Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1993-11-29
1995-06-20
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528196, 528371, C08G 6400
Patent
active
054261708
ABSTRACT:
1. A method for preparing an aromatic polycarbonate having less content of a low molecular weight oligomer which comprises the steps of:
(A) conducting an interfacial polymerization reaction in a reaction system comprising at least one aromatic dihydroxy compound, a carbonate precursor, an alkali metal or alkaline earth metal base, water and an organic solvent in the absence of an endcapping agent, and
(B) conducting an interfacial polymerization reaction with the addition of an endcapping agent after at least one of the following parameters reaches a predetermined value:
(1) a weight-average molecular weight of a prepolymer obtained in step A,
(2) a residual amount of the aromatic dihydroxy compound which is contained in the reaction mixture obtained in step A,
(3) an amount ratio of a bishaloformate compound to a prepolymer wherein the bishaloformate compound is a bishaloformate derivative of a dihydroxy compound and is contained in the reaction mixture obtained in step A.
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Hirao Motokazu
Ito Tomonori
Nakatsuka Masakatsu
Totani Yoshiyuki
Yamaguchi Akihiro
Kight III John
Mitsui Toatsu Chemicals Inc.
Mosley Terressa
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