JPS59216919A - Antistatic synthetic fiber - Google Patents

Abstract

PURPOSE:To provide the titled synthetic fiber having high durability and excellent antistaticity, and composed of a thermoplastic polymer and a block copolymer containing a polyalkylene oxide component, wherein said block copolymer is embedded in said thermoplastic polymer in the form of plural strip layers elongated continuously along the fiber axis. CONSTITUTION:The objective synthetic fiber composed of (A) a thermoplastic polymer (e.g. polyethylene terephthalate) and (B) a block copolymer containing polyalkylene oxide component and embedded in the component (A) in the form of plural strips elongated continuously along the fiber axis, is manufactured by the composite melt-spinning of both components through a spinneret for mixed spinning. The amounts of polyalkylene oxide component in the component (B) and in the fiber are preferably 10-90wt% and 0.5-30wt%, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synthetic fiber with excellent antistatic properties.

It is well known that the introduction of polyalkylene oxide compounds is effective in suppressing static electricity damage in synthetic fiber products such as polyester and polyamide. In particular, a method of blending a block copolymer consisting of a polyalkylene oxide component and a polyester or polyamide component is said to be optimal for obtaining durable textured yarns.

However, when the block copolymer is introduced into fibers by the usual blending method, the polyalkylene oxide component tends to be restricted in the fiber molecules, resulting in reduced mobility and difficulty in producing an antistatic effect.

In order to avoid this problem, a fiber has been proposed, for example, as in Japanese Patent Publication No. 57-4724, in which a block copolyade ester containing a boria-kylene oxide V-do component is dispersed in a sushi-like shape along the fiber axis direction. However, even this is not sufficient to prevent a decrease in the mobility of the polyalkylene oxide component, and static electricity damage is likely to occur at low humidity such as in winter.

The present inventors have conducted various studies in order to provide an antistatic synthetic fiber that eliminates the above-mentioned drawbacks.

The inventors have discovered that by further localizing the polyalkylene oxide component-containing block copolymer and allowing it to exist in the fiber so as to form a band-like layer, a fiber having excellent antistatic properties can be obtained, and the present invention has been achieved.

That is, the present invention provides a fiber comprising a thermoplastic polymer (A) and a polyalkylene oxide component-containing block copolymer CB), in which [B] forms a plurality of bands substantially continuous in the fiber axis direction ( The gist is an antistatic synthetic fiber characterized by being blended in A).

In the present invention, the thermoplastic polymer (A) includes polyethylene terephthalate, polyethylene terephthalate, polyp-ethyleneoxybenzoate, etc., and polyesters containing these as main components, nylon 6, nylon 12.
Nylon 46. Preferred are nylon 66, nylon 610, etc., polyamides containing these as main components, polyethylene, polypropylene, etc., and polyolefins containing these as main components.

Next, in the present invention, the polyalkylene oxide component-containing block copolymer CB) means a block copolymer in which boriakylene oxide segments such as polyethylene oxide, polypropylene oxide, and ethylene oxide-propylene oxide copolymers are copolymerized.

Specifically, when synthesizing polyester and/or polyamide, a droxyl group and a μ boxy p group are used.

Preferred are those obtained by adding a boria μ-kylene oxide compound having one or more (preferably two) ester- or amide-forming functional groups such as a p-oxycarbonyl group or amino group.

Specific examples of components forming polyester μ and/or polyamide include adipic acid, sebacic acid terephthalic acid,
Isophthalic acid, naphthalic acid, 5-alkali meta/I/(
Dicarboxylic acid components such as sodium or potassium) isophthalic acid, diol components such as ethylene glycol-/I/, propylene glycol, 1,4-butanedio-μ, diethylene glycol, 1,4-cyclohexane dimetatool, xylylene glycol, p -V carboxylic acid components such as β-hydroxybenzoic acid, diamine components such as detoxamethylene diamine, hexamethylene diamine, xylylene diamine, and ε-aminocaproic acid.

Examples include amino acid components such as ω-aminododacanic acid, and lactam components such as ε-cabroctam and tucrine lactam. The polyalkylene oxide has a molecular weight of 400 to 20,000. Preferably 800-10,00
0 is suitable, and the amount in the block copolymer CB) is preferably from 10 to 90% by weight, preferably from 20 to 70% by weight.

Also, as the polyalkylene oxide, modified polyalkylene oxide 1 such as bispheno-A/A can be used.

