Union Carbide Corporation

Amoco Corporation

Other

Benito See

Louis M Maresca

James H Kawakami

Thomas R Jones

Markus Matzner

Rathin Datta

Charles B Mallon

Ulrich A Steiner

John I Sarlis

David M Trampe

John S Vames

Process for the production of polysaccharide ethers, e.g. cellulose ethers, are disclosed wherein salts formed during the process, e.g., sodium nitrate or sodium acetate, are converted to their corresponding acids and bases by means of an electric current, preferably in combination with a bipolar membrane and suitable catiion and/or anion membranes. The acids and bases recovered from the process can be recycled, thereby avoiding the need to provide for disposal of salts.

Method of preparing modified cellulose ether

Described herein is an improved process for preparing an ester derivative of a dihydric phenol by reacting the dihydric phenol with an acid anhydride wherein the improvement comprises carrying out the reaction in the presence of a particular adsorbent. Also described herein is a method of treating an ester derivative of a dihydric phenol with a particular adsorbent.

Process for preparing a color-improved thermoplastic polyarylate polymer

Described herein is a process for preparing a polyarylate having a reduced viscosity of from about 0.5 to greater than 1.0 dl/gm which process comprises the following steps:

Process for preparing polyarylates

Color improved polyarylates having a reduced viscosity of from about 0.1 to greater than 1.0 dl/gm produced by a process comprising the following steps:

Color improved polyarylate

An improved process for preparing a polyarylate having a reduced viscosity of from about 0.1 to greater than 1.0 dl/gm comprising the following steps:

Described herein is an improved process for preparing a polyarylate having a reduced viscosity of from about 0.5 to greater than 1.0 dl/gm which process comprises the following steps:

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Belle Mead, NJ, United States of America

Benito See