US4085060A
Expired / Lapsed
US
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Sequestering compositions
Assignee: Individual
•
Filing: 1975-09-23
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Granted: 1978-04-18
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Expires: 1995-09-23
Abstract
Abstract Sequestering compositions are described which utilize two water dispersible polymers, the first having pendant carboxy groups and the second containing hydroxy, amino or imino groups within the polymer. The compositions sequester various metals, are inexpensive to prepare and are easily handled and recovered. A representative embodiment is a mixture of polyacrylic acid and polythyleneimine. Additional chelating agents can be present.
Inventors
- 👤 Neiko I. Vassileff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:48
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
64 words
A metal sequestering composition capable of forming a stable aqueous solution and comprising a physical mixture of (a) from 5 to 95% by weight of at least one of a first water soluble polymer selected from the group consisting of polyacrylic acid and acrylic acid-maleic anhydride copolymer and (b) as the balance of said mixture, a second weight water soluble polymer which is polyethyleneimine.
Claim 2
Dependent Claim
64 words
A metal sequestering composition capable of forming a stable aqueous solution and comprising a physical mixture of (a) from 5 to 95% by weight of at least one of a first water soluble polymer selected from the group consisting of polyacrylic acid and acrylic acid-maleic anhydride copolymer and (b) as the balance of said mixture, a second weight water soluble polymer which is polyethyleneimine.
Claim 3
Dependent Claim
24 words
A composition according to claim 1 wherein said mixture contains from about 30 to about 70% by weight of said first water soluble polymer.
Claim 4
Dependent Claim
16 words
A composition according to claim 1 comprising approximately equal amounts of said first and second polymers.
Claim 5
Dependent Claim
10 words
An aqueous solution of a composition according to claim 1.
Claim 6
Dependent Claim
13 words
A composition according to claim 1 wherein said first polymer is polyacrylic acid.
Claim 7
Dependent Claim
10 words
An aqueous solution of a composition according to claim 5.
Claim 8
Dependent Claim
25 words
A composition according to claim 1 wherein approximately equal amounts of said first and second polymers are present, and said first polymer is polyacrylic acid.
Claim 9
Dependent Claim
27 words
An aqueous solution of a composition according to claim 1 sequestering at least one metal selected from the group consisting of copper, calcium, zinc, iron and magnesium.
Claim 10
Dependent Claim
45 words
A composition according to claim 1 including a chelating agent in combination with said mixture, said chelating agent being selected from the group consisting of ethylenediamine tetracetic acid, nitrilotriacetic acid, ethyleneglycol-bis-(β-aminoethyl ether)-N,N-tetracetic acid, diethylenetriamine pentacetic acid, N-hydroxyethylethylenediamine triacetic acid, N,N'-dihydroxyethylglycine, gluconic acid, and heptogluconic acid.
Claim 11
Dependent Claim
10 words
An aqueous solution of a composition according to claim 9.
Claim 12
Dependent Claim
25 words
An aqueous solution of a composition according to claim 9 wherein said first polymer is polyacrylic acid and said chelating agent is ethylenediamine tetracetic acid.
Claim 13
Dependent Claim
24 words
An aqueous solution of a composition according to claim 9 wherein said first polymer is polyacrylic acid and said chelating agent is nitrilotriacetic acid.
Claim 14
Dependent Claim
25 words
An aqueous solution of a composition according to claim 9 wherein said first polymer is polyacrylic acid and said chelating agent is ethyleneglycol-bis-(β-aminoethyl ether)-N,N-tetracetic acid.
Claim 15
Dependent Claim
25 words
An aqueous solution of a composition according to claim 9 wherein said first polymer is polyacrylic acid and said chelating agent is diethylenetriamine pentacetic acid.
Claim 16
Dependent Claim
25 words
An aqueous solution of a composition according to claim 9 wherein said first polymer is polyacrylic acid and said chelating agent is N-hydroxyethylethylenediamine triacetic acid.
Claim 17
Dependent Claim
23 words
An aqueous solution of a composition according to claim 9 wherein said first polymer is polyacrylic acid and said chelating agent is N,N'-dihydroxyethylglycine.
Claim 18
Dependent Claim
24 words
An aqueous solution of a composition according to claim 9 wherein said first polymer is polyacrylic acid and said chelating agent is gluconic acid.
Claim 19
Dependent Claim
24 words
An aqueous solution of a composition according to claim 9 wherein said first polymer is polyacrylic acid and said chelating agent is heptogluconic acid.
Claim 20
Dependent Claim
50 words
A metal sequestering composition capable of forming a stable aqueous solution and comprising a physical mixture of (a) from 5 to 95% by weight of a first water soluble polymer which is polyacrylic acid and (b) as the balance of said mixture, a second water soluble polymer which is polyethyleneoxide.
Claim 21
Dependent Claim
50 words
A metal sequestering composition capable of forming a stable aqueous solution and comprising a physical mixture of (a) from 5 to 95% by weight of a first water soluble polymer which is polyacrylic acid and (b) as the balance of said mixture, a second water soluble polymer which is polyethyleneoxide.
Claim 22
Dependent Claim
18 words
A composition according to claim 19 wherein approximately equal amounts of said first and second polymers are present.
Claim 23
Dependent Claim
24 words
A composition according to claim 19 wherein said mixture contains from about 30 to about 70% by weight of said first water soluble polymer.
Claim 24
Dependent Claim
10 words
An aqueous solution of a composition according to claim 30.
Claim 25
Dependent Claim
47 words
A composition according to claim 19 including a chelating agent in combination with said mixture, said chelating agent being selected from the group consisting of ethylenediamine tetracetic acid, nitrilotriacetic acid, ethyleneglycol bis-(β-aminoethyl ether)-N, N-tetracetic acid, diethylenetriamine pentacetic acid, N-hydroxyethylethylenediamine triacetic acid, N,N'-dihydroxyethylglycine, gluconic acid, and heptogluconic acid.
Claim 26
Dependent Claim
27 words
An aqueous solution of a composition according to claim 19 sequestering at least one metal selected from the group consisting of copper, calcium, zinc, iron and magnesium.
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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) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |