To obtain the subject compound excellent in charge-controlling and increasing characteristics, heat resistance, light resistance, dispersibility in resins, charge characteristic-retaining stability, etc., and useful for toners for electrostatic charge development, etc.
Three molecules of a compound of formula I {R1 to R10 are H, a halogen, nitro, a 1-10C (halogenated) alkyl, a (substituted) aryl, a (nucleus- substituted) aralkyl, a group of the formula: -SO2N(R11)2 [R11 is H, a lower alkyl, a (nucleus-substituted) aryl, a (nucleus-substituted) aralkyl], a group of the formula: -N(R12)2 (R12 is R11, an acyl), a group of the formula:-CONH(R13) (R13 is R11); two or more of R1 to R10 may be combined with each other to form an aromatic ring or an alicyclic ring} or a compound of formula II (R21 to R28 are each a group of R1 to R10) are coordinated with two metal atoms to form a compound of the formula: D3(Met)2 (D3 is the compound of formula I or II; Met is a metal atom such as Cr, Fe, Al, Co or Ni).
SUGAWARA SHUJI
YAMANAKA SHUNICHIRO
TSURUHARA TORU
YASUMATSU MASASHI
