US4663065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elastomer insulation compositions for rocket motors
Assignee: Hercules LLC
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Filing: 1984-12-10
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Granted: 1987-05-05
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Expires: 2004-12-10
Abstract
Abstract Non-asbestos elastomeric insulation materials for rocket motors are disclosed. The insulation materials comprise 100 parts by weight of a crosslinked elastomer polymer and between about 10 and 100 (preferably 15-75) parts by weight of an organic fiber selected from cotton flock, Sisal and a combination of cotton flock and Sisal. The insulation materials have notable erosion resistance and can be tailored to have thermal, mechanical and other properties of desired character. The organic fiber advantageously functions as a char forming, low density filler. Other ingredients such as silica, phenolic resin, polybutadiene etc. are included to enhance the utility of the insulation materials.
Inventors
- 👤 Liles G. Herring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:04
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/08; F02K9/32; F02K9/34; F02K9/346; C; C08; C08K; C08K3/00; C08K3/01; C08K3/016; C08K3/18; C08K3/20; C08K3/22; C08K3/2279; C08K5/00; C08K5/04; C08K5/14; C08K7/00; C08K7/02; C08L; C08L1/00; C08L23/00; C08L23/02; C08L23/16; C08L9/00; C08L2205/00; C08L2205/03; C08L2312/00; C08L2666/00; C08L2666/02; C08L2666/26; Y; Y10; Y10S; Y10S428/00; Y10S428/92
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
128 words
A non-asbestos elastomeric insulation material in a shape of an interior portion of a rocket motor, said insulation material consisting essentially of: (A) 100 parts of a crosslinkable elastomer comprising EPDM having a Mooney Viscosity, ML-4 at 212° F. between about 25 and 60; (B) About 10-60 parts by weight of a char-forming organic fiber selected from the group consisting of cotton flock, Sisal and a combination of cotton flock and Sisal; (C) About 10-40 parts by weight of an inorganic flame retardant selected from silica, antimony oxide and hydrated alumina; (D) About 20-60 parts by weight of an organic flame retardant selected from chlorinated organic compounds; (E) About 10-5 parts by weight of a peroxide crosslinking agent; and (F) About 0-15 parts by weight of liquid polybutadiene.
Claim 2
Dependent Claim
128 words
A non-asbestos elastomeric insulation material in a shape of an interior portion of a rocket motor, said insulation material consisting essentially of: (A) 100 parts of a crosslinkable elastomer comprising EPDM having a Mooney Viscosity, ML-4 at 212° F. between about 25 and 60; (B) About 10-60 parts by weight of a char-forming organic fiber selected from the group consisting of cotton flock, Sisal and a combination of cotton flock and Sisal; (C) About 10-40 parts by weight of an inorganic flame retardant selected from silica, antimony oxide and hydrated alumina; (D) About 20-60 parts by weight of an organic flame retardant selected from chlorinated organic compounds; (E) About 10-5 parts by weight of a peroxide crosslinking agent; and (F) About 0-15 parts by weight of liquid polybutadiene.
Claim 3
Dependent Claim
17 words
The insulation material in accordance with claim 1, wherein said char-forming fiber consists essentially of cotton flock.
Claim 4
Dependent Claim
19 words
The insulation material in accordance with claim 2, wherein said shape comprises that of a rocket motor blast tube.
Claim 5
Dependent Claim
19 words
The insulation material in accordance with claim 2, wherein said shape comprises that of a rocket motor case wall.
Claim 6
Dependent Claim
18 words
The insulation material in accordance with claim 3, wherein said inorganic flame retardant consists essentially of antimony oxide.
Claim 7
Dependent Claim
18 words
The insulation material in accordinace with claim 4, wherein said inorganic flame retardant consists essentially of antimony oxide.
Claim 8
Dependent Claim
23 words
A non-asbestos elastomeric insulation material in a shape of an interior portion of a rocket motor case, said insulation material consisting essentially of:
Claim 9
Dependent Claim
23 words
A non-asbestos elastomeric insulation material in a shape of an interior portion of a rocket motor case, said insulation material consisting essentially of:
Claim 10
Dependent Claim
7 words
(A) 100 parts by weight chlorosulfonated polyethylene;
Claim 11
Dependent Claim
7 words
(A) 100 parts by weight chlorosulfonated polyethylene;
Claim 12
Dependent Claim
24 words
(B) About 10-100 parts by weight of a char-forming organic fiber selected from cotton flock, Sisal and a combination of cotton flock and Sisal;
Claim 13
Dependent Claim
24 words
(B) About 10-100 parts by weight of a char-forming organic fiber selected from cotton flock, Sisal and a combination of cotton flock and Sisal;
Claim 14
Dependent Claim
7 words
(C) About 10-150 parts by weight starch;
Claim 15
Dependent Claim
7 words
(C) About 10-150 parts by weight starch;
Claim 16
Dependent Claim
8 words
(D) About 5-60 parts by weight antimony oxides;
Claim 17
Dependent Claim
8 words
(D) About 5-60 parts by weight antimony oxides;
Claim 18
Dependent Claim
15 words
(E) About 10-80 parts by weight of an organic flame retardant selected from chloronated hydrocarbons;
Claim 19
Dependent Claim
15 words
(E) About 10-80 parts by weight of an organic flame retardant selected from chloronated hydrocarbons;
Claim 20
Dependent Claim
9 words
(F) About 1-10 parts by weight magnesium oxide; and
Claim 21
Dependent Claim
9 words
(F) About 1-10 parts by weight magnesium oxide; and
Claim 22
Dependent Claim
9 words
(G) About 0.5-5 parts by weight of an accelerator.
Claim 23
Dependent Claim
9 words
(G) About 0.5-5 parts by weight of an accelerator.
Claim 24
Dependent Claim
16 words
The insulation material in accordance with claim 7, wherein said char-forming organic fiber comprises cotton flock.
Claim 25
Dependent Claim
19 words
The insulation material in accordance with claim 8, wherein said shape comprises that of a rocket motor case wall.
Claim 26
Dependent Claim
15 words
The insulation material in accordance with claim 8, wherein said accelerator is a sulfur accelerator.
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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) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |