Method of laundrying a fabric

Abstract

The present invention relates to a method of washing a fabric. The method subjects the fabric to be washed to an acidic washing step. After the acid washing step, the fabric is removed from the acid washing bath and subjected to a total abrasive force of 1.5 kg to 10 kg. The fabric is then rinsed with water.

Description

Technical Field

[0001] The present invention relates to a method for washing fabrics. The method subjects the fabrics to be washed to an acid washing step. After the acid washing step, the fabrics are removed from the acid washing bath and subjected to a specific total abrasive force. The fabrics are then rinsed in water. Background Art

[0002] Detergent manufacturers seek to provide products with good cleaning performance as well as good fabric care performance. Lowering the pH profile of a product is one way that detergent manufacturers can improve the fabric care performance of a product. A typical solid laundry detergent product has a pH of about 10.5, and lowering the pH profile to a pH of 2-3 can significantly improve fabric care characteristics. However, lowering the pH profile to such an acidity can significantly deviate from the cleaning characteristics of the product, especially the removal of complex colored soils such as underarm soils.

[0003] The present invention seeks to provide a method for washing fabrics which provides good fabric care performance and good cleaning performance, especially for the removal of complex colored soils. The present invention provides a method which comprises subjecting the soiled fabrics to an acid soak at a controlled dose and volume and at a very low pH, followed by removing the soiled fabrics from the soak and subjecting the fabrics to a specific total abrasive force, followed by a rinsing step.

[0004] The process of the present invention provides good fabric care as well as good fabric cleaning of difficult colored soils. Summary of the invention

[0005] The present invention provides a method for washing fabrics, wherein the method comprises the following steps:

[0006] (a) contacting 10 g to 100 g of an acidic solid laundry detergent composition with 1.01 L to 10.0 L of water to form an acidic aqueous wash bath having a pH in the range of 2.0 to 3.0,

[0007] wherein the acidic solid laundry detergent composition comprises 10 wt % to 70 wt % of an acidic component and 1.0 wt % to 20 wt % of a detersive surfactant;

[0008] (b) contacting a soiled fabric with said acidic aqueous washing bath and washing said soiled fabric in said acidic aqueous washing bath for a period of 20 minutes to 24 hours,

[0009] (c) removing the washed fabric from the acidic aqueous washing bath;

[0010] (d) subjecting the soiled fabric from step (c) to a total abrasive force of from 1.5 kg to 10 kg; and

[0011] (e) rinsing the washed fabric with water. DETAILED DESCRIPTION

[0012] Methods of washing fabrics

[0013] The method comprises the following steps:

[0014] (a) contacting 10 g to 100 g of an acidic solid laundry detergent composition with 1.01 L to 10.0 L of water to form an acidic aqueous wash bath having a pH in the range of 2.0 to 3.0,

[0015] wherein the acidic solid laundry detergent composition comprises 10 wt % to 70 wt % of an acidic component and 1.0 wt % to 20 wt % of a detersive surfactant;

[0016] (b) contacting a soiled fabric with said acidic aqueous washing bath and washing said soiled fabric in said acidic aqueous washing bath for a period of 20 minutes to 24 hours,

[0017] (c) removing the washed fabric from the acidic aqueous washing bath;

[0018] (d) subjecting the soiled fabric from step (c) to a total abrasive force of from 1.5 kg to 10 kg; and

[0019] (e) rinsing the washed fabric with water.

[0020] Step (a): Forming an Acidic Aqueous Washing Bath

[0021] Step (a) 10g to 100g of an acidic solid laundry detergent composition is contacted with 1.01L to 10.0L of water to form an acidic aqueous washing bath having a pH in the range of 2.0 to 3.0. The acidic solid laundry detergent composition comprises 10wt% to 70wt% of an acidic component and 1.0wt% to 20wt% of a detersive surfactant.

[0022] Step (b): Acidic washing step

[0023] Step (b) brings the soiled fabric into contact with the acidic aqueous washing bath, and washes the soiled fabric in the acidic aqueous washing bath for 20 minutes to 24 hours.

[0024] Preferably, during step (b), the soiled fabric is washed in the acidic aqueous washing bath for a period of 30 minutes to 3 hours.

[0025] Preferably, step (b) is carried out at an acidic aqueous wash bath temperature of 5°C to 25°C.

[0026] Step (c): Taking out the washed fabric

[0027] Step (c) removing the washed fabric from the acidic aqueous washing bath.

[0028] Step (d): Grinding step

[0029] Step (d) subjects the soiled fabric from step (c) to a total abrasive force of from 1.5 kg to 10 kg.

[0030] Preferably, during step (d) the soiled fabric is subjected to a total abrasive force of from 2.0 kg to 6.0 kg.

[0031] Step (e): Rinse the washed fabric

[0032] Step (e) rinses the washed fabric with water.

[0033] Acidic solid laundry detergent composition

[0034] The acidic solid laundry detergent composition comprises 10 to 70 wt % of an acidic component and 1.0 to 20 wt % of a detersive surfactant.

[0035] Preferably, the acidic solid laundry detergent composition comprises 30 to 70 wt% of an acidic component and 3.0 to 10 wt% of a detersive surfactant.

[0036] Acidic components

[0037] Any suitable acidic component may be used.

[0038] Suitable acidic components are polycarboxylic acids.

[0039] The preferred acidic component is citric acid.

[0040] Detergent surfactant

[0041] Any suitable detersive surfactant may be used.

[0042] Suitable detersive surfactants are selected from the group consisting of alkylbenzene sulfonates, alkyl sulfates, alkoxylated alkyl sulfates, alkoxylated alcohols, and any combination thereof.

[0043] Suitable detersive surfactants include anionic detersive surfactants, nonionic detersive surfactants, cationic detersive surfactants, zwitterionic detersive surfactants and amphoteric detersive surfactants. Suitable detersive surfactants may be linear or branched, substituted or unsubstituted, and may be derived from petrochemical materials or biomaterials.

[0044] Anionic detersive surfactants: Suitable anionic detersive surfactants include sulfonate detersive surfactants and sulfate detersive surfactants.

[0045] Suitable sulfonate detersive surfactants include methyl sulfonate, alpha olefin sulfonates, alkyl benzene sulfonates, especially alkyl benzene sulfonates, preferably C 10-13 Alkylbenzene sulfonates. Suitable alkylbenzene sulfonates (LAS) are available, preferably by sulfonating commercially available linear alkylbenzenes (LABs); suitable LABs include lower 2-phenyl LABs, other suitable LABs include higher 2-phenyl LABs, such as those sold under the trade name Those supplied by Sasol.

[0046] Suitable sulfate detersive surfactants include alkyl sulfates, preferably C 8-18 Alkyl sulfates, or mainly C 12 Alkyl sulfate.

[0047] Preferred sulfate detersive surfactants are alkyl alkoxylated sulfates, preferably alkyl ethoxylated sulfates, preferably C 8-18 Alkyl alkoxylated sulfate, preferably C 8-18 Alkyl ethoxylated sulfates, preferably alkyl alkoxylated sulfates, have an average degree of alkoxylation of 0.5 to 20, preferably 0.5 to 10, preferably alkyl alkoxylated sulfates are C 8-18 Alkyl ethoxylated sulfates having an average degree of ethoxylation of from 0.5 to 10, preferably from 0.5 to 5, more preferably from 0.5 to 3, and most preferably from 0.5 to 1.5.

[0048] The alkyl sulfates, alkyl alkoxylated sulfates, and alkyl benzene sulfonates may be linear or branched, substituted or unsubstituted, and may be derived from petrochemical or biomaterials.

[0049] Other suitable anionic detersive surfactants include the alkyl ether carboxylates.

[0050] Suitable anionic detersive surfactants may be in the form of salts, and suitable counterions include sodium, calcium, magnesium, amino alcohols, and any combination thereof. The preferred counterion is sodium.

[0051] Nonionic detersive surfactant: Suitable nonionic detersive surfactants are selected from the group consisting of: C8-C 18 Alkyl ethoxylates, such as those available from Shell Nonionic surfactant; C6-C 12 Alkylphenol alkoxylates, wherein the alkoxylate units are preferably ethyleneoxy units, propyleneoxy units, or mixtures thereof; C 12 -C18 Alcohol and C6-C 12 Condensates of alkylphenols with ethylene oxide / propylene oxide block polymers, such as those available from BASF Alkyl polysaccharides, preferably alkyl polyglycosides; methyl ester ethoxylates; polyhydroxy fatty acid amides; ether-terminated poly(alkoxylated) alcohol surfactants; and mixtures thereof.

[0052] Suitable nonionic detersive surfactants are alkyl polyglucosides and / or alkyl alkoxylated alcohols.

[0053] Suitable nonionic detersive surfactants include alkyl alkoxylated alcohols, preferably C 8-18 Alkyl alkoxylated alcohol, preferably C 8-18 The alkyl ethoxylated alcohol, preferably the alkyl alkoxylated alcohol, has an average degree of alkoxylation of 1 to 50, preferably 1 to 30, or 1 to 20, or 1 to 10, preferably the alkyl alkoxylated alcohol is C 8-18 Alkyl ethoxylated alcohols having an average degree of ethoxylation of 1 to 10, preferably 1 to 7, more preferably 1 to 5, and most preferably 3 to 7. The alkyl alkoxylated alcohols may be linear or branched, and substituted or unsubstituted.

[0054] Suitable nonionic detersive surfactants include those based on secondary alcohols.

[0055] Cationic detersive surfactants: Suitable cationic detersive surfactants include alkyl pyridinium compounds, alkyl quaternary ammonium compounds, alkyl quaternary phosphonium compounds, alkyl ternary sulfonium compounds, and mixtures thereof.

[0056] Preferred cationic detersive surfactants are quaternary ammonium compounds having the general formula:

[0057] (R)(R1)(R2)(R3)N + X -

[0058] Wherein R is a linear or branched, substituted or unsubstituted C 6-18 Alkyl or alkenyl moiety, R1 and R2 are independently selected from methyl or ethyl moieties, R3 is a hydroxyl, hydroxymethyl or hydroxyethyl moiety, and X is an anion providing electrical neutrality, and preferred anions include: halide ions, preferably chloride ions; sulfate; and sulfonate.

[0059] Zwitterionic detersive surfactants: Suitable zwitterionic detersive surfactants include amine oxides and / or betaines.

[0060] Polymers: Suitable polymers include carboxylate polymers, soil release polymers, anti-redeposition polymers, cellulosic polymers, conditioning polymers, and any combination thereof.

[0061] Carboxylate polymer: The composition may comprise a carboxylate polymer such as a maleate / acrylate random copolymer or a polyacrylate homopolymer. Suitable carboxylate polymers include: polyacrylate homopolymers having a molecular weight of 4,000 to 9,000 Da; maleate / acrylate random copolymers having a molecular weight of 50,000 to 100,000 Da, or 60,000 to 80,000 Da.

[0062] Another suitable carboxylate polymer is a copolymer comprising: (i) 50 wt% to less than 98 wt% of structural units derived from one or more monomers containing carboxyl groups; (ii) 1 wt% to less than 49 wt% of structural units derived from one or more monomers containing sulfonate moieties; and (iii) 1 wt% to 49 wt% of structural units derived from one or more types of monomers selected from monomers containing ether bonds represented by formula (I) and (II):

[0063] Formula (I):

[0064]

[0065] Wherein in formula (I), R0 represents a hydrogen atom or a CH3 group, R represents a CH2 group, a CH2CH2 group or a single bond, and X represents a number from 0 to 5, provided that when R is a single bond, X represents a number from 1 to 5, and R1 is a hydrogen atom or a C1 to C 20 Organic groups;

[0066] Formula (II)

[0067]

[0068] In formula (II), R0 represents a hydrogen atom or a CH3 group, R represents a CH2 group, a CH2CH2 group or a single bond, X represents a number from 0 to 5, and R1 is a hydrogen atom or a C1 to C 20 Organic group.

[0069] It may be preferred that the polymer has a weight average molecular weight of at least 50 kDa or even at least 70 kDa.

[0070] Soil release polymer: The composition may comprise a soil release polymer. Suitable soil release polymers have a structure as defined by one of the following structures (I), (II) or (III):

[0071] (I)-[(OCHR 1 -CHR 2 ) a -O-OC-Ar-CO-] d

[0072] (II)-[(OCHR 3 -CHR 4 ) b -O-OC-sAr-CO-] e

[0073] (III)-[(OCHR 5 -CHR 6 ) c -OR 7 ] f

[0074] in:

[0075] a, b and c are 1 to 200;

[0076] d, e and f are 1 to 50;

[0077] Ar is 1,4-substituted phenylene;

[0078] sAr is 1,3-substituted phenylene substituted at position 5 with SO3Me;

[0079] Me is Li, K, Mg / 2, Ca / 2, Al / 3, ammonium, monoalkylammonium, dialkylammonium, trialkylammonium or tetraalkylammonium, wherein the alkyl group is C1-C 18 Alkyl or C2-C 10 Hydroxyalkyl or mixtures thereof;

[0080] R 1 , R 2 , R 3 , R 4 , R 5 and R 6 Independently selected from H or C1-C 18 n-alkyl or C1-C 18 isoalkyl; and

[0081] R 7 A straight or branched C1-C 18 Alkyl, or straight or branched C2-C 30 alkenyl, or a cycloalkyl group having 5 to 9 carbon atoms, or a C8-C 30 Aryl group, or C6-C 30 Arylalkyl group.

[0082] Suitable soil release polymers are available from Clariant as A series of polymers are sold, e.g. SRN240 and SRA300. Other suitable soil release polymers are available from Solvay as A series of polymers are sold, e.g. SF2 and Crystal.

[0083] Anti-redeposition polymers: Suitable anti-redeposition polymers include polyethylene glycol polymers and / or polyethylene imine polymers.

[0084] Suitable polyethylene glycol polymers include random graft copolymers comprising: (i) a hydrophilic backbone comprising polyethylene glycol; and (ii) one or more hydrophobic side chains selected from the group consisting of: C4-C 25 Alkyl groups, polypropylene, polybutylene, vinyl esters of saturated C1-C6 monocarboxylic acids, C1-C6 alkyl esters of acrylic or methacrylic acid, and mixtures thereof. Suitable polyethylene glycol polymers have a polyethylene glycol backbone having randomly grafted polyvinyl acetate side chains. The average molecular weight of the polyethylene glycol backbone may be in the range of 2,000Da to 20,000Da, or 4,000Da to 8,000Da. The molecular weight ratio of the polyethylene glycol backbone to the polyvinyl acetate side chains may be in the range of 1:1 to 1:5, or 1:1.2 to 1:2. The average number of grafting sites per ethylene oxide unit may be less than 0.02, or less than 0.016, the average number of grafting sites per ethylene oxide unit may be in the range of 0.010 to 0.018, or the average number of grafting sites per ethylene oxide unit may be less than 0.010, or in the range of 0.004 to 0.008.

[0085] Suitable polyethylene glycol polymers are described in WO08 / 007320.

[0086] A suitable polyethylene glycol polymer is Sokalan HP22.

[0087] Cellulosic polymer: Suitable cellulosic polymers are selected from alkyl cellulose, alkyl alkoxyalkyl cellulose, carboxyalkyl cellulose, alkyl carboxyalkyl cellulose, sulfonate alkyl cellulose, more preferably selected from carboxymethyl cellulose, methyl cellulose, methyl hydroxyethyl cellulose, methyl carboxymethyl cellulose and mixtures thereof.

[0088] Suitable carboxymethyl celluloses have a degree of carboxymethyl substitution of 0.5 to 0.9 and a molecular weight of 100,000 Da to 300,000 Da.

[0089] Suitable carboxymethyl celluloses have a degree of substitution greater than 0.65 and a degree of blockiness greater than 0.45, for example as described in WO 09 / 154933.

[0090] Care polymers: Suitable care polymers include cationically modified or hydrophobically modified cellulosic polymers. Such modified cellulosic polymers can provide anti-abrasion benefits and dye lock benefits to fabrics during the wash cycle. Suitable cellulosic polymers include cationically modified hydroxyethyl cellulose.

[0091] Other suitable care polymers include dye lock polymers, for example condensation oligomers produced by condensation of imidazole and epichlorohydrin, preferably in a 1:4:1 ratio. Suitable commercially available dye lock polymers are FDI (Cognis).

[0092] Other suitable care polymers include amino-silicones, which can provide fabric feel benefits and fabric formation retention benefits.

[0093] Bleaching agents: Suitable bleaching agents include a hydrogen peroxide source, a bleach activator, a bleach catalyst, a preformed peracid, and any combination thereof. Particularly suitable bleaching agents include a hydrogen peroxide source in combination with a bleach activator and / or a bleach catalyst.

[0094] Hydrogen Peroxide Source: Suitable hydrogen peroxide sources include sodium perborate and / or sodium percarbonate.

[0095] Bleach Activators: Suitable bleach activators include tetraacetylethylenediamine and / or alkylphenol sulfonates.

[0096] Bleach catalyst: The composition may contain a bleach catalyst. Suitable bleach catalysts include oxaziridinium bleach catalysts, transition metal bleach catalysts, especially manganese and iron bleach catalysts. Suitable bleach catalysts have a structure that conforms to the following general formula:

[0097]

[0098] Where R 13 Selected from the group consisting of 2-ethylhexyl, 2-propylheptyl, 2-butyloctyl, 2-pentylnonyl, 2-hexyldecyl, n-dodecyl, n-tetradecyl, n-hexadecyl, n-octadecyl, isononyl, isodecyl, isotridecyl and isopentadecyl.

[0099] Preformed Peracids: Suitable preformed peracids include phthalimido-peroxycaproic acid.

[0100] Enzymes: Suitable enzymes include lipases, proteases, cellulases, amylases, and any combination thereof.

[0101] Proteases: Suitable proteases include metalloproteases and serine proteases. Examples of suitable neutral or alkaline proteases include: subtilisin (EC 3.4.21.62); trypsin-type or chymotrypsin-type proteases; and metalloproteases. Suitable proteases include chemically or genetically modified mutants of the aforementioned suitable proteases.

[0102] Suitable commercially available proteases include those sold under the trade names Liquanase Savinase and Those sold by Novozymes A / S (Denmark); under the trade name Prefer A series of proteases, including P280, P281, P2018-C, P2081-WE, P2082-EE and P2083-A / J, Purafect Purafect and Purafect Those sold by DuPont; under the trade name and Those sold by Solvay Enzymes; those purchased from Henkel / Kemira, namely BLAP (sequence shown in Figure 29 of US 5,352,604, with the following mutations: S99D+S101R+S103A+V104I+G159S, hereinafter referred to as BLAP); BLAP R (BLAP with S3T+V4I+V199M+V205I+L217D), BLAP X (BLAP with S3T+V4I+V205I) and BLAPF49 (BLAP with S3T+V4I+A194P+V199M+V205I+L217D), all from Henkel / Kemira; and KAP (alkalophilic Bacillus subtilisin with mutations A230V+S256G+S259N) from Kao.

[0103] Suitable proteases are described in WO11 / 140316 and WO11 / 072117.

[0104] Amylase: Suitable amylases are derived from AA560 alpha amylase endogenous to Bacillus sp. DSM 12649, preferably with the following mutations: R118K, D183*, G184*, N195F, R320K and / or R458K. Suitable commercially available amylases include Plus, Natalase, Ultra, SZ, (both from Novozymes) and AA, Preferenz Series of amylase, and Ox Am, HT Plus (both from DuPont).

[0105] Suitable amylases are described in WO06 / 002643.

[0106] Cellulase: Suitable cellulases include those derived from bacteria or fungi. Chemically modified or protein engineered mutants are also suitable. Suitable cellulases include cellulases from Bacillus, Pseudomonas, Humicola, Fusarium, Thielavia, Acremonium, such as fungal cellulases produced by Humicola insolens, Myceliophthora thermophila, and Fusarium oxysporum.

[0107] Commercially available cellulases include and Premium, and (Novozymes A / S), Series enzymes (DuPont), and Series enzymes (AB Enzymes). Suitable commercially available cellulases include Premium, Classic. Suitable proteases are described in WO07 / 144857 and WO10 / 056652.

[0108] Lipase: Suitable lipases include those of bacterial, fungal or synthetic origin, and variants thereof. Chemically modified or protein engineered mutants are also suitable. Examples of suitable lipases include lipases from Humicola (synonym Thermomyces), such as from H. lanuginosa (T. lanuginosus).

[0109] The lipase may be a "first cycle lipase", e.g., such as those described in WO06 / 090335 and WO13 / 116261. In one aspect, the lipase is a first wash lipase, preferably a variant of the wild-type lipase from Thermomyces lanuginosus comprising a T231R and / or N233R mutation. Preferred lipases include those sold under the trade name and Those sold by Novozymes (Bagsvaerd, Denmark).

[0110] Other suitable lipases include: Liprl 139, e.g., as described in WO2013 / 171241; and TfuLip2, e.g., as described in WO2011 / 084412 and WO2013 / 033318.

[0111] Other enzymes: Other suitable enzymes are bleaching enzymes such as peroxidases / oxidases, including those of plant, bacterial or fungal origin, and variants thereof. Commercially available peroxidases include (Novozymes A / S). Other suitable enzymes include choline oxidase and perhydrolase, such as those used in Gentle Power Bleach TM Those in .

[0112] Other suitable enzymes include those sold under the trade name (from Novozymes A / S, Bagsvaerd, Denmark) and Pectate lyase sold under the trade name (Novozymes A / S, Bagsvaerd, Denmark) and Mannanase sold by Du Pont.

[0113] Zeolite builder: The composition may contain a zeolite builder. The composition may contain from 0% to 5% by weight of a zeolite builder, or 3% by weight of a zeolite builder. The composition may even be substantially free of zeolite builder; substantially free means "no intentionally added". Typical zeolite builders include zeolite A, zeolite P and zeolite MAP.

[0114] Phosphate builder: The composition may contain a phosphate builder. The composition may contain from 0% to 5% by weight of a phosphate builder, or to 3% by weight of a phosphate builder. The composition may even be substantially free of phosphate builders; substantially free means "no intentionally added". A typical phosphate builder is sodium tripolyphosphate.

[0115] Carbonate: The composition may comprise carbonate. The composition may comprise 0 wt% to 10 wt% carbonate, or 0 wt% to 5 wt% carbonate. The composition may even be substantially free of carbonate; substantially free means "no intentionally added". Suitable carbonates include sodium carbonate and sodium bicarbonate.

[0116] Silicate: The composition may comprise a silicate. The composition may comprise 0 to 10 wt% silicate, or 0 to 5 wt% silicate. A preferred silicate is sodium silicate, particularly preferred is sodium silicate having a Na2O:SiO2 ratio of 1.0 to 2.8, preferably 1.6 to 2.0.

[0117] Sulphate: A suitable sulphate is sodium sulphate.

[0118] Brighteners: Suitable fluorescent brighteners include: distyrylbiphenyl compounds, such as CBS-X, diaminostilbene disulfonic acid compounds, e.g. DMS pure Xtra and HRH, and pyrazoline compounds, e.g. SN and coumarin compounds, e.g. SWN.

[0119] Preferred brighteners are: sodium 2(4-phenylvinyl-3-sulfophenyl)-2H-naphtho[1,2-d]triazole, disodium 4,4'-bis{[(4-phenylamino-6-(N-methyl-N-2-hydroxyethyl)amino1,3,5-triazine-2-yl)];amino}stilbene-2-2'disulfonate, disodium 4,4'-bis{[(4-phenylamino-6-morpholino-1,3,5-triazine-2-yl)]amino}stilbene-2-2'disulfonate and disodium 4,4'-bis(2-sulfonostyryl)biphenyl. A suitable fluorescent brightener is CI. Fluorescent brightener 260, which can be used in the form of its β or α crystalline form or a mixture of these crystalline forms.

[0120] Chelating agent: The composition may also include a chelating agent selected from the group consisting of diethylenetriamine pentaacetate, diethylenetriamine penta(methylphosphonic acid), ethylenediamine-N'N'-disuccinic acid, ethylenediamine tetraacetate, ethylenediamine tetra(methylenephosphonic acid) and hydroxyethane di(methylenephosphonic acid). Preferred chelating agents are ethylenediamine-N'N'-disuccinic acid (EDDS) and / or hydroxyethane diphosphonic acid (HEDP). The composition preferably includes ethylenediamine-N'N'-disuccinic acid or a salt thereof. Preferably, ethylenediamine-N'N'-disuccinic acid is in the form of the S,S enantiomer. Preferably, the composition includes 4,5-dihydroxy-isobenzene disulfonic acid disodium salt. Preferred chelating agents may also act as calcium carbonate crystal growth inhibitors, such as: 1-hydroxyethane diphosphonic acid (HEDP) and its salts; N,N-dicarboxymethyl-2-aminopentane-1,5-dioic acid and its salts; 2-phosphonobutane-1,2,4-tricarboxylic acid and its salts; and combinations thereof.

[0121] Hueing agents: Suitable hueing agents include small molecule dyes, typically belonging to the following Color Index (CI) classifications: acid dyes, direct dyes, basic dyes, reactive dyes (including their hydrolyzed forms), or solvent dyes or disperse dyes, such as dyes classified as blue, violet, red, green or black, and providing the desired hue, alone or in combination. Preferred such hues include acid violet 50, direct violet 9, 66 and 99, solvent violet 13, and any combination thereof.

[0122] Many hueing agents that may be suitable for use in the present invention are known and described in the art, such as the hueing agents described in WO2014 / 089386.

[0123] Suitable hueing agents include phthalocyanine and azo dye conjugates such as described in WO2009 / 069077.

[0124] Suitable toners can be alkoxylated. Such alkoxylated compounds can be prepared by organic synthesis, which can produce a mixture of molecules with different degrees of alkoxylation. Such mixtures can be used directly to provide toners, or can undergo purification steps to increase the ratio of the target molecule. Suitable toners include alkoxylated disazo dyes, such as those described in WO2012 / 054835, and / or alkoxylated thiophene azo dyes, such as those described in WO2008 / 087497 and WO2012 / 166768.

