Patent US4669920A successfully refreshed from Google Patents.
US4669920A
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US
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Soil sealing compositions and methods
Assignee: Ciba Specialty Chemicals Water Treatments Ltd
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Filing: 1986-07-25
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Granted: 1987-06-02
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Expires: 2006-07-25
Abstract
Abstract A soil sealing composition suitable for reducing the permeability of soil to water contaminated with electrolyte comprises an expanding lattice clay and a water soluble or water swellable polymer having a molecular weight of at least 500,000 and that is a copolymer of 2-acrylamido-2-methyl propane sulphonic acid, or certain other ethylenically unsaturated sulphonic acids, together with other ethylenically unsaturated monomer, preferably a blend of acrylamide and acrylic acid.
Inventors
- 👤 Brian Dymond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:16
CPC Classifications
C; C09; C09K; C09K17/00; C09K17/40; Y; Y10; Y10S; Y10S507/00; Y10S507/935
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
65 words
A method of reducing the permeability of soil to water, the method comprising forming a mixture of the soil, water, an expanding lattice clay, and a water soluble or water swellable polymer in an amount of 0.05 to 10% by weight of the clay and polymer, and in which the polymer has a molecular weight of at least 500,000 and is a copolymer of (A)
Claim 2
Independent Claim
65 words
A method of reducing the permeability of soil to water, the method comprising forming a mixture of the soil, water, an expanding lattice clay, and a water soluble or water swellable polymer in an amount of 0.05 to 10% by weight of the clay and polymer, and in which the polymer has a molecular weight of at least 500,000 and is a copolymer of (A)
Claim 3
Dependent Claim
82 words
15 to 90% by weight of at least one monomer selected from allyl sulphonic acid and monomers of the formula ##STR2## where R 3 and R 4 are each C 1-6 alkyl, substituted aryl, unsubstituted aryl, and C 6-12 aralkyl, R 1 and R 2 are selected from the same groups as R 3 and R 4 and hydrogen, and R 5 is hydrogen or C 1-6 alkyl and (B) 85 to 10% by weight of least one other ethylenically unsaturated monomer.
Claim 4
Dependent Claim
82 words
15 to 90% by weight of at least one monomer selected from allyl sulphonic acid and monomers of the formula ##STR2## where R 3 and R 4 are each C 1-6 alkyl, substituted aryl, unsubstituted aryl, and C 6-12 aralkyl, R 1 and R 2 are selected from the same groups as R 3 and R 4 and hydrogen, and R 5 is hydrogen or C 1-6 alkyl and (B) 85 to 10% by weight of least one other ethylenically unsaturated monomer.
Claim 5
Dependent Claim
15 words
A method according to claim 1 in which monomer A is 2-acrylamido-2-methyl propane sulphonic acid.
Claim 6
Dependent Claim
22 words
A method according to claim 1 in which the amount of monomer A is 25 to 70% by weight of the monomers.
Claim 7
Dependent Claim
22 words
A method according to claim 1 in which the amount of monomer A is 35 to 70% by weight of the monomers.
Claim 8
Dependent Claim
20 words
A method according to claim 1 in which monomer B is selected from ethylenically unsaturated carboxylic acid monomers and acrylamide.
Claim 9
Dependent Claim
40 words
A method according to claim 1 in which monomer B is a blend of 2.5 to 70% acrylic acid or a salt thereof and 10 to 70% acrylamide, the amounts being by weight based on the total weight of monomers.
Claim 10
Dependent Claim
36 words
A method according to claim 1 in which monomer B is a blend of 2.5 to 30% sodium acrylate and 10 to 60% acrylamide, the amounts being by weight based on the total weight of monomers.
Claim 11
Dependent Claim
16 words
A method according to claim 1 in which the polymer is a linear water soluble polymer.
Claim 12
Dependent Claim
19 words
A method according to claim 1 in which the polymer has a molecular weight of 2 to 10 million.
Claim 13
Dependent Claim
136 words
A soil sealing composition comprising an expanding lattice clay and a water soluble or water swellable polymer that has a molecular weight of at least 500,000 and that is present in an amount of 0.05 to 10% by weight of the clay and polymer, and in which the polymer is a copolymer of (A) 15 to 90% by weight of at least one monomer selected from allyl sulphonic acid and monomers of the formula ##STR3## where R 3 and R 4 are each C 1-6 alkyl, substituted aryl, unsubstituted aryl, and C 6-12 aralkyl, R 1 and R 2 are selected from the same groups as R 3 and R 4 and hydrogen, and R 5 is hydrogen or C 1-6 alkyl and (B) 85 to 10% by weight of least one other ethylenically unsaturated monomer.
Claim 14
Dependent Claim
136 words
A soil sealing composition comprising an expanding lattice clay and a water soluble or water swellable polymer that has a molecular weight of at least 500,000 and that is present in an amount of 0.05 to 10% by weight of the clay and polymer, and in which the polymer is a copolymer of (A) 15 to 90% by weight of at least one monomer selected from allyl sulphonic acid and monomers of the formula ##STR3## where R 3 and R 4 are each C 1-6 alkyl, substituted aryl, unsubstituted aryl, and C 6-12 aralkyl, R 1 and R 2 are selected from the same groups as R 3 and R 4 and hydrogen, and R 5 is hydrogen or C 1-6 alkyl and (B) 85 to 10% by weight of least one other ethylenically unsaturated monomer.
Claim 15
Dependent Claim
15 words
A composition according to claim 10 in which monomer A is 2-acrylamido-2-methyl propane sulphonic acid.
Claim 16
Dependent Claim
22 words
A composition according to claim 10 in which the amount of monomer A is 25 to 70% by weight of the monomers.
Claim 17
Dependent Claim
22 words
A composition according to claim 10 in which the amount of monomer A is 35 to 70% by weight of the monomers.
Claim 18
Dependent Claim
20 words
A composition according to claim 10 in which monomer B is selected from ethylenically unsaturated carboxylic acid monomers and acrylamide.
Claim 19
Dependent Claim
40 words
A composition according to claim 10 in which monomer B is a blend of 2.5 to 70% acrylic acid or a salt thereof and 10 to 70% acrylamide, the amounts being by weight based on the total weight of monomers.
Claim 20
Dependent Claim
36 words
A composition according to claim 10 in which monomer B is a blend of 2.5 to 30% sodium acrylate and 10 to 60% acrylamide, the amounts being by weight based on the total weight of monomers.
Claim 21
Dependent Claim
16 words
A composition according to claim 10 in which the polymer is a linear water soluble polymer.
Claim 22
Dependent Claim
19 words
A composition according to claim 10 in which the polymer has a molecular weight of 2 to 10 million.
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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) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |