Grafted methylenediphosphonate ion exchange resins
First Claim
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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Abstract
An ion exchange resin is disclosed that is comprised of an insoluble copolymer onto which are grafted pendent groups that provide 1.0 to about 10 mmol/g dry weight phosphorous. The pendent groups have the formula ##STR1## wherein R is hydrogen, a cation or mixtures thereof; and R1 is hydrogen or an C1 -C2 alkyl group. The resin also contains zero to about 5 mmol/g dry weight of pendent aromatic sulfonate groups. Processes for making and using an ion exchange-resin are also disclosed.
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Citations
11 Claims
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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:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An aqueous composition comprising in admixture,
(a) water-having a pH value of about 1 or less, (b) a plurality of ion exchange resin particles, 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, said resin comprising an insoluble copolymer onto which are grafted pendent groups that provide phosphorous at 1.0 to about 10 mmol/g dry weight, said pendent groups having the formula ##STR6## wherein R is hydrogen, a cation or mixtures thereof; - and R1 is hydrogen or an C1 -C2 alkyl group;
said resin also containing zero to about 5 mmol/g dry weight of pendent aromatic sulfonate groups, said mmol/g values based on said polymer where R is hydrogen; and (c) a plurality of cations that include at least one polyvalent cation having an atomic number of 90 or more. - View Dependent Claims (10, 11)
- and R1 is hydrogen or an C1 -C2 alkyl group;
Specification