(CO) polycarbonate composition and process for preparing the sam

Details (CO) polycarbonate composition and process for preparing the sam (CO) polycarbonate composition and process for preparing the sam

1994-04-15

1995-12-12

Seidleck, James J.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528171, 528174, 528176, 528179, 528182, 528196, C08G 6400

Patent

active

054750792

ABSTRACT:
A (co)polycarbonate composition mainly comprising a (co)polycarbonate having a limiting viscosity number [.eta.] of 0.2 to 1.0 dl/g and terminal hydroxyl groups in an amount of 20 mole % or below, based on all the terminal groups of the (co)polycarbonate, and is substantially free from any branched structure which might otherwise be formed by a side reaction. The (co)polycarbonate contains chlorine (causasive of discoloration) in an amount of 10 ppm or below and an alkali metal ion and/or an alkaline earth metal ion in an amount of 1 ppm or below. A process for preparing the above (co)polycarbonate composition by the melt transesterification process involves the reaction of a dihydroxy compound such as bisphenol A and a carbonic diester such as diphenyl carbonate with a nitrogen-containing basic compound (a), and/or, a compound (b) containing an element selected from the group consisting of elements belonging to Groups I, II, IV and V of the periodic table as a catalyst.

REFERENCES:
patent: 4948871 (1990-08-01), Fukuoka et al.
patent: 5142018 (1992-08-01), Sakashita et al.

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