US4355014A
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US
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Stable calcium hypochlorite composition and method for manufacture thereof
Assignee: Tosoh Corp
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Filing: 1980-05-23
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Granted: 1982-10-19
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Expires: 2000-05-23
Abstract
Abstract A stable calcium hypochlorite composition and a method for the preparation thereof. The composition has a calcium hypochlorite anhydride and/or a calcium hypochlorite dihydrate used as main constituent and comprises at least 60 wt % of calcium hypochlorite; at least 5 wt % of calcium hydroxide; at least 4 wt % of water content; and 5 wt % or less of than that calcium chloride. The composition is stable and decomposes only in a less degree at a high temperature and during storage over a long period.
Inventors
- 👤 Tsugio Murakami
- 👤 Kazushige Igawa
- 👤 Yoichi Hiraga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:22
CPC Classifications
A; A01; A01N; A01N59/00; C; C01; C01B; C01B11/00; C01B11/04; C01B11/06; C01B11/064; C02; C02F; C02F1/00; C02F1/72; C02F1/76; C11; C11D; C11D3/00; C11D3/395; C11D3/3951
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
57 words
A stable calcium hypochlorite composition having a calcium hypochlorite anhydride and/or a calcium hypochlorite dihydrate as main constituent thereof, said composition comprising at least 60 wt % of calcium hypochlorite, at least 5 wt % of calcium hydroxide, at least 4 wt % of water content and 5 wt % or less than that of calcium chloride.
Claim 2
Dependent Claim
57 words
A stable calcium hypochlorite composition having a calcium hypochlorite anhydride and/or a calcium hypochlorite dihydrate as main constituent thereof, said composition comprising at least 60 wt % of calcium hypochlorite, at least 5 wt % of calcium hydroxide, at least 4 wt % of water content and 5 wt % or less than that of calcium chloride.
Claim 3
Dependent Claim
18 words
A stable calcium hypochlorite composition according to claim 1 wherein said calcium hydroxide is virtually free calcium hydroxide.
Claim 4
Dependent Claim
25 words
A stable calcium hypochlorite composition according to claim 1 or 2 comprising 6-8 wt % of calcium hydroxide and 7-22 wt % of water content.
Claim 5
Independent Claim
73 words
A method for manufacturing a stable calcium hypochlorite composition wherein calcium hydroxide is added to a raw calcium hypochlorite composition having a calcium hypochlorite anhydride and/or a calcium hypochlorite dihydrate as main constituent thereof to obtain a composition comprising at least 60 wt % of calcium hypochlorite, at least 5 wt % of calcium hydroxide, at least 4 wt % of water content and 5 wt % or less than of calcium chloride.
Claim 6
Independent Claim
73 words
A method for manufacturing a stable calcium hypochlorite composition wherein calcium hydroxide is added to a raw calcium hypochlorite composition having a calcium hypochlorite anhydride and/or a calcium hypochlorite dihydrate as main constituent thereof to obtain a composition comprising at least 60 wt % of calcium hypochlorite, at least 5 wt % of calcium hydroxide, at least 4 wt % of water content and 5 wt % or less than of calcium chloride.
Claim 7
Dependent Claim
42 words
A method for preparing a stable calcium hypochlorite composition according to claim 4 wherein said raw calcium hypochlorite composition includes water content not exceeding 70 parts by weight and calcium chloride not exceeding 8 parts by weight of 100 of calcium hypochlorite.
Claim 8
Dependent Claim
37 words
A method for preparing a stable calcium hypochlorite composition according to claim 4 or 5 wherein said calcium hydroxide is at least 2 parts by weight as Ca(OH) 2 to 100 of said raw calcium hypochlorite composition.
Claim 9
Dependent Claim
39 words
A method for preparing a stable calcium hypochlorite composition according to claim 4 or 5 wherein said calcium hydroxide is between 5 and 10 parts by weight as Ca(OH) 2 to 100 parts of said raw calcium hypochlorite composition.
Claim 10
Dependent Claim
28 words
A method for preparing a stable calcium hypochlorite composition according to claim 4 or 5 wherein said calcium hydroxide to be added is a free calcium hydroxide powder.
Claim 11
Dependent Claim
49 words
A method for preparing a stable calcium hypochlorite composition according to claim 8 wherein said calcium hydroxide contains water in quantity not exceeding 10 wt % and calcium carbonate not exceeding 5 wt %, said calcium hydroxide being of particle size capable of passing through a 200 mesh screen.
Claim 12
Dependent Claim
30 words
A method for preparing a stable calcium hypochlorite composition according to claim 4 or 5 comprising 6-8 wt % of said calcium hydroxide and 7-22 wt % of water content.
Claim 13
Dependent Claim
94 words
A method for preparing a stable calcium hypochlorite composition according to claim 4 or 5 wherein said raw calcium hypochlorite composition contains as main constituent thereof a coarse calcium hypochlorite dihydrate or a dried product obtained therefrom, said coarse calcium hypochlorite dihydrate being obtained by adding as seed crystals, in crystallizing a calcium hypochlorite dihydrate, a prismatic calcium hypochlorite dihydrate having its ases a and b (in the direction of width) and axis c (in the direction of thickness) in the ratio of: ##EQU3## and having the axis c measure at least 5 microns.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-18 | 1986-04-19 | 1986-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-18 | 1990-04-19 | 1990-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-18 | 1994-04-19 | 1994-10-19 | $7700.00 | Window Closed / Lapsed |