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US4279672A
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US
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Fragmentable propellant containing polyvinyl nitrate binder
Assignee: Societe Nationale des Poudres et Explosifs
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Filing: 1978-11-29
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Granted: 1981-07-21
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Expires: 1998-11-29
Abstract
Abstract Unit charge of propellant powder, which can be fragmented and has the ballistic properties of a granular charge. A charge of this type consists of 85 to 97% of grains of propellant powder containing nitrocellulose and 15 to 3% of a thermoplastic energy-producing binder which is in the form of small solid grains, under normal conditions, and has the following composition: (a) 30 to 60% of polyvinyl nitrate, (b) 70 to 40% of nitrocellulose having a low nitrogen content, or polyvinyl acetate or a mixture of the two, and (c) optionally, a stabilizer. The use of a solid binder makes it possible to mix the propellant powder with the said binder homogeneously and instantaneously, to introduce precise amounts of the mixture thus obtained into a mould and to simplify the moulding operations.
Inventors
- 👤 Louis J. J. Leneveu
- 👤 Didier J. Treneules
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:26
CPC Classifications
C; C06; C06B; C06B25/00; C06B25/18; C06B25/20; C06B45/00; C06B45/04; C06B45/06; C06B45/10; C06B45/105
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
87 words
A fragmentable unit charge of propellant powder, which consists of 85 to 97% by weight of grains of propellant powder containing nitrocellulose, which are agglomerated together by means of 15 to 3%, by weight of a thermoplastic, solid energy-producing binder having the following composition: (a) 30 to 60% by weight, relative to the binder, of polyvinyl nitrate, (b) 70 to 40% by weight, relative to the binder, of nitrocellulose having a low nitrogen content of less than 12.8%, or polyvinyl acetate or a mixture of the two.
Claim 2
Dependent Claim
87 words
A fragmentable unit charge of propellant powder, which consists of 85 to 97% by weight of grains of propellant powder containing nitrocellulose, which are agglomerated together by means of 15 to 3%, by weight of a thermoplastic, solid energy-producing binder having the following composition: (a) 30 to 60% by weight, relative to the binder, of polyvinyl nitrate, (b) 70 to 40% by weight, relative to the binder, of nitrocellulose having a low nitrogen content of less than 12.8%, or polyvinyl acetate or a mixture of the two.
Claim 3
Dependent Claim
39 words
Unit charge, according to claim 1, wherein the energy-producing binder has the following composition: (a) 30 to 60% by weight of polyvinyl nitrate, (b) 70 to 40% by weight of nitrocellulose having a nitrogen content of less than 12.8%.
Claim 4
Dependent Claim
23 words
Unit charge according to claim 1, wherein the propellant powder is a single-base powder containing granular nitrocellulose, obtained by the "with solvent" process.
Claim 5
Dependent Claim
23 words
Unit charge, according to claim 3, wherein the propellant powder is a monotubular powder having a potential energy of 870 to 950 calories/g.
Claim 6
Dependent Claim
91 words
A fragmentable unit charge of propellant powder, which consists of 85 to 97% by weight of grains of propellant powder containing nitrocellulose, which are agglomerated together by means of 15 to 3% by weight of a thermoplastic, solid energy-producing binder having the following composition: (a) 30 to 60% by weight, relative to the binder, of polyvinyl nitrate, (b) 70 to 40% by weight, relative to the binder, of nitrocellulose having a low nitrogen content of less than 12.8%, or polyvinyl acetate or a mixture of the two, and (c) a stabiliser.
Claim 7
Dependent Claim
91 words
A fragmentable unit charge of propellant powder, which consists of 85 to 97% by weight of grains of propellant powder containing nitrocellulose, which are agglomerated together by means of 15 to 3% by weight of a thermoplastic, solid energy-producing binder having the following composition: (a) 30 to 60% by weight, relative to the binder, of polyvinyl nitrate, (b) 70 to 40% by weight, relative to the binder, of nitrocellulose having a low nitrogen content of less than 12.8%, or polyvinyl acetate or a mixture of the two, and (c) a stabiliser.
Claim 8
Dependent Claim
26 words
Unit charge, according to claim 5, wherein the stabiliser is 2-nitrodiphenylamine added in an amount which can reach 3% by weight, relative to the energy-producing binder.
Claim 9
Dependent Claim
50 words
Unit charge, according to claim 5, wherein the energy-producing binder has the following composition: 40 to 60 parts by weight of highly nitrated polyvinyl nitrate, 60 to 40 parts by weight of nitrocellulose having a nitrogen content of 11% to 12.6%, and 2 to 3 parts by weight of 2-nitrodiphenylamine.
References Cited (Backward Citations)
US3676233A
Cited
US4023996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-20 | 1985-01-19 | 1985-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-20 | 1989-01-19 | 1989-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-20 | 1993-01-19 | 1993-07-21 | $7700.00 | Window Closed / Lapsed |