Intermediate transfer belt, production method for the same, and image forming device provided with the same
View Patent ↗The present invention provides an intermediate transfer belt, wherein: the intermediate transfer belt is made from a resin material comprising a carbon black in a dispersed state; an absolute value of a difference between a common logarithm value of surface resistivity 10 seconds after voltage application and a common logarithm value of the surface resistivity 30 milliseconds after voltage application is about 0.2 ((Log Ω/□) or less; and a Young's modulus thereof is about 3,500 MPa or more. The intermediate transfer belt is preferably formed by a process comprising: dispersing the carbon black in a polyamide acid solution to prepare a dispersant; developing the dispersant in a ring-like shape to form a developing layer; drying the developing layer to make a film to mold into a belt shape to form a molded article; and heat-treating the molded article to convert polyamide acid into imide.
1. An intermediate transfer belt, wherein: the intermediate transfer belt is made from a resin material comprising a carbon black in a dispersed state; the composition of the intermediate transfer belt is made so as to have properties of an absolute value of a difference between a common logarithm value of surface resistivity 10 seconds after voltage application and a common logarithm value of the surface resistivity 30 milliseconds after voltage application is about 0.2 (Log Ω/□) or less, and a Young's modulus of about 3,500 MPa or more.
2. An intermediate transfer belt according to claim 1 , wherein the common logarithm value of the surface resistivity 30 milliseconds after voltage application is about 9 to 13 (Log Ω/□).
3. An intermediate transfer belt according to claim 1 , wherein the common logarithm value of the surface resistivity 30 milliseconds after voltage application is 10 to 12 (Log Ω/□).
4. An intermediate transfer belt according to claim 1 , wherein a common logarithm value of volume resistivity is in a range of about 8 to 13 (Log Ωcm ).
5. An intermediate transfer belt according to claim 1 , wherein a surface micro hardness of a transfer surface of the intermediate transfer belt is about 30 or smaller.
6. An intermediate transfer belt according to claim 1 , wherein a surface micro hardness of a transfer surface of the intermediate transfer belt is about 25 or smaller.
7. An intermediate transfer belt according to claim 1 , wherein the Young's modulus is over about 4,000 and less than about 10,000 MPa.
8. An intermediate transfer belt according to claim 1 , wherein a total thickness of the intermediate transfer belt is in a range of about 0.05 to 0.5 mm.
9. An intermediate transfer belt according to claim 1 , wherein the resin material comprises a polyimide resin as a main component.
10. An intermediate transfer belt according to claim 1 , wherein the carbon black is an acidic carbon black having a pH of 5 or lower.
11. An intermediate transfer belt according to claim 9 , wherein the intermediate transfer belt is formed by a process comprising:
dispersing the carbon black in a polyamide acid solution so as to prepare a dispersant;
developing the dispersant in a ring-like shape to form a developing layer;
drying the developing layer to make a film to mold into a belt shape to form a molded article; and
heat-treating the molded article to convert polyamide acid into imide.
12. An image forming device comprising:
a first transfer apparatus for primarily transferring a toner image formed on an image bearing body onto an intermediate transfer belt; and
a second transfer apparatus for secondarily transferring the toner image transferred onto the intermediate transfer belt onto a transfer medium,
wherein the intermediate transfer belt is made from a resin material comprising a carbon black in a dispersed state; and the transfer belt is made so as to have the properties of an absolute value of a difference between a common logarithm value of surface resistivity 10 seconds after voltage application and a common logarithm value of the surface resistivity 30 milliseconds after voltage application is 0.2 (Log Ω/□) or less, and a Young's modulus of about 3,500 MPa or more.
13. An image forming device according to claim 12 , wherein the common logarithm value of the surface resistivity 30 milliseconds after voltage application is about 9 to 13 (Log Ω/□).
14. An image forming device according to claim 12 , wherein the common logarithm value of the surface resistivity 30 milliseconds after voltage application is 10 to 12 (Log Ω/□).
15. An image forming device according to claim 12 , wherein a common logarithm value of volume resistivity is in a range of about 8 to 13 (Log Ωcm).
16. An image forming device according to claim 12 , wherein a surface micro hardness of a transfer surface of the intermediate transfer belt is about 30 or smaller.
17. An image forming device according to claim 12 , wherein a surface micro hardness of a transfer surface of the intermediate transfer belt is about 25 or smaller.
18. An image forming device according to claim 12 , wherein the Young's modulus is over about 4,000 and less than about 10,000 MPa.
19. An image forming device according to claim 12 , wherein a total thickness of the intermediate transfer belt is in a range of about 0.05 to 0.5 mm.
20. An image forming device according to claim 12 , wherein the carbon black is an acidic carbon black having a pH of 5 or lower.