Polyimide seamless belt for image forming apparatus
AssigneeRicoh Company, Ltd.
InventorsSachiko Takeda, Shigeru Hashiura, Kenji Ohta, Asae Kamata
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Abstract
A polyimide seamless belt for an image forming apparatus, which contains: polyimide containing a segment derived from aromatic diamine, and a segment derived from aromatic tetracarboxylic acid; and two types of carbon black, which are high-structure carbon black capable of imparting high conductivity, and acidic carbon black, where the two types of the carbon black are dispersed in the polyimide seamless belt, wherein the polyimide seamless belt has surface resistivity of 108Ω/□ or less.
Claims8
A polyimide seamless belt for an image forming apparatus, comprising:
- polyimide containing a segment derived from aromatic diamine, and a segment derived from aromatic tetracarboxylic acid;
- and
- two types of carbon black, which are high-structure carbon black capable of imparting high conductivity, and acidic carbon black, where the two types of the carbon black are dispersed in the polyimide seamless belt,
- wherein the polyimide seamless belt has surface resistivity of 108Ω/□ or less.
A production method of a polyimide seamless belt, comprising:
- preparing a polyimide precursor coating liquid, in which polyamic acid that is a polyimide precursor obtained through a reaction between aromatic diamine and aromatic tetracarboxylic acid, high-structure carbon black capable of imparting high conductivity, and acidic carbon black are dissolved or dispersed in an organic solvent;
- forming a seamless belt shaped product having a predetermined thickness with the coating liquid;
- and
- drying the seamless belt shaped product, followed by converting the polyamic acid into polyimide, to thereby produce a polyimide seamless belt having surface resistivity of 108Ω/□ or less,
- wherein the polyimide seamless belt contains the polyimide containing a segment derived from the aromatic diamine, and a segment derived from the aromatic tetracarboxylic acid.
An image forming apparatus, comprising:
- an electrostatic latent image forming unit configured to form an electrostatic latent image on an image bearer;
- a developing unit configured to develop the electrostatic latent image formed on the image bearer with a toner to form a toner image;
- a primary transfer unit configured to transfer the toner image from the image bearer onto an intermediate transfer member, where the intermediate transfer member may be a seamless belt;
- a secondary transfer unit configured to transfer the toner image from the intermediate transfer member onto a recording medium;
- and
- a fixing unit which is configured to fix the toner image on the recording medium and may contain a seamless belt member,
- wherein at least one of the seamless belts used in the image forming apparatus is a polyimide seamless belt which contains:
- polyimide containing a segment derived from aromatic diamine, and a segment derived from aromatic tetracarboxylic acid;
- and
- two types of carbon black, which are high-structure carbon black capable of imparting high conductivity, and acidic carbon black, where the two types of the carbon black are dispersed in the polyimide seamless belt,
- wherein the polyimide seamless belt has surface resistivity of 108Ω/□ or less.
Dependencies are inferred from the claim text.