Patent ID: 8263302

Claim:
A carrier for electrophotographic developer, comprising: a core material; and a layer comprising a hinder resin, located overlying the core material, wherein the binder resin comprises: a segment (A) comprising one or more polymerizable vinyl monomers as a structural unit; and a segment (B) comprising at least one of partially cleaved polyhedral oligomeric silsesquioxane having the following formula (1) and a partially cleaved polyhedral oligomeric silsesquioxane having the following formula (2) as a structural unit: (RSiO 1.5 ) n (1) wherein n represents an integer not less than 4; and a substituent R represents a hydrogen atom, a halogen atom, an alkoxy group or an aryloxy group having 1 to 10 carbon atoms, a saturated hydrocarbon group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an aralkyl group having 6 to 20 carbon atoms, an aryl group having 7 to 20 carbon atoms, a hydroxyalkyl group having 1 to 20 carbon atoms, a silicon-containing group having 1 to 10 silicon atoms or their substituted groups; and (R 1 SiO 1.5 ) n (R 2 SiO 2 H) m (2) wherein n and m independently represent an integer not less than 2; and R 1 and R 2 independently represent a hydrogen atom, a halogen atom, an alkoxy group or an aryloxy group having 1 to 10 carbon atoms, a saturated hydrocarbon group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an aralkyl group having 6 to 20 carbon atoms, an aryl group having 7 to 20 carbon atoms, a hydroxyalkyl group having 1 to 20 carbon atoms, a silicon-containing group having 1 to 10 silicon atoms or their substituted groups.