US3715246A
Expired / Lapsed
US
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Propellants derived from crosslinking of polybutadiene elastomers
Assignee: United States Department of the Army
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Filing: 1970-05-12
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Granted: 1973-02-06
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Expires: 1990-05-12
Abstract
Abstract Composite propellant compositions are disclosed which contain binders formed from polybutadiene prepolymers cross-linked by siloxane compounds. The crosslinking by siloxanes to produce propellant binders eliminates the need for end-capping polybutadiene to introduce functional groups through which crosslinking can be effected. The pertinent siloxane compounds contain two silicon hydride bonds of the types present in: 1,1,3,3-tetramethyldisiloxane, (CH3)2H.SiO.SiH(CH3)2; 1,1,1 3,5,7,7,7-octamethyltetrasiloxane, (CH3)3.Si.O.Si(H.CH3).O.Si(H.CH3).O.Si(CH3)3. The prepolymers are crosslinked in a composite propellant composition to produce the propellant binder for the composition. When the crosslinking technique is used in a propellant production process which additionally employs hydroxyl-terminated polybutadiene in combination with a polyisocyanate, a propellant binder with improved mechanical properties and improved stability is produced.
Inventors
- 👤 D Sayles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:27
CPC Classifications
C; C06; C06B; C06B45/00; C06B45/04; C06B45/06; C06B45/10; C08; C08K; C08K5/00; C08K5/54; C08K5/541; C08K5/5415; C08K5/5419; Y; Y10; Y10S; Y10S149/00; Y10S149/11; Y10S149/113
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
77 words
A composite propellant composition comprising an inorganic oxidizer ammonium perchlorate; aluminum metal fuel; a burning rate catalyst n-butylferrocene; and a binder comprised of a polybutadiene prepolymer crosslinked under catalytic reaction with a selected siloxane compound containing two silicon hydride bonds, said catalytic reaction being conducted in the presence of a catalyst selected from the group consisting of chloroplatinic acid and iron linoleate and said siloxane compound being selected from the group consisting of 1,1,3,3-tetramethyldisiloxane and 1, 1,1,3,5,7,7,7-octamethyltetrasiloxane.
Claim 2
Dependent Claim
77 words
A composite propellant composition comprising an inorganic oxidizer ammonium perchlorate; aluminum metal fuel; a burning rate catalyst n-butylferrocene; and a binder comprised of a polybutadiene prepolymer crosslinked under catalytic reaction with a selected siloxane compound containing two silicon hydride bonds, said catalytic reaction being conducted in the presence of a catalyst selected from the group consisting of chloroplatinic acid and iron linoleate and said siloxane compound being selected from the group consisting of 1,1,3,3-tetramethyldisiloxane and 1, 1,1,3,5,7,7,7-octamethyltetrasiloxane.
Claim 3
Dependent Claim
148 words
The propellant composition of claim 1 and wherein said inorganic oxidizer ammonium perchlorate is present in amounts from about 60 to about 72 weight percent of said composition; said aluminum metal fuel is powdered and said aluminum metal fuel is present in amounts from about 5 to about 20 weight percent of said composition; said burning rate catalyst of n-butylferrocene is present in amounts from 0.5 to about 3.0 weight percent of said composition; said catalyst for catalytic reaction is iron linoleate which is present in amounts from about 0.1 to about 0.3 weight percent of said composition; said selected siloxane compound is present in an amount from about 0.3 to about 2.0 weight percent of said composition; and wherein said composition additionally contains an interfacial bonding agent, as an additive, in the amount of from about 0.05 to about 1.0 weight percent of the total propellant ingredients.
Claim 4
Dependent Claim
182 words
The propellant composition of claim 2 and wherein said inorganic oxidizer ammonium perchlorate is a blend of 200 micron particle size, 67 parts, and 20 micron particle size, 33 parts, said blended ammonium perchlorate being present in an amount of about 71 weight percent of said composition; said aluminum metal fuel is present in an amount of about 16 weight percent of said composition; said burning rate catalyst of n-butylferrocene is present in an amount of about 2.5 weight percent of said composition; said iron linoleate is present in an amount of about 0.1 weight percent of said composition; said binder is present in an amount of about 10.4 weight percent of said composition said binder being comprised of said polybutadiene prepolymer in an amount of about 10 weight percent of said composition and crosslinked with the selected siloxane compound which is 1,1,3,3-tetramethyldisiloxane, and said selected siloxane compound being present in an amount of about 0.4 weight percent of said composition; and wherein said interfacial bonding agent is present in an amount of about 0.1 weight percent of the total propellant ingredients.
Claim 5
Dependent Claim
164 words
The propellant composition of claim 2 and wherein said inorganic oxidizer ammonium perchlorate is a blend of 200 micron particle size, 67 parts, and 20 micron particle size, 33 parts; said aluminum metal fuel is present in an amount of about 16 weight percent of said composition; said burning rate catalyst of n-butyl-ferrocene is present in an amount of about 2.5 weight percent of said composition; said iron linoleate is present in an amount of about 0.1 weight percent of said composition; said binder is present in an amount of about 10.4 weight percent of said composition, said binder is comprised of said polybutadiene prepolymer in an amount of about 10 weight percent of said composition and crosslinked with the selected siloxane compound which is 1,1,1,3,5,7,7,7-octamethyltetrasiloxane, said selected siloxane compound being present in an amount of about 0.4 weight percent of said composition; and wherein said interfacial bonding agent is present in an amount of about 0.1 weight percent of the total propellant ingredients.
Claim 6
Dependent Claim
21 words
The composite propellant composition of claim 1 wherein said composition contains an additional binder of hydroxyl-terminated polybutadiene crosslinked with toluene diisocyanate.
Claim 7
Dependent Claim
211 words
The propellant composition of claim 5 and wherein said inorganic oxidizer ammonium perchlorate is present in amounts from about 60 to about 72 weight percent of said composition; said aluminum metal fuel is powdered and said aluminum powder is present in amounts from about 5 to about 20 weight percent of said composition; said burning rate catalyst of n-butylferrocene is present in amounts from about 0.5 to about 3.0 weight percent of said composition; said iron linoleate is present in amounts from about 0.1 to about 0.3 weight percent of said composition; said hydroxyl-terminated polybutadiene is present in amounts from about 5 to about 10 percent by weight of said composition; said toluene diisocyanate is present in amounts from about 0.5 to about 2.0 percent by weight of said composition; said polybutadiene prepolymer is present in amounts from about 5 to about 10 percent by weight of said composition; said selected siloxane compound is selected from the group consisting of 1,1,3, 3-tetramethyldisiloxane and 1,1,1,3,5,7,7,7-octamethyltetrasiloxane and is present in amounts from about 0.3 to about 2.0 percent by weight of said composition; and said composition additionally containing an interfacial bonding agent, as an additive, in the amount of from about 0.05 to about 1.0 percent by weight of the total propellant ingredients.
Claim 8
Dependent Claim
195 words
The propellant composition of claim 6 and wherein said inorganic oxidizer ammonium perchlorate is a blend of 200 micron size, 67 parts, and 20 micron particle size, 33 parts, said blended ammonium perchlorate being present in an amount of about 66 percent by weight of said composition; said aluminum metal fuel is present in an amount of about 16 percent by weight of said composition; said burning rate catalyst of n-butylferrocene is present in an amount of about 2.5 percent by weight of said composition; said iron linoleate is present in an amount of about 0.1 percent by weight of said composition; said polybutadiene prepolymer is present in an amount of about 7 percent by weight of said composition; said selected siloxane compound is 1,1,3,3-tetramethyldisiloxane which is present in an amount of about 0.4 percent by weight of said composition; said hydroxyl-terminated polybutadiene is present in an amount of about 7 percent by weight of said composition; said toluene diisocyanate is present in an amount of about 1.0 percent by weight of said composition; and said interfacial bonding agent is present in an amount of about 0.1 percent by weight of the total propellant ingredients.
References Cited (Backward Citations)
US3551225A
Cited
US3399088A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |