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Polybutylene terephthalate and method for production thereof, and composition comprising the same and film

A technology of polybutylene terephthalate and polybutylene phthalate, which is applied in the direction of chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve the problems of acceleration, heat resistance deterioration, poly Problems such as high concentration of butylene phthalate metals

Active Publication Date: 2008-11-19
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, due to the high concentration of metals in the finally obtained polybutylene terephthalate, the effect of reducing foreign matter or cloudiness is limited, and these metal compounds cause problems such as deterioration of the color tone of the polymer or deterioration of heat resistance (see Patent Document 4)
In addition, the above-mentioned increase in the concentration of terminal carboxyl groups at the time of melting is accelerated by the metal compound as a catalyst, which also has the disadvantage of deteriorating the hydrolysis resistance.

Method used

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  • Polybutylene terephthalate and method for production thereof, and composition comprising the same and film
  • Polybutylene terephthalate and method for production thereof, and composition comprising the same and film
  • Polybutylene terephthalate and method for production thereof, and composition comprising the same and film

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Embodiment 1

[0343] Through the esterification step shown in FIG. 1 and the polycondensation step shown in FIG. 6, PBT was produced in the following manner. First, a 60°C slurry in which 1,4-butanediol was mixed at a ratio of 1.80 mol with respect to 1.00 mol of terephthalic acid was continuously supplied at 41 kg / h to In the esterification reaction tank (A) which had the helical type agitator and filled the PBT oligomer of esterification rate 99% beforehand. At the same time, the bottom component of the rectification column (C) at 185° C. is supplied at 17.2 kg / h from the recirculation line (2), and tetrabutylene at 65° C. as a catalyst is supplied at 97 g / h from the catalyst supply line (3). 6.0% by weight of 1,4-butanediol solution (30 ppm relative to the theoretical polymer yield) of the base titanate. The moisture in this solution was 0.20% by weight.

[0344] The internal temperature of the reaction tank (A) is 230°C and the pressure is 78kPa. The generated water, tetrahydrofuran a...

Embodiment 2

[0350] In Example 1, it carried out similarly to Example 1 except having adopted the polycondensation process shown in FIG. As the filter (f) in the polycondensation step shown in FIG. 7 , a pleated cylindrical filter made of metal nonwoven fabric and having an absolute filtration accuracy of 20 μm was used. Compared with Example 1, the PBT which reduced foreign matter was obtained. The analytical values ​​are summarized in Table 1.

Embodiment 3 and Embodiment 4

[0352] In Example 1, except that the supply of tetrabutyl titanate was adjusted so that the titanium content in the polymer was as shown in Table 1, and the pressure of the second polycondensation reaction tank (d) was 100 Pa, the same method as in the implementation Example 1 was performed in the same manner. It is possible to obtain PBT with less foreign matter, excellent color tone, good transparency, and excellent thermal stability. The analytical values ​​are summarized in Table 1.

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PUM

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Abstract

A polybutylene terephthalate (PBT) which contains titanium and has a titanium content of 33 ppm or less; and a composition comprising the polybutylene terephthalate. In a preferred embodiment, the polybutylene terephthalate exhibits a crystallization temperature in the course of the decrease of temperature of 170 to 190 DEG C, has a concentration of a terminal vinyl group of 0.1 to 10 mueq / g, exhibits a haze of its specific solution of 10 % or less, exhibits an increase of the concentration of a terminal carboxyl group of 0.1 to 30 mueq / g after being heat-treated under specific conditions, and contains foreign particles having a size of 5 mum or larger in an amount of 50 pieces / 10 g-polymer or less. The PBT and a composition comprising the PBT are excellent in color tone, hydrolysis resistance, heat stability, transparency and processability, and is reduced in the content of foreign matter, and thus can be suitably used for a film, a monofilament, a fiber, an electric or electronic part, an automobile part or the like.

Description

technical field [0001] The present invention relates to polybutylene terephthalate and its production method as well as its composition and film. More specifically, the present invention relates to a polymer that is excellent in color tone, hydrolysis resistance, heat stability, transparency, and formability, and can reduce foreign matter, and is applicable to polymers such as films, monofilaments, fibers, electrical and electronic parts, and automotive parts. Butylene terephthalate, method for its manufacture, and compositions and films thereof. Background technique [0002] Polybutylene terephthalate, which is a representative engineering plastic among thermoplastic polyester resins, is difficult to process due to its ease of molding, mechanical properties, heat resistance, chemical resistance, fragrance retention, and other physical and chemical properties. It has excellent properties and is widely used in injection molded products such as automotive parts, electrical an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/85B32B27/36C08L67/02
Inventor 山本正规上坂贵洋藤野秀之足立政弘田尻敏之庄司英和杉浦克彦岸本伸太郎
Owner MITSUBISHI RAYON CO LTD
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