US4201756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Granular calcium hypochlorite coated with an inorganic salt
Assignee: Olin Corp
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Filing: 1978-10-31
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Granted: 1980-05-06
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Expires: 1998-10-31
Abstract
Abstract A coated, rounded, solid calcium hypochlorite granule is described which is comprised of granular calcium hypochlorite encapsulated with a plurality of layers of an inorganic salt other than calcium hypochlorite. The inorganic salt is admixed with sufficient alkaline material to form a coating which has a pH in dilute aqueous solution at ambient temperature of at least about nine or higher. The inorganic salt is selected from a group consisting of the chloride, chlorate, nitrate, bromide, bromate and sulfate of an alkali metal. The alkaline material is selected from the group consisting of calcium hydroxide, strontium hydroxide, barium hydroxide, magnesium hydroxide and mixtures thereof. The inorganic salt coating comprises from about 4 to about 45 percent by weight of the calcium hypochlorite granule. The coated, rounded, solid granule of this invention is highly stable and resists chemical decomposition and dusting during storage.
Inventors
- 👤 Walter C. Saeman
- 👤 Noel N. Coe
- 👤 John P. Faust
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:22
CPC Classifications
C; C01; C01B; C01B11/00; C01B11/04; C01B11/06; C01B11/068; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
140 words
Coated rounded, solid granular calcium hypochlorite particles comprised of a core of calcium hypochlorite encapsulated with a plurality of layers of an inorganic salt other than calcium hypochlorite, wherein: (a) said inorganic salt is an alkali metal salt selected from the group consisting of the chloride, chlorate, nitrate, bromide, bromate and sulfate of an alkali metal, (b) said inorganic salt being admixed with sufficient alkaline material to form a coating which has a pH in dilute aqueous solution at ambient temperature of at least about nine or higher, (c) the portion of said inorganic salt on said core ranges from about 4 to about 45 percent by weight of said particles, and (d) said core ranges in diameter from about 200 to about 2000 microns and the outside diameter of said particles ranges from about 400 to about 5000 microns.
Claim 2
Dependent Claim
140 words
Coated rounded, solid granular calcium hypochlorite particles comprised of a core of calcium hypochlorite encapsulated with a plurality of layers of an inorganic salt other than calcium hypochlorite, wherein: (a) said inorganic salt is an alkali metal salt selected from the group consisting of the chloride, chlorate, nitrate, bromide, bromate and sulfate of an alkali metal, (b) said inorganic salt being admixed with sufficient alkaline material to form a coating which has a pH in dilute aqueous solution at ambient temperature of at least about nine or higher, (c) the portion of said inorganic salt on said core ranges from about 4 to about 45 percent by weight of said particles, and (d) said core ranges in diameter from about 200 to about 2000 microns and the outside diameter of said particles ranges from about 400 to about 5000 microns.
Claim 3
Dependent Claim
29 words
The calcium hypochlorite particles of claim 1 wherein said alkaline material is selected from the group consisting of calcium hydroxide, strontium hydroxide, barium hydroxide, magnesium hydroxide, and mixtures thereof.
Claim 4
Dependent Claim
34 words
The calcium hypochlorite particles of claim 2 wherein said alkali metal salt is selected from the group consisting of sodium chloride, potassium chloride, lithium chloride, sodium bromide, potassium bromide, lithium bromide, and mixtures thereof.
Claim 5
Dependent Claim
22 words
The calcium hypochlorite particles of claim 3 wherein said alkali metal salt is sodium chloride and said alkaline material is calcium hydroxide.
Claim 6
Dependent Claim
30 words
The calcium hypochlorite particles of claim 3 wherein the average available chlorine content of said particles ranges from about 50 to about 80 percent by weight on a dry basis.
Claim 7
Dependent Claim
22 words
The calcium hypochlorite particles of claim 5 wherein the average water content ranges from about 0.5 to about 10 percent by weight.
Claim 8
Dependent Claim
24 words
The calcium hypochlorite particles of claim 6 wherein the particle size of said calcium hypochlorite particles ranges from about 600 to about 2,000 microns.
Claim 9
Dependent Claim
43 words
The calcium hypochlorite particles of claim 7 wherein the average available chlorine content of said particles ranges from about 60 to about 78 percent by weight and the water content of said particles ranges from about 1 to about 8 percent by weight.
Claim 10
Dependent Claim
31 words
The calcium hypochlorite particles of claim 8 wherein the proportion of said inorganic salt coating on said particles ranges from about 4 to about 45 percent by weight of said particles.
Claim 11
Dependent Claim
31 words
The calcium hypochlorite particles of claim 9 wherein said calcium hypochlorite core has an available chlorine content of from about 60 to about 83 percent by weight on a dry basis.
Claim 12
Dependent Claim
23 words
The calcium hypochlorite particles of claim 3 wherein said coated particles are encapsulated in at least one layer of a different inorganic salt.
Claim 13
Dependent Claim
44 words
The calcium hypochlorite particles of claim 11 wherein said different inorganic salt is selected from the group consisting of a. chloride, chlorate, nitrate, bromide, carbonate, silicate, phosphate, sulfate pyrophosphate, tripolyphosphate, hexametaphosphate, and tetraphosphate of an alkali metal, and b. sulfates of aluminum and magnesium.
Claim 14
Dependent Claim
29 words
The calcium hypochlorite particles of claim 12 wherein said different inorganic salt is a hydrated aluminum sulfate containing from about 12 to about 18 moles of water of hydration.
Claim 15
Dependent Claim
30 words
The calcium hypochlorite particles of claim 12 wherein said different inorganic salt is a hydrate of magnesium sulfate containing from about 4 to about 7 moles of water of hydration.
Claim 16
Dependent Claim
17 words
The calcium hypochlorite particles of claim 12 wherein said different inorganic salt is a borate of sodium.
Claim 17
Dependent Claim
22 words
The calcium hypochlorite particles of claim 3 wherein said coated particles are encapsulated in at least one layer of a polyacrylic acid.
References Cited (Backward Citations)
US3036013A
Cited
US3134641A
Cited
US3576760A
Cited
US3953354A
Cited
US3793216A
Cited
US4087360A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |