US3948698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid propellant compositions having epoxy cured, carboxy-terminated rubber binder
Assignee: Hercules LLC
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Filing: 1967-09-06
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Granted: 1976-04-06
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Expires: 1987-09-06
Abstract
Abstract Solid propellant compositions wherein the polymeric binder is an all-epoxide cured carboxy-terminated rubber are described. A typical composition contains oxidizer, fuel and a binder formed by curing a carboxy-terminated polybutadiene with a specified mixture of a diepoxide and triepoxide using chromium 2-ethylhexanoate as catalyst.
Inventors
- 👤 Donald E. Elrick
- 👤 Harry Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:29
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/68; C08G59/681; C08G59/685; C06; C06B; C06B45/00; C06B45/04; C06B45/06; C06B45/10; C08K; C08K5/00; C08K5/04; C08K5/09; C08L; C08L13/00; C08L63/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
95 words
A solid propellant composition comprising a solid oxidizer and a polymeric binder formed by reacting an uncured carboxy-terminated rubber with, as sole curing agent, a mixture of difunctional epoxides and trifunctional epoxides wherein the diepoxide:triepoxide mole ratio in said mixture is 15:1 to 1:1, in the presence of a curing catalyst selected from the group consisting of a chromium salt of an aliphatic carbon acid containing 2 to 22 carbon atoms, chromium naphthenate and vanadium naphthenate, the ratio of epoxy groups in said mixture to carboxyl groups in said binder being in substantially stoichiometric proportions.
Claim 2
Dependent Claim
95 words
A solid propellant composition comprising a solid oxidizer and a polymeric binder formed by reacting an uncured carboxy-terminated rubber with, as sole curing agent, a mixture of difunctional epoxides and trifunctional epoxides wherein the diepoxide:triepoxide mole ratio in said mixture is 15:1 to 1:1, in the presence of a curing catalyst selected from the group consisting of a chromium salt of an aliphatic carbon acid containing 2 to 22 carbon atoms, chromium naphthenate and vanadium naphthenate, the ratio of epoxy groups in said mixture to carboxyl groups in said binder being in substantially stoichiometric proportions.
Claim 3
Dependent Claim
25 words
The composition of claim 1 wherein the diepoxide: triepoxide mole ratio of said mixture is 8:1 to 3:1 and the curing catalyst is chromium 2-ethylhexanoate.
Claim 4
Dependent Claim
48 words
The composition of claim 2 comprising by weight of the composition, about 60 to about 95 percent solid oxidizer, about 5 to about 20 percent polymeric binder and 0 to about 20 percent metal fuel, from 0 to about 50 percent by weight of the binder being plasticizer.
Claim 5
Dependent Claim
49 words
The composition of claim 3 comprising, by weight of the composition, about 70 to about 90 percent solid oxidizer, about 5 to about 20 percent polymeric binder and about 5 to about 10 percent metal fuel, from 20 to about 40 percent by weight of the binder being plasticizer.
Claim 6
Dependent Claim
45 words
The composition of claim 4 wherein the solid oxidizer is ammonium perchlorate, the polymeric binder is formed by reacting an uncured carboxy-terminated polybutadiene with as sole curing agent a mixture of the diglycidyl ether of bisphenol A and N,N,O-tris(epoxypropyl)-p-aminophenol and the metal fuel is aluminum.
Claim 7
Independent Claim
97 words
A method for preparing a solid propellant composition which comprises forming a blend of solid oxidizer, uncured carboxy-terminated rubber, and, as sole curing agent, a mixture of difunctional epoxides and trifunctional epoxides having a diepoxide:triepoxide mole ratio of 15:1 to 1:1, the ratio of epoxy groups in said mixture to carboxyl groups in said blend being in substantially stoichiometric proportions, and then curing the blend in the presence of a curing catalyst selected from the group consisting of a chromium salt of an aliphatic carboxylic acid containing 2 to 22 carbon atoms, chromium naphthenate and vanadium naphthenate.
Claim 8
Independent Claim
97 words
A method for preparing a solid propellant composition which comprises forming a blend of solid oxidizer, uncured carboxy-terminated rubber, and, as sole curing agent, a mixture of difunctional epoxides and trifunctional epoxides having a diepoxide:triepoxide mole ratio of 15:1 to 1:1, the ratio of epoxy groups in said mixture to carboxyl groups in said blend being in substantially stoichiometric proportions, and then curing the blend in the presence of a curing catalyst selected from the group consisting of a chromium salt of an aliphatic carboxylic acid containing 2 to 22 carbon atoms, chromium naphthenate and vanadium naphthenate.
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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) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |