ES2303076T3 - BLUE AND RED WHITENING COMPOSITIONS. - Google Patents

Abstract

The present invention concerns photo-bleaching with a dye and in particular the bleaching of laundry items with a bleaching composition comprising : a) from 0.0001 to 0.1 Wt/ Wt % of a photo-reactive red dye having a peak in the visible in the range 500 to 550 nm ; b) from 0.0001 Wt/ Wt % to 0.1 Wt/ Wt of a blue dye lambda max 580-640 nm ; c) from 0 to 40 Wt/ Wt % other bleaching species; and, d) the balance carriers and adjunct ingredients to 100 Wt/ Wt % of the total bleaching composition.

Description

Bleaching compositions blue and red.

       \ vskip1.000000 \ baselineskip
    

Field of the Invention

The present invention relates to photo-bleached products, in particular bleached dirty clothes.

       \ vskip1.000000 \ baselineskip
    

Background of the invention

In a conventional bleaching treatment, a substrate such as a cloth or other fabric for washing is subjected to hydrogen peroxide, or to substances that can generate radicals hydroperoxyl, such as inorganic or organic peroxides.

A preferred approach to generate hydroperoxyl bleaching radicals is the use of inorganic peroxides coupled with organic precursor compounds. These systems are used for many commercial powder detergents. For example, various European systems rely on tetraacetyl ethylenediamine (TAED) as an organic precursor coupled with sodium perborate or sodium percarbonate, while in the United States bleaching products for washing are typically based on sodium nonanoyloxybenzenesulfonate (SNOBS) as an organic precursor coupled with perborate sodium Alternatively, or additionally, hydrogen peroxide and peroxy systems can be activated by bleaching catalysts, such as by iron complexes and the N4Py ligand (ie N, N- bis (pyridin-2-yl-methyl) -bis (pyridin -2-yl) methylamine) described in WO95 / 34628.

Another approach to bleaching is the one that uses radical photo-initiators, which are generally organic chemical compounds that absorb light, particularly UV light, form reactive radicals. They are widely used for initiate the polymerization of alkenes and thus coatings of curing They can also be used as photoblanking agents such as It is analyzed in WO 01/07549 A (GB 9917451). The Radical photoinitiators, in general, are analyzed by H.F. Gruber in Prog. Polym. Sci. Vol 17, 953-1044.

US 4,668,418 describes compositions of photoactivatable bleaching comprising a xanthene dye and a cyclic tertiary amine.

       \ vskip1.000000 \ baselineskip
    

Summary of the invention

It has been discovered that the treatment of a stained fabric with a bleaching composition comprising a red photo-reactive dye that has a lambda max in the visible in the range of 500 to 550 nm along with a blue dye that has a lambda max in the visible in the 580 to 640 nm range produces a whitened bleached tissue boosted The bleaching activity is particularly good against to catechol type spots, polyphenolic compound type spots and stains type polycyclic hydroxylated aromatic compounds.

These catechol stains, stains type polyphenolic compounds and aromatic compound type spots polycyclic hydroxylates are the result of chromophores found in tea, coffee, blackberry, blueberry, blackcurrant, Red wine, banana and the like. These spots are characteristic and other than oily food stains such as tomato oil, curry oil stains, mango stains, bija-derived spots, paprika-derived spots, and spots sebum derivatives etc.

The present invention provides a bleaching composition comprising: a) from 0.0001 to 0.1% w / w of a red photo-reactive dye that has a peak in the visible in the range of 500 to 550 nm; b) of 0.0001% 0.1% w / w p / p of a blue lambda max dye 580-640 nm; c) from 0 to 40% w / w of other species of bleached; and, d) balance vehicles and accessory ingredients up to 100% w / w of the total bleaching composition.

Most preferred is that after the addition of a unit dose of the bleaching composition to an environment aqueous a wash liquor is provided that has a pH in the range from 8 to 11.

The bleaching composition can be used by itself alone or in conjunction with other bleaching species. It preferred that the other bleaching species, if used, have different bleaching profiles to the bleaching composition of only Photo-reactive red dye. The profile of bleached photo bleach spots known as radical photoinitiators, it is generally the of carotenoid spots, for example tomato spots that is similar to the bleaching profile of bleaching catalysts "with air".

