US4521332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highly alkaline cleaning dispersion
Assignee: Arkema Inc
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Filing: 1982-05-03
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Granted: 1985-06-04
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Expires: 2002-05-03
Abstract
Abstract A highly alkaline aqueous cleaning dispersion comprising sodium hydroxide, a bulking agent such as sodium carbonate and polyacrylic acid dispersing agent is disclosed and claimed. The dispersion when diluted with water is particularly useful in cleaning strip steel after it leaves the rolling mills prior to annealing or coating. A method of preparing the dispersion is also claimed.
Inventors
- 👤 David J. Milora
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:42
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/14; C23G1/19; C11; C11D; C11D3/00; C11D3/16; C11D3/37; C11D3/3746; C11D3/3757; C11D3/3765; C11D7/00; C11D7/02; C11D7/04; C11D7/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
136 words
A liquid highly alkaline aqueous cleaning dispersion which resists separation into layers said dispersion containing at least about 40% solids by weight and comprising the following ingredients expressed as percent by weight: Sodium hydroxide: 10 to 45% Alkali metal or ammonium salt of polyacrylic acid having a molecular weight within the range of 500 to 12,000: 0.04% to gelling Alkali metal phosphate builder: 2 to 15% Nonionic surfactant: 0.3 to 5% Chelator: 0.25 to 3% Sodium or potassium carbonate as a bulking agent: 0.5 to 20% Water: Balance in which the chelator is one or more members selected from group consisting of sorbitol, gluconic acid, glucoheptonic acid, mannitol, ascorbic acid, sorbose, tannic acid, ethylenediamine tetraacetic acid, sodium chrom glucosate, diglycolic acid, aspartic acid, d-gluconolactone, l-rhamnose, nitrilotriacetic acid, and the sodium or potassium salts of the acids.
Claim 2
Dependent Claim
136 words
A liquid highly alkaline aqueous cleaning dispersion which resists separation into layers said dispersion containing at least about 40% solids by weight and comprising the following ingredients expressed as percent by weight: Sodium hydroxide: 10 to 45% Alkali metal or ammonium salt of polyacrylic acid having a molecular weight within the range of 500 to 12,000: 0.04% to gelling Alkali metal phosphate builder: 2 to 15% Nonionic surfactant: 0.3 to 5% Chelator: 0.25 to 3% Sodium or potassium carbonate as a bulking agent: 0.5 to 20% Water: Balance in which the chelator is one or more members selected from group consisting of sorbitol, gluconic acid, glucoheptonic acid, mannitol, ascorbic acid, sorbose, tannic acid, ethylenediamine tetraacetic acid, sodium chrom glucosate, diglycolic acid, aspartic acid, d-gluconolactone, l-rhamnose, nitrilotriacetic acid, and the sodium or potassium salts of the acids.
Claim 3
Dependent Claim
28 words
The cleaning dispersion of claim 1 in which the alkali metal or ammonium salt of polyacrylic acid is present at a concentration of 0.04 to 4% by weight.
Claim 4
Dependent Claim
45 words
The cleaning dispersion of claim 1 in which the alkali metal phosphate builder is one or more members selected from the group consisting of sodium hexametaphosphate, sodium tripolyphosphate, tetrapotassium pyrophosphate, tetrasodium pyrophosphate, trisodium phosphate, disodium phosphate, monosodium phosphate, monopotassium phosphate, dipotassium phosphate and tripotassium phosphate.
Claim 5
Dependent Claim
22 words
The cleaning dispersion of claim 1 in which the alkali metal phosphate builder is sodium hexametaphosphate and the chelator is sodium gluconate.
Claim 6
Dependent Claim
14 words
The cleaning dispersion of claim 1 in which the bulking agent is sodium carbonate.
Claim 7
Dependent Claim
29 words
The cleaning composition of claim 1 wherein the nonionic surfactant is selected from the group consisting of linear and branch chain ethoxylated alcohols and ethoxylated alkyl and dialkyl phenols.
Claim 8
Dependent Claim
66 words
A liquid highly alkaline aqueous cleaning dispersion which resists separation into layers comprising the following ingredients expressed as percent by weight: Sodium hydroxide aqueous solution (50% NaOH): 84.25% Sodium salt of polyacrylic acid having a molecular weight within the range of 500 to 12,000 (40% conc.): 1.0% Sodium hexametaphosphate: 2.0% Nonionic surfactant: 1.0% Sodium gluconate: 0.5% Tetrasodium ethylenediamine tetraacetic acid: 0.25% Sodium carbonate: 2.0% Water: 9.0%.
Claim 9
Dependent Claim
66 words
A liquid highly alkaline aqueous cleaning dispersion which resists separation into layers comprising the following ingredients expressed as percent by weight: Sodium hydroxide aqueous solution (50% NaOH): 84.25% Sodium salt of polyacrylic acid having a molecular weight within the range of 500 to 12,000 (40% conc.): 1.0% Sodium hexametaphosphate: 2.0% Nonionic surfactant: 1.0% Sodium gluconate: 0.5% Tetrasodium ethylenediamine tetraacetic acid: 0.25% Sodium carbonate: 2.0% Water: 9.0%.
Claim 10
Dependent Claim
61 words
A liquid highly alkaline aqueous cleaning dispersion which resists separation into layers comprising the following ingredients expressed as percent by weight: Sodium hydroxide aqueous solution (50% NaOH): 21.0% Sodium hexametaphosphate: 10.0% Sodium gluconate: 0.50% Tetrasodium ethylenediamine tetraacetic acid: 0.25% Sodium salt of polyacrylic acid having a molecular weight within the range of 500 to 12,000: 1.0% Sodium carbonate: 20.0% Water: 47.25%.
Claim 11
Dependent Claim
61 words
A liquid highly alkaline aqueous cleaning dispersion which resists separation into layers comprising the following ingredients expressed as percent by weight: Sodium hydroxide aqueous solution (50% NaOH): 21.0% Sodium hexametaphosphate: 10.0% Sodium gluconate: 0.50% Tetrasodium ethylenediamine tetraacetic acid: 0.25% Sodium salt of polyacrylic acid having a molecular weight within the range of 500 to 12,000: 1.0% Sodium carbonate: 20.0% Water: 47.25%.
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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) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |