Claims
- 1. A method of cleaning plastic members comprising:
exposing a plastic member to an aqueous liquid composition comprising:
water; at least one acid selected from the group consisting of carboxylic acids, hydroxycarboxylic acids, and inorganic acids other than phosphoric acid wherein the at least one acid is in an amount from about 1.0 to about 30 milliequivalents per kilogram of total composition (“mEq/kg”); and an amphoteric surfactant wherein the amphoteric surfactant in an amount from about 0.01 to about 20 grams per kilogram of total composition g/kg the aqueous liquid composition having a pH from about 2.0 to about 6.1 and having a reduced etch attack on metal as compared to an aqueous composition comprising from about 1.0 to about 30 milliequivalents per kilogram of total composition (“mEq/kg”) of acids selected from the group consisting of carboxylic, hydroxycarboxylic, and inorganic acids, and not containing the amphoteric surfactant.
- 2. The method of claim 1, wherein the pH range is from about 2.5 to about 5.7.
- 3. The method of claim 1, wherein the at least one acid comprises from about 5 to 25 milliequivalents per kilogram.
- 4. The method of claim 1, wherein the amphoteric surfactant is present in an amount from about 0.01 to about 10 grams per kilogram of total composition.
- 5. The method of claim 1, wherein the at least one acid comprises at least one carboxylic acid.
- 6. The method of claim 5, wherein the at least one acid is made up of molecules with not more than six carbon atoms with at least three total —OH and —COOH groups per molecule.
- 7. The method of claim 1, wherein the amphoteric surfactant contains positively charged amine functionality and negatively charged carboxylic acid functionality at a neutral pH.
- 8. The method of claim 7, wherein the amphoteric surfactant has the general structure
- 9. The method of claim 1, further comprising from 5.0 to 40 milliequivalents per kilogram of salts, the salts being selected from the group consisting of anions of carboxylic acid, anions of hydrocarboxylic acid, acids, inorganic acids, and anions of the same acid or acids as defined for the carboxylic and/or acid or hydrocarboxylic acids and/or inorganic acids.
- 10. An aqueous liquid composition comprising:
water; at least one acid selected from the group consisting of carboxylic acids, hydroxycarboxylic acids, and inorganic acids other than phosphoric acid wherein the at least one acid is present in an amount from about 100 to about 3,000 milliequivalents per kilogram of total composition (“mEq/kg”); and an amphoteric surfactant wherein the amphoteric surfactant is present in an amount from about 0.01 to about 20 grams per kilogram of total composition (“g/kg”), the aqueous liquid composition having a pH from about 2.0 to about 6.1.
- 11. The aqueous liquid composition of claim 10, wherein the water is present in the composition in a weight percent of about 86%, based on the total weight % of the composition, and wherein the amphoteric surfactant is present in the composition in a weight percent of about 6%, based on the total weight of the composition, and wherein the amphoteric surfactant in the composition in a weight percent of about 0.35%, based on the total weight of the composition; and
wherein the composition further comprises:
a 45% solution of potassium hydroxide present in the composition in a weight percent about 3.5%, based on the total weight of the composition; sodium cumene sulfonate present in the composition in a weight percent about 1.6%, based on the total weight of the composition; sodium bisulfite present in the composition in a weight percent about 0.08%, based on the total weight of the composition; and a non-ionic surfactant present in the composition in a weight percent about 2.2%, based on the total weight of the composition.
- 12. An aqueous liquid composition comprising a 0.5 to 4% by weight solution of the aqueous liquid composition of claim 10.
- 13. An aqueous liquid composition comprising a 0.5 to 4% by weight solution of the aqueous liquid composition of claim 11.
- 14. An aqueous liquid composition comprising:
water; at least one acid selected from the group consisting of carboxylic acids, hydroxycarboxylic acids, and inorganic acids other than phosphoric acid wherein the at least one acid is present in an amount from about 1.0 to about 30 milliequivalents per kilogram of total composition (“mEq/kg”); and an amphoteric surfactant wherein the amphoteric surfactant is present in an amount from about 0.01 to about 20 grams per kilogram of total composition (“g/kg”), the aqueous liquid composition having a pH from about 2.0 to about 6.1 and having a reduced etch attack on metal as compared to an aqueous composition comprising from about 1.0 to about 30 milliequivalents per kilogram of total composition (“mEq/kg”) of acids selected from the group consisting of carboxylic, hydroxycarboxylic, and inorganic acids, and not containing the amphoteric surfactant.
- 15. The aqueous liquid composition of claim 14, wherein the amphoteric surfactant is present in an amount from about 0.01 to about 10 grams per kilogram of total composition.
- 16. The aqueous liquid composition of claim 14, wherein the at least one acid comprises at least one carboxylic acid.
- 17. The aqueous liquid composition of claim 16, wherein the at least one acid is made up of molecules with not more than six carbon atoms with at least three total —OH and —COOH groups per molecule.
- 18. The aqueous liquid composition of claim 14, wherein the amphoteric surfactant contains positively charged amine functionality and negatively charged carboxylic acid functionality at a neutral pH.
- 19. The aqueous liquid composition of claim 14, further comprising from 5.0 to 40 milliequivalents per kilogram of salts, the salts being selected from the group consisting of anions of carboxylic acid, anions of hydrocarboxylic acid, acids, inorganic acids, and anions of the same acid or acids as defined for the carboxylic and/or acid or hydrocarboxylic acids and/or inorganic acids.
- 20. The aqueous liquid composition of claim 14, further comprising a non-ionic surfactant.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of U.S. provisional application Serial No. 60/277,388 filed Mar. 20, 2001.
Provisional Applications (1)
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Number |
Date |
Country |
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60277388 |
Mar 2001 |
US |