US3830672A
Expired / Lapsed
US
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Solid porous, coated oxidizer, method of preparation and novel propellant compositions
Assignee: Aerojet Rocketdyne Inc
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Filing: 1966-08-30
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Granted: 1974-08-20
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Expires: 1986-08-30
Abstract
Abstract A rocket propellant composition having an exceptionally high burning rate may be prepared by incorporating therein an oxidizing salt which comprises at least in part an ammonium salt characterized by a porous structure.
Inventors
- 👤 E Lista
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:42
CPC Classifications
C; C06; C06B; C06B45/00; C06B45/18; C06B45/30; C06B45/32; Y; Y10; Y10S; Y10S149/00; Y10S149/119; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998; Y10T428/31504; Y10T428/31855; Y10T428/31931
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
53 words
An improved solid oxidizer comprising a particulate porous ammonium inorganic salt characterized by an average individual particle density of 1.2 to 1.75 grams per cubic centimeter and a compatible coating over the external surface thereof, said coating substantially sealing the exterior openings of the pores of the ammonium salt without filling such pores.
Claim 2
Dependent Claim
26 words
An oxidizer in accordance with claim 2 wherein the ammonium inorganic salt is selected from the group consisting of a chromate, permanganate, nitrate, chlorate, and perchlorate.
Claim 3
Dependent Claim
30 words
An oxidizer in accordance with cLaim 2 wherein the ammonium inorganic salt particles are generally spherical and have an average particle diameter within the range of 5 to 4,000 microns.
Claim 4
Dependent Claim
29 words
An oxidizer in accordance with claim 2 wherein the ammonium salt particles are generally spherical and have an average particle diameter within the range of 5 to 250 microns.
Claim 5
Dependent Claim
17 words
An oxidizer in accordance with claim 2 wherein the coating is formed of an organic polymeric material.
Claim 6
Dependent Claim
21 words
An oxidizer in accordance with claim 6 wherein the oxidizer particles are coated with an alkylene imine adduct of divinyl benzene.
Claim 7
Dependent Claim
21 words
An oxidizer in accordance with claim 2 wherein the coating comprises 3 to 8 percent by weight of the ammonium salt.
Claim 8
Dependent Claim
29 words
An oxidizer in accordance with claim 2 wherein the inorganic salt is ammonium perchlorate and the salt has a bulk density of 0.6 to 1.0 grams per cubic centimeter.
Claim 9
Dependent Claim
59 words
A process of forming an improved solid oxidizer comprising: effecting a partial decomposition of a particulate inorganic ammonium salt through heating to achieve a porous structure; and thereafter coating the porous particulate ammonium salt, said coating being compatible with the ammonium salt and substantially sealing the exterior openings of the pores of the ammonium salt without filling such pores.
Claim 10
Dependent Claim
81 words
A process of forming an improved solid oxidizer comprising: effecting a partial decomposition of a particulate inorganic ammonium salt through heating at a temperature within the range of 200* to 350*C to achieve a porous structure and a weight loss within the range of about 20 to about 35; and thereafter coating the porous particulate ammonium salts with a compatible organic polymeric material, said coating substantially sealing the exterior openings of the pores of the ammonium salt without filling such pores.
Claim 11
Dependent Claim
18 words
A process in accordance with claim 11 wherein the coating is an alkylene imine adduct of divinyl benzene.
Claim 12
Dependent Claim
21 words
A process in accordance with claim 12 wherein the alkylene imine adduct is the adduct of ethylene imine and divinyl benzene.
Claim 13
Dependent Claim
57 words
A process in accordance with claim 12 wherein the coating is achieved by immersing the porous ammonium salt particles in a hydrocarbon solution of the alkylene imine adduct, whereby the adduct is extracted from the solution onto the porous ammonium salt particles and polymerized on the surface thereof, said ammonium salt serving to catalyze the polymerization reaction.
Claim 14
Dependent Claim
23 words
A process in accordance with claim 12 wherein the hydrocarbon solution contains in addition to the alkylene imine adduct a non-volatile, functional-terminated polybutadiene.
Claim 15
Dependent Claim
25 words
A process in accordance with claim 11 wherein the ammonium salt is selected from the group consisting of a chromate, permanganate, nitrate, chlorate, and perchlorate.
Claim 16
Dependent Claim
14 words
A process in accordance with claim 11 wherein the ammonium salt is ammonium perchlorate.
