| abstract |
PROBLEM TO BE SOLVED: To provide a rubber cross-linked product which has rancidity gasoline resistance and is excellent in oil resistance such that it does not cure even in oil containing a condensed aromatic compound. SOLUTION: 1,3-butadiene unit (a) 0 to 20 % By weight, saturated 1,3-butadiene unit (b) 0 to 50 %, Α, β-ethylenically unsaturated nitrile monomer unit (c) 40 to 50% by weight and other monomer unit (d) 10 to 35% by weight and 8 mol% or more, A nitrile group-containing highly saturated copolymer rubber having a total content ratio of the monomer units (a) and (b) of 20 to 50% by weight is blended with a crosslinking agent and subjected to a crosslinking treatment to perform crosslinking. Get things. |