[0125] Toner can be incorporated in the detergent composition as a part for reaction mixture, and this reaction mixture is the result of organic synthesis dye molecules by one or more optional purification steps.This type of reaction mixture generally comprises dye molecules themselves, and can also comprise the by product of unreacted starting material and / or organic synthesis pathway in addition.Suitable toner can be incorporated in the hueing dye particles, such as described in WO 2009 / 069077.

[0126] Dye transfer inhibitors: Suitable dye transfer inhibitors include polyamine N-oxide polymers, copolymers of N-vinyl pyrrolidone and N-vinylimidazole, polyvinyl pyrrolidone, polyvinyl oxazolidones, polyvinyl imidazoles and mixtures thereof. Preferred are poly(vinyl pyrrolidone), poly(vinyl pyridine betaine), poly(vinyl pyridine N-oxide), poly(vinyl pyrrolidone-vinylimidazole) and mixtures thereof. Suitable commercially available dye transfer inhibitors include PVP-K15 and K30 (Ashland), HP165, HP50, HP53, HP59, HP56K, HP56, HP66 (BASF), S-400, S403E and S-100 (Ashland).

[0127] Fragrances: Suitable fragrances include fragrance materials selected from the following groups: (a) fragrance materials having a ClogP of less than 3.0 and a boiling point of less than 250°C (Quadrant 1 fragrance materials); (b) fragrance materials having a ClogP of less than 3.0 and a boiling point of 250°C or greater (Quadrant 2 fragrance materials); (c) fragrance materials having a ClogP of 3.0 or greater and a boiling point of less than 250°C (Quadrant 3 fragrance materials); (d) fragrance materials having a ClogP of 3.0 or greater and a boiling point of 250°C or greater (Quadrant 4 fragrance materials); and (e) mixtures thereof.

[0128] For spices, it is preferably in the form of spices delivery technology. Such delivery technology also stabilizes and enhances the release of deposition and spices materials from washed fabrics. Such spices delivery technology can also be used to further increase the persistence of releasing spices from washed fabrics. Suitable spices delivery technology includes: spices microcapsules, former spices, polymer-assisted delivery, molecule-assisted delivery, fiber-assisted delivery, amine-assisted delivery, cyclodextrin, starch-encapsulated accords, zeolites and other inorganic carriers, and any mixture thereof. Suitable spices microcapsules are described in WO2009 / 101593.

[0129] Silicones: Suitable silicones include polydimethylsiloxanes and amino-silicones. Suitable silicones are described in WO05075616.

[0130] Method for measuring total grinding force

[0131] Using Swissatest The test fabric determines the abrasive force from hand washing. This fabric allows the abrasive force during washing to be measured by measuring the loss of spots after force is applied to the fabric. Spot removal can then be quantified by a visual ruler or by a digital system imaging / analysis program.

[0132] We used test fabrics to create a known force calibration curve that enabled correlation to consumer hand wash abrasive forces.

[0133] Example

[0134] Example: Removing Difficult Colored Stains Using Soak and Force

[0135] Two laundry detergent compositions (Compositions 1 and 2) were prepared and tested as detailed below.

[0136] Test Method

[0137] I. Preparation of Test Compositions

[0138] The following detergent compositions were used for testing, material additions are shown as active material levels in (g).

[0139]

[0140]

[0141] II. Testing Procedure

[0142]

[0143] III. Preparation of complex colored stains for testing

[0144] a. Preprocessing

[0145] A 10 cm x 10 cm sample of 100% knitted cotton should be desized / stripped.

[0146] The samples were then washed 4 x 40C Cotton Short (Miele 1714) cycles with Ariel Colour liquid (35 g).

[0147] b. Artificial sweat

[0148]

[0149]

[0150] Store in the refrigerator for up to 1 week.

[0151] 1. At room temperature

[0152] 2. Pour 35 mL of sweat into the beaker.

[0153] 3. While monitoring the pH, add enough concentrated HCl dropwise until a pH of 5.5 is reached.

[0154] 4. Add 0.02 mL of bovine serum albumin (stored in the refrigerator) and mix well.

[0155] 5. Cover with aluminum foil and set aside until needed.

[0156] c. Artificial sebum

[0157] raw materials %raw material Tripalmitin 15.00％ Triolein 9.00％ Palmitic acid 13.00％ Oleic acid 13.00％ Palmitate 8.34％ Ethyl oleate 16.66％ cholesterol 5.00％ Squalene 20.00％ total: 100.00％

[0158] Store in a glass jar in the refrigerator for up to 3 months.

