Patent US4506069A successfully refreshed from Google Patents.
US4506069A
Expired / Lapsed
US
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Low vulnerability gun propellant
Assignee: ATK Launch Systems LLC
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Filing: 1983-12-21
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Granted: 1985-03-19
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Expires: 2003-12-21
Abstract
Abstract A prepolymer for use in preparing a binder for low vulnerability gun propellants. The condensation of an alkynediol and formaldehyde produces a prepolymer which is cured with a polyisocyanate. The resulting binder can be combined with 1,3,5,7-tetramethylenetetranitramine (HMX) or 1,3,5-trimethylenetrinitramine (RDX), and is readily extruded as multi-perforated propellant grains, the extruded material having a greatly reduced tendency to slumping, and an enhanced mass impetus value.
Inventors
- 👤 Michael W. Barnes
- 👤 Clifford E. Kristofferson
- 👤 Anthony P. Manzara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:07
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/6705; C06; C06B; C06B21/00; C06B21/0033; C06B21/0075; C06B45/00; C06B45/04; C06B45/06; C06B45/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
17 words
A polyisocyanate curable prepolymer comprising a polyalkynediol formal having a number average molecular weight greater than 1000.
Claim 2
Dependent Claim
17 words
A polyisocyanate curable prepolymer comprising a polyalkynediol formal having a number average molecular weight greater than 1000.
Claim 3
Dependent Claim
14 words
The prepolymer of claim 1 wherein the molecular weight is greater than about 1250.
Claim 4
Dependent Claim
25 words
The prepolymer of claim 1 wherein the prepolymer is formed from the condensation of formaldehyde and an alkynediol comprising 2-butyne-1,4-diol, 2-pentyne-1,5-diol, 3-hexyne-1,6-diol, 4-octyne-1,8-diol, or 5-decyne-1,10-diol.
Claim 5
Dependent Claim
15 words
The prepolymer of claim 1 wherein the prepolymer has a functionality of greater than 2.0.
Claim 6
Dependent Claim
20 words
The prepolymer of claim 1 wherein the polyalkynediol formal is poly-2-butyne-1,4-diol formal having a number average molecular weight of 1260.
Claim 7
Dependent Claim
13 words
The prepolymer of claim 5 having 0.16 equivalents of OH/100 g of prepolymer.
Claim 8
Dependent Claim
78 words
A method of preparing the prepolymer of claim 1 comprising: (a) reacting substantially equimolar amounts of formaldehyde and alkynediol while removing produced water until the reaction is substantially complete, (b) adding to the product of step (a) an additional between about 5 and about 20% by weight of formaldehyde or a formaldehyde source based upon the weight of formaldehyde initially reacted, and (c) reacting the additional formaldehyde while removing additionally produced water until the reaction is substantially complete.
Claim 9
Dependent Claim
13 words
The method of claim 7 wherein the formaldehyde source is paraformaldehyde or symtrioxane.
References Cited (Backward Citations)
US3145192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-18 | 1988-09-17 | 1989-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-18 | 1992-09-17 | 1993-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-18 | 1996-09-17 | 1997-03-19 | $7700.00 | Window Closed / Lapsed |