Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1988-08-11
1989-12-26
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528199, C08G 6338
Patent
active
048899119
ABSTRACT:
Thermotropic, fully aromatic polyesters and polyester carbonates are produced by esterification of optionally substituted p-hydroxybenzoic acids and aromatic dicarboxylic acids with diaryl carbonate at temperatures in the range from 100.degree. to 220.degree. C. and subsequent transesterification of the aryl ester obtained with diphenols and, optinally, more diaryl carbonate, accompanied by polycondensation, at temperatures in the range from 250.degree. to 330.degree. C., the esterification, the transesterification and the polycondensation being carried out in the presence of heterocyclic compounds containing 1 to 3 nitrogen atoms.
REFERENCES:
patent: 4297455 (1981-10-01), Lindner et al.
Ebert Wolfgang
Meyer Rolf-Volker
Ostlinning Edgar
Pielartzik Harald
Traenckner Hans-Joachim
Anderson Harold D.
Bayer Aktiengesellschaft
Mosley T.
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