US4110135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of cure rate of polyurethane resin based propellants
Assignee: ATK Launch Systems LLC
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Filing: 1976-11-11
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Granted: 1978-08-29
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Expires: 1996-11-11
Abstract
Abstract Curing catalysts comprising organo metallic compounds, and carboxylic acids or compounds convertible thereto, processes for their use and compositions containing them are disclosed. The compositions enable the control of the curing rate profile of hydroxy terminated polybutadiene based urethane propellant binders, and the cure rate profile of polyurethane resin systems generally.
Inventors
- 👤 William H. Graham
- 👤 Inella G. Shepard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:55
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/161; C06; C06B; C06B45/00; C06B45/04; C06B45/06; C06B45/10; C08G18/089; C08G18/28; C08G18/67; C08G18/69
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
70 words
A process for the control of the pot life and curing rate of a hydroxy terminated polybutadiene based polyurethane bound propellant grain which comprises, admixing with a propellant grain containing an uncured binder based upon a hydroxy terminated polybutadiene and a polyisocyanate, a catalyst, said catalyst comprising a metallo organic compound and either a carboxylic acid or a compound convertible to a carboxylic acid by reaction with Zerewitinoff active hydrogen.
Claim 2
Dependent Claim
70 words
A process for the control of the pot life and curing rate of a hydroxy terminated polybutadiene based polyurethane bound propellant grain which comprises, admixing with a propellant grain containing an uncured binder based upon a hydroxy terminated polybutadiene and a polyisocyanate, a catalyst, said catalyst comprising a metallo organic compound and either a carboxylic acid or a compound convertible to a carboxylic acid by reaction with Zerewitinoff active hydrogen.
Claim 3
Dependent Claim
46 words
A cured hydroxy terminated polybutadiene based polyurethane bound propellant grain which contains the reaction products of a cure catalyst, said cure catalyst comprising a metallo organic compound and either a carboxylic acid or a compound convertible to a carboxylic acid by reaction with Zerewitinoff active hydrogen.
Claim 4
Dependent Claim
46 words
A cured hydroxy terminated polybutadiene based polyurethane bound propellant grain which contains the reaction products of a cure catalyst, said cure catalyst comprising a metallo organic compound and either a carboxylic acid or a compound convertible to a carboxylic acid by reaction with Zerewitinoff active hydrogen.
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) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |