A developer for developing electrostatic latent images, comprising a mixture of toner and fine powder of silicic acid wherein the mixture has a ratio of B/A of 0.9 or larger provided that the mixture contains A wt. % thereof of the silicic acid fine powder, and contains B wt. % thereof of the silicic...http://www.google.es/patents/US5202213?utm_source=gb-gplus-sharePatente US5202213 - Developer with surface treated silicic acid for developing electrostatic image
Developer with surface treated silicic acid for developing electrostatic image
