US3743554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitrocellulose propellant containing diffused linear polyester burning rate deterrent
Assignee: Hercules LLC
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Filing: 1971-09-03
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Granted: 1973-07-03
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Expires: 1991-09-03
Abstract
Abstract Manufacture of burning rate deterrent coated propellants by contacting a nitrocellulose smokeless powder, at an elevated temperature, with a defined linear polyester of a new class of burning rate deterrents, which wets, and diffuses into the smokeless powder at the elevated temperature level, as a plasticizer therefor, but is substantially non-migrating within the smokeless powder at lower temperatures; effecting the contacting step under conditions causing the polyester to coat and penetrate the smokeless powder to form the coated propellant; and then reducing the temperature of the resulting deterrent coated propellant to the lower temperature above described. Also provided, are nitrocellulose smokeless powder propellants having as a burning rate deterrent, the defined polyester coating diffused by its own plasticizing action into the propellant to form a resulting burning rate gradient therefor.
Inventors
- 👤 D Mellow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:35
CPC Classifications
C; C06; C06B; C06B21/00; C06B21/0083; C06B45/00; C06B45/18; C06B45/20; C06B45/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
26 words
A smokeless powder propellant of claim 1, wherein said burning rate deterrent coating is a linear polyester formed from a dihydric alcohol and a dibasic acid.
Claim 2
Dependent Claim
49 words
A smokeless powder propellant of claim 2 wherein said dihydric alcohol is selected from the group consisting of ethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol and neopentyl glycol, and said dibasic acid is selected from the group consisting of adipic acid, azelaic acid, phthalic acid, and sebacic acid.
Claim 3
Dependent Claim
31 words
A smokeless powder propellant product of claim 2 containing said polyester in an amount of from 0.5 to 10 weight percent, based on the weight of said smokeless powder when uncoated.
Claim 4
Dependent Claim
25 words
A smokeless powder propellant product of claim 4 wherein the average molecular weight of said polyester is within the range of from 1,500 to 20,000.
Claim 5
Dependent Claim
102 words
A nitrocellulose smokeless powder propellant having an ethylene glycol-sebasic acid resin as a linear polyester burning rate deterrent coating diffused by its own plasticizing action into said propellant to form a resulting burning rate gradient therefor, and said smokeless powder propellant containing said polyester in an amount of from 0.5 to 10 weight percent based on the weight of said smokeless powder when uncoated; said polyester being compatible with said nitrocellulose, having a weight average molecular weight of from 1,500 to 20,000, a melting point not exceeding 190*F., and being substantially non-migrating within said smokeless powder at temperatures not exceeding about 150*F.
Claim 6
Dependent Claim
102 words
A nitrocellulose smokeless powder propellant having an ethylene glycol-adipic acid resin as a linear polyester burning rate deterrent coating diffused by its own plasticizing action into said propellant to form a resulting burning rate gradient therefor, and said smokeless powder propellant containing said polyester in an amount of from 0.5 to 10 weight percent based on the weight of said smokeless powder when uncoated; said polyester being compatible with said nitrocellulose, having a weight average molecular weight of from 1,500 to 20,000, a melting point not exceeding 190*F., and being substantially non-migrating within said smokeless powder at temperatures not exceeding about 150*F.
Claim 7
Dependent Claim
102 words
A nitrocellulose smokeless powder propellant having an ethylene glycol-phthalic acid resin as a linear polyester burning rate deterrent coating diffused by its own plasticizing action into said propellant to form a resulting burning rate gradient therefor, and said smokeless powder propellant containing said polyester in an amount of from 0.5 to 10 weight percent based on the weight of said smokeless powder when uncoated; said polyester being compatible with said nitrocellulose, having a weight average molecular weight of from 1,500 to 20,000, a melting point not exceeding 190*F., and being substantially non-migrating within said smokeless powder at temperatures not exceeding about 150*F.
Claim 8
Dependent Claim
102 words
A nitrocellulose smokeless powder propellant having a neopentyl glycol-adipic acid resin as a linear polyester burning rate deterrent coating diffused by its own plasticizing action into said propellant to form a resulting burning rate gradient therefor, and said smokeless powder propellant containing said polyester in an amount of from 0.5 to 10 weight percent based on the weight of said smokeless powder when uncoated; said polyester being compatible with said nitrocellulose, having a weight average molecular weight of from 1,500 to 20,000, a melting point not exceeding 190*F., and being substantially non-migrating within said smokeless powder at temperatures not exceeding about 150*F.
Claim 9
Dependent Claim
100 words
A single base nitrocellulose smokeless powder propellant having a linear polyester as a burning rate deterrent coating diffused by its own plasticizing action into said propellant to form a resulting burning rate gradient therefor, and said smokeless powder propellant containing said polyester in an amount of from 0.5 to 10 weight percent based on the weight of said smokeless powder when coated; said polyester being compatible with said nitrocellulose, having a weight average molecular weight of from 1,500 to 20,000, a melting point not exceeding 190*F., and being substantially non-migrating within said smokeless powder at temperatures not exceeding about 150*F.
Claim 10
Dependent Claim
100 words
A double base nitrocellulose smokeless powder propellant having a linear polyester as a burning rate deterrent coating diffused by its own plasticizing action into said propellant to form a resulting burning rate gradient therefor, and said smokeless powder propellant containing said polyester in an amount of from 0.5 to 10 weight percent based on the weight of said smokeless powder when uncoated; said polyester being compatible with said nitrocellulose, having a weight average molecular weight of from 1,500 to 20,000, a melting point not exceeding 190*F., and being substantially non-migrating within said smokeless powder within temperatures not exceeding about 150*F.
References Cited (Backward Citations)
US3108916A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |