Patent US3715339A successfully refreshed from Google Patents.
US3715339A
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Chelation polymer from nitrilo compound and ethyleneimine compound
Assignee: SEEKAY CHEM CO Inc
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Filing: 1970-12-09
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Granted: 1973-02-06
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Expires: 1990-12-09
Abstract
Abstract A water-insoluble polymer is produced by reacting, under amideforming conditions, a nitrilo compound selected from the group consisting of nitrilotriacetic acid, salts of nitrilotriacetic acid, and lower alkyl esters and amides of nitrilotriacetic acid, with a water soluble ethylene imine compound comprised of at least 80 percent by weight of recurring units of the formula NHCH2CH2-. The water-insoluble polymer has the ability to absorb polyvalent metal ions from dilute aqueous solutions.
Inventors
- 👤 N Rainer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:05
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/0233; B; B01; B01J; B01J45/00; C08G69/00; C08G69/02; C08G69/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
82 words
A water insoluble polymer consisting essentially of the polymeric product produced by the reaction, under amide-forming conditions, of a nitrilo compound selected from the group consisting of nitrilotriacetic acid and the salts and lower alkyl esters and amides of nitrilotriacetic acid, with a water soluble ethylene imine compound consisting essentially of at least about 80 percent by weight of recurring units of the formula -NHCH2CH2-, the ratio of moles of nitrilo compound to moles of -NHCH2CH2-units being between about 0.1 and 1.0.
Claim 2
Dependent Claim
82 words
A water insoluble polymer consisting essentially of the polymeric product produced by the reaction, under amide-forming conditions, of a nitrilo compound selected from the group consisting of nitrilotriacetic acid and the salts and lower alkyl esters and amides of nitrilotriacetic acid, with a water soluble ethylene imine compound consisting essentially of at least about 80 percent by weight of recurring units of the formula -NHCH2CH2-, the ratio of moles of nitrilo compound to moles of -NHCH2CH2-units being between about 0.1 and 1.0.
Claim 3
Dependent Claim
12 words
The polymer of claim 1 wherein the nitrilo compound is nitrilotriacetic acid.
Claim 4
Dependent Claim
17 words
The polymer of claim 1 in a granular form capable of forming a fluid-permeable aggregate of granules.
Claim 5
Dependent Claim
20 words
The polymer of claim 1 wherein the ethylene imine compound contains at least four recurring units of the formula -NHCH2CH2-.
Claim 6
Dependent Claim
23 words
The polymer of claim 1 having a water absorption capacity between about 100 and 600 percent of the dry weight of the polymer.
Claim 7
Dependent Claim
28 words
The polymer of claim 1 having an absorption capacity for divalent metal ions of between about 0.3 and 4.0 millimoles of metal ion per gram of dry polymer.
Claim 8
Dependent Claim
15 words
The polymer of claim 1 in the form of its alkali metal or ammonium salt.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |