Toner for electrostatic image development

A toner for electrostatic image development comprising:

• a lubricant,
• a binder resin, and
• a coloring agent,
• wherein said lubricant has a DSC determined endothermic peak at 50.degree.-130.degree. C., with the half value width of said endothermic peak being not more than 15.degree. C., and is selected from the group consisting of di-n-decyl ketone, di-n-dodecyl ketone, di-n-stearyl ketone, di-n-icosyl ketone, di-n-behenyl ketone, di-n-tetracosyl ketone, distearyl sebacate, dibehenyl sebacate, stearyl laurate, behenyl laurate, stearyl stearate, behenyl stearate, myricyl stearate, stearyl behenate, behenyl behenate, myricyl behenate, stearyl lignocerate, behenyl lignocerate, and myricyl lignocerate;
• and
• said binder resin comprises a resin which contains 30% or more by weight of structure units of styrene or styrene derivatives, tetrahydrofuran soluble matter of said resin has the weight-average molecular weight of not less than 50,000, and has one or more peaks of molecular weight in both the range of not more than 5.times.10.sup.4, and the range of 1.times.10.sup.5 to 1.times.10.sup.7, respectively, on the gel permeation chromatogram.

A toner for electrostatic image development comprising:

• a lubricant,
• a binder resin, and
• a coloring agent,
• wherein said lubricant has a DSC determined endothermic peak at 50.degree.-130.degree. C., with the half value width of said endothermic peak being not more than 15.degree. C., and is represented by the formula (I) ##STR15## wherein R.sup.1 is selected from the group consisting of decyl, dodecyl, stearyl, icosyl, behenyl, tetracosyl, stearyloxyl, behenyloxyl and myricyloxyl, and R.sup.2 represents a group represented by --X--COOR.sup.3 wherein X represents an alkylene group and R.sup.3 represents an alkyl group having 10 or more carbon atoms;
• and
• said binder resin comprises a resin which contains 30% or more by weight of structure units of styrene or styrene derivatives, tetrahydrofuran soluble matter of said resin has the weight-average molecular weight of not less than 50,000, and has one or more peaks of molecular weight in both the range of not more than 5.times.10.sup.4, and the range of 1.times.10.sup.5 to 1.times.10.sup.7, respectively, on the gel permeation chromatogram.