C - Chemistry – Metallurgy – 11 – D
Patent
C - Chemistry, Metallurgy
11
D
C11D 3/20 (2006.01) C11D 1/66 (2006.01) C11D 3/48 (2006.01)
Patent
CA 2095533
2095533 9210560 PCTABS00013 An effective phosphate free and organic solvent free aqueous acidic cleaner for soiled plastic surfaces is an aqueous solution or dispersion that has a pH in the range from about 4.4 - about 6.1; that has a buffering capacity sufficiently high that at least 0.06 milliequivalents of a strong alkali per liter of the composition must be added to raise the pH of the composition by 0.1 pH unit; and that consists essentially of water and: (A) from about 0.4 to about 10 milliequivalents per kilogram of total composition (''mEq/kg'') of acids selected from the group consisting of hydroxycarboxylic and dicarboxylic acids; (B) from about 1.4 to about 20 mEq/kg of salts containing anions of acids selected from the group consisting of hydroxycarboxylic and dicarboxylic acids; and (C) from about 0.21 to about 3.3 grams per kilogram of total composition (''g/kg'') of nonionic surfactant; and, optionally, (D) an amount of hydrotrope material that is from about 0.25 to about 0.75 times the amount in g/kg of component (C); and (E) a sufficient amount of biocidal material to inhibit growth of any bacteria and fungi that may be present in the composition.
Fetherstonhaugh & Co.
Henkel Corporation
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