US3984265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite propellants having improved resistance to thermal oxidation
Assignee: Hercules LLC
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Filing: 1968-12-04
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Granted: 1976-10-05
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Expires: 1988-12-04
Abstract
Abstract Composite carboxy terminated polybutadiene (CTPB) rubber base propellants, in which the CTPB inherently contains 2,2'-methylene-bis(4-methyl-6-tert-butyl)phenol (A0-2246) added during CTPB manufacture and antagonistic toward conventional antioxidants added to the CTPB propellant, are provided, which contain a synergistic (see Markush definition) antioxidant mixture highly compatible with the inherently present AO-2246. Invention also provides the antioxidant mixture per se.
Inventors
- 👤 Donald E. Elrick
- 👤 Harry Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:34
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; C08L; C08L63/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
72 words
In a composite propellant in which the rubber base is a carboxy terminated polybutadiene, and said carboxy terminated polybutadiene contains 2,2'-methylene-bis(4-methyl-6-tert-butyl) phenol as an antioxidant therefor, the improvement comprising, as the binder component of said propellant, said carboxy terminated polybutadiene and an epoxy curing agent therefor cured together with a mixture of phenyl-beta-naphthylamine, N,N'-bis(1,4-dimethylpentyl)p-phenylenediamine and at least one of the group consisting of thiodiphenylamine and 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene as an antioxidant for said propellant.
Claim 2
Dependent Claim
72 words
In a composite propellant in which the rubber base is a carboxy terminated polybutadiene, and said carboxy terminated polybutadiene contains 2,2'-methylene-bis(4-methyl-6-tert-butyl) phenol as an antioxidant therefor, the improvement comprising, as the binder component of said propellant, said carboxy terminated polybutadiene and an epoxy curing agent therefor cured together with a mixture of phenyl-beta-naphthylamine, N,N'-bis(1,4-dimethylpentyl)p-phenylenediamine and at least one of the group consisting of thiodiphenylamine and 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene as an antioxidant for said propellant.
Claim 3
Dependent Claim
17 words
A propellant of claim 1 wherein the ingredients of said antioxidant mixture are phenyl-beta-naphthylamine, N,N'-bis(1,4-dimethylpentyl)p-phenylenediamine and thiodiphenylamine.
Claim 4
Dependent Claim
17 words
A propellant of claim 1 wherein the ingredients of said antioxidant mixture are phenyl-beta-naphthylamine, N,N'-bis(1,4-dimethylpentyl)p-phenylenediamine and 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene.
Claim 5
Dependent Claim
14 words
A propellant of claim 1 containing from 5-20 weight percent of said binder component.
Claim 6
Dependent Claim
33 words
A propellant of claim 1 in which said antioxidant mixture contains each of said ingredients in a proportion within the range of from 10-70 parts per 100 parts by weight of said mixture.
Claim 7
Dependent Claim
17 words
A propellant of claim 5 wherein the proportions of each of said ingredients are substantially the same.
Claim 8
Dependent Claim
28 words
A propellant of claim 1 wherein the mole ratio of epoxy groups to carboxy groups introduced into said propellant is within the range of from 0.9:1 to 2:1.
Claim 9
Dependent Claim
19 words
A propellant of claim 1 containing from about 60 to about 90 weight percent of a solid oxidizer component.
Claim 10
Dependent Claim
42 words
A propellant of claim 7 wherein said epoxy curing agent introduced into said propellant is a mixture of difunctional epoxides and trifunctional epoxides, and wherein the mole ratio of the dioxide to trioxide is within the range of from 15:1 to 1:1.
Claim 11
Dependent Claim
13 words
A propellant of claim 8 wherein the solid oxidizer component is ammonium perchlorate.
Claim 12
Dependent Claim
26 words
A propellant of claim 10 containing from 70-90 weight percent of said ammonium perchlorate and from about 5 to 10 weight percent of a metal fuel.
Claim 13
Dependent Claim
33 words
A propellant of claim 2 in which said antioxidant mixture contains each of said ingredients in a proportion within the range of from 10-70 parts per 100 parts by weight of said mixture.
Claim 14
Dependent Claim
17 words
A propellant of claim 12 wherein the proportions of each of said ingredients are substantially the same.
Claim 15
Dependent Claim
30 words
A propellant of claim 12 wherein said binder component contains on a weight basis from 1.0 to 1.5 parts of said 2,2-methylene-bis(4-methyl-6-tert-butyl)phenol per 100 parts of said carboxy terminated polybutadiene.
Claim 16
Dependent Claim
33 words
A propellant of claim 14 wherein said binder component contains, on a weight basis, from 0.5 to 6 parts by weight of said antioxidant mixture per 100 parts of said carboxy terminated polybutadiene.
Claim 17
Dependent Claim
54 words
A propellant composition of claim 15 containing, on a weight basis, from 70 to 90 percent solid oxidizer, from 2 to 7 percent plasticizer from 5 to 16 percent metal fuel, and from 5 to 20 percent of said binder; and said binder containing from 40 to 95 percent of said carboxy terminated polybutadiene.
Claim 18
Dependent Claim
20 words
A propellant composition of claim 16 wherein said solid oxidizer is ammonium perchlorate, and said metal fuel is particulate aluminum.
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) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |