# US 4,392,895 A · Ramjet fuel

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- Number: US 4,392,895 A
- Document ID: US4392895A
- Status: Granted
- Kind: A
- Application number: 06/319,159
- Filed: 1981-11-09
- Granted: 1983-07-12
- Earliest claimed: 1981-11-09
- Assignees: The United States of America as represented by the Secretary of the Navy
- Inventors: Russell Reed, Jr.; George W. Burdette; Gary W. Meyers; William R. Vuono
- Web page: https://patentgrep.com/patent/US4392895A

## CPC

- C06B 45/10: the organic component containing a resin
- C06B: EXPLOSIVES OR THERMIC COMPOSITIONS (blasting F42D); MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES (compounds in general C01, C07 or C08; {demolition agents based on cementitious or like materials C04B41/0009})

## Abstract

A solid ramjet fuel composition comprising a hydroxyl-terminated or carbo-terminated fluorocarbon binder, a polybutadiene prepolymer, a curative cross-linking compound, and a metal selected from the group consisting of aluminum, zirconium, amorphous boron or magnesium.

## Claims

### Claim 1

A solid ramjet fuel composition comprising a functionally terminated fluorocarbon prepolymer, a functionally terminated polybutadiene prepolymer, a curative cross-linking compound for both prepolymers, and metallic fuel.

### Claim 2 (depends on 1)

A solid ramjet fuel composition according to claim 1, wherein said fluorocarbon prepolymer is selected from the group consisting of hydroxyl-terminated fluorocarbon binder (FCB(HT)) and carboxyl-terminated fluorocarbon binder (FCB(CT)).

### Claim 3 (depends on 2)

A solid ramjet fuel composition according to claim 2, wherein said fluorocarbon prepolymer is FCB(CT), said polybutadiene prepolymer is carboxyl-terminated polybutadiene (CTPB) and said curative cross-linking compound is trifunctional aromatic epoxide.

### Claim 4 (depends on 2)

A solid ramjet fuel composition according to claim 2, wherein said fluorocarbon prepolymer is FCB(HT), said polybutadiene prepolymer is hydroxyl-terminated polybutadiene (HTPB).

### Claim 5 (depends on 4)

A solid ramjet fuel composition according to claim 4, wherein said curative cross-linking compound is selected from the group consisting of dimeryl diisocyanate (DII) and polymethylene polyphenylisocyanate (PAPI).

### Claim 6 (depends on 3, 5)

A solid ramjet fuel composition according to claim 3 or 5, wherein said metallic fuel is selected from the group consisting of aluminum, zirconium, hafnium, amorphous boron, magnesium, and boron carbide.

### Claim 7 (depends on 6)

A solid ramjet fuel according to claim 6, wherein said metallic fuel has a particle size range of from 5 .mu.m to 30 .mu.m.

### Claim 8

A process of producing a solid ramjet fuel composition comprising the steps of:
mixing prepolymers of hydroxyl-terminated fluorocarbon binder (FCB(HT)) and hydroxyl-terminated polybutadiene (HTCB), or carboxyl-terminated fluorocarbon binder (FCB(CT) and carboxyl terminated polybutadiene (CTPB);
mixing said mixed prepolymers with a curative cross-linking compound therefore; and
mixing metallic fuel particles into said mixed prepolymers and curative.

### Claim 9 (depends on 8)

A process of producing a solid ramjet fuel composition according to claim 8 wherein said curative cross-linking compound is selected from the group consisting of dimeryl diisocyanate (DDI) and polymethylene polyphenylisocyanate (PAPI), and said prepolymers are FCB(HT) and HTPB.

### Claim 10 (depends on 8)

A process of producing a solid ramjet fuel composition according to claim 8, wherein said curative compound is trifunctional aromatic epoxide, and said prepolymers are FCB(CT) and CTPB.

### Claim 11 (depends on 8)

A process of producing a solid ramjet fuel composition according to claim 8, wherein the metallic fuel of said metallic fuel particles is selected from the group consisting of aluminum, zirconium, hafnium, amorphous boron, magnesium, and boron carbide.