US3951885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making magnesium oxychloride cement cofoamed with synthetic resin
Assignee: Thompson Chemicals Inc
•
Filing: 1973-09-17
•
Granted: 1976-04-20
•
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 14:00
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.
References Cited (Backward Citations)
US3130174A
Cited
US3238155A
Cited
US3211675A
Cited
US3354099A
Cited
US3502610A
Cited
GB1214478A
Cited
GB1192864A
Cited
US3607797A
Cited
US3763070A
Cited
US3778304A
Cited
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 |