Process for producing toner for electrostatic charge image development toner for electrostatic charge image development
View Patent ↗To provide a process for efficiently producing a toner for developing an electrostatic charge image, which is scarcely susceptible to aggregation of the toner and free from blocking during the storage or from soiling the image forming apparatus and which is excellent in image characteristics. A process for producing a toner for developing an electrostatic charge image, characterized by supplying a monomer into a dispersion containing wax and a polymerizable monomer having a C 8-100 hydrocarbon group, carrying out the polymerization, followed by flocculation treatment.
1. A toner for developing an electrostatic charge image, which comprises a binder resin and wax, wherein the binder resin comprises a copolymer prepared by using as a starting material, a (meth)acrylate monomer having a C 8-100 linear hydrocarbon group, and the content of the (meth)acrylate monomer having a C 8-100 linear hydrocarbon group is less than 2 wt % of the entire binder resin and—wherein the number of wax domains satisfying the following formula (1) among wax domains observed by its TEM analysis, is at least 85.0% of the total:
(1) 0<A<500 (A: equiareal circle diameter (nm))
wherein said copolymer is present at the interface between the binder resin and the wax, and
wherein said toner is produced by a process comprising supplying a monomer into an aqueous dispersion containing wax and a (meth)acrylate having a C 8-100 linear hydrocarbon group, carrying out the polymerization, followed by flocculation treatment.
2. The toner according to claim 1 , wherein the number of wax domains satisfying the following formula (2) among wax domains observed by its TEM analysis, is at least 60.0% of the total:
(2) 0<A<350 (A: equiareal circle diameter (nm)).
3. The toner according to claim 1 , wherein the number of wax domains satisfying the following formula (3) among wax domains observed by its TEM analysis, is at least 40.0% of the total:
(3) 0<A<250 (A: equiareal circle diameter (nm)).
4. The toner according to claim 3 , wherein the number of wax domains satisfying the formula (3) is at least 50.0% of the total.
5. The toner according to claim 1 , wherein the number of wax domains satisfying the following formula (4) among wax domains observed by its TEM analysis, is at least 15.0% of the total:
(4) 50<A<150 (A: equiareal circle diameter (nm)).
6. The toner according to claim 5 , wherein the number of wax domains satisfying the formula (4) is at least 25.0% of the total.
7. The toner according to claim 1 , wherein the main peak in the equiareal circle diameter distribution in number of wax domains observed by its TEM analysis, is present at less than 200 nm.
8. The toner according to claim 7 , wherein the main peak in the equiareal circle diameter distribution in number of wax domains observed by its TEM analysis, is present at 100 or larger nm.
9. The toner according to claim 1 , wherein the volume dispersed particle diameter of the aqueous dispersion is at most 2 μm.
10. The toner according to claim 1 , wherein the (meth)acrylate monomer having a C 8-100 linear hydrocarbon group is a (meth)acrylate monomer having a C 12-100 linear hydrocarbon group.
11. The toner according to claim 1 , wherein the hydrocarbon in the (meth)acrylate monomer having a C 8-100 linear hydrocarbon group is at least one member selected from the group consisting of lauryl, cetyl and stearyl groups.