Toner
A toner, comprising a toner particle comprising a binder resin, wherein the binder resin comprises an amorphous polyester and a crystalline polyester; (i) a weight-average molecular weight of a soluble matter of the crystalline polyester in o-dichlorobenzene at 100° C. is 1500 to 4900; (ii) the crystalline polyester comprises a modified crystalline polyester having at least one terminal-modified structure selected from among a structure in which a hydroxy group at a main chain terminal of the crystalline polyester is terminal-modified with a C16 to C31 aliphatic monocarboxylic acid, and a structure in which a carboxy group at a main chain terminal of the crystalline polyester is terminal-modified with a C15 to C30 aliphatic monoalcohol; and (iii) a content ratio of the terminal-modified structure in the crystalline polyester is 80.0 mol % or higher.
1 . A toner, comprising:
a toner particle comprising a binder resin;
the binder resin comprising an amorphous polyester and a crystalline polyester;
a weight-average molecular weight of a soluble matter of the crystalline polyester in o-dichlorobenzene at 100° C. being 1800 to 2500;
a main chain of the crystalline polyester being a condensation polymer of an aliphatic dicarboxylic acid and an aliphatic diol, and a difference between the number of carbon of the aliphatic carboxylic acid and the number of carbon of the aliphatic diol being 2 or less; and
the crystalline polyester comprising a modified crystalline polyester having at least one terminal-modified structure in which (i) a hydroxy group at a main chain terminal is terminal-modified with a C16 to C31 aliphatic monocarboxylic acid, or (ii) a carboxy group at a main chain terminal of the crystalline polyester is terminal-modified with a C15 to C30 aliphatic monoalcohol, wherein
a content ratio of the terminal-modified structure in the crystalline polyester is 90.0 mol % or higher,
a content ratio of the crystalline polyester in the binder resin is 3.0 to 12.0 mass %,
a total of the acid value and the hydroxyl value of the crystalline polyester is 0.1 to 3.0 mgKOH/g, and
1.8≤SP A −SP C ≤2.1 when SP C is an SP value of the crystalline polyester, and SP A is an SP value of the amorphous polyester.
2 . The toner according to claim 1 , wherein a total content ratio in the crystalline polyester of a monomer unit of the aliphatic monocarboxylic acid and a monomer unit of the aliphatic monoalcohol included in the terminal-modified structure is 30.0 mass % or higher.
3 . The toner according to claim 1 , wherein SP C is 8.8 to 9.4 (cal/cm 3 ) 0.5 .
4 . The toner according to claim 1 , wherein SP A is 10.5 to 11.5 (cal/cm 3 ) 0.5 .
5 . The toner according to claim 1 , wherein an endothermic quantity ΔH of the toner derived from the crystalline polyester is 5.0 to 15.0 J/g measured by differential scanning calorimetric measurement.
6 . The toner according to claim 1 , wherein the toner particle comprises a hydrocarbon wax, and
0.7≤SP C −SP W ≤1.2 when SP W is an SP value of the hydrocarbon wax.
7 . The toner according to claim 6 , wherein 0.0≤|T C −T W |25.0 when T W is the melting point of the hydrocarbon wax, and T C is the melting point of the crystalline polyester.
8 . The toner according to claim 1 , wherein the amorphous polyester comprises monomer units represented by Formulae (F) and (G)
where R 4 independently represents an ethylene group or a propylene group, x and y are independently an integer of at least 1 with the proviso that the average value of x+y is 2 to 10, and R 5 represents an ethylene group or a propylene group.
9 . The toner according to claim 1 , wherein the content ratio of the terminal-modified structure in the crystalline polyester is at least 95.0 mol %.