abstract |
It contains α, β-ethylenically unsaturated monocarboxylic acid ester monomer units in a proportion of 26 to 50% by weight, has an iodine value of 120 or less, and has a total content of sodium, calcium, and magnesium of 1000 parts by weight ppm. Hereinafter, a carboxyl group-containing nitrile rubber having a chloride ion content of 50 to 500 ppm by weight is provided. |