초록 ▼

The invention provides methods, compositions and kits for increasing the brightness retention of a fabric laundered using a hypohalite-generating bleach by employing an amount of bromide-releasing compound sufficient to provide between 0.1 to about 1.5 moles of bromine ion to mole of available chlor

The invention provides methods, compositions and kits for increasing the brightness retention of a fabric laundered using a hypohalite-generating bleach by employing an amount of bromide-releasing compound sufficient to provide between 0.1 to about 1.5 moles of bromine ion to mole of available chlorine in a wash liquor to mitigate the negative effects of said hypohalite bleach on the optical brightener present in either the wash liquor or on said fabric. The invention also applies to fabrics washed using commercial laundry detergents which typically deliver an optical brightener into said wash liquor, said optical brightener generally exhibiting instability in the presence of said hypohalite bleaches. By employing the inventive methods and/or use of the inventive compositions, enhanced protection of the optical brightener is enabled, resulting in increased brightening of the laundered fabrics, determined versus a control as an increase in the Stensby whiteness measure of the fabric by a ΔW value of greater than about 3.0.

대표청구항 ▼

I claim: 1. A method of preparing an aqueous bleaching solution with improved textile whitening performance, said method comprising: (i) addition to an aqueous wash liquor of a solid composition comprising: a) 10 to about 90 weight % of a hypohalite-generating compound; b) 1 to about 90 weight % of

