US4332916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange polymers on improved porous substrates
Assignee: Dow Chemical Co
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Filing: 1972-09-21
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Granted: 1982-06-01
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Expires: 1992-09-21
Abstract
Abstract Increased ion exchange capacity per unit weight of substrate is achieved upon using as the substrate regenerated cellulose sponge instead of cotton fabric. A water soluble crosslinkable polymeric material having ion ion exchange sites, such as polyvinyl phosphate or polyethylenimine, and a suitable crosslinking agent are dissolved in water. The sponge is wetted with the solution and dried and cured at about 100 degrees to 145 degrees C. to crosslink the polymer to the substrate. The so-prepared ion exchange composition is immersed in a flowing stream of dilute aqueous solution of heavy metal ions or otherwise contacted with such solution to effect separation and concentration of such cations.
Inventors
- 👤 Bruce P. Thill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:07
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/20; C22B3/42; B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/22; B01J47/00; B01J47/018; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
44 words
An improved article for concentration of heavy metal ions from dilute aqueous solution which comprises: non-woven regenerated cellulose in the form of a porous sponge with substantially all open cells, having chemically linked therewith a water soluble crosslinkable polymeric material containing cation exchange sites.
Claim 2
Dependent Claim
44 words
An improved article for concentration of heavy metal ions from dilute aqueous solution which comprises: non-woven regenerated cellulose in the form of a porous sponge with substantially all open cells, having chemically linked therewith a water soluble crosslinkable polymeric material containing cation exchange sites.
Claim 3
Dependent Claim
14 words
The article as in claim 1 in which the polymeric material is polyvinyl phosphate.
Claim 4
Dependent Claim
13 words
The article as in claim 1 in which the polymeric material is polyethylenimine.
Claim 5
Independent Claim
122 words
The method of making an article for the concentration and collection of heavy metal ions from dilute aqueous solution which comprises: preparing an aqueous solution of a crosslinkable water soluble polymeric material, having cation exchange capacity, and a crosslinking agent; thoroughly wetting a porous sponge formed of regenerated cellulose with the polymer solution to provide at least 100 percent by weight pickup of the solution based on the dry weight of the sponge; removing from the sponge polymer solution in excess of 100 percent by weight pickup; and drying and curing the impregnated sponge at a temperature and for a time sufficient to link the polymeric material to the sponge but less than that at which substantial decomposition of the sponge occurs.
Claim 6
Independent Claim
122 words
The method of making an article for the concentration and collection of heavy metal ions from dilute aqueous solution which comprises: preparing an aqueous solution of a crosslinkable water soluble polymeric material, having cation exchange capacity, and a crosslinking agent; thoroughly wetting a porous sponge formed of regenerated cellulose with the polymer solution to provide at least 100 percent by weight pickup of the solution based on the dry weight of the sponge; removing from the sponge polymer solution in excess of 100 percent by weight pickup; and drying and curing the impregnated sponge at a temperature and for a time sufficient to link the polymeric material to the sponge but less than that at which substantial decomposition of the sponge occurs.
Claim 7
Dependent Claim
18 words
The method as in claim 4 in which the sponge is wetted by immersion in the polymer solution.
Claim 8
Dependent Claim
35 words
The method as in claim 4 in which the wetted sponge is dried and cured by heating the same at a temperature of about 100 to 145 degrees C. for about 15 to 90 minutes.
Claim 9
Dependent Claim
22 words
The method as in claim 4 in which the crosslinkable water soluble material is polyvinyl phosphate and the crosslinking agent is urea.
Claim 10
Dependent Claim
22 words
The method as in claim 4 in which the crosslinkable water soluble material is polyethylenimine and the crosslinking agent is 2-butenyl-bis[1,4-bis(2-hydroxyethyl)sulfonium chloride].
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-31 | 1985-11-30 | 1986-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-31 | 1989-11-30 | 1990-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-31 | 1993-11-30 | 1994-06-01 | $7700.00 | Window Closed / Lapsed |