Dximaging

Xerox Corporation

E.i. Dupont De Nemours and Company

William A Houle

James R Larson

Gregg A Lane

Kathryn A Pearlstine

Torence J Trout

Loretta Ann Page

Thomas Peter Tufano

Loretta Ann Grezzo Page

Steven P Schmidt

David E Blair

Carolyn C Legere-Krongauz

Daniel McClain

System for replenishing liquid developer in equipment, such as a printer, whereby the percent of toner solids is maintained at about 0.5 to 4% by weight based on the total weight of liquid developer, the system comprising at least one liquid toner concentrate vessel containing aggregates of thermoplastic resin particles, median particle size (volume weighted) greater than 15 .mu.m, and with 90% of the particles (volume weighted) not less than 30 .mu.m, composed of 50 to 100% by weight of particles and 0 to 50% by weight carrier liquid; a liquid vessel containing carrier liquid, means communicating each of said vessels with a dispersing vessel containing high shearing or high impact means wherein contents of the liquid toner concentrate vessel and the liquid vessel are supplied thereto and the resin particles are dispersed in the carrier liquid to form particles having a median particle size (volume weighted) of less than 15 .mu.m, and with 90% of the particles (volume weighted) less than 30 .mu.m in an amount of about 0.5 to 20% by weight of resin particles and about 99.5 to 80% by weight carrier liquid said dispersion being supplied and metered into the supply vessel containing original liquid developer to maintain the desired weight of solids. The system is useful in copying, proofing, etc., equipment, and the liquid developer is useful for making copies, proofs, lithographic printing plates and resists.

System for replenishing liquid electrostatic developer

A liquid developer contains a liquid carrier, a halogenated charge director and toner particles. Preferably, the charge director contains a fluorinated portion and a hydrocarbon portion. The charge director provides a developer which is fully charged but has a very small residual conductivity, thus providing a high quality image.

Halogenated charge directors for liquid developers

A liquid developer is prepared from a liquid electrostatic developer concentrate comprising up to 80% toner solids and a surfactant. The liquid electrostatic developer concentrate may be prepared by preparing a liquid electrostatic developer containing up to 20% toner solids; subsequently adding a surfactant to the liquid electrostatic developer; and concentrating the liquid electrostatic developer. The surfactant permits the easy redispersion of the toner solids at the time of use.

Additives for liquid electrostatic developers

A liquid electrostatic developer includes a toner which is made from a halogenated resin, a thermoplastic resin and a colorant. Preferably the halogenated resin is a fluorinated resin. Optionally, a charge adjuvant may be present. The liquid electrostatic developer is prepared by a process wherein the halogenated resin, the thermoplastic resin, the optional colorant and the optional charge adjuvants are melt blended to form a mixture. This mixture is ground at a cold temperature, and subsequently charged with a charge director. The toner used in the liquid electrostatic developer formed by this process has excellent thermoplastic and electrical properties and provides a developer with excellent imaging characteristics.

Halogenated resins for liquid developers

Electrostatic liquid developer consisting essentially of

AB diblock copolymers as toner particle dispersants for electrostatic

A process for preparing an improved positive-working electrostatic liquid developer comprising

Process for preparing positive electrostatic liquid developers with

Process for the preparation of toner particles for electrostatic liquid developers, which upon fusing to paper have a gloss .gtoreq.10 units over the paper gloss comprising:

Process for preparing high gloss electrostatic liquid developers

Process for stabilizing the crystalline grain morphology of silver halide grain cores prepared in the presence of a dispersing medium and an aminoazapyridine compound at a pH of 2.5 to 9 and pCl of 0 to 3, at least 50% of the total projected area of the total grain population being noncubic silver halide grain cores and the halide content being at least 50 mole percent chloride, based on total moles of silver precipitated, the improvement wherein after 60% of aqueous silver salt solution based on the total moles of silver precipitated is introduced a second halide salt, e.g., bromide, is added thereby forming on the grain cores a shell of 0.5 to 20 mole % based on the total moles of silver precipitated. The emulsions are useful in X-ray, color separation, inverse transfer films, and 'dry-silver' applications, etc.

Process for the stabilization of high-chloride crystals with modified

A positive charged electrostatic liquid developer consisting essentially of

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Kimberton, PA, United States of America

William A Houle