Processes for preparing rubber blend compositions
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United States of America Patent
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Jun 26, 2012
Grant Date -
Jul 22, 2010
app pub date -
May 1, 2008
filing date -
May 2, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
Processes for mixing a filler with a rubber blend containing at least one isoprene elastomer and one butadiene elastomer are provided. Preferably, the processes include the steps of: combining elastomers or a blend of elastomers, a carbon black and/or silica filler(s) and a quinone diimine antidegradant in a rubber composition; mixing the rubber composition for a viscosity-reducing effective period of time to reduce the viscosity of the composition; and discharging the mixed composition. The compositions are preferably discharged from the mixing vessel at or near a minimum viscosity occurring at a temperature of about 120-160° C.
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