Developing roller, process for producing developing roller,...

Details Developing roller, process for producing developing roller,... Developing roller, process for producing developing roller,...

2008-10-09

2009-08-25

Chen, Sophia S (Department: 2852)

Electrophotography

Image formation

Development

Reexamination Certificate

active

07580660

ABSTRACT:
A developing roller has a conductive shaft member, a conductive elastic layer formed around the shaft member in a thickness of 0.5 mm to 6.0 mm, and a surface layer. The elastic layer contains carbon black and silicone rubber. The carbon black is in a content of 7% to 17% by mass and has at least two peaks in its particle size number distribution. The minimum diameter peak center in the particle size number distribution is within the range of 10 nm to 40 nm. The elastic layer has density within the range of 1.01 g/cm3to 1.07 g/cm3. Where the ratios of carbon atoms to silicon atoms (C/Si), in the vicinity of the surface of the elastic layer, at depths of 100 μm and 200 μm from the surface of the elastic layer are represented by X, Y and Z, respectively, the X, Y and Z satisfy a specific relationship.

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International Search Report, dated Jul. 22, 2008, of PCT/JP2008/057651, filed Apr. 15, 2008.

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