US4312674A
Expired / Lapsed
US
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Composition and method of producing insoluble mag-oxy cements
Assignee: Owens Corning Fiberglas Technology Inc
•
Filing: 1980-08-11
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Granted: 1982-01-26
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Expires: 2000-08-11
Abstract
Abstract Mag-oxy cements are made by either molding or heat treating after molding at elevated temperatures. The products are made utilizing colloidal silica and/or phosphates and the products are made by either molding or by heat treating after molding at elevated temperatures. The products treated at 250° F. show considerably less solubility particularly where both phosphates and silicates are present in which case the weight loss based on the reactables may be as low as approximately 2 percent. When heat treated at 300° F., there is no weight loss in practically all cases; but a pickup in weight occurs indicating an additional hydration. Sheet molding compounds are also made by processes which provide a deficiency of water of hydration.
Inventors
- 👤 Joseph P. Stalego
- 👤 Ernest E. Lawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:26
CPC Classifications
C; C04; C04B; C04B9/00; C04B28/00; C04B28/30
Claims Analysis
Total Claims: 70
Claim 1
Independent Claim
37 words
A magnesium oxide cement modified by having sufficient orthophosphate present and incorporated into its structure by heating at temperatures above approximately 250° F. so that it has a solubility of less than 2 percent in boiling water.
Claim 2
Dependent Claim
37 words
A magnesium oxide cement modified by having sufficient orthophosphate present and incorporated into its structure by heating at temperatures above approximately 250° F. so that it has a solubility of less than 2 percent in boiling water.
Claim 3
Dependent Claim
31 words
A magnesium oxide cement modified by having sufficient orthophosphate incorporated therein and cured at a sufficiently elevated temperature to give no measurable weight loss in the standard Xenon Arc Weatherometer test.
Claim 4
Dependent Claim
31 words
A magnesium oxide cement modified by having sufficient orthophosphate incorporated therein and cured at a sufficiently elevated temperature to give no measurable weight loss in the standard Xenon Arc Weatherometer test.
Claim 5
Dependent Claim
29 words
A magnesium oxide cement modified by having sufficient phosphate solids reacted therein at a sufficiently elevated temperature that it has substantially no loss after 3 hours in boiling water.
Claim 6
Dependent Claim
29 words
A magnesium oxide cement modified by having sufficient phosphate solids reacted therein at a sufficiently elevated temperature that it has substantially no loss after 3 hours in boiling water.
Claim 7
Dependent Claim
16 words
The magnesium oxide cement of claim 3 cured at a temperature of at least 250° F.
Claim 8
Dependent Claim
12 words
The magnesium oxide cement of claim 4 having an amorphous silica filler.
Claim 9
Dependent Claim
45 words
A magnesium oxide cement formed by the reaction product of colloidal silica, magnesium oxide cement forming materials and sufficient phosphate at a sufficiently elevated temperature and for a sufficient period of time to have substantially no weight loss when boiled in water for 31/2 hours.
Claim 10
Dependent Claim
45 words
A magnesium oxide cement formed by the reaction product of colloidal silica, magnesium oxide cement forming materials and sufficient phosphate at a sufficiently elevated temperature and for a sufficient period of time to have substantially no weight loss when boiled in water for 31/2 hours.
Claim 11
Dependent Claim
11 words
The cement of claim 6 wherein the phosphate is an orthophosphate.
Claim 12
Dependent Claim
42 words
A magnesium oxide cement formed by reacting colloidal silica, magnesium oxide cement forming materials and sufficient phosphate at a sufficiently elevated temperature and for a sufficient period of time to have substantially no weight loss when boiled in water for 31/2 hours.
Claim 13
Dependent Claim
42 words
A magnesium oxide cement formed by reacting colloidal silica, magnesium oxide cement forming materials and sufficient phosphate at a sufficiently elevated temperature and for a sufficient period of time to have substantially no weight loss when boiled in water for 31/2 hours.
Claim 14
Dependent Claim
10 words
The cement of claim 8 having an amorphous silica extender.
Claim 15
Dependent Claim
18 words
The cement of claim 8 wherein the magnesium oxide cement forming materials are magnesium oxide and magnesium chloride.
Claim 16
Dependent Claim
17 words
The cement of claim 8 wherein its magnesium oxide forming materials are magnesium oxide and magnesium sulphate.
Claim 17
Dependent Claim
39 words
A magnesium oxide cement formed by the reaction produced of phosphate and magnesium oxide cement forming materials reacted at a sufficiently elevated temperature for a sufficient period of time to have substantially no weight loss when boiled in water.
Claim 18
Dependent Claim
39 words
A magnesium oxide cement formed by the reaction produced of phosphate and magnesium oxide cement forming materials reacted at a sufficiently elevated temperature for a sufficient period of time to have substantially no weight loss when boiled in water.
Claim 19
Dependent Claim
10 words
The cement of claim 12 having an amorphous silica extender.
Claim 20
Dependent Claim
18 words
The cement of claim 12 wherein the magnesium oxide cement forming materials are magnesium oxide and magnesium chloride.
Claim 21
Dependent Claim
18 words
The cement of claim 12 wherein its magnesium oxide cement forming materials are magnesium oxide and magnesium sulphate.
Claim 22
Dependent Claim
11 words
The cement of claim 12 wherein the phosphate is an orthophosphate.
Claim 23
Dependent Claim
15 words
The cement of claim 16 molded under pressure at a temperature above approximately 250° F.
Claim 24
Dependent Claim
15 words
The cement of claim 8 molded under pressure at a temperature above approximately 250° F.
Claim 25
Dependent Claim
22 words
The cement of claim 18 wherein the cement is the reaction product of colloidal silica, orthophosphates, and magnesium oxide cement forming materials.
Claim 26
Dependent Claim
39 words
A partially hydrated molding compound comprising inorganic fibers and magnesium oxide cement binder forming materials that include sufficient orthophosphate to give a product having substantially no weight loss in boiling water when the product is cured above 300° F.
Claim 27
Dependent Claim
39 words
A partially hydrated molding compound comprising inorganic fibers and magnesium oxide cement binder forming materials that include sufficient orthophosphate to give a product having substantially no weight loss in boiling water when the product is cured above 300° F.
Claim 28
Dependent Claim
28 words
The molding compound of claim 20 wherein the binder forming materials include sufficient phosphates to react with the magnesium oxide forming materials to lower their hydrate decomposition temperatures.
Claim 29
Dependent Claim
29 words
The molding compound of claim 20 wherein the binder forming materials include sufficient colloidal silica to react with the magnesium oxide forming materials and lower their hydrate decomposition temperatures.
Claim 30
Dependent Claim
26 words
The molding compound of claim 21 wherein the water present is less than eleven moles per amount of material forming one mole of magnesium oxide cement.
Claim 31
Dependent Claim
26 words
The molding compound of claim 22 wherein the water present is less than eleven moles per amount of material forming one mole of magnesium oxide cement.
Claim 32
Dependent Claim
31 words
The molding compound of claim 20 wherein the binder forming materials include both colloidal silica and phosphates to react with the magnesium oxide forming materials and lower their hydrate decomposition temperatures.
Claim 33
Dependent Claim
26 words
The molding compound of claim 25 wherein the water present is less than eleven moles per amount of material forming one mole of magnesium oxide cement.
Claim 34
Dependent Claim
55 words
The process of producing magnesium oxide cements including: heating either the hydrated cement product or the cement forming ingredients in the presence of sufficient orthophosphate and at a sufficiently elevated temperature and for a sufficient time to produce a cement having less water of crystallization than that of the same product produced at room temperature.
Claim 35
Dependent Claim
55 words
The process of producing magnesium oxide cements including: heating either the hydrated cement product or the cement forming ingredients in the presence of sufficient orthophosphate and at a sufficiently elevated temperature and for a sufficient time to produce a cement having less water of crystallization than that of the same product produced at room temperature.
Claim 36
Dependent Claim
20 words
The process of claim 27 wherein the cement has less than eleven molecules of water per magnesium oxide cement molecule.
Claim 37
Dependent Claim
29 words
The process of claim 27 including the step of: reacting sufficient colloidal silica with the magnesium oxide forming material to reduce the temperature at which insoluble cements are formed.
Claim 38
Dependent Claim
28 words
The process of claim 27 including the step of reacting sufficient phosphates with the magnesium oxide forming material to reduce the temperature at which insoluble cements are formed.
Claim 39
Dependent Claim
29 words
The process of claim 27 including the step of reacting sufficient colloidal silica with the magnesium oxide cement forming materials to make the cement generally insoluble in boiling water.
Claim 40
Dependent Claim
28 words
The process of claim 27 including the step of reacting sufficient phosphates with the magnesium oxide cement forming materials to make the cement generally insoluble in boiling water.
Claim 41
Dependent Claim
21 words
The process of claim 27 wherein the heating step is performed in a press at a temperature above approximately 250° F.
Claim 42
Dependent Claim
30 words
The process of producing a molding compound comprising intimately mixing magnesium oxide cement forming materials with water to form a paste, and drying the paste before complete crystallization takes place.
Claim 43
Dependent Claim
30 words
The process of producing a molding compound comprising intimately mixing magnesium oxide cement forming materials with water to form a paste, and drying the paste before complete crystallization takes place.
Claim 44
Dependent Claim
25 words
The process of claim 34 including the step of: molding the compound under sufficient heat and pressure to form a cement of the lower hydrates.
Claim 45
Dependent Claim
21 words
The process of claim 34 including the step of: adding water to the molding compound and molding under heat and pressure.
Claim 46
Dependent Claim
30 words
The process of claim 34 including the step of: adding sufficient colloidal silicate and phosphates to lower the formation temperatures of at least some of the hydrates to be formed.
Claim 47
Dependent Claim
34 words
The process of claim 34 including the step of: molding the materials under sufficient heat and pressure to form a crystalline phase having less than eleven molecules of water per molecule of the phase.
Claim 48
Dependent Claim
24 words
The process of claim 38 including the step of: wetting the molding compound after the drying step and before the molding step is completed.
Claim 49
Dependent Claim
23 words
The process of claim 39 including the step of: incorporating sufficient colloidal silica to the molding compound to produce a substantially insoluble product.
Claim 50
Dependent Claim
22 words
The process of claim 39 including the step of: incorporating sufficient phosphates to the molding compound to produce a substantially insoluble product.
Claim 51
Dependent Claim
30 words
The process of claim 39 including the step of: incorporating sufficient colloidal silica and phosphates that the insoluble phase can be produced at a temperature less than approximately 400° F.
Claim 52
Dependent Claim
59 words
The process of producing magnesium oxide cement articles comprising: mixing magnesium oxide cement forming materials, wetting the materials with less water than that which is necessary to form a hydrate at room temperature, hydrating and storing the partially hydrated materials, and molding the materials under heat and pressure with the addition of sufficient water to complete the desired hydration.
Claim 53
Dependent Claim
59 words
The process of producing magnesium oxide cement articles comprising: mixing magnesium oxide cement forming materials, wetting the materials with less water than that which is necessary to form a hydrate at room temperature, hydrating and storing the partially hydrated materials, and molding the materials under heat and pressure with the addition of sufficient water to complete the desired hydration.
Claim 54
Dependent Claim
14 words
The process of claim 43 wherein the addition of water is supplied by steam.
Claim 55
Dependent Claim
41 words
The process of claim 43 wherein colloidal silica and phosphates are added and reacted with the magnesium oxide cement forming materials in sufficient amounts to lower the temperature at which the eleven molecule hydrate decomposes and a lesser hydrate is formed.
Claim 56
Independent Claim
58 words
The method of making sheet molding compound comprising: mixing sufficient water with magnesium oxide cement forming materials to form a slurry, incorporating a reinforcement into the slurry, forming a sheet of the slurry and reinforcement, and drying the slurry before complete hydration of the magnesium oxide cement to the extent necessary to stop further hydration and permit storage.
Claim 57
Independent Claim
58 words
The method of making sheet molding compound comprising: mixing sufficient water with magnesium oxide cement forming materials to form a slurry, incorporating a reinforcement into the slurry, forming a sheet of the slurry and reinforcement, and drying the slurry before complete hydration of the magnesium oxide cement to the extent necessary to stop further hydration and permit storage.
Claim 58
Dependent Claim
32 words
The method of claim 46 including the step of: incorporating sufficient reactive phosphates into the slurry so that the sheet molding compound will form lower hydrates at temperatures below approximately 400° F.
Claim 59
Dependent Claim
32 words
The method of claim 46 including the step of: incorporating sufficient colloidal silica into the slurry so that the sheet molding compound will form lower hydrates at temperatures below approximately 400° F.
Claim 60
Dependent Claim
34 words
The method of claim 46 including the step of: incorporating sufficient phosphates and colloidal silica into the slurry so that the sheet molding compound will form lower hydrates at temperatures below approximately 400° F.
Claim 61
Dependent Claim
47 words
The process of producing sheet molding compound comprising: mixing magnesium oxide cement forming materials with insufficient water to form the eleven molecule hydrate, incorporating a reinforcement into the mixture, and forming a generally uniformly thick layer of the partially hydrated mixture to form a sheet molding compound.
Claim 62
Dependent Claim
47 words
The process of producing sheet molding compound comprising: mixing magnesium oxide cement forming materials with insufficient water to form the eleven molecule hydrate, incorporating a reinforcement into the mixture, and forming a generally uniformly thick layer of the partially hydrated mixture to form a sheet molding compound.
Claim 63
Dependent Claim
32 words
The method of claim 50 including the step of: incorporating sufficient reactive phosphates into the slurry so that the sheet molding compound will form lower hydrates at temperatures below approximately 400° F.
Claim 64
Dependent Claim
32 words
The method of claim 50 including the step of: incorporating sufficient colloidal silica into the slurry so that the sheet molding compound will form lower hydrates at temperatures below approximately 400° F.
Claim 65
Dependent Claim
34 words
The method of claim 50 including the step of: incorporating sufficient phosphates and colloidal silica into the slurry so that the sheet molding compound will form lower hydrates at temperatures below approximately 400° F.
Claim 66
Dependent Claim
30 words
A sheet molding compound comprising a reinforcement incorporated in magnesium oxide cement forming materials, said materials incorporating less water than necessary to form the eleven molecule hydrate of the materials.
Claim 67
Dependent Claim
30 words
A sheet molding compound comprising a reinforcement incorporated in magnesium oxide cement forming materials, said materials incorporating less water than necessary to form the eleven molecule hydrate of the materials.
Claim 68
Dependent Claim
22 words
The sheet molding compound of claim 54 incorporating sufficient phosphates to cause the materials to form lower hydrates below approximately 400° F.
Claim 69
Dependent Claim
23 words
The sheet molding compound of claim 54 incorporating sufficient colloidal silica to cause the materials to form lower hydrates below approximately 400° F.
Claim 70
Dependent Claim
25 words
The sheet molding compound of claim 54 incorporating sufficient phosphates and colloidal silica to cause the materials to form lower hydrates below approximately 400° F.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |