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Method for producing polycarbonate, and polycarbonate pellets

A technology of polycarbonate and manufacturing method, applied in the field of polycarbonate, can solve the problems of resin coloring, low thermal stability and the like

Active Publication Date: 2013-12-18
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, dihydroxyl compounds such as ISB have lower thermal stability than bisphenols, and there is a problem of coloring the resin due to thermal decomposition when the polycondensation reaction is carried out at high temperature

Method used

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  • Method for producing polycarbonate, and polycarbonate pellets
  • Method for producing polycarbonate, and polycarbonate pellets
  • Method for producing polycarbonate, and polycarbonate pellets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0412] As above figure 1 As shown, polycarbonate was produced under the following conditions by a continuous production apparatus having three vertical stirred reactors and one horizontal stirred reactor. First, the reaction conditions of each reactor were previously set to the internal temperature and pressure shown in Table-1. Next, in a nitrogen atmosphere in another raw material preparation process, ISB, CHDM and DPC were mixed at a certain molar ratio (ISB / CHDM / DPC=0.500 / 0.500 / 1.010), and heated to 120° C. to obtain a raw material mixed melt.

[0413] [Table 1]

[0414]

temperature(℃)

Pressure (kPa)

Average residence time (minutes)

The first vertical stirred reactor

195

26.7

80

The second vertical stirred reactor

195

20.0

45

The third vertical stirred reactor

215

7.5

30

The fourth vertical stirred reactor

230

0.1

90

[0415] Then, the raw material mixed solution is ...

Embodiment 2

[0424] The inner temperature of the third vertical stirred reactor 6c was 210°C, and the average residence time was 15 minutes. Compared with Example 1, the molecular weight and melt viscosity at the outlet of the third vertical stirred reactor 6c were reduced. Same as in Example 1, the conditions of the 4th horizontal stirred reactor 6d were adjusted so that the reduced viscosity at the outlet was in the range of 0.68 to 0.70, and the conditions were that the pressure was 0.2kPa and the average residence time was 120 minutes. Items not mentioned were all carried out under the same conditions as in Example 1.

[0425] The color tone of the obtained polycarbonate was slightly inferior to that of Example 1 because the reaction time of the fourth horizontal stirred reactor, which had the highest temperature among the reactors, was longer. However, the content of the monohydroxy compound was small and the amount of foreign matter was very small.

Embodiment 3

[0427] The feed molar ratio of raw materials is ISB / CHDM / DPC=0.500 / 0.500 / 0.995. The conditions of the fourth horizontal stirred reactor 6d were adjusted in the same manner as in Example 1, the pressure was 1.0 kPa, and the average residence time was 90 minutes. Items not mentioned were all carried out under the same conditions as in Examples.

[0428] After the amount of hydroxyl end and phenyl carbonate end is balanced, the increase rate of molecular weight in the fourth horizontal reactor becomes faster and the pressure increases, so the content of monohydroxy compound in polycarbonate increases, the particle YI decreases, and the color tone is good.

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Abstract

When producing a polycarbonate using a specific dihydroxy compound having a -CH2-O- structure, the thermal stability is low compared to bisphenols. The present invention pertains to a method for producing a polycarbonate which solves a plurality of problems such as the abovementioned, wherein a polycarbonate with excellent characteristics, such as hue and mechanical properties, is produced with stable quality and high yields.

Description

technical field [0001] The present invention provides a method for efficiently and stably producing a polycarbonate having excellent transparency, color tone, heat resistance, thermal stability, light resistance, mechanical strength, and the like, and having few foreign substances. Background technique [0002] Polycarbonate generally uses bisphenols as a monomer component, which can exert advantages such as transparency, heat resistance, or mechanical strength. It is used as a so-called Engineering plastics are widely used. [0003] Conventionally, polycarbonate was manufactured using raw materials derived from petroleum resources, but in recent years, due to the crisis of depletion of petroleum resources, it is necessary to find a method that can provide polycarbonate using biological resources such as plants as raw materials. [0004] In addition, due to crises such as global warming and climate change caused by the increase in carbon dioxide emissions or storage, it is ...

Claims

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Application Information

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IPC IPC(8): C08G64/30
CPCC08G64/305C08G64/30C08J3/12C08L69/00
Inventor 并木慎悟小田康裕
Owner MITSUBISHI RAYON CO LTD
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