| 摘要 |
PROBLEM TO BE SOLVED: To provide a rubber molded product which sufficiently exerts desired functions and retains lubricity, non-sticking property, etc., without deteriorating its productivity and resistance to permanent set in fatigue. SOLUTION: The rubber material composition is obtained by compounding at least an ethylene-α-olefin-nonconjugated polyene copolymer, carbon black, a softener and a silicone compound and is used to form at least the surface side of an abutment site of a rubber molded product. The molded product has a polymer material such as the rubber material compounded therein and is obtained by extrusion molding and vulcanization. A small amount of relatively large-grained carbon black (arithmetic average grain size of≥60 nm, 50-100 phr) is used as the carbon black, and a silicone compound with viscosity (25°C) of≥1,000 cSt is used as the silicone compound. On the rubber molded product comprising the rubber material composition, a carbon-derived uneven surface 10c is formed. COPYRIGHT: (C)2008,JPO&INPIT |
