0807657-A1 is referenced by 4 patents and cites 7 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
EP19960901489 19960131
Publication Number
0807657 (A1)
Application Date
January 31, 1996
Publication Date
November 19, 1997
Inventor
Kunishi Noriyuki
JP
Shishikura Akihiro
JP
Seino Yoshikatsu
JP
Suga Kouichi
JP
Tanaka Kenji
JP
Kuze Shigeki
JP
Assignee
Idemitsu Kosan Co
JP
IPC
C08G 64/30
C08G 64/22
C08G 64/00
C08G 64/30
C08G 64/24
C08G 64/22
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