US3798090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing cross-linked propellants
Assignee: Hercules LLC
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Filing: 1968-12-04
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Granted: 1974-03-19
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Expires: 1988-12-04
Abstract
Abstract Chemically modified double base propellant formulations containing a phenol-blocked diisocyanate as cross-liking agent are cross-linked by unblocking the diisocyanate during propellant cure. A typical formulation contains nitrocellulose, nitroglycerin, ammonium perchlorate or cyclotrimethylene trinitramine, aluminum and a prepolymer of polyglycoladipate and 2,4-tolylene diisocyanate.
Inventors
- 👤 J Allabashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:21
CPC Classifications
C; C06; C06B; C06B21/00; C06B21/0008; C06B21/0025; C06B25/00; C06B25/18; C06B25/24; C06B25/26; C06B45/00; C06B45/04; C06B45/06; C06B45/10; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/64; C08G18/6484; C08G18/70; C08G18/72; C08G18/80; C08G18/8061; C08G18/8064; C08G18/8067
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
12 words
The process of claim 1 wherein the plasticizer is a nitrate ester.
Claim 2
Dependent Claim
17 words
The process of claim 2 wherein the curing is effected in the presence of an unblocking catalyst.
Claim 3
Dependent Claim
29 words
The process of claim 3 wherein the nitrate ester is nitroglycerin and the diisocyanate is a prepolymer of polyglycoladipate and 2,4-tolylenediisocyanate having the isocyanate end groups blocked with m-nitrophenol.
Claim 4
Dependent Claim
28 words
A propellant formulation consisting essentially of nitrocellulose binder, plasticizer, solid oxidizer, metal fuel, and a plasticizer-soluble, blocked diisocyanate prepared by reacting a diisocyanate with a negatively substitued phenol.
Claim 5
Dependent Claim
12 words
The formulation of claim 5 wherein the plasticizer is a nitrate ester.
Claim 6
Dependent Claim
28 words
The formulation of claim 6 wherein the nitrate ester is nitroglycerin and the blocked diisocyanate is the reaction product of a prepolymer of polyglycoladipate and 2,4-tolylenediisocyanate with m-nitrophenol.
Claim 7
Dependent Claim
17 words
The formulation of claim 7 wherein the oxidizer is cyclotrimethylene trinitramine and the metal fuel is aluminum.
Claim 8
Dependent Claim
17 words
The formulation of claim 7 wherein the oxidizer is ammonium perchlorate and the metal fuel is aluminum.
Claim 9
Dependent Claim
9 words
The formulation of claim 9 also containing dibutyltindiacetate catalyst.
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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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |