Abstract: The present invention relates to a developer comprising toner to which laminated titanium oxide is externally added.

Abstract: The present invention relates to a toner comprising a specific binder resin, a specific polyethylene wax and a specific polypropylene wax. The present invention further relates to a toner which comprises a binder resin including a specific first resin and a specific second resin.

Abstract: The present invention relates to a negatively chargeable toner comprising at least a binder resin, carbon black, and charge controller, wherein said charge controller is a colorless or white in color boron compound, and wherein a melt viscosity curve of said negatively chargeable toner has an inflection point of a viscosity slope, an inflection point temperature (T.sub.2) existing within a temperature range of T.sub.1 +20.degree. C. to T.sub.1 +40.degree. C. relative to a flow start temperature (T.sub.1), a first absolute value (.DELTA..eta..sub.1) existing within a range of 4.0.times.10.sup.-2 to 6.0.times.10.sup.-2, said first absolute value. (.DELTA..eta..sub.1) being a mean viscosity slope within a temperature range below the inflection point temperature (T.sub.2), a second absolute value (.DELTA..eta..sub.2) existing less than 2.0.times.10.sup.-2, said second absolute value (.DELTA..eta..sub.2) being a mean viscosity slope within a temperature range higher than said inflection point temperature (T.sub.

Abstract: The negatively chargeable toner of the present invention includes a boron compound expressed by the chemical structural formula (A): ##STR1## wherein R.sub.1 and R.sub.3 respectively represent substituted or non-substituted aryl group, R.sub.2 and R.sub.4 respectively represent hydrogen atom, alkyl group, substituted or non-substituted aryl group, X represents a cation, and n is an integer of either 1 or 2; to improve charge rise characteristics and charging stability.