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Ion exchange/chelation resins containing dense star polymers having ion exchange or chelate capabilities

  • US 4,871,779 A
  • Filed: 12/23/1985
  • Issued: 10/03/1989
  • Est. Priority Date: 12/23/1985
  • Status: Expired due to Term
First Claim
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1. An ion exchange resin comprising a normally solid, water-insoluble substrate having deposited thereon or chemically bonded thereto a dense star polymer in an amount effective to enable the resin to function as an ion exchange resin, said dense star polymer having at least one dendritic branch emanating from a core, each dendritic branch having at least two terminal ion exchange moieties provided that (1) the ratio of terminal groups to the branches emanating from the core is 2:

  • 1 or greater, (2) the density of terminal groups in the dense star polymer is at least 1.5 times that of an extended conventional star polymer having similar core and monomeric moieties and a comparable molecular weight and number of core branches wherein each of such branches of the extended conventional star polymer bears only one terminal group, (3) a molecular volume that is equal to or less than 80 percent of the molecular volume of said extended conventional star polymer, and (4) the two-dimensional molecular diameter of the dense star polymer is in the range from about 12 to about 2000 Angstroms.

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