Process for the manufacture of polycarbonate-oligomers without s

Details Process for the manufacture of polycarbonate-oligomers without s Process for the manufacture of polycarbonate-oligomers without s

1994-07-21

1995-10-24

Seidleck, James J.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

528196, 525464, C08G 6400

Patent

active

054611210

ABSTRACT:
Polycarbonate oligomers having hydroxy end groups are produced by a melt reaction with bisphenol-A and a basic catalyst. The oligomers may then be reacted with chloro end-group siloxanes in the presence of a solvent and an acid acceptor to yield polycarbonate-polysiloxane block co-polymers. The melt reaction occurs at elevated temperature without the direct use of phosgene gas.

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