| 摘要 |
PURPOSE:To obtain an inexpensive composition, consisting of a polyblend of acrylonitrile-butadiene copolymer with hydrogenated acrylonitrile-butadiene copolymer and a specific amount of sulfur and having excellent abrasion, heat as well as chemical resistance, tensile strength, etc. CONSTITUTION:A rubber composition obtained by blending (A) a polyblend of acrylonitrile-butadiene copolymer (hereinafter referred to as NBR) with hydrogenated acrylonitrile-butadiene copolymer (hereinafter referred to as H-NBR) at preferably 7/3-5/5 (NBR/H-NBR) blending ratio with (B) 2-10pts. wt., preferably 3.5-7pts.wt. sulfur. Since the sulfur has action of promoting covulcanization without selective vulcanization of NBR, abrasion resistance is excellent. The amount of the expensive H-NBR, however, is considered from the harmonic point of the abrasion resistance with economics to select the blending ratio.
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