NITRILE RUBBER COMPOSITION, CROSS-LINKABLE RUBBER COMPOSITION, AND CROSS-LINKED RUBBER
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United States of America Patent
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Mar 31, 2016
app pub date -
Apr 25, 2014
filing date -
Apr 26, 2013
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Abstract
A nitrile rubber composition contains a carboxyl group-containing nitrile rubber with an iodine value of 120 or less (A) and bituminous coal (B). 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. 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).
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