| 摘要 |
PURPOSE:To obtain a toner contg. a colorant with superior dispersibility, having an increased blackening degree and causing hardly fog during copying by dispersing carbon black in a monomer having a polymerizable unsatd. group in the presence of a specified sulfonate compound. CONSTITUTION:This toner contains a polymer binder, carbon black and a sulfonate compound represented by formula I (where each of R and R' is 6-50C straight chain or branched alkyl and M is an alkaline earth metal). The amount of the compound added is <=10wt%, preferably 0.5-4wt% of the amount of a polymerizable monomer used. The compound and carbon black as a colorant are dispersed in the polymerizable monomer, and the monomer is polymerized in an oily phase by a suspension polymn. method to produce polymer particles. Any polymerizable monomer such as styrene or p-chlorostyrene can be used as the polymerizable monomer. A mixture of such monomers may be used. |