Compounds obtained by adding alkylene oxide to bisphenol-p compounds such as bisphenol S are heat resistant.

It is preferable to use a hydrophilic component such as 5'-alkali metal sulfoisophthalic acid or H,N'-bis(amino-n-globil)pivarazine as a polyester or polyamide-forming component from the viewpoint of improving antistatic properties, or to use a block copolymer. Adding an organic or inorganic electrolyte or other ionic compound to the block copolymer has the advantage of increasing the antistatic activity of the block copolymer.

It is preferable that the #1 polymers [A] and CB) have as much affinity (adhesion) as possible (poor affinity makes it easy for the fibers to fibrillate)9 Usually, polyester and block polyether ester Combinations such as polyamide and block polyether amide, 5-alkali metal sulfoisophthalic acid component copolymerized polyester and block polyether amide are selected, but depending on the intended use of the fiber, active fibrillation may be required [A].
It is also possible to create a combination that makes the affinity between CB and CB poor.

In the present invention, the block copolymer CB) has a plurality of band shapes in the cross section of the fiber, and the fiber axis direction tc5
i! It is characterized in that it is qualitatively continuously blended into the thermoplastic polymer (A), and as shown in FIGS. It is band-shaped,
This shape has a structure in which the fibers are connected in the axial direction. At this time, it is appropriate that the number of bands be 6 or more, preferably 5 or more, but it is necessary to avoid a state where the number of bands is extremely increased, that is, a state close to fine dispersion.

Considering the antistatic effect, spinning properties, yarn properties, etc., the amount of [B] introduced into the fiber is 0.5 to 30% by weight, preferably 1 to 2% by weight.
0% by weight is suitable.

Also, the obi part does not necessarily have to be CB) alone,
Other polymer components may be included to the extent that the antistatic effect is not impaired. (In this case, the band part is CB) concentration is 50
Power to make it more than % by weight: Good. ) Fibers having the form of the present invention can be obtained by a known melt spinning method.

For example, the polymer (A) and the block copolymer CB) are melted separately, introduced into a static mixer (the number of mixing elements is preferably 3 to 8; too many elements tend to cause fine dispersion), and then mixed. The fiber of the invention is a fiber in which the polymer CA) and the block copolymer [B] are blended in a special form. It goes without saying that the fibers of the present invention also include fibers that are compositely spun with a combined component into a bimetal μ shape, a core-sheath shape, a seabird shape, or the like. Also, flame retardant
Of course, the present invention will be explained in more detail with reference to Examples below. The antistatic properties in the examples were measured using a 9-Kyoto University Kaken type rotary touch tester at 20°C and 40°C using M cloth as the friction body.
%RH atmosphere to determine the frictional charging voltage and half-life. (“Parts” indicate parts by weight.) Example 1゜fV7 Oligomer obtained by esterification reaction of tarric acid and ethylene glycol (number average degree of polymerization: 4) 60 parts 9 Polymer having droxyl groups at both ends 40 parts of ethylene oxide (average molecular weight 5,500) and 0.0 parts of antimony trioxide.
0.2 parts (used as a 2% solution of ethylene glycol) was charged to the reactor, and 0.2 parts of ethylene glycol was added to the reactor.

Polycondensation was performed at 270°C for 3 hours to obtain a block copolymer (B, ).

Melt (&) at 270C with an extruder.

The weight ratio of ((At) and [BI3 is 92:8, the number of static mixing elements is 6) is introduced into ordinary polyethylene tele in a separate extractor, and is spun as it is at a temperature of 280°C.
1 # 0 wound at 500 m/win, then stretched at a temperature of 90°C at a magnification of 5.2 times, and heat set at 150°C to produce a drawn yarn of 75d156f, strength 4.6 g/d, elongation 35.4% I got it. There were almost no problems such as yarn breakage, and the yarn spinning performance was good.

The above drawn yarn was refined after tube knitting at a density of 40 (17 d),
Dyeing was carried out at 165° C. for 30 minutes in a bath containing a blue disperse dye. The obtained dyed cloth has a frictional charging voltage of 900 V,
It exhibits a half-life of 8 seconds, and this performance exceeds 50% of home laundry.
No deterioration occurred even after repetition.◎As another spinning experiment, [BI3 was blended with 0.5% by weight of carbon black particles and mixed and spun with [N] in the same manner as above. When the cross section of the naturally falling thread was observed under a microscope, it had a shape as shown in FIG.

Comparative Example 1 The mixed polymer stream exiting the stationary mixing element in Example 1 was passed through a 78 mesh wire mesh, then spun, spun and drawn. The antistatic property of the obtained drawn yarn was measured in the same manner as in Example 1.

The frictional charging voltage of dyed cloth is 2,000 V, and the half-life is 10
◎ Also, in this case, microscopic observation of the free-falling yarn obtained by blending carbon black particles with (Bl) revealed that there was no band formation ((Bt) had fine sushi-like formations in the fiber axis direction. It was found that there was a large dispersion.

Example 2 Bispheno-/l/ as a polyalkylene oxide component
Ethyl V-oxide adduct of A (average molecular weight 4.000)
The block copolymer [B,] synthesized using (:B
The same operation as in Example 1 was performed except that 1) was used instead of 1).

The dyed fabric showed a frictional charging voltage of 700 V and a half-life of 4 seconds.
Example 3 35 parts of polyethylene oxide (average molecular weight 5,500) having amino groups at both ends, N, Nl-t's (7
5 parts of minor n-propyl pipefudine, 3 parts of adipic acid.
After obtaining a copolymerized polyamide CB,) from 5 parts of 5 parts and 56.5 parts of cabrok tam by a conventional melt polycondensation method, 5-
A chip containing (ns) was obtained by melt-mixing the sodium sulfoisophthalic acid component with 50 parts of polyethylene terephthalate copolymerized with 2 mo/l/% at 280°C.

This chip was used in place of [B1], and almost the same operation as in the example was performed. Adjust the weight ratio of (Bl ) and (At ) to be 6:94. ) The obtained dyed cloth exhibited a frictional charging voltage of 5 oov and a half-life of 6 seconds.

Examples 4 to 7 In Example 2, yarn was produced by changing the mixing ratio of the block copolymer [Ma] and polyethylene terephthalate [A1], weaving, scouring, and dyeing were performed, and the antistatic performance was measured.

As shown in Table 1, it was confirmed that the fibers of the present invention exhibited good antistatic performance.

Table 1 Examples 8-10. Comparative Examples 2 and 3 Table 2 shows the results of the same operation as in Example 1 except that the number of static mixing elements was changed.

In the carbon black blend test! l! Examples 8-10
Formation of a band-like layer was observed in Comparative Examples 2 and 3, but no band was observed in Comparative Examples 2 and 3, and the CB) component was finely dispersed in the form of streaks. Combining this phenomenon with the results in Table 1, it can be seen that the formation of bands has a large effect on the antistatic effect.

Table 2

[Brief explanation of the drawing]

Figures 1 to 3 show specific examples of the fibers of the present invention - tips b). FIG. 3 is a diagram schematically showing a cross section. Patent Applicant Unitika Co., Ltd. No. 10 Me 20 Figure 3 Procedural Amendment (Voluntary) 1. Indication of the Case Japanese Patent Application No. 58-91223 2. Name of the Invention Antistatic Synthetic Fiber 3. Person making the amendment Related Patent Applicant Address 1-50 Higashihonmachi, Amagasaki City, Hyogo Prefecture 54
1 Address: 4-68 Kitakyutabe-cho, Higashi-ku, Osaka Name: Unitika Co., Ltd. Telephone: 06-281-5258 (dial-in) 4, "Detailed Description of the Invention" column 5 of the specification to be amended, Contents of the amendment (1) "Antistatic" on page 2, line 11 of the specification is corrected to "antistatic." (2) Change "78" from page 10, line 13 of the same page to r78. O.J.
I am corrected. (3) On page 12, line 7, "weaving" is corrected to "knitting."

Claims (4)

[Claims] (1) A fiber consisting of a thermoplastic polymer (A) and a block copolymer CB containing a boria μquine oxide component, in which [B] forms a plurality of bands substantially continuous in the fiber axis direction CA) An antistatic synthetic fiber that is characterized by being blended inside. (2) (A) is polyester or polyamide. The fiber according to claim 1, wherein CB) is a polyester and/or polyamide block copolymer. (3) Claim 1, wherein the polyalkylene oxide component is an akylene oxide V-dos adduct of binuphenols.
Fibers as described in Section. (4) The content of the polyalkylene oxide component in CB) is 10 to 90% by weight, and the content of the polyalkylene oxide component in the fiber is 0.5 to 50% by weight. The fiber according to claim 1, wherein the fiber has a band shape with [1° (5) CB) of 3 or more.