US4011818A
Expired / Lapsed
US
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Warhead explosive liner
Assignee: United States Department of the Navy
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Filing: 1976-04-01
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Granted: 1977-03-15
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Expires: 1996-04-01
Abstract
Abstract An improved warhead liner which is made up of (A) a first layer composed of (1) a polyurethane elastomer which is the reaction product of a hydroxy-terminated polydiene intermediate polymer and a diisocyanate, (2) a hydrocarbon process oil, (3) hollow phenolic microspheres, (4) carbon black, and (5) asbestos fibers; and (B) a second layer composed of a hard, solvent-resistant epoxypolyamide; the first layer covers the inside surface of the warhead casing and the second layer covers the inside surface of the first layer. This liner is particularly suited for use in warheads containing rubbery, plasticized nitrocellulose explosives.
Inventors
- 👤 Max J. Stosz, Jr.
- 👤 Harold F. Eccleston, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:27
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/69; F; F42; F42B; F42B12/00; F42B12/72; F42B12/76; F42B12/80
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
248 words
In a warhead having a casing, a liner covering the inner surface of the casing, and a rubbery, plasticized explosive within the casing, the improvement comprising: using as said liner a two layer composite comprising: A. a first layer composed of a filled polyurethane elastomer formed by curing a mixture comprising: 1. a hydroxy-terminated polydiene intermediate polymer wherein: a. the polydiene chain of the hydroxy-terminated polydiene intermediate polymer is formed by polymerizing 1,3-diene monomers of 4 to 6 carbon atoms, the monomers having the formula: ##STR6## wherein R 1 is selected from the group consisting of --H, --CH 3 and --CH 2 CH 3 and R 2 is selected from the group consisting of --H and --CH 3 , provided that when R 1 is --CH 2 CH 3 , R 2 is --H, and wherein the polydiene chain may be of either a single monomer type or a mixture of different monomer types of the above formula; b. the polydiene chain of the hydroxy-terminated polydiene intermediate polymer has a cis-1,4-type of unsaturation content of from 10 to 30 percent, a trans-1,4-type of unsaturation content of from 40 to 70 percent, and a vinyl (1,2)-type of unsaturation content of 10 to 30 percent; c. the hydroxy-terminated polydiene intermediate polymer has an average of from about 1.8 to about 2.5 predominantly primary, terminal allylic hydroxy groups per average molecule; and d. the average molecular weight of the hydroxy-terminated polydiene intermediate polymers is from about 1,000 to about 5,000; 2.
Claim 2
Dependent Claim
248 words
In a warhead having a casing, a liner covering the inner surface of the casing, and a rubbery, plasticized explosive within the casing, the improvement comprising: using as said liner a two layer composite comprising: A. a first layer composed of a filled polyurethane elastomer formed by curing a mixture comprising: 1. a hydroxy-terminated polydiene intermediate polymer wherein: a. the polydiene chain of the hydroxy-terminated polydiene intermediate polymer is formed by polymerizing 1,3-diene monomers of 4 to 6 carbon atoms, the monomers having the formula: ##STR6## wherein R 1 is selected from the group consisting of --H, --CH 3 and --CH 2 CH 3 and R 2 is selected from the group consisting of --H and --CH 3 , provided that when R 1 is --CH 2 CH 3 , R 2 is --H, and wherein the polydiene chain may be of either a single monomer type or a mixture of different monomer types of the above formula; b. the polydiene chain of the hydroxy-terminated polydiene intermediate polymer has a cis-1,4-type of unsaturation content of from 10 to 30 percent, a trans-1,4-type of unsaturation content of from 40 to 70 percent, and a vinyl (1,2)-type of unsaturation content of 10 to 30 percent; c. the hydroxy-terminated polydiene intermediate polymer has an average of from about 1.8 to about 2.5 predominantly primary, terminal allylic hydroxy groups per average molecule; and d. the average molecular weight of the hydroxy-terminated polydiene intermediate polymers is from about 1,000 to about 5,000; 2.
Claim 3
Dependent Claim
138 words
a hydrocarbon process oil, wherein the weight of hydrocarbon process oil used is from more than zero to about 4 times the weight of hydroxy-terminated polydiene intermediate polymer used; 3. a diisocyanate in an amount sufficient to supply from about 0.7 to about 1.3 isocyanate functional groups for each hydroxy functional group on the intermediate polymer; 4. hollow phenolic microspheres constituting from more than zero to about 20 percent by weight of the total uncured mixture; 5. carbon black constituting from more than zero to about 15 percent of the total weight of the mixture; and 6. asbestos fibers constituting from more than zero to about 8 percent of the total weight of the mixture; B. a second layer composed of a hard, solvent-resistant epoxy-polyamide; the first layer covering the inner surface of the warhead casing and the
Claim 4
Dependent Claim
138 words
a hydrocarbon process oil, wherein the weight of hydrocarbon process oil used is from more than zero to about 4 times the weight of hydroxy-terminated polydiene intermediate polymer used; 3. a diisocyanate in an amount sufficient to supply from about 0.7 to about 1.3 isocyanate functional groups for each hydroxy functional group on the intermediate polymer; 4. hollow phenolic microspheres constituting from more than zero to about 20 percent by weight of the total uncured mixture; 5. carbon black constituting from more than zero to about 15 percent of the total weight of the mixture; and 6. asbestos fibers constituting from more than zero to about 8 percent of the total weight of the mixture; B. a second layer composed of a hard, solvent-resistant epoxy-polyamide; the first layer covering the inner surface of the warhead casing and the
Claim 5
Dependent Claim
32 words
second layer covering the inner surface of the first layer. 2. The warhead liner of claim 1 wherein the polydiene chain of the hydroxy-terminated polydiene intermediate polymer is formed by polymerizing 1,3-polybutadiene.
Claim 6
Dependent Claim
29 words
The warhead liner of claim 1 wherein the hydroxy-terminated polydiene intermediate polymer has an average of from 2.1 to 2.3 predominantly primary, terminal, allylic hydroxy groups per average molecule.
Claim 7
Dependent Claim
22 words
The warhead liner of claim 1 wherein the average molecular weight of the hydroxy-terminated polydiene intermediate polymers is from 2000 to 3500.
Claim 8
Dependent Claim
28 words
The warhead liner of claim 1 wherein the weight of hydrocarbon process oil used is from 0.8 to 1.2 times the weight of hydroxy-terminated polydiene intermediate polymer used.
Claim 9
Dependent Claim
35 words
The warhead liner of claim 1 wherein the diisocyanate is used in an amount sufficient to provide from 0.8 to 1.0 isocyanate functional groups for each hydroxy functional group on the hydroxy-terminated polydiene intermediate polymer.
Claim 10
Dependent Claim
13 words
The warhead liner of claim 1 wherein the diisocyanate is an aromatic diisocyanate.
Claim 11
Dependent Claim
23 words
The warhead liner of claim 7 wherein the diisocyanate is selected from the group consisting of 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, and mixtures thereof.
Claim 12
Dependent Claim
23 words
The warhead liner of claim 1 wherein the hollow phenolic microspheres constitute from 8.0 to 13.0 percent by weight of the uncured mixture.
Claim 13
Dependent Claim
23 words
The warhead liner of claim 9 wherein the hollow phenolic microspheres constitute from 9.50 to 10.50 percent by weight of the uncured mixture.
Claim 14
Dependent Claim
22 words
The warhead liner of claim 1 wherein the carbon black constitutes from 3.0 to 8.0 percent by weight of the uncured mixture.
Claim 15
Dependent Claim
22 words
The warhead liner of claim 11 wherein the carbon black constitutes from 4.9 to 5.1 percent by weight of the uncured mixture.
Claim 16
Dependent Claim
22 words
The warhead liner of claim 1 wherein the asbestos fibers constitute from 1.0 to 3.0 percent by weight of the uncured mixture.
Claim 17
Dependent Claim
22 words
The warhead liner of claim 13 wherein the asbestos fibers constitute from 1.9 to 2.1 percent by weight of the uncured mixture.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |