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AssigneeAsahi Kasei Kogyo Kabushiki Kaisha
InventorsYamaguchi Naomi, Noguchi Kohji, Tsuzura Kazuo
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A porous cross-linked copolymer of chloromethylstyrene and divinylbenzene having a divinylbenzene unit represented by Xm of from about 9.0 percent by mole to about 17.0 percent by mole based on the total moles of monomer units; a content of active chlorine atom of from about 5.25-0.08 Xm mmole/g-dry resin to about 6.43-0.10 Xm mmole/g-dry resin; a water regain of from about 0.10 ml/g-dry resin to about 1.20 ml/g-dry resin; and a total volume of micro pores having a diameter of from about 500 angstroms to about 3000 angstroms of from 0.10 ml/g-dry resin to about 1.20 ml/g-dry resin; and a porous iminodiacetic acid type chelating resin having a Xm of from about 9.0 percent by mole to about 17.0 percent by mole based on the total moles of all monomer units; an ion exchange capacity of from about 5.35-12.0 Xm/(205.6-1.30 Xm) meq/g-dry resin to about 7.93-18.1 Xm/(247.1-2.0 Xm) meq/g-dry resin; a water regain of from about 0.60 ml/g-dry resin to about 2.20 ml/g-dry resin; and the total volume of micro pores having a diameter of from about 500 angstroms to about 3000 angstroms of from about 0.05 ml/g-dry resin to about 0.60 ml/g-dry resin.
A method of producing a porous cross-linked copolymer of chloromethylstyrene and divinylbenzene consisting essentially of polymerizing a monomer mixture containing about 9.0 percent by mole to about 17.0 percent by mole, based on the total moles of all the monomers, of divinylbenzene represented by Xm, about 80-1.39 Xm percent mole to about 98-1.71 Xm percent by mole, based on the total moles of all the monomers, of chloromethylstyrene, about 50 percent by weight to about 120 percent by weight, based on the total weight of all the monomers, of a water-insoluble organic medium selected from the group consisting of dioctyl phthalate, dibutyl sebacate, dibutyl azelate, dibutyl adipate, tributyl citrate, dihexyl sebacate, dihexyl azelate, dihexyl adipate, dioctyl sebacate, dioctyl azelate and dioctyl adipate, about 1 percent by weight to about 7.5 percent by weight, based on the total weight of all the monomers, of a linear polymer which is soluble in the monomers and the water-insoluble organic medium, the linear polymer being selected from the group consisting of polystyrene, polymethyl methacrylate and polyvinyl acetate, and removing unreacted components from the polymerized product.
A method of producing a porous iminodiacetic acid type chelating resin comprising reacting a porous cross-linked copolymer of chloromethylstyrene and divinylbenzene having a divinylbenzene unit represented by Xm of from about 9.0 percent by mole to about 17.0 percent by mole based on the total moles of all the monomer units, a content of active chlorine atom of from about 5.25-0.08 Xm mmole/g-dry resin to about 6.43-0.10 Xm mmole/g-dry resin, a water regain of from about 0.10 ml/g-dry resin to about 1.20 ml/g-dry resin and a total volume of micro pores having a diameter of from about 500 angstroms to about 3000 angstroms of from about 0.10 ml/g-dry resin to about 1.20 ml/g-dry resin with an ester of iminodiacetic acid in an aqueous medium and then hydrolyzing the reaction product.
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