Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in reactor of specified material – or in reactor...
Patent
1992-03-16
1995-07-18
Seidleck, James J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymerizing in reactor of specified material, or in reactor...
525468, 528196, 528198, 528200, C08F 200, C08G 6400
Patent
active
054342279
ABSTRACT:
A polycarbonate is produced by transesterification from a dihydroxy compound such as 2,2-bis(4-hydroxyphenyl)propane and a diester of carbonic acid such as bisphenyl carbonate in the presence of a substance containing iron in an amount of 50% by weight or less to contact the reactants. Also, a polycarbonate is produced by transesterification from a dihydroxy compound and a diester of carbonic acid in a reactor made of stainless steel and treated by electropolishing or acid pickling or buffed on a surface part thereof to contact the reactants. As the transesterification catalyst, (a) a nitrogen-containing, electron-donating compound and (b) a nitrogen-containing, electron-donating compound and an alkali metal compound or an alkaline earth metal compound are preferably used.
REFERENCES:
patent: 4267303 (1981-05-01), Konig et al.
patent: 4383092 (1983-05-01), Ko et al.
Chemical Abstracts, vol. 116, No. 20, May 18, 1992, Yamoto et al, 195134r, Manufacture of Polycarbonates with High Molecular Weight and Low Coloration.
Fukuda Yutaka
Kanno Tatsuya
Kuwana Takaaki
Okano Yoshimichi
Oshino Yasuhiro
Daicel Chemical Industries Ltd.
Mosley T.
Seidleck James J.
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