Claim 17
Dependent Claim
29 words
A process in accordance with claim 11 wherein the ammonium salt particles are generally spherical and have an average diameter within the range of about 5 to 800 microns.
Claim 18
Dependent Claim
27 words
A process in accordance with claim 11 wherein the porous particulate ammonium salt prior to coating is degassed in a substantial vacuum to remove residual decomposition products.
Claim 19
Dependent Claim
27 words
A process in accordance with claim 11 wherein the porous ammonium salt is characterized by an average individual particle density of 1.35 to 1.65 per cubic centimeter.
Claim 20
Dependent Claim
26 words
A process in accordance with claim 11 wherein the porous ammonium salt is characterized by a bulk density of 0.75 to 0.9 grams per cubic centimeter.
Claim 21
Dependent Claim
22 words
A process in accordance with claim 11 wherein the polymeric coating comprises 3 to 8 percent by weight of the ammonium salt.
Claim 22
Dependent Claim
51 words
A solid propellant composition comprising a cured intimate mixture of a resin binder and an inorganic particulate oxidizer salt, said oxidizer salt comprising At least in part a porous ammonium salt characterized by voids throughout and present in an amount effective to significantly increase the burning rate of the propellant composition.
Claim 23
Dependent Claim
22 words
A solid propellant composition in accordance with claim 23 wherein the porous ammonium salt comprises a minor portion of the oxidizer salt.
Claim 24
Dependent Claim
27 words
A propellant composition in accordance with claim 23 wherein the porous ammonium salt comprises by weight about 7 to about 28 percent of the total oxidizer salt.
Claim 25
Dependent Claim
25 words
A propellant composition in accordance with claim 23 wherein the ammonium salt is selected from the group consisting of chromate, permanganate, nitrate, chlorate, and perchlorate.
Claim 26
Dependent Claim
29 words
A propellant composition in accordance with claim 23 wherein the porous ammonium salt used in the compound has a bulk density of 0.75 to 0.9 grams per cubic centimeter.
Claim 27
Dependent Claim
69 words
A solid propellant composition which comprises a cured intimate mixture of resin binder and a particulate ammonium inorganic oxidizer salt, said oxidizer salt comprising at least in part a porous ammonium salt characterized by an average individual particle density within the range of 1.35 to 1.65 gams per cubic centimeter, said porous salt being present in an amount effective to significantly increase the burning rate of the propellant composition.
Claim 28
Dependent Claim
26 words
A solid propellant composition in accordance with claim 28 wherein the porous ammonium salt comprises a minor portion by weight of the total ammonium salt content.
Claim 29
Dependent Claim
34 words
A solid propellant composition in accordance with claim 28 wherein the porous ammonium salt comprises from about 7 to about 28 percent by weight of the total ammonium salt content of the propellant composition.
Claim 30
Dependent Claim
27 words
A propellant composition in accordance with claim 28 wherein the ammonium inorganic salt is selected from the group consisting of a chromate, permanganate, nitrate, chlorate, and perchlorate.
Claim 31
Dependent Claim
21 words
A solid propellant composition in accordance with claim 28 wherein the porous ammonium salt has a coating over the surface thereof.
Claim 32
Dependent Claim
22 words
A solid propellant composition in accordance with claim 32 wherein the coating on the porous ammonium salt is an organic polymeric material.
Claim 33
Dependent Claim
21 words
A solid propellant composition in accordance with claim 33 wherein the polymeric coating is an alkylene imine adduct of divinyl benzene.
Claim 34
Dependent Claim
26 words
A solid propellant composition in accordance with claim 28 wherein the resin binder is the reaction product of a functional-terminated polydiolefin and an imine curing agent.
Claim 35
Dependent Claim
43 words
A solid propellant composition comprising an inorganic particulate oxidizer salt, said oxidizer salt comprising at least in part a porous ammonium inorganic salt characterized by a cubicle crystal structure and a reducing agent comprising a resin binder for reaction with said oxidizer salt.
Claim 36
Dependent Claim
32 words
A solid propellant composition in accordance with claim 36 wherein the porous ammonium inorganic salt has an average individual particle density within the range of 1.2 to 1.75 grams per cubic centimeter.
Claim 37
Dependent Claim
17 words
A solid propellant composition in accordance with claim 36 wherein the ammonium inorganic salt is ammonium perchlorate.
Claim 38
Dependent Claim
23 words
A solid propellant composition in accordance with claim 36 wherein the porous ammonium salt has a compatible polymeric coating over the surface thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |