Gunze Limited

Ube Industries, Inc.

Akira Ichino

Takashi Kuraoka

Naoki Nishiura

Takeshige Nakayama

Toru Murakami

The present invention provides a carbon black-dispersed polyamic acid solution composition having a high solids content and a high carbon black content. The invention further provides an intermediate transfer belt using the polyamic acid solution composition. The carbon black-dispersed polyamic acid solution composition is obtained by uniformly dispersing carbon black in a polyamic acid solution obtained by reacting biphenyltetracarboxylic dianhydride and an aromatic diamine in an organic polar solvent. The biphenyltetracarboxylic dianhydride includes 2,3,3',4&#x2032;-biphenyltetracarboxylic dianhydride and 3,3&#x2032;,4,4&#x2032;-biphenyltetracarboxylic dianhydride. The aromatic diamine includes 4,4&#x2032;-diaminodiphenyl ether and p-phenylenediamine. The polyamic acid solution has a solids content of 25 weight % or more.

Polyamic acid solution composition having carbon black dispersed therein, process for production of semiconductive polyimide resin belt using the composition, and semiconductive polyimide resin belt

A semiconductive polyimide resin belt that exhibits excellent electrical properties, including the ability to achieve accurate image transfer in a color image-forming unit, and the ability to prevent variations in resistance due to the transfer voltage, enabling high-quality transfer images to be stably produced over an extended period of time; and excellent physical properties, including resistance to deterioration in flatness due to plastic deformation caused by loads applied in the width direction of the belt, excellent durability, and stable operation even after extended use; and an intermediate transfer belt made of the semiconductive polyimide resin belt. The semiconductive polyimide resin belt comprises carbon black and a polyimide resin. The polyimide resin is obtained by imidization of terphenyl-3,3',4,4&#x2032;-tetracarboxylic dianhydride and an aromatic diamine component containing 50 mol % or more of an aromatic diamine having 3 and/or 4 aromatic rings based on a total amount of the aromatic diamine component.

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Moriyama, Japan

Akira Ichino