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Manufacturing method of polycarbonate resin

A technology of polycarbonate resin and manufacturing method, which is applied in the direction of instruments, optical components, optics, etc., can solve the problems of poor thermal stability of raw materials, decline of polycarbonate resin commodity value, poor thermal stability of dihydroxy compounds, etc., and achieve excellent transparency sex, excellent hue effect

Active Publication Date: 2018-01-09
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, such a dihydroxy compound having a special structure has poor thermal stability, and if it is used as a raw material of polycarbonate resin, the polymerization reactivity decreases, or coloring occurs due to the thermal history during raw material preparation and polymerization, so The problem of causing a decrease in the commercial value of the obtained polycarbonate resin
Especially when it is desired to produce polycarbonate resin on an industrial scale, it is necessary to heat the raw material and hold it for a certain period of time from the viewpoint of heat conduction, production efficiency, and production stability, so the thermal stability of the raw material is poor. become a serious problem

Method used

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  • Manufacturing method of polycarbonate resin
  • Manufacturing method of polycarbonate resin
  • Manufacturing method of polycarbonate resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0198] Isosorbide (ISB) in a solid state and tetramethylammonium hydroxide pentahydrate ( TMAH), disodium hydrogen phosphite pentahydrate of 1 weight ppm, heated with a heat medium. Stirring was started when melting started and stirring was possible, the entire amount was uniformly melted, and the inner temperature was brought to 80°C. After 12 hours from the start of melting, the ISB in the molten state was sampled in a porcelain plate, water-cooled to solidify, then heat-sealed in an aluminum laminated bag under nitrogen gas, and stored in a refrigerator.

[0199] The obtained samples were subjected to various analyzes according to the methods described above. The nitrogen atom content of ISB was 3.7 wtppm, and the sodium atom content was 0.2 wtppm. The amount of formic acid contained in ISB was 1.3 ppm by weight, furfural was 13 ppb by weight, pH was 7.7, and solution YI was 0.55.

[0200] The ISB thus obtained was placed in a container equipped with a stirring blade und...

Embodiment 2

[0206] When melting ISB, only 50 weight ppm of TMAH was added with respect to ISB, and disodium hydrogen phosphite pentahydrate was not added, It carried out similarly to Example 1.

[0207] The ISB after melting at 80°C for 12 hours had a nitrogen atom content of 3.8 wtppm and a sodium atom content of less than 0.1 wtppm. The amount of formic acid contained in ISB was 1.2 ppm by weight, furfural was 12 ppb by weight, the pH was 7.4, and the solution YI was 0.51, showing the same level of storage stability as in Example 1.

[0208] After 129 minutes from the start of the reaction in the second polymerization reactor (second tank), the given stirring power was reached. The reduced viscosity of the obtained polycarbonate resin was 0.464 dL / g, the particle YI was 11.3, and the hue was slightly improved compared with Example 1. The results are shown in Table 1.

Embodiment 3

[0210] When melting ISB, only 100 weight ppm of TMAH was added with respect to ISB, and disodium hydrogen phosphite pentahydrate was not added, It carried out similarly to Example 1.

[0211] The ISB after melting at 80°C for 12 hours had a nitrogen atom content of 7.6 wtppm and a sodium atom content of less than 0.1 wtppm. In addition, the amount of formic acid contained in ISB was 1.2 ppm by weight, furfural was 15 ppb by weight, pH was 7.6, and solution YI was 0.54, showing the same level of storage stability as in Example 1.

[0212] After 108 minutes from the start of the reaction in the second polymerization reactor (second tank), the given stirring power was reached. The reduced viscosity of the obtained polycarbonate resin was 0.474 dL / g, the particle YI was 13.4, and the hue was about the same as that of Example 1. The results are shown in Table 1.

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Abstract

The present invention provides a method for producing a polycarbonate resin, the method comprising the following steps: using a dihydroxy compound and a carbonic acid diester as raw material compounds, polycondensing them by transesterification in the presence of a transesterification catalyst, wherein, The dihydroxy compound contains at least an aliphatic dihydroxy compound having an ether oxygen atom at at least one β-position or γ-position of the hydroxyl group, and the raw material compound contains a nitrogen-containing compound, which is relative to the The weight concentration of the aliphatic dihydroxy compound in terms of nitrogen atoms is 0.3 ppm to less than 10 ppm, and the method for producing the polycarbonate resin further includes the step of preheating the aliphatic dihydroxy compound to 50° C. or higher , kept in a molten state for more than 0.5 hours and less than 200 hours, and then mixed with carbonic acid diester.

Description

technical field [0001] The present invention relates to a method for efficiently and stably producing a polycarbonate resin excellent in light resistance, transparency, hue, heat resistance, thermal stability, and mechanical strength and stable in performance. Background technique [0002] Polycarbonate resin usually uses bisphenols as a monomer component, and effectively utilizes its advantages such as transparency, heat resistance, and mechanical strength, and is used as a so-called Engineering plastics have been widely used. However, in the application of optical compensation films such as flat panel displays that are rapidly spreading recently, higher optical characteristics such as low birefringence and low photoelastic coefficient are required, and conventional aromatic polycarbonate resins cannot meet this requirement. Require. In addition, conventional polycarbonate resins have been manufactured using raw materials derived from petroleum resources, but in recent ye...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G64/30
CPCG02B1/04C08G64/305C08L69/00C08G64/30C08G64/02
Inventor 并木慎悟山本正规
Owner MITSUBISHI RAYON CO LTD
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