| http://www.w3.org/ns/prov#value | - Representative examples of materials advantageously employed as the solid, inert material herein are copolymers, in spheroidal bead form, of a monovinylidene aromatic such as styrene, a cross-linking agent therefor (e.g., a polyethylenically unsaturated monomer, preferably a polyvinylidene aromatic such as divinylbenzene) and a comonomer such as a halo-substituted ethylenically unsaturated monomer
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