| 摘要 |
The present invention provides a positive-charge control agent containing, as an active substance(s), one or two or more rhodanine compounds represented by the following formula (1). wherein R1 represents a hydrogen atom, etc.; R2 represents a hydrogen atom, etc.; and R3 to R7, which may be identical to or different from each other, represent a hydrogen atom, a cyano group, a trifluoromethyl group, a nitro group, etc. R2 to R7 may be joined to each other to form a ring. V, W, X, Y and Z represent a carbon atom or a nitrogen atom and 0 to 3 of V, W, X, Y and Z are nitrogen atoms, with the proviso that at least one of R3 to R7 is a linear or branched alkyl group having 1 to 4 carbon atoms substituted with three or more fluorine atoms etc.
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