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A gas-retaining agent consisting of bubble assemblies, each bubble assembly being one particle consisting of a large number of bubbles agglomerated into the particle, is effective for improving the safety of water-in-oil emulsion explosive compositions against methane and coal dust, for improving th

A gas-retaining agent consisting of bubble assemblies, each bubble assembly being one particle consisting of a large number of bubbles agglomerated into the particle, is effective for improving the safety of water-in-oil emulsion explosive compositions against methane and coal dust, for improving the sympathetic detonability of the explosive compositions and for lowering their detonation velocity without deteriorating their strength.

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1. In a water-in-oil emulsion explosive composition comprising a continuous phase consisting of a carbonaceous fuel component; a disperse phase consisting of an aqueous solution of inorganic oxidizer salt; an emulsifier and a gas-retaining agent, the improvement comprising the explosive composition

1. In a water-in-oil emulsion explosive composition comprising a continuous phase consisting of a carbonaceous fuel component; a disperse phase consisting of an aqueous solution of inorganic oxidizer salt; an emulsifier and a gas-retaining agent, the improvement comprising the explosive composition containing, as the gas-retaining agent, 0.05-40% by weight based on the total amount of explosive composition of bubble assemblies, each bubble assembly being one particle consisting of a large number of bubbles agglomerated into the particle. 2. A water-in-oil emulsion explosive composition according to claim 1, wherein the gas-retaining agent consists of organic bubble assemblies, each bubble assembly being one particle consisting of a large number of bubbles agglomerated into the particle. 3. A water-in-oil emulsion explosive composition according to claim 2, wherein the gas-retaining agent consists of chip-shaped or globular organic bubble assemblies formed of at least one member selected from the group consisting of foamed polystyrene, foamed polyethylene, foamed polypropylene, foamed polyurethane, foamed polyvinyl chloride and foamed rubber. 4. A water-in-oil emulsion explosive composition according to claim 3, wherein the gas-retaining agent consists of prefoamed particles of foamable polystyrene or/and chips of foamed polystyrene. 5. A water-in-oil emulsion explosive composition according to claim 1, wherein the explosive composition further contains at least one sensitizer selected from the group consisting of monomethylamine nitrate, hydrazine nitrate, ethanolamine nitrate, ethylenediamine dinitrate, urea nitrate, trinitrotoluene and aluminum powder. 6. A water-in-oil emulsion explosive composition according to claim 5, wherein the sensitizer is at least one member selected from the group consisting of monomethylamine nitrate, hydrazine nitrate, ethanolamine nitrate and ethylenediamine dinitrate. 7. A water-in-oil emulsion explosive composition according to claim 6, wherein the sensitizer is hydrazine nitrate. 8. A water-in-oil emulsion explosive composition according to claim 1, wherein the explosive composition further contains, as a flame coolant, at least one of halogenides of alkali metal and alkaline earth metal. 9. A water-in-oil emulsion explosive composition according to claim 8, wherein the flame coolant is sodium chloride. 10. A water-in-oil emulsion explosive composition according to claim 9, wherein the flame coolant is finely divided sodium chloride having a particle size smaller than the 30 mesh sieve opening. 11. A water-in-oil emulsion explosive composition according to claim 1, comprising 1-10% by weight of a carbonaceous fuel, 0.1-10% by weight of an emulsifier, 5-90% by weight of an inorganic oxidizer salt, 3-30% by weight of water, 0.05-40% by weight of a gas-retaining agent, 0-80% by weight of a sensitizer and 0-50% by weight of a flame coolant. 12. A water-in-oil emulsion explosive composition according to claim 11, comprising 1-10% by weight of a carbonaceous fuel, 0.1-10% by weight of an emulsifier, 5-90% by weight of an inorganic oxidizer salt, 3-30% by weight of water, 1-40% by weight of at least one sensitizer selected from the group consisting of monomethylamine nitrate, hydrazine nitrate, ethanolamine nitrate and ethylenediamine dinitrate, 1-40% by weight of sodium chloride as a flame coolant, and 0.1-15% by weight of a gas-retaining agent consisting of chips and/or globes having a particle size of 0.1-5 mm of organic bubble assemblies obtained from at least one member selected from the group consisting of foamed polystyrene, foamed polyethylene, foamed polypropylene, foamed polyurethane and foamed polyvinyl chloride.