Moldable compositions comprising polyvinyl nitrate

Explosive and thermic compositions or charges – Structure or arrangement of component or product – Solid particles dispersed in solid solution or matrix

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149 199, 149 1991, 149100, 149 96, 102 38, 102DIG1, C06B 4510

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active

040239969

ABSTRACT:
A mouldable thermoplastic composition comprises (i) polyvinyl nitrate, (ii) nitrocellulose and/or polyvinyl acetate and (iii) 2-nitro-diphenylamine and may be used to form combustible articles such as cartridge cases. Preferably, the composition comprises from 30 to 90% by weight of polyvinyl nitrate based on the total weight of components (i) and (ii). The composition may comprise up to about 30% by weight, based on the weight of components (i) and (ii), of at least one additive selected from cellulose acetate, dinitrotoluene, phthalates, non-volatile esters, heterocyclic ketones, ureas and ABS copolymers.
The combustible articles may be formed by compression moulding or injection moulding. Preferably the mouldable composition is formed into granules using the "with solvent" technique for making single base propellants, and the granules are mixed with a porous powder comprising nitrocellulose prior to being moulded to form the combustible article.

REFERENCES:
patent: 2990263 (1961-06-01), Avery
patent: 3006743 (1961-10-01), Fox et al.
patent: 3078200 (1963-02-01), Preckel
patent: 3639183 (1972-02-01), Crescenzo et al.
patent: 3658008 (1972-04-01), Larson
patent: 3669924 (1972-06-01), Daume et al.
patent: 3676233 (1972-07-01), Netzer et al.
patent: 3779820 (1973-12-01), Stevely et al.
patent: 3911825 (1975-10-01), Gawlick et al.
Akiyama et al., Chem. Abs., 72, Abs. No. 3982m (1970).
Daume et al., Chem. Abs., 72, Abs. No. 134,820n (1970).

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