Toner and method of producing toner
Provided is a toner having a toner particle that contains a binder resin and a wax, wherein the solubility parameter S P of the binder resin is at least 9.4 and not more than 10.0; the binder resin contains a resin having a structure represented by the following formula (1) in the terminal position on a main chain of the resin, *—CO—R formula (1) (in formula (1), R represents a phenyl group or a derivative thereof, or —COOR 1 , R 1 represents an alkyl group having 1 to 4 carbons, and * represents a bond to the main chain of the resin); the solubility parameter S W of the wax is at least 8.1 and not more than 9.0; and S P and S W satisfy formula (2), | S P −S W |>0.5 formula (2).
1. A toner comprising a toner particle that contains a binder resin and a wax, wherein
the solubility parameter S P of the binder resin is at least 9.4 and not more than 10.0,
the binder resin contains a resin having a structure represented by the following formula (1) in the terminal position on a main chain of the resin,
*—CO—R formula (1)
wherein in formula (1), R represents a phenyl group or a derivative thereof, or —COOR 1 , R 1 represents an alkyl group having 1 to 4 carbons, and * represents a bond to the main chain of the resin,
the solubility parameter S W of the wax is at least 8.1 and not more than 9.0, and
S P and S W satisfy formula (2).
| S P −S W |>0.5 formula (2)
2. The toner according to claim 1 , wherein the molecular weight of the wax is not more than 2,500.
3. The toner according to claim 1 , wherein the binder resin contains a vinyl resin.
4. The toner according to claim 1 , wherein the content of the wax in the toner particle is at least 1 mass % and not more than 30 mass %.
5. The toner according to claim 1 , wherein the abundance of the structure represented by formula (1) in the binder resin is at least 5% and not more than 100%.
6. A method of producing the toner according to claim 1 , the method comprising the step of obtaining the binder resin by polymerizing a polymerizable monomer composition containing:
a polymerization initiator;
a polymerizable monomer; and
a vinyl ether addition-fragmentation chain transfer agent represented by formula (3);
wherein in formula (3), R 2 represents —COOR 1 or a phenyl group or a derivative thereof, R 1 represents an alkyl group having 1 to 4 carbons, and R 3 represents a benzyl group or a secondary or tertiary alkyl group having 4 to 8 carbons.
7. A method of producing a toner having a toner particle that contains a binder resin, the method comprising the steps of:
dispersing, in an aqueous medium, a polymerizable monomer composition containing a chain transfer agent, a polymerization initiator, and a polymerizable monomer capable of forming the binder resin, to form a liquid droplet of the polymerizable monomer composition; and
producing a toner particle by polymerizing the polymerizable monomer in the liquid droplet,
wherein the polymerizable monomer contains at least one selected from the group consisting of styrene, acrylate esters, and methacrylate esters, and
the chain transfer agent is a vinyl ether addition-fragmentation chain transfer agent represented by formula (3)
wherein in formula (3), R 2 represents —COOR 1 or a phenyl group or a derivative thereof, R 1 represents an alkyl group having 1 to 4 carbons, and R 3 represents a benzyl group or a secondary or tertiary alkyl group having 4 to 8 carbons.
8. The toner production method according to claim 7 , wherein the amount of addition of the chain transfer agent is at least 0.1 mass parts and not more than 5.0 mass parts per 100.0 mass parts of the polymerizable monomer.
9. The toner production method according to claim 7 , wherein the polymerization initiator is an alkyl peroxyester organoperoxide, a diacyl peroxide organoperoxide, or an azo compound.
10. The toner production method according to claim 7 , wherein R 2 in formula (3) is —COOCH 3 or a phenyl group or a derivative thereof, and R 3 is a benzyl group, isobutyl group, or tert-butyl group.
11. The toner production method according to claim 7 , wherein the chain transfer agent is at least one selected from the group consisting of formulas (4) to (6).