Red dyes Photo-reagents Xanthene type dyes are Preferred, particularly based on the structure:

one

       \ vskip1.000000 \ baselineskip
    

in which the dye can replaced by halogens and other elements / groups. Are examples Particularly preferred Food Red 14 and Bengali Rose, Floxin B, Eosin Y. The fact that these dyes are brightly red makes its application in unusual textile bleached because its use would be expected to produce discolored tissues in place of bleached fabrics. When using Food Red 14 only as the kind of bleaching, the consumer makes sure in the context of washing that the bleach used is mild to cause of the fact that it is an acceptable food additive. The food colors are used to enhance the visual appearance of many foods. As humans consume them, they experience a rigorous trial and exam to ensure that they do not represent risk for the Health.

The present invention also relates to a procedure of photo-bleaching of a fabric.

The light used for the Photo-bleached can be sunlight, light fluorescent or that of a normal bulb.

Photo bleaching is still effective when the concentration of the red dye photo-reactive on the fabric / fabric is so low that It is barely noticeable to the human eye. It is preferred that the dye lose photo-intensity quickly with irradiation of light.

The present invention can be applied locally, the appropriate pretreatment means for application include sprayers, pens, ball devices in Roller, bars, soft solid applicator sticks.

A unit dose as used herein it is a particular amount of the bleaching composition used For a type of washing. The unit dose may be in the form of a defined volume of powder, granules or tablet.

       \ vskip1.000000 \ baselineskip
    

Detailed description of the invention

A photo-reactive dye is one that when exposed to light in the wavelength range of 300-700 nm, more preferably 400 to 700 nm, undergoes a photochemical process to produce a reactive / excited species that is capable of bleaching Colored stained material, such as tea stains. The photo-reaction must be able to happen in minutes to hours under normal lighting conditions (40-400 W m -2 in the range of 400 to 700
nm).

A photo-reactive red dye it is one that has a lambda max in the visible in the 500 interval at 550 nm, for example, Food Red 14, Bengali Rose, Floxin B, and Eosina Y.

A blue dye is one that has a lambda max in the visible in the range of 580 to 640 nm and can be direct or acid blue dyes such as those listed by the Society of Dyers and Colourists and the American Association of Textile Chemists and Colorists (see http://www.colour-index.org). Dyes Direct and acidic can be selected from azo dyes, bis-azo, anthraquinone, triarylmethane. Dyes Preferred are clearly those that are deposited on the cotton. Preferred direct dyes and acids are those that are deposited on cotton but do not accumulate on the cotton after multiple washes, examples of dyes that do not they accumulate are acid black 1, acid blue 29, acid blue 113, and acid black 24. Dyes that are particularly preferred are deposited on cotton but not deposited on nylon, such as acid black 1 and acid blue 29. The blue dye also serves to mask any residual red color, providing the combination of red and blue a violet color that enhances the whiteness of the fabric.

The red dye photo-reactive Preferred is Food Red 14 (Erythrosine B) (E127; CI number 45430) (CAS 16423-68-0) which is a Widely used red food coloring, see Hunger K.

Industrial dyes: Chemistry Properties And Applications. Wiley-VCH, Heidelberg 2003.

The concentration of the red dye Photo-reagent in a wash liquor is 5 ppb a 1000 ppm, preferably from 10 ppb to 100 ppm, more preferably from 50 ppb to 5 ppm, and more preferably from 100 ppb to 1 ppm. Too  the same concentration can be used for a stain treatment of a dye or a commercial liquid formulation. A adequate concentration in a powder detergent would be 0.0001% 0.1% w / w w / w, more preferably it is 0.001% w / w 0.01% p / p.

A dye in the context of the present invention is described as an organic compound with a maximum of optical absorption in the visible wavelength range of 400-700 nm, so that the extinction coefficient in the maximum in the visible one it is greater than 5000 mol / l / cm, more preferably greater than 10,000 mol / l / cm.

The use of a blue dye to give hue described in application GB 0314211.4 filed on 6/18/2003 published as document WO 2005/003276 A. Thus, the yellowing of whites can be reduced and given a blue tint aesthetically pleasing to the wash liquor. It is preferred that the Red dye: Blue dye is in the 9: 1 to 1: 9 ratio.

The concentration of the blue dye in a liquor Wash is 5 ppb to 1000 ppm, preferably 10 ppb to 100 ppm, more preferably from 50 ppb to 5 ppm, and more preferably from 100 ppb at 1 ppm. The same concentration can also be used to a stain treatment of a dye or a liquid formulation commercial. An appropriate concentration in a powder detergent it would be 0.0001% w / w to 0.1% w / w, more preferably it is 0.001% p / p at 0.01% p / p.

