should be noted here is the case of a heterogeneous mixture of (A) and (B) (this state is also included within the scope of the present invention).
When (A) is dispersed in (B) with a size on the order of μ or more, fine protrusions appear on the fiber surface, and texture effects such as crispness can be emphasized.

Secondly, in the present invention, "containing at least one component" refers to a case where the mixture or reactant of (A) and (B) above forms a single filament alone.

This means that it can be combined with other polymer components (preferably polyester (B)) to form a single filament, and the latter method is usually used from the viewpoint of fiber performance and spinning operability. Preferably, the fibers are formed by As this composite type, a core-sheath type, an island-in-the-sea type, a side-by-side split type, etc. can be applied. (A) and (B) in the mixture or reactants forming the fiber.
), taking into account the degree of heat treatment, the strength of the yarn, etc.

Weight ratio: 3/97 to 40/60. Preferably from 5/95
30/70, and the mixing temperature, reaction temperature, or spinning temperature is 230 to 320°C, preferably 250 to 300°C.
It is preferable that the temperature is ℃. In addition, when forming a composite form with another polymer, the composite ratio of the above mixture or reactant and the other polymer is 10/90 to 90/10 at a weight ratio of 9. The ratio is preferably 20/80 to 80/20.

Furthermore, it is important that the fiber cross section of the irregularly contracted mixed fiber yarn of the present invention is flat, and the ratio of the length in the major axis direction to the length in the minor axis direction is 2 to 10. Preferably it is 3-8.

Figures 1 (a) to (e) schematically show specific examples of the cross-sectional shapes of the fibers of the present invention (the case of composite yarns is shown), and the shaded areas indicate the components (, A). It is formed from a mixture or reactant of (B) and (B).

The irregularly shaped and irregularly shrunk mixed fiber yarn of the present invention can be obtained by two commonly known methods. That is, an undrawn multifilament obtained by spinning a mixture or a reaction product of (A) and (B) alone or by composite spinning with other polyester is divided into two or more groups, and heat treatment differences are applied in the drawing process. 2. For example, in the drawing process, one group of filaments is heat-treated, the other group of filaments is drawn without being heat-treated, and both groups are combined and wound (the heat treatment temperature, drawing ratio, etc. By controlling the hot water shrinkage rate, a desired hot water shrinkage rate can be imparted to the filament group.

The fiber containing at least one component of the mixture or reactant of (A) and (B) in the present invention is characterized by an extremely large change in hot water shrinkage rate due to the heat treatment, and 2. In the case of fiber yarn, the difference in hot water shrinkage rate is at most 20 to 25%, whereas in the case of the irregularly shaped and differentially shrinkable mixed fiber yarn of the present invention, it easily becomes 40 to 50%. The reason for this is not clear, but it is thought that the crystalline/amorphous structure of the polyester forming the fibers differs greatly from that of ordinary polyester due to the blackness of the polyarylate.

The irregularly contracted mixed fiber yarn of the present invention has a flattened cross section and a high degree of anomalous contraction, so it imparts unprecedented textures (e.g., fullness, squeaking, etc.) and luster (flash) effects to fabrics. It becomes possible to do so.

In particular, as mentioned above, if fine protrusions are formed on the fiber surface by using non-uniform mixing of (A) and (B), a unique texture can be created along with the effect of differential shrinkage mixed fibers. It can be expressed.

The irregular shrinkage mixed fiber yarn of the present invention is a fiber that is distinctive not only in the region where the difference in hot water shrinkage is large but also in the region where the difference in hot water shrinkage is low (30% or less). i.e. Boreal relay) (A)
This is because the introduction of F gives stiffness to the fibers, gives tension to the fabric, and gives it a firm feel.Finally, the difference in hot water shrinkage between the high-shrinkage filament group and the low-shrinkage filament group is 10 to 5.
A preferable range is about 0%.

In addition, the irregularly shaped and irregularly shrunk mixed fiber yarn of the present invention can be applied to ordinary polyester fabric. Perform so-called alkali weight loss treatment (
This is advantageous because the texture effect is often emphasized.

