JPH0457918A - Conjugate yarn - Google Patents

Abstract

PURPOSE:To obtain the title conjugate yarn having excellent heat resistance, etc., ready spinnability, stable in cold water, capable of being woven by utilizing mutual sticking of yarns and water flow, comprising a water-soluble polyester copolymer having a specific composition and a water-insoluble fiberforming polymer. CONSTITUTION:The objective conjugate yarn consisting of a water-soluble polyester copolymer A comprising terephthalic acid and/or an ester-forming derivative (terephthalic acid component) thereof and isophthalic acid and/or an ester-forming derivative (isophthalic acid) thereof in 30/70 to 70/30 (molar ratio), 5-15mol% (based on total dicarboxylic acid components) sulfonate- containing dicarboxylic acid and/or an ester-forming derivative, an alicyclic dicarboxylic acid and/or an ester-forming derivative and >=50mol% (based on total glycol components) ethylene glycol and a water-insoluble fiber-forming polymer.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to composite fibers that can be obtained by dissolving and removing water-soluble polyester used as one component, and can obtain ultrafine fibers or special irregular cross-section yarns. It is.

[Conventional technology]

It has been known for a long time to obtain ultrafine fibers or yarn with a special cross-section by removing one component of composite fibers. There are methods such as disassembling and removing it. However, these methods have drawbacks such as the use of special solvents and complicated processes.

Furthermore, it is possible to use water-soluble polyester as the component to be removed to facilitate removal, as disclosed in, for example, JP-A No. 63-25661.
This is proposed in Publication No. 9. That is, a water-soluble polyester consisting of a terephthalic acid component, an isophthalic acid component, an isophthalic acid component having a sulfonate thereof, and ethylene glycol is shown.

However, when using a water-soluble polymer as a component of composite fiber, there are problems: 1. It has a problem with its solubility in low-temperature water, and if it dissolves easily, it may cause stickiness in the yarn due to emulsion on the spinning oil side during spinning, or it may cause trouble in weaving in a jet loom using a water stream. In this respect, the water-soluble polyester proposed in the above-mentioned publication cannot be said to be sufficient.

[Problem that the invention seeks to solve]

The object of the present invention is to use a water-soluble copolymer that is easily soluble in hot water but extremely poorly soluble in cold water or does not easily cause stickiness as a component of the composite fiber, thereby achieving good spinnability and ease of subsequent processing. The objective is to provide a composite fiber that is easy to handle.

[Means for solving problems]

The inventors of the present invention have arrived at the present invention as a result of intensive studies in order to obtain a conjugate fiber that partially contains a component that has the contradictory properties of water solubility and water resistance as described above. That is, the above object of the present invention is to: (^) Terephthalic acid and/or its ester-forming derivative (terephthalic acid component) and isophthalic acid and/or its ester-forming derivative in a molar ratio of 30/70 to 70/30. isophthalic acid component), (B) 5 to 15 mol% of dicarboxylic acid having a sulfonate salt and/or its ester-forming derivative based on the total dicarboxylic acid component, (C) alicyclic dicarboxylic acid and/or its ester-forming derivative. ester-forming derivative, and (D) ethylene glycol to 5% of the total glycol component.
This is achieved by a composite fiber characterized by comprising a water-soluble polyester copolymer having at least four compositions of 0 mol % or more, and a water-insoluble fiber-forming polymer.

It is particularly preferable that the molar ratio of the terephthalic acid component and the isophthalic acid component used in the present invention is 30/70 to 70/30 from the viewpoint of solubility in water. It is more preferable to contain 50 to 80 mol% of the acid component.

Furthermore, as the dicarboxylic acid and/or its ester-forming derivative for growing the sulfonic acid salt used in the present invention, those having an alkali metal sulfonic acid base are particularly preferable.
For example, alkali metal salts of 4-sulfoisophthalic acid, 5-sulfoisophthalic acid, sulfoterephthalic acid, 4-sulfophthalic acid, 4-sulfonaphthalene-2,7-dicarboxylic acid, 5-[4-flufophenoxy]isophthalic acid, etc. 5-sulfoisophthalic acid sodium salt or its ester-forming derivatives are particularly preferred.These dicarboxylic acids having a sulfonic acid group and/or their ester-forming derivatives are water-soluble and 5 to 5 for all dicarboxylic acid components in terms of water resistance.
It is contained within a range of 20 mol%, particularly preferably from 6 to 12 mol%.