Of the blue dyes, dyes are preferred nouns for cotton over non-dyes for cotton. In this regard, a substantive dye for cotton is defined as in GB application 0314211.4 published as the WO 2005/00 32 76 A.

Other Bleached Species

The bleaching composition can also contain other bleaching components, for example others photo-bleaches, a metallic catalyst of transition that is present in a bleaching composition that is substantially devoid of peroxyl species, and systems of peroxyl bleaching. An example of a Additional preferred photo bleach is vitamin K3

The use of bleaching catalysts for stain removal has developed in recent years and can be used in the present invention. Examples of transition metal catalysts are found that can be used, for example, in: WO0060045, WO0248310, WO0029537 and WO0012667. The catalysts can be used to catalyze the bleaching with peroxyl or "with air" as described in WO0248301. The catalyst can, alternatively, be provided as the free ligand that forms an in situ complex.

The bleaching composition when used as an "air" bleaching composition is substantially devoid of a peroxygen bleach or a system of Bleached based on peroxy or generating peroxyl. It is believed that spontaneous hydroperoxides in an oily stain serve to bleach the stain together with the catalyst.

The expression "substantially devoid of a peroxygen bleach or a bleaching system based on peroxi or that generates peroxyl "must be understood within the environment of the invention. It is preferred that the composition has a content of peroxyl species as low as possible. It is preferred that the bleaching formulation contains less than 1% w / w concentration total of peroxide or hydrogen peroxide or source thereof, preferably the bleaching formulation contains less than 0.3% w / w total concentration of peracid or hydrogen peroxide or source thereof, more preferably the composition of bleached is devoid of peracid or hydrogen peroxide or source of them.

In contrast to air bleaching it It requires a kind of peroxyl. The peroxy bleaching species it can be a compound, which is capable of producing peroxide of hydrogen in aqueous solution. Sources are well known in the art. of hydrogen peroxide. They include alkali metal peroxides, organic peroxides such as urea peroxide, and persales inorganic, such as perborates, percarbonates, perfosphates, alkali metal persilicates and persulfates. Can also be suitable mixtures of two or more of said compounds.

Particularly preferred are sodium perborate tetrahydrate and, especially, sodium perborate monohydrate. Sodium perborate monohydrate is preferred because of its high active oxygen content. Sodium percarbonate may also be preferred for environmental reasons. The amount thereof in the composition of the invention will usually be in the range of about 1-35% by weight, preferably 5-25% by weight. One skilled in the art will appreciate that these amounts can be reduced in the presence of a bleaching precursor, for example, N, N, N ', N' -tetraacetyl ethylenediamine (TAED).

Another system that generates hydrogen peroxide suitable is a combination of a C1-C4 alkanol oxidase and a C1-C4 alkanol, especially a combination of methanol oxidase (MOX) and ethanol. Such combinations are described in International Application PCT / EP 94/03003 (Unilever), publication number WO95 / 07972 A.

Alkylhydroxy peroxides are another class of peroxy bleaching compounds. Examples of these materials include cumene hydroperoxide and t -butyl hydroperoxide.

Peroxyacids may also be suitable. organic as the peroxy bleaching compound. Sayings Materials usually have the general formula:

2

in which R is an alkylene group or substituted alkylene containing from 1 to about 20 atoms carbon, which optionally has an internal amide bond; or a phenylene or substituted phenylene group; and Y is hydrogen, halogen, alkyl, aryl, an aromatic or non-aromatic imido group, a group COOH or

3

or an ammonium group quaternary.

Typical monoperoxy acids useful in this Document include, for example:

(i) peroxybenzoic acid and acids substituted peroxybenzoic in the ring, for example acid peroxy-alpha-naphthoic;

(ii) aliphatic, substituted aliphatic and arylalkyl monoperoxy acids, for example, peroxylauric acid, peroxystearic acid and N, N- phthaloylaminoperoxy caproic acid (PAP); Y

(iii) acid 6-octylamino-6-oxo-peroxyhexanoic.

Typical diperoxyacids useful in this Document include, for example:

(iv) acid 1,12-diperoxidedecanedioic acid (DPDA);

(v) acid 1,9-diperoxyazelaic;

(vi) diperoxybrasilic acid; acid diperoxisebasic and diperoxyisophthalic acid;

(vii) acid 2-decyldiperoxybutane-1,4-dioetic; Y

(viii) acid 4,4'-sulfonylbisperoxybenzoic.

Peroxyacid compounds are also suitable inorganic, such as, for example, potassium monopersulfate (MPS). If organic or inorganic peroxyacids are used as the compound of peroxygen, the amount of it will normally be within the range of about 2-10% by weight, preferably 4-8% by weight.

They are widely known and described. peroxyacid bleach precursors in the literature, such as in British Patents 836988; 864,798; 907,356; 1,003,310 and 1,519,351; German Patent 3,337,921; The document EP-A-0185522; The document EP-A-0174132; The document EP-A-0120591; and the Patents of United States No. 1,246,339; 3,332,882; 4,128,494; 4,412,934 and 4,675,393.

Another useful class of bleaching precursors of peroxyacid is that of cationic precursors, that is, precursors of quaternary ammonium substituted peroxyacid as described in U.S. Patent Nos. 4,751,015 and 4,397,757, in EP-A0284292 and the document EP-A-331,229. Examples of peroxyacid bleaching precursors of this class are:

2- ( N, N, N -trimethyl ammonium) ethyl sodium-4-sulfophenyl carbonate chloride (SPCC);

N -octyl- N, N- dimethyl-N10-carbophenoxy decyl ammonium chloride (ODC);

3- ( N, N, N -trimethyl ammonium) propyl sodium-4-sulfophenyl carboxylate; Y

N, N, N -trimethyl ammonium toluyloxy benzene sulfonate.

A special class of bleaching precursors It is formed by the cationic nitriles described in the document EP-A-303.520 and in the Memoirs Descriptions of European Patents No. 458,396 and 464,880.

Any one of these precursors can be used. peroxyacid bleach in the present invention, although Some may be more preferred than others.

From the previous classes of precursors bleaches, the preferred classes are esters, including acyl phenol sulfonates and acyl alkyl phenol sulfonates; the acyl amides; and peroxyacid precursors substituted with quaternary ammonium including nitriles cationic

Examples of such preferred peroxyacid bleaching precursors or activators are sodium 4-benzoyloxy benzene sulfonate (SBOBS); N, N, N ', N' -tetraacetyl ethylenediamine (TAED); Sodium 1-methyl-2-benzoyloxy benzene-4-sulfonate; Sodium 4-methyl-3-benzoyloxy benzoate; SPCC; trimethyl ammonium toluyloxybenzene sulfonate; sodium nonanoyloxybenzene sulfonate (SNOBS); Sodium 3,5,5-trimethyl hexanoyloxybenzene sulfonate (STHOBS); and substituted cationic nitriles.

Other classes of bleaching precursors for your Use with the present invention are found in the document WO0015750, for example sulfonate of 6- (nonanamidocaproyl) oxybenzene.

The precursors can be used in an amount of up to 12%, preferably 2-10% by weight, of the composition.

Balancing Vehicles and Ingredients Accessories

The following are examples of balance vehicles and appropriate accessory ingredients.

Generally these are surfactants, adjuvants, foaming agents, agents anti-foaming agents, solvents, and enzymes. The use and amounts of these components are such that the composition of bleached works depending on economic factors, Environmental and use of bleaching composition. Be prefers that the bleaching composition comprises 5 to 40% w / w of a surfactant having an HLB greater than 15.

Up to a point, the composition comprises a surfactant and optionally other detergent ingredients conventional. The invention in its second aspect provides a enzymatic detergent composition comprising 0.1-50% in weight, based on the total detergent composition, of one or more surfactants This surfactant system may, in turn, comprise from 0 - 95% by weight of one or more anionic surfactants and from 5 to 100% by weight of one or more non-ionic surfactants. The system surfactant may additionally contain detergent compounds amphoteric or zwitterionic, but this is usually not desired due to its relatively high cost. Detergent composition Enzymatic according to the invention will generally be used as a dilution in water of approximately 0.05 to 2%.

In general, non-ionic surfactants and Anionic surfactant system can be chosen among the surfactants described in "Surface Active Agents" Vol. 1, by Schwartz & Perry, Interscience 1949, Vol. 2 by Schwartz, Perry & Berch, Interscience 1958, in the current edition of "McCutcheon's Emulsifiers and Detergents" published by Manufacturing Confectioners Company or in "Tenside-Taschenbuch", H. Stache, 2nd Edn., Carl Hauser Verlag, 1981. Non-ionic detergent compounds suitable that can be used include, in particular, the products reaction of compounds having a hydrophobic group and an atom of reactive hydrogen, for example, aliphatic alcohols, acids, amides or alkylphenols with alkylene oxides, especially oxide of ethylene alone or with propylene oxide. Detergent compounds non-ionic specific are alkyl condensates C 6 -C 22 phenol-ethylene oxide, generally 5 to 25 EO, that is, 5 to 25 oxide units of ethylene per molecule, and alcohol condensation products linear or branched primary or secondary C 8 -C 18 aliphatic with ethylene oxide, generally from 5 to 40 EO.

Suitable anionic detergent compounds that can be used are usually alkali metal salts water soluble sulfates and organic sulphonates that have alkyl radicals containing from about 8 to approximately 22 carbon atoms, using the term alkyl to include the alkyl part of higher acyl radicals. Examples of suitable synthetic anionic detergent compounds with sodium and potassium alkyl sulfates, especially those obtained sulfating higher C 8 -C 18 alcohols, produced, for example, from tallow or coconut oil, alkyl C 9 -C 20 sodium benzene sulfonates and potassium, particularly C 10 -C 15 alkyl benzene sodium linear secondary sulfonates; and alkyl glyceryl sodium ether sulfates, especially ethers of alcohols superior derivatives of tallow or coconut oil and synthetic alcohols Petroleum derivatives. Anionic detergent compounds Preferred are C 11 -C 15 alkyl benzene sodium sulfonates and C 12 -C 18 alkyl sodium sulfates Surfactants such as those described in the document EP-A-328 177 (Unilever), which show desalting resistance, the surfactants of alkyl polyglycoside described in the document EP-A-070 074, and monoglycosides of I rent.

Preferred surfactant systems are mixtures of anionic detergents with non-ionic detergents, in particular the groups and examples of anionic surfactants and not ionic indicated in the document EP-A-346 995 (Unilever). Is Especially preferred is the surfactant system which is a mixture of an alkali metal salt of a primary alcohol sulfate C 16 -C 18 together with an alcohol ethoxylate primary C 12 -C 15 of 3-7 EO

The nonionic detergent is preferably present in quantities greater than 10%, for example the 25-90% by weight of the surfactant system. The anionic surfactants may be present, for example, in amounts in the range of about 5% to approximately 40% by weight of the surfactant system.

The composition may contain enzymes Additional as found in WO 01/00768 A1 page 15, line 25 to page 19, line 29.

Adjuvants may also be present, polymers and other enzymes as optional ingredients as found in WO0060045.

Adjuvants may also be present. suitable detergency as optional ingredients as found in WO0034427.

The composition of the present invention may be used for cleaning dirty clothes, cleaning hard surfaces (including cleaning of toilets, work surfaces in kitchens, floors, washing of mechanical utensils etc.). As is known in general lines in the art, bleaching compositions They are also used in wastewater treatment, bleaching of pulp during papermaking, leathermaking, dye transfer inhibition, food processing, starched, sterilized, bleached in hygiene preparations oral and / or disinfection of contact lenses.

In the context of the present invention, the bleached should be understood generally related to the discoloration of stains or other materials bound or associated with a substrate However, it is envisioned that the present invention may apply when a requirement is withdrawal and / or neutralization by an oxidizing bleaching reaction of smelly or other components undesirable components bound or otherwise associated with a substratum.

Examples

Reference Example one

A stock solution of 1.5 g / l of a base powder detergent. The powder detergent contained NaLAS at 18%, 73% salts (silicate, sodium tripolyphosphate, sulfate, carbonate), 3% minor ingredients including perborate, fluorescent agent and enzymes, remaining impurities and water. The solution was divided into 4 aliquots of 200 ml. To each one they added different amounts of food red 14, and then 2 BC1 test fabrics and 4 white cotton fabrics. All fabrics they were the same size and weight, the total weight of the fabric added was of 5 g. BC1 is a conventional stained test cloth used in evaluation of dirty clothes and is a tea stain control model. BC1 fabrics can be purchased from, for example, the center for test materials, Vlaardingen, NL.

The fabrics were then stirred in solution for 20 min., they were removed, rinsed and the 2 BC1 and 2 fabrics of the white fabrics were irradiated in a wear meter (WOM) for 30 minutes A WOM produces artificial sunlight and adjusted to give 385 W / m2 in the UV-visible range. The other 2 remaining white fabrics dried in the dark in a spin dryer.

