Patent US4039640A successfully refreshed from Google Patents.
US4039640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moldable compositions comprising polyvinyl nitrate
Assignee: Societe Nationale des Poudres et Explosifs
•
Filing: 1976-08-05
•
Granted: 1977-08-02
•
Expires: 1996-08-05
Abstract
Abstract A mouldable thermoplastic composition comprises (i) polyvinyl nitrate, (ii) nitrocellulose and/or polyvinyl acetate and (iii) 2-nitro-diphenylamine and may be used to form combustible articles such as cartridge cases. Preferably, the composition comprises from 30 to 90% by weight of polyvinyl nitrate based on the total weight of components (i) and (ii). The composition may comprise up to about 30% by weight, based on the weight of components (i) and (ii), of at least one additive selected from cellulose acetate, dinitrotoluene, phthalates, non-volatile esters, heterocyclic ketones, ureas and ABS copolymers.
Inventors
- 👤 Louis J. Leneveu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:03
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/32; C06; C06B; C06B21/00; C06B21/0033; C06B21/005; C06B21/0091; C06B45/00; C06B45/04; C06B45/06; C06B45/10; C06B45/105; C08L; C08L1/00; C08L1/08; C08L1/16; C08L1/18; C08L39/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
67 words
A method of making a combustible article, which comprises mixing (i) polyvinyl nitrate, (ii) at least one material selected from the group consisting of nitrocellulose and polyvinyl acetate, and (iii) 2-nitrodiphenylamine, in an organic solvent, forming fibers, stretching the fibers, forming granules, heating the granules to a temperature between their softening temperature and their decomposition temperature, and moulding the granules so formed to produce the combustible article.
Claim 2
Independent Claim
67 words
A method of making a combustible article, which comprises mixing (i) polyvinyl nitrate, (ii) at least one material selected from the group consisting of nitrocellulose and polyvinyl acetate, and (iii) 2-nitrodiphenylamine, in an organic solvent, forming fibers, stretching the fibers, forming granules, heating the granules to a temperature between their softening temperature and their decomposition temperature, and moulding the granules so formed to produce the combustible article.
Claim 3
Dependent Claim
25 words
A method according to claim 1, which comprises mixing the granules of the mouldable thermoplastic composition with a porous powder comprising nitrocellulose prior to moulding.
Claim 4
Dependent Claim
44 words
The method according to claim 1 which additionally comprises dehydrating polyvinyl nitrate with isopropyl alcohol and the granules are prepared by grinding said dehydrated polyvinyl nitrate, mixing with said component (ii), in a solvent, adding 2-nitro-diphenylamine, stretching the resulting fibers and cutting into granules.
Claim 5
Dependent Claim
20 words
The method according to claim 1 wherein the molding step is compression moulding at a pressure of about 10 bars.
Claim 6
Dependent Claim
13 words
The method according to claim 1 wherein the molding step is injection moulding.
Claim 7
Dependent Claim
17 words
The method according to claim 1 wherein said polyvinyl nitrate constitutes 30-90% of weight of said granules.
Claim 8
Dependent Claim
21 words
The method according to claim 2 wherein said porous powder comprising nitrocellulose constitutes up to 60% by weight of the mixture.
References Cited (Backward Citations)
US3078200A
Cited
US3422170A
Cited
US3428502A
Cited
US3447983A
Cited
US3563977A
Cited
US3669924A
Cited
US3673286A
Cited
US3779820A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |