PURPOSE: To obtain a superior colorant for a wet or dry developer by mixing a specified resin and a vinyl chloride polymer having a specified polymn. degree with a specified percentage of a plasticizer basing on the total amount of the resins, a stabilizer, and a pigment or a dye added to a specific percentage of wax.
CONSTITUTION: A mixture consisting of a resin A selected from styrene resin, polyalkyl methacrylate and polycarbonate and of a vinyl chloride (co)polymer having 500W2,000 polym. degree (resin B) in 30:70W90:10 weight ratio is kneaded with 10W100wt% plasticizer basing on the amount of the mixture, 5W20wt% stabilizer such as lead chloride basing on the amount of the resin B, and a pigment or a dye added to 1W5wt% wax basing on the amount of the colorant, and the kneaded material is pulverized to obtain a colorant for an electrophotographic developer. By dispersing this colorant and a resin for a toner in a hydrocarbon solvent, a wet developer is obtd., or the colorant is kneaded with a resin for a toner and pulverized to obtain a dry toner. The resulting toner has superior transferrability and fixability.
HASHIMOTO JIYUNICHIROU
UMEDA MINORU
