General Electric Company

Pin-pin Wu

Patrick Joseph McCloskey

David Michel Dardaris

Ye-Gang Lin

Roy Ray Odle

Jimmy Lynn Webb

Farid Fouad Khouri

Theodorus L Hoeks

Eric Thomas Gohr

Raphael Mestanza

William James Swatos

Adrianus Alphonsus Kusters

YeGang Lin

Linear polyesters are branched by transesterification with resins having the formula: ##STR1## wherein n is an integer of from 1 to 10.

Process for branching thermoplastic linear polycarbonate resins

The disclosure describes reacting a multi-functional phenolic or carboxylic branching agent with a transesterification catalyst to form an organic salt prior to reactive extrusion of said organic salt branching agent with linear polycarbonate resin as a means to dramatically increase the efficiency of the branching agent in the preparation of branched polycarbonate.

Method of branching and cross-linking a polycarbonate resin

Branched polycarbonates having properties suitable for blow molding are prepared by equilibrating a linear or branched aromatic polycarbonate with certain tetraphenols, especially 2,2,5,5-tetrakis (4-hydroxyphenyl)hexane and �1,1-bis(p-hydroxyphenyl)ethyl!-phenyl ether.

Tetraphenols and their use as polycarbonate branching agents

Polycarbonate resins are freed of unreacted residues of the dihydric phenol reactants employed in their preparation by heating the resins in the presence of ortho esters or ortho carbonates.

Ortho esters as BPA scavenger in polycarbonate product

The efficiency of a redistribution catalyst during polycarbonate redistribution is improved by employing an extruder screw design that provides a melt seal between the extruder throat and the vacuum port. A melt seal exists when the free volume within the extruder is sufficiently filled with molten resin so as to prevent the passage of gases between sections of the extruder.

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Evansville, IN, United States of America

Pin-pin Wu