US4536235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion inhibitors on a base of oxygenated polyurethane elastomer which contains fibers for the double base propellant
Assignee: Societe Nationale des Poudres et Explosifs
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Filing: 1983-12-20
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Granted: 1985-08-20
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Expires: 2003-12-20
Abstract
Abstract A combustion inhibitor for a double base propellant is described which comprises a polyurethane elastomer having in chemically combined form a compound which is an aliphatic polyester polyol or an aliphatic polyether polyol, or a mixture thereof, which compound contains 2-6 hydroxyl groups per molecule, and an aliphatic polyisocyanate. The inhibitor also contains 0.1-10 parts by weight of mineral fibers or thermostable organic fibers of length between 0.1 mm and 15 mm per 100 parts inhibitor. The inhibitor may contain an organic gasifiable charge and an aliphatic plasticizer.
Inventors
- 👤 Andre Lelu
- 👤 Bruno Gonthier
- 👤 Jean Grignon
- 👤 Jean-Michel Tauzia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:32
CPC Classifications
C; C06; C06B; C06B45/00; C06B45/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
A gasifiable inhibitor for a double base propellant which comprises a polyurethane elastomer having in chemically combined form a product which is an aliphatic polyester polyol or an aliphatic polyether polyol, or a mixture thereof which product contains 2-6 hydroxyl groups per molecule, an aliphatic polyisocyanate, at least one organic gasifiable charge and an aliphatic plasticizer, and 0.1-10 parts by weight of mineral fibers or thermostable organic fibers of length between 0.1 mm and 15 mm per 100 parts inhibitor.
Claim 2
Dependent Claim
80 words
A gasifiable inhibitor for a double base propellant which comprises a polyurethane elastomer having in chemically combined form a product which is an aliphatic polyester polyol or an aliphatic polyether polyol, or a mixture thereof which product contains 2-6 hydroxyl groups per molecule, an aliphatic polyisocyanate, at least one organic gasifiable charge and an aliphatic plasticizer, and 0.1-10 parts by weight of mineral fibers or thermostable organic fibers of length between 0.1 mm and 15 mm per 100 parts inhibitor.
Claim 3
Dependent Claim
19 words
The combustion inhibitor according to claim 1 which additionally contains a low molecular weight polyol as a chain extender.
Claim 4
Dependent Claim
21 words
The combustion inhibitor according to claim 1 wherein the inhibitor is applied to a double base propellant comprising nitrocellulose and nitroglycerin.
Claim 5
Dependent Claim
20 words
The combustion inhibitor according to claim 1 which comprises 0.5-4 parts by weight of fibers per 100 parts of inhibitor.
Claim 6
Dependent Claim
18 words
The combustion inhibitor according to claim 1 wherein the fibers have a length between 0.5 and 6 mm.
Claim 7
Dependent Claim
33 words
The combustion inhibitor according to claim 1 wherein in said polyol polyester or polyol polyether, the ratio between the number of carbon atoms and the number of oxygen atoms is less than 5.
Claim 8
Dependent Claim
18 words
The combustion inhibitor according to claim 1 wherein said polyol has a molecular weight between 400 and 5,000.
Claim 9
Dependent Claim
42 words
The combustion inhibitor according to claim 1 which includes up to 300 parts of a gasifiable charge which is a member selected from the group consisting of oxamide, ammonium oxalate, ammonium carbonate, polyoxyethylene, polyoxypropylene and polyoxymethylene per 100 parts of said polyurethane.
Claim 10
Dependent Claim
24 words
The combustion inhibitor according to claim 1 wherein said fibers are glass fibers, carbon fibers, silicone carbide fibers, asbestos fibers or polyphenylene terephthalamide fibers.
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) | 1988-08-19 | 1989-02-18 | 1989-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-19 | 1993-02-18 | 1993-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-19 | 1997-02-18 | 1997-08-20 | $7700.00 | Window Closed / Lapsed |