US4427611A
Expired / Lapsed
US
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Process for preparing calcium silicate shaped product
Assignee: Mitsubishi Chemical Corp
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Filing: 1982-10-13
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Granted: 1984-01-24
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Expires: 2002-10-13
Abstract
Abstract A calcium silicate shaped product is produced by forming an aqueous slurry of calcium silicate hydrate obtained by reacting a calcareous source with a siliceous source dispersed in water under heating; molding said aqueous slurry and heat-treating said molded product under the condition providing the equations (I) and (II); 100≦θ·T (I) 50≦θ≦300 (II) wherein θ represents a temperature of the inner part of the molded product (°C.) and T represents a time (hour) and providing a percent water loss of the treated molded product of less than 25 wt. %, before drying or steam-curing and drying the molded product.
Inventors
- 👤 Yasuo Oguri
- 👤 Mitsuru Awata
- 👤 Junji Saito
- 👤 Soichi Inoue
- 👤 Tatsuo Andio
- 👤 Mitsunobu Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:31
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/18; C04B40/00; C04B40/02; C04B40/024; C04B2111/00; C04B2111/00241; C04B2111/0025; Y; Y02; Y02P; Y02P40/00; Y02P40/60
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
116 words
A process for producing a shaped calcium silicate product, comprising: (a) forming an aqueous slurry of calcium silicate hydrate obtained by heating and reacting a calcareous source with a siliceous source in water as a dispersion; (b) molding said aqueous slurry into a shaped object; (c) heat treating said molded product under the conditions specified by the relationships (I) and (II): 10≦θ· T (I) 50≦θ≦300 (II) wherein θ represents the temperature (°C.) of the interior of said molded product and T represents the time (hrs), with the proviso that the amount of water loss during said heat treatment is less than 25 wt.%; (d) optionally steam curing said treated product; and (e) drying the cured product.
Claim 2
Dependent Claim
116 words
A process for producing a shaped calcium silicate product, comprising: (a) forming an aqueous slurry of calcium silicate hydrate obtained by heating and reacting a calcareous source with a siliceous source in water as a dispersion; (b) molding said aqueous slurry into a shaped object; (c) heat treating said molded product under the conditions specified by the relationships (I) and (II): 10≦θ· T (I) 50≦θ≦300 (II) wherein θ represents the temperature (°C.) of the interior of said molded product and T represents the time (hrs), with the proviso that the amount of water loss during said heat treatment is less than 25 wt.%; (d) optionally steam curing said treated product; and (e) drying the cured product.
Claim 3
Dependent Claim
80 words
The process of claim 1, wherein said aqueous slurry contains a calcium silicate hydrate of the tobermorite structure having been reacted at a temperature of greater than 130° C. and having a wet volume of more than 15 cm 3 /g as defined by the equation: wet volume=V/W, wherein W represents the total weight of the calcareous source and the siliceous source and V represents the volume of the solid components after the aqueous slurry has settled for 24 hours.
Claim 4
Dependent Claim
31 words
The process of claim 1, wherein said aqueous slurry of calcium silicate hydrate is admixed with a reinforcing fibrous material and the resulting mixture is molded by press filter-molding and cured.
Claim 5
Dependent Claim
56 words
The process of claim 1, wherein said aqueous slurry of calcium silicate hydrate is prepared by mixing the siliceous source and the calcareous source with a reinforcing fibrous material and heating the resulting mixture in water followed by completing the preparation of said molded product by press filter-molding said aqueous slurry and curing the molded product.
Claim 6
Dependent Claim
26 words
The process of claim 1, wherein the reaction of the siliceous source and the calcaerous source is conducted at a temperature of 150° to 230° C.
Claim 7
Dependent Claim
25 words
The process of claim 1, wherein the heat treating conditions of step (c) are defined by the relationships (I') and (II'): 100≦θ·T≦1,000 (I') 70≦θ≦230 (II')
Claim 8
Dependent Claim
28 words
The process of claim 1, wherein said heat treatment of step (c) is conducted under the provisions in which less than 10 wt.% of the water is removed.
Claim 9
Dependent Claim
29 words
The process of claim 1, wherein said heat treatment of step (c) is conducted under the provisions in which the amount of water removed is less than 5 wt.%.
Claim 10
Dependent Claim
32 words
The process of claim 1, wherein the steam pressure during steam curing of the molded and heat treated product is conducted at a pressure ranging from 5 to 50 kg/cm 2 G.
Claim 11
Dependent Claim
32 words
The process of claim 1, wherein the steam pressure during steam curing of the molded and heat treated product is conducted at a pressure ranging from 6 to 30 kg/cm 2 G.
Claim 12
Dependent Claim
115 words
A process for producing a shaped calcium silicate product, comprising: (a) forming an aqueous slurry of calcium silicate hydrate obtained by heating and reacting a calcareous source with a siliceous source in water as a dispersion; (b) molding said aqueous slurry into a shaped object; (c) heat treating said molded product under the conditions specified by the relationships (I) and (II): 100≦θ≦·T (I) 50≦θ≦300 (II) wherein θ represents the temperature (°C.) of the heat treatment and T represents the time (hrs) of heat treatment, with the proviso that the amount of water loss during said heat treatment is less than 25 wt.%; (d) optionally steam curing said treated product; and (e) drying the cured product.
Claim 13
Dependent Claim
115 words
A process for producing a shaped calcium silicate product, comprising: (a) forming an aqueous slurry of calcium silicate hydrate obtained by heating and reacting a calcareous source with a siliceous source in water as a dispersion; (b) molding said aqueous slurry into a shaped object; (c) heat treating said molded product under the conditions specified by the relationships (I) and (II): 100≦θ≦·T (I) 50≦θ≦300 (II) wherein θ represents the temperature (°C.) of the heat treatment and T represents the time (hrs) of heat treatment, with the proviso that the amount of water loss during said heat treatment is less than 25 wt.%; (d) optionally steam curing said treated product; and (e) drying the cured product.
Claim 14
Dependent Claim
80 words
The process of claim 11, wherein said aqueous slurry contains a calcium silicate hydrate of the tobermorite structure having been reacted at a temperature of greater than 130° C. and having a wet volume of more than 15 cm 3 /g as defined by the equation: wet volume=V/W, wherein W represents the total weight of the calcareous source and the siliceous source and V represents the volume of the solid components after the aqueous slurry has settled for 24 hours.
Claim 15
Dependent Claim
31 words
The process of claim 11, wherein said aqueous slurry of calcium silicate hydrate is admixed with a reinforcing fibrous material and the resulting mixture is molded by press filter-molding and cured.
Claim 16
Dependent Claim
56 words
The process of claim 11, wherein said aqueous slurry of calcium silicate hydrate is prepared by mixing the siliceous source and the calcareous source with a reinforcing fibrous material and heating the resulting mixture in water followed by completing the preparation of said molded product by press filter-molding said aqueous slurry and curing the molded product.
Claim 17
Dependent Claim
26 words
The process of claim 11, wherein the reaction of the siliceous source and the calcareous source is conducted at a temperature of 150° to 230° C.
Claim 18
Dependent Claim
25 words
The process of claim 11, wherein the heat treating conditions of step (c) are defined by the relationships (I') and (II'): 100≦θ·T≦1,000 (I') 70≦θ≦230 (II')
Claim 19
Dependent Claim
28 words
The process of claim 11, wherein said heat treatment of step (c) is conducted under the provisions in which less than 10 wt.% of the water is removed.
Claim 20
Dependent Claim
29 words
The process of claim 11, wherein said heat treatment of step (c) is conducted under the provisions in which the amount of water removed is less than 5 wt.%.
Claim 21
Dependent Claim
32 words
The process of claim 11, wherein the steam pressure during steam curing of the molded and heat treated product is conducted at a pressure ranging from 5 to 50 kg/cm 2 G.
Claim 22
Dependent Claim
32 words
The process of claim 11, wherein the steam pressure during steam curing of the molded and heat treated product is conducted at a pressure ranging from 6 to 30 kg/cm 2 G.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |