General Electric Company

Vijaykumar Hanagandi

Patrick Joseph McCloskey

Ye-Gang Lin

Eric Thomas Gohr

Devesh Mathur

Rafael Hierro Martin

Ana Isabel Diaz Calderon

Michael F Shannon

Chad David Mistele

A method and apparatus for measuring the rheological properties of a polymer melt includes flowing the polymer melt from a first reactor to a device through a conduit at a predetermined flow rate, measuring a first pressure of the polymer melt at a first location in the conduit, measuring a second pressure at a second location downstream from the first location, measuring a temperature at a third location in the conduit, wherein the third location is between the first location and the second location, and calculating the rheological property of the polymer melt as it flows through the conduit. The method and apparatus do not require diversion of the polymer melt from the main process stream.

Rheological measurement process

The application relates to methods for producing a polycarbonate resin having a narrowed molecular weight distribution, specifically, the application relates to the use of a redistribution catalyst and a feedback loop control mechanism to prepare narrow molecular weight distribution resin.

Redistributed polycarbonate resin

Growing community of inventors

Evansville, IN, United States of America

Vijaykumar Hanagandi