Process for producing rubber composition and rubber composition
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United States of America Patent
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Sep 16, 2003
Grant Date -
Oct 18, 2001
app pub date -
Mar 15, 2001
filing date -
Mar 16, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A rubber composition containing (A) an ethylene-.alpha.-olefin based copolymer rubber having an intrinsic viscosity [.eta.] of 2.0-10.0 as determined in xylene at 70.degree. C., (B) a softening agent, and (C) a filler, which composition is superior in heat resistance and fatigue resistance, is obtained by a process including the steps of dividing component (A) into portions (A1) and (A2), dividing component (B) into portions (B1) and (B2), dividing component (C) into portions (C1) and (C2), kneading portions (A1), (B1) and (C1) together to obtain a first blend, adding portions (A2), (B2) and (C2) to the first blend to obtain a second blend and kneading the second blend to obtain the rubber composition.
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