US4284442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Castable TNT compositions containing a broad spectrum preformed thermoplastic polyurethane elastomer additive
Assignee: United States Department of the Army
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Filing: 1979-08-14
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Granted: 1981-08-18
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Expires: 1999-08-14
Abstract
Abstract Castable high explosive compositions of generally improved physical characteristics consist essentially of 2,4,6-trinitrotoluene (TNT) and about 0.05 to 10% by weight of the TNT of a thermoplastic polyurethane elastomer, which is soluble in the trinitrotoluene and is fully reacted, i.e. contains essentially no free isocyanate groups, prior to incorporation thereof in the explosive composition.
Inventors
- 👤 H. William Voigt, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:27
CPC Classifications
C; C06; C06B; C06B23/00; C06B23/001; C06B25/00; C06B25/04; C06B45/00; C06B45/04; C06B45/06; C06B45/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
70 words
A castable explosive composition consisting essentially of 2,4,6-trinitrotoluene (TNT) and about from 0.05 to 10% by weight, based on the TNT content of the explosive composition, of a thermoplastic polyurethane elastomer, which is dissolved in the TNT and is the reaction product of an organic diisocyanate and a hydroxy terminated polyester or a hydroxy terminated polyether containing essentially no free isocyanate groups prior to incorporation thereof in the explosive composition.
Claim 2
Dependent Claim
70 words
A castable explosive composition consisting essentially of 2,4,6-trinitrotoluene (TNT) and about from 0.05 to 10% by weight, based on the TNT content of the explosive composition, of a thermoplastic polyurethane elastomer, which is dissolved in the TNT and is the reaction product of an organic diisocyanate and a hydroxy terminated polyester or a hydroxy terminated polyether containing essentially no free isocyanate groups prior to incorporation thereof in the explosive composition.
Claim 3
Dependent Claim
49 words
A castable explosive composition according to claim 1, which consists essentially of 20-100% TNT 0-80% of at least one particulate crystalline high explosive of the group consisting of 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX) and 1,3,5,7-tetranitro-1,3,5,7-tetraazacyclooctane (HMX). and 0.05 to 10% of said elastomer, based on the TNT content of the explosive composition.
Claim 4
Dependent Claim
26 words
A castable explosive composition according to claim 2, wherein the amount of TNT is about 40% and the amount of RDX or HMX is about 60%.
Claim 5
Dependent Claim
70 words
A castable explosive composition according to claim 2, wherein the elastomer is the reaction product of (a) a hydroxy terminated polyester of a saturated aliphatic glycol of from 4 to 10 carbon atoms and a dicarboxylic acid of the formula HOOC--R--COOH, wherein R is an alkylene radical of 2 to 8 carbon atoms, (b) a saturated aliphatic glycol of from 4 to 10 carbon atoms, and (c) a diphenylmethane diisocyanate.
Claim 6
Dependent Claim
18 words
A castable explosive composition according to claim 2, wherein the organic diisocyanate is 2,4-toluene diisocyanate or 4,4'-diphenylmethane diisocyanate.
Claim 7
Dependent Claim
16 words
A castable explosive composition according to claim 2, wherein the polyester is a poly (caprolactone) glycol.
Claim 8
Dependent Claim
23 words
A castable explosive composition according to claim 4, wherein the elastomer is the reaction product of poly (tetramethyleneadipate) glycol, 1,4-butanediol, and 4,4'-diphenylmethane diisocyanate.
Claim 9
Dependent Claim
20 words
A castable explosive composition according to claim 2, wherein the amount of the elastomer is about from 0.1 to 5%.
Claim 10
Dependent Claim
26 words
A castable explosive composition according to claim 1 or 2 wherein the elastomer is the reaction product of an organic diisocyanate and a hydroxy terminated polyester.
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) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |