| 主权项 |
1. A toner comprising a toner particle containing:
a binder resin; a pigment; a pigment dispersant; and a crystalline polyester,wherein
the pigment dispersant comprises a structure represented by formula (1) and a polymer moiety, and a hydrophobic parameter HP1 of the pigment dispersant and a hydrophobic parameter HP2 of the crystalline polyester satisfy the following formula,
−0.28≦(HP1−HP2)≦0.15wherein
HP1 represents a volume fraction of heptane at a point of precipitation by the pigment dispersant as measured by the addition of heptane to a solution containing 0.05 mass parts of the pigment dispersant and 1.48 mass parts of chloroform, and HP2 represents a volume fraction of heptane at a point of precipitation by the crystalline polyester as measured by the addition of heptane to a solution containing 0.05 mass parts of the crystalline polyester and 1.48 mass parts of chloroform,wherein in formula (1):
R1 represents a substituted or unsubstituted alkyl group or a substituted or unsubstituted phenyl group; Ar represents a substituted or unsubstituted aryl group; Ar and R2 to R6 satisfy at least one of the following conditions (i) and (ii): (i) Ar has a linking group that is bonded to a carbon atom in the aryl group and that forms a linking portion of bond to the polymer moiety, and (ii) at least one of R2 to R6 is a linking group that forms a linking portion of bond to the polymer moiety; each of the R2 to R6 that is not a linking group independently represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a hydroxyl group, an amino group, a cyano group, a trifluoromethyl group, a carboxyl group, or a group represented by the following formula (2-1) or a group represented by the following formula (2-2); and Ar and R2 to R6 satisfy at least one of the following conditions (iii) and (iv): (iii) Ar has a group represented by formula (2-1) or a group represented by formula (2-2) as a substituent, and (iv) at least one of R2 to R6 is a group represented by formula (2-1) or a group represented by formula (2-2),wherein in formula (2-1):
* represents a site where the group bonds to the Ar or the aromatic ring having R2 to R6 in formula (1); R7 represents a hydrogen atom, a substituted or unsubstituted alkyl group, an aralkyl group, a substituted or unsubstituted alkyloxycarbonyl group, or a substituted or unsubstituted aralkyloxycarbonyl group; A1 represents an oxygen atom, a sulfur atom, or an NR8 group; and R8 represents a hydrogen atom, a substituted or unsubstituted alkyloxycarbonyl group, or a substituted or unsubstituted aralkyloxycarbonyl group,wherein in formula (2-2):
* and ** each represent a site where the group bonds to the Ar or the aromatic ring having R2 to R6 in formula (1); the group represented by formula (2-2) forms a 5-membered heterocycle by bonding with the Ar or the aromatic ring having R2 to R6 in formula (1); A2 represents an oxygen atom, a sulfur atom, or an NR8 group; and R8 represents a hydrogen atom, a substituted or unsubstituted alkyloxycarbonyl group, or a substituted or unsubstituted aralkyloxycarbonyl group. |
