Water absorbing polymer
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United States of America Patent
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Jun 4, 2002
Grant Date -
Apr 4, 2002
app pub date -
Dec 21, 2000
filing date -
Jun 6, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for producing a substantially dry polymer particle powder. A mixture of polymerization reagents is formed from a mixture of at least one monomer source and a solvent selected from the group consisting essentially of water and organic solvents and an initiator source. The mixture of polymerization reagents is sprayed into a heated, controlled atmosphere, forming droplets of the mixture which are allowed to fall through the heated, controlled atmosphere for a sufficient period of time to obtain a desired degree of polymerization. The solvent is continuously evacuated from the atmosphere during the polymerization process.
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