NITRILE RUBBER COMPOSITION, CROSSLINKABLE RUBBER COMPOSITION, AND CROSSLINKED RUBBER PRODUCT

摘要

A nitrile rubber composition containing a carboxyl group-containing nitrile rubber with an iodine value of 120 or less (A) and bituminous coal (B) is provided. The bituminous coal (B) has a carbon purity of preferably 60 to 95 wt% and further has a volume average particle size of preferably 2 to 10 µm. According to the present invention, it is possible to provide a nitrile rubber composition which can give a cross-linked rubber which is excellent in normal physical properties and further is superior in compression set resistance and oil resistance (in particular, oil resistance to lubricating oil and fuel oil).