Drying process
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United States of America Patent
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-
Dec 4, 1990
Grant Date -
N/A
app pub date -
Apr 22, 1988
filing date -
May 21, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
When it has been attempted to dry wet polymeric particles in hot air at up to 100.degree. C. it has tended to produce discoloration in the product, introduce aggregates into the product, reduce the dispersibility of the product and reduce the integrity of the surface of the particles. A process of drying has now been developed which comprises heating to an elevated temperature the wet particles in an atomsphere substantially free of oxygen gas so that substantially all of the moisture is removed from association with said particles and under such conditions of time and temperature that any substantial deterioration of said particles is minimized. Preferably the atmosphere is of nitrogen.
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