EP2300586B1 - Improvements relating to fabric cleaning - Google Patents
Improvements relating to fabric cleaning Download PDFInfo
- Publication number
- EP2300586B1 EP2300586B1 EP09765764.7A EP09765764A EP2300586B1 EP 2300586 B1 EP2300586 B1 EP 2300586B1 EP 09765764 A EP09765764 A EP 09765764A EP 2300586 B1 EP2300586 B1 EP 2300586B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- surfactant
- composition
- soap
- better
- lipase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Revoked
Links
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- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
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- 238000010348 incorporation Methods 0.000 description 1
- 238000010409 ironing Methods 0.000 description 1
- SUMDYPCJJOFFON-UHFFFAOYSA-N isethionic acid Chemical class OCCS(O)(=O)=O SUMDYPCJJOFFON-UHFFFAOYSA-N 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
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- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 150000002690 malonic acid derivatives Chemical class 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
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- 239000003550 marker Substances 0.000 description 1
- HNEGQIOMVPPMNR-NSCUHMNNSA-N mesaconic acid Chemical compound OC(=O)C(/C)=C/C(O)=O HNEGQIOMVPPMNR-NSCUHMNNSA-N 0.000 description 1
- 125000001434 methanylylidene group Chemical group [H]C#[*] 0.000 description 1
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 1
- XJRBAMWJDBPFIM-UHFFFAOYSA-N methyl vinyl ether Chemical compound COC=C XJRBAMWJDBPFIM-UHFFFAOYSA-N 0.000 description 1
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- QQBPIHBUCMDKFG-UHFFFAOYSA-N phenazopyridine hydrochloride Chemical group Cl.NC1=NC(N)=CC=C1N=NC1=CC=CC=C1 QQBPIHBUCMDKFG-UHFFFAOYSA-N 0.000 description 1
- HXITXNWTGFUOAU-UHFFFAOYSA-N phenylboronic acid Chemical class OB(O)C1=CC=CC=C1 HXITXNWTGFUOAU-UHFFFAOYSA-N 0.000 description 1
- WTJKGGKOPKCXLL-RRHRGVEJSA-N phosphatidylcholine Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@H](COP([O-])(=O)OCC[N+](C)(C)C)OC(=O)CCCCCCCC=CCCCCCCCC WTJKGGKOPKCXLL-RRHRGVEJSA-N 0.000 description 1
- UEZVMMHDMIWARA-UHFFFAOYSA-M phosphonate Chemical compound [O-]P(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-M 0.000 description 1
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- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- KUIXZSYWBHSYCN-UHFFFAOYSA-L remazol brilliant blue r Chemical compound [Na+].[Na+].C1=C(S([O-])(=O)=O)C(N)=C2C(=O)C3=CC=CC=C3C(=O)C2=C1NC1=CC=CC(S(=O)(=O)CCOS([O-])(=O)=O)=C1 KUIXZSYWBHSYCN-UHFFFAOYSA-L 0.000 description 1
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- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
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- 159000000000 sodium salts Chemical class 0.000 description 1
- SZINDZNWFLBXKV-UHFFFAOYSA-M sodium;2-(2-hydroxyethoxy)ethanesulfonate Chemical group [Na+].OCCOCCS([O-])(=O)=O SZINDZNWFLBXKV-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- 125000001424 substituent group Chemical group 0.000 description 1
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- 239000002600 sunflower oil Substances 0.000 description 1
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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
- C11D3/37—Polymers
- C11D3/3703—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C11D3/3723—Polyamines or polyalkyleneimines
-
- 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
- C11D3/38627—Preparations containing enzymes, e.g. protease or amylase containing lipase
-
- 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
- C11D3/38681—Chemically modified or immobilised enzymes
-
- C11D2111/12—
Description
- The present invention is concerned with improvements relating to fabric cleaning and, in particular, with an improved process for laundering fabrics using a concentrated detergent.
- Isotropic liquid detergents for use in laundry comprise varying concentration levels of surfactant. 10 to 15 %wt is commonplace in Portugal and Spain, 18 to 27 %wt typical in the Benelux countries, Germany and Italy, while levels of 35 to 40 %wt surfactant have been used in the UK and France.
- While moderately concentrated detergent compositions for laundry use have been known from the literature and available in the marketplace for some time, there has been a recent trend towards more concentrated liquid products and a "three-times concentrate" (Persil™ "Small and Mighty") was launched in the UK. The dosage instructions for this product suggest that 35 ml of the composition should be used for a normal product load. With less concentrated products volume dosages are typically higher, so as to reach the same in-wash concentrations of non-soap surfactant.
- Reasons for this trend towards concentrated products have included a desire to make more environmentally friendly products, which use less packaging, require fewer chemicals for their manufacture and require less energy to manufacture and transport them. Concentrated products also offer the advantages of taking up less shelf and storage space. Concentrated products deliver the same level of surfactant into the wash liquor from a smaller volume of product, and they are generally formulated by taking water out.
- However, there are limits to the extent to the benefits which can be obtained by simply concentrating products. Particular problems occur with dispensing and delivery of products. For example, at particularly high concentrations liquid products may exhibit unacceptable or unstable viscosities and solid products may exhibit hydroscopicity and poor flow or caking. These known disadvantages, such as maintenance of product stability, pourability and product appearance have lead to a number of proposals.
- A "four times" concentrate has been launched in Australia under the brand name "Orange power" and is described as "a 4x concentrate enzyme liquid detergent". Its dosage recommendation is 25 ml (a cupful) for top loading washing machines and ¾ of a cap for front loaders.
- Unit dosage has been suggested to overcome some of the known problems but this can lead to dissolution problems. Moreover, rising cost of surfactants, especially those from oil-based materials has led to pressures to remove surfactant as well.
-
WO 2004/074419 (Novozyme) suggests the replacement of part of the surfactant, builder, bleach, and fillers in a detergent with enzymes. This is said to result in a significant reduction of the volume and weight of the detergent necessary for one wash. After partial replacement by enzymes, levels of surfactant of less than 30 wt% preferably 4 to 20wt%, more preferably 5 to 15 wt% are disclosed. Any soil suspending polymer is said to be reduced to 0 to 6 wt% after it too is partially or fully replaced by enzymes. Lipase is used to boost oily soil detergency. In the examples in-wash non-soap surfactant levels as low as 0.18 g/L are disclosed. The drawback with the approach suggested in this document is that it is too dependent on enzymes which are expensive and are sensitive to storage and use conditions. Furthermore the stains selected to exemplify cleaning are apparently chosen to be responsive to enzymes and consequently do not demonstrate the solution to the more realistic problem of detergency against everyday dirt and stains, such as clay. -
WO 2006/113314 (P&G ) discloses a liquid laundry detergent composition comprising: - (a) from about 5 to about 20000 LU/g of a "first wash" lipase, which is a polypeptide having an amino acid sequence which has at least 90% identity with the wild-type lipase derived from Humicola lanuginosa strain DSM 4109, and,
- (b) from about 0.01 wt % to about 10 wt % by weight of the composition of a modified polyethyleneimine polymer which comprises a polyethyleneimine backbone of about 300 to about 10000 weight average molecular weight; and
- (c) the balance of the composition comprising a liquid carrier.
- This patent publication states that alkyl ethoxy sulfate surfactant may be present in the composition from about 5% to about 30%; or from about 7% to 16% by weight of the composition. Additional surfactants include up to 7% of nonionic and/or anionic co-surfactants. Aqueous washing solutions are disclosed to comprise 500 to 7,000 ppm (0.5 to 7 g/L) of the composition, preferably 1000 to 3000 ppm. If the non-soap surfactant level varies from 11 to 21 wt%, as in the examples, this would provide a preferred wash solution non-soap surfactant concentration of from 0.1 to 0.6 g/l. Although the general disclosure allows for high levels of EPEI, the actual levels used are too low to realise the benefit from the low dose of surfactant to the wash from a low volume dose of the composition.
- We have now determined that significant benefits as regards elements of the environmental footprint of the laundering process may be obtained by using low dosages of concentrated products of a specific formulation class at relatively high dilution. Surprisingly, fully formulated products according to the present invention exhibit better removal of everyday dirt and stains than commercial products which, in use, are dosed at much higher surfactant levels. For reasons which will be explained further below the claimed products also outperform the closest prior art in terms of treatment of everyday dirt and stains at an equivalent dose of chemicals.
- Accordingly, a first aspect of the present invention provides a method of laundering fabric which comprises the steps of:
- a) providing a pourable liquid detergent composition comprising ethoxylated polyethyleneimine, soil release polymer and 10 to 40% wt of surfactant, essentially consisting of nonionic and/or anionic and/or zwitterionic surfactant which 10 to 40% wt of surfactant preferably passes the Calcium Tolerance Test described herein, and in addition, no more than 15% wt, preferably no more than 10%wt, of a soap, with the provise that any soap present is present as a minority in wt% terms of the total surfactant, wherein the ratio of non-soap surfactant to ethoxylated polyethylene imine is from 2:1 to 7:1,
- b) diluting a dose of said detergent composition in water by a factor of greater than 500 to obtain a wash liquor which comprises 0.8 to 0.035, preferably 0.5 to 0.05, g/l of non-soap surfactant, and,
- c) washing fabrics with the wash liquor so formed.
- In typical use conditions, this would involve a dosage of about 20ml of concentrated composition into a washing machine which may hold 10 to 15 litres of water.
- In the context of the present invention, pourable means that it can be poured. Preferably it has a shear viscosity (at 25 Celcius) of below preferably below 2 Pa.s at a shear rate of 21s-1. Preferred viscosities are in the range 1.0 - 0.1 Pa.s. The composition may be shear thinning.
- Larger dosage units can be employed but it is preferred that the dose is less than 35 ml, more preferably less than 30 ml, and most preferably less than 25 ml per wash, even being 20 ml or less per wash. Preferably, the wash liquor obtained comprises 0.25 to 0.55 g/l of non-soap surfactant, for example 0.4 g/L or lower. Doses may be measured by hand, more preferably metered by a suitable device or provided as pre-measured unit doses. The use of a container with metering means to deliver a dose with a dose to dose variability of less than 20 %wt and preferably less than 10 %wt is preferred.
- The Calcium Tolerance Test used herein is that defined in
EP1771543 . A surfactant blend is prepared at a concentration of 0.7 g/l in water containing sufficient calcium ions to give a French Hardness of 40 degrees. Other electrolytes such as sodium chloride, sodium sulphate, sodium hydroxide are added as necessary to adjust the ionic strength to 0.5M and the pH to 10. The absorption of light of wavelength 540 nm through 4 mm of sample is measured 15 minutes after sample preparation. Ten measurements are made and an average value is calculated. Samples that give an absorption value of less than 0.08 are deemed to be calcium tolerant. - The dilution factor in the method of the first aspect of the present invention is by a factor of at least 500, by which is meant that one volume of composition is mixed with at least 500 volumes of water. The dilution factor is preferably less than 2500. Particularly preferred dilution factors fall in the range of 500 to 1500, most preferably 500 to 1000.
- Preferably the detergent composition comprises not more than 35 %wt, even more preferably not more than 30 %wt, of non-soap surfactant. Typically the total surfactant will be a mixture of nonionic and anionic surfactant. Preferably, the anionic surfactant is predominately, and more preferably essentially, a non-soap anionic surfactant. In particularly preferred embodiments of the invention the anion of the anionic surfactant is selected from the group consisting of linear alkyl benzene sulphonate (LAS), primary alkyl sulphate (PAS), alkyl ether sulphate (AES) and mixtures thereof. In some embodiments zwitterionic surfactants are used as part of the surfactant mixture. Zwitterionics, in particular betaines, improve particulate soil detergency in the compositions of the invention.
- We have determined that instead of further pursuing attempts to deliver the same levels of surfactant in the wash liquor from smaller quantities of product, it is more effective to deliver smaller quantities of surfactant into the wash liquor and rebalance the cleaning performance using EPEI with soil-release polymers, optionally within catalytic cleaning systems, preferably including a lipase enzyme, and optical modifiers, preferably shading dye and/or fluorescer. However, it is advantageous not to remove surfactants completely from the composition.
- In order to further concentrate (or compact) the prior art compositions like Persil Small and Mighty™ to achieve a 5x concentrate (20ml dose) containing the same level of nonsoap surfactant active would result in an 82 wt% active mix (expressed as neutralised surfactant). At this level of active if one tries to add in the other ingredients found in the existing products to give the same in wash concentrations then the formulation becomes 87.3 wt% solids before one attempts to include the necessary buffer/ hydrotrope or neutralisation agent. At such high levels of incorporation the system either becomes impossible or else it is so constrained in terms of surfactant type that may be used that it becomes an impractical commercial proposition. (E.g. use of 100% NI surfactant). So, for example, for a typical LAS, nonionic, SLES and soap, surfactant system: 10% MEA and 10% of a hydrotrope such as MPG is required to achieve a stable composition with the desired pH. This would be impossible even with zero water present if the other ingredients already add up to over 80 wt%.
- We have also found that there are many benefits in reducing the level of surfactant as regards the efficiency of deposition of certain polymers, for instance soil release polymers, and other benefit agents.
- A particularly advantageous benefit of the reduction of surfactant levels in the wash using the method and composition of the invention is that shading dyes are better deposited.
- Preferably, the method of the invention is conducted in a washing machine, more preferably in a non-vertical axis machine, most preferably in a horizontal-axis machine with a drawer dispensing system.
- As noted above, the performance of the compositions in the method according to the invention may be further improved by the presence of one or more of enzymes, further polymers and shading dyes.
- It is particularly preferable that at least one enzyme is present in the compositions of the invention. Lipase is a particularly preferred enzyme. The composition prior to the dilution step (b) preferably contains from about 5 to about 20000 LU/g of a lipase. Preferred lipase enzymes include those of bacterial or fungal origin. Chemically modified or protein engineered mutants are included. Examples of useful lipases include lipases from Humicola, more preferably ones which comprise a polypeptide having an amino acid sequence which has at,least 90% sequence identity with the wild-type lipase derived from Humicola lanuginose, most preferably strain DSM 4109. However, at the low surfactant levels employed in the present invention it has been determined that so-called "multi-wash" lipase enzymes show a single-wash benefit. The amount of lipase enzyme protein used in the wash is set to be at the high side of what is normal (>5mg, pref greater than 8mg per wash). This means that the amount in the composition is higher than typically found in liquid detergents. This can be seen by the ratio of non-soap surfactant to lipase enzyme, in particular. A particularly preferred lipase enzyme is available under the trademark Lipoclean™ from Novozymes.
- As will be described in further detail below, a range of possible polymers may be employed to improve the performance of the compositions used in the method of the present invention. Again, the efficacy of these polymers is much improved by the reduction in the level of surfactant present in the wash. The ratio of polymer to surfactant is also set to be higher than normal.
- One polymer is the fabric-substantive polymers comprising at least one of (i) saccharide or (ii) dicarboxylic acid and polyol monomer units. Typically these have soil release properties while they can have a primary detergency effect the generally assist in subsequent cleaning. Preferably these should be present at a level of at least 2%wt preferably at least 3% of the composition.
- Another polymer is ethoxylated polyethylene imine. Polyethylene imines are materials composed of ethylene imine units -CH2CH2NH- and, where branched, the hydrogen on the nitrogen is replaced by another chain of ethylene imine units. These polyethyleneimines can be prepared, for example, by polymerizing ethyleneimine in the presence of a catalyst such as carbon dioxide, sodium bisulfite, sulfuric acid, hydrogen peroxide, hydrochloric acid, acetic acid, and the like. Specific methods for preparing these polyamine backbones are disclosed in
U.S. Pat. No. 2,182,306, Ulrich et al., issued Dec. 5, 1939 ;U.S. Pat. No. 3,033,746, Mayle et al., issued May 8, 1962 ;U.S. Pat. No. 2,208,095, Esselmann et al., issued Jul. 16, 1940 ;U.S. Pat. No. 2,806,839, Crowther, issued Sep, 17, 1957 ; andU.S. Pat. No. 2,53,696, Wilson, issued May 21, 1951 . - Preferentially, these comprise a polyethyleneimine backbone of about 300 to about 10000 weight average molecular weight; wherein the modification of the polyethyleneimine backbone is:
- a) one or two alkoxylation modifications per nitrogen atom in the polyethyleneimine backbone, the alkoxylation modification comprising the replacement of a hydrogen atom by a polyalkoxylene chain having an average of about 1 to about 40 alkoxy moieties per modification, wherein the terminal alkoxy moiety of the alkoxylation modification is capped with hydrogen, a C1-C4 alkyl, an anionic group or mixtures thereof;
- b) a substitution of one C1-C4 alkyl moiety and one or two alkoxylation modifications per nitrogen atom in the polyethylaneimine backbone, the alkoxylation modification comprising the replacement of a hydrogen atom by a polyalkoxylene chain having an average of about 1 to about 40 alkoxy moieties per modification wherein the terminal alkoxy moiety is capped with hydrogen, a C1-C4 alkyl an anionic group or mixtures thereof; or
- c) a combination thereof.
- The polyethyleneimine polymer is present in the composition provided in step (a), prior to the dilution step (b), preferably at a level of between 0.01 and 25 wt%, but more preferably at a level of at least 3 wt% and/or less than 9,5 wt%, most preferably from 4 to 9 wt% and with a ratio of non-soap surfactant to EPEI of from 2:1 to 7:1, preferably from 3:1 to 6:1, or even to 5:1.
- The combination of low non-soap surfactant and the presence of both lipase and polyethyleneimine has been found particularly advantageous and a preferred method of laundering fabric according the present invention comprises the step
- a) providing the pourable liquid detergent composition as defined in claim 1, the composition further comprising 5 to 2.000 LU/g lipase.
- Significantly, the invention, while using less surfactant per wash than fully formulated commercial compositions exhibit at least parity in performance and on many stains and dirt show improved performance.
- The compositions of step (a) of the process may be provided either in a multidose container or in the form of a liquid unit dose in a soluble sachet.
- In a further aspect of the invention the concentrated composition is prediluted with a small amount of water to enable the normal volume to be dosed (e.g. 35 ml). This retains the advantages of a low amount of chemical dosed per wash and if the dilution step is carried out when the composition is bottled it can aid in the stability of the formulation on storage. When this process modification is used the dilution factor will be adjusted to compensate for the greater dose of more dilute material added to the wash. Thus the extent of dilution can be as low as 280 volumes of water to one dose from the bottle of the concentrate with extra make up water in a multi-dose bottle.
- Thus according to a third aspect of the invention there is provided a method of laundering fabric which comprises the steps of:
- a) providing a multidose container which contains a pourable liquid detergent composition comprising ethoxylated polyethylene imine, soil release polymer, 10-40% wt of surfactant, essentially consisting of nonionic and/or anionic and/or zwitterionic surfactant, and in addiction, no more than 15% wt, preferably no more than 10%wt, of a soap, with the proviso that any soap present is present as a minority in wt% terms of the total surfactant,
- b) mixing a dose of the detergent composition comprising 4 to 8 g non-soap surfactant, at least 0.5 g of the soil release polymer and at least 0.5 g of the ethoxylated polyethyleneimine with water to obtain a wash liquor wherein the ratio of non-soap surfactant to ethoxylated polyethyleneimine is from 2:1 to 7:1, and
- c) washing fabrics with the wash liquor so formed.
- Advantageously, the dose in step (b) further comprises at least 0.01 g active lipase protein (or greater than 2500 LU). The dose, prior to dilution, should contain 5 to 20 000 LU/g when lipase is present.
- In order that the invention may be further and better understood and carried forth into practice it will be described hereinafter with reference to various preferential but non-limiting features.
- Surfactants assist in removing soil from the textile materials and also assist in maintaining removed soil in solution or suspension in the wash liquor. Anionic and/or nonionic surfactants, preferably in a calcium tolerant blend, are an essential feature of the present invention. Surfactant systems which consist only of linear alkyl benzene sulphonate (LAS) are generally calcium intolerant.
