RUBBER COMPOSITION, RUBBER ROLLER AND IMAGE FORMING APPARATUS

• Main Authors: TANIO YUSUKE, OSAKA KEISUKE
• Format: Patent
• Language: English; Japanese
• Published: 01.08.2019
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BEARINGS; BLASTING; CHEMISTRY; CINEMATOGRAPHY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINEERING ELEMENTS AND UNITS; FLEXIBLE SHAFTS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; GENERAL PROCESSES OF COMPOUNDING; HEATING; HOLOGRAPHY; LIGHTING; MAGNETOGRAPHY; MECHANICAL ENGINEERING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PHOTOGRAPHY; PHYSICS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SHAFTS; THEIR PREPARATION OR CHEMICAL WORKING-UP; THERMAL INSULATION IN GENERAL; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WEAPONS; WORKING-UP

To provide a rubber composition which has small average cell diameter and furthermore has low rubber hardness and is soft, and allows for formation of a foam such as a roller body, and to provide a rubber roller including a cylindrical roller body composed of a foam obtained by foaming the rubber composition and crosslinking the same, and an image forming apparatus including the rubber roller.SOLUTION: The rubber composition includes NBR having a Mooney viscosity of 15-50, and epichlorohydrin rubber having a Mooney viscosity of 5-35 each at a ratio of 10 pts.mass or more, in a total amount of 100 pts.mass of the rubber, and further includes 10 pts.mass or lower of a carbon black and 7 pts.mass or lower of a foaming agent in total amount of 100 pts.mass of the rubber, and the rubber composition has a Mooney viscosity of 35 or lower. A rubber roller 1 includes a roller body 2 formed by extrusion-molding the rubber composition into a cylindrical shape, foaming and crosslinking the extrusion-molded rubber composition. The image forming apparatus includes the rubber roller 1.SELECTED DRAWING: Figure 1 【課題】平均セル径が小さい上、ゴム硬さが低く柔らかい、ローラ本体等の発泡体を形成できるゴム組成物、当該ゴム組成物を発泡、架橋させた発泡体からなる筒状のローラ本体を含むゴムローラ、および当該ゴムローラを含む画像形成装置を提供する。【解決手段】ゴム組成物は、ムーニー粘度が１５〜５０のＮＢＲと、５〜３５であるエピクロルヒドリンゴムとを、それぞれ、ゴムの総量１００質量部中、１０質量部以上の割合で含み、かつゴムの総量１００質量部あたり、１０質量部以下のカーボンブラックと、７質量部以下の発泡剤とを含み、ムーニー粘度が３５以下である。ゴムローラ１は、上記ゴム組成物を筒状に押出成形し、発泡、架橋させて形成したローラ本体２を含む。画像形成装置は、上記ゴムローラ１を含む。【選択図】図１