Patent ID: 7199094
Filing Date: 2007-04-03
Classification: C11D

Abstract:
1. A process for removing rust stains from a hard surface comprising the steps of: providing an aqueous acidic hard surface cleaning composition which comprises: an acidic constituent which is a mixture of citric acid and formic acid; 0.001–10% by weight of at least one anionic surfactant; 0.001–10% by weight of a thickener selected from the group consisting of cellulose, alkyl celluloses, alkoxy celluloses, hydroxy alkyl celluloses, alkyl hydroxy alkyl celluloses, carboxy alkyl celluloses, carboxy alkyl hydroxy alkyl celluloses, succinoglycan, xanthan gum, guar gum, locust bean gum, tragacanth gum or derivatives thereof, clays selected from the group consisting of kaolinite, dicktite, hectorite, bentonite, nacrite, halloysite, endillite, chrysotile, amesite, beidellite, nontronitc, saponite, sauconite, illites; glauconite, chlorite, vermiculite, attapulgite, sepiolite, allophane, and imogolite, and silicas selected from the group consisting of diatomite, precipitated silica and fumed silica, and mixtures thereof; 10–30% by weight of a scrubbing agent selected from the group consisting of quartzes, siliceous chalk, diatomaceous earth, colloidal silicon dioxide, alkali metasilicates, organic abrasive materials selected from the group consisting of polyolefins, polyethylenes, polypropylenes, polyesters, polystyrenes, acetonitrile-butadiene-styrene resins, melamines, polycarbonates, phenolic resins, epoxies and polyurethanes and mixtures thereof; 0–10% by weight of one or more optional constituents; and the balance to 100% by weight, water wherein the pH of the composition is less than 6.