Toner for developing electrostatic latent image, developer for developing electrostatic latent image, and process for producing toner for developing electrostatic latent image
View Patent ↗A toner for developing an electrostatic latent image includes a binder resin, a colorant and a releasing agent. The releasing agent contains a hydrocarbon component including a linear hydrocarbon component, and the liner hydrocarbon component has a carbon number distribution and an average carbon number N. An amount of a component having a carbon number of from N−4 to N+4 in the releasing agent is 80% by mass or more based on the total mass of the hydrocarbon component of the releasing agent. An amount of a component having a carbon number of N−10 or less in the releasing agent is 0.05% by mass or less based on the total mass of the hydrocarbon component of the releasing agent, and an amount of a component having a carbon number of N+10 or more in the releasing agent is 0.05% by mass or less based on the total mass of the hydrocarbon component of the releasing agent.
1. A toner for developing an electrostatic latent image, comprising:
a binder resin;
a colorant; and
a releasing agent, the releasing agent comprises a hydrocarbon comprising a linear hydrocarbon,
wherein:
the linear hydrocarbon has a carbon number distribution and an average carbon number N, wherein N is from 40 to 60 carbon atoms
an amount of the linear hydrocarbon having a carbon number of from N−4 to N+4 in the releasing agent is 80% by mass or more based on the total mass of the hydrocarbon of the releasing agent,
an amount of the linear hydrocarbon having a carbon number of N−10 or less in the releasing agent is 0.05% by mass or less based on the total mass of the hydrocarbon of the releasing agent, and
an amount of the linear hydrocarbon having a carbon number of N+10 or more in the releasing agent is 0.05% by mass or less based on the total mass of the hydrocarbon of the releasing agent.
2. The toner according to claim 1 , the hydrocarbon further comprising a branched hydrocarbon, wherein an amount of the branched hydrocarbon in the releasing agent is from 4 to 30% by mass based on the total mass of the hydrocarbon of the releasing agent.
3. The toner according to claim 1 , wherein the releasing agent has a melt viscosity at 120° C. of from 1 to 9 mPa·s.
4. The toner according to claim 1 , wherein a volume average particle diameter distribution index GSDv (D84v/D16v) 0.5 of the toner is 1.30 or less.
5. The toner according to claim 1 , wherein a shape factor SF1 of the toner is from 110 to 140.
6. A toner for developing an electrostatic latent image, comprising:
a binder resin;
a colorant; and
a releasing agent, the releasing agent comprising a hydrocarbon comprising a linear hydrocarbon and a branched hydrocarbon,
wherein:
an amount of the branched hydrocarbon having a carbon number of 40 or less is 2% by mass or less based on the total mass of the hydrocarbon of the releasing agent,
the releasing agent has a melting point of from 70 to 100° C., and
the toner has a melting heat amount derived from the releasing agent of 17 J/g or less measured with a DSC.
7. The toner according to claim 6 , wherein an amount of the branched hydrocarbon in the releasing agent is from 4 to 30% by mass based on the total mass of the hydrocarbon of the releasing agent.
8. The toner according to claim 6 , wherein the releasing agent is at least one of a paraffin wax and a polyethylene wax, purified through crystallization from a solvent.
9. The toner according to claim 6 , wherein the releasing agent is at least one of a paraffin wax and a polyethylene wax, which are purified through molecular distillation.
10. The toner according to claim 6 , wherein the releasing agent has a melt viscosity at 120° C. of from 1 to 9 mPa·s.
11. The toner according to claim 6 , wherein a volume average particle diameter distribution index GSDv (D84v/D16v) 0.5 of the toner is 1.30 or less.
12. The toner according to claim 6 , wherein a shape factor SF1 of the toner is from 110 to 140.
13. A toner for developing an electrostatic latent image, comprising:
a binder resin;
a colorant; and
a releasing agent, the releasing agent comprising a hydrocarbon comprising a linear hydrocarbon and a branched hydrocarbon,
wherein:
an amount of the linear hydrocarbon in the releasing agent is 70% by mass or more based on the total mass of the hydrocarbon of the releasing agent,
the branched hydrocarbon has a carbon number distribution,
an amount of the branched hydrocarbon having a carbon number of 40 or less in the releasing agent is 2% by mass or less based on the total mass of the hydrocarbon of the releasing agent, and
the releasing agent has an endothermic curve measured with a DSC, in which a ratio (b/a×100) is 2.5 or less,
where
a (J/g) represents an endothermic amount per unit amount at 50° C. or lower, and
b (J/g) represents a total endothermic amount per unit amount.
14. The toner according to claim 13 , wherein an amount of the branched hydrocarbon in the releasing agent is from 4 to 30% by mass based on the total mass of the hydrocarbon of the releasing agent.
15. The toner according to claim 13 , wherein the releasing agent is at least one of a paraffin wax and a polyethylene wax, purified through crystallization from a solvent.
16. The toner according to claim 13 , wherein the releasing agent is at least one of a paraffin wax and a polyethylene wax, which are purified through molecular distillation.
17. The toner according to claim 13 , wherein the releasing agent has a melt viscosity at 120° C. of from 1 to 9 mPa·s.
18. The toner according to claim 13 , wherein a volume average particle diameter distribution index GSDv (D84v/D16v) 0.5 of the toner is 1.30 or less.