DIESTER CARBONIQUE, POLYCARBONATE AROMATIQUE, APPAREIL DE PRODUCTION ET PROCEDE DE PRODUCTION

N° de brevet: EP0992522 (A1)
Date de publication: 2000-04-12
Inventeur(s): SASAKI KATSUSHI [JP];FUNAKOSHI WATARU [JP];SAWAKI TORU [JP];HIRATA MASUMI [JP];KANEKO HIROAKI [JP];ABE MASANORI [JP];SIMONARU MASASI [JP];TAKEMOTO HIDEMI [JP];MATSUO JYUHOU [JP];MATSUOKA YOSHIKI [JP];
Demandeur(s): TEIJIN LTD [JP];
Classification: C08G64/30;
N° de demande: EP19990917100 19990422 
Numéro(s) de priorité: WO1999JP02141 19990422;JP19980116864 19980427;JP19980201695 19980716;JP19980260102 19980914;JP19980260103 19980914;JP19980268231 19980922;JP19990050174 19990226 
Résumé dans la langue de publication Aromatic polycarbonate having a reduced discoloration and improved heat stability, hue, etc. is provided by keeping a pressure in a raw material melting vessel and the linear velocity of a gas in a transporting piping in a specific range, keeping the concentration of a nitrogen-containing basic compound in a specific range, recycling a byproduct containing specific amounts of impurities, suppressing the amounts of a nitrogen-containing basic compound, metallic elements and a silicic acid derivative in the carbonic acid diester at specific values or less, prescribing the material quality of the reaction facilities, and/or forming an oxide layer at the inner wall surfaces of the reaction facilities.

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