Patent EP0244981A2 successfully refreshed from Google Patents.
EP0244981A2
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Soil sealing compositions and methods
Assignee: Ciba Specialty Chemicals Water Treatments Ltd
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Filing: 1987-04-22
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Granted: —
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Expires: 2007-04-22
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
EP
Data Source
google_patents
Last Synchronized
2026-11-09 05:32
CPC Classifications
C; C09; C09K; C09K17/00; C09K17/40; Y; Y10; Y10S; Y10S507/00; Y10S507/935
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
128 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, characterised in that 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 where R³ and R⁴ are each C 1-6 alkyl, substituted aryl, unsubstituted aryl, and C 6-12 aralkyl, R¹ and R² are selected from the same groups as R³ and R⁴ and hydrogen, and R⁵ is hydrogen or C 1-6 alkyl and B) 85 to 10% by weight of least one other ethylenically unsaturated monomer.
Claim 2
Dependent Claim
128 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, characterised in that 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 where R³ and R⁴ are each C 1-6 alkyl, substituted aryl, unsubstituted aryl, and C 6-12 aralkyl, R¹ and R² are selected from the same groups as R³ and R⁴ and hydrogen, and R⁵ is hydrogen or C 1-6 alkyl and B) 85 to 10% by weight of least one other ethylenically unsaturated monomer.
Claim 3
Dependent Claim
15 words
A composition according to claim 1 in which monomer A is 2-acrylamido-2-methyl propane sulphonic acid.
Claim 4
Dependent Claim
25 words
A composition according to claim 1 or claim 2 in which the amount of monomer A is 25 to 70% by weight of the monomers.
Claim 5
Dependent Claim
23 words
A composition according to any preceding claim in which the amount of monomer A is 35 to 70% by weight of the monomers.
Claim 6
Dependent Claim
21 words
A composition according to any preceding claim in which monomer B is selected from ethylenically unsaturated carboxylic acid monomers and acrylamide.
Claim 7
Dependent Claim
41 words
A composition according to any preceding claim 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 8
Dependent Claim
37 words
A composition according to any preceding claim 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 9
Dependent Claim
17 words
A composition according to any preceding claim in which the polymer is a linear water soluble polymer.
Claim 10
Dependent Claim
20 words
A composition according to any preceding claim in which the polymer has a molecular weight of 2 to 10 million.
Claim 11
Independent Claim
140 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, characterised in that the polymer has a molecular weight of at least 500,000 and 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 , where R³ and R⁴ are each C 1-6 alkyl, substituted aryl, unsubstituted aryl, and C 6-12 aralkyl, R¹ and R² are selected from the same groups as R³ and R⁴ and hydrogen, and R⁵ is hydrogen or C 1-6 alkyl and B) 85 to 10% by weight of least one other ethylenically unsaturated monomer.
Claim 12
Independent Claim
140 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, characterised in that the polymer has a molecular weight of at least 500,000 and 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 , where R³ and R⁴ are each C 1-6 alkyl, substituted aryl, unsubstituted aryl, and C 6-12 aralkyl, R¹ and R² are selected from the same groups as R³ and R⁴ and hydrogen, and R⁵ is hydrogen or C 1-6 alkyl and B) 85 to 10% by weight of least one other ethylenically unsaturated monomer.
Claim 13
Dependent Claim
20 words
A method according to claim 10 in which the polymer is as defined in any of claims 1 to 9.
References Cited (Backward Citations)
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