US4950310A
Expired / Lapsed
US
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Process for the preparation of crystalline sheet sodium silicates
Assignee: Clariant Produkte Deutschland GmbH
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Filing: 1988-12-08
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Granted: 1990-08-21
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Expires: 2008-12-08
Abstract
Abstract X-ray crystalline sodium silicates having a sheet structure and an SiO 2 :Na 2 O molar ratio of 1.9 to 3.5 are prepared by dissolving an X-ray crystalline sodium silicate having a sheet structure and an SiO 2 /Na 2 O molar ratio of 1.9:1 to 3.5:1 in water and evaporating the solution at temperatures of 20° to 445° C. For the preparation of detergents or cleaners, a mixture of surfactants and builders, which may also contain fillers, bleaching agents, bleach activators and enzymes, is made into a paste with water, mixed with an X-ray crystalline sheet sodium silicate having an SiO 2 /Na 2 O molar ratio of 1.9:1 to 3.5:1, mixed thoroughly and then spray-dried.
Inventors
- 👤 Hans-Peter Rieck
- 👤 Martin Schott
- 👤 Willy Ott
- 👤 Werner Gohla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:22
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/36; C01B33/38; C11; C11D; C11D11/00; C11D11/02; C11D3/00; C11D3/02; C11D3/12; C11D3/124; C11D3/1246; C11D3/1253; C11D3/1273
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
88 words
A process for the preparation of x-ray crystalline sodium silicates of the formula β-Na 2 Si 2 O 5 , which has a sheet structure and whose x-ray diffraction spectrum is in accordance with Table 3, wherein an x-ray crystalline sodium silicate of the formula δ-Na 2 Si 2 O 5 , having a sheet structure and whose x-ray diffraction spectrum is in accordance with Table 2 is dissolved in water at a concentrated solution sufficient to avoid hydrolysis and evaporated at temperatures of 20° to 445° C.
Claim 2
Dependent Claim
88 words
A process for the preparation of x-ray crystalline sodium silicates of the formula β-Na 2 Si 2 O 5 , which has a sheet structure and whose x-ray diffraction spectrum is in accordance with Table 3, wherein an x-ray crystalline sodium silicate of the formula δ-Na 2 Si 2 O 5 , having a sheet structure and whose x-ray diffraction spectrum is in accordance with Table 2 is dissolved in water at a concentrated solution sufficient to avoid hydrolysis and evaporated at temperatures of 20° to 445° C.
Claim 3
Dependent Claim
19 words
A process as claimed in claim 5, wherein evaporation is carried out at temperatures of 70° to 300° C.
Claim 4
Dependent Claim
19 words
A process as claimed in claim 5, wherein evaporation is carried out at temperatures of 100° to 200° C.
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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) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |