Cleaning of hard surfaces
First Claim
Patent Images
1. A dithionite composition which upon admixture with water forms a solution of pH 5 to 9 consisting essentially of:
- a. 20-60% by weight of a dithionite selected from the group consisting of alkali metal dithionites and zinc dithionites;
b. 10-50% by weight of a water soluble sulfite selected from the group consisting of alkali metal sulfites and ammonium sulfite;
c. 5-30% by weight of a metal-complexing agent selected from the group consisting of nitrilotriacetic acid;
the alkali metal salts of nitrilotriacetic acid, ethylene diamine tetraacetic acid;
the alkali metal salts of ethylene diamine tetraacetic acid;
citric acid;
the alkali metal salts of citric acid;
gluconic acid;
the alkali metal salts of gluconic acid;
d. 0.3-5% by weight of an activator for said dithionite, wherein said activator is selected from the group consisting of OH-, Cl-, Br- or NO-2 substituted benzoquinone;
OH-, Cl-, Br- or NO-2 substituted naphthoquinone, and SO3 H- or OH- substituted anthraquinone;
e. 1-15% by weight of a thickening agent in an amount sufficient to result in said composition having a viscosity of about 20 to about 100 centipoises when admixed with water, said thickening agent being selected from the group consisting of derivatives of polysaccharides and hydroxyethylcellulose; and
f. optionally 0-10% by weight of an anionic or nonionic organic surface active agent, and 0-40% by weight of sodium sulfate.
0 Assignments
0 Petitions
Accused Products
Abstract
An improved dithionite composition suitable for preparing stock solutions comprising a dithionite, e.g., sodium dithionite, and at least 5% by weight of a water-soluble sulphite, e.g., sodium sulphite. The composition may further contain a metal-complexing agent, an activator for the dithionite, a surface-active agent and a thickening agent. The composition is applicable for the removal of metal dust soiling and metal oxide stains, particularly rust stains, from surfaces.
-
Citations
4 Claims
-
1. A dithionite composition which upon admixture with water forms a solution of pH 5 to 9 consisting essentially of:
-
a. 20-60% by weight of a dithionite selected from the group consisting of alkali metal dithionites and zinc dithionites; b. 10-50% by weight of a water soluble sulfite selected from the group consisting of alkali metal sulfites and ammonium sulfite; c. 5-30% by weight of a metal-complexing agent selected from the group consisting of nitrilotriacetic acid;
the alkali metal salts of nitrilotriacetic acid, ethylene diamine tetraacetic acid;
the alkali metal salts of ethylene diamine tetraacetic acid;
citric acid;
the alkali metal salts of citric acid;
gluconic acid;
the alkali metal salts of gluconic acid;d. 0.3-5% by weight of an activator for said dithionite, wherein said activator is selected from the group consisting of OH-, Cl-, Br- or NO-2 substituted benzoquinone;
OH-, Cl-, Br- or NO-2 substituted naphthoquinone, and SO3 H- or OH- substituted anthraquinone;e. 1-15% by weight of a thickening agent in an amount sufficient to result in said composition having a viscosity of about 20 to about 100 centipoises when admixed with water, said thickening agent being selected from the group consisting of derivatives of polysaccharides and hydroxyethylcellulose; and f. optionally 0-10% by weight of an anionic or nonionic organic surface active agent, and 0-40% by weight of sodium sulfate. - View Dependent Claims (2, 3, 4)
-
Specification