Title:
低含量の揮発性化合物を有するポリカーボネートのトランスエステル化法による製造方法
Document Type and Number:
Japanese Patent JP2007513229
Kind Code:
A
Abstract:
A multi stage process for the production of polycarbonates having low monomer content is disclosed. The process entails, in sequence, (i) transesterifying in the melt at least one dihydroxyaryl compound with at least one diaryl carbonate in the presence of at least one onium catalyst to produce a polycondensate that contains monomers, (ii) introducing into the polycondensate an inhibitor in an hypostoichiometric amount in relation to the catalyst and (iii) reducing in a finishing reactor the content of monomers in said polycondensate. The polycarbonate thus produced is characterized in that it contains less than 350 ppm of diphenyl carbonate, less than 40 ppm of 2,2-bis-(4-hydroxyphenyl)propane and less than 150 ppm of phenol.
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Inventors:
Uwe Fuchs
Melanie Metrat
Helmut-Werner Heuer
Thomas Koenig
Lydia Jimon
Marc Butts
Johann van den einde
Melanie Metrat
Helmut-Werner Heuer
Thomas Koenig
Lydia Jimon
Marc Butts
Johann van den einde
Application Number:
JP2006541846A
Publication Date:
May 24, 2007
Filing Date:
November 24, 2004
Export Citation:
Assignee:
Bayer MaterialScience AG
International Classes:
C08G64/30; C08G64/00; C08G64/04; C08G64/06; C08G64/14; C08G64/20; C08G64/40
Domestic Patent References:
| JP2004526839A | 2004-09-02 | |||
| JP2004523647A | 2004-08-05 | |||
| JPH07165905A | 1995-06-27 | |||
| JPH11302228A | 1999-11-02 | |||
| JP2003147186A | 2003-05-21 | |||
| JPH07126374A | 1995-05-16 |
Attorney, Agent or Firm:
Aoyama Aoi
Muneo Yamamoto
Muneo Yamamoto