Modified cross-section polyester fibers

Inactive Publication Date: 2006-09-21
TEJIN FIBERS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0054] It is an essential feature of the modified cross-section polyester fibers of the invention that they are polyester fibers comprising a polyester polymer as the main component and having an modified cross-section, and that the polyester polymer is produced by polycondensation of an aromatic dicarboxylate ester in the presence of the specific catalyst described hereunder. This makes it possible to obtain modified cross-section polyester fibers having satisfactory color tone as well as no fluff and high quality, despite being spun from a spinneret with a complex discharge hole. In addition, since production can be stably accomplished from the polymer even if the modified cross-section polyester fibers have a high degree of irregularity, the fibers can exhibit adequate functions by their irregularity (water absorption, antifouling property, non-permeability) and hand (touch, color tone change, luster, etc.). The “modified cross-section” means a cross-sectional shape which is not a circular shape, such as an elliptical, flat, triangular, square, cross-shaped, star-shaped, C-shaped, H-shaped, I-shaped, L-shaped, S-shaped, T-shaped, U-shaped, V-shaped, W-shaped, X-shaped, Y-shaped or Z-shaped cross-section. The effect of the invention is more notably exhibited with complex cross-sectional shapes and modified cross-sections with strictly defined angles and dimensions of each portion of the cross-section.

Problems solved by technology

A problem is associated with the use of antimony compounds, however, because prolonged continuous melt spinning of polyesters results in accumulated adhesion of foreign matter around the spinneret hole (hereinafter referred to simply as “spinneret adhesion” and redirection of the molten polymer flow (bending), which ultimately lead to fluff and yarn breakage or mottling of the physical properties of filaments during the spinning and drawing steps.
Particularly when it is attempted to produce filaments with modified lateral cross-sections by melt spinning, the complex shape of the spinneret hole means that foreign matter on the spinneret has a greater influence on the discharge state of the molten polymer, while problems such as fluff and yarn breakage also occur during spinning.
While these methods do enhance the molten heat stability of polyesters to some degree, the enhancing effect is inadequate and the obtained polyester polymers are in need of color tone improvement.
However, although this method enhances the molten heat stability to some degree, the effect is inadequate and the obtained polyesters are in need of color tone improvement.

Method used

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  • Modified cross-section polyester fibers
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  • Modified cross-section polyester fibers

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Titanium Compound:

[0199] A 2 L three-necked flask equipped with a function allowing mixing and stirring of the contents was prepared, 919 g of ethylene glycol and 10 g of acetic acid were placed therein, and after stirring and mixing, 71 g of titanium tetrabutoxide was slowly added to obtain a (transparent) solution of a titanium compound in ethylene glycol. This solution will hereinafter be abbreviated as “TB solution”. The titanium atom concentration of the solution was 1.02%.

Preparation of Phosphorus Compound:

[0200] A 2 L three-necked flask equipped with a function allowing heating, mixing and stirring of the contents was prepared, and 656 g of ethylene glycol was placed therein and heated to 100° C. while stirring. Upon reaching 100° C., 34.5 g of monolauryl phosphate was added, and the mixture was heated, mixed and stirred to dissolution to obtain a transparent solution. This solution will hereinafter be abbreviated as “P1 solution”.

Preparation of Catalyst...

example 4

[0210] After charging 0.009 part by mass of tetra-n-butyl titanate (TBT) into a mixture of 100 parts by mass of dimethyl terephthalate and 70 parts by mass of ethylene glycol in a pressure reaction-capable stainless steel reactor, pressurization was conducted at 0.07 MPa for transesterification reaction while increasing the temperature from 140° C. to 240° C., and then 0.035 part by mass of triethyl phosphonoacetate (TEPA) was added to terminate the transesterification reaction.

[0211] The reaction product was then transferred to a polymerization reactor, the temperature was raised to 290° C., and polycondensation reaction was conducted in a high vacuum of no greater than 26.67 Pa to obtain polyethylene terephthalate. During the reaction, titanium dioxide was added as a delustering agent at 2.5 wt % based on the total weight of the polyester. The intrinsic viscosity of the polyethylene terephthalate was 0.62 and the diethylene glycol content was 1.5%. The obtained polyethylene terep...

examples 7-9

[0243] Preparation of a titanium compound, phosphorus compound and catalyst and production of an oligomer were carried out in the same manner as Example 1.

[0244] After transferring 225 parts by mass of the obtained oligomer to a polycondensation reactor, 3.34 parts by mass of the “TP1-2.0 catalyst” produced earlier was charged in as the polycondensation catalyst. The reaction temperature in the system was then raised from 255° C. to 280° C. and the reaction pressure was lowered from atmospheric pressure to 60 Pa in stages, for polycondensation reaction while removing out of the system the water and ethylene glycol generated by the reaction.

[0245] The extent of the polycondensation reaction was confirmed while monitoring the load on the stirring blade in the system, and the reaction was suspended when the desired degree of polymerization was reached. The reaction product in the system was then continuously extruded into a strand from the discharge port and then cooled and cut to ob...

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Abstract

Polyester fibers having a deformed section are produced from a polyester polymer which is obtained by polycondensing an aromatic dicarboxylate ester in the presence of a catalyst containing a mixture of a Ti component (A) comprising at least one a titanium alkoxide or a reaction product thereof with a specific carboxylic acid or its anhydride with a P compound component (B) represented by the following general formula (III) and / or a reaction product of a Ti compound component (C) with a P compound component (D) represented by the following general formula (IV). The obtained fibers have a favorable color tone and excellent qualities without showing fluffing.

Description

TECHNICAL FIELD [0001] The present invention relates to modified cross-section polyester fibers. More specifically, it relates to modified cross-section polyester fibers produced using a polyester polymer with satisfactory color tone and excellent moldability. BACKGROUND ART [0002] Polyester polymers, and particularly polyethylene terephthalate, polyethylene naphthalate, polytrimethylene terephthalate and polytetramethylene terephthalate, exhibit excellent mechanical, physical and chemical performance and are therefore widely used for fibers, films and other molded products [0003] Such polyester polymers, for example polyethylene terephthalate, are usually produced by first preparing an ethylene glycol ester of terephthalic acid and / or a lower polymer thereof and then heating it under reduced pressure in the presence of a polymerization catalyst for reaction to the desired degree of polymerization. Other polyesters are produced by similar processes. [0004] It is known that the type ...

Claims

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Application Information

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IPC IPC(8): D02G3/00C08G63/85C08G63/181C08K5/51D01D5/253D01F6/62
CPCC08G63/181C08G63/85C08K5/51D01D5/253Y10T428/2978Y10T428/2975Y10T428/2976Y10T428/2973D01F6/62
Inventor MASUDA, TSUYOSHIKAMIYAMA, MIEMIZUMURA, TOMOOMIYASAKA, NOBUYOSHITSUKAMOTO, RYOJIHATTORI, KEIJIRONAKAJIMA, SUGURUKIKUCHI, KATUSHIOSAKA, HIROYUKI
Owner TEJIN FIBERS LTD
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