US4249949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods for consolidating radioactive waste material using self-setting or water-settable compositions containing an organic polyisocyanate, a non-ionic surface active agent devoid of isocyanate-reactive groups and alkaline filler
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1979-05-14
•
Granted: 1981-02-10
•
Expires: 1999-05-14
Abstract
Abstract Self-setting compositions are formed by bringing into admixture an organic polyisocyanate, a non-ionic surface active agent devoid of isocyanate-reactive groups, an alkaline filler and water. Preferred alkaline fillers are portland cement, calcium oxide and hydrated lime. A plasticizer is preferably incorporated in the composition. Waste material, for example liquid or particulate radioactive wastes may be formed into a self-setting composition for consolidation and disposal. A particulate extender may be incorporated in the self-setting composition to give a product useful for example as a floor screed or cavity filler.
Inventors
- 👤 Alan M. Wooler
- 👤 Olle Bengtson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:57
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/28; G21F9/30; G21F9/301; G21F9/307; C; C02; C02F; C02F11/00; C02F11/008; C04; C04B; C04B28/00; C04B28/02; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/30; C08G18/302; C08K; C08K3/00; C08K3/01; C08K3/013; G21F9/04; G21F9/06; G21F9/16; G21F9/167; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
39 words
A method of consolidating a radioactive waste material which comprises bringing the radioactive waste material into admixture with an organic polyisocyanate; a non-ionic surface active agent devoid of isocyanate-reactive groups; and an alkaline filler in the presence of water.
Claim 2
Independent Claim
39 words
A method of consolidating a radioactive waste material which comprises bringing the radioactive waste material into admixture with an organic polyisocyanate; a non-ionic surface active agent devoid of isocyanate-reactive groups; and an alkaline filler in the presence of water.
Claim 3
Dependent Claim
15 words
A method according to claim 1 wherein the waste material is a wet particulate waste.
Claim 4
Dependent Claim
15 words
A method according to claim 1 wherein the waste material is a liquid aqueous waste.
Claim 5
Dependent Claim
18 words
A method according to claim 1 wherein the alkaline filler is portland cement, calcium oxide, or hydrated lime.
Claim 6
Dependent Claim
13 words
A method according to claim 1 wherein there is additionally incorporated a plasticiser.
Claim 7
Dependent Claim
14 words
A method according to claim 1 wherein there is additionally incorporated a particulate extender.
Claim 8
Dependent Claim
18 words
A method according to claim 1 wherein the organic polyisocyanate is crude MDI or an isocyanate-ended prepolymer thereof.
Claim 9
Dependent Claim
66 words
A method according to claim 1 wherein the non-ionic surface active agent has the formula: RO(CH.sub.2 CH.sub.2 O).sub.n CONHX wherein R is an alkyl group of from 1 to 4 carbon atoms; n is an integer such that the compound contains an average of from 5 to 120 oxyethylene groups; and X is the residue of a polyisocyanate and contains at least one free isocyanate group.
References Cited (Backward Citations)
US2902388A
Cited
US2954301A
Cited
GB1342063A
Cited
US4127548A
Cited
GB1417618A
Cited
GB1444933A
Cited
GB1488020A
Cited
US3977889A
Cited
US3996154A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |