US4115307A
Expired / Lapsed
US
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Phosphate composition
Assignee: Erco Industries Ltd
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Filing: 1977-06-13
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Granted: 1978-09-19
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Expires: 1997-06-13
Abstract
Abstract A low density, free-flowing, granular phosphate product having a high oil absorption capacity and capable of dissolving in water to provide a solution of pH about 7 to 8 is provided by mixing a hydratable alkali metal phosphate, polyphosphoric acid, and sodium carbonate and/or sodium bicarbonate and granulating the mixture with water.
Inventors
- 👤 James D. McGilvery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:36
CPC Classifications
A; A61; A61Q; A61Q19/00; A61Q19/10; A61K; A61K8/00; A61K8/02; A61K8/0216; A61K8/022; A61K8/0225; A61K8/18; A61K8/19; A61K8/24; A61K9/00; A61K9/0002; A61K9/0007; C; C02; C02F; C02F5/00; C02F5/08; C02F5/086; C11; C11D; C11D11/00; C11D11/0082; C11D11/0088; C11D17/00; C11D17/06; C11D17/065; C11D3/00; C11D3/02; C11D3/04; C11D3/06; C11D3/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
145 words
A dry, free-flowing, granular composition comprising granules formed from about 45 to about 85% by weight of a hydratable alkali metal phosphate selected from the group consisting of sodium tripolyphosphate, tetrasodium pyrophosphate, tetrapotassium pyrophosphate, tripotassium phosphate and dipotassium phosphate; about 9 to about 30% by weight of polyphosphoric acid having a P 2 O 5 content of about 75 to about 85%; about 1.5 to about 23% by weight of sodium carbonate and/or sodium bicarbonate; and about 4 to about 17% by weight of water, said granules having a bulk density of about 0.5 to about 0.8 g/cc and an oil absorbency of about 50 to about 80%; said alkali metal phosphate, said polyphosphoric acid and said sodium carbonate and/or sodium bicarbonate being present in amounts to provide an aqueous solution of pH of about 7 to about 8 upon dissolving the composition in water.
Claim 2
Dependent Claim
145 words
A dry, free-flowing, granular composition comprising granules formed from about 45 to about 85% by weight of a hydratable alkali metal phosphate selected from the group consisting of sodium tripolyphosphate, tetrasodium pyrophosphate, tetrapotassium pyrophosphate, tripotassium phosphate and dipotassium phosphate; about 9 to about 30% by weight of polyphosphoric acid having a P 2 O 5 content of about 75 to about 85%; about 1.5 to about 23% by weight of sodium carbonate and/or sodium bicarbonate; and about 4 to about 17% by weight of water, said granules having a bulk density of about 0.5 to about 0.8 g/cc and an oil absorbency of about 50 to about 80%; said alkali metal phosphate, said polyphosphoric acid and said sodium carbonate and/or sodium bicarbonate being present in amounts to provide an aqueous solution of pH of about 7 to about 8 upon dissolving the composition in water.
Claim 3
Dependent Claim
54 words
The composition of claim 1 comprising: about 65 to about 75.5% by weight of said hydratable alkali metal phosphate, about 9.2 to about 30% by weight of said polyphosphoric acid, about 1.8 to about 23% by weight of said sodium carbonate and/or sodium bicarbonate, and about 4 to about 15% by weight of water.
Claim 4
Dependent Claim
15 words
The composition of claim 1 wherein said density is about 0.55 to about 0.65 g/cc.
Claim 5
Dependent Claim
14 words
The composition of claim 1 wherein said oil absorbency is about 65 to 75%.
Claim 6
Dependent Claim
13 words
The composition of claim 1 wherein said alkali metal phosphate is sodium tripolyphosphate.
Claim 7
Dependent Claim
21 words
The composition of claim 1 wherein said polyphosphoric acid has a P 2 O 5 content of about 81 to 82%.
Claim 8
Independent Claim
222 words
A method of forming a low density, dry, free-flowing, granular phosphate composition, which comprises: forming a dry, free-flowing mixture of (1) a hydratable alkali metal phosphate selected from the group consisting of sodium tripolyphosphate, tetrasodium pyrophosphate, tetrapotassium pyrophosphate, tripotassium phosphate and dipotassium phosphate, (2) a polyphosphoric acid having a P 2 O 5 content of about 75 to about 85%, and (3) sodium carbonate and/or sodium bicarbonate, the relative quantities of said alkali metal phosphate, polyphosphoric acid and sodium carbonate and/or sodium bicarbonate being such that the mixture, if dissolved in water, would result in a solution having a pH of about 7 to 8, and granulating said mixture with water to cause reaction between diluted polyphosphoric acid and part of said sodium carbonate and/or sodium bicarbonate to evolve carbon dioxide and form an expanded dry, free-flowing, granular phosphate composition having a bulk density of about 0.5 to about 0.8 g/cc and an oil absorbency in the range of about 50 to about 80%, the overall quantities of the components of the composition being: about 45 to about 85% by weight of said hydratable alkali metal phosphate, about 9 to about 30% by weight of said polyphosphoric acid, about 1.5 to about 23% by weight of said sodium carbonate and/or sodium bicarbonate, and about 4 to about 17% by weight of water.
Claim 9
Independent Claim
222 words
A method of forming a low density, dry, free-flowing, granular phosphate composition, which comprises: forming a dry, free-flowing mixture of (1) a hydratable alkali metal phosphate selected from the group consisting of sodium tripolyphosphate, tetrasodium pyrophosphate, tetrapotassium pyrophosphate, tripotassium phosphate and dipotassium phosphate, (2) a polyphosphoric acid having a P 2 O 5 content of about 75 to about 85%, and (3) sodium carbonate and/or sodium bicarbonate, the relative quantities of said alkali metal phosphate, polyphosphoric acid and sodium carbonate and/or sodium bicarbonate being such that the mixture, if dissolved in water, would result in a solution having a pH of about 7 to 8, and granulating said mixture with water to cause reaction between diluted polyphosphoric acid and part of said sodium carbonate and/or sodium bicarbonate to evolve carbon dioxide and form an expanded dry, free-flowing, granular phosphate composition having a bulk density of about 0.5 to about 0.8 g/cc and an oil absorbency in the range of about 50 to about 80%, the overall quantities of the components of the composition being: about 45 to about 85% by weight of said hydratable alkali metal phosphate, about 9 to about 30% by weight of said polyphosphoric acid, about 1.5 to about 23% by weight of said sodium carbonate and/or sodium bicarbonate, and about 4 to about 17% by weight of water.
Claim 10
Dependent Claim
34 words
The method of claim 7 wherein said mixture of alkali metal phosphate, polyphosphoric acid, and sodium carbonate and/or sodium bicarbonate is formed by mixing together in a single step the components of said mixture.
Claim 11
Dependent Claim
87 words
The method of claim 7 wherein said mixture of alkali metal phosphate, polyphosphoric acid, and sodium carbonate and/or sodium bicarbonate is formed by first mixing the phosphate, polyphosphoric acid, and sodium carbonate and/or sodium bicarbonate to form a first mixture which would provide a solution of pH about 4 to 4.5 if dissolved in water, and subsequently mixing said first mixture with sodium carbonate and/or sodium bicarbonate and/or phosphate to form said mixture capable of providing an aqueous solution of pH about 7 when dissolved in water.
Claim 12
Dependent Claim
20 words
The method of claim 7, wherein the water is applied in the form of a fine mist during said granulation.
Claim 13
Independent Claim
222 words
A method of forming a low density, dry, free-flowing, granular phosphate composition, which comprises: forming a dry, free-flowing mixture of (1) a hydratable alkali metal phosphate selected from the group consisting of sodium tripolyphosphate, tetrapotassium pyrophosphate, tripotassium phosphate and dipotassium phosphate, and (2) a polyphosphoric acid having a P 2 O 5 content of about 75 to about 85%, and granulating said mixture with an aqueous solution of sodium carbonate and/or sodium bicarbonate to cause reaction between diluted polyphosphoric acid and part of said sodium carbonate and/or sodium bicarbonate to evolve carbon dioxide and form an expanded dry, free-flowing, granular phosphate composition having a bulk density of about 0.5 to about 0.8 g/cc and an oil absorbency in the range of about 50 to about 80%, the overall quantities of the components of the composition being: about 45 to about 85% by weight of said hydratable alkali metal phosphate, about 9 to about 30% by weight of said polyphosphoric acid, about 1.5 to about 23% by weight of said sodium carbonate and/or sodium bicarbonate, and about 4 to about 17% by weight of water, the relative quantities of said alkali metal phosphate, polyphosphoric acid and sodium carbonate and/or sodium bicarbonate being such that the product, if dissolved in water, would result in a solution having a pH of about 7 to 8.
Claim 14
Independent Claim
222 words
A method of forming a low density, dry, free-flowing, granular phosphate composition, which comprises: forming a dry, free-flowing mixture of (1) a hydratable alkali metal phosphate selected from the group consisting of sodium tripolyphosphate, tetrapotassium pyrophosphate, tripotassium phosphate and dipotassium phosphate, and (2) a polyphosphoric acid having a P 2 O 5 content of about 75 to about 85%, and granulating said mixture with an aqueous solution of sodium carbonate and/or sodium bicarbonate to cause reaction between diluted polyphosphoric acid and part of said sodium carbonate and/or sodium bicarbonate to evolve carbon dioxide and form an expanded dry, free-flowing, granular phosphate composition having a bulk density of about 0.5 to about 0.8 g/cc and an oil absorbency in the range of about 50 to about 80%, the overall quantities of the components of the composition being: about 45 to about 85% by weight of said hydratable alkali metal phosphate, about 9 to about 30% by weight of said polyphosphoric acid, about 1.5 to about 23% by weight of said sodium carbonate and/or sodium bicarbonate, and about 4 to about 17% by weight of water, the relative quantities of said alkali metal phosphate, polyphosphoric acid and sodium carbonate and/or sodium bicarbonate being such that the product, if dissolved in water, would result in a solution having a pH of about 7 to 8.
Claim 15
Dependent Claim
29 words
The method of claim 11 wherein said mixture of alkali metal phosphate and polyphosphoric acid is formed by mixing together the components of the mixture in a single step.
Claim 16
Dependent Claim
26 words
The method of claim 11 wherein the aqueous sodium carbonate and/or sodium bicarbonate solution is applied in the form of a fine mist during said granulation.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-18 | 1982-03-20 | 1982-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-18 | 1986-03-20 | 1986-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-18 | 1990-03-20 | 1990-09-19 | $7700.00 | Window Closed / Lapsed |