Patent ID: 6399264
Filing Date: 2002-06-04
Classification: G03G

Abstract:
A mono-component electrostatic developer comprising a mixture of (1) toner components containing magnetic image-forming particles, (2) positively charged particles, (3) negatively charged particles, and (4) a lubricant, wherein the lubricant comprises metal fatty acid salt particles selected from the group consisting of metallic salts of fatty acids with the chemical structure:M{OOCâ€”(CH2)nâ€”CH3}m where n=5-100, m=1-5 and M denotes mono or multivalent cation(s), wherein the lubricant is present in accumulated toner contamination-reducing effective amounts, and which electrostatic developer produces an R value of0.7&lE;R&lE;2.5 wherein R is the absolute value of (Q/M after making 10 black prints/Q/M after making 10 white prints) and wherein Q is the triboelectric charge of said toner components and M is a mass of said toner components as measured on a development sleeve.