Electrophotographic reproduction material and process employing polyimide photoconductors

Abstract

Abstract AN ELECTROPHOTOGRAPHIC REPRODUCTION ELEMENT WHEREIN THE PHOTOCONDUCTOR SURFACE HAS A SURFACE POTENTIAL OF 0.25 TO 10 KV./0.001 INCH THICKNESS AND A CONDENSATION PRODUCT OF DIAMINES AND AT LEAST ONE TETRACARBOXYLIC ACID MOIETY IN WHICH THE CONDENSATION PROUDCT HAS THE REPEATING UNIT -N<(-CO-)2>R<(-CO-)2>N-R1- OR A HOMOPOLYIMIDE OF REPEATING UNITS >N-BENZENETRIYL<(-CO-)2 WHERE R IS AN ORGANIC TETRAVALENT RADICAL CONTAINING AT LEAST TWO CARBON ATOMS, SAID TETRAVOLENT RADICAL BEING BONDED TO FOUR CARBONYL GROUPS, NO MORE THAN TWO CARBONYL GROUPS BEING BONDED TO ANY ONE CARBON ATOM OF SAID TETRAVALENT RADICAL, R1 IS AN ORGANIC DIVALENT RADICAL CONTAINING AT LEAST TWO CARBON ATOMS, SAID DIVALENT RADICAL BEING BONDED TO TWO NITROGEN ATOMS, THE SAID NITROGEN ATOMS BEING ATTACHED TO DIFFERENT CARBON ATOMS OF SAID DIVALENT RADICAL, AND EITHER R, R1 OR BOTH, CONTAIN AT LEAST ONE RING OF SIX CARBON ATOMS CHARACTERIZED BY BENZENOID UNSATURATION. THE POLYIMIDES SHOULD HAVE AN INHERENT VISCOSITY OF AT LEAST 0.1 MEASURED AS A 0.5% SOLUTION IN CONCENTRATED SULFURIC ACID AT 30*C. THIS POLYIMIDE OR COPOLYMER THEREOF CAN BE THE SOLE PHOTOCONDUCTIVE INSULATING MATERIAL USE IN AN ELECTROPHOTOGRAPHIC REPRODUCTION PROCESS.

Inventors

• 👤 Keith Allan Maas

Bibliographic Details