Amoco Corporation

Standard Oil Company (Indiana)

Agnes M Palka

David A Wargowski

Marvin J Burgess

John K Allen

Edward A Lambers

A low modulus, solvent resistant, wet etchable polyimide useful in electronic applications as passivation and insulating coatings, said polyimides containing a 4,4'-bis(p-aminophenoxy)biphenyl moiety, a siloxane diamine moiety, and a dianhydride moiety.

Polyimide copolymers containing 4,4'-bis(p-aminophenoxy)biphenyl and

A low modulus, solvent resistant, wet etchable polyimide useful electronic applications as passivation and insulating coatings, said polyimides containing a 4,4'-bis(p-aminophenoxy)biphenyl moiety, a siloxane diamine moiety, and a dianhydride moiety.

Short, less than one second, residence time non-catalytic hydropyrolysis is conducted by rapid heating at more than 600.degree. C. per second of a solid mixture of aldehydo-, carboxy-, keto- and carboxy-, and aldehydo- and carboxy- substituted benzene and toluene and such solid also containing cobalt and/or manganese salts of organic acids and organic and/or inorganic bromides obtained from the manufacture of benzene di- and tricarboxylic acids up to a temperature of at least 700.degree. C. Such short residence hydropyrolysis produces attractive amounts of readily recoverable benzene and toluene as well as lower alkanes and alkenes and a solid carbonaceous char which can be burned to provide heat for the hydropyrolysis. The short residence hydropyrolysis is not subject to short activity and frequent periods of off-stream time as are the catalytic pyrolysis conducted at lower temperatures of from 300.degree. up to 500.degree. C.

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St. Charles, IL, United States of America

Agnes M Palka