US4056655A
Expired / Lapsed
US
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Process for treating porous materials and products obtained
Assignee: Eternit SAS
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Filing: 1976-02-03
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Granted: 1977-11-01
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Expires: 1996-02-03
Abstract
Abstract A method for processing porous materials with at least one water-insoluble polymerizable compound and the products obtained, said method comprising the following steps in successive order: impregnating a porous material, especially one consisting essentially of a hydraulic binder and a granular or fibrous filler, with said compound; fully covering the thus impregnated material with an aqueous solution of a salt which precipitates when contacted with the hydraulic binder; and polymerizing the compound in the impregnated material while covered with the saline solution.
Inventors
- 👤 Marc Della Faille
- 👤 Pierre Delvaux
- 👤 Pierre Godard
- 👤 Jean Pierre Mercier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:28
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/46; C04B41/48; C04B41/60; C04B41/61; C04B41/62; C04B41/63; C08; C08G; C08G83/00; C08G83/001; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31667
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
131 words
A method for processing porous materials comprising in successive order the steps of: impregnating, with at least one water-insoluble polymerizable compound, a porous material consisting essentially of a hydraulic binder and a filler selected from the group consisting of granular and fibrous fillers; fully covering the thus impregnated material with an aqueous solution of a salt which does not substantially modify the inherent viscosity of water and heating said impregnated material to a polymerization temperature for said compound and maintaining said temperature to polymerize said compound in said material while covered with said solution, wherein said solution is a solution of a salt which precipitates when contacted with said hydraulic binder in said material, said solution having a concentration of at least 10% of the saturation concentration at the polymerization temperature.
Claim 2
Independent Claim
131 words
A method for processing porous materials comprising in successive order the steps of: impregnating, with at least one water-insoluble polymerizable compound, a porous material consisting essentially of a hydraulic binder and a filler selected from the group consisting of granular and fibrous fillers; fully covering the thus impregnated material with an aqueous solution of a salt which does not substantially modify the inherent viscosity of water and heating said impregnated material to a polymerization temperature for said compound and maintaining said temperature to polymerize said compound in said material while covered with said solution, wherein said solution is a solution of a salt which precipitates when contacted with said hydraulic binder in said material, said solution having a concentration of at least 10% of the saturation concentration at the polymerization temperature.
Claim 3
Dependent Claim
20 words
A method according to claim 1 wherein said porous materials has a mean pore radius of at least 160 A.
Claim 4
Dependent Claim
12 words
A method according to claim 2, wherein said material is an asbestos-cement.
Claim 5
Dependent Claim
23 words
A method according to claim 1, wherein said concentration of said solution is at least 30% of said saturation concentration at the temperature.
Claim 6
Dependent Claim
30 words
A method according to claim 1, wherein said impregnating step includes maintaining said materials in a liquid bath of said polymerizable compound for a period from 1 to 300 hours.
Claim 7
Independent Claim
159 words
A method for treating porous materials comprising in successive order the steps of: impregnating with at least one water-insoluble polymerizable compound, a porous material consisting essentially of a hydraulic binder and a filler selected from the group consisting of granular and fibrous fillers; fully covering the impregnated material thus obtained with an aqueous solution of a salt having the generic formula MX where M is a cation and X is an anion selected from the group consisting of chlorides, phosphates, oxalates, nitrates, sulphates, and citrates; and heating said impregnated material to a polymerization temperature for said compound and maintaining said temperature to polymerize said compound in said material while covered with said solution, wherein said solution is a solution of a salt which precipitates when contacted with said hydraulic binder in said material, said solution having a concentration of at least 10% of the saturation concentration at the polymerization temperature, whereby the mechanical properties of said material is improved.
Claim 8
Independent Claim
159 words
A method for treating porous materials comprising in successive order the steps of: impregnating with at least one water-insoluble polymerizable compound, a porous material consisting essentially of a hydraulic binder and a filler selected from the group consisting of granular and fibrous fillers; fully covering the impregnated material thus obtained with an aqueous solution of a salt having the generic formula MX where M is a cation and X is an anion selected from the group consisting of chlorides, phosphates, oxalates, nitrates, sulphates, and citrates; and heating said impregnated material to a polymerization temperature for said compound and maintaining said temperature to polymerize said compound in said material while covered with said solution, wherein said solution is a solution of a salt which precipitates when contacted with said hydraulic binder in said material, said solution having a concentration of at least 10% of the saturation concentration at the polymerization temperature, whereby the mechanical properties of said material is improved.
Claim 9
Dependent Claim
23 words
A method according to claim 6 wherein said cation M is selected from the group consisting of alkali metals, ammonium and alkaline-earth metals.
Claim 10
Dependent Claim
12 words
A method according to claim 7, wherein said material is an asbestos-cement.
Claim 11
Dependent Claim
19 words
A method according to claim 8, wherein said asbestos-cement has a mean pore radius of at least 160 A.
Claim 12
Independent Claim
164 words
A method for treating porous materials comprising in successive order the steps of: impregnating, with at least one water-insoluble polymerizable compound, a porous material consisting essentially of a hydraulic calcareous binder and a filler selected from the group consisting of granular and fibrous fillers said material having a mean pore radius of at least 160A; fully covering the impregnated material thus obtained with an aqueous solution of a salt having the generic formula MX where M is a cation selected from the group consisting of ammonium, alkali metals, and alkaline-earth metals; and X is an anion selected from the group consisting of chlorides, phosphates, oxalates, nitrates, sulphates, and citrates; and heating said impregnated material to a polymerization temperature for said compound and maintaining said temperature to polymerize said compound in said material while covered with said solution, wherein said solution has a concentration of at least 10% of the saturation concentration at the polymerization temperature, whereby the mechanical properties of said material is improved.
Claim 13
Independent Claim
164 words
A method for treating porous materials comprising in successive order the steps of: impregnating, with at least one water-insoluble polymerizable compound, a porous material consisting essentially of a hydraulic calcareous binder and a filler selected from the group consisting of granular and fibrous fillers said material having a mean pore radius of at least 160A; fully covering the impregnated material thus obtained with an aqueous solution of a salt having the generic formula MX where M is a cation selected from the group consisting of ammonium, alkali metals, and alkaline-earth metals; and X is an anion selected from the group consisting of chlorides, phosphates, oxalates, nitrates, sulphates, and citrates; and heating said impregnated material to a polymerization temperature for said compound and maintaining said temperature to polymerize said compound in said material while covered with said solution, wherein said solution has a concentration of at least 10% of the saturation concentration at the polymerization temperature, whereby the mechanical properties of said material is improved.
Claim 14
Dependent Claim
23 words
A method according to claim 10, wherein said concentration of said solution is at least 30% of said saturation concentration at the temperature.
Claim 15
Dependent Claim
20 words
A method according to claim 10 wherein said anion X is selected from the group consisting of chlorides and phosphates.
Claim 16
Dependent Claim
11 words
A method according to claim 12 wherein said material is asbestos-cement.
Claim 17
Independent Claim
140 words
A method for treating porous materials comprising in successive order the steps of: impregnating, with at least one water-insoluble polymerizable compound a porous material consisting essentially of a hydraulic calcareous binder and a filler selected from the group consisting of granular and fibrous fillers, said material having a mean pore radius of at least 160A; fully covering the impregnated material thus obtained with an aqueous solution of a salt selected from the group consisting of alkali-metal phosphates and ammonium phosphates; and heating said impregnated material to a polymerization temperature for said compound and maintaining said temperature to polymerize said compound in said material while covered with said solution, wherein said solution has a concentration of at least 10% of the saturation concentration at the polymerization temperature, whereby the mechanical properties and resistance to efflorescence formation of said materials are improved.
Claim 18
Independent Claim
140 words
A method for treating porous materials comprising in successive order the steps of: impregnating, with at least one water-insoluble polymerizable compound a porous material consisting essentially of a hydraulic calcareous binder and a filler selected from the group consisting of granular and fibrous fillers, said material having a mean pore radius of at least 160A; fully covering the impregnated material thus obtained with an aqueous solution of a salt selected from the group consisting of alkali-metal phosphates and ammonium phosphates; and heating said impregnated material to a polymerization temperature for said compound and maintaining said temperature to polymerize said compound in said material while covered with said solution, wherein said solution has a concentration of at least 10% of the saturation concentration at the polymerization temperature, whereby the mechanical properties and resistance to efflorescence formation of said materials are improved.
Claim 19
Dependent Claim
11 words
A method according to claim 14 wherein said material is asbestos-cement.
Claim 20
Dependent Claim
113 words
A polymer impregnated porous material consisting essentially of a porous asbestos cement having a mean pore radius of at least 160 A impregnated with a water-insoluble polymerized monomer, said monomer being polymerized within said asbestos cement at a polymerization temperature while said impregnated cement is covered by an aqueous solution of a salt having the generic formula MX where M is a cation selected from the group consisting of ammonium, alkali metals, and alkaline-earth metals; and X is an anion selected from the group consisting of chlorides, phosphates, oxalates, nitrates, sulphates, and citrates said solution having said solution having a concentration of at least 10% of the saturation concentration at the polymerization temperature.
Claim 21
Dependent Claim
113 words
A polymer impregnated porous material consisting essentially of a porous asbestos cement having a mean pore radius of at least 160 A impregnated with a water-insoluble polymerized monomer, said monomer being polymerized within said asbestos cement at a polymerization temperature while said impregnated cement is covered by an aqueous solution of a salt having the generic formula MX where M is a cation selected from the group consisting of ammonium, alkali metals, and alkaline-earth metals; and X is an anion selected from the group consisting of chlorides, phosphates, oxalates, nitrates, sulphates, and citrates said solution having said solution having a concentration of at least 10% of the saturation concentration at the polymerization temperature.
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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) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |