公开(公告)号：DE69227786D1

公开(公告)日：1999-01-14

申请号：DE69227786

申请日：1992-03-17

Applicant: DAICEL CHEM

Inventor： YAMATO TSUTOMU ,  KUWANA TAKAAKI ,  OSHINO YASUHIRO ,  OKANO YOSHIMICHI ,  FUKUDA YUTAKA ,  KANNO TATSUYA

IPC: C08G64/30

Abstract: The present invention refers to a process for producing a polycarbonate by transesterification, which comprises reacting a dihydroxyl compound with a diester of carbonic acid in a reactor made of stainless steel and treated by electropolishing on a surface part thereof to contact the reactants.

公开(公告)号：DE69229653D1

公开(公告)日：1999-09-02

申请号：DE69229653

申请日：1992-03-17

Applicant: DAICEL CHEM

Inventor： YAMATO TSUTOMU ,  OSHINO YASUHIRO ,  FUKUDA YUTAKA ,  KANNO TATSUYA ,  KUWANA TAKAAKI ,  OKANO YOSHIMICHI

IPC: C08G64/30

Abstract: The present invention refers to a process for producing a polycarbonate by transesterification, which comprises reacting a dihydroxyl compound with a diester of carbonic acid in a reactor made of stainless steel and treated by electropolishing on a surface part thereof to contact the reactants.

公开(公告)号：DE69229653T2

公开(公告)日：1999-12-02

申请号：DE69229653

申请日：1992-03-17

Applicant: DAICEL CHEM

Inventor： YAMATO TSUTOMU ,  OSHINO YASUHIRO ,  FUKUDA YUTAKA ,  KANNO TATSUYA ,  KUWANA TAKAAKI ,  OKANO YOSHIMICHI

IPC: C08G64/30

Abstract: The present invention refers to a process for producing a polycarbonate by transesterification, which comprises reacting a dihydroxyl compound with a diester of carbonic acid in a reactor made of stainless steel and treated by electropolishing on a surface part thereof to contact the reactants.

公开(公告)号：DE69229088T2

公开(公告)日：1999-08-26

申请号：DE69229088

申请日：1992-02-28

Applicant: DAICEL CHEM

Inventor： YAMATO TSUTOMU ,  OSHINO YASUHIRO ,  FUKUDA YUTAKA ,  KANNO TATSUYA ,  KUWANA TAKAAKI

IPC: C08G64/30 ,  C08G64/20

公开(公告)号：DE69229088D1

公开(公告)日：1999-06-10

申请号：DE69229088

申请日：1992-02-28

Applicant: DAICEL CHEM

Inventor： YAMATO TSUTOMU ,  OSHINO YASUHIRO ,  FUKUDA YUTAKA ,  KANNO TATSUYA ,  KUWANA TAKAAKI

IPC: C08G64/30 ,  C08G64/20

公开(公告)号：DE69227786T2

公开(公告)日：1999-04-22

申请号：DE69227786

申请日：1992-03-17

Applicant: DAICEL CHEM

Inventor： YAMATO TSUTOMU ,  KUWANA TAKAAKI ,  OSHINO YASUHIRO ,  OKANO YOSHIMICHI ,  FUKUDA YUTAKA ,  KANNO TATSUYA

IPC: C08G64/30

Abstract: The present invention refers to a process for producing a polycarbonate by transesterification, which comprises reacting a dihydroxyl compound with a diester of carbonic acid in a reactor made of stainless steel and treated by electropolishing on a surface part thereof to contact the reactants.

公开(公告)号：EP0577849A4

公开(公告)日：1995-03-01

申请号：EP93902544

申请日：1993-01-28

Applicant: DAICEL CHEM

Inventor： OKANO YOSHIMICHI ,  KANNO TATSUYA ,  YAMATO TSUTOMU ,  OSHINO YASUHIRO ,  TANIGAWA MICHIYO ,  KUWANA TAKAAKI ,  FUKUDA YUTAKA

IPC: C08G64/14 ,  C08G64/30 ,  C08K5/06 ,  C08K5/13 ,  C08L69/00

CPC classification number: C08G64/14 ,  C08G64/30 ,  C08G64/307

公开(公告)号：JPH069770A

公开(公告)日：1994-01-18

申请号：JP21711191

申请日：1991-08-28

Applicant: DAICEL CHEM

Inventor： OSHINO YASUHIRO ,  YAMATO TSUTOMU

IPC: C08G64/30 ,  C08G64/20 ,  C08G64/40

Abstract: PURPOSE:To efficiently produce a colorless high-mol.-wt. polycarbonate by cooling, in an inert gas flow, a high-mol.-wt. polycarbonate melt obtd. by a specific melt polycondensation method. CONSTITUTION:A dihydroxy compd. [e.g. a compd. of formula I, II, III, or IV (wherein R1 to R4 are each H, 1-8C alkyl, or phenyl; X is halogen; n is 0-4; and m is 1-4)] is polycondensed in melt with a bisaryl carbonate (e.g. bisphenyl carbonate) by transesterification to give a polycarbonate resin melt, which is cooled by blowing to it an inert gas below the temp. of the resin melt. Thus, the surface of the resin is cooled to a temp. not allowing the oxidation of the surface and an almost colorless high-mol.-wt. polycarbonate resin is obtd.

公开(公告)号：JPH05202179A

公开(公告)日：1993-08-10

申请号：JP1364392

申请日：1992-01-29

Applicant: DAICEL CHEM

Inventor： OKANO YOSHIMICHI ,  YAMATO TSUTOMU

IPC: C08G64/04 ,  C08G64/00 ,  C08G64/20 ,  C08G64/30

Abstract: PURPOSE:To obtain a high-molecular polycarbonate free from coloration, containing no chloride ion causing coloration and having no branched structure produced by side reaction by carrying out transesterification. CONSTITUTION:The objective polycarbonate is produced from a dihydric phenol such as bisphenol A and a carbonic acid diester such as diphenyl carbonate by carrying out transesterification in the presence of a nitrogen-containing basic compound catalyst. The straight-chain polycarbonate free from coloration and branched structure produced by side reaction can be obtained by this producing method.

公开(公告)号：JPH05148353A

公开(公告)日：1993-06-15

申请号：JP31473691

申请日：1991-11-28

Applicant: DAICEL CHEM

Inventor： YAMATO TSUTOMU ,  SUGANO TATSUYA

IPC: C08G64/30

Abstract: PURPOSE:To produce a colorless transparent high-molecular polycarbonate industrially at high efficiency by effecting the melt polycondensation of a dihydroxy compound with a bisaryl carbonate by transesterification. CONSTITUTION:The above transesterification is performed in a reaction apparatus made of a ceramics. A colorless transparent high-molecular polycarbonate can be produced and can find a use where it can fully exhibit its transparency.