US4130449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thickened aqueous slurry explosive compositions
Assignee: Orica Explosives Technology Pty Ltd
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Filing: 1978-05-22
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Granted: 1978-12-19
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Expires: 1998-05-22
Abstract
Abstract A thickened, aqueous slurry explosive composition containing a soluble organic nitrate sensitizer is provided which has improved rheological properties. Use in the composition as a thickener, of a mixture of an unmodified guar gum and a hydroxypropyl-modified guar gum provides a composition which retains flowability for an hour or more for easy extrusion packaging yet achieves a high level of gel strength and cartridge rigidity within a day after packaging.
Inventors
- 👤 Joseph F. M. Craig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:40
CPC Classifications
C; C06; C06B; C06B47/00; C06B47/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
61 words
In a slurry explosive composition containing water, inorganic oxidizer salt, fuel, thickener, thickener cross-linker and, as a sensitizer, a soluble organic nitrate, the improvement comprising a thickener consisting essentially of a combination of unmodified guar gum and hydroxypropyl-modified guar gum, which thickener provides slurry composition viscosities suitable for extrusion packaging and which develops post-packaging viscosities resulting in firm, shape-retaining, tampable cartridges.
Claim 2
Dependent Claim
61 words
In a slurry explosive composition containing water, inorganic oxidizer salt, fuel, thickener, thickener cross-linker and, as a sensitizer, a soluble organic nitrate, the improvement comprising a thickener consisting essentially of a combination of unmodified guar gum and hydroxypropyl-modified guar gum, which thickener provides slurry composition viscosities suitable for extrusion packaging and which develops post-packaging viscosities resulting in firm, shape-retaining, tampable cartridges.
Claim 3
Dependent Claim
46 words
An explosive composition as claimed in claim 1 wherein the thickener comprises from 0.2% to 2.0% by weight of the total composition in the ratio of from 15 to 85 parts by weight of unmodified guar to 85 to 15 parts by weight of hydroxypropyl-modified guar.
Claim 4
Dependent Claim
22 words
An explosive composition as claimed in claim 2 wherein the thickener comprises from 0.4% to 1.6% by weight of the total composition.
Claim 5
Dependent Claim
87 words
A thickened and cross-linked water-bearing explosive slurry composition comprising up to 75% by weight of inorganic oxygen-supplying salt, up to 25% by weight of water, from 10% to 31% by weight of soluble organic nitrate sensitizer, up to 40% by weight of fuel, from 0.2% to 2.0% by weight of a thickener comprising a mixture of from 15 to 85 parts by weight of unmodified guar gum to 85 to 15 parts by weight of hydroxypropyl-modified guar gum and up to 1.0% by weight of thickener cross-linker.
Claim 6
Dependent Claim
87 words
A thickened and cross-linked water-bearing explosive slurry composition comprising up to 75% by weight of inorganic oxygen-supplying salt, up to 25% by weight of water, from 10% to 31% by weight of soluble organic nitrate sensitizer, up to 40% by weight of fuel, from 0.2% to 2.0% by weight of a thickener comprising a mixture of from 15 to 85 parts by weight of unmodified guar gum to 85 to 15 parts by weight of hydroxypropyl-modified guar gum and up to 1.0% by weight of thickener cross-linker.
Claim 7
Dependent Claim
23 words
An explosive composition as claimed in claim 4 wherein up to 27% of the total amount of inorganic oxygen-supplying salt comprises calcium nitrate.
Claim 8
Dependent Claim
28 words
An explosive composition as claimed in claim 4 wherein the soluble organic nitrate sensitizer is selected from the groups consisting of hydroxyalkyl nitrate, alkanolamine nitrate and alkylamine nitrate.
References Cited (Backward Citations)
US3748201A
Cited
US3730790A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-18 | 1982-06-19 | 1982-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-18 | 1986-06-19 | 1986-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-18 | 1990-06-19 | 1990-12-19 | $7700.00 | Window Closed / Lapsed |