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Polyester, process for producing the same, fiber, and polymerization catalyst for polyester

A manufacturing method and catalyst technology, applied in the direction of one-component polyester rayon filament, etc., can solve the problems of reduced filament shrinkage, blockage of components, limited continuous running time, etc., and achieve excellent stretchability and false twist processability, The effect of suppressing the crystallization rate and reducing the number of broken ends

Inactive Publication Date: 2006-11-15
TEJIN FIBERS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, the following quality-related problems: in the production of polyester fibers, it is necessary to suppress and control the stretching of the yarn and the crystallization of polyester during processing, but as the spinning speed increases, directional crystallization becomes significant, Shrinkage of silk is extremely reduced
That is, when the spinning temperature is increased to improve the melt extrudability of the polymer, alkali decomposition occurs due to alkali metal salts or alkaline earth metal salts, or module clogging due to particle aggregation occurs, so continuous operation time is limited
[0010] As mentioned above, even if the polymer is modified by adopting past technology, the purpose of preventing end breakage during high-speed spinning cannot be achieved, which is the status quo

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0071] The following examples are given to illustrate the present invention more specifically, but the present invention is not limited thereto. The measurement of each characteristic in an Example and a comparative example was performed by the following method.

[0072] (1) Quantitative determination of antimony tetroxide and antimony pentoxide: The peaks derived from antimony were measured for each crystal form of the powder using an X-ray diffractometer manufactured by Rigaku Corporation, and obtained.

[0073] (2) Quantification of Pb, As, and Fe elements in antimony trioxide, antimony tetroxide, or antimony pentoxide: add concentrated hydrochloric acid to the sample, heat and dissolve, then use pure water to make constant volume, use (Co., Ltd. ) ICPS-8100 manufactured by Shimadzu Corporation, quantified metal components by ICP emission analysis (high-frequency plasma emission analysis) method.

[0074] (3) Intrinsic viscosity ([η]): Dissolve the sample in a mixed solven...

reference example 1

[0083] · Preparation of antimony trioxide (A1)

[0084] Continuously melt antimony trioxide (Pb content 300ppm, As content 300ppm, Fe content 5ppm) manufactured by Nippon Jingkuang Co., Ltd. at 700°C, send the liquid to the oxidation tank, and 3 / t-Sb 2 o 3 The hot air of the same temperature is sent in the same way, and the Pb component is removed. Then, after sending the liquid through the filter, the temperature was lowered to the melting point for 12 hours and crystallized to prepare antimony trioxide (A1) having the metal element content shown in Table 1.

reference example 2

[0086] · Preparation of antimony trioxide (A2)

[0087] Using antimony trioxide (Pb content 300ppm, As content 300ppm, Fe content 300ppm) produced by Mikuni Refining Co., Ltd., the amount of hot air sent was changed to 1.2m 3 / t-Sb 2 o 3 , and the cooling and crystallization time until the melting point was changed to 6 hours, except that the same operation as Reference Example 1 was carried out, and antimony trioxide (A2) with the metal element content shown in Table 1 was prepared.

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PUM

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Abstract

A polyester which stably forms fibers even in high-speed spinning and has a controlled crystallization rate. The polyester is one obtained in the presence of an antimony catalyst and is characterized in that the antimony catalyst comprises (i) diantimony trioxide and (ii) diantimony tetraoxide and / or diantimony pentaoxide, the amount of the ingredient being 1 to 10 wt.% based on the diantimony trioxide.

Description

technical field [0001] The present invention relates to polyesters with improved spinnability. In more detail, it relates to a polyester having a good color tone, which is produced using an antimony catalyst of a specific composition, has a suppressed crystallization rate, has little yarn breakage during high-speed spinning, is excellent in stretchability and false twist processability, and a method for producing the same. Moreover, this invention relates to the fiber which consists of this polyester. The invention also relates to catalysts for polyester polymerization. Background technique [0002] Polyester represented by polyethylene terephthalate is a raw material with high strength, high Young's modulus, and excellent thermal dimensional stability. Fibers made of polyester are widely used in clothing, industrial materials, etc. Furthermore, recently, by adopting high-speed spinning, the stretching and heat treatment processes that were necessary in the past have been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/86C08G63/183D01F6/62
CPCC08G63/183C08G63/866D01F6/62C08G63/00C08G63/86
Inventor 高濑透
Owner TEJIN FIBERS LTD
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