Abstract: New polyesters are provided, having advantageous utility as dual function binder/charge agents in electrostatographic toner particles. The new polyesters contain a quaternary phosphonium salt comprising a cationic portion and an anionic portion, wherein the cationic portion comprises a phosphonium atom directly covalently bonded to at least one aryl moiety substituted with a group containing an ester linkage to the rest of the polyester, and wherein the anionic portion of the salt comprises an arylsulfonate moiety in which the aryl group is unsubstituted or is substituted with one or more alkyl, halide, or group having an ester linkage to the rest of the polyester.

Abstract: New electrostatographic toners and developers are provided, containing dual function polyester binder/charge agents. The new toner particle has an average diameter in the range of 0.01 to 100 micrometers and comprises a binder polyester and a charge-control agent comprising a quaternary phosphonium salt, wherein the phosphonium salt has a cationic portion comprising a phosphorus atom covalently bonded to at least one moiety containing an ester linkage to the binder polyester.

Abstract: An electrographic, two-component dry developer composition comprising charged toner particles and oppositely charged, magnetic carrier particles, which (a) comprise a magnetic material exhibiting "hard" magnetic properties, as characterized by a coercivity of at least 300 gauss and (b) exhibit an induced magnetic moment of at least 20 EMU/gm when in an applied field of 1000 gauss, is disclosed.The developer is employed in combination with a magnetic applicator comprising a rotatable magnetic core and an outer, nonmagnetizable shell to develop electrostatic images.

Abstract: The hollow character defect in electrostatically transferred dry toner images is reduced by an electrostatic dry toner composition comprising a binder polymer and a low surface energy liquid such as a silicone oil.

Abstract: 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.

Abstract: Alkyldimethylbenzylammonium salts are employed as charge control agents for fusible dry electrophotographic toners.

Abstract: The present invention relates to the use of low levels of quaternary ammonium salt surfactants as charge control agents for an electrostatic toner contained in dry electrographic developer compositions. Particularly useful such charge control agents are those which contain at least one amido group having 10 or more carbon atoms attached to the ammonium cation and an anion selected from a halide ion or an organosulfur-containing anion.

Abstract: The present invention relates to the use of low levels of certain alkoxylated amines as charge control agents for an electrostatic toner contained in dry electrographic developer compositions.

Abstract: 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.

Abstract: 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.