| abstract |
A two-component type developer for developing an electrostatic image is constituted by a toner and a carrier. The carrier is composed of a magnetic material and a resin either coating or dispersing the magnetic material. The resin comprises a copolymer having structural units of the following formula [1 ] and [2]:n wherein A denotes a C 1 - C 10 linear, branched or cyclic alkylidene group, aryl-substituted alkylidene group or arylenedialkylidene group, -O-, -S-, -CO-, -SO- or -S0 2 -; and R 1 - R 4 independently denote hydrogen, halogen, or a C 1 - C 4 alkyl or alkenyl group;n wherein R 5 denotes a C 2 - C 6 alkylene or alkylidene group; R 6 and R 7 denote a C 1 - C 3 alkyl group, a phenyl group or a substituted phenyl group; and n is an integer of 1 - 200. |