Conductive rubber composition and process for the production thereof

A process for producing a conductive rubber composition, which comprises the steps of kneading a rubber component (A), a rubber component (B) vulcanized by a mechanism different from that in the rubber component (A), conductive particles, and a vulcanizing agent for the rubber component (A), and vulcanizing only the rubber component (A).

A process for producing a conductive rubber composition, which comprises the steps of kneading a rubber component (A), a rubber component (B) vulcanized by a mechanism different from that in the rubber component (A), a vulcanizing agent for the rubber component (A), and a part of conductive particles to be incorporated, vulcanizing only the rubber component (A), and then adding a vulcanizing agent for the rubber component (B) and the remainder of the conductive particles to be incorporated.

A process for producing a conductive rubber composition, which comprises the steps of kneading a rubber component (A), a rubber component (B) vulcanized by a mechanism different from that in the rubber component (A), and a vulcanizing agent for the rubber component (A), vulcanizing only the rubber component (A), and then adding a vulcanizing agent for the rubber component (B) and conductive particles.

A conductive rubber member comprising a vulcanizate of a rubber component (A), a vulcanizate of a rubber component (B) vulcanized by a mechanism different from that in the rubber component (A), and conductive particles, wherein the vulcanizate of the rubber component (A) is vulcanized with a vulcanizing agent which can not vulcanize the rubber component (B) under the vulcanizing conditions of the rubber (A), and wherein the vulcanizate of the rubber component (A) is dispersed in the vulcanizate of the rubber component (B), and at least the vulcanizate of the rubber component (B) contains the conductive particles.

A process for producing a conductive rubber member, which comprises the steps of kneading a rubber component (A), a rubber component (B) vulcanized by a mechanism different from that in the rubber component (A), conductive particles, and a vulcanizing agent for the rubber component (A), vulcanizing only the rubber component (A), adding and kneading a vulcanizing agent for the rubber component (B), forming the resultant mixture into the desired shape, and then vulcanizing the rubber component (B).

A process for producing a conductive rubber member, which comprises the steps of kneading a rubber component (A), a rubber component (B) vulcanized by a mechanism different from that in the rubber component (A), a vulcanizing agent for the rubber component (A), and a part of conductive particles to be incorporated, vulcanizing only the rubber component (A), adding and kneading a vulcanizing agent for the rubber component (B), and the remainder of the conductive particles to be incorporated, forming the resultant mixture into the desired shape, and then vulcanizing the rubber component (B).

A process for producing a conductive rubber member, which comprises the steps of kneading a rubber component (A), a rubber component (B) vulcanized by a mechanism different from that in the rubber component (A), and a vulcanizing agent for the rubber component (A), vulcanizing only the rubber component (A), adding and kneading a vulcanizing agent for the rubber component (B), and conductive particles, forming the resultant mixture into the desired shape, and then vulcanizing the rubber component (B).

A conductive rubber-covered roll comprising a conductive mandrel, and a coating rubber layer containing conductive particles and formed on the peripheral surface of the mandrel, wherein the coating rubber layer comprises a vulcanizate of a rubber component (A), a vulcanizate of a rubber component (B) vulcanized by a mechanism different from that in the rubber component (A), and the conductive particles, and wherein the vulcanizate of the rubber component (A) is vulcanized with a vulcanizing agent which can not vulcanize the rubber component (B) under the vulcanizing conditions of the rubber (A), and further wherein the vulcanizate of the rubber component (A) is dispersed in the vulcanizate of the rubber component (B), and at least the vulcanizate of the rubber component (B) contains the conductive particles.

An image forming apparatus equipped with a conductive rubber-covered roll, wherein the conductive rubber-covered roll comprises a conductive mandrel, and a coating rubber layer formed on the peripheral surface of the mandrel and comprising a vulcanizate of a rubber component (A), a vulcanizate of a rubber component (B) vulcanized by a mechanism different from that in the rubber component (A), and conductive particles, and wherein the vulcanizate of the rubber component (A) is vulcanized with a vulcanizing agent which can not vulcanize the rubber component (B) under the vulcanizing conditions of the rubber (A), and further wherein the vulcanizate of the rubber component (A) is dispersed in the vulcanizate of the rubber component (B), and at least the vulcanizate of the rubber component (B) contains the conductive particles.