Preparation of branched polycarbonate composition from cyclic ar

Details Preparation of branched polycarbonate composition from cyclic ar Preparation of branched polycarbonate composition from cyclic ar

1991-07-26

1993-03-02

Anderson, Harold D.

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

Synthetic resins

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

525461, 528371, C08L 6900

Patent

active

051910381

ABSTRACT:
Branched polycarbonates are prepared by melt equilibration of aromatic cyclic polycarbonate oligomes with a polyhydric phenol having more than two hydroxy groups per molecule, preferably 1,1,1-tris-(4-hydroxyphenyl)ethane, in the presence of a carbonate equilibration catalyst, preferably tetrabutylammonium tetraphenylborate. In an additional embodiment of the invention, a linear aromatic polycarbonate is added to the reaction mixture. Branched polycarbonates prepared according to this invention have high melt strength and high shear sensitivity characteristics and are useful in extrusion and injection molding processing applications and particularly useful in blow molding applications for preparing relatively large articles and panels.

REFERENCES:
patent: 5097008 (1992-03-01), Krabbenhoft et al.

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