Examples of alicyclic dicarboxylic acids and/or ester-forming derivatives thereof include 1,4-cyclohexanedicarboxylic acid, 1
．． 3-cyclohexanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 1,3-cyclopentanedicarboxylic acid, 4,4'-bicyclohexyldicarboxylic acid,
Or these ester-forming derivatives are used, but it is preferable to use them in an amount of 10 moles or more based on the total dicarboxylic acid components.

In addition, in the present invention, aromatic dicarboxylic acids or ester-forming derivatives thereof may be used as dicarboxylic acid components other than the above in an amount of 30 mol% or less of the total dicarboxylic acid components. Examples of these dicarboxylic acid components include phthalate, etc. acid, 2,5-dimethylterephthalic acid, 2,6-naphthalene dicarboxylic acid, 1,4-naphthalene dicarboxylic acid,
Examples include aromatic dicarboxylic acids such as biphenyldicarboxylic acid, and ester-forming derivatives thereof. In addition, a linear aliphatic dicarboxylic acid or its ester-forming derivative may be used within a range of 10 mol% or less of the total dicarboxylic acid component. Examples of such dicarboxylic acid component include adipic acid, pimelic acid, and suberin. Examples include aliphatic dicarboxylic acids such as azelaic acid and sebacic acid, and ester-forming derivatives thereof. If the amount of the linear aliphatic dicarboxylic acid component is too large, it will not only be easy to block but also have poor water resistance.

In the present invention, from the viewpoint of spinnability of the polyester copolymer, 50% ethylene glycol is added to the total glycol component.
Use mol% or more. In addition to ethylene glycol, glycol components include 1.4-butanediol, neopentyl glycol, and ■.

4-cyclohexane dimetatool, diethylene glycol, triethylene glycol, polyethylene glycol, etc. may be used in combination.

Various conventional methods can be used to polymerize the copolyester of the present invention. For example, after transesterifying dimethyl ester of dicarboxylic acid and glycol and distilling off methanol, the pressure is gradually reduced to a high temperature. A method of performing polycondensation under vacuum, or a method of performing an esterification reaction of dicarboxylic acid and glycol, distilling the generated water, and then gradually reducing the pressure and performing polycondensation under high vacuum.
Alternatively, when dimethyl ester of dicarboxylic acid and dicarboxylic acid are used together as raw materials, conduct transesterification reaction between dimethyl ester of dicarboxylic acid and glycol, further add dicarboxylic acid to perform esterification reaction, and then perform mold condensation under high vacuum. There is a way to do it.

As the transesterification catalyst, manganese acetate, calcium acetate, zinc acetate, etc. can be used, and as the polycondensation catalyst, known ones such as antimony dioxide, germanium oxide, dibutyltin oxide, titanium tetrabutoxide, etc. can be used.

In addition, phosphorus compounds such as trimethyl phosphate and triphenyl phosphate, and hindered phenol compounds such as Irganox 1010 may be used as stabilizers. However,
Various conditions such as the polymerization method, catalyst, and stabilizer are not limited to the above-mentioned examples.

The polyester copolymer used in the present invention is water-soluble, and the term "water-soluble" as used in the present invention includes those that are dissolved and/or finely dispersed in water.

The water-insoluble fiber-forming polymer used in the composite fiber of the present invention includes polyethylene terephthalate, polybutylene terephthalate or a copolymer thereof, polycaproamide, polyhexamethylene, leneadipamide or a copolymer thereof, It refers to all polymers that can be melt-spun, such as polyolefins such as polyethylene and polypropylene, or copolymers thereof.

Since the water-soluble polyester copolymer used in the present invention has excellent thermal stability and spinnability, composite fibers can be easily obtained by ordinary melt spinning methods.

The components constituting the composite fiber may be two components, three components, or more.Also, there are various forms of composite fibers, but for example, the first
By using water-soluble polyester as component A in the figure and removing component A, a large number of ultrafine fibers can be obtained, and fibers with sharp cross sections and/or ultrafine fibers can be obtained from the composite fibers in Figure 2. , a yarn with a special irregular cross section can be obtained from the composite fiber shown in FIG.

〔Effect of the invention〕

The composite fiber of the present invention has (1) heat resistance and thermal stability of the water-soluble polyester used;
It has excellent spinnability and is easy to spin.

(2) Cold water (approximately 40'll) of water-soluble polyester to be used
:) has almost no water solubility or stickiness, so threads hardly stick together due to the spinning oil emulsion used during spinning.

(3) Since it is stable against cold water, there is no need to worry about any troubles occurring during weaving using a water jet loom that utilizes water flow.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to Examples.

The obtained composite fibers were evaluated by the following method.

(1) Water Solubility: Composite fibers were placed in 95° C. hot water at a bath ratio of 10/1 for 3 minutes to elute water-soluble components for evaluation.

(2) Adhesion: When undrawn yarn obtained by spinning was unwound, adhesion between yarns was evaluated in the following manner.

◎: There is no problem with unwinding O: Some sticking is observed, but there is no problem with drawing △: Sticking causes poor unwinding and yarn breakage occurs during drawing ×: Unwinding is not possible Example 1 For composite spinning The following copolymerized polyester was polymerized.

38.74 parts by weight of dimethyl terephthalate, 31.95 parts by weight of dimethyl isophthalate, 10.34 parts by weight of dimethyl 5-sulfoisophthalate, 54.48 parts by weight of ethylene glycol, 0.07 parts by weight of calcium acetate hydrate.
3 parts by weight, 0.024 parts by weight of manganese acetate tetrahydrate were subjected to transesterification at 170 to 220°C under a nitrogen stream while distilling methanol off, followed by 0.05 parts by weight of trimethyl phosphate and a polycondensation catalyst. as antimony dioxide 0
．． 4 parts by weight of 1,4-cyclohexanedicarboxylic acid and 17 and 17 parts by weight of 1,4-cyclohexanedicarboxylic acid were added, and approximately the theoretical amount of water was distilled off at a reaction temperature of 220 to 235°C to carry out esterification.

After that, the pressure inside the reaction system was further reduced and the temperature was increased to a final temperature of 280°C.
, 0.2 mmHg for 2 hours.

The obtained copolymer is referred to as copolymer tal.

Polyethylene terephthalate and copolymer (al) were subjected to composite spinning using a known composite spinning method. That is, polyethylene terephthalate/copolymer (al) was mixed in a volume ratio of 2/
1, and a copolymer (Al) was used as the component A in the cross section shown in Figure 2.
It was wound up at a speed of 0.00 m/min while applying a water emulsion containing 15% spinning oil. This undrawn yarn was stretched 3.2 times using a hot stretching roller at 80°C to 100d150.
A drawn yarn of f was obtained. The obtained yarn is made into a composite filament (a
Let it be l.

In addition, polyester copolymers ~)~(el) were composite-spun in the same manner as above, except that the composition was changed as shown in Table 1, to obtain composite filament piles)~(il+), respectively.

The evaluation results of the obtained composite filament are shown in Table 1.
As is clear from Table 1, the composite filament of the present invention +
al-fcl were excellent in terms of water solubility and adhesiveness.

Example 2 Composite spinning was performed using the copolymer of Example 1 (C1 and polycaproamide).

That is, the volume ratio of polycaproamide/copolymer fc) is 4
/l, and using the copolymer tel as the A component in the cross section as shown in Figure 1, the number of A components is set to 20, and 2
The material was wound from a spinneret plate at 80.degree. C. at a speed of 1,000 m/min while applying a water emulsion containing 18% spinning oil.

This undrawn yarn was stretched 3.4 times to 100 d/36
A drawn yarn of f was obtained. The obtained yarn is made into a composite filament (f
Let it be l.

The spinning and drawing properties are good, and the composite filament (f) is 95
Ultrafine polycaproamide multifilament of 80 d/720 f can be obtained by immersing it in water at ℃ for 2 minutes to remove the copolymer tc+.

[Brief explanation of the drawing]

Claims (1)

Scope of Claims: (A) Terephthalic acid and/or its ester-forming derivative (terephthalic acid component) and isophthalic acid and/or its ester-forming derivative (isophthalic acid component) in a molar ratio of 30/70 to 70/30. component), (B) 5 to 15 mol% of dicarboxylic acid having a sulfonic acid salt and/or its ester-forming derivative based on the total dicarboxylic acid component, (C) Alicyclic dicarboxylic acid and/or its ester-forming property derivatives, and (D) 5% of ethylene glycol relative to the total glycol component.
A conjugate fiber comprising a water-soluble polyester copolymer having at least 0 mol % of at least four compositions, and a water-insoluble fiber-forming polymer.