NITRILE RUBBER COMPOSITION AND CROSS-LINKED RUBBER
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United States of America Patent
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Mar 11, 2016
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Mar 13, 2015
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Abstract
A nitrile rubber composition comprising a carboxyl group-containing highly saturated nitrile rubber containing α,β-ethylenically unsaturated nitrile monomer units in a ratio of 5 to 60 wt % and having an iodine value of 120 or less, carbon black, and a polyamine-based cross-linking agent, wherein a content of the carbon black is 100 parts by weight or more and less than 200 parts by weight with respect to 100 parts by weight of the carboxyl group-containing highly saturated nitrile rubber. Accordingly a nitrile rubber composition able to give a cross-linked rubber with excellent in original state physical properties, compression set resistance, and sour gasoline resistance and small in tension set is provided.
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