Patent ID: 7846633

Claim:
A toner for developing an electrostatic image, the toner having a core-shell structure, wherein the toner comprises: a colorant; a crystalline polyester binder resin selected from the group consisting of poly-1,2-cyclopropenedimethylene isophthalate, polydecamethylene adipate, polydecamethylene azelate, polydecamethylene oxalate, polydecamethylene sebacate, polydecamethylene succinate, polyeicosamethylene malonate, polyethylene-p-(carbophenoxy) butyrate, polyethylene-p-(carbophenoxy) undecanoate, polyethylene-p-phenylene diacetate, polyethylene sebacate, polyethylene succinate, polyhexamethylene carbonate, polyhexamethylene-p-(carbophenoxy) undecanoate, polyhexamethylene oxalate, polyhexamethylene sebacate, polyhexamethylene suberate, polyhexamethylene succinate, poly-4,4-isopropylidenediphenylene adipate, poly-4,4-isopropylidenediphenylene malonate, trans-poly-4,4-isopropylidenediphenylene-1-methylcyclopropane dicarboxylate, polynonamethylene azelate, polynonamethylene terephthalate, polyoctamethylene dodecanedioate, polypentamethylene terephthalate, trans-poly-m-phenylenecyclopropane dicarboxylate, cis-poly-m-phenylenecyclopropane dicarboxylate, polytetramethylene carbonate, polytetramethylene-p-phenylene diacetate, polytetramethylene sebacate, polytrimethylene dodecanedioate, polytrimethylene octadecanedioate, polytrimethylene oxalate, polytrimethylene undecanedioate, poly-p-xylene adipate, poly-p-xylene azelate, poly-p-xylene sebacate, polydiethylene glycol terephthalate, cis-poly-1,4-(2-butene) sebacate, polycaprolactone and mixtures thereof; and a silica filler in the core of the toner in an amount from 10% to 40%, wherein the toner has a flow tester ½ effluent temperature of from 60 to 100° C., and a shell of the toner comprises a thermoplastic resin and a filler.