| 摘要 |
PROBLEM TO BE SOLVED: To obtain a rubber composition having low hardness, containing a specific terpolymer rubber, a specific ethylene-α-olefin-based copolymer rubber, a specific polyoctenemer and a specific organic peroxide at a specific ratio, free from occurrence of outer gas, excellent in kneading processability and suitable for sealing material, etc. SOLUTION: This rubber composition comprises (A) 100 pts.wt. ethylene- propylene-diene terpolymer rubber, (B) 20-100 pts.wt. ethylene-α-olefin copolymer rubber having 10<4> to 10<5> number-average molecular weight, (C) 10-80 pts.wt. polyoctenemer having 10<3> to 10<5> number-average molecular weight and (D) preferably 0.5-8 pts.wt. organic peroxide such as benzoyl peroxide. Furthermore, the rubber composition having low hardness is preferably used as a molding material of a sealing material for magnetic or optical hard disc derives.
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