Carbonic diester, aromatic polycarbonate, production apparatus, and process for production

A manufacturing method, polycarbonate technology, applied in the reaction device of stainless steel alloy, the manufacture of novel aromatic polycarbonate, the manufacture of aromatic polycarbonate, the device field with specific oxide film layer, can solve the incomplete To solve problems such as to achieve the effect of excellent storage stability

Inactive Publication Date: 2000-09-13
TEIJIN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method still does not completely or not completely solve the problem

Method used

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  • Carbonic diester, aromatic polycarbonate, production apparatus, and process for production
  • Carbonic diester, aromatic polycarbonate, production apparatus, and process for production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0334] A raw material melting tank with a stirrer of the reaction device, wherein 99.5% of the normal-pressure gas in the distribution pipe placed directly in front of the raw material melting tank for supplying powdery aromatic dihydroxy compound to the raw material melting tank is nitrogen . The linear velocity is 5 cm / min, and the condenser whose internal temperature is maintained at 110° C. is connected to the exhaust port of the raw material melting tank, and the pressure of the gas phase part in the raw material tank is controlled at 0 MPa˜0.05 MPa. 2,2-Bis(4-hydroxyphenyl)propane and molten diphenyl carbonate were fed into the melting tank in a predetermined ratio of 1 mole of the former to 1.01 mole of the latter. After complete melting, the molten mixture was transferred to a raw material storage tank maintained at 150°C.

[0335] Next, at a speed of 60kg / hour, this molten mixture is continuously added to a vertical stirring tank equipped with a rectification tower, ...

Embodiment 2

[0338] Polymerization was performed in a similar manner to Example 1, except that a condenser whose internal temperature was kept at 90° C. was used and the gas phase pressure of the raw material melting tank was kept at 0 MPa to 0.01 MPa.

[0339] As a result, the quality of the polycarbonate was measured two days after production, and [η] was 0.35, and the b value was 0.01. Example 3

Embodiment 3

[0340] Polymerization was carried out in a manner similar to Example 1, except that the gas scrubber was used instead of the condenser and the gas phase pressure of the raw material melting tank was maintained at 0 MPa to 0.01 MPa.

[0341] As a result, the quality of the polycarbonate was measured two days after production, and [η] was 0.35, and the b value was -0.05. Comparative example 1

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Abstract

A process for producing through melt polymerization an aromatic polycarbonate reduced in coloring and improved in thermal stability, hue, etc. by keeping the pressure inside a starting-material dissolution vessel and the linear velocity of a gas in a transport piping in respective given ranges, keeping the concentration of a basic nitrogen compound in a specific range, recycling a by-product containing impurities in a specific amount, reducing the contents of nitrogen compounds, metallic elements, and salicylic acid derivatives in a carbonic diester to respective given values, using a reactor made of a specific material, and / or using a reactor having an oxide layer formed on the inner wall surface thereof.

Description

【Technical field】 [0001] The present invention relates to a method for producing a novel aromatic polycarbonate, and more specifically, relates to a method capable of producing a high-quality aromatic polycarbonate using a stable and economical melt polycondensation reaction method. [0002] Also, the method of the present invention is a method for producing an aromatic polycarbonate having excellent thermal stability and hue. [0003] In addition, the method of the present invention is in the method of producing aromatic polycarbonate by melt polycondensation reaction, and the monohydroxyl compound of the by-product produced by the melt polycondensation reaction is recycled as one of the solvents of the catalyst. A method for producing an aromatic polycarbonate. [0004] Also, the present invention relates to diester carbonate as raw material for the manufacture of aromatic polycarbonate and a method for producing aromatic polycarbonate produced therefrom. In more detail, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/30
CPCC08G64/307
Inventor 佐佐木胜司船越涉佐胁透平田滋己兼子博章阿部正典下成正志竹本英海松尾十峰松冈由记
Owner TEIJIN LTD
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