Water-in-oil emulsion explosive containing entrapped gas

Claim 1

A cap-sensitive water-in-oil emulsion explosive composition comprising: a. about 1 to about 10 percent of a water-immiscible, emulsifiable carbonaceous fuel liquifiable at a temperature up to about 200* F., selected from the group consisting of petrolatum, microcrystalline, paraffin, mineral, animal, and insect waxes, petroleum oils, and vegetable oils; b. about 55 to about 87 percent of an oxidizer comprising about 20 to about 95 percent ammonium nitrate, about 5 to about 40 percent of an other inorganic nitrate, up to about 60 percent ethylene diamine dinitrate, up to about 40 percent alkylamine nitrate or alkanolamine nitrate, and up to about 30 percent inorganic chlorate or perchlorate; c. about 10 to about 25 percent water; d. about one-half to about 2 percent water-in-oil emulsifier; e. sufficient occluded gas or gas-entrapping material to give the composition a density of about 0.9 to about 1.40 gms./cc.; and f. about 0.1 to about 15 percent of a detonation sensitizer comprising a water-soluble oxide, nitrate, halide, chromate, dichromate, and sulfate compound in which said compound contains a metal selected from the group consisting of aluminum, manganese, cobalt, nickel, lead, silver, mercury, copper, zinc, iron, and chromium.