Methane → Divinylbenzene-styrene

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The positively charged black color particles for display media were produced as follows. 3 parts by weight of nigrosine compound (Bontoron N07: product of Orient Chemical Industries, Ltd.) as a positive charge control agent, and, 5 parts by weight of carbon black (SPECIAL BLACK 5: production of Degussa) as black pigment were dispersed by a sand mill in 94 parts by weight of styrene monomer (KANTO CHEMICAL CO., INC.) and 6 parts by weight of divinylbenzen (KANTO CHEMICAL CO., INC.), and then 2 parts by weight of lauryl peroxide (PEROYL L: product of NOF CORPORATION) was further dissolved therein so as to obtain a liquid. The thus obtained liquid was suspended and polymerized in a purified water in which 0.5% of polyoxyethylene ether sodium sulfate (LATEMURU E-118B: product of KAO CORPORATION) as a surface active agent was added, and then the thus polymerized liquid was subjected to a filtering and drying process. Then, the particles 1 having a particle diameter range of 0.1-50 μm and an average particle diameter of 10 μm were obtained by classifying the dried member by means of classifier (MDS-2: NIPPON PNEUMATIC MFG. CO., LTD.). A glass transition temperature Tg measured by DSC measurement method was 75° C.

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