Abstract: Disclosed is a polyamine curable, highly saturated nitrile rubber composition having excellent cold resistance in the presence of a polycyclic aromatic compound; the composition comprising 100 parts by weight of a polyamine curable, highly saturated nitrile rubber having an ?,?-ethylenically unsaturated nitrile monomer unit, a diene-based monomer unit, an ?,?-ethylenically unsaturated dicarboxylic acid monoester monomer unit, and an ?,?-ethylenically unsaturated carboxylic acid ester monomer unit other than the ?,?-ethylenically unsaturated dicarboxylic acid monoester monomer unit, and having an ?,?-ethylenically unsaturated nitrile monomer unit content of 21.0 to 23.0 wt. %, preferably 21.0 to 22.5 wt. %, more preferably 21.0 to 22.0 wt. %, and an iodine value of 120 or less, and 4 to 31 parts by weight of an aliphatic carboxylic acid diester compound of polyalkylene glycol.

Abstract: A polyamine curable, highly saturated nitrile rubber composition comprising 100 parts by weight of a polyamine curable, highly saturated nitrile rubber having an ?,?-ethylenically unsaturated nitrile monomer unit, a diene-based monomer unit, an ?,?-ethylenically unsaturated dicarboxylic acid monoester monomer unit, and an ?,?-ethylenically unsaturated carboxylic acid ester monomer unit other than the ?,?-ethylenically unsaturated dicarboxylic acid monoester monomer unit, and having an ?,?-ethylenically unsaturated nitrile monomer unit content of 22.0 to 24.5 wt. %, preferably 22.5 to 24.5 wt. %, and an iodine value of 120 or less, and 4 to 31 parts by weight of an aliphatic carboxylic acid diester compound of polyalkylene glycol. The polyamine curable, highly saturated nitrile rubber composition is used as a cure molding material of a sealing material that can be suitably used even in an environment in which the sealing material is exposed to polycyclic aromatic compound.

Abstract: An object is to provide an NBR composition excellent in cold resistance and heat resistance, which can be used with a wide range of temperatures, and an NBR composition excellent in oil resistance without substantially degrading compression set characteristics, and the object can be solved by an NBR composition comprising an NBR polymer, silica, an ether ester series plasticizer and a cross-linking agent, which comprises 100 parts by weight of the NBR polymer where an acrylonitrile content of the NBR polymer is within the range of 20 to 40%, 10 to 150 parts by weight of silica a primary particle size of which is within the range of 50 nm or bigger, and 3 to 20 parts by weight of an ether ester plasticizer a weight average molecular weight MW of which is 500 or more.

Abstract: Disclosed is a polyamine curable, highly saturated nitrile rubber composition having excellent cold resistance in the presence of a polycyclic aromatic compound; the composition comprising 100 parts by weight of a polyamine curable, highly saturated nitrile rubber having an ?,?-ethylenically unsaturated nitrile monomer unit, a diene-based monomer unit, an ?,?-ethylenically unsaturated dicarboxylic acid monoester monomer unit, and an ?,?-ethylenically unsaturated carboxylic acid ester monomer unit other than the ?,?-ethylenically unsaturated dicarboxylic acid monoester monomer unit, and having an ?,?-ethylenically unsaturated nitrile monomer unit content of 21.0 to 23.0 wt. %, preferably 21.0 to 22.5 wt. %, more preferably 21.0 to 22.0 wt. %, and an iodine value of 120 or less, and 4 to 31 parts by weight of an aliphatic carboxylic acid diester compound of polyalkylene glycol.

Abstract: A polyamine curable, highly saturated nitrile rubber composition comprising 100 parts by weight of a polyamine curable, highly saturated nitrile rubber having an ?,?-ethylenically unsaturated nitrile monomer unit, a diene-based monomer unit, an ?,?-ethylenically unsaturated dicarboxylic acid monoester monomer unit, and an ?,?-ethylenically unsaturated carboxylic acid ester monomer unit other than the ?,?-ethylenically unsaturated dicarboxylic acid monoester monomer unit, and having an ?,?-ethylenically unsaturated nitrile monomer unit content of 22.0 to 24.5 wt. %, preferably 22.5 to 24.5 wt. %, and an iodine value of 120 or less, and 4 to 31 parts by weight of an aliphatic carboxylic acid diester compound of polyalkylene glycol. The polyamine curable, highly saturated nitrile rubber composition is used as a cure molding material of a sealing material that can be suitably used even in an environment in which the sealing material is exposed to polycyclic aromatic compound.