US4021360A
Expired / Lapsed
US
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Powder detergent compositions
Assignee: DeSoto Inc
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Filing: 1975-10-15
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Granted: 1977-05-03
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Expires: 1995-10-15
Abstract
Abstract Powder detergent compositions for machine dish washing which are effective in hard water in the absence of large amounts of phosphates are provided based on a combination of low foaming nonionic surfactant, bleaching agent, alkali metal hexametaphosphate, and from 15-70% of borax. The composition is buffered to provide a pH in the range of pH 7.0 to pH 8.5 measured in 1% water solution.
Inventors
- 👤 Robert L. McLaughlin
- 👤 Donald C. Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:40
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/02; C11D3/04; C11D3/046; C11D1/00; C11D1/66; C11D3/06; C11D3/39; C11D3/3942; C11D3/395; C11D3/3958
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
140 words
A powder detergent composition adapted for machine dish washing using hard water and which does not require the presence of large amounts of phosphates consisting essentially of the following components by weight: (1) from 2-8% of low foaming nonionic surfactant useful for machine dish washing, (2) from 0.5-5% of available chlorine or oxygen from a bleaching agent, (3) from 15-70% of borax, (4) alkali metal hexametaphosphate in an amount providing from 1-5% phosphorus, (5) solid particulate organic or inorganic buffering agent which will not precipitate calcium or magnesium salts at use concentration, said buffering agent providing a pH in the range of pH 7.0 - pH 8.5 when the composition is placed in 1% water solution, and (6) any balance of said detergent consisting essentially of inert particulate filler which does not precipitate calcium or magnesium salts at use concentration.
Claim 2
Dependent Claim
140 words
A powder detergent composition adapted for machine dish washing using hard water and which does not require the presence of large amounts of phosphates consisting essentially of the following components by weight: (1) from 2-8% of low foaming nonionic surfactant useful for machine dish washing, (2) from 0.5-5% of available chlorine or oxygen from a bleaching agent, (3) from 15-70% of borax, (4) alkali metal hexametaphosphate in an amount providing from 1-5% phosphorus, (5) solid particulate organic or inorganic buffering agent which will not precipitate calcium or magnesium salts at use concentration, said buffering agent providing a pH in the range of pH 7.0 - pH 8.5 when the composition is placed in 1% water solution, and (6) any balance of said detergent consisting essentially of inert particulate filler which does not precipitate calcium or magnesium salts at use concentration.
Claim 3
Dependent Claim
31 words
A powder detergent composition as recited in claim 1 in which said buffering agent supplies a pH of at least pH 7.8 when the composition is placed in 1% water solution.
Claim 4
Dependent Claim
32 words
A powder detergent composition as recited in claim 1 in which said composition is free of sequestrants other than those having an affinity for iron in an amount up to about 1%.
Claim 5
Dependent Claim
21 words
A powder detergent composition as recited in claim 1 in which said borax is present in an amount of from 20-60%.
Claim 6
Dependent Claim
18 words
A powder detergent composition as recited in claim 1 in which said borax is present as a pentahydrate.
Claim 7
Dependent Claim
18 words
A powder detergent composition as recited in claim 1 in which said borax is present as a decahydrate.
Claim 8
Dependent Claim
23 words
A powder detergent composition as recited in claim 1 in which inert particulate filler is present in an amount of at least 25%.
Claim 9
Dependent Claim
42 words
A powder detergent composition as recited in claim 1 in which said nonionic surfactant consists of ethylene oxide adduct of hydrophobic organic compound, the adduct containing from about 3 to about 30 mols of adducted ethylene oxide per mol of said compound.
Claim 10
Dependent Claim
33 words
A powder detergent composition as recited in claim 1 in which at least a portion of said nonionic surfactant is an ethylene oxide adduct of a monohydric alcohol containing from 8-22 carbon atoms.
Claim 11
Dependent Claim
22 words
A powder detergent composition as recited in claim 1 in which said nonionic surfactant is used in an amount of from 3-6%.
Claim 12
Dependent Claim
17 words
A powder detergent composition as recited in claim 1 in which said bleaching agent supplies active chlorine.
Claim 13
Dependent Claim
15 words
A powder detergent composition as recited in claim 1 in which sodium hexametaphosphate is used.
Claim 14
Dependent Claim
18 words
A powder detergent composition as recited in claim 3 in which said sequestrant is ethylene diamine tetraacetic acid.
Claim 15
Dependent Claim
20 words
A powder detergent composition as recited in claim 7 in which at least 25% of the composition is sodium sulfate.
Claim 16
Dependent Claim
33 words
A powder detergent composition as recited in claim 9 in which said nonionic surfactant contains from 3-6 mols of ethylene oxide per mol of C 8 - C 18 primary straight chain alcohol.
Claim 17
Dependent Claim
19 words
A powder detergent composition as recited in claim 12 in which the proportion of hexametaphosphate supplies from 2-4% phosphorus.
Claim 18
Dependent Claim
72 words
A powder detergent composition as recited in claim 15 in which a further portion of said nonionic surfactant is a liquid in which ethylene oxide is adducted onto a poly(oxypropylene) hydrophobe having a molecular weight in the range of about 900 to about 4000, the adduct containing from about 5 to about 55% of poly(oxyethylene), the two types of nonionic surfactants being used in a weight ratio of from 1:5 to 5:1.
Claim 19
Dependent Claim
23 words
A powder detergent composition as recited in claim 16 in which said poly(oxypropylene) hydrophobe has a molecular weight of from 2100 - 3600.
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) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |