Antistatic polyester false twisted yarn, process for its production, and antistatic special conjugated false twisted yarn comprising antistatic polyester false twisted yarn

Inactive Publication Date: 2009-12-17
TEJIN FIBERS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0075]If the molecular weight of the polymer is too low the effect of the invention described hereunder will tend to be reduced, and therefore the weight-average molecular weight is preferably at least 2000 and more preferably 5000-200,000. As specific examples that are particularly preferred there may be mentioned polymethyl methacrylate-based copolymers or isotactic polystyrene-based copolymers with a weight-average molecular weight of 8000-200,000 and a melt index A (measured according to ASTM-D1238, at a temperature of 230° C. and a load of 3.8 kgf) of 10-30 g / 10 min, and syndiotactic polystyrene-based copolymers with a weight-average molecular weight of 8000-200,000 and a melt index B (measured according to ASTM-D1238 at a temperature of 300° C. and a load of 2.16 kgf) of 6-50 g / 10 min. Such polymers are preferred because of their excellent thermostability and dispersion stability when molten and mixed with polyesters for melt spinning.

Problems solved by technology

However, because polyesters are hydrophobic, their use has been limited in fields that require antistatic properties.
When fibers are produced from these polyester compositions, however, even though normal fully oriented yarn (FOY) has an antistatic property, the false twisted yarn tends to generate fluff due to twisting deformation, and PET-based polyester false twisted yarn with practical antistatic properties has not yet been achieved.
Despite increasing demands for hand quality, feel and outer appearance of woven or knitted fabrics in recent years, however, fabrics that have been knitted or woven using conventional false twisted yarn have almost universally failed to exhibit antistatic properties that can prevent stinging static electricity.
In particular, antistatic PET-based polyester false twisted yarn fabrics do not yet exist that can be applied for preventing static electricity in student wear, uniforms and dustproof clothing, or for blouses or shirts that are in direct contact with the skin.

Method used

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  • Antistatic polyester false twisted yarn, process for its production, and antistatic special conjugated false twisted yarn comprising antistatic polyester false twisted yarn
  • Antistatic polyester false twisted yarn, process for its production, and antistatic special conjugated false twisted yarn comprising antistatic polyester false twisted yarn
  • Antistatic polyester false twisted yarn, process for its production, and antistatic special conjugated false twisted yarn comprising antistatic polyester false twisted yarn

Examples

Experimental program
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Effect test

examples

[0116]The present invention will now be explained in greater detail using examples and comparative examples. The measured values indicated in the examples were measured by the following methods. The term “parts” refers to “parts by weight” unless otherwise specified.

(1) Intrinsic Viscosity

[0117]The aromatic polyester composition was dissolved in ortho-chlorophenol and measured at 35° C. using an Ubbellohde viscosity tube.

(2) Spinning Yarn Breakage

[0118]Melt spinning was carried out for one week with a melt spinning apparatus, and the number of yarn breaks was recorded for evaluation of the number of spinning yarn breaks per spindle per day. However, artificial or mechanical yarn breaks were excluded from the yarn breakage count.

(3) Birefringence

[0119]An optical microscope and compensator were used according to an ordinary method to determine the retardation of polarized light obtained on the surface of the fibers.

(4) Transit Angle

[0120]The yarn running on the false twisting disc was...

examples 1-3

, Comparative Examples 1-5

[0140]After charging 100 parts of dimethyl terephthalate, 60 parts of ethylene glycol, 0.06 part of calcium acetate monohydrate (0.066 mol % with respect to dimethyl terephthalate) and 0.013 part of cobalt acetate tetrahydrate (0.01 mol % with respect to dimethyl terephthalate) into a transesterification can, the temperature of the reaction product was raised from 140° C. to 220° C. over a period of 4 hours under a nitrogen gas atmosphere, and transesterification was carried out while removing from the system the methanol produced in the reaction can. Upon completion of transesterification, 0.058 part of trimethyl phosphate (0.080 mol % with respect to dimethyl terephthalate) was added as a stabilizer and 0.024 part of dimethylpolysiloxane was added as an antifoaming agent to the reaction mixture.

[0141]After 10 minutes, 0.041 part of antimony trioxide (0.027 mol % with respect to dimethyl terephthalate) was added to the reaction mixture, the temperature was...

examples 4-6

, Comparative Examples 6-7

[0152]The polyester unstretched filament obtained in Example 2 was subjected to stretching and false twisting under the conditions shown in Table 2, to obtain polyester false twisted yarns with the physical properties shown in Table 2. The stretching and false twisting yarn breakage and fluff generation are also shown in Table 2. The polyester false twisted yarns were evaluated for quality by the method described above, giving the results shown in Table 2.

TABLE 2ExampleExampleExampleComp.Comp.456Ex. 6Ex. 7Lowermost disc contact1.52.50.52.70.3length (mm)Spinning yarn breakage336351( / day)Stretching / false4575193twisting yarn breakage( / day)Textured yarn fluff35848151( / 104 m)Weaving property:Interruptions ( / day)2232863Percentage crimp (%)1415161715False twisted yarn3.33.43.02.82.4strength (cN / dtex)False twisted yarn2223211812ductility (%)Hand quality / soft feel11133(rankAntistatic property1528235851Method A (sec)Antistatic property11001090125018001900Method B (V)...

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Abstract

An unstretched filament composed of a PET-based aromatic polyester multifilament comprising a polyoxyalkylene-based polyether and an organic ionic compound is subjected to simultaneous stretching and false twisting under specified conditions to produce a polyester false twisted yarn, whereby rapid and stable false twisting can be accomplished without section deformation or fluff generation during false twisting, and the resulting yarn has a highly satisfactory hand quality and a fibrillation resistant fiber structure, while also exhibiting a highly durable antistatic property.Interlacing of the unstretched filament with an unstretched polyester filament comprising a polymethyl methacrylate-based polymer and / or polystyrene-based polymer and stretching / false twisting thereof under specified conditions allows rapid and stable production of conjugated false twisted yarn exhibiting highly satisfactory bulkiness and a spun feel with the absence of fluff, as well as a highly durable antistatic property. The finished yarn is particularly useful for purposes that require static electricity to be inhibited, such as student wear, uniforms, dustproof clothing and the like.

Description

TECHNICAL FIELD[0001]The present invention relates to a polyester false twisted yarn with an antistatic property, to a process for its production, and to antistatic special conjugated false twisted yarn comprising the antistatic polyester false twisted yarn. More specifically, the invention relates to polyester false twisted yarn with excellent durability and an antistatic property, to a process for rapid and stable production of the false twisted yarn, and to antistatic special conjugated false twisted yarn having a core-sheath structure that comprises the antistatic polyester false twisted yarn.BACKGROUND ART[0002]Polyester, and especially polyethylene terephthalate or aromatic polyesters composed mainly thereof (hereinafter referred to as PET-based polyesters) have a wide range of excellent characteristics and are therefore widely used as molding materials for fibers, films, sheets and the like. However, because polyesters are hydrophobic, their use has been limited in fields tha...

Claims

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Application Information

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IPC IPC(8): D02G3/02D02G3/44D02G1/04D02G1/16
CPCD01F6/92D02G1/0266D02G1/06D02G1/082D02J1/08D02G1/02D02G3/02
Inventor YANAGIHARA, MASAAKINAKAJIMA, SUGURU
Owner TEJIN FIBERS LTD
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