Eastman-kodak Company

Stewart H Merrill

Domenic Santilli

Frederick A Stahly

George L Fletcher, Jr

Alec N Mutz

John M Noonan

Thomas A Jadwin

Mohammad A Sandhu

Susan E Hartman

John C Wilson

Peter S Alexandrovich

Lawrence P DeMejo

Hal E Wright

Carl Kotlarchik, Jr

Richard A DEMauriac

Ernest W Turnblom

Beth G Wright

Ravi Khanna

Edmond S Perry

A two-component, dry electrostatic developer composition containing toner particles and coated-carrier particles is disclosed. The toner contains a binder polymer and a phosphonium, arsonium or stibonium charge-control agent dispersed in the toner binder. The carrier is coated with a fluoropolymer. The resulting developer exhibits reduced toner throw-off and other disclosed advantages.

Two-component dry electrostatic developer composition containing onium

A method for developing an electrostatic latent image on a nonporous surface using a self-fixing liquid developer is described. The developer contains a volatile, electrically insulating carrier, and toner particles, dispersed in the carrier, containing a polymer binder which has a Tg within the range from about -10.degree. C. to 30.degree. C. Upon application of the developer to a latent image and evaporating the liquid carrier from the image, the toner particles fix to the surface without externally applied heat other than from ambient conditions.

Method for forming a self-fixed image on a nonporous surface at ambient

The present invention provides novel composite electrically photosensitive particles. Each of said particle comprises a colorant and a polymeric binder comprising repeating units containing one or more structures selected from the classes consisting of triarylamines; p-aminotetraarylmethanes; 4,4'-bis(p-amino)triarylmethanes; 1,1-bis(p-aminoaryl)isobutanes; 1,1-bis(p-aminoaryl)cyclohexanes; N-alkyl-N,N-diarylamines; N,N-dialkyl-N-arylamines and heterocyclic nitrogen compounds having about 4 to 10 carbon atoms.

Composite electrically photosensitive particles for electrophoretic

In a photothermographic element comprising (A) at least one photosensitive layer comprising a photosensitive component, such as photosensitive silver halide or a diazotype photosensitive material, (B) at least one layer comprising a processing agent for the photosensitive component and (C) a separation polymer between (A) and (B), increased preexposure storage stability is provided by a polysulfonamide as separation polymer (C). After imagewise exposure of the photothermographic element, an image can be developed by merely heating the element to moderately elevated temperatures.

Photothermographic material and process

A negatively charged liquid electrographic developer comprising an electrically insulating carrier liquid such as a paraffinic hydrocarbon fraction, having stably dispersed therein (a) a halogenated polymer, such as chlorinated polyethylene, and having dissolved therein (b) a copolymer of a quaternary ammonium salt monomer and a solubilizing monomer and (c) a copolymer of a polar monomer and a solubilizing monomer.

Method of using liquid electrographic developers containing polymeric

Photoconductive layers and elements and methods for their use are disclosed. The layers and elements include polycarbonate binders and overcoats having pendant polar groups.

Polycarbonate overcoats and binders for photoconductive layers and

Polyesterionomers having the structure ##STR1## wherein G.sup.1 represents a straight or branched chain alkylene having about 2 to 12 carbon atoms, or, substituted or unsubstituted cycloalkylene, cycloalkylenebis(oxyalkylene) or cycloalkylenedialkylene;

Polyesterionomers having utility in liquid electrographic developer

Liquid electrographic developers containing polymeric quaternary salts

Liquid developers for electrography are provided containing soluble polymeric dispersing agents that comprise a phosphonate moiety. The phosphonate moiety comprises a phosphonic acid group, a half-ester of a phosphonic acid group, or a salt of either of these groups.

Electrostatic process using liquid developer comprising polymeric

Polyesterionomers useful as a binder in liquid electrophotographic developers having the structure are disclosed. ##STR1##

Liquid developers for electrography comprise an electrically insulating carrier liquid containing (1) an addition polymer comprising a polar moiety and at least one additional moiety having predetermined solubility characteristics with respect to the carrier liquid, (2) a polymer comprising a phosphonate moiety, and (3) a halogenated polymer.

Liquid electrographic developer

Liquid electrographic developer comprising polymeric phosphonate

A polymer is disclosed having repeating units with the structures ##STR1## AND ##STR2## WHEREIN R.sup.1 and R.sup.2 are the same or different, and are each hydrogen, halogen or alkyl from 1 to about 3 carbon atoms,

Polysulfonamides

A light-sensitive vesicular imaging composition comprising a vesiculating agent which liberates gas upon exposure to activating radiation, and a binder which is a sulfonamide polymer having the sulfur-nitrogen linkage either in the polymer chain or as a pendant moiety. The composition is coated as a thin film. Imagewise irradiation of the element causes gas bubbles to be released in the exposed areas, which bubbles may be developed by overall heating to a visible record.

Polysulfonamide vesicular binders and processes of forming vesicular

The present invention relates to an electrographic developing composition containing finely divided carrier particles and finely divided toner particles having incorporated therein a fusible, crosslinked binder polymer. An improved electrographic developing process using such toner particles is also disclosed.

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Rochester, NY, United States of America

Stewart H Merrill