US5279756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-phosphate machine dishwashing detergents
Assignee: Church and Dwight Co Inc
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Filing: 1992-08-27
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Granted: 1994-01-18
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Expires: 2012-08-27
Abstract
Abstract The present invention is based upon the discovery that a non-phosphate automatic diswashing composition comprising from about 2.0 to 50.0 percent by weight of alkali metal carbonate salts such that it contains a weight ratio of about 1:1 to 20:1 carbonate to bicarbonate, from about 2.0 to 60.0 percent by weight of a water-soluble organic complexing agent comprising one or more hydrocarboxylic acids or the salts thereof, from about 0.5 to 8.0 percent by weight of about a 2:1 to a 6:1 blend of an acrylic polymer comprising a salt or ester of acrylic or methacrylic acid having a molecular weight of between about 1,000 to 25,000, with a copolymer of a substituted or unsubstituted maleic anhydride and lower olefin having a molecular weight of from about 1,000 to 50,000, and from about 0.5 to 8.0 percent by weight of a nonionic surfactant provides satisfactory cleaning without unacceptable spotting and filming and without the need to add phosphates and/or a chlorinated agent.
Inventors
- 👤 Lenore E. Savio
- 👤 Raymond S. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:03
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/37; C11D3/3746; C11D3/3757; C11D3/3761; C11D3/02; C11D3/04; C11D3/10; C11D3/20; C11D3/2075; C11D3/2086; C11D3/39; C11D3/3942
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
134 words
A non-phosphate automatic dishwashing composition comprising from about 2.0 to 50.0 percent by weight of alkali metal carbonate salts such that is contains a weight ratio of about 1:1 to 20:1 carbonate to bicarbonate, from about 2.0 to 60.0 percent by weight of a water-soluble organic complexing agent comprising one or more hydroxycarboxylic acids or the salts thereof, from about 0.5 to 8.0 percent by weight of about a 2:1 to a 6:1 blend of an acrylic polymer comprising a salt or ester of acrylic or methacrylic acid having a molecular weight of between about 1,000 to 25,000, with a copolymer of a substituted or unsubstituted maleic anhydride and lower olefin having a molecular weight of from about 1,000 to 50,000, and from about 0.5 to 8.0 percent by weight of a nonionic surfactant.
Claim 2
Dependent Claim
134 words
A non-phosphate automatic dishwashing composition comprising from about 2.0 to 50.0 percent by weight of alkali metal carbonate salts such that is contains a weight ratio of about 1:1 to 20:1 carbonate to bicarbonate, from about 2.0 to 60.0 percent by weight of a water-soluble organic complexing agent comprising one or more hydroxycarboxylic acids or the salts thereof, from about 0.5 to 8.0 percent by weight of about a 2:1 to a 6:1 blend of an acrylic polymer comprising a salt or ester of acrylic or methacrylic acid having a molecular weight of between about 1,000 to 25,000, with a copolymer of a substituted or unsubstituted maleic anhydride and lower olefin having a molecular weight of from about 1,000 to 50,000, and from about 0.5 to 8.0 percent by weight of a nonionic surfactant.
Claim 3
Dependent Claim
17 words
The composition of claim 1 wherein said composition has a pH of from about 9 to 11.
Claim 4
Dependent Claim
20 words
The composition of claim 1 wherein said composition contains up to about 10.0 percent by weight of an oxygen bleach.
Claim 5
Dependent Claim
19 words
The composition of claim 4 wherein the hydroxycarboxylic acid or salt thereof comprises citric acid or the salts thereof.
Claim 6
Dependent Claim
24 words
The composition of claim 4 wherein said composition contains from about 5.0 to 45.0 percent by weight of said citric acid or salt thereof.
Claim 7
Dependent Claim
23 words
The composition of claim 1 wherein the alkali metal carbonate salts contain a weight ratio of about 4:1 to 10:1 carbonate to bicarbonate.
Claim 8
Dependent Claim
18 words
The composition of claim 1 wherein the alkali metal carbonate is sodium carbonate, potassium carbonate, or mixtures thereof.
Claim 9
Dependent Claim
18 words
The composition of claim 1 wherein the alkali metal bicarbonate is sodium bicarbonate, potassium bicarbonate, or mixtures thereof.
Claim 10
Dependent Claim
24 words
The composition of claim 8 wherein the acrylic polymer is an acrylic acid homopolymer having a molecular weight of between about 1,000 to 10,000.
Claim 11
Dependent Claim
21 words
The composition of claim 1 wherein the weight ratio of acrylic polymer to maleic/olefin copolymer is between about 3:1 to 5:1.
Claim 12
Dependent Claim
18 words
The composition of claim 10 wherein the weight ratio of acrylic polymers to maleic/olefin copolymer is about 4:1.
Claim 13
Dependent Claim
23 words
The composition of claim 1 wherein the weight percent of maleic/olefin copolymer in said composition is less than about 1.5 percent by weight.
Claim 14
Dependent Claim
16 words
The composition of claim 1 wherein the nonionic surfactant comprises one or more ethoxylated fatty alcohols.
Claim 15
Dependent Claim
24 words
The composition of claim 1 wherein said composition contains from about 5.0 to 25.0 percent by weight of an alkali metal silicate corrosion inhibitor.
Claim 16
Dependent Claim
20 words
The composition of claim 1 wherein said composition contains up to about 60 percent by weight of an inert diluent.
Claim 17
Dependent Claim
12 words
The composition of claim 15 wherein the inert diluent is sodium sulfate.
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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) | 1997-01-17 | 1997-07-19 | 1998-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-17 | 2001-07-19 | 2002-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-17 | 2005-07-19 | 2006-01-18 | $7700.00 | Window Closed / Lapsed |