(Examples) Hereinafter, the present invention will be explained in more detail with reference to Examples. ("Parts" indicate parts by weight.) Example 1 Polyarylate (A) synthesized by an interfacial polycondensation method using bisphenol A and a terephthalic acid chloride/isophthalic acid chloride 50150 mixture (η1nh0.58 parts 5
Part, polyethylene terephthalate (B) (phenol/
In a 1/1 mixed solvent of tetrachloroethane, 85 parts (intrinsic viscosity at 25°C of 0.75) and bis(n-butyl)
Phosphe-1-(C) 0.05 part or 0 part was heated at 270°C for 1 hour using a twin screw mixer.
While melt-mixing for 2 minutes ordinary polyethylene terephthalate (D) (intrinsic viscosity 0.75) with another screw,
It melted at a temperature of 280°C. Next, a mixture of (A) and (B) and (D) were introduced into the same discharge hole at a weight ratio of 50:50.

Spinning is performed by adjusting the discharge amount so that the denier of the multifilament after drawing is 75 d from a 36-hole nozzle, so that the composite yarn has the cross-sectional shape shown in Figure 1 (a), and then the spinning Divide the yarn into two groups of 18 filaments each,
! 8 windings were carried out separately at a speed of 2500 m/min.

One of the obtained undrawn yarns was heated at a temperature of 90°C and a magnification of 1.85.
After drawing at 140°C or 180°C, the filament group (1)) was drawn, and the other undrawn yarn was drawn only under the same conditions (filament group ([]), (II
and (II) were combined and wound into the same pirn to obtain two irregularly shaped and irregularly shrunk mixed fiber yarns of the present invention.

During the above process, thread breakage hardly occurred, and the thread-spinning property was good. Table 1 shows the amount of bis(n-butyl) phosphate (C) added, the heat treatment temperature after stretching, and the fiber properties of the obtained yarn.

As is clear from Table 1, which yarns (test No.
1 to 4) also had a large difference in hot water shrinkage of 25% or more, and both had relatively good strength and elongation.

Next, the obtained irregularly contracted mixed fiber yarns were woven into taffeta (weaving density: 100 yarns/S for each warp and warp), and all of them (test grades 1 to 4) had a unique tension.

It had a waist, fullness and squeaking feeling, as well as a luxurious flash effect, and this texture was further accentuated when a 10% alkali weight loss treatment was applied. In addition, on the surface of the filament of test N [L3 and 1lkL4,
Many μ-order protrusions were observed, giving it a unique crunchy feel.

Chapter 1 Table (Comparative example) except that Borea Relay) (A) was not used.

The same operation as the test Nal was performed, but the difference in hot water shrinkage was 1
It was 1.2%.

In addition, the hot water shrinkage rate difference is determined by method A of J15-L-1013 (
This is the value measured by the skein shrinkage rate).

(Effects of the Invention) The irregularly contracted mixed fiber yarn of the present invention exhibits unique thermal acid-N behavior, giving the fabric obtained from it unprecedented tension, elasticity, fullness, and creaking, as well as a flash effect. be able to. It is relatively easy to manufacture and has relatively good filamentous properties, so it has great industrial value.

[Brief explanation of drawings]

FIGS. 1A to 1E are cross-sectional views schematically showing specific examples of the cross-sectional shapes of filaments constituting the yarn of the present invention. Patent applicant Unikorikiki Co., Ltd.
(1X for 2
)

Claims (2)

[Claims] (1) It is composed of two or more groups of polyester multifilaments that have a flat cross section and different hot water shrinkage rates, and some or all of the filaments are made of bisphenols and a terephthalic acid component and/or an isophthalic acid component. A irregularly shaped and irregularly shrunk mixed fiber yarn characterized in that it is a fiber containing at least one component of a mixture or a reaction product of the obtained polyarylate (A) and a fiber-forming thermoplastic polyester (B). (2) Polyarylate (A) is bisphenol A,
It is a polymer obtained from a mixture of a terephthalic acid component and an isophthalic acid component in a molar ratio of 20/80 to 80/20, and the polyester (B) is polyethylene terephthalate, polybutylene terephthalate, or has these as the main component. The irregularly shaped and irregularly shrunk mixed fiber yarn according to claim 1, which is polyester.