Free flowing particles of an emulsion polymer having SiO.sub.2 incorporated therein
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United States of America Patent
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May 21, 1991
Grant Date -
N/A
app pub date -
Aug 17, 1989
filing date -
Aug 17, 1989
priority date (Note) -
Expired
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Abstract
High amounts of silicon dioxide are readily incorporated into an emulsion polymerized elastomer by mixing an aqueous dispersion of silicon dioxide with a latex of the emulsion polymer and subsequently spray drying the mixture. Free flowing, fine-size (e.g., less than 500 micrometers) particles are produced with generally complete incorporation of silicon dioxide. The presence of the silicon dioxide permits rubbers with low gel and/or low Mooney viscosity to be spray dried whereas previously this could not be accomplished. Compared to conventional means of adding a silica to a bale rubber, the above powdered masterbatch gives shorter mixing times with lower power consumption with improved physical properties, such as tensile strength.
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