US4379903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propellant binders cure catalyst
Assignee: United States Department of the Navy
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Filing: 1982-03-01
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Granted: 1983-04-12
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Expires: 2002-03-01
Abstract
Abstract A multiple component catalyst system for curing of energetic urethane binders for solid fuel propellants and gas generators based upon curing of glycidyl-azide polymer and isocynate curative mixtures. Void or bubble free propellant grains are obtained by employing a cure catalyst composed of a mixture of triphenyl bismuth and dibutyltin dilaurate, preferably in a respective ratio of about 10:1 by weight. The void free propellant grains have burn characteristics acceptable for missile propulsion applications.
Inventors
- 👤 Russell Reed, Jr.
- 👤 May L. Chan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:02
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C06; C06B; C06B45/00; C06B45/04; C06B45/06; C06B45/10; C06B45/105; C08G18/08; C08G18/16; C08G18/22
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
46 words
A process for the curing of a glycidyl-azide polymer (GAP)/isocyanate binder system which comprises: (a) adding a non-gassing catalyst to a mixture comprising glycidyl-azide polymer and isocyanate curative to form said binder system; and (b) curing said binder system to form a substantially void free grain.
Claim 2
Dependent Claim
46 words
A process for the curing of a glycidyl-azide polymer (GAP)/isocyanate binder system which comprises: (a) adding a non-gassing catalyst to a mixture comprising glycidyl-azide polymer and isocyanate curative to form said binder system; and (b) curing said binder system to form a substantially void free grain.
Claim 3
Dependent Claim
20 words
A process according to claim 1 wherein said catalyst comprises a mixture of triphenyl bismuth (TPB) and dibutyltin dilaurate (T-12).
Claim 4
Dependent Claim
32 words
A process according to claim 2 wherein the proportion of TPB to T-12 in said catalyst mixture is within the range of from about 2.5 to 1 to about 14 to 1.
Claim 5
Dependent Claim
25 words
A process according to claim 1 wherein said binder system is cured at temperatures within the range of ambient room temperature to about 140° F.
Claim 6
Dependent Claim
25 words
A process according to claim 1 wherein said binder system is cured at temperatures within the range of about 100° F. to about 130° F.
Claim 7
Dependent Claim
27 words
A process according to claim 1 wherein said binder system is cured for a time period within the range of about 24 hours to about 72 hours.
Claim 8
Dependent Claim
30 words
A process according to claim 1 wherein sufficient catalyst is employed such that a pot life of the uncured binder is within the range of 3 hours to seven hours.
Claim 9
Dependent Claim
27 words
A process according to claim 2 wherein the weight ratio of T-12 to GAP is within the range of 0.0001 to 1 to about 0.0003 to 1.
Claim 10
Dependent Claim
17 words
A process according to claim 8 wherein the equivalent weight of said GAP is about 950 grams.
Claim 11
Dependent Claim
19 words
A process according to claim 1 wherein about a stoichiometric ratio of amounts of GAP to isocyanate is employed.
Claim 12
Dependent Claim
24 words
A process according to claim 1 wherein said GAP is selected from the group consisting of glycerol initiated GAP and ethylene glycol initiated GAP.
Claim 13
Dependent Claim
33 words
A process according to claim 1 wherein said isocyanate is selected from the group consisting of lysine diisocyanate methyl ester, hexamethylene diisocyanate, bis (4-isocyanato cyclohexyl) methane, and the biuret trimer of hexamethylene diisocyanate.
Claim 14
Dependent Claim
38 words
A process according to claim 1 wherein said binder system mixture further comprises liquid plasticer selected from the group consisting of bis (fluorodinitroethyl)formal, trimethylolethane trinitrate, and a eutectic mixture of about equal weights of bis (2,2-dinitropropyl)formal and acetal.
Claim 15
Dependent Claim
30 words
A process according to claim 1 wherein said binder system mixture further comprises cyclotetramethylenetetranitramine crystals of about 10 microns diameter and aluminum power of about 80 to 100 microns diameter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-04-11 | 1986-10-11 | 1987-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-11 | 1990-10-11 | 1991-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-11 | 1994-10-11 | 1995-04-12 | $7700.00 | Window Closed / Lapsed |