Toner, method of producing the same, developer, and image forming apparatus
View Patent ↗A toner that when the complex elastic modulus measured at an angular frequency of 6.28 rad/sec., and a strain amount of 0.3% is 1×10 6 Pa or more and 1×10 8 Pa or less, the tangent loss is 0.5 or more and 1.8 or less.
1. A toner wherein: when the complex elastic modulus measured at an angular frequency of 6.28 rad/sec., and a strain amount of 0.3% is 1×10 6 Pa or more and 1×10 8 Pa or less, the tangent loss is 0.5 or more and 1.8 or less.
2. The toner according to claim 1 , comprising a crystalline resin and a non-crystalline resin, wherein the acid value of the crystalline resin is 5 to 50 mgKOH/g, and the acid value of the non-crystalline resin is 10 to 50 mgKOH/g.
3. The toner according to claim 2 , wherein the melting temperature of the crystalline resin in accordance with ASTM D3418-8 is 50 to 100° C., and the glass transition temperature (Tg) of the non-crystalline resin is 50 to 65° C.
4. The toner according to claim 2 , wherein the weight-average molecular weight (Mw) of the crystalline resin is 8,000 to 35,000 and the weight-average molecular weight (Mw) of the non-crystalline resin is 20,000 to 50,000.
5. The toner according to claim 2 , wherein the ratio by weight of the crystalline resin to the non-crystalline resin is 5/95 to 40/60.
6. The toner according to claim 2 , wherein the softening temperature of the non-crystalline resin is 60 to 90° C.
7. The toner according to claim 2 , wherein the crystalline resin is a crystalline aliphatic polyester resin having an alkyl group having 6 or more carbon atoms.
8. The toner according to claim 7 , wherein the acid component of the crystalline polyester comprises a dodecenylsuccinic acid component.
9. The toner according to claim 1 , comprising a release agent, wherein the amount of the release agent is 0.5 to 30% by weight with respect to the total amount of the toner.
10. The toner according to claim 1 , having a volume-average particle size distribution index GSDv of 1.30 or less.
11. A method of producing the toner recited in claim 1 , the method comprising:
dissolving, into a predetermined solvent, both of a crystalline resin about which an endothermic peak is detected by differential scanning calorimetry and a non-crystalline resin about which a stepwise change in endothermic amount is detected by differential scanning calorimetry, thereby obtaining a resin solution;
generating toner particle nuclei by subjecting the resin solution obtained in the dissolving to phase inversion emulsification; and
generating toner particles on the basis of the nuclei obtained in the generating of the toner particle nuclei.
12. The method according to claim 11 , further comprising classifying the toner particles.
13. A developer comprising:
a toner wherein when the complex elastic modulus measured at an angular frequency of 6.28 rad/sec., and a strain amount of 0.3% is 1×10 6 Pa or more and 1×10 8 Pa or less, the tangent loss is 0.5 or more and 1.8 or less; and
a carrier.
14. The developer according to claim 13 , wherein the carrier comprises a nucleus particle and a covering resin.
15. The developer according to claim 14 , wherein the amount of the covering resin is 0.1 to 10 parts by weight for 100 parts by weight of the nucleus particle.
16. The developer according to claim 14 , wherein the covering resin obtained by polymerizing a polymerizable monomer having a vinyl double bond.
17. An image forming apparatus comprising:
an image holding body that holds an image formed on a surface of the image holding body;
an image forming unit that forms an image on the surface of the image holding body by a toner wherein when the complex elastic modulus measured at an angular frequency of 6.28 rad/sec. and a strain amount of 0.3% is 1×10 6 Pa or more and 1×10 8 Pa or less, the tangent loss is 0.5 or more and 1.8 or less;
a transferring unit that transfers the image held on the image holding body to a transferred object; and
a fixing unit that fixes the transferred image.