Copolymerized bis-(ethylene oxy) methane polysulfide polymer and hydroxyl terminated poly butadiene as a solid fueled ramjet fuel

Patent metadata

Field	Value
Publication number	US-10591950-B2
Application number	US-201715491433-A
Country	US
Kind code	B2
Filing date	Apr 19, 2017
Priority date	Apr 19, 2017
Publication date	Mar 17, 2020
Grant date	Mar 17, 2020

Abstract

The application relates to a Ramjet solid fuel having an ignition temperature of less than 400° C., the fuel comprising a bis-(ethylene oxy) methane polysulfide polymer (BMPP) and hydroxyl-terminated polybutadiene (HTPB), the copolymer having a BMPP/HTPB weight ratio of from 1/3 to 3/1; and the fuel comprising at least 85 weight % copolymer. The BMPP comprises from 5 to 8 weight percent mercaptan. Furthermore, the BMPP is selected from

HS(RSS) a CH 2 CH((SSR) c CSH)CH 2 (SSR) b SH  a)
where R═—(CH 2 ) 2 OCH 2 O(CH 2 ) 2 — and a+b+c<7; and

H(SC 2 H 4 OCH 2 OC 2 H4S) n H where n =7.  b)

First claim

What is claimed is:

1. A Ramjet solid fuel having an ignition temperature of less than 400° C., the fuel consisting essentially of a copolymer of bis-(ethylene oxy) methane polysulfide polymer (BMPP) and hydroxyl-terminated polybutadiene (HTPB); isophorone diisocyanate (IDPI); and butyltin; the copolymer having a BMPP/HTPB weight ratio of from 1/3 to 3/1; and the fuel thus consisting essentially of between 83 and 87 weight % copolymer, between 11 and 16 weight % IPDI (Isophorone diisocyanate), and between 0 and 2% butyltin;
wherein the BMPP comprises from 5 to 8 weight percent mercaptan;
and wherein BMPP is selected from
HS(RSS) a CH 2 CH((SSR) c CSH)CH 2 (SSR) b SH  a)

Where R═—(CH 2 ) 2 OCH 2 O(CH 2 ) 2 —
And a+b+c<7; and
H(SC 2 H 4 OCH 2 OC 2 H4S) n H  b)

Where n=7.

2. The Ramjet solid fuel according to claim 1 , wherein the ignition temperature is less than 312° C.

Assignees

• Us Army

Inventors

• Mcdonald Brian
• Rice Jeremy
• Stewart John

Classifications

• C10L2200/0259

  Nitrogen containing compounds · CPC title

• F02K7/105

  using a solid fuel · CPC title

• C10L2270/04

  for turbines, planes, power generation · CPC title

• C10L2200/0263

  Sulphur containing compounds · CPC title

• C10L5/406

  on plastic · CPC title