PROCESS TO PREPARE ADDITIVE PACKAGES FOR USE IN PVC COMPOUNDING
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United States of America Patent
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Issued Date -
Jan 3, 2013
app pub date -
Jun 27, 2012
filing date -
Jun 30, 2011
priority date (Note) -
Abandoned
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Abstract
A process for preparing a one-pack additive package for use in PVC compounding includes the steps of absorbing liquid additives, if any, into a nucleus; blending the nucleus with solid lubricant(s); then blending optional solid additives and optional drying agents therewith to obtain a free-flowing, dry blend, particulate one-pack. The resulting layered dry blend composition may then be pelletized, if desired. Because liquids are absorbed into the nucleus and then the temperature is maintained, during and after the lubricant blending step, at least 5° C. below the melt temperature of the lowest melting lubricant wax, no free liquids are present and potential interactions between additives are avoided.
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