Low-residue brightening compositions and methods for using them

Details Low-residue brightening compositions and methods for using them Low-residue brightening compositions and methods for using them

C - Chemistry, Metallurgy

11

D

134/5.2

C11D 3/395 (2006.01)

Patent

CA 1195203

Abstract The separately-packaged parts of the disclosed, liquid two-part brightening compositions can be combined and then sprayed or otherwise applied onto discolored surfaces (particularly internal walls and ceilings) for the purpose of treating the discoloration and substantially restoring a stain-free appearance. These compositions leave a minimal residue after spraying, which residue is substantially free of titratable chlorine after less than 60 hours at normal ambient temperatures. The spraying of the composition is generally not complicated by formation of stable foam. One part of the two-part system comprises an aqueous solution of a hypochlorite salt (e.g. NaOCl) and the other, separately packaged part comprises a nonionic surfactant dissolved in a water-soluble mono-lower alkyl ether of ethylene or diethylene glycol. Water is a suitable diluent for either or both parts. The preferred nonionic surfactants have emulsifying and/or detergent and/or surface tension-lowering properties and are ethoxylates, e.g. higher aliphatic alcohols condensed with 3-40 moles of ethylene oxide. HLB values of these surfactants are preferably below 18, more preferably below 14. The surfactants with the lower HLB values can help to control foam during spraying and help eliminate the need for an additional ingredient specifically for defoaming. It is preferred to limit these compositions to the fewest possible ingredients, and residue-forming or substantially nonvolatile solids or liquids other than the aforementioned active ingredients are preferably avoided.

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