Toner
A toner comprising a toner particle including a binder resin and a crystalline polyester resin, wherein the binder resin is an amorphous polyester resin having a linear alkyl group at a molecular chain terminal; the crystalline polyester resin is a polycondensate of a diol and a dicarboxylic acid; the number of carbon atoms C aPES of the linear alkyl group, the number of carbon atoms C OH of the diol, and the number of carbon atoms C Ac of the dicarboxylic acid, excluding carbon that belongs to carboxyl groups, satisfy the following relationships; and a glass transition temperature of the toner as measured by a differential scanning calorimeter is from 40.0° C. to 55.0° C. 8≤C aPES ≤20 (1) C Ac /C OH ≥3.5 and 0≤|C Ac −C aPES |≤3 (2) C OH /C Ac ≥3.5 and 0≤|C OH −C aPES |≤3 (3)
1. A toner comprising a toner particle including a binder resin and a crystalline polyester resin, wherein
the binder resin is an amorphous polyester resin having a linear alkyl group at a molecular chain terminal,
the crystalline polyester resin is a polycondensate of a diol and a dicarboxylic acid,
where the number of carbon atoms of the linear alkyl group is denoted by C aPES , the number of carbon atoms of the diol is denoted by C OH , and the number of carbon atoms of the dicarboxylic acid, excluding carbon that belongs to carboxyl groups, is denoted by C Ac ,
the C aPES , the C OH , and the C Ac satisfy the following relationships (1), and (2) or (3), and
a glass transition temperature of the toner as measured by a differential scanning calorimeter is from 40.0° C. to 55.0° C.
8≤C aPES ≤20 (1)
C Ac /C OH ≥3.5 and 0≤|C Ac −C aPES |≤3 (2)
C OH /C Ac ≥3.5 and 0≤|C OH −C aPES |≤3. (3)
2. The toner according to claim 1 , wherein the molecular chain terminal is a group formed by detachment of a hydrogen atom of a hydroxyl group of a linear alkyl monoalcohol or a group formed by detachment of a hydrogen atom of a carboxyl group of a linear alkyl monocarboxylic acid, and
the linear alkyl group is an alkyl group included in the group formed by detachment of a hydrogen atom of a hydroxyl group of a linear alkyl monoalcohol or the group formed by detachment of a hydrogen atom of a carboxyl group of a linear alkyl monocarboxylic acid.
3. The toner according to claim 1 , wherein
where a solubility parameter of the amorphous polyester resin is denoted by SP aPES (cal/cm 3 ) 1/2 , and a solubility parameter of the crystalline polyester resin is denoted by SP cPES (cal/cm 3 ) 1/2 ,
the SP aPES and the SP cPES satisfy the following relationship (4), and
a melting point of the crystalline polyester resin is from 75° C. to 100° C.
1.00 (cal/cm 3 ) 1/2 ≤(SP aPES −SP cPES )≤1.50 (cal/cm 3 ) 1/2 . (4)
4. The toner according to claim 1 , wherein the C aPES , the C OH , and the C Ac satisfy the following relationships (1), and (2)′ or (3)′
8≤C aPES ≤20 (1)
C Ac /C OH ≥3.5 and C Ac =C aPES (2)′
C OH /C Ac ≥3.5 and C OH =C aPES . (3)′