US4043850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric-coated HMX crystals for use with propellant materials
Assignee: United States Department of the Navy
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Filing: 1976-08-06
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Granted: 1977-08-23
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Expires: 1996-08-06
Abstract
Abstract The adhesion of HMX crystals to the binder of a propellant material is significantly improved by providing a polymeric polyurethane coating. The HMX crystals are tumbled in benzene to which is added a dilute solution of poly-aryl phenylisocyanate in methylene chloride, water and triethylamine. A secondary coating then may be applied by reacting residual isocyanates with ethanol.
Inventors
- 👤 Richard E. Hoffman
- 👤 Edward K. Lindsay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:58
CPC Classifications
C; C06; C06B; C06B45/00; C06B45/18; C06B45/20; C06B45/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
66 words
A propellant composition comprising: a binder material, a propellant material, and a crystalline oxidizer fuel, said binder and material and said fuel being incorporated in said propellant material and said oxidizer fuel consisting of: cyclotetramethylenetetranitramine (HMX) crystals having a dry film polyurethane primary coating formed on the crystals by catalytically reacting a solution of a poly-aryl isocyanate with water to an isocyanate-to-hydroxyl ratio of about 3:1.
Claim 2
Dependent Claim
66 words
A propellant composition comprising: a binder material, a propellant material, and a crystalline oxidizer fuel, said binder and material and said fuel being incorporated in said propellant material and said oxidizer fuel consisting of: cyclotetramethylenetetranitramine (HMX) crystals having a dry film polyurethane primary coating formed on the crystals by catalytically reacting a solution of a poly-aryl isocyanate with water to an isocyanate-to-hydroxyl ratio of about 3:1.
Claim 3
Dependent Claim
29 words
The oxidizer-fuel of claim 1 further including a secondary coating formed by reacting residual isocyanates present in said primary coating with ethanol to a final stoichiometry of about 1.0.
Claim 4
Dependent Claim
59 words
The oxidizer-fuel of claim 2 wherein: said primary coating is reactively formed on said crystals by tumbling said HMX crystals in a dilute solution of poly-aryl isocyanate and methylene chloride and by mixing the HMX slurry with dry benzene, triethylamine and a wet benzene, and said secondary coating is formed by mixing said primary-coated crystals in an ethanol solution.
Claim 5
Dependent Claim
14 words
The composition of claim 1 wherein said propellant material is a slurry-cast double-bond material.
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) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |