US4764305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the conditioning of radioactive or toxic waste in epoxy resins and polymerizable mixture with two liquid constituents usable in this process
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1986-01-29
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Granted: 1988-08-16
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Expires: 2006-01-29
Abstract
Abstract The invention relates to a process for the conditioning of radioactive or toxic waste in epoxy resins and a polymerizable mixture with two liquid constituents usable in this process. This process consists of incorporating the waste into a polymerizable mixture incorporating at least one epoxy resin, pitch and at least one epoxy resin hardener and allowing the thus obtained mixture to harden. Generally the mixture comprises at least 50% by pitch weight and can be used for treating radioactive waste constituted by large objects and organic liquids.
Inventors
- 👤 Christian de Tassigny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:51
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/28; G21F9/30; G21F9/301; G21F9/307
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
63 words
A process for the conditioning of radioactive or toxic waste, which comprises incorporating said waste into a polymerizable mixture consisting essentially of 30 to 45% by wt. epoxy resin, 30 to 50% by wt. pitch and 20 to 25% epoxy resin hardener, and allowing the mixture to harden to obtain a solid block, said polymerizable mixture being filler-free and miscible with organic liquids.
Claim 2
Dependent Claim
63 words
A process for the conditioning of radioactive or toxic waste, which comprises incorporating said waste into a polymerizable mixture consisting essentially of 30 to 45% by wt. epoxy resin, 30 to 50% by wt. pitch and 20 to 25% epoxy resin hardener, and allowing the mixture to harden to obtain a solid block, said polymerizable mixture being filler-free and miscible with organic liquids.
Claim 3
Dependent Claim
17 words
A process according to claim 1, wherein the mixture comprises between 30 and 40% by weight pitch.
Claim 4
Dependent Claim
25 words
A process according to claim 1, wherein the pitch is a coal pitch obtained from treatment of tars having a low content of insoluble products.
Claim 5
Dependent Claim
59 words
A process according to claim 1, wherein use is made of a first liquid constituent comprising pitch and hardener and a second liquid constituent based on epoxy resin, wherein the two liquid constituents are mixed with the waste so as to obtain a homogeneous mixture and wherein the mixture is then allowed to harden to obtain a solid block.
Claim 6
Dependent Claim
17 words
A process according to claim 4, wherein the mixture is hardened at between 20° and 60° C.
Claim 7
Dependent Claim
14 words
A process according to claim 1, wherein the waste is constituted by large objects.
Claim 8
Dependent Claim
14 words
A process according to claim 1, wherein the waste is constituted by organic liquids.
Claim 9
Dependent Claim
21 words
A process according to claim 7, wherein the organic liquids are chosen from among drainage oils, organic solvents and scintillation liquids.
Claim 10
Dependent Claim
35 words
A process according to claim 1, wherein around the solid block is formed a protective barrier produced from a polymerizable mixture incorporating at least one epoxy resin, pitch and at least one epoxy resin hardener.
Claim 11
Dependent Claim
70 words
A process according to claim 1, wherein the waste and the polymerizable mixture incorporating at least one epoxy resin, pitch and at least one epoxy resin hardener are introduced into a cylindrical barrel obtained by hardening a polymerizable mixture incorporating at least one epoxy resin, pitch and at least one epoxy resin hardener and wherein said polymerizable mixture is allowed to harden to obtain a solid block within the barrel.
Claim 12
Dependent Claim
94 words
A process according to claim 1, wherein the waste is introduced into a basket, the basket containing the waste is placed in a barrel so as to leave a space between the inner barrel wall and the outer basket wall and the barrel and basket are filled with the polymerizable mixture incorporating at least one epoxy resin, pitch and at least one epoxy resin hardener, the mixture being hardened to obtain in said barrel a solid block having an outer layer formed solely from the polymerized mixture based on epoxy resin, pitch and hardener.
Claim 13
Dependent Claim
67 words
A filler-free polymerizable mixture with two constituents for the conditioning of radioactive or toxic waste, which consisting essentially of a first liquid constituent incorporating at least one epoxy resin and a second liquid constituent incorporating a mixture of pitch and at least one epoxy resin hardener, the pitch proportion in the second liquid constituent being 53 to 73% by wt., said mixture being miscible with organic liquids.
Claim 14
Dependent Claim
67 words
A filler-free polymerizable mixture with two constituents for the conditioning of radioactive or toxic waste, which consisting essentially of a first liquid constituent incorporating at least one epoxy resin and a second liquid constituent incorporating a mixture of pitch and at least one epoxy resin hardener, the pitch proportion in the second liquid constituent being 53 to 73% by wt., said mixture being miscible with organic liquids.
Claim 15
Dependent Claim
23 words
A mixture according to claim 12, wherein the epoxy resin is a bis-phenol A diglycidyl ether, to which is added a reactive diluent.
Claim 16
Dependent Claim
18 words
A mixture according to claim 12, wherein the hardener is an adduct of diaminodiphenyl methane and epoxy resin.
Claim 17
Dependent Claim
22 words
A mixture according to claim 12, wherein the hardener comprises a cycloaliphatic polyamine and an adduct of diaminodiphenyl methane and epoxy resin.
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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) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |