Back to results
US 6,471,628 B1Granted
Developing roller with porous surface
AssigneeNitto Kogyo Co., Ltd.
InventorNaka Hirayama
Life of this patent
Estimating the term…
Abstract
A developing roller is provided with a roller core, an electrically conductive layer provided on a circumferential surface of the roller core, and a covering layer provided on the outer circumferential surface of the conductive layer. The covering layer has a thickness of 30 μm or less, but 0.1 μm or more, and has at least its surface region formed of a porous body.
Claims20
A developing roller which comprises:
- a roller core,
- an electrically conductive layer provided on a circumferential surface of said roller core, and
- a covering layer provided on the outer circumferential surface of said conductive layer,
- wherein said covering layer has a thickness of 30 μm or less, but 0.1 μm or more, and has at least its surface region formed of a porous body.
1 more element
A developing roller which comprises:
- a roller core,
- an electrically conductive layer provided on a circumferential surface of said roller core, and
- a covering layer provided on the outer circumferential surface of said conductive layer,
- wherein said covering layer is formed by subjecting a reaction mixture containing a polyol, an isocyanate compound, and a pore-forming agent comprising a volatile silicon oil to a reaction condition for reacting said polyol with said isocyanate compound.
1 more element
A developing roller which comprises:
- a roller core,
- an electrically conductive layer provided on a circumferential surface of said roller core, and
- a covering layer provided on the outer circumferential surface of said conductive layer,
- wherein said covering layer is formed by subjecting a reaction mixture containing a polyol, a reactive silicone oil having an active hydrogen, an isocyanate compound, and a pore-forming agent comprising a volatile silicon oil to a reaction condition for reacting said polyol and said reactive silicone oil with said isocyanate compound.
1 more element
Dependencies are inferred from the claim text.