After these procedures the fabric color using a reflectance spectrometer and it expressed as the ΔE relative to the clean washed white cloth. The results are presented in the following table.

       \ vskip1.000000 \ baselineskip
    

4

       \ vskip1.000000 \ baselineskip
    

There is a clear photo-bleached BC1 stain. One is transferred Small amount of red coloration to the white cloth. This Red coloring is removed by exposure to sunlight.

Reference Example 2

A stock solution of SDS surfactant was created at 1 g / l in water. The solution was divided in two and the two halves were buffered at pH 10 and pH 8 respectively using salts Conventional (Hydrion? buffer, purchased from Sigma-Aldrich). The solution was used to wash BC1 stains as follows. A piece of 3.7 g of cloth BC1 stained cotton plus a piece of 0.7 g of cotton fabric clean white tissue was stirred in 100 ml of wash solution for 20 min., rinsed twice, then the BC1 cloth was irradiated in a WOM for thirty minutes. Then the ΔE of the fabrics relative to a clean pattern. Fabrics then they were irradiated for an additional 30 minutes and turned to measure.

The experiment was repeated using solution of wash containing different amounts of food Red 14. The Optical density (5 cm) of the wash solutions was measured at lambda (max) of the dye (527 nm).

All white fabrics were dried by centrifugation in the dark and red dye uptake will measured by measuring the ΔE of the fabrics relative to a non-pattern Dyed clean.

The results are presented in the following table:

       \ vskip1.000000 \ baselineskip
    

TABLE

5

       \ vskip1.000000 \ baselineskip
    

Photoblanking of the BC1 stain was observed from the whole solution containing food red 14. Notably this happens even at extremely low levels of the dye, 0.1 ppm, at this level the dye is barely visible in solution and red could not be discerned with the naked eye on the white cloth. However, the BC1 fabric was visibly bleached. The color red on the white cloth was removed simply by leaving it in the light natural.

       \ vskip1.000000 \ baselineskip
    

Reference Example 3

Stains on white woven cotton were created by: placing 1 drop of (a) a saturated solution of turmeric in soybean oil or (b) placing 2 drops of palm oil Brazilian.

Three of each of the types of spots (a), (b), BC1 stains and four clean white ballast pieces (weight total = 11.4 g) were washed at 40 ° C for 20 minutes in 200 ml of water containing 7 g / l of Persil Color ™ powder detergent. Persil Color ™ contains less than 5% soap. Polycarboxylate and phosphonate, 5 to 15% of anionic and non-ionic surfactants, 15-30% zeolite and also contains enzymes. After washing the fabrics were rinsed once in water, once in acid solution, and finally once more in water. Later they all irradiated in a WOM for 36 minutes. Stains residual and in relation to the clean white cloth were measured using a reflectometer and were expressed as the ΔE value. The white ballast discoloration due to matter transfer Colored stain in the wash was measured in an analogous manner.

The experiment was repeated but with the following, added to the wash solution:

(a) 1 ppm of food red 14

(b) 10 ppm of vitamin K3 (a radical photo-initiator whitening spots carotenoids)

(c) 1 ppm of food red 14 plus 10 ppm of vitamin K3

       \ newpage
    

The results are presented in the following table.

       \ vskip1.000000 \ baselineskip
    

TABLE

6

The combination of Food Red 14 with the Vitamin K3 gives good overall bleaching effects.

       \ vskip1.000000 \ baselineskip
    

Reference Example 4

A piece of 3.7 g of stained cotton fabric BC1 was washed in 80 ml of a buffered solution at pH = 10 of 0.2 g / l of SDS. The washing consisted of a 15 minute stirring followed by cleared up. The fabric was then irradiated in a WOM for 30 minutes and residual stain was measured as the? relative to cotton clean white The experiment was also performed with liquors of wash containing various xanthene type dyes. % Of deposition of the dyes on the fabric was obtained by measuring the UV-VI spectrum of wash liquors before and after washing. The results are shown in the following table.

       \ vskip1.000000 \ baselineskip
    

TABLE

7

From the results, food Red 14 and Bengali Pink provide superior bleaching.

