Eastman-kodak Company

Martin A Berwick

Hal E Wright

Lawrence E Contois

Edgar E Riecke

Peter S Alexandrovich

Domenic Santilli

Glenn T Pearce

William A Light

William T Gruenbaum

George A Reynolds

Norman G Rule

William K Goebel

Donald A Upson

Paul D VanderValk

Charles J Fox

Drewfus Y Myers, Jr

Chandrasekha Sreekumar

An improved interlayer is provided for use in a photoconductor element between an electrically conductive layer and a charge generation layer of the type where a dye is aggregated in a matrix polymer. The interlayer is a mixture of at least one polyester and at least one polycarbonate. The interlayer provides excellent adhesion between the conductive layer and the charge generation layer and dampens any stress to which the photoconductive element is subjected. Minimal effect on photosensitivity is achieved by optimizing interlayer thickness.

Photoconductor elements with multiphase stress-dampening interlayers

The invention provides new crosslinked vinyl polymer particles, new coating compositions containing such particles, new liquid electrographic developers containing such particles, new electrographic elements containing one or more layers comprising such particles, and new electrographic records containing toner images and/or layers comprising such particles. The polymeric particles of the invention are characterized in that each particle has an average diameter less than one micrometer and comprises a crosslinked vinyl addition copolymer obtainable by aqueous emulsion polymerization of a mixture of monomers wherein:

Crosslinked vinyl polymer particles and electrographic elements and

Protonic acid-free photoconductive compositions and elements comprising a photoconductor and, as a sensitizer, a 4-tertiaryaminobenzo�b!pyrylium salt or a 4-tertiaryaminobenzo�b!thiopyrylium salt. The resulting compositions and elements exhibit low persistent conductivity.

Pyrylium- and thiopyrylium-sensitized low-persistence photoconductive

A multilayer photoconductive element containing a photoconductive insulating composition and a conducting layer, such element having in association with the photoconductive composition an amorphous, water-insoluble polyester selected from the group consisting of

Polyester binder component in multilayer photoconductive element

A multi-active photoconductive insulating element having at least two layers comprising a charge-generation layer and an organic photoconductor-containing charge-transport layer is disclosed. The charge-generation layer contains a continuous polymeric phase having dispersed therein a co-crystalline complex composed of (i) at least one polymer having an alkylidene diarylene group in a recurring unit and (ii) at least one pyrylium-type dye salt.

Multi-active photoconductive element having an aggregate charge

A multi-active photoconductive insulating element having at least two layers comprising an aggregate photoconductive layer in electrical contact with a photoconductor containing layer. The aggregate photoconductive layer comprises at least one compound having the structure: ##STR1## in which Ar represents a substituted or unsubstituted arylene group, wherein said substituent is an electron accepting or an electron withdrawing group;

Multi-active photoconductive elements

Polyester interlayer and binder component in multilayer photoconductive

An organic photoconductive insulating composition and electrophotographic elements containing the same are prepared using as a photoconductor a polyarylalkane compound having the formula ##STR1## wherein R.sup.1 and R.sup.2 represent hydrogen, alkyl, or aryl groups, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 represent aryl groups, and A.sup.1 and A.sup.2 represent phenyl groups.

Photoconductive compositions and elements

A multi-active photoconductive insulating element having at least two layers comprising an aggregate photoconductive layer in electrical contact with a photoconductor containing layer. The aggregate photoconductive layer comprises at least one compound having the structure: ##STR1## wherein A represents: ##STR2## in which R.sub.1, R.sub.2, R.sub.3, and R.sub.4, which may be the same or different, represent a substituted or unsubstituted alkyl group having from 1 to 18 carbon atoms or a substituted or unsubstituted aryl group; R.sub.5 and R.sub.6, which may be the same or different, represent an electron withdrawing group, phenyl or substituted phenyl; R.sub.7 and R.sub.8, which may be the same or different represent an electron withdrawing group or hydrogen except that when Ar is unsubstituted phenylene or unsubstituted anthrylene, R.sub.7 and R.sub.8 must be other than hydrogen; R.sub.11 is an electron withdrawing group; Ar represents a substituted or unsubstituted arylene group, wherein said substituent is an electron accepting or an electron withdrawing group.

Multilayer aggregate photoconductive elements

Novel polymeric compounds having utility in multiactive photoconductive insulating elements. Such elements have at least two layers comprising an aggregate photoconductive layer in electrical contact with a photoconductor-containing layer. The aggregate photoconductive layer comprises at least one novel polymeric compound having the structure: ##STR1## WHEREIN R.sub.1, and R.sub.3, which may be the same or different, represent a substituted or unsubstituted alkyl group having from 1 to 18 carbon atoms or a substituted or unsubstituted aryl group;

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Kendall, NY, United States of America

Martin A Berwick