US3835216A
Expired / Lapsed
US
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Methods for production of alkali metal polysilicates
Assignee: JM Huber Corp
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Filing: 1971-10-28
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Granted: 1974-09-10
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Expires: 1991-10-28
Abstract
Abstract A method for producing alkali metal polysilicates is disclosed. Polysilicates, produced by hydrothermally reacting an aqueous dispersion of finely divided silica and an alkali metal hydroxide are spray dried and the solid product is fractured and pulverized. The fractured mass is then pelletized employing the solubility of the polysilicates to form a free-flowing product having a continuous, even surface. Pelletization may be effected with or without the use of water and/or binders.
Inventors
- 👤 G Almagro
- 👤 O Bertorelli
- 👤 H Zimmerman
- 👤 R Mays
- 👤 L Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:01
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/02; C11D3/04; C11D3/08; B; B01; B01J; B01J2/00; B01J2/02; C01; C01B; C01B33/00; C01B33/20; C01B33/32; C01B33/325; C01D; C01D7/00; C01D7/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
The method in accordance with claim 1, wherein said aqueous dispersion further comprises a sulfate salt of an alkali metal, said sulfate salt being present in said dispersion in an amount not greater than 25 percent by weight, based on the total weight of said dispersion said sulfate serving to improve the stability of the reaction mixture and to enhance the polymerization thereof.
Claim 2
Dependent Claim
29 words
The method in accordance with claim 1 wherein said pellets are dried at a temperature of between about 70* to 150*C to reduce the moisture content below 20 percent.
References Cited (Backward Citations)
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GB191123391A
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US1517891A
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US2881049A
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GB887972A
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US3340018A
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GB1149859A
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US3687640A
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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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |