US4394198A
Expired / Lapsed
US
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Water-in-oil emulsion explosive composition
Assignee: NOF Corp
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Filing: 1981-08-17
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Granted: 1983-07-19
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Expires: 2001-08-17
Abstract
Abstract A water-in-oil emulsion explosive composition having a remarkably improved storage stability in its initiation sensitivity in small diameter cartridges and at low temperatures is disclosed. The explosive composition comprises a disperse phase formed of an aqueous oxidizer solution consisting of (a) ammonium nitrate or a mixture of ammonium nitrate and another oxidizer salt, (b) water and (c) a specifically limited weak acid salt or condensed phosphate; a continuous phase consisting of (d) fuel oil and/or wax; (e) an emulsifier; and (f) hollow microspheres or microbubbles.
Inventors
- 👤 Fumio Takeuchi
- 👤 Masao Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:13
CPC Classifications
C; C06; C06B; C06B47/00; C06B47/14; C06B47/145
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
94 words
A water-in-oil emulsion explosive composition comprising a disperse phase formed of an aqueous oxidizer solution consisting of (a) an inorganic oxidizer salt selected from the group consisting of ammonium nitrate, and a mixture of ammonium nitrate with at least one of sodium nitrate and calcium nitrate, (b) water and (c) at least one member selected from lithium, sodium, potassium, calcium and ammonium salts of weak acid and condensed phosphoric acid; a continuous phase formed of a combustible material consisting of (d) fuel oil and/or wax; (e) an emulsifier; and (f) hollow microspheres or microbubbles.
Claim 2
Dependent Claim
94 words
A water-in-oil emulsion explosive composition comprising a disperse phase formed of an aqueous oxidizer solution consisting of (a) an inorganic oxidizer salt selected from the group consisting of ammonium nitrate, and a mixture of ammonium nitrate with at least one of sodium nitrate and calcium nitrate, (b) water and (c) at least one member selected from lithium, sodium, potassium, calcium and ammonium salts of weak acid and condensed phosphoric acid; a continuous phase formed of a combustible material consisting of (d) fuel oil and/or wax; (e) an emulsifier; and (f) hollow microspheres or microbubbles.
Claim 3
Dependent Claim
25 words
A water-in-oil emulsion explosive composition according to claim 1, wherein said weak acid is carbonic acid, boric acid, acetic acid, silicic acid or citric acid.
Claim 4
Dependent Claim
28 words
A water-in-oil emulsion explosive composition according to claim 1, wherein said hollow microspheres are glass hollow microspheres, silica hollow microspheres, shirasu hollow microspheres or synthetic resin hollow microspheres.
Claim 5
Dependent Claim
34 words
A water-in-oil emulsion explosive composition according to claim 1, wherein said microbubbles are microbubbles formed by decomposing and foaming a chemical foaming agent or microbubbles formed by mechanically blowing air into a water-in-oil emulsion.
Claim 6
Dependent Claim
103 words
A water-in-oil emulsion explosive composition, comprising 40-90% by weight of an inorganic oxidizer salt selected from the group consisting of ammonium nitrate, and a mixture of ammonium nitrate with at least one of sodium nitrate and calcium nitrate, 7.45-28% by weight of water, 0.05-15% by weight of at least one of lithium, sodium, potassium, calcium and ammonium salts of weak acid and condensed phosphoric acid, 1-10% by weight of at least one of fuel oil and wax, 0.5-5% by weight of an emulsifier, and hollow microspheres or microbubbles in an amount sufficient for adjusting the density of the emulsion explosive composition to 0.80-1.35.
Claim 7
Dependent Claim
103 words
A water-in-oil emulsion explosive composition, comprising 40-90% by weight of an inorganic oxidizer salt selected from the group consisting of ammonium nitrate, and a mixture of ammonium nitrate with at least one of sodium nitrate and calcium nitrate, 7.45-28% by weight of water, 0.05-15% by weight of at least one of lithium, sodium, potassium, calcium and ammonium salts of weak acid and condensed phosphoric acid, 1-10% by weight of at least one of fuel oil and wax, 0.5-5% by weight of an emulsifier, and hollow microspheres or microbubbles in an amount sufficient for adjusting the density of the emulsion explosive composition to 0.80-1.35.
Claim 8
Dependent Claim
35 words
A water-in-oil emulsion explosive composition according to claim 5, wherein the amount of at least one of lithium, sodium, potassium, calcium and ammonium salts of weak acid and condensed phosphoric acid is 0.1-5% by weight.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-18 | 1987-01-17 | 1987-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-18 | 1991-01-17 | 1991-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-18 | 1995-01-17 | 1995-07-19 | $7700.00 | Window Closed / Lapsed |