Patent US4923628A successfully refreshed from Google Patents.
US4923628A
Expired / Lapsed
US
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High bulk density detergent composition and process for its production
Assignee: Lever Brothers Co
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Filing: 1989-03-20
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Granted: 1990-05-08
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Expires: 2009-03-20
Abstract
Abstract A granular low-phosphate detergent composition is prepared by spray-drying a slurry to give a base powder containing a low to moderate level of sodium tripolyphosphate and low levels of inorganic salts, then postdosing solid material, including sodium sulphate, of high bulk density and of smaller particle size than the base powder. The resulting product has a bulk density at least 150 g/liter greater than that of the base powder and shows improved dispensing properties in an automatic washing machine.
Inventors
- 👤 Peter W. Appel
- 👤 Huug Euser
- 👤 Seeng D. Liem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:29
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/02; C11D3/04; C11D3/046; C11D11/00; C11D11/02; C11D17/00; C11D17/06; C11D17/065; C11D3/06
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
200 words
A process for the preparation of a low-phosphate granular detergent composition comprising one or more anionic and/or nonionic detergent-active compounds, from 10 to 25% by weight of sodium tripolyphosphate, and sodium sulphate, which process comprises the steps of: (i) spray-drying an aqueous slurry comprising from 10 to 25% by weight of sodium tripolyphosphate, from 0 to 6% by weight of sodium silicate, from 0 to 20% by weight (in total) of sodium sulphate and/or sodium carbonate, and one or more anionic and/or nonionic detergent-active compounds, to form a spray-dried base powder; (ii) postdosing to from 40 to 75% by weight of said spray-dried base powder from 20 to 35% by weight of sodium sulphate; and (iii) postdosing from 0 to 40% by weight of other solid and/or liquid material; the sodium sulphate postdosed in step (ii) and any solid material postdosed in step (iii) having an overall bulk density of at least 1000 g/liter and an overall Rosin-Rammler average particle size not exceeding 75% of the Rosin-Rammler average particle size of the base powder; the final composition having a bulk density at least 150 g/liter greater than that of the base powder; all percentages being based on the final composition.
Claim 2
Dependent Claim
200 words
A process for the preparation of a low-phosphate granular detergent composition comprising one or more anionic and/or nonionic detergent-active compounds, from 10 to 25% by weight of sodium tripolyphosphate, and sodium sulphate, which process comprises the steps of: (i) spray-drying an aqueous slurry comprising from 10 to 25% by weight of sodium tripolyphosphate, from 0 to 6% by weight of sodium silicate, from 0 to 20% by weight (in total) of sodium sulphate and/or sodium carbonate, and one or more anionic and/or nonionic detergent-active compounds, to form a spray-dried base powder; (ii) postdosing to from 40 to 75% by weight of said spray-dried base powder from 20 to 35% by weight of sodium sulphate; and (iii) postdosing from 0 to 40% by weight of other solid and/or liquid material; the sodium sulphate postdosed in step (ii) and any solid material postdosed in step (iii) having an overall bulk density of at least 1000 g/liter and an overall Rosin-Rammler average particle size not exceeding 75% of the Rosin-Rammler average particle size of the base powder; the final composition having a bulk density at least 150 g/liter greater than that of the base powder; all percentages being based on the final composition.
Claim 3
Dependent Claim
27 words
A process as claimed in claim 1, characterised in that the base powder contains less than 10% by weight (in total) of sodium sulphate and/or sodium carbonate.
Claim 4
Dependent Claim
22 words
A process as claimed in claim 2, characterised in that the base powder contains less than 5% by weight of sodium carbonate.
Claim 5
Dependent Claim
22 words
A process as claimed in claim 2, characterised in that the base powder contains less than 5% by weight of sodium sulphate.
Claim 6
Dependent Claim
37 words
A process as claimed in claim 1, characterised in that the sodium sulphate postdosed in step (ii) and any solid material postdosed in step (iii) contain overall not more than 15% by weight of particles <125 μm.
Claim 7
Dependent Claim
37 words
A process as claimed in claim 5, characterised in that the sodium sulphate postdosed in step (ii) and any solid material postdosed in step (iii) contain overall not more than 10% by weight of particles <125 μm.
Claim 8
Dependent Claim
26 words
A process as claimed in claim 1, characterised in that the sodium sulphate postdosed in step (ii) has a bulk density of at least 1200 g/liter.
Claim 9
Dependent Claim
26 words
A process as claimed in claim 7, characterised in that the sodium sulphate postdosed in step (ii) has a bulk density of at least 1300 g/liter.
Claim 10
Dependent Claim
28 words
A process as claimed in claim 1, characterised in that the base powder has a Rosin-Rammler average particle size within the range of from 350 to 800 μm.
Claim 11
Dependent Claim
28 words
A process as claimed in claim 9, characterised in that the base powder has a Rosin-Rammler average particle size within the range of from 500 to 750 μm.
Claim 12
Dependent Claim
37 words
A process as claimed in claim 1, characterised in that the sodium sulphate postdosed in step (ii) and any solid material postdosed in step (iii) have an overall Rosin-Rammler average particle size of at least 200 μm.
Claim 13
Dependent Claim
37 words
A process as claimed in claim 1, characterised in that the sodium sulphate postdosed in step (ii) and any solid material postdosed in step (iii) have an overall Rosin-Rammler average particle size of at least 300 μm.
Claim 14
Dependent Claim
41 words
A process as claimed in claim 1, characterised in that the sodium sulphate postdosed in step (ii) and any solid material postdosed in step (iii) have an overall Rosin-Rammler average particle size within the range of from 300 to 400 μm.
Claim 15
Dependent Claim
45 words
A process as claimed in claim 1, characterised in that the sodium sulphate postdosed in step (ii) and any solid material postdosed in step (iii) have an overall Rosin-Rammler average particle size not exceeding 70% of the Rosin-Rammler average particle size of the base powder.
Claim 16
Dependent Claim
35 words
A process as claimed in claim 1, characterised in that the sodium sulphate postdosed in step (ii) and any solid material postdosed in step (iii) have an overall bulk density of at least 1050 g/liter.
Claim 17
Dependent Claim
28 words
A process as claimed in claim 1, characterised in that the final composition has a bulk density at least 200 g/liter greater than than of the base powder.
Claim 18
Dependent Claim
26 words
A process of claimed in claim 1, characterised in that the base powder has a bulk density within the range of from 400 to 650 g/liter.
Claim 19
Dependent Claim
23 words
A process as claimed in claim 1, characterised in that the base powder contains less than 15% by weight of particles <125 μm.
Claim 20
Dependent Claim
16 words
A process as claimed in claim 1, characterised in that step (i) is carried out continuously.
Claim 21
Dependent Claim
181 words
A low-phosphate granular detergent composition comprising one or more anionic and/or nonionic detergent-active compounds, sodium tripolyphosphate, and sodium sulphate, characterised in that: (a) the composition contains a total of from 10 to 25% by weight of sodium tripolyphosphate; (b) the composition has a bulk density of at least 650 g/liter. (c) the composition comprises: (i) from 40 to 75% by weight of a spray-dried base powder containing from 10 to 25% by weight of sodium tripolyphosphate, from 0 to 20% by weight (in total) of sodium sulphate and/or sodium carbonate, and one or more anionic and/or nonionic detergent-active compounds, the base powder having a Rosin-Rammler average particle size within the range of from 350 to 800 μm; (ii) from 20 to 35% by weight of postdosed sodium sulphate; and (iii) from 0 to 40% by weight of other postdosed material, the postdosed sodium sulphate (ii) and any other solid postdosed material (iii) having an overall Rosin-Rammler average particle size not exceeding 75% of the Rosin-Rammler average particle size of the base powder (i); all percentages being based on the final composition.
Claim 22
Dependent Claim
181 words
A low-phosphate granular detergent composition comprising one or more anionic and/or nonionic detergent-active compounds, sodium tripolyphosphate, and sodium sulphate, characterised in that: (a) the composition contains a total of from 10 to 25% by weight of sodium tripolyphosphate; (b) the composition has a bulk density of at least 650 g/liter. (c) the composition comprises: (i) from 40 to 75% by weight of a spray-dried base powder containing from 10 to 25% by weight of sodium tripolyphosphate, from 0 to 20% by weight (in total) of sodium sulphate and/or sodium carbonate, and one or more anionic and/or nonionic detergent-active compounds, the base powder having a Rosin-Rammler average particle size within the range of from 350 to 800 μm; (ii) from 20 to 35% by weight of postdosed sodium sulphate; and (iii) from 0 to 40% by weight of other postdosed material, the postdosed sodium sulphate (ii) and any other solid postdosed material (iii) having an overall Rosin-Rammler average particle size not exceeding 75% of the Rosin-Rammler average particle size of the base powder (i); all percentages being based on the final composition.
Claim 23
Dependent Claim
21 words
A composition as claimed in claim 20, characterised by a bulk density within the range of from 675 to 850 g/liter.
Claim 24
Dependent Claim
38 words
A composition as claimed in claim 20, characterised in that the postdosed sodium sulphate (ii) and any other solid postdosed material (iii) have an overall Rosin-Rammler average particle size within the range of from 200 to 400 μm.
References Cited (Backward Citations)
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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) | 1993-05-07 | 1993-11-06 | 1994-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-07 | 1997-11-06 | 1998-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-07 | 2001-11-06 | 2002-05-08 | $7700.00 | Window Closed / Lapsed |