C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 212/14 (2006.01) B01J 39/20 (2006.01) C08F 220/00 (2006.01) C08F 228/02 (2006.01) C08F 230/00 (2006.01)
Patent
CA 2062481
ABSTRACT Cation-exchange resins are provided which have improved resistance to copolymer degradation caused by oxidizing agents like molecular oxygen. The resins are prepared by functionalizing a plurality of certain cross-linked copolymer beads with cation-exchange groups. The cross-linked copolymer beads are prepared from a para-substituted monovinyl aromatic monomer comprising an aromatic ring substituted with an oxidation-stabilizing moiety in a position para to a polymerizable vinyl moiety. The oxidation-stabilizing moiety is substantially inert during substitution of the copolymer beads with the cation-exchange functional groups, which avoids substitution at the para position. Exemplary of such para-substituted monovinyl aromatic monomers are para-methylstyrene, para-ethylstyrene, and para-chlorostyrene. The cation-exchange resins are capable of being used in a separation process for longer periods of time without detrimental increases in bed pressure drops, loss of operating capacity, and leaching of organic contaminants. 37,528-F
Dhingra Yog R.
Van Tol Paul R.
Smart & Biggar
The Dow Chemical Company
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