The Dow Chemical Company

Clark J Cummings

Sarat Munjal

Eugene R Moore

George J Quarderer, Jr

Che-I Kao

Danil Tirtowidjojo

Dan Tirtowidjojo

Brian R Maurer

Paul E Hathaway

Bernard J Meister

Karen Mueller

The present invention is directed to a process for producing a high molecular weight condensation polymer by removing unwanted by-product(s) from a polycondensation equilibrium reaction mixture using a centrifugal force device equipped with a vacuum.

Process for producing a high molecular weight condensation polymer

A method for devolatilization of a thermoplastic polymer containing at least one volatile component which includes the following three steps: heating the thermoplastic polymer so that the thermoplastic polymer is a heated liquid or molten thermoplastic polymer, flowing the heated liquid thermoplastic polymer through a packed bed liquid-gas contactor by centrifugal force, and flowing a stripping gas through the packed bed countercurrent to the flow of the heated liquid thermoplastic polymer so that the volatile component volatilizes into the stripping gas from the heated liquid thermoplastic polymer by gas-liquid contacting in the packed bed; and an apparatus therefor.

Centrifugal method and apparatus for devolatilizing polymers

A process for producing a monovinylidene aromatic polymer having molecular weight (Mw) greater than 275,000 which comprises polymerizing a monomer mixture comprising a monovinylidene aromatic monomer in the presence of:

Process for producing high molecular weight monovinylidene aromatic

An improved polymer devolatilization apparatus including a flat plate heater having a multiplicity of flat plates defining a plurality of channels, each channel having a substantially uniform height but varying width over its length, each channel including three zones:

Polymer devolatilizer

A process for preparing halogenated polycarbonate wherein the total amount of base the end pH of the aqueous phaser and the amount of coupling catalyst employed in the reaction are controlled to selected levels.

Process for the preparation of high molecular weight halogenated

A process for preparing halogenated polycarbonate wherein the total amount of base, the end pH of the aqueous phase, and the amount of coupling catalyst employed in the reaction are controlled to selected levels.

A process for preparing glutarimide resins by the amidization and cycloimidization of methacrylate resins in the presence of a solvent characterized in that the solvent consists essentially of cyclohexanol.

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Midland, MI, United States of America

Clark J Cummings