C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
C08J 9/00 (2006.01) B01J 41/14 (2006.01) C08F 2/18 (2006.01) C08F 8/00 (2006.01) C08F 257/00 (2006.01) C08F 257/02 (2006.01) C08F 265/00 (2006.01) C08F 265/04 (2006.01) C08J 5/20 (2006.01) C08J 9/28 (2006.01)
Patent
CA 2122028
2122028 9312167 PCTABS00022 The invention concerns preparation of porous copolymer beads by a seeded polymerization process employing gel copolymer seed particles. The process comprises initially providing a plurality of gel-type copolymer seed particles prepared by polymerization of at least one first monovinylidene monomer and a first cross-linking monomer. A second monomer mixture comprising at least one second monovinylidene monomer, a second cross-linking monomer, and a phase-separating diluent is thereafter imbibed by the seed particles and polymerized therein. The process is characterized by selecting the first monovinylidene monomers such that the phase-separating diluent and second monovinylidene monomers are capable of being imbibed by the seed particles in an amount sufficient to form a porous copolymer. The porous copolymer beads produced have stable polymeric structures and good physical properties that render them useful in preparing ion-exchange resins and polymeric adsorbents.
Smart & Biggar
The Dow Chemical Company
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