Nashua Corporation

Wilfred E Vail

Jan Bartus

A carrier composition is provided for electrophotographic development. Core particles are coated with a graft copolymer of a fluoropolymer and methyl methacrylate. The core particles preferably are a material selected from steel, nickel, iron, ferrites, passivated iron, or mixtures or alloys thereof. The fluoropolymer preferably is a polymer selected from chlorotrifluoroethylene, polyvinylidene fluoride, polytrifluoroethylene, polytetrafluoroethylene, copolymers of vinylidene fluoride and hexafluoropropylene, and copolymers of vinylidene fluoride and tetrafluoroethylene. In a preferred carrier composition, the coating consists of two layers. The exterior layer is a graft copolymer made of a fluoropolymer and methyl methacrylate.

Electrophotographic carrier comprising a coating of a grafted

Improved carrier materials for use in electrophotographic processes and processes for producing such carrier materials are disclosed. The carrier materials feature a preferably conductive core coated with an first conductive layer and a second, insulative layer. The coating layers preferably comprise a fluoropolymer matrix or other triboelectrically chargeable substance or substances. In one embodiment the same fluoropolymer is used in the first and second coatings.

Carrier materials

An improved carrier particle for use with a toner in electrostatic copying is described. The particle comprises an electroconductive core and a coating. In one embodiment the coating is made by combining a fluorocarbon resin with a charge control agent that has the same polarity as the toner. The carrier imparts a strongly positive triboelectric charge to the toner while resisting adhesion of toner particles.

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Litchfield, NH, United States of America

Wilfred E Vail