Pulvurent rubber comprising carbon black filler, process for their preparation and application
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United States of America Patent
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Nov 30, 2004
Grant Date -
Jul 31, 2003
app pub date -
Jun 28, 2002
filing date -
Jun 28, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a process for preparing fine-particle free-flowing rubber powders, composed of carbon black fillers and a rubber, prepared by solution polymerization. The process operates on the basis of a two-phase system involving transfer of the organic rubber phase in a non-aggressive manner into the inorganic filler suspension, without addition of chemicals. A rubber/carbon black composite is formed. The process comprises measures to avoid clumping of product in the aqueous phase. After mechanical water removal and thermal drying, the product obtained flows freely and is a storage-stable powder or pellet and are markedly superior to the standard both in their processing and in their rubber-technology property profile.
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