US4135010A
Expired / Lapsed
US
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Sodium percarbonate particles (b)
Assignee: Evonik Operations GmbH
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Filing: 1977-09-27
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Granted: 1979-01-16
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Expires: 1997-09-27
Abstract
Abstract There are prepared sodium percarbonate particles consisting essentially of a sodium percarbonate nucleus encased in a layer of sodium silicate and sodium percarbonate and/or sodium tripolyphosphate.
Inventors
- 👤 Hans Klebe
- 👤 Gerd Knippschild
- 👤 Hubert Schuster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:20
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/39; C11D3/3942; C01; C01B; C01B15/00; C01B15/055; C01B15/10; C01B15/106; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
34 words
Sodium percarbonate particles consisting essentially of a sodium percarbonate nucleus and an encasing layer consisting essentially of sodium silicate and either (1) sodium percarbonate, (2) sodium tripolyphosphate or (3) sodium percarbonate and sodium tripolyphosphate.
Claim 2
Dependent Claim
34 words
Sodium percarbonate particles consisting essentially of a sodium percarbonate nucleus and an encasing layer consisting essentially of sodium silicate and either (1) sodium percarbonate, (2) sodium tripolyphosphate or (3) sodium percarbonate and sodium tripolyphosphate.
Claim 3
Dependent Claim
19 words
Sodium percarbonate particles according to claim 1 wherein the encasing layer consists essentially of sodium silicate and sodium percarbonate.
Claim 4
Dependent Claim
19 words
Sodium percarbonate particles according to claim 1 wherein the encasing layer consists essentially of sodium silicate and sodium tripolyphosphate.
Claim 5
Dependent Claim
21 words
Sodium percarbonate particles according to claim 1 wherein the encasing layer consists essentially of sodium silicate, sodium percarbonate and sodium tripolyphosphate.
Claim 6
Dependent Claim
17 words
Sodium percarbonate particles according to claim 1 having a total active oxygen content of 8 to 15%.
Claim 7
Dependent Claim
29 words
Sodium percarbonate particles according to claim 5 wherein the amount of sodium silicate is such as to provide an SiO 2 content of 0.05 to 5% in the particles.
Claim 8
Dependent Claim
19 words
Sodium percarbonate particles according to claim 2 wherein the encasing layer is formed from waterglass and sodium percarbonate dust.
Claim 9
Dependent Claim
18 words
Sodium percarbonate particles according to claim 3 wherein the encasing layer is formed from waterglass and sodium tripolyphosphate.
Claim 10
Dependent Claim
45 words
A process for preparing the product of claim 1 comprising wetting with the sodium percarbonate nucleus with aqueous sodium silicate and thereafter coating the wet particles with (1) sodium percarbonate dust, (2) sodium tripolyphosphate or (3) a mixture of sodium percarbonate dust and sodium tripolyphosphate.
Claim 11
Dependent Claim
25 words
The process of claim 9 consisting essentially of wetting the sodium percarbonate nucleus with waterglass and thereafter coating the wet particles with sodium percarbonate dust.
Claim 12
Dependent Claim
24 words
The process of claim 9 consisting essentially of wetting the sodium percarbonate nucleus with waterglass and thereafter coating the wet particles with sodium tripolyphosphate.
Claim 13
Dependent Claim
29 words
The process of claim 9 consisting essentially of wetting the sodium percarbonate nucleus with waterglass and thereafter coating the wet particles with both sodium percarbonate dust and sodium tripolyphosphate.
Claim 14
Dependent Claim
22 words
The process of claim 9 including the step of at least partially removing the water employed in the aqueous sodium silicate solution.
Claim 15
Dependent Claim
28 words
Sodium percarbonate particles according to claims 1 wherein the sodium silicate is selected from the group consisting of sodium metasilicate, sodium disilicate, sodium otho silicate and water glass.
Claim 16
Dependent Claim
69 words
Sodium percarbonate particles according to claim 1 wherein the encasing layer consists essentially of either: (a) 0.1 to 10% sodium silicate and 99.9 90% of sodium percarbonate, (b) 10.1 to 10% sodium silicate and 99.9 to 90% of tripolyphosphate, or (c) 0.1 to 10% sodium silicate, 5 to 80% sodium percarbonate and 15 to 90% sodium tripolyphosphate, the total of all three components of the encasing layer being 100%.
Claim 17
Dependent Claim
27 words
Sodium percarbonates particles according to claim 15 wherein the amount of sodium silicate is such as to provide 0.05 to 5% SiO 2 content in the particles.
Claim 18
Dependent Claim
23 words
Sodium percarbonate particles according to claim 15 consisting of a sodium percarbonate nucleus and an encasing layer consisting of (a), (b) or (c).
References Cited (Backward Citations)
US3932295A
Cited
US3977988A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |