US4080411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slurry-cast propellant method
Assignee: Hercules LLC
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Filing: 1968-08-21
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Granted: 1978-03-21
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Expires: 1988-08-21
Abstract
Abstract A process is provided for preparing double base propellant by slurry casting in which flake casting powder is employed as the source of nitrocellulose. High burning rate propellants can be prepared by this process employing flake casting powder containing ballistic modifiers.
Inventors
- 👤 Norval F. Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:15
CPC Classifications
C; C06; C06B; C06B21/00; C06B21/0033; C06B21/0058
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
113 words
A process for preparation of double base slurry-cast propellants employing flake casting powder as the source of nitrocellulose, said process comprising (a) admixing fibrous nitrocellulose and a volatile solvent therefor to form a viscous propellant mass, (b) blocking the viscous propellant mass, (c) extruding the blocked propellant mass into strands of propellant, (d) cutting the propellant strands into flakes of casting powder, (e) drying the flakes of casting powder to remove the volatile solvent therefrom, (f) admixing the dried flake casting powder and a casting liquid to form a pourable slurry, (g) pouring the pourable slurry into a mold, and (h) curing the cast slurry to form a consolidated double base propellant charge.
Claim 2
Dependent Claim
113 words
A process for preparation of double base slurry-cast propellants employing flake casting powder as the source of nitrocellulose, said process comprising (a) admixing fibrous nitrocellulose and a volatile solvent therefor to form a viscous propellant mass, (b) blocking the viscous propellant mass, (c) extruding the blocked propellant mass into strands of propellant, (d) cutting the propellant strands into flakes of casting powder, (e) drying the flakes of casting powder to remove the volatile solvent therefrom, (f) admixing the dried flake casting powder and a casting liquid to form a pourable slurry, (g) pouring the pourable slurry into a mold, and (h) curing the cast slurry to form a consolidated double base propellant charge.
Claim 3
Dependent Claim
43 words
The process of claim 1 in which the flake casting powder is prepared in the form of thin discs having a diameter of from about 25 mils to about 60 mils and a thickness of from about 3 mils to about 10 mils.
Claim 4
Dependent Claim
21 words
The process of claim 2 in which the flake casting powder is comprised of nitrocellulose and at least one ballistic modifier.
Claim 5
Dependent Claim
16 words
The process of claim 3 in which the pourable slurry contains a crosslinking component for nitrocellulose.
Claim 6
Dependent Claim
14 words
The process of claim 4 in which the casting liquid is comprised of nitroglycerin.
Claim 7
Dependent Claim
15 words
The process of claim 5 in which the crosslinking component for nitrocellulose is a diisocyanate.
Claim 8
Dependent Claim
17 words
The process of claim 4 in which the casting liquid is comprised of nitroglycerin and dinormalpropyl adipate.
Claim 9
Dependent Claim
17 words
The process of claim 5 in which the crosslinking component is the prepolymer of polyglycol adipate-tolylene diisocyanate.
Claim 10
Dependent Claim
12 words
The process of claim 8 wherein the ballistic modifier is lead β-resorcylate.
Claim 11
Dependent Claim
12 words
The process of claim 8 wherein the ballistic modifier is lead salicylate.
Claim 12
Dependent Claim
31 words
The process of claim 5 in which the pourable slurry comprises by weight from about 50 to about 80% casting liquid, and from about 20 to about 50% flake casting powder.
References Cited (Backward Citations)
US3422169A
Cited
US3163567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-20 | 1981-09-19 | 1982-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-20 | 1985-09-19 | 1986-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-20 | 1989-09-19 | 1990-03-21 | $7700.00 | Window Closed / Lapsed |