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Modified polyester

A technology of polyester and ethylene glycol phthalate, which is applied in the field of modified polyester and its continuous manufacturing, can solve the problems of uneven physical properties of polymers, complex equipment, low production efficiency, etc., and achieve excellent operability, Excellent efficiency

Inactive Publication Date: 2005-11-30
SEIREN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the batch method is used, there will be the following problems: due to the aging change of polymer extrusion, the polymer viscosity at the beginning of extrusion and the polymer viscosity at the end of extrusion will be different, and if the number of batches is increased, the tank The polymer remaining in the interior is mixed with deteriorated foreign matter, which increases the difference in the physical properties of the polymer between batches
The countermeasure to improve these problems is to reduce the number of batches and blend polymer particles, but the production efficiency is low and low-cost production cannot be carried out
[0008] As a countermeasure against the above, for example, Japanese Unexamined Patent Publication No. 62-146921 proposes to use a direct continuous polymerization method, extract oligomers after esterification, and introduce them into a separate polymerization tank for production by batch polymerization. The polymerization reaction is changed to a batch mode, and there are also problems of uneven physical properties of the polymer, which cannot meet the needs, and complex equipment

Method used

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  • Modified polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Terephthalic acid, ethylene glycol, and SIPE (accounting for 2.3 mol% of the acid component) were put into a slurry tank, and 45 ppm of trimethyl phosphate and 600 ppm of sodium acetate trihydrate were added to the polymer. , and adjust the pH value of the slurry to 5.2, and then continuously supply the slurry to the first esterification tank for a pressurized reaction at 270 ° C and 68.6 kpa, and continuously supply it to the second esterification tank, to the low Add 10% by weight of polyethylene glycol with an average molecular weight of 8000, 0.3% by weight of IRGANOX 245 (manufactured by Ciba-Geigy) as a hindered phenolic antioxidant, and 400 ppm of trioxide dissolved in ethylene glycol to the polymer. Antimony, set the molar ratio in the second esterification tank to 1.14 and carry out the esterification reaction under normal pressure, then continuously transfer the slurry to the initial polymerization tank and the late polymerization tank, and carry out the reacti...

Embodiment 2

[0044] Embodiment 2, Comparative Examples 1-9

[0045] Except for the copolymerization amount, addition amount, and total molar ratio described in (Table 1), the same polymerization reaction as in Example 1 was performed to obtain a modified polyester polymer described in (Table 1). On the other hand, when the polymerization reaction was carried out under the same conditions as in Example 1 except that the total moles were set to 1.09, the polymer polymerization reaction could not proceed, and a modified polyester polymer could not be obtained.

[0046] Then, the ratio of this modified polyester polymer and common polyethylene terephthalate is 1:3 composite fibers are spun at a spinning speed of 3200 m / min to obtain 128 dtex / 25 filaments partially oriented composite fibers. Table 1 describes the respective spinning operability. On the other hand, using the conjugate fiber at a linear speed of 200 m / min and stretching at 1.5, the heater was changed to 180°C to 210°C and twist...

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Abstract

A polyester which has ethylene terephthalate units as main repeating units, is made up of monomer units wherein the acid units contain 2.0 to 3.0 mol% isophthalic acid units having a metal sulfonate group, and contains 9.0 to 13.0 wt.% polyalkylene glycol having an average molecular weight of 1,000 to 10,000 in the polymer, characterized in that the content of DEG units in all the glycol units is 4.7 to 5.7 mol% and that the ratio of the maximum of intrinsic viscosity, [ eta ]max, to the minimum thereof, [ eta ]min, is from 1.0 to 1.02. The modified polyester is reduced in viscosity decrease and coloration during melt spinning while retaining sufficient solubility in aqueous alkali solutions. It is excellent in spinnability and productivity.

Description

technical field [0001] The present invention relates to modified polyester which is very easily soluble in alkaline water and its continuous production method. In particular, it relates to an alkali soluble polyester with stable limit viscosity, spinning operability and silk physical properties, and a direct continuous polymerization production method of the alkali soluble polyester with high efficiency and low production cost. Background technique [0002] Alkali-soluble polyester is used as a constituent of a split-type conjugate fiber in which one component A is divided into a plurality of other components B. In terms of composite fibers, for example, disclosed in Japanese Patent Publication No. 63-20939 and Japanese Patent Publication No. 8-14042, it dissolves at least a part of the split components by alkali treatment, and uses them as split yarns to obtain extremely fine deniers. It is a composite fiber manufactured for the purpose of ultra-fine filaments. This compos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/688
CPCC08G63/6886C08G63/688
Inventor 胜间启太渡边隆彦吉田伸治酒井正弘高田真吾
Owner SEIREN CO LTD