Amoco Corporation

Union Carbide Corporation

Ulrich A Steiner

Louis M Maresca

Alford G Farnham

Thomas H Schwab

Walter Thomas Reichle

James H Kawakami

Mitchell H Berger

Benito See

Wong F Ark

Described herein are novel crystalline polyarylnitrile polymers which have excellent mechanical and thermal properties. Also, described is a process for producing such polyarylnitrile polymers.

Crystalline polyarylnitrile ether 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

An improvement in processes for preparing diaryl sulfones comprising adding a limited amount of water to the reaction product mixture of such processes to form a heavier aqueous phase containing unreacted monosubstituted benzene sulfonic acid with less than an equal amount of water, separating the aqueous phase, and dehydrating the aqueous phase to recover the unreacted sulfonic acid for forming additional diaryl sulfone.

Processes for preparing diaryl sulfones

Polyarylnitrile polymers and a method for their production

Described herein is a process for preparing polyarylates which comprises reacting a diester derivative of a dihydric phenol with an aromatic dicarboxylic acid in the presence of from about 10 to about 60 weight percent of at least one particular halogenated and/or etherated substituted aromatic or heteroaromatic compound, at a temperature of from about 260.degree. to about 350.degree. C.

A process is provided for producing a mixture of aromatic sulfonyl chlorides and aromatic sulfones substantially free of the corresponding aromatic sulfonic acids and their anhydrides, which comprises the steps of (a) reacting a monosubstituted benzene such as monochlorobenzene with sulfur trioxide in the presence of at least about 15 mole percent to about 50 mole percent of thionyl chloride, based on the sulfur trioxide, at a temperature from about the freezing point of the reactants to about 40.degree. C.; (b) adding to the reaction mixture of step (a) at least about 60 mole percent thionyl chloride, based on the sulfur trioxide, and preferably a small catalytic amount of dimethylformamide, wherein the total thionyl chloride in the reaction mixture is at least about 110 mole percent, based on the sulfur trioxide, while maintaining the reaction mixture at a temperature between about 25.degree. C. and 70.degree. C.; and then (c) continuing the reaction up to a temperature of about 160.degree. C. The mixture produced can be used without further purification to form diaryl sulfones in high yield, for example, by reacting with monochlorobenzene in the presence of ferric chloride.

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North Plainfield, NJ, United States of America

Ulrich A Steiner