US4263070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally stable gun and caseless cartridge propellants
Assignee: ATK Launch Systems LLC
•
Filing: 1974-03-05
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Granted: 1981-04-21
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Expires: 1994-03-05
Abstract
Abstract The water and oil resistance of caseless gun propellant compositions of the type which comprise cyclotetramethylenetetramine (HMX) as the high energy component and polyurethane as the binder are improved by preparing the binder by reaction of isocyanates with a hydroxyl-terminated block copolymer of ethylene oxide and propylene oxide or mixture of the block copolymer with other hydroxyl-terminated polyalkylene oxides. The block copolymer preferably contains from 40% to 60% by weight of ethylene oxide units and comprises at least 15% by weight of the binder.
Inventors
- 👤 Raymond M. Price
- 👤 Russell Reed, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:32
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/4837; C06; C06B; C06B25/00; C06B25/34; C06B45/00; C06B45/04; C06B45/06; C06B45/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
An extrudable, curable composition suitable for use in making a caseless gun propellant grain and having improved water and oil resistance, said composition consisting essentially of an intimate mixture of 65 to 90% by weight of finely divided HMX, 5 to 20% by weight of a block copolymer of ethylene oxide and propylene oxide containing 40% to 60% by weight of ethylene oxide units and having a molecular weight of 1000 to 4000, 0.5 to 5% by weight of a triol cross-linking agent and 1 to 15% by weight of a multi-functional isocyanate.
Claim 2
Dependent Claim
93 words
An extrudable, curable composition suitable for use in making a caseless gun propellant grain and having improved water and oil resistance, said composition consisting essentially of an intimate mixture of 65 to 90% by weight of finely divided HMX, 5 to 20% by weight of a block copolymer of ethylene oxide and propylene oxide containing 40% to 60% by weight of ethylene oxide units and having a molecular weight of 1000 to 4000, 0.5 to 5% by weight of a triol cross-linking agent and 1 to 15% by weight of a multi-functional isocyanate.
Claim 3
Dependent Claim
13 words
The composition of claim 1 wherein the triol cross-linking agent is trimethylol propane.
Claim 4
Dependent Claim
14 words
The composition of claim 1 wherein the multi-functional isocyanate is lysine diisocyanate methyl ester.
Claim 5
Dependent Claim
12 words
The composition of claim 1 wherein the multi-functional isocyanate is tolylene diisocyanate.
Claim 6
Dependent Claim
19 words
The composition of claim 1 wherein the average particle diameter of the HMX is from 1 to 5 microns.
Claim 7
Dependent Claim
13 words
Gun propellant grains formed from the extruded and cured composition of claim 1.
References Cited (Backward Citations)
US3529042A
Cited
US3762328A
Cited
US3834957A
Cited
US3730094A
Cited
US3725154A
Cited
US3847081A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-20 | 1984-10-20 | 1985-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-20 | 1988-10-20 | 1989-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-20 | 1992-10-20 | 1993-04-21 | $7700.00 | Window Closed / Lapsed |