Patent US3696622A successfully refreshed from Google Patents.
US3696622A
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A method of soil stabilization and leakage prevention
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1971-02-17
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Granted: 1972-10-10
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Expires: 1991-02-17
Abstract
Abstract An improved method of soil stabilization and leakage prevention characterized by using a resin composition which comprises a water soluble strongly alkaline liquid phenol formaldehyde resin with a pH of 9.5 or more and having a molar ratio of phenol to formaldehyde between 1:1.5 and 1:3.0, and a lactone which is added in a proportion of 1 to 30 percent of the liquid resin, in which a compound such as urea, a urea derivative, a basic or neutral salt is used as a gelation control agent.
Inventors
- 👤 Wataru Tohma
- 👤 Takao Murata
- 👤 Nobutaka Nakamura
- 👤 Atsushi Kudo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:40
CPC Classifications
C; C09; C09K; C09K17/00; C09K17/14; C09K17/18; C09K17/24; C09K17/26; C08; C08K; C08K5/00; C08K5/0008
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
97 words
In the method of soil stabilization and leakage prevention comprising introducing into the formation to be treated a composition comprising a water soluble strongly alkaline liquid phenol-formaldehyde resin having a pH of at least 9.5 and having a molar ratio of pheNol to formaldehyde between 1:1.5 and 1:3.0, and a lactone which is employed in a proportion of 1 to 30 percent of the liquid resin, the improvement comprising incorporating in said composition a gelation time control agent selected from the group consisting of urea, urea derivatives, acetonitrile, water soluble basic salts and water soluble neutral salts.
Claim 2
Dependent Claim
97 words
In the method of soil stabilization and leakage prevention comprising introducing into the formation to be treated a composition comprising a water soluble strongly alkaline liquid phenol-formaldehyde resin having a pH of at least 9.5 and having a molar ratio of pheNol to formaldehyde between 1:1.5 and 1:3.0, and a lactone which is employed in a proportion of 1 to 30 percent of the liquid resin, the improvement comprising incorporating in said composition a gelation time control agent selected from the group consisting of urea, urea derivatives, acetonitrile, water soluble basic salts and water soluble neutral salts.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein sodium acetate is employed in said composition as a gelation accelerator.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein urea is employed in said composition as a gelation retarder.
Claim 5
Dependent Claim
35 words
The method of claim 1 wherein a part of the phenol in the phenol-formaldehyde resin is replaced by a compound selected from the group consisting of urea, melamine, dicyandiamide, lignin, cresols, catechol, resorcinol, and guanamines.
Claim 6
Dependent Claim
11 words
The method of claim 4 wherein the replacement compound is urea.
Claim 7
Dependent Claim
17 words
The method of claim 5 wherein sodium succinate is employed in said composition as a gelation accelerator.
References Cited (Backward Citations)
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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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |