Patent ID: 6136489
Filing Date: 2000-10-24
Classification: G03G

Abstract:
A carrier for the development of an electrostatic image comprising a magnetic metal or oxide thereof incorporated therein as a core material, said core material being coated with a resin, wherein the following relationships (1) and (2) are satisfied:0.5.times.10.sup.-2 .ltoreq.Wc/Wo.ltoreq.1.6.times.10.sup.-2( 1)1.0.times.10.sup.-2 .ltoreq.C.multidot.Wc/(Wo+Wc).ltoreq.4.3.times.10.sup.-2( 2)wherein Wc is the weight (g) of the resin coated on the carrier core material; Wo is the weight (g) of the carrier core material; and C is the carbon concentration (mg/g) in the carrier;wherein said carrier exhibits a specific volume resistivity of not more than 5.0.times.10.sup.9 .OMEGA..multidot.cm at an applied voltage of 100 V; and whereinsaid carrier further comprises carbon black.