High molecular weight aromatic polycarbonate resin manufacturing method

Patent metadata

Field	Value
Publication number	US-2019119441-A1
Application number	US-201716088952-A
Country	US
Kind code	A1
Filing date	Mar 24, 2017
Priority date	Mar 30, 2016
Publication date	Apr 25, 2019
Grant date	—

Abstract

A high molecular weight aromatic polycarbonate resin manufacturing method that can achieve good quality and sufficiently high molecular weight includes: a step in which a dialcohol compound expressed by general formula (1) and a catalyst are mixed to obtain a catalyst composition; a step in which the obtained catalyst composition is transferred to a prepolymer mixing tank via a transfer pipe; a step in which the transferred catalyst composition and an aromatic polycarbonate prepolymer are mixed in the prepolymer mixing tank, under a pressure that is greater than or equal to the vapor pressure of the dialcohol compound at the temperature of the prepolymer mixing tank and is less than or equal to 5 MPa, to obtain a prepolymer mixture; and a high molecular weight achievement step in which the obtained prepolymer mixture is heat-treated under reduced pressure conditions to obtain a high molecular weight aromatic polycarbonate resin.

First claim

1 . A process for producing a high molecular weight aromatic polycarbonate resin which comprises the steps of:
mixing a dialcohol compound represented by formula (1) and a catalyst to obtain a catalyst composition, transferring the obtained catalyst composition to a prepolymer mixing tank through a transfer pipe, mixing the transferred catalyst composition and an aromatic polycarbonate prepolymer in the prepolymer mixing tank under a pressure of not lower than a vapor pressure of the dialcohol compound at a temperature of the prepolymer mixing tank and not higher than 5 MPa, to obtain a prepolymer mixture, and increasing a molecular weight of the prepolymer by subjecting the obtained prepolymer mixture to heat treatment under a reduced pressure to obtain a high molecular weight aromatic polycarbonate resin:

wherein, in formula (1), R 1 to R 4 each independently represent a hydrogen atom, a halogen atom or a linear or branched alkyl group having 1 to 5 carbon atoms; and Q represents a single bond or a substituted or unsubstituted divalent group comprising at least one member selected from the group consisting of an aliphatic group, an aromatic group, an oxygen atom, a sulfur atom, a sulfone group, a sulfoxide group, a carbonyl group, a dialkylsilyl group and a diarylsilyl group.

2 . The process according to claim 1 , wherein the catalyst composition is transferred to the prepolymer mixing tank in a temperature range of not lower than a temperature 5° C. above a melting point of the dialcohol compound and not higher than a temperature 250° C. above the melting point of the dialcohol compound.

3 . The process according to claim 1 or 2 , wherein the prepolymer mixture is obtained at a temperature not lower than a temperature at which the catalyst composition is transferred.

4 . The process according to claim 1 or 2 , wherein the prepolymer mixture is obtained at a temperature of not higher than a temperature 260° C. above the melting point of the dialcohol compound.

5 . The process according to claim 1 or 2 wherein the high molecular weight aromatic polycarbonate resin is obtained at a temperature of not lower than the temperature of the prepolymer mixing tank.

6 . The process according to claim 1 or 2 wherein the high molecular weight aromatic polycarbonate resin is obtained at a temperature of not higher than a temperature 80° C. above the temperature of the prepolymer mixing tank.

7 . The process according to claim 1 or 2 , wherein the catalyst is at least one member selected from the group consisting of an alkali metal salt and an alkaline earth metal salt.

Assignees

• Mitsubishi Gas Chemical Co

Inventors

• Isahaya Yoshinori
• Hirashima Atsushi
• Harada Hidefumi
• Ito Maki
• HAYAKAWA Jun-ya
• Isobe Takehiko
• Shinkai Yousuke
• Shimokawa Keisuke

Classifications

• C08G64/1608

  saturated · CPC title

• C08G64/30

  using carbonates · CPC title

• C08G64/04

  Aromatic polycarbonates · CPC title

• C08G64/06 Primary

  not containing aliphatic unsaturation · CPC title

• C08G64/305 Primary

  and alcohols · CPC title