US4098626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxy terminated polybutadiene based polyurethane bound propellant grains
Assignee: ATK Launch Systems LLC
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Filing: 1976-11-15
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Granted: 1978-07-04
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Expires: 1996-11-15
Abstract
Abstract Salicylate esters have been found to be suitable blocking agents for polyisocyanates, enabling preparation of hydroxy terminated polybutadiene based polyurethane bound propellant grains having extended pot life. Unblocking occurs readily at normal propellant cure temperatures, allowing normal cure rates.
Inventors
- 👤 William Hardin Graham
- 👤 Inella Gatlin Shepard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:56
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8061; C08G18/8064; C08G18/8067; C06; C06D; C06D5/00; C06D5/06; C08G18/28; C08G18/67; C08G18/69; C08L; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
104 words
A cured hydroxy terminated polybutadiene based polyurethane bound propellant grain wherein the binder and plasticizer comprise the reaction products of a hydroxy terminated polybutadiene and the dissociation products of a compound of the formula: ##STR3## wherein X is an n + m valent organic radical; R is hydrogen or lower alkyl of from 1 to about 10 carbon atoms; R' is lower alkyl of from 1 to about 10 carbon atoms or carbocyclic aryl of from 6 to about 10 carbon atoms; n is on the average at least 1; m is 0 or 1; and n and m must be at least 2.
Claim 2
Dependent Claim
104 words
A cured hydroxy terminated polybutadiene based polyurethane bound propellant grain wherein the binder and plasticizer comprise the reaction products of a hydroxy terminated polybutadiene and the dissociation products of a compound of the formula: ##STR3## wherein X is an n + m valent organic radical; R is hydrogen or lower alkyl of from 1 to about 10 carbon atoms; R' is lower alkyl of from 1 to about 10 carbon atoms or carbocyclic aryl of from 6 to about 10 carbon atoms; n is on the average at least 1; m is 0 or 1; and n and m must be at least 2.
Claim 3
Dependent Claim
111 words
A process for control of the pot life of a curable hydroxy terminated polybutadiene based polyurethane propellant binder which comprises mixing a hydroxy terminated polybutadiene with a compound of the formula: ##STR4## wherein X is an n + m valent organic radical; R is hydrogen or lower alkyl of from 1 to about 10 carbon atoms; R' is lower alkyl of from 6 to about 10 carbon atoms or carbocyclic aryl of from 6 to about 10 carbon atoms; n is on the average at least 1; m is 0 or 1; and n and m must be at least 2; and maintaining the temperature at about 28° C or below.
Claim 4
Dependent Claim
111 words
A process for control of the pot life of a curable hydroxy terminated polybutadiene based polyurethane propellant binder which comprises mixing a hydroxy terminated polybutadiene with a compound of the formula: ##STR4## wherein X is an n + m valent organic radical; R is hydrogen or lower alkyl of from 1 to about 10 carbon atoms; R' is lower alkyl of from 6 to about 10 carbon atoms or carbocyclic aryl of from 6 to about 10 carbon atoms; n is on the average at least 1; m is 0 or 1; and n and m must be at least 2; and maintaining the temperature at about 28° C or below.
References Cited (Backward Citations)
US3951704A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |