A propellant is disclosed, comprising, as binder, an ethylene copolymer
especially ethylene/vinyl acetate copolymer. The binder may be
silane-grafted and moisture curable. A solid propellant composition may
contain a plasticizer that is solid or semi-solid at 20.degree. C., and an
additive to increase one or more of elongation, adhesion and tack.
Examples of the solid or semi-solid plasticizer are selected from
microcrystalline wax, macrocrystalline wax, an oxidized hydrocarbon
polyolefin and a polyketone wax. Examples of the additive are selected
from an aliphatic hydrocarbon, an aromatic, a hydrogenated hydrocarbon
resin and a derivative of a rosin. Preferably, the binder composition
contains 10-30% by weight of liquid plasticizer, 0-30% by weight of solid
or semi-solid plasticizer and 20-40% by weight of at least one said
additive. The propellant is particularly useful as a rocket propellant. A
method of manufacture is disclosed.
