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| Portable apparatus for holding objects |
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| Shot blasting apparatus |
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| Window unit for use in oven doors |
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| Quick-action bar clamp |
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Soil sealing compositions and methods
| Details |
Inventors: Dymond, Brian;
Assignee: Allied Colloids Ltd. (GB2)
Primary Examiner: Taylor; Dennis L.
Assistant Examiner:
Attorney, Agent or Firm: Ostrolenk, Faber, Gerb & Soffen
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. |
|
DETAILED DESCRIPTION I claim: 1.
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) 15 to 90% by weight of at least one monomer selected from allyl sulphonic acid and monomers of the formula ##STR2## where R.
sup.
3 and R.
sup.
4 are each C.
sub.
1-6 alkyl, substituted aryl, unsubstituted aryl, and C.
sub.
6-12 aralkyl, R.
sup.
1 and R.
sup.
2 are selected from the same groups as R.
sup.
3 and R.
sup.
4 and hydrogen, and R.
sup.
5 is hydrogen or C.
sub.
1-6 alkyl and (B) 85 to 10% by weight of least one other ethylenically unsaturated monomer.
2.
A method according to claim 1 in which monomer A is 2-acrylamido-2-methyl propane sulphonic acid.
3.
A method according to claim 1 in which the amount of monomer A is 25 to 70% by weight of the monomers.
4.
A method according to claim 1 in which the amount of monomer A is 35 to 70% by weight of the monomers.
5.
A method according to claim 1 in which monomer B is selected from ethylenically unsaturated carboxylic acid monomers and acrylamide.
6.
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.
7.
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.
8.
A method according to claim 1 in which the polymer is a linear water soluble polymer.
9.
A method according to claim 1 in which the polymer has a molecular weight of 2 to 10 million.
10.
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
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