Propellant compositions with nitrocellulose and a polymer
AssigneeRoyal Ordnance plc
InventorsGeoffrey Ian Evans, Denis Facer, Michael J. Ruston
Life of this patent
Estimating the term…
Abstract
A rubbery polymer is produced in situ in a cast double base propellant composition.
Claims26
A process for making a multiple base propellant which comprises bringing together nitrocellulose, an energetic liquid plasticiser for the nitrocellulose and one or more polymerisable components that can be polymerised in situ to produce an elastomer imparting rubbery properties to the composition, and effecting polymerisation of said component(s), the nitrocellulose content of the propellant being less than about 30% by weight.
A base grain casting process for making a multiple base propellant comprising the steps of placing grains comprising nitrocellulose in a mould, pouring into the mould an energetic liquid plasticiser for the nitrocellulose, said plasticiser containing one or more polymerisable components that can be polymerised to form an elastomer, and effecting polymerisation of said component(s), the nitrocellulose content of the composition being less than about 30% by weight.
A multiple base composition having a matrix comprising
- (a) nitrocellulose but in an amount of less than about 30% by weight;
- and
- (b) a polymer comprising polyurethane or polymerized aliphatic acrylate elastomer which is substantially unreacted with the nitrocellulose.
Dependencies are inferred from the claim text.