05922826 is referenced by 13 patents and cites 14 patents.

There are disclosed a process for producing a polycarbonate through transesterification which comprises using, as a polymerization catalyst, (1) a combination of a nitrogen-containing organic basic compound and a quaternary phosphonium salt, (2) a tetraarylphosphonium salt having a specific chemical structure, or (3) a quaternary phosphonium salt having a specific chemical structure and containing a branched alkyl group; and a process for producing a polycarbonate which comprises the steps of preparing a polycarbonate prepoplymer by preliminary polymerization and thereafter polymerizing the resultant prepolymer in a state of a solid phase by the use of a quaternary phosphonium salt as a catalyst.

By using any of these processes it is made possible to produce, in extremely high efficiency, a high-quality polycarbonate being excellent in appearance, heat resistance, hydrolysis resistance and the like.

Title
Process for producing polycarbonate
Application Number
8/875402
Publication Number
5922826
Application Date
July 31, 1997
Publication Date
July 13, 1999
Inventor
Noriyuki Kunishi
Ichihara
JP
Akihiro Shishikura
Sodegaura
JP
Yoshikatsu Seino
Sodegaura
JP
Kouichi Suga
Sodegaura
JP
Kenji Tanaka
Sodegaura
JP
Shigeki Kuze
Sodegaura
JP
Agent
Oblon Spivak McClelland Maier & Neustadt P C
Assignee
Idemitsu Kosan
JP
IPC
C08G 64/00
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