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US5152911A
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Non-phosphate machine dishwashing detergents
Assignee: Church and Dwight Co Inc
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Filing: 1991-10-11
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Granted: 1992-10-06
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Expires: 2011-10-11
Abstract
Abstract The present invention is based upon the discovery that high levels of carbonate salts can be formulated together with low levels of a mixture of certain polycarboxylate homopolymers and copolymers (i.e., in combination, a total of about 0.5 to 8.0 percent by weight), and relatively high levels of nonionic surfactants in a dishwashing detergent formulation while providing satisfactory cleaning without unacceptable spotting and filming and without the need to add phosphates and/or a chlorinating agent.
Inventors
- 👤 Lenore E. Savio
- 👤 Madeline P. Simpson
- 👤 Raymond S. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:37
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/37; C11D3/3746; C11D3/3757; C11D3/3761; C11D1/00; C11D1/66; C11D1/72; C11D3/02; C11D3/04; C11D3/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
134 words
A non-phosphate automatic dishwashing composition comprising from about 50 to 95 percent by weight of alkali metal carbonate salts such that it contains a weight ratio of about 1:1 to 1:5 carbonate to bicarbonate, from about 0.5 to 8.0 percent by weight of about a 2:1 to a 6:1 blend of an acrylic polymer having a molecular weight of from about 500 to 1,000,000, with a copolymer of a maleic anhydride monomer of the formula: ##STR4## where R and R 1 are independently H, (C 1 -C 4 )alkyl, phenyl, (C 1 -C 4 )alkylphenyl, or phenyl(C 1 -C 4 )alkylene, and a(c 2 -C 4 ) lower olefin, said copolymer having a molecular weight of from about 500 to 1,000,000, 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 50 to 95 percent by weight of alkali metal carbonate salts such that it contains a weight ratio of about 1:1 to 1:5 carbonate to bicarbonate, from about 0.5 to 8.0 percent by weight of about a 2:1 to a 6:1 blend of an acrylic polymer having a molecular weight of from about 500 to 1,000,000, with a copolymer of a maleic anhydride monomer of the formula: ##STR4## where R and R 1 are independently H, (C 1 -C 4 )alkyl, phenyl, (C 1 -C 4 )alkylphenyl, or phenyl(C 1 -C 4 )alkylene, and a(c 2 -C 4 ) lower olefin, said copolymer having a molecular weight of from about 500 to 1,000,000, 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 10.
Claim 4
Dependent Claim
20 words
The composition of claim 1 wherein said composition contains up to about 8.0 percent by weight of an oxygen bleach.
Claim 5
Dependent Claim
23 words
The composition of claim 1 wherein the alkali metal carbonate salts contain a weight ratio of about 1:1 to 1:3 carbonate to bicarbonate.
Claim 6
Dependent Claim
18 words
The composition of claim 1 wherein the alkali metal carbonate is sodium carbonate, potassium carbonate, or mixtures thereof.
Claim 7
Dependent Claim
18 words
The composition of claim 1 wherein the alkali metal bicarbonate is sodium bicarbonate, potassium bicarbonate, or mixtures thereof.
Claim 8
Dependent Claim
30 words
The composition of claim 1 wherein the acrylic polymer is a salt or ester of acrylic or methacrylic acid and has a molecular weight of between about 1,000 to 25,000.
Claim 9
Dependent Claim
24 words
The composition of claim 7 wherein the acrylic polymer is an acrylic acid homopolymer having a molecular weight of between about 1,000 to 10,000.
Claim 10
Dependent Claim
21 words
The composition of claim 1 wherein the maleic anhydride/lower olefin copolymer has a molecular weight of between about 1,000 to 50,000.
Claim 11
Dependent Claim
23 words
The composition of claim 1 wherein the weight ratio of acrylic polymer to maleic anhydride/lower olefin copolymer is between about 2:1 to 5:1.
Claim 12
Dependent Claim
20 words
The composition of claim 10 wherein the weight ratio of acrylic polymer to maleic anhydride/lower olefin copolymer is about 3:1.
Claim 13
Dependent Claim
25 words
The composition of claim 1 wherein the weight percent of maleic anhydride/lower 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 3 to 15 percent by weight of an alkali metal silicate corrosion inhibitor.
Claim 16
Dependent Claim
13 words
The composition of claim 1 wherein the maleic anhydride mionomer is maleic anhydride.
Claim 17
Dependent Claim
11 words
The composition of claim 1 wherein the lower olefin is ethylene.
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) | 1995-10-06 | 1996-04-06 | 1996-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-06 | 2000-04-06 | 2000-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-06 | 2004-04-06 | 2004-10-06 | $7700.00 | Window Closed / Lapsed |