Classifications

• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
  • C11D3/16—Organic compounds
  • C11D3/38—Products with no well-defined composition, e.g. natural products
  • C11D3/386—Preparations containing enzymes, e.g. protease or amylase
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
  • C11D3/39—Organic or inorganic per-compounds
  • C11D3/3902—Organic or inorganic per-compounds combined with specific additives
  • C11D3/3905—Bleach activators or bleach catalysts
  • C11D3/3907—Organic compounds
  • C11D3/3915—Sulfur-containing compounds

Definitions

• the present invention relates to a detergent composition for effective stain removal.
• the invention has been developed primarily for use in detergent compositions and will be described hereinafter with reference to this application. However, it will be appreciated that the invention is not limited to this particular field of use.
• Builders are added to the detergent composition primarily to complex with Ca +2 and Mg 2+ and thereby reduce hardness of water. In addition to removing Ca 2+ and Mg 2+ ions, some builders also emulsify soil particles, reduce soil re-deposition by suspending the soil in the wash liquor and provide alkalinity which assists in dissolving oil-based soils. Use of an ineffective builder or the use of an ineffective amount of a builder lessens the cleaning performance of surfactants.
• Sodium tripolyphosphate is a phosphate type sequestering builder which, in addition to removing the dissolved ions, helps disperse and suspend soil in the wash liquor and emulsifies oily material. For this reason phosphates such as tripolyphosphates and pyrophosphates have been widely used as builders. The effect of phosphates upon the eutrophication of lakes and streams has been questioned and their use in detergent compositions has been subject to government scrutiny and regulation.
• Zeolites, used as alternative builders are ion-exchange builders which provide benefits comparable to phosphate builders but are not desirable as they are water insoluble and can foul sewer lines and water treatment facilities.
• Precipitating builders for example sodium carbonate
• Precipitating builders are environment friendly and removes Ca 2+ and Mg 2+ ions as precipitated calcium and magnesium particles.
• Use of precipitating builders may reduce the cleaning activity by deposition of precipitated calcium and magnesium particles on the fabric.
• precipitating builders have slow Ca 2+ and Mg 2+ ions removal efficiency and are ineffective at completely preventing precipitation of surfactants owing to their reaction with calcium and magnesium ions. This further reduces the cleaning efficiency of detergent composition having precipitating builders.
• Bleaches are yet another widely used ingredient in the detergent composition that removes stain.
• Peroxygen bleach compounds can bleach stains without damaging the colour of the fabrics and hence are widely used.
• To bleach stains at temperature below 60°C requires bleach activators in combination with peroxygen bleach compounds.
• stains are oxidized and broken into fragments which are later suspended in the solution by the surfactant.
• a lowered efficiency of surfactant in presence of precipitating builder may also affect the bleach efficiency. Presence of clay or soil on the fabric further reduces bleaching of hydrophobic stains.
• Detergent compositions having peroxygen bleach compound and hydrophobic bleach activator are known in the art.
• US5043089 (1991, Akzo N.V) discloses a novel p-sulphophenyl alkyl carbonates where the alkyl group contains 6 to 10 carbon atoms providing an effective bleach activator.
• This application also discloses a detergent composition having the bleach activator, a bleaching agent and a surfactant.
• This application does not disclose a detergent composition having non-phosphate builders for providing effective stain removal.
• GB2395488A discloses a process of removing coloured stains from hydrophobic surfaces by treating with a formulation having a salt of sulphophenyl alkyl carbonate.
• the formulation may additionally include an oxygen source, a builder, a surfactant and preferably encapsulated enzyme.
• This application discloses detergent compositions having phosphate builders.
• a detergent composition having a combination of specific bleach activator, a non-phosphate precipitating builder and an enzyme provides for effective removal of stains particularly the tough hydrophobic stains.
• the present invention provides a detergent composition comprising:
• the present invention provides for a method of bleaching a bleachable substrate comprising the steps of:
• the third aspect disclosed is a use of the detergent composition of the first aspect for bleaching tough hydrophobic stains.
• the invention provides a detergent composition having a precipitating builder, a surfactant, a bleach activator and an enzyme.
• Builders used in the detergent composition may be classified in various ways.
• One method of classification of detergent builders is based on their mode of action and includes classification into sequestering, precipitating and ion-exchange builders.
• Another conventional method of classification of detergent builders is to classify them as inorganic and organic detergent builders.
• Yet another method of classification is based on their solubility in water and is accordingly classified as water soluble or water insoluble builders.
• Disclosed detergent composition includes a precipitating builder.
• precipitating builders In contact with the ions Ca 2+ and Mg 2+ generally present in the wash liquor precipitating builders precipitate out as a complex with the water hardness cations (Ca 2+ and Mg 2+ ), thereby performing a builder function.
• Specific examples of precipitating builders include sodium fatty acid sulphonate, long chain fatty acid soaps, water-soluble salts of carbonates, bicarbonates, sesquicarbonates, silicates, aluminates and oxalates. Alkali metal salts, especially sodium salts of the foregoing materials are preferred for convenience and economy.
• the precipitating builder is a water-soluble carbonate salt. It is highly preferred that the precipitating builder is sodium carbonate.
• the precipitating builder of the present invention is a non-phosphate precipitating builder.
• the precipitating builder is present from 5 wt% to 80 wt% in the composition, more preferably from 10 wt% to 60 wt%, still more preferably from 12 wt% to 30 wt% and most preferably from 15 wt% to 25 wt%.
• a crystallization seed may be used in the detergent composition along with the precipitating builder; such crystallization seed quickens the rate of precipitation of the metal cations, and thereby removes the hardness before it can adversely affect detergency performance.
• Disclosed detergent composition includes 0 to 5 wt% of a zeolites or a phosphate sequestering builder or mixtures thereof.
• Disclosed detergent composition includes 0 to 5 wt% of zeolites. It is preferred that the detergent composition of the present invention not more than 4wt%, further preferably not more than 2wt% of zeolites and highly preferred composition is free of the zeolite builders.
• Zeolites are ion-exchange builders and are substantially water insoluble builders which are capable of reducing the hardness content of laundering liquors.
• Ion-exchange builder may be crystalline or amorphous aluminosilicates.
• Aluminosilicates can be naturally occurring aluminosilicates or synthetically derived.
• Preferred synthetic crystalline aluminosilicate ion-exchange materials useful herein are available under the designations Zeolite A, Zeolite B, Zeolite X, Zeolite HS and mixtures thereof.
• the crystalline aluminosilicate ion-exchange material is Zeolite A.
• Zeolite MAP is described in EP 384070A (Unilever). It is defined as an alkali metal alumina-silicate of the zeolite P type having a silicon to aluminium ratio not greater than 1.33, preferably not greater than 1.15 and, more particularly, not greater than 1.07 and preferably within the range of from 0.9 to 1.2.
• Disclosed detergent composition includes 0 to 5 wt% of a phosphate sequestering builder. It is preferred that the detergent composition of the present invention includes not more than 4wt%, further preferably not more than 2wt% of the phosphate sequestering builders and highly preferred composition is free of the phosphate sequestering builders.
• Sequestering builders are water soluble builder that forms water soluble complexes with Ca 2+ and Mg 2+ ions.
• Phosphate sequestering builders include orthophosphates, tripolyphosphate, alkali metal pyrophosphates and organic phosphonates.
• Examples of the phosphate sequestering builders include sodium tripolyphosphate, tetrasodium pyrophosphate, hexametaphosphate, and tetrapotassium pyrophosphate.
• organic phosphonates includes the sodium and potassium salts of ethylene diphosphonic acid, the sodium and potassium salts of ethane 1-hydroxy-1,1 diphosphonic acid, and the sodium and potassium salts of ethane-1,1,2-triphosphonic acid.
• non-phosphate sequestering builders that may be present in the detergent composition of the present invention for use as builders includes hydrocarboxylates (citrates, tartrates, succinates, gluconates), polycarboxylates, aminocarboxylates (ethylenediaminetetraacetate(EDTA), and nitrilotriacetate (NTA)) diethylene triamine pentaacetic acid (DTPA), hydroxyethylene diamine triacetic acid (HEDTA), dihydroxyethyl glycine (DEG), and triethanolamine.
• hydrocarboxylates cetrates, tartrates, succinates, gluconates
• polycarboxylates aminocarboxylates
• EDTA ethylenediaminetetraacetate
• NDA nitrilotriacetate
• DTPA diethylene triamine pentaacetic acid
• HEDTA hydroxyethylene diamine triacetic acid
• DEG dihydroxyethyl glycine
• Disclosed detergent composition includes 2 to 80 wt% surfactant. It is preferred that the detergent composition includes atleast 10 wt% surfactant more preferably at least 20wt% and still more preferably atleast 30wt% of the surfactant. It is preferred that the disclosed detergent composition includes not more than 70wt%, preferably not more than 60wt% and more preferably not more than 50wt% and still preferably not more than 40wt% of the surfactant.
• Disclosed cleaning composition preferably includes a surfactant.
• the surfactant may be a soap or an anionic, nonionic, amphoteric, zwitterionic or cationic surfactant or mixtures thereof.
• the nonionic and anionic surfactant may be chosen from the surfactants described in " Surface Active Agents” Vol. 1, by Schwartz and Perry, Interscience 1949 , Vol. 2 by Schwartz, Perry and 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.
• anionic surfactant include sodium and potassium alkyl C 9 to C 20 benzene sulphonates, particularly sodium linear secondary alkyl C 10 to C 15 benzene sulphonates; and sodium alkyl glyceryl ether sulphates, especially those ethers of the higher alcohols derived from tallow or coconut oil and synthetic alcohols derived from petroleum.
• anionic surfactants are sodium lauryl ether sulfate (SLES), particularly preferred are anionic surfactant with 1 to 3 ethoxy groups, sodium C 10 to C 15 alkyl benzene sulphonates (LAS) and sodium C 12 to C 18 alkyl sulphates (PAS).
• Alkyl ester suphonates such as methyl ester sulphonates (MES) may be preferably used for replacing a portion or completely replacing the anionic surfactant.
• Suitable surfactants are those described in EP-A-328 177 (Unilever), which shows resistance to salting-out, the alkyl polyglycoside surfactants described in EP-A-070 074 and alkyl monoglycosides.
• the surfactant chain may be branched or linear.
• Suitable nonionic surfactants include the reaction products of compounds having a hydrophobic group and a reactive hydrogen atom, for example, aliphatic alcohols, acids, amides or alkyl phenols with alkylene oxides, especially ethylene oxide either alone or with propylene oxide.
• Preferred nonionic surfactants are C 6 to C 22 alkyl phenol-ethylene oxide condensates, generally having 5 to 25 EO, i.e.
• the condensation products of aliphatic C 8 to C 18 primary or secondary linear or branched alcohols with ethylene oxide generally 5 to 50 EO.
• the non-ionic is 10 to 50 EO, more preferably 20 to 35 EO.
• Alkyl ethoxylates are particularly preferred.
• the fatty acid soap used preferably contains from about 16 to about 22 carbon atoms, preferably in a straight chain configuration.
• Preferred soap may be derived from saturated and non-saturated fatty acids obtained from natural sources and synthetically prepared. Examples of such fatty acids include capric, lauric, myristic, palmitic, stearic, oleic, linoleic and linolenic acid.
• the anionic contribution from soap is preferably from 0 to 30 wt% of the total anionic.
• Preferred surfactant systems are mixtures of anionic with nonionic surfactant, in particular the groups and examples of anionic and nonionic surfactants pointed out in EP-A-346 995 (Unilever).
• amphoteric or zwitterionic surfactants can also be used in the compositions of the invention but this is not normally desired owing to their relatively high cost. If any amphoteric or zwitterionic surfactants are used, it is generally in small amounts in combinations with anionic and nonionic surfactants.
• Disclosed detergent composition includes a mixture of protease, lipase, amylase and mannanase enzymes.
• Disclosed detergent composition includes a protease.
• Suitable protease includes those of animal, vegetable or microbial origin. Protease from microbial origin is preferred. Protease may also be chemically modified or protein engineered mutant.
• the protease is a serine protease or a metallo protease, preferably an alkaline microbial protease or a trypsin-like protease.
• alkaline proteases are subtilisins, especially those derived from Bacillus, examples include subtilisin Novo, subtilisin Carlsberg, subtilisin 309, subtilisin147 and subtilisin 168 (described WO8906279A1 )
• subtilisin-like proteases are trypsin from porcine or bovine origin and the Fusarium protease described in WO8906270A1 and WO9425583A1 .
