Patent ID: 6274282
Filing Date: 2001-08-14
Classification: G03G

Abstract:
An image formation method for forming a color image comprising the step of superimposing, on a transfer sheet, four yellow, magenta, cyan and black toner images which are respectively obtained by developing four latent electrostatic images, which respectively correspond to said four yellow, magenta, cyan and black toner images, with said yellow toner, said magenta toner, said cyan toner and said black toner, wherein a gradient a.sub.Y of a yellow glossiness per unit amount of said yellow toner (mg/cm.sup.2) deposited on said transfer sheet, a gradient a.sub.M of a magenta glossiness per unit amount of said magenta toner (mg/cm.sup.2) deposited on said transfer sheet, and a gradient a.sub.C of a cyan glossiness per unit amount of said cyan toner (mg/cm.sup.2) deposited on said transfer sheet are in a range of 0.8 a to 1.2 a, and a gradient a.sub.BK of a black glossiness per unit amount of said black toner (mg/cm.sup.2) deposited on said transfer sheet is in a range of 0.4 a to 0.7 a, in which a=(a.sub.Y +a.sub.M +a.sub.C)/3, wherein each of said color toners comprises a coloring agent and a binder resin;wherein said black toner comprises a glossiness controlling agent in the form of finely divided particles with a particle diameter of 0.1 to 0.8 .mu.m;and wherein said glossiness controlling agent is present in an amount of 0.2 to 15 wt. % of the total weight of said black toner.