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Polybutylene terephthalate
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A technology of polybutylene terephthalate and methoxycarbonyl, which is applied in the field of polybutylene terephthalate, can solve problems such as toxicity, and achieve the effect of reducing impurities and excellent formability
Active Publication Date: 2008-10-08
MITSUBISHI RAYON CO LTD
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Abstract
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Problems solved by technology
However, the methoxycarbonyl terminal generates methanol, formaldehyde, and formic acid by heat generated by solid-state polymerization, kneading, molding, etc., and there is a problem of toxicity of these substances when used in food applications.
In addition, formic acid damages metal manufacturing molding machines or vacuum-related machines, etc.
Method used
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Embodiment 1
[0200] Through the esterification step shown in FIG. 1 and the polycondensation step shown in FIG. 4 , PBT was produced in the following manner. First, 1.80 moles of PBT will be produced with 1,4-butanediol relative to 1.00 moles of terephthalic acid. First, a 60°C slurry mixed with 1.00 mol of terephthalic acid in a ratio of 1.80 mol of 1,4-butanediol is passed from the slurry preparation tank through the raw material supply pipe (1) at a speed of 41kg / h. It was continuously supplied to the reaction tank (A) for esterification which had the rotary type agitator which filled the PBT oligomer of 99% of esterification rate beforehand. At the same time, the bottom component of the rectification column (C) at 185° C. is supplied from the recirculation pipe (2) at a rate of 20 kg / h, and the catalyst at 65° C. is supplied from the catalyst supply pipe (3) at a rate of 230 g / h. A 6.0% by weight solution of tetrabutyl titanate in 1,4-butanediol (70 ppm relative to the theoretical pol...
Embodiment 2
[0207] Row. As the filter (f) in the polycondensation step shown in FIG. 5 , a flat cylindrical filter including a metal nonwoven fabric and having an absolute filtration accuracy of 20 μm was used. Obtained the PBT that the impurity further reduces in embodiment 1. The analysis values are summarized in Table 1.
Embodiment 3
[0209] In embodiment 1, in addition to adjusting the feed rate of tetrabutyl titanate as shown in Table 1 according to the Ti content in the polymer, the bottom component of the rectification column (C) is supplied at a speed of 22kg / h. 2 The residence time of the polycondensation reaction tank (d) was set to 70 minutes, and it carried out similarly to Example 1. PBT with few impurities, excellent color tone, and good transparency was obtained. The analysis values are summarized in Table 1.
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Abstract
A polybutylene terephthalate (PBT) which contains a titanium catalyst in a content up to 150 ppm as a titanium atom and has a terminal methoxycarbonyl group content of 0.5 mu eq / g or less, wherein a value (alpha) indicating the proportion of an active titanium in the titanium catalyst is 0.8 or more, which is represented by the following formula (I): alpha = X / [M] wherein [M] represents the concentration (ppm) of a titanium atom in PBT, and X represents an activity parameter defined by a specific formula. The above PBT is excellent in color tone, the resistance to hydrolysis, thermal stability, transparency and formability and is reduced in the content of a 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. Specifically, it relates to excellent color tone, hydrolysis resistance, heat stability, transparency, and moldability, and reduces impurities, and can be suitably used for films, monofilaments, and fibers. , polybutylene terephthalate for electrical and electronic parts, automotive parts, etc. Background technique [0002] Among thermoplastic polyester resins, polybutylene terephthalate, a representative engineering plastic, is easy to mold and process, and has excellent mechanical properties, heat resistance, chemical resistance, fragrance retention, and other physical and chemical properties. Therefore, it is widely used in injection molded products such as automobile parts, electrical and electronic parts, and precision machine parts. In recent years, it has been widely used in fields such as films, sheets, monofilaments, and fibers by taking advantage of its excellent properties. [00...
Claims
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