Method for preparing polymeric beads
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United States of America Patent
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Sep 28, 1999
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app pub date -
Jul 7, 1997
filing date -
Jul 7, 1997
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Abstract
A method of forming polymer beads comprising forming an aqueous solution comprising a cross-linkable water soluble polymer and a water-soluble crosslinking agent, adding said solution with mixing to a thixotropic oil gel comprising an oil in which said polymer is insoluble and a silica or silicate, continuing said mixing for a time sufficient and under conditions sufficient to form a water-in-oil dispersion having individual water/polymer droplets dispersed in said thixotropic oil gel, stopping mixing, and when the droplets are in the form of solid beads recovering the beads from the thixotropic oil gel.
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