Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1992-06-19
1993-11-02
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
526 64, 528198, 528199, C08G 6424
Patent
active
052584844
ABSTRACT:
A process for the continuous production of a thermoplastic aromatic polycarbonate is disclosed. Accordingly, in a reactor system which includes a tube reactor and a tank equipped with a stirrer, there are reacted a preheated dialkali diphenolate aqueous solution with gaseous phosgene in CH.sub.2 Cl.sub.2 and/or in chlorobenzene solution containing excess phosgene, in a mixer to form a mixed emulsion. The emulsion is then transported at least partly against the force of gravity into the tube reactor to facilitate a polycondensation reaction and in which after a residence time of at least 10 seconds and without dissipation of the heat of reaction there is added a chain terminator. The heat of reaction is dissipated in said tank and aqueous sodium hydroxide and catalyst are added to complete the reaction. The process according to the invention leads to high yields of phosgene.
REFERENCES:
patent: 3945969 (1976-03-01), Horn et al.
patent: 4122112 (1978-10-01), Koda et al.
patent: 4737573 (1988-04-01), Silva et al.
patent: 4810813 (1989-03-01), Kosky et al.
patent: 4962140 (1990-10-01), Diamantoglou
patent: 5011967 (1991-04-01), Silva et al.
patent: 5047497 (1991-09-01), Tamura et al.
Herrig Wolfgang
Hucks Uwe
Kirsch Jurgen
Schomacker Reinhard
Weymans Gunther
Anderson Harold D.
Bayer Aktiengesellschaft
Gil Joseph C.
Preis Aron
LandOfFree
Process for the production of polycarbonate does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for the production of polycarbonate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production of polycarbonate will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1758570