Abstract: Hydrophobic silica particles are produced by reacting them with a hydrosiloxane agent.

Abstract: The invention provides a toner composition comprising resin particles, a colorant, and a toner additive, wherein the toner additive comprises carbon-silica dual phase particles, wherein the carbon-silica dual phase particles comprise aggregates of carbon black comprising at least one silicon-containing region, and wherein the carbon-silica dual phase particles are distributed on the surface of the resin particles. The invention also provides a method of preparing the aforesaid toner composition.

Abstract: The invention provides hydrophobic surface-treated silica particles having (1) a ratio T2:T3 of about 0.4 or more, wherein T2 is the intensity of a peak having a chemical shift in the CP/MAS 29Si NMR spectrum centered within the range of ?56 ppm to ?59 ppm, and wherein T3 is the intensity of a peak having a chemical shift in the CP/MAS 29Si NMR spectrum centered within the range of ?65 ppm to ?69 ppm, and (2) a ratio (T2+T3)/(T2+T3+M) of greater than about 0.05, wherein M is the intensity of a peak having a chemical shift in the CP/MAS 29Si NMR spectrum centered within the range of +7 ppm to +18 ppm. The invention also provides a method of preparing hydrophobic surface-treated silica particles.

Abstract: The invention provides a toner composition comprising toner particles and composite metal oxide particles comprising a core consisting of a first metal oxide and a coating consisting of a second metal oxide. The core is substantially spherical and non-aggregated. The invention also provides a method for the preparation of a toner composition.

Abstract: Hydrophobic silica particles are produced by reacting them with a hydrosiloxane agent.

Abstract: The invention provides surface-treated metal oxide particles. The surface-treated metal oxide particles have specific ratios of (1) the integrated area of the resonance signals with chemical shifts in the range from ?4 ppm to ?33 ppm to the integrated area of the resonance signals with chemical shifts in the range from ?33 ppm to ?76 ppm and (2) the integrated area of the resonance signals with chemical shifts in the range from ?76 ppm to ?130 ppm to the integrated area of the resonance signals with chemical shifts in the range from ?33 ppm to ?76 ppm in the CP/MAS 29Si NMR spectrum. The invention further provides a toner composition for electrophotographic image formation comprising toner particles and surface-treated metal oxide particles.

Abstract: Treated metal oxide particles include metal oxide particles treated with at least a charge modifying agent. The charge modifying agent is represented by the following formula: An-Zc-Yb—Ar(EW)a wherein Ar represents an aromatic group, EW represents an electron withdrawing group, Y represents a spacer group, Z represents an alkylene group, An represents an anchor group, a is an integer from 1 to 5, b is 0 or 1, and c is 0 or 1. The treated metal oxide particles may also be treated with a second charge modifying agent or with a hydrophobicity-imparting agent. A toner composition including toner particles and treated metal oxide particles is also disclosed.

Abstract: The invention provides surface-treated metal oxide particles. The surface-treated metal oxide particles have specific ratios of (1) the integrated area of the resonance signals with chemical shifts in the range from ?4 ppm to ?33 ppm to the integrated area of the resonance signals with chemical shifts in the range from ?33 ppm to ?76 ppm and (2) the integrated area of the resonance signals with chemical shifts in the range from ?76 ppm to ?130 ppm to the integrated area of the resonance signals with chemical shifts in the range from ?33 ppm to ?76 ppm in the CP/MAS29Si NMR spectrum. The invention further provides a toner composition for electrophotographic image formation comprising toner particles and surface-treated metal oxide particles.

Abstract: This invention provides metal oxide particles surface-treated with a cyclic silazane and a hydrophobicity-imparting agent, methods of making such, and toner compositions comprising the same.

Abstract: The invention provides hydrophobic surface-treated silica particles having (1) a ratio T2:T3 of about 0.4 or more, wherein T2 is the intensity of a peak having a chemical shift in the CP/MAS 29Si NMR spectrum centered within the range of ?56 ppm to ?59 ppm, and wherein T3 is the intensity of a peak having a chemical shift in the CP/MAS 29Si NMR spectrum centered within the range of ?65 ppm to ?69 ppm, and (2) a ratio (T2+T3)/(T2+T3+M) of greater than about 0.05, wherein M is the intensity of a peak having a chemical shift in the CP/MAS 29Si NMR spectrum centered within the range of +7 ppm to +18 ppm. The invention also provides a method of preparing hydrophobic surface-treated silica particles.

Abstract: This invention provides metal oxide particles surface-treated with a hydrophobicity-imparting agent, methods of making such, and toner compositions comprising the same.

Abstract: The invention provides metal oxide particles surface-treated with at least one alkoxysilane compound, methods of making such, and toners comprising same.

Abstract: The invention provides a toner composition comprising toner particles and composite metal oxide particles comprising a core consisting of a first metal oxide and a coating consisting of a second metal oxide. The core is substantially spherical and non-aggregated. The invention also provides a method for the preparation of a toner composition.