US5152910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-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 with minor concentrations of phosphates (e.g., about 0.1 to 0.3 percent by weight as expressed as (P 2 O 5 ) 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 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 16:27
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; C11D3/06; C11D3/10
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
160 words
A low-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, a sufficient amount of an alkaline condensed phosphate salt to provide from about 0.1 to 1.5 percent by weight of (P 2 O 5 ) ion, 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
160 words
A low-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, a sufficient amount of an alkaline condensed phosphate salt to provide from about 0.1 to 1.5 percent by weight of (P 2 O 5 ) ion, 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
19 words
The composition of claim 1 wherein the alkaline condensed phosphate salt is sodium or potassium tripolyphosphate, hexametaphosphate or pyrophosphate.
Claim 6
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 7
Dependent Claim
18 words
The composition of claim 1 wherein the alkali metal carbonate is sodium carbonate, potassium carbonate, or mixtures thereof.
Claim 8
Dependent Claim
18 words
The composition of claim 1 wherein the alkali metal bicarbonate is sodium bicarbonate, potassium bicarbonate, or mixtures thereof.
Claim 9
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 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 maleic anhydride/lower olefin copolymer has a molecular weight of between about 1,000 to 50,000.
Claim 12
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 13
Dependent Claim
20 words
The composition of claim 11 wherein the weight ratio of acrylic polymer to maleic anhydride/lower olefin copolymer is about 3:1.
Claim 14
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 15
Dependent Claim
16 words
The composition of claim 1 wherein the nonionic surfactant comprises one or more ethoxylated fatty alcohols.
Claim 16
Dependent Claim
24 words
The composition of claim 1 wherein said composition contains from about 3 to 8 percent by weight of an alkali metal silicate corrosion inhibitor.
Claim 17
Dependent Claim
13 words
The composition of claim 1 wherein the maleic anhydride monomer is maleic anhydride.
Claim 18
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 |