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

1993-05-04

1994-09-06

Foelak, Morton

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

Synthetic resins

From silicon reactant having at least one...

528 21, 528 25, 528 33, 528 36, 525464, C08G 7704

Patent

active

053449088

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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