Developing roller
OwnerKeiichiro JURI, Chiyoshi Nozaki +2inventors
InventorsKeiichiro JURI, Chiyoshi Nozaki, Hideaki Yasunaga, Shuuichi Nakagawa
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Abstract
A developing roller including: an electrically-conductive base; an elastic layer formed on an outer circumference of the electrically-conductive base; and a toner bearing layer formed on the elastic layer, wherein the toner bearing layer contains a polyurethane resin having an isocyanurate structure, and wherein the polyurethane resin has a ratio A/B of 1.0 to 10.0 where A denotes absorbance attributed to C═O of cyanurate and B denotes absorbance attributed to C═O of urethane in an infrared absorption spectrum of the polyurethane resin obtained by an ATR method.
Claims7
A developing roller comprising:
- an electrically-conductive base;
- an elastic layer formed on an outer circumference of the electrically-conductive base;
- and
- a toner bearing layer formed on the elastic layer,
- wherein the toner bearing layer contains a polyurethane resin having an isocyanurate structure, and
- wherein the polyurethane resin has a ratio A/B of 1.0 to 10.0 where A denotes absorbance attributed to C═O of cyanurate and B denotes absorbance attributed to C═O of urethane in an infrared absorption spectrum of the polyurethane resin obtained by an ATR method.
A developing device comprising:
- a developing roller configured to bear on a surface thereof a developer to be supplied to a latent image bearing member;
- a developer supplying member configured to supply the developer onto the surface of the developing roller;
- a developer layer regulating member configured to form a thin layer of the developer on the surface of the developing roller, and
- a developer container which houses the developer,
- wherein the developing roller comprises:
- an electrically-conductive base,
- an elastic layer formed on an outer circumference of the electrically-conductive base, and
- a toner bearing layer formed on the elastic layer,
- wherein the toner bearing layer contains a polyurethane resin having an isocyanurate structure, and
- wherein the polyurethane resin has a ratio A/B of 1.0 to 10.0 where A denotes absorbance attributed to C═O of cyanurate and B denotes absorbance attributed to C═O of urethane in an infrared absorption spectrum of the polyurethane resin obtained by an ATR method.
An image forming apparatus comprising:
- a latent image bearing member;
- a charging unit configured to charge a surface of the latent image bearing member;
- an exposing unit configured to expose the charged surface of the latent image bearing member to light to form an electrostatic latent image;
- a developing unit configured to develop the electrostatic latent image with a developer to form a visible image;
- a transfer unit configured to transfer the visible image to a recording medium;
- and
- a fixing unit configured to fix the transferred image on the recording medium,
- wherein the developing unit is a developing device which comprises:
- a developing roller configured to bear on a surface thereof the developer to be supplied to the latent image bearing member;
- a developer supplying member configured to supply the developer onto the surface of the developing roller;
- a developer layer regulating member configured to form a thin layer of the developer on the surface of the developing roller, and
- a developer container which houses the developer,
- wherein the developing roller comprises:
- an electrically-conductive base;
- an elastic layer formed on an outer circumference of the electrically-conductive base;
- and
- a toner bearing layer formed on the elastic layer,
- wherein the toner bearing layer contains a polyurethane resin having an isocyanurate structure, and
- wherein the polyurethane resin has a ratio A/B of 1.0 to 10.0 where A denotes absorbance attributed to C═O of cyanurate and B denotes absorbance attributed to C═O of urethane in an infrared absorption spectrum of the polyurethane resin obtained by an ATR method.
Dependencies are inferred from the claim text.