US3716604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for bonding solid propellants to rocket motor casing
Assignee: Hercules LLC
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Filing: 1967-05-02
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Granted: 1973-02-13
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Expires: 1987-05-02
Abstract
Abstract The reliability of propellant-case bond adhesion is improved by chemically bonding the propellant binder to the insulator of the rocket motor casing during the propellant cure cycle. Bonding is effected by treating a surface of an uncured elastomeric insulator with a polyfunctional material such as unsaturated alcohols, acids, amines, or isocyanates, curing the insulator, placing uncured propellant against the treated surface, and then curing the propellant in place. Excellent adhesion of nitrocellulose-containing propellants to butadiene-styrene type insulators is demonstrated using undecylenic alcohol as the surface treating material.
Inventors
- 👤 H Dehm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:16
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/08; F02K9/32; F02K9/34; F02K9/346; C; C06; C06B; C06B45/00; C06B45/12; F02K9/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
90 words
A method for chemically bonding a solid propellant to an elastomeric insulator for a rocket motor casing which comprises a. applying to a surface of an uncured elastomeric insulator a coating of a polyfunctional material containing at least one functional group chemically reactive with the elastomer during cure of the elastomer and at least one other functional group chemically reactive with the propellant binder during cure of the propellant, b. curing the insulator, c. placing an uncured propellant against the coated insulator surface, and d. curing the propellant in place.
Claim 2
Independent Claim
90 words
A method for chemically bonding a solid propellant to an elastomeric insulator for a rocket motor casing which comprises a. applying to a surface of an uncured elastomeric insulator a coating of a polyfunctional material containing at least one functional group chemically reactive with the elastomer during cure of the elastomer and at least one other functional group chemically reactive with the propellant binder during cure of the propellant, b. curing the insulator, c. placing an uncured propellant against the coated insulator surface, and d. curing the propellant in place.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the elastomeric insulator is butadiene--styrene rubber and the propellant is a nitrocellulose-containing propellant.
Claim 4
Dependent Claim
12 words
The method of claim 2 wherein the polyfunctional material is undecylenic alcohol.
References Cited (Backward Citations)
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US2985055A
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US3213173A
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US3021748A
Cited
US3215028A
Cited
US3250829A
Cited
US3381614A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |