US4244832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphate-free machine dishwashing detergents useful at low temperatures
Assignee: BASF Corp
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Filing: 1979-07-27
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Granted: 1981-01-13
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Expires: 1999-07-27
Abstract
Abstract It is possible to provide a detergent for use in dishwashing machines which is both completely free of phosphate and is useful at temperatures such as 120° F. (49° C.), by making a mixture containing 30 percent sodium citrate, 20 percent sodium carbonate, 1-6 percent of chlorinated cyanurate, 20-40 percent of sodium metasilicate, 1 to 9 percent of nonionic surfactant of a kind disclosed herein; and the remainder of fillers, such as sodium sulfate and/or sodium chloride.
Inventors
- 👤 Thomas M. Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:51
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/395; C11D3/3955; C11D1/00; C11D1/38; C11D1/42; C11D1/44; C11D3/02; C11D3/04; C11D3/08; C11D3/10; C11D3/16; C11D3/20; C11D3/2075; C11D3/2086
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
142 words
A method of washing dishware comprising the step wherein said dishware is brought into contact with water and 0.2 to 0.5 percent by weight of a detergent at a temperature of 71° C. to 38° C., said detergent consisting essentially of 1 to 9 weight percent of a phosphate-free, nonionic surfactant of the structural formula: ##STR6## wherein n and m are such that the molecular weight attributable to the oxypropylene hydrophobe is 800 to 2000 per chain and the portion of the molecular weight attributable to oxyethylene units is 5 to 16 percent, R being a divalent organic radical containing 2 to 6 carbon atoms and 22 to 38 weight percent of sodium citrate, 15 to 25 percent by weight of sodium carbonate, 1 to 6 percent by weight of chlorinated cyanurate, and 20 to 40 percent by weight of sodium metasilicate.
Claim 2
Independent Claim
142 words
A method of washing dishware comprising the step wherein said dishware is brought into contact with water and 0.2 to 0.5 percent by weight of a detergent at a temperature of 71° C. to 38° C., said detergent consisting essentially of 1 to 9 weight percent of a phosphate-free, nonionic surfactant of the structural formula: ##STR6## wherein n and m are such that the molecular weight attributable to the oxypropylene hydrophobe is 800 to 2000 per chain and the portion of the molecular weight attributable to oxyethylene units is 5 to 16 percent, R being a divalent organic radical containing 2 to 6 carbon atoms and 22 to 38 weight percent of sodium citrate, 15 to 25 percent by weight of sodium carbonate, 1 to 6 percent by weight of chlorinated cyanurate, and 20 to 40 percent by weight of sodium metasilicate.
Claim 3
Dependent Claim
35 words
The method of claim 1 wherein said detergent also contains 2 to 15 percent by weight of a filler selected from the group consisting of at least one of an alkali metal chloride or sulfate.
Claim 4
Dependent Claim
15 words
The method of claim 2 wherein R is alkylene of 2 to 6 carbon atoms.
Claim 5
Dependent Claim
24 words
The method of claim 3 wherein said filler is selected from the group consisting of at least one of sodium chloride and sodium sulfate.
Claim 6
Dependent Claim
11 words
The method of claim 4 wherein R is the ethylene radical.
Claim 7
Dependent Claim
131 words
A phosphate-free dishwasher detergent composition effective at a temperature of 71° C. to 38° C. consisting essentially of 1 to 9 percent by weight, based upon the total weight of said detergent composition of a nonionic surfactant, said surfactant having the structural formula: ##STR7## wherein n and m are such that the molecular weight attributable to the oxypropylene hydrophobe is 800 to 2000 per chain and the portion of the molecular weight attributable to oxyethylene units is 5 to 16 percent, R being a divalent organic radical containing 2 to 6 carbon atoms and 22 to 38 percent by weight of sodium citrate, 15 to 25 percent by weight of sodium carbonate, 1 to 6 percent by weight of chlorinated cyanurate, and 20 to 40 percent by weight of sodium metasilicate.
Claim 8
Dependent Claim
131 words
A phosphate-free dishwasher detergent composition effective at a temperature of 71° C. to 38° C. consisting essentially of 1 to 9 percent by weight, based upon the total weight of said detergent composition of a nonionic surfactant, said surfactant having the structural formula: ##STR7## wherein n and m are such that the molecular weight attributable to the oxypropylene hydrophobe is 800 to 2000 per chain and the portion of the molecular weight attributable to oxyethylene units is 5 to 16 percent, R being a divalent organic radical containing 2 to 6 carbon atoms and 22 to 38 percent by weight of sodium citrate, 15 to 25 percent by weight of sodium carbonate, 1 to 6 percent by weight of chlorinated cyanurate, and 20 to 40 percent by weight of sodium metasilicate.
Claim 9
Dependent Claim
35 words
The composition of claim 6 wherein said composition also contains 2 to 15 percent by weight of a filler selected from the group consisting of at least one of an alkali metal chloride or sulfate.
Claim 10
Dependent Claim
15 words
The composition of claim 7 wherein R is alkylene of 2 to 6 carbon atoms.
Claim 11
Dependent Claim
24 words
The composition of claim 7 wherein said filler is selected from the group consisting of at least one of sodium chloride and sodium sulfate.
Claim 12
Dependent Claim
11 words
The composition of claim 9 wherein R is the ethylene radical.
Claim 13
Dependent Claim
120 words
A phosphate-free dishwasher detergent effective at a temperature of 71° C. to 38° C. consisting essentially of 1 to 9 percent by weight of a nonionic surfactant, based upon the total weight of said detergent, said surfactant consisting of a block polymer surfactant prepared by first oxyethylating and then oxypropylating N,N,N',N'-tetrakis-(2hydroxypropyl)-ethylenediamine, the oxyethylene units accounting for 5 to 16 percent of the molecular weight of said compound and the molecular weight attributable to the oxypropylene units being 800 to 2000 per chain and 22 to 38 percent by weight of sodium citrate, 15 to 25 percent by weight of sodium carbonate, 1 to 6 percent by weight of chlorinated cyanurate, and 20 to 40 percent by weight of sodium metasilicate.
Claim 14
Dependent Claim
120 words
A phosphate-free dishwasher detergent effective at a temperature of 71° C. to 38° C. consisting essentially of 1 to 9 percent by weight of a nonionic surfactant, based upon the total weight of said detergent, said surfactant consisting of a block polymer surfactant prepared by first oxyethylating and then oxypropylating N,N,N',N'-tetrakis-(2hydroxypropyl)-ethylenediamine, the oxyethylene units accounting for 5 to 16 percent of the molecular weight of said compound and the molecular weight attributable to the oxypropylene units being 800 to 2000 per chain and 22 to 38 percent by weight of sodium citrate, 15 to 25 percent by weight of sodium carbonate, 1 to 6 percent by weight of chlorinated cyanurate, and 20 to 40 percent by weight of sodium metasilicate.
Claim 15
Dependent Claim
35 words
The detergent of claim 11 wherein said detergent also contains 2 to 15 percent by weight of a filler selected from the group consisting of at least one of the alkali metal chlorides and sulfates.
Claim 16
Dependent Claim
24 words
The detergent of claim 12 wherein said filler is selected from the group consisting of at least one of sodium chloride and sodium sulfate.
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) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |