Developer for electrostatic image

Claim 1

A developer for electrostatic images comprising a toner and a carrier, characterized in that said carrier is made of a magnetic powder having a composition represented by the following formula (I) and has surfaces coated with a resin composition comprising a silicone resin in the form of a combination of segments represented by the following general formula (II) and segments represented by the following general formula (II′) and at least one member selected from the group consisting of compounds represented by the following general formula (III), (IV) or (V): (M0) x (Fe₂O₃)y      (I) (wherein M stands for at least one metal selected from the group consisting of Li, Mg, Mn Fe(II), Co, Ni, Cu, Zn, Cd, Sr, and Ba; and the molar ratio of x to y is at most 1.0); wherein R, R′, R˝ and R‴ each stand for a hydrogen atom, a halogen atom, a hydroxyl group, a methoxy group, a lower alkyl group having 1 to 4 carbon atoms, or a phenyl group); (wherein m is 2 or 3, R₁ and R₂ are each an alkyl group having 1 to 3 carbon atoms, R₃ is an alkylene group having 1 to 8 carbon atoms, and R₄ is a glycidoxy group or an epoxycyclohexyl group); (wherein n is 2 or 3; R₅ and R₆ are each an alkyl group having 1 to 3 carbon atoms; R₇ is an alkylene group having 1 to 3 carbon atoms; R₈ and R₉ are each a hydrogen atom, a methyl group, an ethyl group, a phenyl group, an aminomethyl group, or an aminoethyl group); and (wherein R₁₀ is an alkyl group having 1 to 3 carbon atoms or a vinyl group; and R₁₁ is a substituent selected from among R₁₂COO-, R₁₂-NH-, R₁₂-O-, wherein R₁₂ and R₁₃ are each an alkyl group having 1 to 3 carbon atoms, and R₁₄ is an alkylene group having 1 to 3 carbon atoms).