• the protease is preferably from B.subtilis.
• Preferred commercially available protease includes AlcalaseTM, SavinaseTM, PrimaseTM, DuralaseTM, DyrazymTM, EsperaseTM, EverlaseTM, PolarzymeTM, and KannaseTM, MaxataseTM, MaxacalTM, MaxapemTM, ProperaseTM, Purfast®, Effectenz®, PurafectTM, Purafect OxPTM, FN2TM, and FN3TM (Genencor International Inc.).
• Protease from a strain of Bacillus having maximum activity throughout the pH range of 8 to 12 is highly preferred and includes commercially available EsperaseTM and SavinaseTM.
• the detergent composition of the present invention include 0.001 wt% to 10 wt% more preferably from 0.01 wt% to wt% of protease depending upon their activity.
• Disclosed detergent composition includes a lipase.
• Lipase catalyses hydrolysis of ester bonds of edible fats and oils, i.e. triglycerides, into free fatty acids, mono- and diglycerides and glycerol.
• Preferred lipases include those of bacterial or fungal origin. Chemically modified or protein engineered mutants are included. Examples of useful lipases include lipases from Humicola species (incl. Thermomyces. species) which includes lipase from H. lanuginosus (T. lanuginosus) as described in EP0258068B1 and EP0305216B1 or from H. insolens as described in WO9613580A1 or lipases from Pseudomonas species which includes lipase from P. alcaligenes or P. pseudoalcaligenes ( EP0218272 A1 ), P. cepacia ( EP0331376B1 ), P.
• lipase variants such as those described in WO92/05249 , WO94/01541 , EP407225 , EP260105 , WO96/35381 , WO96/00292 , WO95/30744 , WO94/25578 , WO95/14783 , WO95/22695 , WO97/04079 and WO97/07202 .
• Preferred commercially available lipases are available under the trademarks Lipoclean®, Lipolase®, Lipolase® Ultra and Lipex®. LIPEX® is particularly preferred, and LIPEX® 100 T is further particularly preferred.
• the activity of commercial lipase is commonly expressed as Lipase Units or LU. Different lipase preparations may have different activities. For fungal lipases these may range from 2,000 to 2,000,000 LU per gram.
• Preferred compositions include lipase having 5 to 20000LU/g.
• lipases In order to prevent accidents and to alleviate safety concerns, commercial lipases are always coated with an inert material. Therefore, commercial lipases that are used for detergent powders, bars and tablets are in granular form containing very low amount of active lipase and balance of adjunct materials. Such granulates contain lipase concentrate, inorganic salt, binders and coating materials. They are free-flowing so that there is no lumping, and the granulate dissolve faster. Lipases are also available in liquid form, example LIPEX ® 100 L.
• Preferred detergent composition has 0.0001wt% to 0.3wt% lipase, more preferably from 0.0001 to 0.1wt% lipase and further preferably 0.0009wt% to 0.00186 wt% lipase.
• Disclosed detergent composition includes an amylase.
• Suitable amylases include those of bacterial or fungal origin. Chemically modified or protein engineered mutants are included. Examples of amylase suitable for the present invention includes alpha-amylase obtained from Bacillus species which includes special strain of B. licheniformis, described in more detail in GB 1,296,839 , or the Bacillus species strains disclosed in WO 95/026397 or WO 00/060060 .
• amylases are the variants described in WO 94/02597 , WO 94/18314 , WO 96/23873 , WO 97/43424 , WO 01/066712 , WO 02/010355 and WO 02/031124 (which references all incorporated by reference).
• amylases are Duramyl(TM), Termamyl(TM), Termamyl Ultra(TM), Natalase(TM), Stainzyme(TM), Stainzyme Plus(TM), Fungamyl(TM) and BAN(TM) (Novozymes A/S), Rapidase(TM) and Purastar(TM) (from Genencor International Inc.).
• composition includes mannanase.
• suitable mannanase include those of bacterial or fungal origin.
• the mannanase is derived from a strain of a filamentous fungus genus Aspergillus, preferably Aspergillus niger or Aspergillus aculeatus ( WO 94/25576 ).
• WO 93/24622 disclosing a mannanase isolated from Trichoderma reese is also preferred.
• Mannanases have also been isolated from several bacteria, including Bacillus species. For example, Talbot et al.,Appl. Environ. Microbiol., Vol.56, No. 11, pp.
• JP-A-03047076 discloses a beta-mannanase derived from Bacillus sp.
• JP-A-63056289 describes the production of an alkaline, thermostable beta- mannanase.
• JP-A-63036775 relates to the Bacillus microorganism FERM P-8856 which produces beta-mannanase and beta-mannosidase.
• JP-A-08051975 discloses alkaline beta-mannanases from alkalophilic Bacillus sp. AM-001.
• a purified mannanase from Bacillus amyloliquefaciens is disclosed in WO 97/11164 .
• mannanases examples include Mannaway(TM) available from Novozymes A/S Denmark.
• Disclosed detergent composition includes a bleach activator of the general formula and where R is an alkyl group with 6 to 10 carbon atoms and M + is a cation.
• R is an alkyl group with 6 to 10 carbon atoms and M + is a cation.
• the alkyl group R is selected from n-hexyl, n-octyl or 2-ethylhexyl.
• the cation M + is sodium or potassium. It is highly preferred that the bleach activator is sodium 4-sulphophenyl 2-ethylhexyl carbonate.
• the bleach activator may be in the form of a powder or as particulate bodies having the bleach activator, a binder or agglomerating agent. It is preferred for reasons of stability and handling that the bleach activator is in the form of particulate bodies.
• Disclosed composition preferably includes a peroxygen bleach compound capable of yielding hydrogen peroxide in aqueous solution.
• Hydrogen peroxide sources are well known in the art. Hydrogen peroxide sources are described in details in Kirk Othmer's Encyclopedia of Chemical Technology, 4th Ed (1992, John Wiley & Sons), Vol. 4, pp. 271-300 "Bleaching Agents (Survey)", and include the alkali metal salts of sodium perborates and sodium percarbonates, including various coated and modified forms.
• Suitable peroxygen bleach compounds include hydrogen peroxide or any of its solid adducts such as organic peroxides example; urea peroxide and inorganic persalts such as the alkali metal perborates, percarbonates, perphosphates, persilicates and persulphates. Mixtures of two or more such compounds may also be suitable.
• Preferred inorganic persalts are sodium perborate monohydrate and tetrahydrate, and sodium percarbonate.
• Percarbonate is stable during storage and dissolves quickly in the cleaning liquor and is especially preferred. It is believed that such rapid dissolution results in the formation of higher levels of percarboxylic acid and, thus, enhances substrate bleaching performance.
• Highly preferred percarbonate is in uncoated or coated form.
• the average particle size of uncoated and coated percarbonate ranges from about 400 to about 1200 ⁇ m, most preferably from about 400 to about 600 ⁇ m.
• the preferred coating materials include mixtures of carbonate and sulphate, zeolite, precipitated silica, waxes, borates, polymers, citrates, silicate, borosilicate or fatty acids.
• the disclosed detergent composition has 4 to 35 wt% of the peroxygen bleach compound more preferably 5 to 20 wt % and further preferably 10 to 15 wt% of the peroxygen bleach compound.
• the disclosed detergent composition is a granular detergent composition.
• the granular detergent composition is of a low to moderate bulk density.
• Preferred granular detergent composition may be made of any known methods for manufacturing a granular detergent composition that includes spray-drying, drum drying, fluid bed drying, and scraped film drying preferably using the wiped film evaporator.
• the granular detergent composition may be in a 'concentrated' or 'compact' form.
• Such detergent composition may be prepared by mixing and granulating process, for example, using a high-speed mixer or granulator, or other non-tower process.
• the pH of the aqueous solution on dissolution of the detergent composition is 6 to 12 and more preferably from 7 to 10.5.
• Disclosed detergent composition may include one or more of other ingredients selected from bleach stabilizer, polymers, perfumes, fluorescers, soil release polymers, germicides, colourants and coloured speckles. This list is not intended to be exhaustive.
• composition may include a bleach stabiliser.
• bleach stabilisers include ethylenediamine tetraacetate (EDTA), ethylenediamine disuccinate (EDDS), and the aminopolyphosphonates such as ethylenediamine tetramethylene phosphonate (EDTMP) and diethylenetriamine pentamethylene phosphonate (DETPMP).
