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Grafted methylenediphosphonate ion exchange resins

  • US 5,712,347 A
  • Filed: 04/03/1997
  • Issued: 01/27/1998
  • Est. Priority Date: 02/06/1995
  • Status: Expired due to Term
First Claim
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1. A process for using tetra-C1 -C8 alkyl methylenediphosphonate carbanion to prepare an ion exchange resin comprised of an insoluble cross-linked copolymer containing grafted pendent tetra-C1 -C8 alkyl methylenediphosphonate groups comprising the steps of:

  • (a) forming a reaction mixture by admixing insoluble cross-linked copolymer particles containing about 10 to about 95 mole percent copolymerized vinylbenzyl halide or glycidyl acrylate or methacrylate monomer and a sufficient amount of tetra-C1 -C8 alkyl methylenediphosphonate carbanion in a hydrocarbon solvent to form 1.0 to about 10 mmol/g of said pendent groups,, said particles being sized to pass through a 4 millimeter sieve opening and be retained on a sieve having an opening of about 0.004 millimeters;

    (b) maintaining said reaction mixture at a temperature of about 25°

    to about 250°

    C. for a time period sufficient for an ion exchange resin with said amount of pendent groups to form as product; and

    (c) recovering said product containing pendent tetra-C1 -C8 alkyl methylenediphosphonate groups.

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