8

       \ vskip1.000000 \ baselineskip
    

Example 5

A stock solution of 1.5 g / l of a water based powder detergent. The powder detergent contained 18% NaLAS, 73% salts (silicate, sodium tri-polyphosphate, sulfate, carbonate), 3% minor ingredients including perborate, fluorescent agent and enzymes, remaining impurities and water. The solution was divided into 60 ml aliquots and various combinations of food red dye 14 with acid blue 29 added thereto in the amount indicated in the results table. 1 piece was placed of non-fluorescent, non-mercerized woven cotton fabric, bleached (Phoenic Calico) weighing 1.3 g in the solution a room temperature (20ºC). This fabric represents a cotton slightly yellow The cloth was impregnated for 45 minutes, then the solution was stirred for 10 min., rinsed and dried in Darkness. After washing the Ganz whiteness of the web (see "Assessment of Whiteness and Tint of Fluorescent Substrates with Good Interinstrument Correlation "Color Research and Application 19, 1994). A greater value of Ganz is associated with whiter cloth. The results are the average of 2 experiments

TABLE

10

The mixture of food red 14 with Blue dyes gives an increase in the whiteness of the fabric. He acid black dye 1 gave similar results.

       \ vskip1.000000 \ baselineskip
    

Example 6

The experiment of example 5 was repeated. Except that on this occasion a piece of 3.7 g of cotton cloth was washed stained BC1 in 60 ml of solution containing various amounts of food red 14 and acid blue 29. The wash consisted of 30 stirring minutes After rinsing the fabrics are irradiated in a WOM for 30 minutes and the residual spot was measured as the ΔE relative to clean white cloth. The Results are shown in the following table.

TABLE

eleven

Therefore, the mixture of dyes gives effects photo-bleaching and tonality benefits (example 5).

Reference Example 7

A solution of 0.2 g / l of surfactant was created SDS in cap of pH = 10 (Hydrion?). The solution was divided into 2 and Bengali Rose was added to one half so that its density optical at maximum absorption of the dye in the visible outside 0.81 (5 cm). A similar solution was created for Food Red 14 but with a higher optical density of 0.93. Red's solution food 14 in outdoor lighting was much paler to simple sight that of Bengali Rosa. This was confirmed by 12 adults. independent with ages in the range of 25-60 years. Everything indicated that the solution of Bengali Rose had a color more intense, despite the fact that it had an optical density lower. This clearly shows the advantage of being able to dose Food Red 14 at a higher level without over-coloring of liquor.

Claims (14)

1. A bleaching composition that understands: a) 0.0001 to 0.1% w / w of a red dye photo-reagent that has a peak in the visible in the 500 to 550 nm range; b) from 0.0001% w / w to 0.1% w / w of a dye lambda blue max at 580-640 nm; c) from 0 to 40% w / w of other species of bleached; Y, d) balance vehicles and ingredients accessories up to 100% w / w of the bleaching composition total. 2. A bleaching composition according to claim 1, wherein the red dye Photo-reagent is a xanthene dye. 3. A bleaching composition according to claim 2, wherein the red dye photo-reagent is selected from the group that It consists of Eosin Y, Floxin B, Bengali Rose, and Food Red 14. 4. A bleaching composition according to claim 3, wherein the red dye Photo reagent is Food Red 14. 5. A bleaching composition according to any preceding claim, wherein the blue dye is select from the group consisting of: acid blue dyes and direct blue dyes. 6. A bleaching composition according to claim 5, wherein the blue dye is a dye acid blue selected from the group consisting of: acid black 1, acid blue 29, acid blue 113, and acid black 24. 7. A bleaching composition according to any preceding claim, wherein the red dye photo-reactive: blue dye is in the proportion 9: 1 to 1: 9. 8. A bleaching composition according to any preceding claim, wherein the composition of bleached comprises other photo-bleaches. 9. A bleaching composition according to claim 8, wherein the bleaching composition It comprises vitamin K3. 10. A bleaching composition according to any preceding claim, wherein the composition of bleached comprises a kind of peroxyl. 11. A bleaching composition according to claim 10, wherein the bleaching composition It comprises a bleaching activator. 12. A bleaching composition according to any one of claims 1 to 9, wherein the bleaching composition comprises a bleaching catalyst with air or ligand thereof, comprising the composition of bleached less than 1% w / w total concentration of a system bleach based on peroxy or that generates peroxyl. 13. A bleaching composition according to claim 1 to 9 and 12, wherein the composition of Bleached is a liquid bleaching composition. 14. A bleaching composition according to any preceding claim, wherein the composition of bleached comprises 5 to 40% w / w of a surfactant having an HLB greater than 15.