[0159] Take out more sebum than you need before use and heat it in a water bath at 55°C until it becomes liquid.

[0160] d. Deodorant

[0161] Buy a batch of Gillette Cool Wave Deodorant Gel.

[0162] e. Stain creation

[0163] For each stain sample you apply: 1g of deodorant, 1.2ml of sweat, 0.172ml of sebum.

[0164] start

[0165] 1. Using a template with a 5.0 cm circular hole, apply 1 g of the sebum and antiperspirant mixture directly onto the sample with a paintbrush to form a circular stain.

[0166] 2. Pipette the sweat into the center of the sample, concentrating the sweat over the previously applied stain mixture.

[0167] 3. After 1 hour, store at 55°C and 70RH overnight.

[0168] Day 2

[0169] 1. Remove the stain from the oven.

[0170] 2. Wash stains in Miele 1714 with 35g Ariel Colour liquid and 3kg ballast on 40C cotton short cycle. Include 1.5 WFK SBL2004 tablets per wash per 25 stains.

[0171] 3. Dry in a gas dryer at low temperature for 30 minutes.

[0172] 4. Repeat the stain application procedure from Day 1.

[0173] Day 3 and 4

[0174] 1. Repeat the procedure on Day 2.

[0175] Day 5

[0176] 1. Wash the stain as above. The stain is now ready for use.

[0177] IV: Soak / Strike / Rinse / Dry :

[0178] Test compositions (1) and (2) were dissolved in 3L of water via manual mixing for 30 seconds. Complex colored stains were added to the soaking conditions with appropriate products. Each stain was then subjected to either 0.05 or 3.05 Kg force.

[0179] Apply weight to the top of the brush, over the stain sample. Then move the weighted brush across the stain surface from left to right in a single motion to cover the entire stain.

[0180] An additional set of tests was also performed in the absence of any soaking and in which the test composition (1) was used only to wet the stain prior to the force application step. All stains were then rinsed in fresh water before being left to dry overnight under ambient conditions.

[0181] After drying, all complex colored stains were measured via spectrophotometer. The following results show the measured WI CIE of all replicates.

[0182] V: Results :

[0183]

[0184] This example demonstrates the efficacy of Composition 1 in delivering improved removal of complex colored soils under immersion and forces >0.05 Kg.

[0185] The dimensions and values ​​disclosed herein are not to be understood as being strictly limited to the exact numerical values ​​cited. Instead, unless otherwise indicated, each such dimension is intended to represent the stated value and a functionally equivalent range around that value. For example, a dimension disclosed as "40 mm" is intended to mean "about 40 mm".

Claims

1. A method for washing fabrics, wherein the method comprises the following steps: (a) contacting 10 g to 100 g of an acidic solid laundry detergent composition with 1.01 L to 10.0 L of water to form an acidic aqueous wash bath having a pH in the range of 2.0 to 3.0, wherein the acidic solid laundry detergent composition comprises 10 wt % to 70 wt % of an acidic component and 1.0 wt % to 20 wt % of a detersive surfactant; (b) contacting a soiled fabric with said acidic aqueous washing bath and washing said soiled fabric in said acidic aqueous washing bath for a period of 20 minutes to 24 hours, (c) removing the washed fabric from the acidic aqueous washing bath; (d) subjecting the soiled fabric from step (c) to a total abrasive force of from 1.5 kg to 10 kg; as well as (e) rinsing the washed fabric with water.

2. The method of claim 1, wherein during step (d), the soiled fabric is subjected to a total abrasive force of 2.0 kg to 6.0 kg.

3. A method according to any preceding claim wherein the acidic solid laundry detergent composition comprises from 30 wt% to 70 wt% acidic component and from 3.0 wt% to 10 wt% detersive surfactant.

4. A method according to any preceding claim, wherein during step (b) the soiled fabric is washed in the acidic aqueous washing bath for a period of from 30 minutes to 3 hours.

5. A process according to any preceding claim, wherein step (b) is carried out at an acidic aqueous wash bath temperature of from 5°C to 25°C.

6. A method according to any preceding claim, wherein the acidic component is a polycarboxylic acid.

7. A method according to any preceding claim, wherein the acidic component is citric acid.

8. The method of any preceding claim, wherein the detersive surfactant is selected from the group consisting of alkylbenzene sulfonates, alkyl sulfates, alkoxylated alkyl sulfates, alkoxylated alcohols, and any combination thereof.

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