- When required, in order to ensure calcium tolerance, surfactant systems should generally avoid having levels of LAS above 90 %wt. Nonionic-free systems with 95 %wt LAS can be made provided that some zwitterionic surfactant, such as sulphobetaine, is present. Generally it is preferred to use less than 90 %wt LAS and at least 10%wt of nonionic surfactant.
- Preferred alkyl ether sulphates are C8-C15 alkyl and have 2-10 moles of ethoxlation. Preferred alkyl sulphates are alkylbenzene sulphonates, particularly linear alkylbenzene sulphonates having an alkyl chain length of C8-C15. The counter ion for anionic surfactants is generally an alkali metal, typically sodium, although other counter-ions such as MEA, TEA or ammonium can be used. Suitable anionic surfactant materials are available in the marketplace as the 'Genapol'™ range from Clariant.
- Nonionic surfactants include primary and secondary alcohol ethoxylates, especially C8-C20 aliphatic alcohol ethoxylated with an average of from 1 to 20 moles of ethylene oxide per mole of alcohol, and more especially the C10-C15 primary and secondary aliphatic alcohols ethoxylated with an average of from 1 to 10 moles of ethylene oxide per mole of alcohol. Non-ethoxylated nonionic surfactants include alkyl polyglycosides, glycerol monoethers and polyhydroxy amides (glucamide). Mixtures of nonionic surfactant may be used. When included therein the composition contains from 0.2 wt% to 40 wt%, preferably 1 wt% to 20 wt%, more preferably 5 to 15 wt% of a non-ionic surfactant, such as alcohol ethoxylate, nonylphenol ethoxylate, alkylpolyglycoside, alkyldimethylamineoxide, ethoxylated fatty acid monoethanolamide, fatty acid monoethanolamide, polyhydroxy alkyl fatty acid amide, or N-acyl N-alkyl derivatives of glucosamine ("glucamides").
- Nonionic surfactants that may be used include the primary and secondary alcohol ethoxylates, especially the C8-C20 aliphatic alcohols ethoxylated with an average of from 1 to 35 moles of ethylene oxide per mole of alcohol, and more especially the C10-C15 primary and secondary aliphatic alcohols ethoxylated with an average of from 1 to 10 moles of ethylene oxide per mole of alcohol.
- As noted above, shading dye can be used to improve the performance of the compositions used in the method of the present invention. The deposition of shading dye onto fabric is improved when they are used in compositions of the invention and according to the process of the invention. Preferred dyes are violet or blue. It is believed that the deposition on fabrics of a low level of a dye of these shades, masks yellowing of fabrics. A further advantage of shading dyes is that they can be used to mask any yellow tint in the composition itself.
- Suitable and preferred classes of dyes are discussed below.
- Direct dyes (otherwise known as substantive dyes) are the class of water soluble dyes which have a affinity for fibres and are taken up directly. Direct violet and direct blue dyes are preferred.
- Preferably the dye are bis-azo or tris-azo dyes are used.
-
- ring D and E may be independently naphthyl or phenyl as shown;
- R1 is selected from: hydrogen and C1-C4-alkyl, preferably hydrogen;
- R2 is selected from: hydrogen, C1-C4-alkyl, substituted or unsubstituted phenyl and substituted or unsubstituted naphthyl, preferably phenyl;
- R3 and R4 are independently selected from: hydrogen and C1-C4-alkyl, preferably hydrogen or methyl;
- X and Y are independently selected from: hydrogen, C1-C4-alkyl and C1-C4-alkoxy; preferably the dye has X= methyl; and, Y = methoxy and n is 0, 1 or 2, preferably 1 or 2.
- Preferred dyes are direct violet 7, direct violet 9, direct violet 11, direct violet 26, direct violet 31, direct violet 35, direct violet 40, direct violet 41, direct violet 51, and direct violet 99. Bis-azo copper containing dyes such as direct violet 66 may be used. The benzidene based dyes are less preferred.
- Preferably the direct dye is present at 0.000001 to 1 wt% more preferably 0.00001 wt% to 0.0010 wt% of the composition.
- In another embodiment the direct dye may be covalently linked to the photo-bleach, for example as described in
WO2006/024612 . - Cotton substantive acid dyes give benefits to cotton containing garments. Preferred dyes and mixes of dyes are blue or violet. Preferred acid dyes are:
- (i) azine dyes, wherein the dye is of the following core structure:
- Preferred azine dyes are: acid blue 98, acid violet 50, and acid blue 59, more preferably acid violet 50 and acid blue 98.
- Other preferred non-azine acid dyes are acid violet 17, acid black 1 and acid blue 29.
- Preferably the acid dye is present at 0.0005 wt% to 0.01 wt% of the formulation.
- The composition may comprise one or more hydrophobic dyes selected from benzodifuranes, methine, triphenylmethanes, napthalimides, pyrazole, napthoquinone, anthraquinone and mono-azo or di-azo dye chromophores. Hydrophobic dyes are dyes which do not contain any charged water solubilising group. Hydrophobic dyes may be selected from the groups of disperse and solvent dyes. Blue and violet anthraquinone and mono-azo dye are preferred.
- Preferred dyes include solvent violet 13, disperse violet 27 disperse violet 26, disperse violet 28, disperse violet 63 and disperse violet 77.
- Preferably the hydrophobic dye is present at 0.0001 wt% to 0.005 wt% of the formulation.
- Basic dyes are organic dyes which carry a net positive charge. They deposit onto cotton. They are of particular utility for used in composition that contain predominantly cationic surfactants. Dyes may be selected from the basic violet and basic blue dyes listed in the Colour Index International.
- Preferred examples include triarylmethane basic dyes, methane basic dye, anthraquinone basic dyes, basic blue 16, basic blue 65, basic blue 66, basic blue 67, basic blue 71, basic blue 159, basic violet 19, basic violet 35, basic violet 38, basic violet 48; basic blue 3, basic blue 75, basic blue 95, basic blue 122, basic blue 124, basic blue 141.
- Reactive dyes are dyes which contain an organic group capable of reacting with cellulose and linking the dye to cellulose with a covalent bond. They deposit onto cotton.
- Preferably the reactive group is hydrolysed or reactive group of the dyes has been reacted with an organic species such as a polymer, so as to the link the dye to this species. Dyes may be selected from the reactive violet and reactive blue dyes listed in the Colour Index International.
- Preferred examples include reactive blue 19, reactive blue 163, reactive blue 182 and reactive blue, reactive blue 96.
- Dye conjugates are formed by binding direct, acid or basic dyes to polymers or particles via physical forces. Dependent on the choice of polymer or particle they deposit on cotton or synthetics. A description is given in
WO2006/055787 . Particularly preferred dyes are: direct violet 7, direct violet 9, direct violet 11, direct violet 26, direct violet 31, direct violet 35, direct violet 40, direct violet 41, direct violet 51, direct violet 99, acid blue 98, acid violet 50, acid blue 59, acid violet 17, acid black 1, acid blue 29, solvent violet 13, disperse violet 27 disperse violet 26, disperse violet 28, disperse violet 63, disperse violet 77 and mixtures thereof. - In order to further improve whiteness, it is convenient and advantageous to include a fluorescer in the compositions of the invention. The composition therefore preferably further comprises a 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 classes of fluorescer are: Di-styryl biphenyl compounds, e.g. Tinopal (Trade Mark) CBS-X, Di-amine stilbene di-sulphonic acid compounds, e.g. Tinopal DMS pure Xtra and Blankophor (Trade Mark) HRH, and Pyrazoline compounds, e.g. Blankophor SN.
- Preferred fluoxescers are: sodium 2 (4-styryl-3-sulfophenyl)-2H-napthol[1,2-d]trazole, disodium 4,4'-bis[[(4-anilino-6-(N methyl-N-2 hydroxyethyl) amino 1,3,5-triazin-2-yl)]amino}stilbene-2-2' disulfonate, disodium 4,4'-bis{[(4-anilino-6-morpholino-1,3,5-triazin-2-yl)]amino} stilbene-2-2' disulfonate, and disodium 4,4'-bis(2-sulfoslyryl)biphenyl.
- Shading dye can be used in the absence of fluorescer, but it is specially preferred to use a shading dye in combination with a fluorescer, for example in order to reduce yellowing due to chemical changes in adsorbed fluorescer.
- A particularly preferred embodiment, the present invention provides a method of laundering fabric which comprises the steps of:
- a) providing a pourable liquid detergent composition as defined above further comprising a shading dye comprising blue violet dye, preferably with an optical adsorption peak in the range 540-600nm, preferably a bis-azo direct dye, preferably at a level of 0.000001-1wt%.
- The composition optionally comprises fluorescer, preferably at a level of 0.005 to 2 wt %, and,
- The composition comprises polymers. Polymers can assist in the cleaning process by helping to retain soil in solution or suspension and/or preventing the transfer of dyes. Polymers can also assist in the soil removal process. Dye transfer, anti-redeposition and soil-release polymers are described in further detail below.
- Detergent compositions often employ polymers as so-called 'dye-transfer inhibitors'. These prevent migration of dyes, especially during long soak times. Any suitable dye-transfer inhibition agents may be used in accordance with the present invention. Generally, such dye-transfer inhibiting agents include polyvinyl pyrrolidone polymers, polyamine N-oxide polymers, copolymers of N-vinylpyrrolidone and N-vinylimidazole, manganese phthalocyanine, peroxidases, and mixtures thereof.
- Nitrogen-containing, dye binding, DTI polymers are preferred. Of these polymers and co-polymers of cyclic amines such as vinyl pyrrolidone (PVP), and/or vinyl imidazole (PVI) are preferred.
- Polyamine N-oxide polymers suitable for use herein contain units having the following structural formula: R-Ax-P; wherein P is a polymerizable unit to which an N-O group can be attached or the N-O group can form part of the polymerizable unit; A is one of the following structures: - NC(O)-, -C(O)O-, -S-, -O-, -N=; x is 0 or 1; and R is an aliphatic, ethoxylated aliphatic, aromatic, heterocyclic or alicyclic group or combination thereof to which the nitrogen of the N-O group can be attached or the N-O group is part of these groups, or the N-O group can be attached to both units.
- Preferred polyamine N-oxides are those wherein R is a heterocyclic group such as pyridine, pyrrole, imidazole, pyrrolidine, piperidine and derivatives thereof. The N-O group can be represented by the following general structures: N(O)(R')0-3, or =N(O) (R')0-1, wherein each R' independently represents an aliphatic, aromatic, heterocyclic or alicyclic group or combination thereof; and the nitrogen of the N-O group can be attached or form part of any of the aforementioned groups. The amine oxide unit of the polyamine N-oxides has a pKa<10, preferably pKa<7, more preferably pKa< 6.
- Any polymer backbone can be used provided the amine oxide polymer formed is water-soluble and has dye transfer inhibiting properties. Examples of suitable polymeric backbones are polyvinyls, polyalkylenes, polyesters, polyethers, polyamides, polyimides, polyacrylates and mixtures thereof. These polymers include random or block copolymers where one monomer type is an amine N-oxide and the other monomer type is an N-oxide. The amine N-oxide polymers typically have a ratio of amine to the amine N-oxide of 10:1 to 1:1,000,000. However, the number of amine oxide groups present in the polyamine oxide polymer can be varied by appropriate copolymerization or by an appropriate degree of N-oxidation. The polyamine oxides can be obtained in almost any degree of polymerization. Typically, the average molecular weight is within the range of 500 to 1,000,000; more preferably 1,000 to 500,000; most preferably 5,000 to 100,000. This preferred class of materials is referred to herein as "PVNO". A preferred polyamine N-oxide is poly(4-vinylpyridine-N-oxide) which as an average molecular weight of about 50,000 and an amine to amine N-oxide ratio of about 1:4.
- Copolymers of N-vinylpyrrolidone and N-vinylimidazole polymers (as a class, referred to as PVPVI) are also preferred. Preferably the PVPVI has an average molecular weight range from 5,000 to 1,000,000, more preferably from 5,000 to 200,000, and most preferably from 10,000 to 20,000, as determined by light scattering as described in Barth, et al., Chemical Analysis, Vol. 113. "Modern Methods of Polymer Characterization". The preferred PVPVI copolymers typically have a molar ratio of N-vinylimidazole to N-vinylpyrrolidone from 1:1 to 0.2:1, more preferably from 0.8:1 to 0.3:1, most preferably from 0.6:1 to 0.4:1. These copolymers can be either linear or branched. Suitable PVPVI polymers include Sokalan(™) HP56, available commercially from BASF, Ludwigshafen, Germany.
- Also preferred as dye transfer inhibition agents are polyvinylpyrrolidone polymers (PVP) having an average molecular weight of from about 5,000 to about 400,000, preferably from about 5,000 to about 2000,000, and more preferably from about 5,000 to about 50,000. PVP's are disclosed for example in
EP-A-262,897 EP-A-256,696 - Also suitable as dye transfer inhibiting agents are those from the class of modified polyethyleneimine polymers, as disclosed for example in
WO-A-0005334 US-A-4,548,744 ;US-A-4,597,898 ;US-A- 4,877,896 ;US-A- 4,891 ,160 ;US-A- 4,976,879 ;US-A-5,415,807 ;GB-A-1,537,288 GB-A-1,498,520 DE-A-28 29022 ; andJP-A-06313271 - The modified ethoxylated polyamines (EPEI) are described above and are generally linear or branched poly (>2) amines. The amines may be primary, secondary or tertiary. A single or a number of amine functions are reacted with one or more alkylene oxide groups to form a polyalkylene oxide side chain. The alkylene oxide can be a homopolymer (for example ethylene oxide) or a random or block copolymer. The terminal group of the alkylene oxide side chain can be further reacted to give an anionic character to the molecule (for example to give carboxylic acid or sulphonic acid functionality).
- Preferably the composition according to the present invention comprises a dye transfer inhibition agent selected from polyvinylpyrridine N-oxide (PVNO), polyvinyl pyrrolidone (PVP), polyvinyl imidazole, N-vinylpyrrolidone and N-vinylimidazole copolymers (PVPVI), copolymers thereof, and mixtures thereof.
- The amount of dye transfer inhibition agent in the composition according to the present invention will be from 0.01 to 10 %, preferably from 0.02 to 8, or even to 5 %, more preferably from 0.03 to 6, or even to 2 %, by weight of the composition. It will be appreciated that the dye transfer inhibition agents will assist in the preservation of whiteness by preventing the migration of dyes from place to place. This preservation of whiteness assists in cleaning and counteracts the reduction in surfactants present in the wash liquor.
- Anti-redeposition polymers are typically polycarboxylate materials. Polycarboxylate materials, which can be prepared by polymerizing or copolymerizing suitable unsaturated monomers, are preferably admixed in their acid form. Unsaturated monomeric acids that can be polymerized to form suitable polycarboxylates include acrylic acid, maleic acid (or maleic anhydride), fumaric acid, itaconic acid, aconitic acid, mesaconic acid, citraconic acid and methylenemalonic acid. The presence in the polycarboxylates herein of monomeric segments, containing no carboxylate radicals such as vinylmethyl ether, styrene, ethylene, etc. is suitable provided that such segments do not constitute more than about 40% by weight of the polymer.
- Particularly suitable polycarboxylates can be derived from acrylic acid. Such acrylic acid-based polymers which are useful herein are the water-soluble salts of polymerized acrylic acid. The average molecular weight of such polymers in the acid form preferably ranges from about 2,000 to 10,000, more preferably from about 4,000 to 7,000 and most preferably from about 4,000 to 5,000. Water-soluble salts of such acrylic acid polymers can include, for example, the alkali metal, ammonium and substituted ammonium salts. Soluble polymers of this type are known materials. Use of polyacrylates of this type in detergent compositions has been disclosed, for example, in
Diehl, U.S. Pat. No. 3,308,067, issued Mar. 7, 1967 . In the present invention, the preferred polycarboxylate is sodium polyacrylate. - Acrylic/maleic-based copolymers may also be used as a preferred component of the anti-redeposition agent. Such materials include the water-soluble salts of copolymers of acrylic acid and maleic acid. The average molecular weight of such copolymers in the acid form preferably ranges from about 2,000 to 100,000, more preferably from about 5,000 to 75,000, most preferably from about 7,000 to 65,000. The ratio of acrylate to maleate segments in such copolymers will generally range from about 30:1 to about 1: 1, more preferably from about 10:1 to 2:1. Water-soluble salts of such acrylic acid/maleic acid copolymers can include, for example, the alkali metal, ammonium and substituted ammonium salts. Soluble acrylate/maleate copolymers of this type are known materials which are described in European Patent Application No.
66915, published Dec. 15, 1982 EP 193,360, published Sep. 3, 1986 EP 193,360 - Polyethylene glycol (PEG) can act as a clay soil removal-antiredeposition agent. Typical molecular weight ranges for these purposes range from about 500 to about 100,000, preferably from about 1,000 to about 50,000, more preferably from about 3,000 to about 10,000. Polyaspartate and polyglutamate dispersing agents may also be used.
- Any polymeric soil release agent known to those skilled in the art can optionally be employed in compositions according to the invention. Polymeric soil release agents are characterized by having both hydrophilic segments, to hydrophilize the surface of hydrophobic fibres, such as polyester and nylon, and hydrophobic segments, to deposit upon hydrophobic fibres and remain adhered thereto through completion of washing and rinsing cycles and, thus, serve as an anchor for the hydrophilic segments. This can enable stains occurring subsequent to treatment with the soil release agent to be more easily cleaned in later washing procedures.
- The amount of anti redeposition polymer in the composition according to the present invention will be from 0.01 to 10 %, preferably from 0.02 to 8 %, more preferably from 0.03 to 6 %, by weight of the composition.
- Generally the soil release polymers for polyester will comprise polymers of aromatic dicarboxylic acids and alkylene glycols (including polymers containing polyalkylene glycols).
- The polymeric soil release agents useful herein especially include those soil release agents having:
- (a) one or more nonionic hydrophilic components consisting essentially of:
- (i) polyoxyethylene segments with a degree of polymerization of at least 2, or
- (ii) oxypropylene or polyoxypropylene segments with a degree of polymerization of from 2 to 10, wherein said hydrophile segment does not encompass any oxypropylene unit unless it is bonded to adjacent moieties at each end by ether linkages, or
- (iii)a mixture of oxyalkylene units comprising oxyethylene and from 1 to about 30 oxypropylene units wherein said mixture contains a sufficient amount of oxyethylene units such that the hydrophile component has hydrophilicity great enough to increase the hydrophilicity of conventional polyester synthetic fiber surfaces upon deposit of the soil release agent on such surface, said hydrophile segments preferably comprising at least about 25% oxyethylene units and more preferably, especially for such components having about 20 to 30 oxypropylene units, at least about 50% oxyethylene units; or
- (b) one or more hydrophobe components comprising:
- (i) C3 oxyalkylene terephthalate segments, wherein, if said hydrophobe components also comprise oxyethylene terephthalate, the ratio of oxyethylene terephthalate:C3 oxyalkylene terephthalate units is about 2:1 or lower,
- (ii) C4 -C6 alkylene or oxy C4 -C6 alkylene segments, or mixtures therein,
- (iii)poly (vinyl ester) segments, preferably polyvinyl acetate), having a degree of polymerization of at least 2, or (iv) C1 -C4 alkyl ether or C4 hydroxyalkyl ether substituents, or mixtures therein, wherein said substituents are present in the form of C1 -C4 alkyl ether or C4 hydroxyalkyl ether cellulose derivatives, or mixtures therein, and such cellulose derivatives are amphiphilic, whereby they have a sufficient level of C1 -C4 alkyl ether and/or C4 hydroxyalkyl ether units to deposit upon conventional polyester synthetic fiber surfaces and retain a sufficient level of hydroxyls, once adhered to such conventional synthetic fiber surface, to increase fiber surface hydrophilicity, or a combination of (a) and (b).
- Typically, the polyoxyethylene segments of (a)(i) will have a degree of polymerization of from about 200, although higher levels can be used, preferably from 3 to about 150, more preferably from 6 to about 100. Suitable oxy C4 -C6 alkylene hydrophobe segments include, but are not limited to, end-caps of polymeric soil release agents such as MO3 S(CH2)n OCH2 CH2 O--, where M is sodium and n is an integer from 4-6, as disclosed in
U.S. Pat. No. 4,721,580, issued Jan. 26, 1988 to Gosselink . - Soil release agents characterized by poly(vinyl ester) hydrophobe segments include graft copolymers of poly(vinyl ester), e.g., C1 -C6 vinyl esters, preferably poly(vinyl acetate) grafted onto polyalkylene oxide backbones, such as polyethylene oxide backbones. See European Patent Application
0 219 048, published Apr. 22, 1987 by Kud, et al. Commercially available soil release agents of this kind include the SOKALAN type of material, e.g., SOKALAN HP-22, available from BASF (West Germany). - One type of preferred soil release agent is a copolymer having random blocks of ethylene terephthalate and polyethylene oxide (PEO) terephthalate. The molecular weight of this polymeric soil release agent is in the range of from about 25,000 to about 55,000. See
U.S. Pat. No. 3,959,230 to Hays, issued May 25, 1976 andU.S. Pat. No. 3,893,929 to Basadur issued Jul. 8, 1975 . - Another preferred polymeric soil release agent is a polyester with repeat units of ethylene terephthalate units contains 10-15% by weight of ethylene terephthalate units together with 90-80% by weight of polyoxyethylene terephthalate units, derived from a polyoxyethylene glycol of average molecular weight 300-5,000. Examples of this polymer include the commercially available material ZELCON 5126 (from DuPont) and MILEASE T (from ICI). See also
U.S. Pat. No. 4,702,857, issued Oct. 27, 1987 to Gosselink . - Another preferred polymeric soil release agent is a sulfonated product of a substantially linear ester oligomer comprised of an oligomeric ester backbone of terephthaloyl and oxyalkyleneoxy repeat units and terminal moieties covalently attached to the backbone. These soil release agents are described fully in
U.S. Pat. No. 4,968,451, issued Nov. 6, 1990 to J.J. Scheibel and E. P. Gosselink . Other suitable polymeric soil release agents include the terephthalate polyesters ofU.S. Pat. No. 4,711,730, issued Dec. 8, 1987 to Gosselink et al , the anionic end-capped oligomeric esters ofU.S. Pat. No. 4,721,580, issued Jan. 26, 1988 to Gosselink , and the block polyester oligomeric compounds ofU.S. Pat. No. 4,702,857, issued Oct. 27, 1987 to Gosselink . - Preferred polymeric soil release agents also include the soil release agents of
U.S. Pat. No. 4,877,896, issued Oct. 31, 1989 to Maldonado et al , which discloses anionic, especially sulfoarolyl, end-capped terephthalate esters. - Soil release agents will generally comprise from about 0.01% to about 10.0%, by weight, of the detergent composition, typically greater than or equal to 0.2 wt% even from 3 wt% to 9 wt%, but more preferably they are used at greater than 1 wt%, even greater than 2 wt% and most preferably greater than 3 wt%, even more preferably greater than 5 wt%, say 6 to 8 wt% in the composition.
- Still another preferred soil release agent is an oligomer with repeat units of terephthaloyl units, sulfoisoterephthaloyl units, oxyothyleneoxy and oxy-1,2-propylene units. The repeat units form the backbone of the oligomer and are preferably terminated with modified isethionate end-caps. A particularly preferred soil release agent of this type comprises about one sulfoisophthaloyl unit, 5 terephthaloyl units, oxyethyleneoxy and oxy-1,2-propyleneoxy units in a ratio of from about 1.7 to about 1.8, and two end-cap units of sodium 2-(2-hydroxyethoxy)-ethanesulfonate. Said soil release agent also comprises from about 0.5% to about 20%, by weight of the oligomer, of a crystalline-reducing stabilizer, preferably selected from the group consisting of xylene sulfonate, cumene sulfonate, toluene sulfonate, and mixtures thereof.
- Suitable soil release polymers are described in
WO 2008095626 (Clariant);WO 2006133867 (Clariant);WO 2006133868 (Clariant);WO 2005097959 (Clariant);WO 9858044 WO 2000004120 (Rhodia Chimie);US 6242404 (Rhodia Inc);WO 2001023515 (Rhodia Inc);WO 9941346 WO 9815346 WO 9741197 EP 728795 US 5008032 (BASF);WO 2002077063 (BASF);EP 483606 EP 442101 WO 9820092 (Proctor & Gamble EP 201124 (Proctor & Gamble EP 199403 (Proctor & Gamble DE 2527793 (Proctor & Gamble );WO 9919429 (Proctor & Gamble WO 9859030 (Proctor & Gamble US 5834412 (Proctor & Gamble );WO 9742285 (Proctor & Gamble WO 9703162 (Proctor & Gamble WO 9502030 (Proctor & Gamble WO 9502028 (Proctor & Gamble EP 357280 (Proctor & Gamble US 4116885 (Proctor & Gamble );WO 9532232 (Henkel WO 9532232 (Henkel WO 9616150 (Henkel WO 9518207 (Henkel EP 1099748 (Henkel );FR 2619393 DE 3411941 (Colgate Palmolive);DE 3410810 (Colgate Palmolive);WO 2002018474 (RWE-DEA MINERALOEL & CHEM AG; SASOL GERMANY GMBH);EP 743358 PL 148326 JP 2001181692 JP 11193397 A RO 114357 US 7119056 (Sasol). - Particularly preferred are combinations of relatively high levels of EPEI (>5wt% on the composition) with soil release polymers, especially, but not exclusively, if betaine is included in the surfactant system.
- We have determined that combination of EPEI and soil release polymers of the above types enables increased performance at lower surfactant levels compared to 1.0g/L or higher non soap surfactant wash liquors with betaine but without either EPEI or SRP. This effect is particularly visible on a range of stains on polyester, most particularly red clay. The effect of the combination on sunflower oil and foundation is also beneficial. SRP performance is enhanced significantly by repeated pre-treatment. There is some evidence of a build-up effect of EPEI performance.
- The most preferred soil release polymers are the water soluble/miscible or dispersible polyesters such as: linear polyesters sold under the Repel-O-Tex brand by Rhodia (gerol), lightly branched polyesters sold under the Texcare brand by Clariant, especially Texcare SRN170, and heavily branched polyesters such as those available from Sasol and described in
US 7119056 . - One or more enzymes may be present in a composition of the invention and when practicing a method of the invention.
- As noted above, suitable lipases include those of bacterial or fungal origin. Chemically modified or protein engineered mutants are included. Examples of useful lipases include lipases from Humicola (synonym Thermomyces), e.g. from H. lanuginosa (T. lanuginosus) as described in
EP 258 068 EP 305 216 WO 96/13580 EP 218 272 EP 331 376 GB 1,372,034 WO 95/06720 WO 96/27002 WO 96/12012 JP 64/744992 WO 91/16422 - Other examples are lipase variants such as those described in
WO 92/05249 WO 94/01541 EP 407 225 EP 260 105 WO 95/35381 WO 96/00292 WO 95/30744 WO 94/25578 WO 95/14783 WO 95/22615 WO 97/04079 WO 97/07202 - Preferred commercially available lipase enzymes include Lipolase™ and Lipolase Ultra™, Lipex™ and Lipoclean™ (Novozymes A/S).
- In addition to or as an alternative to lipase one or more other enzymes may be present. However lipase is particularly preferred.
- Advantageously, the presence of relatively high levels of calcium in the poorly built or unbuilt compositions of the invention has a beneficial effect on the turnover of certain enzymes, particularly lipase enzymes and preferably lipases from Humicola.
- The preferred lipases include first wash lipases which comprise a polypeptide having an amino acid sequence which has at least 90% sequence identity with the wild-type lipase derived from Humicola lanuginosa strain DSM 4109 and compared to said wild-type lipase, comprises a substitution of an electrically neutral or negatively charged amino acid within 15 A of E1 or Q249 with a positively charged amino acid; and may further comprise:
- (I) a peptide addition at the C-terminal;
- (II) a peptide addition at the N-terminal;
- (III)meets the following limitations:
- i. comprises a negatively charged amino acid in position E210 of said wild-type lipase;
- ii. comprises a negatively charged amino acid in the region corresponding to positions 90-101 of said wild-type lipase; and
- iii. comprises a neutral or negatively charged amino acid at a position corresponding to N94 of said wild-type lipase; and/or
- iv. has a negative charge or neutral charge in the region corresponding to positions 90-101 of said wild-type lipase; and
- (IV) mixture thereof.
- These are available under the Lipex™ brand from Novozymes. A similar enzyme from Novozymes but believed to fall outside of the above definition is sold by Novozymes under the name Lipoclean™ and this is also preferred.
- The method of the invention may be carried out in the presence of phospholipase classified as EC 3.1.1.4 and/or EC 3.1.1.32. As used herein, the term phospholipase is an enzyme which has activity towards phospholipids. Phospholipids, such as lecithin or phosphatidylcholine, consist of glycerol esterified with two fatty acids in an outer (sn-1) and the middle (sn-2) positions and esterified with phosphoric acid in the third position; the phosphoric acid, in turn, may be esterified to an amino-alcohol. Phospholipases are enzymes which participate in the hydrolysis of phospholipids. Several types of phospholipase activity can be distinguished, including phospholipases A1 and A2 which hydrolyze one fatty acyl group (in the sn-1 and sn-2 position, respectively) to form lysophospholipid; and lysophospholipase (or phospholipase B) which can hydrolyze the remaining fatty acyl group in lysophospholipid. Phospholipase C and phospholipase D (phosphodiesterases) release diacyl glycerol or phosphatidic acid respectively.
- Suitable proteases include those of animal, vegetable or microbial origin. Microbial origin is preferred. Chemically modified or protein engineered mutants are included. The protease may be a serine protease or a metallo protease, preferably an alkaline microbial protease or a trypsin-like protease. Preferred commercially available protease enzymes include Alcalase™, Savinase™, Primase™, Duralase™, Dyrazym™, Esperase™, Everlase™, Polarzyme™, and Kannase™, (Novozymes A/S), Maxatase™, Maxacal™, Maxapem™, Properase™, Purafect™, Purafect OxP™, FN2™, and FN3™ (Genencor International Inc.).
- The method of the invention may be carried out in the presence of cutinase. classified in EC 3.1.1.74. The cutinase used according to the invention may be of any origin. Preferably cutinases are of microbial origin, in particular of bacterial, of fungal or of yeast origin.
- Suitable amylases (alpha and/or beta) include those of bacterial or fungal origin. Chemically modified or protein engineered mutants are included. Amylases include, for example, alpha-amylases obtained from Bacillus, e.g. a special strain of B. licheniformis, described in more detail in
GB 1,296,839 WO 95/026397 WO 00/060060 - Suitable cellulases include those of bacterial or fungal origin. Chemically modified or protein engineered mutants are included. Suitable cellulases include cellulases from the genera Bacillus, Pseudomonas, Humicola, Fusarium, Thielavia, Acremonium, e.g. the fungal cellulases produced from Humicola insolens, Thielavia terrestris, Myceliophthora thermophila, and Fusarium oxysporum disclosed in
US 4,435,307 ,US 5,648,263 ,US 5,691,178 ,US 5,776,757 ,WO 89/09259 WO 96/029397 WO 98/012307 - Suitable peroxidases/oxidases include those of plant, bacterial or fungal origin. Chemically modified or protein engineered mutants are included. Examples of useful peroxidases include peroxidases from Coprinus, e.g. from C. cinereus, and variants thereof as those described in
WO 93/24618 WO 95/10602 WO 98/15257 - Pectate lyases (also called polygalacturonate lyases): Examples of pectate lyases include pectate lyases that have been cloned from different bacterial genera such as Erwinia, Pseudomonas, Klebsiella and Xanthomonas, as well as from Bacillus subtilis (Nasser et al. (1993) FEBS Letts. 335:319-326) and Bacillus sp. YA-14 (Kim et al. (1994) Biosci. Biotech. Biochem. 58:947-949). Purification of pectate lyases with maximum activity in the pH range of 8-10 produced by Bacillus pumilus (Dave and Vaughn (1971) J. Bacteriol. 108:166-174), B. polymyxa (Nagel and Vaughn (1961) Arch. Biochem. Biophys. 93:344-352), B. stearothermophilus (Karbassi and Vaughn (1980) Can. J. Microbiol. 26:377-384), Bacillus sp. (Hasegawa and Nagel (1966) J. Food Sci. 31:838-845) and Bacillus sp. RK9 (Kelly and Fogarty (1978) Can. J. Microbiol. 24:1164-1172) have also been described. Any of the above, as well as divalent cation-independent and/or thermostable pectate lyases, may be used in practicing the invention. In preferred embodiments, the pectate lyase comprises the pectate lyase disclosed in Heffron et al., (1995) Mol. Plant-Microbe Interact. 8: 331-334 and Henrissat et al., (1995) Plant Physiol. 107: 963-976. Specifically contemplated pectatel lyases are disclosed in
WO 99/27083 WO 99/27084 US patent no. 6,284,524 (which document is hereby incorporated by reference). Specifically contemplated pectate lyase variants are disclosed inWO 02/006442 WO 02/006442 - Examples of commercially available alkaline pectate lyases include BIOPREP™ and SCOURZYME™ L from Novozymes A/S, Denmark.
- Mannanase: Examples of mannanases (EC 3.2.1.78) include mannanases of bacterial and fungal origin. In a specific embodiment the mannanase is derived from a strain of the filamentous fungus genus Aspergillus, preferably Aspergillus niger or Aspergillus aculeatus (
WO 94/25576 WO 93/24622 JP-A-03047076 JP-A-63056289 JP-A-63036775 JP-A-08051975 WO 97/11164 WO 91/18974 WO 99/64619 WO 99/64619 - Examples of commercially available mannanases include Mannaway™ available from Novozymes A/S Denmark. The enzyme and any perfume/fragrance or pro-fragrance present may show some interaction and should be chosen such that this interaction is not negative. Some negative interactions may be avoided by encapsulation of one or other of enzyme and pro-fragrance and/or other segregation within the product.
- Any enzyme present in the composition may be stabilized using conventional stabilizing agents, e.g., a polyol such as propylene glycol or glycerol, a sugar or sugar alcohol, lactic acid, boric acid, or a boric acid derivative, e.g., an aromatic borate ester, or a phenyl boronic acid derivative such as 4-formylphenyl boronic acid, and the composition may be formulated as described in e.g.
WO 92/19709 WO 92/19708 - Detergent compositions according to the invention may comprise a bleach system.
- The present invention may be used in a formulation that is used to bleach via air, or an air bleach catalyst system. Suitable complexes and organic molecule (ligand) precursors for forming complexes are available to the skilled worker, for example, from:
WO 98/39098 WO 98/39406 WO 97/48787 WO 00/29537 WO 00/52124 WO00/60045 WO02/48301 - Photobleaches may also be employed. In the context of the present invention a "photobleach" is any chemical species that forms a reactive bleaching species on exposure to sunlight, and preferably is not permanently consumed in the reaction. Preferred photo-bleaches include singlet oxygen photo-bleaches and radical photo-bleaches. Suitable singlet oxygen photo-bleaches may be selected from, water soluble phthalocyanine compounds, particularly metallated phthalocyanine compounds where the metal is Zn or Al-Z1 where Z1 is a halide, sulphate, nitrate, carboxylate, alkanolate or hydroxyl ion. Preferably the phthalocyanin has 1-4 SO3X groups covalently bonded to it where X is an alkali metal or ammonium ion. Such compounds are described in
WO2005/014769 (Ciba). - When present, the bleach catalyst is typically incorporated at a level of about 0.0001 to about 10wt%, preferably about 0.001 to about 5wt%.
- Given that the method of the present invention preferably used very low levels of product dosage, it is advantageous to ensure that perfume is employed efficiently.
- A particularly preferred way of ensuring that perfume is employed efficiently is to use an encapsulated perfume. Use of a perfume that is encapsulated reduces the amount of perfume vapour that is produced by the composition before it is diluted. This is important when the perfume concentration is increased to allow the amount of perfume per wash to be kept at a reasonably high level.
- It is even more preferable that the perfume is not only encapsulated but also that the encapsulated perfume is provided with a deposition aid to increase the efficiency of perfume deposition and retention on fabrics. The deposition aid is preferably attached to the encapsulate by means of a covalent bond, entanglement or strong adsorption, preferably by a covalent bond or entanglement.
- Both for the efficient deposition of perfume, e.g. encapsulated perfume, and for the deposition of other benefit agents, such as silicone it is desirable to use a deposition aid in the composition. An especially preferred class of deposition aids includes those which are substantive to cellulose.
- In one preferred embodiment, the deposition aid is a polysaccharide. In preferred embodiments the polysaccharide is a ß-1,4-linked backbone and is substantive to cellulose. Preferably the polysaccharide is a cellulose, a cellulose derivative, or another ß-1,4-linked polysaccharide having an affinity for cellulose, such as polymannan, polyglucan, polyglucomannan, polyxyloglucan and polygalactomannan or a mixture thereof. More preferably, the polysaccharide is selected from the group consisting of polyxyloglucan and polygalactomannan. Particularly preferred polysaccharides are locust bean gum, tamarind xyloglucan, guar gum or mixtures thereof. Most preferably, the deposition aid is locust bean gum.
- Cationic polymer can also be used as deposition aids. Examples of such cationic polymers used as coatings are cationically modified starch and cationically modified guar, polymers comprising poly diallyl dimethyl ammonium halides (PolyDADMAC), and copolymers of DADMAC with vinyl pyrrolidone, acrylamides, imidazoles, imidazolinium halides, and the like. For instance, Polyquaternium-6, 7, 22 and 39, all available from Ondeo Nalco. Cationic polysaccharides are preferred. Particularly preferred cationic starches have a molecular weight of from about 100,000 to about 500,000,000, preferably from about 200,000 to about 10,000,000 and most preferably from about 250,000 to about 5,000,000. Particularly preferred cationic starch products are HI-CAT CWS42 and HI-CAT 02 and are commercially available from ROQUETTE AMERICA, Inc. Preferred cationic guars have a molecular weight of from about 50,000 to about 0.5,000,000. Suitable cationic polymeric deposition aids include cationic guar polymers such as Jaguar (ex Rhone Poulenc), cationic cellulose derivatives such as Celquats (ex National Starch), Flocaid (ex National Starch), cationic potato starch such as SoftGel (ex Aralose), cationic polyacrylamides such as PCG (ex Allied Colloids). The preferred cationic guars are Jaguar C-162 and Jaguar C-17 and are commercially available from Rhodia Inc.
- Alternative preferred deposition aids are those which are substantive to polyester. Preferably, the polyester-substantive deposition aid is a polymer derivable from dicarboxylic acids and polyols, particularly a phthalate containing polymer, more preferably a polymer comprising units derived from (poly)ethylene glycol and terephthalate. Most preferably the polymer is a selected from the group comprising PET/POET, PEG/POET, PET/PEG and phthalate/glycerol/ethylene glycol polymers. Materials of this type are widely available to the laundry formulator as they are commonly used as soil-release polymers (as discussed above). Given the more efficient deposition of certain benefit ingredients from the compositions of the present invention it is possible to deliver more expensive benefit agents than would otherwise be economic, these can include materials having a benefit other than a pleasant odour, such as an aromatherapeutic benefit.
- The compositions of the invention may contain one or more other ingredients. Such ingredients include viscosity modifiers, preservatives (e.g. bactericides), pH buffering agents, hydrotropes, polyelectrolytes, anti-shrinking agents, anti-wrinkle agents, anti-oxidants, sunscreens, anti-corrosion agents, drape imparting agents, anti-static agents and ironing aids. The products of the invention can contain pearlisers and/or opacifiers.
- The detergent compositions herein may also optionally contain relatively low levels of organic detergent builder material. Examples include the alkali metal, citrates, succinates, malonates, carboxymethyl succinates, carboxylates, polycarboxylates and polyacetyl carboxylates. Specific examples include sodium, potassium and lithium salts of oxydisuccinic acid, mellitic acid, benzene polycarboxylic acids, C10-C22 fatty acids and citric acid. Other examples are DEQUEST™, organic phosphonate type sequestering agents sold by Monsanto and alkahehydroxy phosphonates. Citrate salts and C12-C18 fatty acid soaps are highly preferred.
- Other suitable organic builders include the higher molecular weight polymers and copolymers known to have builder properties. For example, such materials include appropriate polyacrylic acid, polymaleic acid, and polyacrylic/polymaleic acid copolymers and their salts, such as those sold by BASF under the name SOKALAN™.
- If utilized, the organic builder materials may comprise from about 0.5% to 20 wt%, preferably from 1 wt% to 10 wt%, of the composition. The preferred builder level (other than soaps) is less and 10 wt% and preferably less than 5 wt% of the composition. Given that the surfactants of the invention are preferably selected to be calcium tolerant, overall builder levels of less than 10 wt% (including any soaps) are preferred, as this not only reduces the quantity of product required per wash but also maintains a level of calcium which assists in the activity of certain enzymes. Such low builder (or zero builder) levels are also useful when pre-softened water is used for the dilution step.
- Two ingredients that are very much preferred to be present in compositions according to the invention are buffers and hydrotropes.
- The presence of some buffer is preferred for the Lipase performance (or at least pH control), because it is desirable for alkaline pH to be maintained and if the lipase hydrolyses fatty soils to fatty acids then it can be expected for the pH to drop unless buffer is present. Preferred buffers are borax, MEA, and TEA. They are used in the composition at levels of from 5 to 15 wt%.
- Preferred liquids will comprise some hydrotrope, although the minimum amount consistent with the need for concentration should be used. Suitable hydrotropes include MPG (monopropylene glycol). This and/or other conventionally employed hydrotropes may be used in the composition at levels of from 2 to 10 wt%.
- The surfactant blends listed in Table 1a were prepared at a concentration of 0.7 g/l in water containing sufficient Calcium ions to give a French Hardness of 40 degrees. Following the method disclosed in
EP1771543 other electrolytes such as sodium chloride, sodium sulphate, sodium hydroxide were added as necessary to adjust the ionic strength to 0.5M and the pH to 10. The absorption of light of wavelength 540nm through 4mm of sample was measured 15 minutes after sample preparation. Ten measurements are made and an average value is calculated. Samples that give an absorption value of less than 0.08 are deemed to be calcium tolerant.Table 1a Sample Ratio Adsorbance Pass / Fail LAS 100 0.267 Fail LAS / AE-7EO 90 / 10 0.218 Fail LAS / AE-7EO 60 / 40 0.044 Pass LAS / AE-30EO 90 / 10 0.061 Pass LAS / AE-30EO 60 / 40 0.038 Pass LAS / APG 80 / 20 0.474 Fail LAS / AES-1EO 90 / 10 0.140 Fail LAS / AES-3EO 90 / 10 0.072 Pass APG 100 0.056 Pass AES-3EO 100 0.048 Pass AE-7EO 100 0.045 Pass LAS / Sulphobetaine 95 / 5 0.033 Pass Table 1b: materials listed in Table 1a Material Grade Supplier LAS NANSA HS90PF Huntsman AE-7EO Neodol 25-7 Shell AE-30EO Lutensol AO30 BASF APG Glucopon 50G Cognis Sulfobetaine Ralufon DCH Raschig AES-3EO Empicol ESC 70 Huntsman AES-1EO Empicol ESA 70 Huntsman - From the results it can be seen that pure LAS is insufficiently calcium tolerant, whereas pure alkyl poly glucoside (APG), the alkyl ether sulphate (AES-3EO) and the alcohol ethoxylate (AE-7EO) were calcium tolerant. The addition of zwitterionic (sulphobetaine), AE-7EO or AE-30EO rendered the LAS based surfactant systems calcium tolerant, although more of the 7EO material needed to be added than the 30EO material.
- Each of the examples detailed in Table 2a and 2b was used to wash a range of stained and soiled fabrics, which had been attached to a piece of ballast fabric. Apart from the control each of the compositions had the same non-soap surfactant level. All of the compositions and the control comprised the ingredients listed in Table 2a with the differences between the examples being as indicated in Table 2b.
- The washes were conducted in a European Miele washing machine using its standard 40°C cotton wash cycle. The main wash intake was 15 1 of ambient temperature water of 26°FH water (Ca:Mg 3:1) and the total wash time (including rinses) was 1hour 56 mins. A mixed ballast load of 3kg (40% woven polycotton, 30% woven cotton, 30% knitted cotton) was also included in each cycle to better mimic real wash use conditions. Examples 2 to 5 were dosed at a total product volume of 20 ml/wash, whilst the control used was (Persil "Small and Mighty" ™) it was dosed at 35 ml/wash, as per manufacturer's recommendation. Its already higher composition level of non-soap surfactant coupled with this higher dosing volume accounts for the large difference in non-soap surfactant concentration in the wash liquors of the examples versus the control. Apart from the surfactant levels and the other ingredient differences specified in table 2b the control wash liquor made by dilution of the 35 ml aliquot of Persil Small and Mighty™ would have had the same levels of ingredients from table 2a as the wash liquors that would have been made by dilution of 20 ml aliquots of examples 2 to 5. The 20 ml example doses weighed 21 g; The 35 ml control example dose weighed 37 g.
Table 2a Fixed compositions (parts active): Material Function Source Level Glycerol Solvent Univar 3.17 MPG Hydrotrope Dow 5.7 NaOH 2.13 TEA Buffer Univar 2.05 Neodol 25-7 Alcohol ethoxylate non-soap surfactant Surfachem 12.74 F-Dye Fluorescer 0.18 Citric Acid Builder 1.71 LAS (as LAS Acid) Non-soap surfactant precursor Lever Faberge 8.49 Fatty acid Soap surfactant precursor Uniqema 3.03 SLES Non-soap surfactant Lever Faberge 4.24 Dequest 2066 Sequestrant Thermophos 0.875 Patent Blue Colouring Sensient 0.00036 Acid Yellow Colouring Sensient 0.00005 Opacifier Rohm Haas 0.0512 Perfume Fragrance IFF 0.734 Savinase Enzyme Novozymes 2.362 Stainzyme Enzyme Novozymes 0.945 Table 2a variable compositions (parts active): Ex. 2 Ex. 3 Ex. 4 Ex.5 EPEI 5.5 5.5 5.5 9 Lipex 3 3 3 3 Texcare SRN170 0 7.5 0 0 Sokolan CP5 0 0 20 0 Borax 10 10 10 10 Empigen BB 1.5 1.5 1.5 1.5 TOTAL Non-Soap Surfactant 26.345 26.345 26.345 26.345 Ingredient Information Supplier Borax Buffer Si gma EPEI Polymer EPEI 20EO: polyethyleneimine having a weight average molecular weight of about 600 and wherein the polyethyleneimine has been modified by alkoxylation with on average 20 ethylene oxide moieties Nippon Shokubai Lipex Lipase enzyme including stabilization system. Active lipase protein level is 100 000 LU/g Novozymes Texcare SRN170 Soil release polymer Clariant Sokolan CP5 Soil release polymer BASF Empigen BB Non-soap surfactant (Betaine) Huntsman Notes on ingredients in table 2b - The performance of the compositions of Examples 2 to 5 were determined to be as follows:
- for some stains and soils, equivalent performance was obtained to that of the control (35 ml dose).
- surprisingly, for other stains and soils, a selection shown in Table 3, enhanced performance was achieved despite the amount of product dosed and overall in-wash surfactant level being much reduced compared to that of the control.
- In order to assess the shading dye delivery from compositions within the scope of the invention, six formulations were compared. These are given in Table 4
- Examples of a conventional concentrated detergent liquid with and without shading dye (A and B) are compared to formulations 6-9 which are all embodiments of the invention.
Table 4 % of composition A B 6 7 8 9 LAS (as LAS Acid) 13.4 13.4 8.49 8.49 8.49 8.49 Neodol 25-7 20.11 20.11 12.74 12.74 12.74 12.74 Fatty acid 4.78 3.03 3.03 3.03 3.03 3.03 SLES 6.7 6.7 4.24 4.24 4.24 4.24 PEI(600)20EO 0 0 0 0 5.5 5.5 Direct Violet 9 0 0.02 0 0.035 0 0.035 Water and buffer* Balance to 100% *sufficient 5mM Tris buffer to give a diluted pH of 8 - Appropriate dosages of the formulations were added to each terg-o-tometer pot to deliver the ingredient levels given in table 5, The pots contained each contained 980 ml water with sufficient hardness ions to achieve a water hardness of 6°FH (Ca:Mg = 2:1).
Table 5 Delivered ingredient levels (in g/l) A B 6 7 8 9 Surfactant 1.1 1.1 0.4 0.4 0.4 0.4 Direct Violet 9 0 0.000466 0 0.000466 0 0.000466 PEI(600)20EO 0 0 0 0 0.073 0.073 - Sufficient pieces of cotton interlock (7.5cm x 7.5cm) were added to each pot to achieve a liquor to cloth ratio of 30:1. The experiment was run at 25°C.
- After washing and drying, the reflectance of samples of the cotton interlock pieces were determined using a reflectometer. These results are shown in Table 6 and are expressed in terms of a L* (Lightness) value (as defined by the CIE 1976 (L*, a*, b*) color space).
Table 6 Formulation Significance* L* A X 95.5 8 X 95.4 6 X 95.4 B Y 90.9 7 Z 90.6 9 Z 90.6 *formulations joined by the same letter show no significant difference at the 95% confidence level. - In all cases addition of shading dye causes a reduction in Lightness value. The reduction is significantly greater for embodiments of the current invention, i.e. formulations 7 and 9. It can therefore be concluded that there is better deposition of shading dye when it is used according to the invention.
- Surfactant compositions shown in table 7 were tested in a Linitest with and without either betaine or EPEI (PEI600 20EO) and using the method described below.
