Intermediary transfer belt and image forming apparatus
An intermediary transfer belt includes a base layer; an elastic layer laminated on or above the base layer and formed with a silicone rubber as an elastic member; an intermediary layer laminated on or above the elastic layer; and a surface layer laminated on or above the intermediary layer. The elastic layer is 60 degrees or less in JIS-A hardness and is 5 degrees or more in JIS-E hardness. The intermediary layer is 0.1 g/m 2 ·24 h or more and 600 g/m 2 ·24 h or less in water vapor permeability coefficient and is 1 μm or more and 15 μm or less in average thickness.
1. An intermediary transfer belt comprising:
a base layer;
an elastic layer provided on or above said base layer and formed with a silicone rubber as an elastic member;
an intermediary layer provided on or above said elastic layer; and
a surface layer provided on or above said intermediary layer,
wherein said elastic layer is 60 degrees or less in JIS-A hardness and is 5 degrees or more in JIS-E hardness, and
wherein said intermediary layer is 0.1 g/m 2 ·24 h or more and 600 g/m 2 ·24 h or less in water vapor permeability coefficient and is 1 μm or more and 15 μm or less in average thickness.
2. An intermediary transfer belt according to claim 1 , wherein said intermediary layer is 100 g/m 2 ·24 h or less in water vapor permeability coefficient.
3. An intermediary transfer belt according to claim 1 , wherein said intermediary layer is formed of urethane resin material, polyamide resin material, polyvinylidene chloride resin material, fluorine-containing resin material or cellulose acetate resin material.
4. An intermediary transfer belt according to claim 1 , further comprising a SiO 2 layer provided between said elastic layer and said intermediary layer.
5. An intermediary transfer belt according to claim 4 , wherein said SiO 2 layer is 0.1 μm or more and 2.0 μm or less in average thickness.
6. An intermediary transfer belt according to claim 1 , further comprising a surface modifying layer formed by subjecting said elastic layer to excimer ultraviolet irradiation.
7. An intermediary transfer belt according to claim 6 , wherein said surface modifying layer is 0.1 μm or more and 2.0 μm or less in average thickness.
8. An intermediary transfer belt according to claim 1 , wherein said elastic layer is 130% or more and 160% or less in degree of swelling as measured by a toluene swelling method.
9. An intermediary transfer belt according to claim 1 , wherein said elastic layer contains an ion conductive agent.
10. An intermediary transfer belt according to claim 1 , which is 100 μm or more and 1000 μm or less in thickness.
11. An intermediary transfer belt according to claim 1 , which is 1.0×10 8 Ω·cm or more and 1.0×10 13 Ω·cm in volume resistivity.
12. An intermediary transfer belt according to claim 1 , which is 1.0×10 9 Ω/square or more and 1.0×10 13 Ω/square or less in surface resistivity as measured from said surface layer side.
13. An image forming apparatus comprising:
an image forming portion; and
an intermediary transfer belt according to claim 1 .