US4013581A
Expired / Lapsed
US
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Bleach tablet composition
Assignee: Procter and Gamble Co
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Filing: 1975-07-10
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Granted: 1977-03-22
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Expires: 1995-07-10
Abstract
Abstract Peroxygen bleaches, especially diperazelaic acid, are provided in tablet form useful for bleaching fabrics.
Inventors
- 👤 Arthur Elmer Huber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:25
CPC Classifications
C; C11; C11D; C11D17/00; C11D17/0047; C11D17/0065; C11D17/0073; C11D3/00; C11D3/39; C11D3/3945
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
92 words
A bleach composition in tablet form, consisting essentially of: a. a mixture of a solid peroxygen bleach and sodium sulfate, at a weight ratio of sodium sulfate:peroxygen bleach in the range from about 3:1 to about 1:3; and b. a mixture of microfine, free-flowing starch and microcrystalline cellulose, at a weight ratio of starch:cellulose in the range from about 5:28 to about 28:5, the weight ratio of the mixture of starch and cellulose to the mixture of peroxygen bleach and sodium sulfate being in the range from about 1:5 to about 1:2.
Claim 2
Dependent Claim
92 words
A bleach composition in tablet form, consisting essentially of: a. a mixture of a solid peroxygen bleach and sodium sulfate, at a weight ratio of sodium sulfate:peroxygen bleach in the range from about 3:1 to about 1:3; and b. a mixture of microfine, free-flowing starch and microcrystalline cellulose, at a weight ratio of starch:cellulose in the range from about 5:28 to about 28:5, the weight ratio of the mixture of starch and cellulose to the mixture of peroxygen bleach and sodium sulfate being in the range from about 1:5 to about 1:2.
Claim 3
Dependent Claim
27 words
A composition according to claim 1 wherein the peroxygen bleach is a member selected from the group consisting of peroxyacids and diperoxyacids and the stable salts thereof.
Claim 4
Dependent Claim
43 words
A composition according to claim 2 wherein the peroxygen bleach is a member selected from the group consisting of diperazelaic acid, perlauric acid, perpalargonic acid, pertallow acid, 1,2-decane diperoxydicarboxylic acid, 1,12-diperdodecanedioic acid, 1,2-tetradec(3-)ene monoperoxydicarboxylic acid, 1,2-tetradec(3-)ene diperoxydicarboxylic acid, and the stable salts thereof.
Claim 5
Dependent Claim
19 words
A composition according to claim 3 wherein the peroxygen bleach is diperazelaic acid, or an alkali metal salt thereof.
Claim 6
Dependent Claim
59 words
A composition according to claim 4 consisting essentially of from about 20% to about 50% by weight of diperazelaic acid, or a salt thereof, from about 20% to about 50% by weight of sodium sulfate, from about 5% to about 28% by weight of microfine, free-flowing starch and from about 5% to about 28% by weight of microcrystalline cellulose.
Claim 7
Dependent Claim
28 words
A composition according to claim 1 additionally containing a chelating agent at a weight ratio of chelating agent:peroxygen bleach in the range from about 0.2:100 to about 3.0:100.
Claim 8
Dependent Claim
41 words
A composition according to claim 6 wherein the chelating agent is a member selected from the group consisting of ethylenediaminetetraacetic acid, ethane-1-hydroxy-1,1-diphosphonic acid, nitrilotriacetic acid, ethane-1-hydroxy-1,1,2-triphosphonic acid, citric acid, succinic acid, mellitic acid, benzene pentacarboxylic acid, and the water-soluble salts thereof.
Claim 9
Dependent Claim
42 words
A composition according to claim 6 wherein the chelating agent is a member selected from the group consisting of ethylenediaminetetraacetic acid, the water-soluble salts of ethylenediaminetetraacetic acid, and mixtures thereof, and wherein the peroxygen bleach is diperazelaic acid, or a salt thereof.
Claim 10
Dependent Claim
88 words
A bleach tablet especially adapted for use in an automatic washer, consisting essentially of: from about 10 grams to about 15 grams of diperazelaic acid, or the sodium salt thereof; from about 3 grams to about 6 grams of microfine, free-flowing starch; from about 7 grams to about 12 grams of microcrystalline cellulose; from about 10 grams to about 15 grams of sodium sulfate; from about 0.04 grams to about 0.08 grams of tetrasodium ethylenediaminetetraacetic acid; and from about 0.2 grams to about 0.8 grams of magnesium stearate.
Claim 11
Dependent Claim
88 words
A bleach tablet especially adapted for use in an automatic washer, consisting essentially of: from about 10 grams to about 15 grams of diperazelaic acid, or the sodium salt thereof; from about 3 grams to about 6 grams of microfine, free-flowing starch; from about 7 grams to about 12 grams of microcrystalline cellulose; from about 10 grams to about 15 grams of sodium sulfate; from about 0.04 grams to about 0.08 grams of tetrasodium ethylenediaminetetraacetic acid; and from about 0.2 grams to about 0.8 grams of magnesium stearate.
Claim 12
Dependent Claim
21 words
A tablet according to claim 9 characterized by a thickness in the range from about 1 inch to about 1/4 inch.
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) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |