Abstract: Disclosed herein is a new monomer as represented by the following formula (1): ##STR1## wherein R.sub.1 is hydrogen or a C.sub.1-10 hydrocarbon group, particularly a hydrogen atom, a methyl group or an ethyl group; and X.sub.1 and X.sub.2 are halogen atoms, particularly bromine atoms.This new monomer is produced by reacting divinylbenzene or a substituted product thereof with a halogenating agent in which halogen molecules are inactivated, or halogen molecule under specific reaction conditions.Also disclosed herein is a linear or crosslinked polymer produced from the monomer, as well as method of producing such polymers. The polymers are very useful in the preparation of functional polymers such as those having a chelating ability.

Abstract: By the displacement chromatographic process comprising passing a solution containing a plurality of metallic elements to be separated through a column packed with activated chelating resin, passing an eluent through the column and collecting successive portions of the resultant eluate, the metallic elements can be separated into individual metallic elements not only in a high state of purity but also in a high state of concentration, with a greatly improved column efficiency.