| 摘要 |
PURPOSE:To decrease dependency of a toner/carrier ratio on a change in total amt. of a developer, etc. and to improve environmental stability and continuous use characteristics by incorporating a pigment formed by laking a specific diphenyl methane dye into a binder resin. CONSTITUTION:A pigment made by laking the diphenyl methane dye expressed by the formula (R1, R3 are respectively H, phenyl, hydroxyl group, etc., R2, R4 are respectively H, lower alkyl, etc., X1, X2 are respectively H, halogen lower alkyl, etc., A<-> is anion) is incorporated into a binder resin. The toner incorporated with such pigment has high friction electrification and good durability to repeated continuous copying. A developing method consisting in disposing an electrostatic image holding body 1 and a toner carrier body 2 at a specified space in a developing part, depositing a toner 5 having <=10emu/g satd. magnetization in about 5,000 Oe external magnetic field on the body 2 to the thickness smaller than the above-mentioned space and transferring the toner to the body 1 is used, by which the image having the image quality remaining stable even in the environment of high temp. and high humidity or low temp. and low humidity is obtd. over a long period of time. |