I claim: 1. A method of preparing an aqueous bleaching solution with improved textile whitening performance, said method comprising: (i) addition to an aqueous wash liquor of a solid composition comprising: a) 10 to about 90 weight % of a hypohalite-generating compound; b) 1 to about 90 weight % of a bromide-releasing compound; c) 0.001 to about 10 weight % of a fluorescent whitening agent; d) optionally, 0.001 to about 50 weight % of an alkalinity source; wherein said bromide-releasing compound provides between 0.5 to about 1.0 moles of bromide ion per mole of available chlorine in said solution, and wherein said solution increases the measured textile whitening performance versus a control by a ΔW value of greater than about 3.0, wherein said fluorescent whitening agent is not hypohalite bleach stable, wherein the physical form of said solid composition is selected from the group consisting of a granule, tablet, and combinations thereof. 2. The method of claim 1 further comprising: (ii) addition of a fabric work to said aqueous wash liquor prior to, concurrent with, or after step (i), wherein said fabric work comprises a cotton containing textile work optionally treated with a fluorescent whitening agent. 3. The method of claim 1 wherein said aqueous wash liquor comprises an effective level of a commercial laundry detergent dissolved therein. 4. The method of claim 1 wherein said laundry detergent comprises a surfactant, a fluorescent whitening agent, and optionally, an alkalinity source. 5. The method of claim 1 wherein said laundry detergent further comprises a bromide-releasing compound. 6. The method of claim 1 wherein said alkalinity source is present in sufficient amount to increase the pH of said aqueous bleaching solution to a value greater than or about pH 7. 7. A method of preparing an aqueous bleaching solution with improved textile whitening performance, said method comprising: (i) addition to an aqueous wash liquor of: a) a solid composition comprising a) 10 to about 90 weight % of a hypohalite-generating compound; b) 1 to about 90 weight % of a bromide-releasing compound; c) 0.001 to about 10 weight % of a fluorescent whitening agent; d) optionally, 0.001 to about 50 weight % of an alkalinity source; wherein said solid composition is selected from the group consisting of a granule, tablet, and combinations thereof; and (ii) addition to said aqueous wash liquor of: b) a laundry detergent comprising: a bromide-releasing compound, a fluorescent whitening agent, a surfactant, and optionally, an alkalinity source; wherein said bromide-releasing compound provides between 0.5 to about 1.0 moles of bromide ion per mole of available chlorine in said solution, wherein said solution increases the measured textile whitening performance versus a control by a ΔW value of greater than about 3.0, and wherein said addition (i) and (ii) may be done in any order or simultaneously, wherein said fluorescent whitening agent is not hypohalite bleach stable. 8. The method of claim 1 wherein said hypohalite-generating compound is a hypochlorite-generating compound selected from the group consisting of sodium hypochlorite, potassium hypochlorite, calcium hypochlorite, lithium hypochlorite, magnesium hypochlorite, , chlorinated trisodium phosphate, chlorinated trisodium polyphosphate, chlorinated trisodium phosphate dodecahydrate, chlorinated isocyanuric acids, trichlorocyanuric acid, dichlorocyanuric acid, sodium dichloroisocyanurate, potassium dichloroisocyanurate, N,N'-dichloro-s-trizinetrione, N-chlorophthalamide, N-dichloro-p-toluene sulphonamide, 2,5-N,N'-dichloroazodicarbonamidine hydrochloride, N,N,N,N-tetrachloroglycoluracil, N,N-dichlorodichloroyl, N,N,N-trichloromelamine, N-chlorosuccinimide, methylene-bis(1-chloro-5,5-dimethylhydantoin), 1,3-dichloro-5-methyl-5-isobutylhydantoin, 1,3-dichloro-5-methyl-5-n-amylhydantoin, 1,3-dichloro-5,5-dimethylhydantoin, 1,4-dichloro-5,5-dimetbylhydantoin, 1,3-dichloro-5,5-diethylhydantoin, 1,4-dichloro-5,5-diethylhydantoin, 1-1-monochloro-5,5-dimethylhydantoin, sodium-para-toluenesulfochloramine, dichlorosuccinamide, 1,3,4,6-tetrachloroglycoluril, potassium and sodium salts of chloroisocyanuric, dichlorocyanuric and trichlorocyanuric acid, potassium and sodium salts of N-brominated and N-chlorinated succinimide, malonimide, phthalimide and naphthalimide, halogenated hydantoins, dibromo-and dichloro-dimethylhydantoin, chlorobromo-dimethylhydantoin, N-chlorosulfamide (haloamide), chloramine (haloamine), and mixtures thereof. 9. The method of claim 1 wherein said bromide-releasing compound is selected from the group consisting of alkali metal and alkaline earth metal bromide salts, lithium bromide, sodium bromide, sodium bromide dihydrate, potassium bromide, magnesium bromide, calcium bromide, ammonium bromide, alkylammonium bromide, dialkylammonium bromide, trialkylammonium bromide, wherein said alkyl radicals are independently selected from straight or branched aliphatic, aromatic or aryl hydrocarbon radicals of between 1 to about 24 carbon atoms, bromide-releasing ion exchange materials, and combinations thereof. 10. The method of claim 1 wherein said alkalinity source is selected from the group consisting of the alkali metal and alkaline earth metal salts of: silicate, metasilicate, polysilicate, borate, hydroxide, carbonate, carbamate, phosphate, polyphosphate, pyrophosphates, triphosphates, and tetraphosphates; ammonium hydroxide, monoethanolamine, monopropanolamine, diethanolamine, dipropanolamine, triethanolamine, 2-amino-2-methylpropanol, lysine derivatives, monoalkanolamine, dialkanolamine, trialkanolamine, monoethanolamine, diethanolamine, triethanolamine, tri(hydroxymethyl) amino methane (TRIS), 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-methyl-propanol, 2-amino-2-methyl-1,3-propanol, disodium glutamate, N-methyl diethanolamide, 2-dimethylamino-2-methylpropanol (DMAMP), 1,3-bis(methylamine)-cyclohexane, 1,3-diamino-propanol N,N'-tetra-methyl-1,3-diamino-2-propanol, N,N-bis(2-hydroxyethyl) glycine (bicine), N-tris(hydroxymethyl)methyl glycine (tricine), and mixtures thereof. 11. The method of claim 1 wherein said aqueous bleaching solution increases the measured textile whitening performance versus a control by a ΔW value of greater than about 3.0 within completion of one laundry wash cycle. 12. A method of preparing an aqueous bleaching solution with improved textile whitening performance, said method comprising the steps of: (i) addition to an aqueous wash liquor of a solid composition comprising: a) 10 to about 90 weight % hypohalite-generating compound; b) 1 to 10 weight % bromide-releasing compound; c) 0.001 to about 50 weight % alkalinity source; d) 0.001 to about 10 weight % fluorescent whitening agent; and (ii) addition to said aqueous wash liquor of a fabric work; wherein said step (i) and step (ii) may be performed in any order or may be performed simultaneously; wherein said bromide-releasing compound provides between 0.5 to about 1.0 moles of bromide ion per mole of available chlorine in said solution; wherein said solution increases the measured textile whitening performance on said fabric work versus a control by a ΔW value of greater than about 3.0; wherein said fabric work comprises at least one cotton or cellulosic textile treated with a fluorescent whitening agent; wherein said each fluorescent whitening agent is not hypohalite bleach stable; wherein said solid composition is selected from the group consisting of a granule, tablet, and combinations thereof. 13. A method of preparing an aqueous bleaching solution with improved textile whitening performance, said method comprising: (i) addition to an aqueous wash liquor of a solid composition comprising: a) 10 to about 90 weight % hypohalite-generating compound; b) 1 to about 90 weight % bromide-releasing compound; c) 0.001 to about 10 weight % fluorescent whitening agent; d) optionally, 0.001 to about 50 weight % alkalinity source; wherein said bromide-releasing compound provides between 0.5 to about 1.0 moles of bromide ion per mole of available chlorine in said solution, and wherein said solution increases the measured textile whitening performance versus a control by a ΔW value of greater than about 3.0, wherein said fluorescent whitening agent is not hypohalite bleach stable; wherein the physical form of said solid composition is selected from the group consisting of a granule, tablet, and combinations thereof. 14. The method of claim 13 wherein said hypohalite-generating compound is selected from the group consisting of hypohalite salts of potassium, lithium, calcium and magnesium; chlorinated trisodium phosphate, chlorinated trisodium polyphosphate, chlorinated trisodium phosphate dodecahydrate, and chlorinated, brominated and chlorobrominated derivatives of haloamines, haloimines, haloimides, haloamides, hydantoins, uracils, triazines, isocyanurates, cyanuric acids, succinimides, malonimides, phthalamides and naphthalimides; and mixtures thereof; wherein said bromide-releasing agent is selected from the group consisting of an alkali metal bromide salt, an alkaline earth metal bromide salt, and mixtures thereof; wherein said fluorescent whitening agent is selected from the group consisting of derivatives of stilbene, pyrazoline, coumarin, carboxylic acid, methinecyanines, dibenzothiphene-5, 5-dioxide, azoles, 5-and 6-membered-ring heterocycles, and combinations thereof.