• the composition may include one or more polymers.
• polymers include carboxymethylcellulose, poly (ethylene glycol), poly (vinyl alcohol), polycarboxylates such as polyacrylates, maleic/acrylic acid copolymers and lauryl methacrylate/acrylic acid copolymers.
• Suitable commercially available polymer includes Sokalan CP5 (ex BASF) which is a polyacrylate, namely maleic acid-acrylic acid copolymer, with a sodium salt.
• Disclosed detergent composition may also include perfumes.
• the perfumes could be of natural origin or synthetic. They include single compounds or mixtures of compounds.
• perfume in this context is not only meant a fully formulated product delivering fragrance, but includes selected components of that fragrance, particularly those which are prone to loss, such as the so-called top notes.
• perfume may be used in the form of neat oil or in an encapsulated form.
• composition may also include fluorescent agent (optical brightener).
• Fluorescent agents are well known and many such fluorescent agents are available commercially. Usually, these fluorescent agents are supplied and used in the form of their alkali metal salts, for example, the sodium salts.
• the total amount of the fluorescent agent or agents used in the composition is generally from 0.005 to 2 wt%, more preferably 0.01 to 0.1 wt%.
• Preferred fluorescent agent includes but not limited to di-styryl biphenyl compounds, e.g. Tinopal (Trade Mark) CBS-X, diamine stilbene disulphonic acid compounds, e.g. Tinopal DMS pure Xtra and Blankophor (Trade Mark) HRH and pyrazoline compounds, e.g. Blankophor SN.
• Preferred fluorescers are: sodium 2- (4-styryl-3-sulfophenyl) -2H-napthol [1,2-d]triazole, disodium 4, 4'-bis ⁇ [(4-anilino-6- (N methyl-N-2 hydroxyethyl) amino 1,3,5-triazin-2-yl)]amino ⁇ stilbene-2-2' disulfonate and disodium 4,4'- bis (2-sulfoslyryl) biphenyl.
• Tinopal® DMS is the disodium salt of disodium 4,4'-bis ⁇ [(4-anilino-6-morpholino-1 ,3,5-triazin-2-yl)]amino ⁇ stilbene-2-2' disulfonate.
• Tinopal® CBS is the disodium salt of disodium 4,4'-bis(2-sulfostyryl)biphenyl.
• disclosed invention provides a method of bleaching a bleachable substrate comprising the steps of applying to the substrate a neat or diluted form of the composition as according to the first aspect; and rinsing the substrate.
• SRI 100 ⁇ ⁇ E * aw
• a SRI of 100 means complete removal of a stain. The higher the SRI value, the greater is the stain removal potential.
• the clean (or virgin) fabric is an "absolute standard". For each experiment, it refers to an identical piece of fabric to that to which the stain is applied. Therefore, its point in L a b colour space stays constant.
• Control A control detergent composition (Control) was formulated with sodium carbonate as the precipitating builder and 2.6% zeolite 4A.
• the control composition had no bleach, no bleach activator and no enzyme.
• Other standard laundry detergents were included.
• the composition of Control is provided in Table 1.
• a first comparative detergent composition (Comp A) was formulated by adding sodium 4-sulphophenyl 2-ethylhexyl carbonate (bleach activator according to the invention) and sodium percarbonate (bleach) to the control composition.
• the first comparative detergent composition had no enzyme.
• a second comparative detergent composition (Comp B) was formulated by adding enzymes protease, lipase, amylase and mannanase to the control composition.
• the second comparative detergent composition had no sodium 4-sulphophenyl 2-ethylhexyl carbonate (bleach activator) and sodium percarbonate (bleach).
• a preferred detergent composition (Ex 1) was formulated by addition of sodium 4-sulphophenyl 2-ethylhexyl carbonate (bleach activator according to the present invention), sodium percarbonate (bleach) and enzymes protease, lipase, amylase and mannanase to the control composition.
• Control The formulations of control, comparative compositions (Comp A, Comp B) and preferred composition (Ex 1) is provided in Table 1.
• Said machine wash protocol is as follows:
• a delta SRI value higher than the LSD (Least significant difference) value indicates a statistically significant difference between the absolute SRI values of stained swatch washed with the preferred composition or comparative composition and the absolute SRI value of stained swatch washed with control composition.

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