MAGNETIC RUBBER COMPOSITION, MAGNETIC RUBBER MOLDED ARTICLE, MAGNETIC ENCODER AND MANUFACTURING METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a magnetic rubber molded article having both of extremely excellent magnetic property and good mechanical properties by vulcanizing a magnetic rubber composition excellent in flowability while containing a magnetic powder at extremely high concentration.SOLUTION: There is provided a magnetic rubber composition containing a hydrogenated nitrile rubber (A), a magnetic ferrite powder (B), a vulcanizer (C) and stearic acid (D) with Mooney viscosity (ML, 100°C) of the hydrogenated nitrile rubber (A) of 45 to 80, containing the magnetic ferrite powder (B) of 1250 to 1600 pts.mass, the vulcanizer (C) of 0.1 to 4 pts.mass and the stearic acid (D) of 2.5 to 8 pts.mass based on 100 pts.mass of the hydrogenated nitrile rubber and having percentage content of the magnetic ferrite powder (B) to mass of whole magnetic rubber composition of 91 to 93 mass%.SELECTED DRAWING: None