US3977988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized sodium percarbonate and process for preparing same
Assignee: Kao Corp
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Filing: 1975-03-13
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Granted: 1976-08-31
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Expires: 1995-03-13
Abstract
Abstract A process for preparing stable sodium percarbonate, by coating sodium percarbonate with a mixture of a silicate and a silicofluoride.
Inventors
- 👤 Fumikatsu Tokiwa
- 👤 Takehiko Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:04
CPC Classifications
C; C09; C09K; C09K15/00; C09K15/02; B; B01; B01J; B01J2/00; B01J2/30; C01; C01B; C01B15/00; C01B15/055; C01B15/10; C01B15/106; C11; C11D; C11D17/00; C11D17/0039; C11D3/00; C11D3/39; C11D3/3902; C11D3/3937
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
78 words
Sodium percarbonate coated with from 3 to 20 weight percent of a film consisting essentially of a mixture of a silicate and a silicofluoride, wherein the weight ratio of silicate : silicofluoride is in the range of 1:1 to 10:1, and wherein said silicate is selected from the group consisting of alkali metal silicates and alkaline earth metal silicates, and wherein said silicofluoride is selected from the group consisting of alkali metal silicofluorides and alkaline earth metal silicofluorides.
Claim 2
Dependent Claim
78 words
Sodium percarbonate coated with from 3 to 20 weight percent of a film consisting essentially of a mixture of a silicate and a silicofluoride, wherein the weight ratio of silicate : silicofluoride is in the range of 1:1 to 10:1, and wherein said silicate is selected from the group consisting of alkali metal silicates and alkaline earth metal silicates, and wherein said silicofluoride is selected from the group consisting of alkali metal silicofluorides and alkaline earth metal silicofluorides.
Claim 3
Dependent Claim
51 words
A composition as claimed in claim 1 wherein said alkali metal silicate has the formula Me 2 O.XSiO 2 , and said alkaline earth metal silicate has the formula Me'O.XSiO 2 , wherein Me is an alkali metal, Me' is an alkaline earth metal and X is from 0.5 to 4.
Claim 4
Dependent Claim
28 words
A composition as claimed in claim 1, in which said silicate is sodium silicate having the formula Na 2 O.XSiO 2 wherein X is 2.1, 2.5 or 3.1.
Claim 5
Dependent Claim
12 words
A composition as claimed in claim 3 in which X is 3.1.
Claim 6
Dependent Claim
27 words
A composition as claimed in claim 1 in which said silicofluoride is selected from the group consisting of sodium silicofluoride, potassium silicofluoride, magnesium silicofluoride and calcium silicofluoride.
Claim 7
Dependent Claim
22 words
A composition as claimed in claim 1, in which the weight ratio of silicate:silicofluoride is in the range of 3:1 to 6.1.
Claim 8
Dependent Claim
28 words
A composition as claimed in claim 1, in which the weight of said film is from 7 to 10 weight percent, based on the weight of sodium percarbonate.
Claim 9
Dependent Claim
20 words
A composition as claimed in claim 1, in which the silicate is sodium silicate and the silicofluoride is sodium silicofluoride.
Claim 10
Dependent Claim
18 words
An alkaline detergent composition containing from 1 to 30 percent by weight of the composition of claim 1.
Claim 11
Dependent Claim
100 words
A process for preparing stabilized sodium percarbonate which comprises applying to particles of sodium percarbonate an aqueous solution of a mixture of a silicate selected from the group consisting of alkali metal silicates and alkaline earth metal silicates and a silicofluoride selected from the group consisting of alkali metal silicofluorides and alkaline earth metal silicofluorides, wherein the weight ratio of silicate : silicofluoride is in the range of 1:1 to 10:1, to form a coating film of from 3 to 20 weight percent of a mixture of said silicate and said silicofluoride on the particles and then drying the film.
Claim 12
Dependent Claim
100 words
A process for preparing stabilized sodium percarbonate which comprises applying to particles of sodium percarbonate an aqueous solution of a mixture of a silicate selected from the group consisting of alkali metal silicates and alkaline earth metal silicates and a silicofluoride selected from the group consisting of alkali metal silicofluorides and alkaline earth metal silicofluorides, wherein the weight ratio of silicate : silicofluoride is in the range of 1:1 to 10:1, to form a coating film of from 3 to 20 weight percent of a mixture of said silicate and said silicofluoride on the particles and then drying the film.
References Cited (Backward Citations)
US2308992A
Cited
US3167513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |