Eastman-kodak Company

Dennis E DeMeyer

Dinesh Tyagi

James Hunter Anderson

Kevin D Lofftus

David E Hockey

Paul L Nielsen

In an electrostatographic process and apparatus a replenishment device adds toner particles to a development station that includes a developer comprising a mixture of toner particles and carrier particles. A reference parameter that is used in control of aim point of toner concentration in the mixture is set to an initial value until about a midlife of the developer is reached. Once the midlife of the developer is reached there are provided programmed step adjustments in the reference value in accordance with further increases in life of the developer to thereby control replenishment of toner particles so that control of charge to mass of the toner particles in the mixture is provided to reduce a tendency of dusting by the toner particles of the mixture due to age of the developer.

Electrostatographic apparatus and method with programmable toner

A method of developing electrostatic images with a two component developer avoids the break-in period of developer by providing a fresh mixture of carrier and toner, which toner has a first particle size but replenishes the mixture in use with toner having a second particle size larger than the first particle size. This compensates for the tendency of electrostatic images to preferentially attract the larger particles in a toner mixture.

Method of developing electrostatic images

A method for converting .alpha.-phase poly(vinylidene fluoride) to .beta.-phase poly(vinylidene fluoride), for preparing electrostatographic carrier and, electrostatographic developer and carrier. In the method for preparing electrostatographic carrier, uncoated electrostatographic carrier particles are coated with .alpha.-phase poly(vinylidene fluoride) to provide .alpha.-phase poly(vinylidene fluoride) coated carrier particles. A measurable portion of the .alpha.-phase poly(vinylidene fluoride) is then converted to .beta.-phase poly(vinylidene fluoride) by subjecting the .alpha.-phase poly(vinylidene fluoride) to a series of viscoelastic collisions having a total energy of from about 5.times.10.sup.4 to about 5.times.10.sup.5 Joules/kilogram of poly(vinylidene fluoride).

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Rochester, NY, United States of America

Dennis E DeMeyer