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Method of manufacturing polycarbonates

A technology of polycarbonate and carbonic diester, applied in the field of polycarbonate production, can solve the problem that the polymerization rate is not completely satisfactory

Inactive Publication Date: 2004-11-03
SABIC GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rate of polymerization obtained by the disclosed method is not entirely satisfactory

Method used

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  • Method of manufacturing polycarbonates
  • Method of manufacturing polycarbonates
  • Method of manufacturing polycarbonates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、10、33

[0157] The equipment for polycarbonate polymerization includes on the stirring tank to mix raw materials, two pre-polymerization tanks and two horizontal polymerization tanks. device such as figure 1 shown in . The conditions for each reaction are shown in Table 1 below.

[0158] Pressure (Torr)

temperature(℃)

average dwell time

(Hour)

Mixing tank

Atmospheric pressure (nitrogen atmosphere)

160

2

Pre-polymerization tank I

100

230

1

Pre-polymerization tank II

20

270

0.5

Horizontal polymerization tank I

2

305

0.5

Horizontal polymerization tank II

0.5

305

0.5

[0159] The molten bisphenol A is directly connected to the bisphenol A production device through the pipe (supply rate, 36.0kg / hr); after distillation, the molten diphenyl carbonate is directly added through the pipe (the supply rate, 34.7kg / hr); an...

Embodiment 2～9

[0162] Working examples 2~9, comparative examples 1~9

[0163] Polycarbonate was also produced by a method similar to Working Example 1, but using a different type and / or different amount of catalyst. The results are presented in Table 2.

[0164] catalyst

Embodiment 20

[0170] The device for polycarbonate polymerization is equipped with a stirring tank for mixing raw materials, two pre-polymerization tanks and two horizontal polymerization tanks. Various reaction conditions are given below.

[0171] Pressure (Torr)

[0172] The amount of phenolic solution of 0.5% sodium hydroxide added was adjusted so that the alkalinity shown corresponded to the amount shown in Table 5, expressed as NaOH per mole of bisphenol A produced in the bisphenol A production plant, directly from the tube Pumped molten bisphenol A (feeding rate: 36.0kg / hr), molten diphenyl carbonate pumped directly from the pipe after distillation (feeding rate: 35.5kg / hr), and decomposed at 100~300℃ The phenolic solution of the catalyst was continuously supplied in the amounts shown in Table 5 to a stirred tank maintained at the temperature given above. Next, the phenolic solution of the alkali metal phosphite catalyst of the specified amount is continuously supplied to ...

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Abstract

The manufacture of polycarbonates can be accomplished via an ester interchange reaction of a dihydroxy compound and a carbonic acid diester. The method, which can be a single or multi-stage process wherein the total amount of alkali metal compounds and alkaline earth metal compounds contained as impurities is 1 x 10<-7> moles or less per mole of dihydroxy compound used as raw materials, and the catalyst employed is an ammonium and / or phosphonium compound, a compound which decomposes or volatilizes at a temperature of 100 to 300 DEG C, and / or an alkali metal phosphorous containing inorganic salt and / or alkaline earth metal phosphorous-containing inorganic salt.

Description

[0001] This application is a U.S. non-provisional application based on and claiming priority from: Japanese Application Nos. HEI10-313705, HEI10-313706, HEI10-313707, and HEI10-313708, which are incorporated herein by reference. Background of the invention [0002] The present invention relates to a process for the production of polycarbonates by transesterification. More specifically, it relates to a process for the production of high molecular weight aromatic polycarbonates with improved color by transesterification of aromatic dihydroxy compounds with carbonic acid diesters. [0003] Recently, aromatic polycarbonates have been widely used as engineering plastics in many fields due to their excellent mechanical properties such as high impact resistance and other excellent characteristics such as heat resistance and transparency. [0004] The industrial production of aromatic polycarbonates uses the so-called phosgene process, whereby aromatic dihydroxy compounds such as bisp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G64/30
Inventor T·施莫达A·伊克达T·基穆拉P·J·麦洛斯基H·H·M·豪特
Owner SABIC GLOBAL TECH BV