US3676236A - Method of forming in place a gelled suspension explosive - Google Patents
Method of forming in place a gelled suspension explosive Download PDFInfo
- Publication number
- US3676236A US3676236A US22059A US3676236DA US3676236A US 3676236 A US3676236 A US 3676236A US 22059 A US22059 A US 22059A US 3676236D A US3676236D A US 3676236DA US 3676236 A US3676236 A US 3676236A
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- United States
- Prior art keywords
- water
- place
- weight percent
- forming
- slurry
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000000034 method Methods 0.000 title abstract description 11
- 239000000725 suspension Substances 0.000 title abstract description 11
- 239000002360 explosive Substances 0.000 title abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 18
- 239000000203 mixture Substances 0.000 abstract description 16
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Chemical compound O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 abstract description 8
- ZXAUZSQITFJWPS-UHFFFAOYSA-J zirconium(4+);disulfate Chemical compound [Zr+4].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZXAUZSQITFJWPS-UHFFFAOYSA-J 0.000 abstract description 8
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 abstract description 7
- 239000007864 aqueous solution Substances 0.000 abstract description 6
- 230000001105 regulatory effect Effects 0.000 abstract description 5
- 239000002002 slurry Substances 0.000 description 17
- 239000000499 gel Substances 0.000 description 13
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 12
- 230000035945 sensitivity Effects 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 6
- 235000010299 hexamethylene tetramine Nutrition 0.000 description 6
- 239000004312 hexamethylene tetramine Substances 0.000 description 6
- GDDNTTHUKVNJRA-UHFFFAOYSA-N 3-bromo-3,3-difluoroprop-1-ene Chemical compound FC(F)(Br)C=C GDDNTTHUKVNJRA-UHFFFAOYSA-N 0.000 description 5
- 239000004615 ingredient Substances 0.000 description 5
- 238000005086 pumping Methods 0.000 description 5
- 238000004132 cross linking Methods 0.000 description 4
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 4
- 239000004449 solid propellant Substances 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- 239000003349 gelling agent Substances 0.000 description 3
- 150000004676 glycans Chemical class 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- 229920001282 polysaccharide Polymers 0.000 description 3
- 239000005017 polysaccharide Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000002562 thickening agent Substances 0.000 description 3
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910021538 borax Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 235000010344 sodium nitrate Nutrition 0.000 description 2
- 239000004317 sodium nitrate Substances 0.000 description 2
- 229940001516 sodium nitrate Drugs 0.000 description 2
- 239000004328 sodium tetraborate Substances 0.000 description 2
- 235000010339 sodium tetraborate Nutrition 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 239000004971 Cross linker Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B47/00—Compositions in which the components are separately stored until the moment of burning or explosion, e.g. "Sprengel"-type explosives; Suspensions of solid component in a normally non-explosive liquid phase, including a thickened aqueous phase
- C06B47/14—Compositions in which the components are separately stored until the moment of burning or explosion, e.g. "Sprengel"-type explosives; Suspensions of solid component in a normally non-explosive liquid phase, including a thickened aqueous phase comprising a solid component and an aqueous phase
Definitions
- sensitivity variation problem is solved, as disclosed in the patent, by addition of ammonium perchlorate and the pumping problem was solved by injecting the gelling agent into the exit stream from the pump.
- the aforementioned patent discloses the use of borax to eifect the well-known instantaneous gelling of a hydroxy-substituted polymer by formation of borate chelate ion cross-links between hydroxy groups of adjacent polymer strands.
- the borax gelling effect has been known for over a quarter of a century, being remarkable for the instantaneous speed of reaction and certain physical properties of the gels. (See The Chemorheology of Polyvinyl Alcohol-Borate Gels by R. K. Schultz and R. R. Myers, Macromolecules vol. 2, No. 3, pp.
- borate gels of this type are eroded rapidly by currents of water which are frequently found in deep drill holes. When substantial time elapses between the placement of theexplosive and the setting off of the charge, deterioration may have occurred because of the presence of water in the hole, so that results are unsatisfactory.
- the improvement of the present invention consists of the steps of regulating the pH of the aqueous slurry to a value between 4 and 7 and injecting into the exit stream from the pump a sufficient quantity of an aqueous solution of zirconium sulfate, aluminum sulfate and chromic acid to convert the thickened slurry into a stable, uniform, water-resistant gel.
- the present invention is directed to the problem of deterioration of gelled suspension explosives in drill holes into which water has intruded. This is a problem which is unrelated to variation of sensitivity with temperature; therefore the use of ammonium perchlorate in formation of the gel in place is not essential to the method of which this invention is an improvement.
- the proportions of other ingredients may also be varied considerably without affecting the present method.
- compositions may be pumped and gelled by the present method with varying proportions as listed below:
- a typical composition is made according to the following procedure:
- Step 1-Base solution preparation A typical base solution may be a mixture of the components listed below, heated to 90 F. in preparation for the addition of suspended solids. (For a one ton batch of slurry 1280 lbs.
- Salt point of the above is 7812
- the solution should be kept at a temperature above 80 F., preferably about 90 F.
- 48 lb. of 42 Baum nitric acid is added to the base liquor above.
- the pH will be 5.411 in this specific example. This lies within the preferred range of about 5.0 to 5.8.
- Step 2 The above solution is pumped into a ribbon mixer and there is added about 18 lb. of a commercial polysaccharide gum, for example, General Mills 492 type gum thickener. The mixture is allowed to hydrate for approximately 3 minutes.
- a commercial polysaccharide gum for example, General Mills 492 type gum thickener. The mixture is allowed to hydrate for approximately 3 minutes.
- Step 3.T he required amounts of coarse aluminum and fine aluminum with the balance of ammonium nitrate to make up the 2000 lb. batch is added and the ribbon is turned at the required rate and time to produce the proper mixing and density of final product.
- a solid canbonaceous fuel such as gilsonite may also be added.
- Gilsonite because of difiiculty of dispersion in hydrated (thickened) mixes, is customarily added to some of the solution in the mixer before the gum is added. Final temperature of the finished slurry is usually about to and the pH is about 5.4.
- the slurry product is transferred to bulk pump trucks or support tankers for distribution to blast holes in the field.
- the final step is pumping the bulk slurry into blast holes at a temperature of about 70 to 80 F. while injecting the crosslinking agent on the downstream side of the pump.
- the crosslinker converts the slurry from a sol to a water-resistant gel. This step is described below.
- Crosslinking may be accomplished for example, by injecting into the exit stream from the slurry pump from 1.5 to 2 percent by weight of the slurry a crosslinking solution of the following composition:
- Water erosion resistance of the gel may be varied by adjusting the zirconium sulfate content.
- Pliability or toughness of the gel may be adjusted by varying the chromic acid content. The tendency of water in the blast hole to break down the gel by solubility effects, leaching out the nitrates and carrying away the gilsonite and powdered aluminum in suspension is counteracted by the aluminum sulfate.
- the specifically disclosed crosslinking solution is believed to be about the best compromise for the range of explosive compositions disclosed above. However, it will be understood that for a specific problem situation it may be desirable to increase or decrease water erosion resistance, insolubility or toughness.
- the composition of the crosslinking solution may be varied within the limits shown below;
- particulate aluminum and gilsonite selected from particulate aluminum and gilsonite (d) at least 1 weight percent dissolved hexamethylenetetramine sufficient to improve sensitivity
- a stabilizing amount of a water-soluble hydroxysubstituted thickening agent consisting of regulating the pH of the aqueous slurry to a value between 4 and 7 and injecting into the exit stream from the pump a sufficient quantity 4 of an aqueous solution of zirconium sulfate, aluminum sulfate and chromic acid to convert the thickened slurry into 'a stable, uniform, water-resistant gel.
- particulate aluminum and gilsonite selected from particulate aluminum and gilsonite (d) at least 1 weight percent dissolved hexamethylenetetramine suflicient to improve sensitivity (e) at least 1 weight percent ammonium perchlorate,
- a stabilizing amount of a Water-soluble hydroxysubstituted thickening agent consisting of regulating the pH of the aqueous slurry to a value between 5.0 and 5.8 and injecting into the exit stream from the pump a suflicient quan tity of an aqueous solution of zirconium sulfate, aluminum sulfate and chromic acid to convert the thickened slurry into a stable, uniform, water-resistant gel.
- aqueous slurry is prepared by suspending the undissolved solid ingredients of the composition in an aqueous solution comprising lwater, ammonium nitrate, sodium nit-rate, hexamethylenetetramine, nitric acid and a quantity of a polysaccharide gum suflicient to stabilize the suspension.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Colloid Chemistry (AREA)
Abstract
THE METHOD OF FORMING IN PLACE A STABLE, GELLED SUSPENSION EXPLOSIVE COMPOSITION AS DISCLOSED IN U.S. PAT. 3,409,486 IS IMPROVED BY REGULATING THE PH OF THE COMPOSITION TO A VALUE BETWEEN 4 AND 6 AND INJECTING INTO THE EXIT STREAM FROM THE PUMP AN AQUEOUS SOLUTION OF ZIRCONIUM SULFATE, ALUMINUM SULFATE AND CHROMIC ACID TO YIELD A TOUGHER, MORE WATER RESISTANT GEL.
Description
3,676,236 Patented July 11, 1972 ABSTRACT OF THE DISCLOSURE The method of forming in place a stable, gelled suspension explosive composition as disclosed in US. Pat. 3,409,486 is improved by regulating the pH of the composition to a value between 4 and 6 and injecting into the exit stream from the pump an aqueous solution of zirconium sulfate, aluminum sulfate and chromic acid to yield a tougher, more water resistant gel.
DESCRIPTION OF THE INVENTION US. Pat. 3,409,486 discloses a method of formingin place a stable gelled suspension explosive by pumping into a hole an aqueous slurry comprising:
(a) at least weight percent water,
(b) at least 40 weight percent ammonium nitrate,
(c) at least 0.5 weight percent finely divided solid fuel,
(d) at least 1 weight percent dissolved hexamethylenetetramine, sufficient to improve sensitivity, and
(e) at least 1 weight percent ammonium perchlorate, sufficient to stabilize the composition against variation of sensitivity with changing temperature, followed by injecting a gelling agent into the exit stream from the pump.
The aforementioned patent is directed to problems which arise from variations in temperature conditions, particu larly during severe winters. In very cold weather, gelled suspension explosives become very difficult to pump and the sensitivity may decline with falling temperature. The
sensitivity variation problem is solved, as disclosed in the patent, by addition of ammonium perchlorate and the pumping problem was solved by injecting the gelling agent into the exit stream from the pump.
As a gelling agent, the aforementioned patent discloses the use of borax to eifect the well-known instantaneous gelling of a hydroxy-substituted polymer by formation of borate chelate ion cross-links between hydroxy groups of adjacent polymer strands. The borax gelling effect has been known for over a quarter of a century, being remarkable for the instantaneous speed of reaction and certain physical properties of the gels. (See The Chemorheology of Polyvinyl Alcohol-Borate Gels by R. K. Schultz and R. R. Myers, Macromolecules vol. 2, No. 3, pp. 281-285, May June 1969 for a recent discussion of these gels.) Unfortunately for the present purpose, borate gels of this type are eroded rapidly by currents of water which are frequently found in deep drill holes. When substantial time elapses between the placement of theexplosive and the setting off of the charge, deterioration may have occurred because of the presence of water in the hole, so that results are unsatisfactory.
The improvement of the present invention consists of the steps of regulating the pH of the aqueous slurry to a value between 4 and 7 and injecting into the exit stream from the pump a sufficient quantity of an aqueous solution of zirconium sulfate, aluminum sulfate and chromic acid to convert the thickened slurry into a stable, uniform, water-resistant gel.
The present invention is directed to the problem of deterioration of gelled suspension explosives in drill holes into which water has intruded. This is a problem which is unrelated to variation of sensitivity with temperature; therefore the use of ammonium perchlorate in formation of the gel in place is not essential to the method of which this invention is an improvement. The proportions of other ingredients may also be varied considerably without affecting the present method. By way of illustration,
compositions may be pumped and gelled by the present method with varying proportions as listed below:
Ingredients: Proportions Ammonium nitrate 40-80% Sodium nitrate 0-20% Ammonium perchlorate 02% Hexamethylenetetramine 2-8% Nitric acid (42 Baume'), for each 5 parts of hexamethylenetetramine 3 parts At least 0.5 weight percent of a finely divided solid fuel, selected for example from the following:
Particulate aluminum:
Coarse granular 0-15 Fine powder 0-1.7% Gilsonite 06% Water 820% Polysaccharide gum, suflicient to stabili e the suspension.
A typical composition is made according to the following procedure:
Step 1-Base solution preparation. A typical base solution may be a mixture of the components listed below, heated to 90 F. in preparation for the addition of suspended solids. (For a one ton batch of slurry 1280 lbs.
Salt point of the above is 7812 The solution should be kept at a temperature above 80 F., preferably about 90 F. To obtain the desired pH, 48 lb. of 42 Baum nitric acid is added to the base liquor above. The pH will be 5.411 in this specific example. This lies within the preferred range of about 5.0 to 5.8.
Step 2.The above solution is pumped into a ribbon mixer and there is added about 18 lb. of a commercial polysaccharide gum, for example, General Mills 492 type gum thickener. The mixture is allowed to hydrate for approximately 3 minutes.
Step 3.T he required amounts of coarse aluminum and fine aluminum with the balance of ammonium nitrate to make up the 2000 lb. batch is added and the ribbon is turned at the required rate and time to produce the proper mixing and density of final product. If desired, a solid canbonaceous fuel such as gilsonite may also be added. Gilsonite, because of difiiculty of dispersion in hydrated (thickened) mixes, is customarily added to some of the solution in the mixer before the gum is added. Final temperature of the finished slurry is usually about to and the pH is about 5.4.
The slurry product is transferred to bulk pump trucks or support tankers for distribution to blast holes in the field. The final step is pumping the bulk slurry into blast holes at a temperature of about 70 to 80 F. while injecting the crosslinking agent on the downstream side of the pump. The crosslinker converts the slurry from a sol to a water-resistant gel. This step is described below.
Crosslinking may be accomplished for example, by injecting into the exit stream from the slurry pump from 1.5 to 2 percent by weight of the slurry a crosslinking solution of the following composition:
Ingredients: Parts by weight Zirconium sulfate 7.5 Chromic acid 3.0 Aluminum sulfate 3.0
Water, to make 100 parts total.
Water erosion resistance of the gel may be varied by adjusting the zirconium sulfate content. Pliability or toughness of the gel may be adjusted by varying the chromic acid content. The tendency of water in the blast hole to break down the gel by solubility effects, leaching out the nitrates and carrying away the gilsonite and powdered aluminum in suspension is counteracted by the aluminum sulfate. The specifically disclosed crosslinking solution is believed to be about the best compromise for the range of explosive compositions disclosed above. However, it will be understood that for a specific problem situation it may be desirable to increase or decrease water erosion resistance, insolubility or toughness. For this purpose, the composition of the crosslinking solution may be varied within the limits shown below;
Ingredients: Parts by weight Zirconium sulfate 2-15 Chromie acid l- Aluminum sulfate 1-10 Water, to make 100 parts total.
What is claimed is:
1. In the method of forming in place a stable, gelled suspension explosive composition by pumping into a hole an aqueous slurry comprising:
(a) at least 8 weight percent 'water (b) at least 40 Weight percent ammonium nitrate (c) at least 0.5 weight percent finely divided solid fuel,
selected from particulate aluminum and gilsonite (d) at least 1 weight percent dissolved hexamethylenetetramine sufficient to improve sensitivity, and
(e) a stabilizing amount of a water-soluble hydroxysubstituted thickening agent, the improvement consisting of regulating the pH of the aqueous slurry to a value between 4 and 7 and injecting into the exit stream from the pump a sufficient quantity 4 of an aqueous solution of zirconium sulfate, aluminum sulfate and chromic acid to convert the thickened slurry into 'a stable, uniform, water-resistant gel.
2. In the method of forming in place a stable, gelled suspension explosive composition by pumping into a hole an aqueous slurry comprising:
-(a) at least 8 weight percent water (b) at least 40 weight percent ammonium nitrate (c) at least 0.5 weight percent finely divided solid fuel,
selected from particulate aluminum and gilsonite (d) at least 1 weight percent dissolved hexamethylenetetramine suflicient to improve sensitivity (e) at least 1 weight percent ammonium perchlorate,
sufficient to stabilize the composition against variation of sensitivity with changing temperature, and
(f) a stabilizing amount of a Water-soluble hydroxysubstituted thickening agent, the improvement consisting of regulating the pH of the aqueous slurry to a value between 5.0 and 5.8 and injecting into the exit stream from the pump a suflicient quan tity of an aqueous solution of zirconium sulfate, aluminum sulfate and chromic acid to convert the thickened slurry into a stable, uniform, water-resistant gel.
3. The method of claim 2 in which the aqueous slurry is prepared by suspending the undissolved solid ingredients of the composition in an aqueous solution comprising lwater, ammonium nitrate, sodium nit-rate, hexamethylenetetramine, nitric acid and a quantity of a polysaccharide gum suflicient to stabilize the suspension.
References Cited UNITED STATES PATENTS 3,222,232 12/1965 Schwvoyer 14944 X 3,235,423 2/1966 Ferguson 149---44 X 3,282,752 11/1966 Clay et al. 149-44 X 3,303,074 2/1967 Schwoyer 149--44 X 3,465,675 9/1969 Bronstein 149-44 X 3,523,048 8/ 1970 Hopler 149-44 X CARL D. QUIARFORTH, Primary Examiner S. I. LECHERT JR., Assistant Examiner l US. Cl. X.R.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US2205970A | 1970-03-23 | 1970-03-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3676236A true US3676236A (en) | 1972-07-11 |
Family
ID=21807604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US22059A Expired - Lifetime US3676236A (en) | 1970-03-23 | 1970-03-23 | Method of forming in place a gelled suspension explosive |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3676236A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3791255A (en) * | 1971-01-18 | 1974-02-12 | Ici Australia Ltd | Method of filling boreholes with viscous slurried explosives |
| US3962001A (en) * | 1975-03-10 | 1976-06-08 | Gulf Oil Corporation | Method of manufacturing a cap-sensitive and non-sensitive aqueous gel suspension explosive |
| US4055450A (en) * | 1975-10-10 | 1977-10-25 | Ici Australia Limited | Explosive composition containing amine solvating agent |
-
1970
- 1970-03-23 US US22059A patent/US3676236A/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3791255A (en) * | 1971-01-18 | 1974-02-12 | Ici Australia Ltd | Method of filling boreholes with viscous slurried explosives |
| US3962001A (en) * | 1975-03-10 | 1976-06-08 | Gulf Oil Corporation | Method of manufacturing a cap-sensitive and non-sensitive aqueous gel suspension explosive |
| DE2608900A1 (en) * | 1975-03-10 | 1976-09-30 | Gulf Oil Corp | PROCESS FOR THE MANUFACTURING OF Aqueous GEL EXPLOSIVES |
| JPS51115907A (en) * | 1975-03-10 | 1976-10-13 | Gulf Oil Corp | Process for preparing explosive of aqueous gel suspension liable to be initiated with or without detonator |
| DE2660649C2 (en) * | 1975-03-10 | 1983-12-01 | Gulf Oil Corp., 15230 Pittsburgh, Pa. | Process for the production of detonator-sensitive aqueous gel explosives and gel explosives produced therefrom |
| US4055450A (en) * | 1975-10-10 | 1977-10-25 | Ici Australia Limited | Explosive composition containing amine solvating agent |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: THERMEX ENERGY CORPORATION 13601 PRESTON ROAD DALL Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:GULF OIL CORPORATION;REEL/FRAME:004354/0001 Effective date: 19841114 |
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| AS | Assignment |
Owner name: GENERAL ELECTRIC CREDIT CORPORATION 100 GALLERIA P Free format text: SECURITY INTEREST;ASSIGNOR:THERMEX ENERGY CORPORATION;REEL/FRAME:004362/0093 Effective date: 19841114 |
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| AS | Assignment |
Owner name: THERMEX ENERGY CORPORATION, TEXAS Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:GENERAL ELECTRIC CAPITAL CORPORATION;REEL/FRAME:005424/0260 Effective date: 19900606 |