High-fluidity polycarbonate copolymer, process for production highly polymerized aromatic polycarbonate resin and aromatic polycarbonate compound

Patent metadata

Field	Value
Publication number	US-10053537-B2
Application number	US-201615135063-A
Country	US
Kind code	B2
Filing date	Apr 21, 2016
Priority date	May 19, 2011
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

Copolymer having high fluidity and high molecular weight which is formed of a structural unit derived from an aliphatic diol compound and a structural unit derived from an aromatic dihydroxy compound. A polycarbonate resin composition is also provided comprising a highly polymerized aromatic polycarbonate resin as a main component and also comprising cyclic carbonate present in an amount of not more than 3000 ppm, wherein the highly polymerized aromatic polycarbonate resin is produced by a process which comprises a highly-polymerizing process wherein an aromatic polycarbonate is reacted with an aliphatic diol compound in the presence of a transesterification catalyst to increase the molecular weight.

First claim

The invention claimed is:

1. A polycarbonate resin composition comprising a highly polymerized aromatic polycarbonate resin having a weight average molecular weight (Mw) in the range from 5,000 to 60,000 as a main component and also comprising cyclic polycarbonate represented by the following general formula (h3), the cyclic carbonate being present in an amount of not less than 0.0005 ppm and not more than 3000 ppm:

wherein said Ra represents an ethyl group, and Rb represents a butyl group;
wherein the highly polymerized aromatic polycarbonate resin is produced by a process which comprises a highly-polymerizing process wherein an aromatic polycarbonate is reacted with an aliphatic diol compound represented by the following general formula (g3) in the presence of a transesterification catalyst to increase the molecular weight:

wherein Ra and Rb are as defined above.

2. The polycarbonate resin composition according to claim 1 , wherein said highly polymerized aromatic polycarbonate resin has a structural viscosity index (N-value) represented by the following mathematical formula (1) of 1.25 or less:
N -value=(log(Q160)−log(Q10))/(log 160−log 10)  (1)

wherein Q160 represents a melting fluid volume per unit time (ml/sec) measured under the conditions of 280° C. and 160 kg load, and Q10 represents a melting fluid volume per unit time (ml/sec) measured under the conditions of 280° C. and 10 kg load.

Assignees

• Mitsubishi Gas Chemical Co

Inventors

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

Classifications

• B29K2069/00

  Use of PC, i.e. polycarbonates {or derivatives thereof}, as moulding material · CPC title

• C08J2369/00

  Characterised by the use of polycarbonates; Derivatives of polycarbonates · CPC title

• C08G64/305

  and alcohols · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• C08G64/14

  containing a chain-terminating or -crosslinking agent · CPC title