FOAMED RUBBER COMPOSITION, FOAMED RUBBER, AND CONDUCTIVE RUBBER ROLLER

• Main Author: FUNADA TOSHIAKI
• Format: Patent
• Language: English; Japanese
• Published: 20.05.2024
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; CINEMATOGRAPHY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; GENERAL PROCESSES OF COMPOUNDING; HOLOGRAPHY; MAGNETOGRAPHY; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PHOTOGRAPHY; PHYSICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

To provide a foamed rubber composition in which a fluctuation amount of electrical characteristics caused by an environmental change is suppressed.SOLUTION: A foamed rubber composition includes a rubber constituent, a sulfur crosslinking agent, rubber powder and a foaming agent. The rubber constituent includes EPDM, the content of the EPDM is 2 pts.mass or more and 28 pts.mass or less for 100 pts.mass of the rubber constituent, the rubber powder is obtained by pulverizing non-foamed rubber molded body, volume electric resistivity of the non-foamed rubber molded body at temperature 23°C and relative humidity 50% is within the range of 106.5 Ω cm or less, a particle size (D50) of the rubber powder is 800 μm or less, and the content of the rubber powder is 55 pts.mass or less for 100 pts.mass of the rubber constituent.SELECTED DRAWING: None 【課題】環境変化による電気的特性の変動量を抑制した発泡ゴム組成物を提供する。【解決手段】ゴム成分と、硫黄架橋剤と、ゴム粉末と、発泡剤と、を含む発泡ゴム組成物である。前記ゴム成分は、ＥＰＤＭを含み、前記ＥＰＤＭの含有量は、前記ゴム成分１００質量部に対して２質量部以上２８質量部以下であり、前記ゴム粉末は、非発泡のゴム成形体を粉砕して得られ、前記非発泡ゴム成形体の温度２３℃で相対湿度５０％における体積電気抵抗率が、１０６．５Ω・ｃｍ以下の範囲にあり、前記ゴム粉末の粒度（Ｄ５０）は、８００μｍ以下であり、前記ゴム粉末の含有量は、前記ゴム成分１００質量部に対して５５質量部以下である。【選択図】なし