Loading patent…
AssigneeAgfa-Gevaert
InventorsJan Frans Van Besauw, Noel Jozef De Volder, Jozef Leonard Van Engeland, Albert Lucien Poot
Estimating the term…
A developing material for use in the development of electrostatic images comprising toner particles and carrier particles is described wherein the developing material incorporates at least one solid hydrophobic bivalent or trivalent metal salt of a half-ester of a branched-chain or straight-chain aliphatic dicarboxylic acid and/or at least one bivalent or trivalent metal salt of a monoester or diester of a phosphorus oxyacid. The images obtained by means of this developing material have an improved image contrast, solid area coverage and surface smoothness. The toner particles show less tendency to cake and agglomerate and have improved mechanical strength. Cleaning of the imaging surface between use and re-use is also facilitated.
A dry developing material for dry development of electrostatic images comprising a mixture of carrier particles and finely divided toner powder, said mixture having incorporated therein at least one solid hydrophobic bivalent or trivalent metal salt of a monoester or diester of a phosphorus oxyacid in a sufficient amount to improve the dry free-flowing nature thereof.
A process of dry electrophotographic development comprising the steps of bringing an imaging surface carrying an imagewise pattern of electrostatic charges thereon into contact with a developing material which comprises a dry mixture of finely divided toner powder and carrier particles which has incorporated therein at least one solid hydrophobic bivalent or trivalent metal salt of a monoester or diester of a phosphorus oxyacid in a sufficient amount to improve the dry free-flowing nature thereof, at least a portion of said toner powder being attracted to said imaging surface to form a visible image of said charge pattern.
A dry toner material for use in the dry development of electrostatic images comprising finely divided toner powder having incorporated therein at least one solid hydrophobic bivalent or trivalent metal salt of a monoester or diester of a phosphorus oxyacid in sufficient amount to improve the dry free-flowing nature of said powder.
Dependencies are inferred from the claim text.