Process for producing aromatic polycarbonate

Details Process for producing aromatic polycarbonate Process for producing aromatic polycarbonate

1995-09-12

1996-11-26

McKane, Joseph

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

558268, C08G 6404, C07C 6806

Patent

active

055786944

ABSTRACT:
A process for producing an aromatic polycarbonate is described, which comprises melt-polycondensing an aromatic diol compound with a diaryl carbonate compound in the presence of an interesterification catalyst, said interesterification catalyst comprising a quaternary phosphonium salt compound represented by formula (II): ##STR1## wherein R.sup.3, R.sup.4, R.sup.5, and R.sup.6 each independently represent an alkyl group having 1 to 12 carbon atoms, an aryl group, an aralkyl group, or a cycloalkyl group, and X.sup.l- is an anion selected from the group consisting of a carbonate ion, a phosphate ion, and a tetrahydroxyboron ion, with the letter l indicating the valency of X.

REFERENCES:
patent: 3442854 (1969-05-01), Curtius et al.
patent: 4345062 (1982-08-01), Brunelle
patent: 5340905 (1994-08-01), Kuhling et al.
patent: 5527875 (1996-06-01), Yokoyama et al.

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