Patent US3951885A successfully refreshed from Google Patents.
US3951885A
Expired / Lapsed
US
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Method of making magnesium oxychloride cement cofoamed with synthetic resin
Assignee: Thompson Chemicals Inc
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Filing: 1973-09-17
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Granted: 1976-04-20
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Expires: 1993-09-17
Abstract
Abstract A method of making a foamed fireproof product of magnesium oxychloride cement and the resulting product. A porous substrate is impregnated with a foaming mixture of magnesium chloride, magnesium oxide, and frothing agent in water. The mixture hardens with small voids throughout the porous substrate, thus providing a fireproof product of low density. The cement mixture may be co-foamed with polyurethane foam. The fireproof products of relatively low density are particularly valuable for building and construction purposes. Magnesium powder is the preferred frothing agent which, in combination with a surfactant, induces a large volume of small bubbles that remain in the composition as it is set.
Inventors
- 👤 Henry Clark Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:11
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C04; C04B; C04B28/00; C04B28/30; C04B28/32; C08J9/35; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S521/00; Y10S521/903
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
94 words
In a method of preparing a fireproof material, the steps of mixing a. between 1 and 9 parts by weight on a dry basis of 1. aqueous magnesium chloride having a specific gravity between 21.5° and 22.5° Baume, 2. between 5 and 6.5 pounds magnesium oxide per gallon of aqueous magnesium chloride, and 3. metallic frothing agent chemically reactive with ingredients (1) and (2) to produce bubbles in a foamed magnesium oxychloride cement with b. one part of the ingredients for synthetic resin foam and reacting the ingredients simultaneously to form a co-foamed product.
Claim 2
Dependent Claim
94 words
In a method of preparing a fireproof material, the steps of mixing a. between 1 and 9 parts by weight on a dry basis of 1. aqueous magnesium chloride having a specific gravity between 21.5° and 22.5° Baume, 2. between 5 and 6.5 pounds magnesium oxide per gallon of aqueous magnesium chloride, and 3. metallic frothing agent chemically reactive with ingredients (1) and (2) to produce bubbles in a foamed magnesium oxychloride cement with b. one part of the ingredients for synthetic resin foam and reacting the ingredients simultaneously to form a co-foamed product.
Claim 3
Dependent Claim
12 words
A method as in claim 1 wherein the synthetic resin is polyurethane.
Claim 4
Dependent Claim
32 words
A method as in claim 2 wherein the weight of the cement ingredients on a dry basis has a ratio to the weight of the polyurethane ingredients of between 1.5 and 9.0.
Claim 5
Dependent Claim
14 words
A method as in claim 2 wherein unexpanded polystyrene beads are added before reaction.
Claim 6
Dependent Claim
15 words
A method as in claim 1 wherein a filler is included in the co-foamed mixture.
Claim 7
Dependent Claim
12 words
A method as in claim 1 wherein the synthetic resin is resorcinol-formaldehyde.
Claim 8
Dependent Claim
67 words
A composition of matter comprising simultaneously co-foamed (a) magnesium oxychloride cement formed by mixing magnesium chloride in 21.5° to 22.5° Baume solution, 5 to 6.5 pounds magnesium oxychloride per gallon of magnesium chloride, and magnesium frothing agent, and (b) synthetic resin in which the cement ingredients are present in an amount between 1 and 9 parts by weight on a dry basis per part of synthetic resin.
Claim 9
Dependent Claim
67 words
A composition of matter comprising simultaneously co-foamed (a) magnesium oxychloride cement formed by mixing magnesium chloride in 21.5° to 22.5° Baume solution, 5 to 6.5 pounds magnesium oxychloride per gallon of magnesium chloride, and magnesium frothing agent, and (b) synthetic resin in which the cement ingredients are present in an amount between 1 and 9 parts by weight on a dry basis per part of synthetic resin.
Claim 10
Dependent Claim
14 words
A composition of matter as in claim 7 wherein the synthetic resin comprises polyurethane.
Claim 11
Dependent Claim
14 words
A composition of matter as in claim 7 wherein the synthetic resin comprises resorcinol-formaldehyde.
Claim 12
Dependent Claim
90 words
In a method of preparing a fire-resistant material, the steps of 1. preparing a mixture of a. aqueous magnesium chloride having a specific gravity between 21.5° and 22.5° Baume, b. a polyol or polyester precursor for polyurethane foam, 2. preparing a mixture of magnesium oxide in an amount between 5 and 6.5 pounds per gallon of magnesium chloride, a metallic frothing agent reactive with said chloride and oxide to produce bubbles, and an isocyanate-containing precursor for polyurethane foam, 3. reacting the two mixtures to form a co-foamed fire resistant product.
Claim 13
Dependent Claim
90 words
In a method of preparing a fire-resistant material, the steps of 1. preparing a mixture of a. aqueous magnesium chloride having a specific gravity between 21.5° and 22.5° Baume, b. a polyol or polyester precursor for polyurethane foam, 2. preparing a mixture of magnesium oxide in an amount between 5 and 6.5 pounds per gallon of magnesium chloride, a metallic frothing agent reactive with said chloride and oxide to produce bubbles, and an isocyanate-containing precursor for polyurethane foam, 3. reacting the two mixtures to form a co-foamed fire resistant product.
Claim 14
Dependent Claim
19 words
A method as in claim 10 wherein one of said mixtures contains a gaseous foaming agent for polyurethane foam.
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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) | 1979-04-20 | 1979-10-20 | 1980-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-20 | 1983-10-20 | 1984-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-20 | 1987-10-20 | 1988-04-20 | $7700.00 | Window Closed / Lapsed |