Patent ID: 8686055
Filing Date: 2014-04-01
Classification: B01J,C08F,C08L

Abstract:
1. A method for the production improved shell functionalized ion exchange resins comprising: (a) preparing a second stage type tree radical matrix; (b) contacting the second stage type free radical matrix with a monomer feed comprising at least one monomer under conditions such that the second stage type free radical matrix catalyzes a polymerization of the at least one monomer to form copolymer beads having a core/shell morphology, and (c) functionalizing the copolymer bead by halomethylation or sulfonation; wherein the second stage type free radical matrix is prepared by a process comprising (i) suspending a plurality of seed particles in a suspending medium, (ii) imbibing into the seed particles a free radical-containing initial monomer charge, and (iii) polymerizing monomers in the initial monomer charge until the conversion thereof into polymer is 20 to 95 percent, with the proviso that, when the functionalizing the copolymer bead comprises halomethylation, the initial monomer charge comprises at least 14 weight percent crossinking monomer and the monomer feed (b) comprises less than 10 weight percent crosslinking monomer; and with the proviso that, when the functionalizing the copolymer bead comprises sulfonation, the initial monomer charge comprises at lease 16 weight percent crosslinking monomer and the monomer feed (b) comprises less than 16 weight percent crosslinking monomer.