Table 7 (all values expressed as wt %) Base Base + Betaine NaLAS 34.0 30.3 Prifac 5908 10.6 9.5 Neodol 25-7 40.4 40.4 SLES 3EO 14.9 13.2 Empigen BB (betaine) 0 6.6 - The Linitest pots were filled with 6°FH water (2:1 Ca2+:Mg2+) and then the required surfactant and polymer solutions such that the final wash liquor volume was 100ml. Using either 0.1M NaOH or 0.1M HCl the wash liquor pH was adjusted to 7. To each Lintiest pot 2 woven cotton and 2 knitted polyester yellow pottery clay stains plus 4 ballast cloths (2 cotton and 2 knitted polyester) were then added with liquor to cloth ratios of 8:1. Finally, fifty metal ball bearings were added before closing the Linitest pot and washing the cloths for 15 minutes at 25°C and 100rpm.
- After the wash was completed the ball bearing were removed, the cloths were squeezed to remove excess liquor and then rinsed within the Linitest pot twice for 3 minutes (at 100rpm) in two portions of 200ml 6°FH water. Finally the cloths were wrung out and allowed to dry on racks at room temperature.
- The colour of the stains was measured both before and after washing on a Hunter lab reflectometer and expressed in terms of the difference between the stain and clean cloth giving ΔE*before wash or ΔE*after wash values respectively. The ΔE values are colour differences defined as the Euclidian distance between the stain and clean cloth in L*a*b* colour space.
- At 1g/L non-soap surfactant, yellow pottery clay from knitted polyester.
SRI ΔE Eg C Base 88.8 11.2 Eg D Base+ 50ppm EPEI 91.2 8.8 Eg E Base + betaine 90.6 9.4 Eg F Base + betaine + 50ppm EPEI 96.5 3.5 - At 0.5g/L non-soap surfactant, yellow pottery clay from knitted polyester
SRI E Eg 10 Base 88.1 11.9 Eg 11 Base + 25ppm EPEI 91.6 8.4 Eg 12 Base + betaine 88.0 12.0 Eg 13 Base + betaine + 25ppm EPEI 92.3 7.7 - Two effects can be seen from these tests.
- First it can be seen that at the lower non-soap surfactant levels the effect of the EPEI is greater. In fact half the amount gives a larger effect on ΔE (Eg 10, 11.9 to Eg 11, 8.4 versus Comparative Eg C, 11.2 to Comparative Eg D, 8.8).
- Second it can be seen that the further boost is obtained with a combination of betaine and EPEI, especially at low non-soap surfactant levels. At the high non-soap surfactant levels the addition of betaine has an effect on its own (11.2 to 9.4) whereas at the lower in wash non-soap surfactant levels there is no discernable effect from adding the betaine and only when the EPEI is also added in Eg 13 does the ΔE further improve.
- Thus addition of EPEI is more effective at lower in wash non-soap surfactant levels for this type of soil and EPEI is even more effective at low non-soap surfactant concentrations if it is used with betaine as part of the surfactant system.
- For these examples the composition used was as detailed below. No other ingredients were used.
19.11% NI, 7EO 12.73% LAS acid 6.37% SLES 4.54% Fatty acid 2.25% Betaine - Test pieces were subjected to a 15 minute wash in linitest with a liquor to cloth ratio of 8:1 at a temperature of 25°C. The water hardness used was 6°FH (2:1 Ca:Mg). The wash was followed by two 3 minute rinses in the linitest. Key Marker stain for EPEI performance is Red Pottery clay on knitted polyester.
- G - control, 1.2g/l non-soap surfactant
- 14 - 0.24g/l non-soap surfactant
- 15 - 0.4g/l non-soap surfactant
- 16 - 0.24g/l non-soap surfactant + 0.067g/l EPEI
- 17- 0.4g/l non-soap surfactant + 0.067g/l EPEI
- At the 95% Confidence level there is a significant benefit of removal of red pottery clay from addition of EPEI over surfactant alone. This shows the boost to the performance of the low surfactant formulation versus the control by adding EPEI.
- Further examples were carried out following the same protocol as first set.
- Key:
- H- control, 1.2g/l non-soap surfactant
- 18 - 0.33g/l non-soap surfactant
- 19 - 0.33g/l non-soap surfactant + 0.11 g/l EPEI
- 20 - 0.33g/l non-soap surfactant + 0.17 g/l EPEI
- This confirms that at the 95% Confidence level there is a significant benefit in increased reflectance die to removal of red pottery clay for addition of EPEI over surfactant alone at the low in wash non-soap surfactant levels.
- The aim of these examples was to determine the effect of replacing lipex with Texcare SRN170 soil release polymer on primary detergency of knitted cotton. It is known that knitted cotton is more responsive to liquid detergents than woven cotton. As well as this, the performance of lipolase, a multiwash lipase, was tested as an alternative to lipex, which is a single wash lipase. Also formulations combining EPEI, lipase and SRP. All formulations except the 35 ml control, contained carbobetaine and EPEI at 1.5% and 5.5% respectively. All formulations except the control 35 ml formulation were buffered and so had an in-wash pH of around 8.5.
- The wash conditions used were European FLA Washing Machines with normal 40°C Cotton Wash Cycle. 3kg of mixed standard ballast was included in the 15 Litre fill. The monitors comprised stains on knitted cotton and knitted polyester, together with Lard on blue knitted cotton.
Table 10 Eg 21 30% active + Lipex Eg 22 30% active + EPEI+Lipex Eg 23 30% active + EPEI + lipolase Eg 24 30% active + EPEI + SRP Eg 25 30% active + EPEI+Lipex+ SRP Eg 26 30% active + EPEI + lipolase +SRP Glycerol 3.17 3.17 3.17 3.17 3.17 3.17 MPG 5.7 5.7 5.7 5.7 5.7 5.7 NaOH 2.13 2.13 2.13 2.13 2.13 2.13 TEA 2.05 2.05 2.05 2.05 2.05 2.05 Neodol 7EO 12.74 12.74 12.74 12.74 12.74 12.74 F dye 0.18 0.18 0.18 0.18 0.18 0.18 Citric acid 1.71 1.71 1.71 1.71 1.71 1.71 LAS 8.49 8.49 8.49 8.49 8.49 8.49 Fatty acid 3.03 3.03 3.03 3.03 3.03 3.03 Betaine 1.5 1.5 1.5 1.5 1.5 1.5 SLES 4.24 4.24 4.24 4.24 4.24 4.24 Dequest 2066 0.875 0.875 0.875 0.875 0.875 0.875 Opacifier 0.0512 0.0512 0.0512 0.0512 0.0512 0.0512 Perfume 0.734 0.734 0.734 0.734 0.734 0.734 Savinase 2.262 2.262 2.262 2.262 2.262 2.262 Stainzyme 0.945 0.945 0.945 0.945 0.945 0.945 EPEI# 5.5 5.5 5.5 5.5 5.5 5.5 Lipex 0 3 0 0 3 0 Borax 10 10 10 10 10 10 Lipolase 0 0 3 0 0 3 SRP* 0 0 0 3.75 3.75 0 *Texcare SRN 170 (ex Clariant)
# EPEI = PEI(600) 20EO as used in examples 2-5
SLES and betaine are also as used in examples 2 to 5. - The formulations in examples 21 to 26 were tested against a control formulation without carbobetaine or EPEI or any Soil release polymer or lipase, as was done in examples 1 to 5 versus control A. The control used was Persil Small and Mighty™ which was dosed to 1.1 g/l non-soap surfactant from a 35 ml dose equivalent.
Table 11 Knitted cotton performance against control Class Stain 21 22 23 24 25 26 particulate Georgia clay Same Same Better Same Same Same Fatty lard Same Better Better Same Better Better enzymatic grass Same Better Same Same Same Better Food sauces Ragu Same Same Same Same Same Better - Surprisingly addition of lipolase (Eg 23) shows an improved removal of Georgia clay when compared to the control, whereas lipex (Eg 22) does not. Replacement of enzyme with soil release polymer SRN170 (Eg 24) usefully gives the same performance as the control. Combination of the technologies in Eg 26 performs better than enzyme alone Eg 21 but against Eg 23 for effect of adding the SRP there is a surprising win on the key everyday enzymatic stain "grass" at these low non-soap surfactant levels in the wash.
Table 12 Knitted polyester performance against control Class Stain 21 22 23 Particulate Garden soil Better Better Better Particulate Georgia clay Same Better Better Particulate Red clay Same Better Better Particulate Yellow clay Better Better Better Fatty Lard Same Same Same Fatty Cooking oil Worse Better Same Enzymatic Grass Same Better Same Bleachable blackcurrent Same Better Better Bleachable Red wine Better Better Better Oils and greases Mascara Better Better Same Food sauces Ragu Same Better Same Class Stain 24 25 26 Particulate Garden soil Better Better Better Particulate Georgia clay Better Better Better Particulate Red clay Same Same Same Particulate Yellow clay Better Better Better Fatty Lard Same Same Same Fatty Cooking oil Better Better Same Enzymatic Grass Same Same Better Bleachable blackcurrent Better Better Same Bleachable Red wine Better Better Better Oils and greases Mascara Same Same Better Food sauces Ragu Better Better Better - Especially for example 26 further boosts in performance were seen on multi-washing. This is thought to be due to the enhanced deposition of the soil release polymer.
- To further understand if the results were due to the presence of SRP the tests were repeated using the same 30 wt% surfactant base as the control comparison (base). These examples (27 to 31 - see table 13) are summarized in the comparative performance tables below (tables 14 and 15). Both the Lipex and the Lipolase had the same enzyme activity of 100,000 LU/g.
Table 13 Eg 27 30% active + EPEI+Lipex Eg 28 30% active + EPEI + lipolase Eg 29 30% active + EPEI + SRP Eg 30 30% active + EPEI+Lipex+ SRP Eg 31 30% active + EPEI + lipolase +SRP Table 14 Knitted cotton vs base Class Stain 27 28 29 30 31 Particulate Garden soil Same Same Same Better Same Particulate Georgia clay Same Better Same Same Same Particulate Red clay Same Same Same Same Better Fatty Lard Better Better Same Better Better Fatty Make up 1 Same Same Same Same Better Bleachable Tea Better Same Same Better Better Emzymatic Choc ice cream Better Same Same Better Same Food sauces Ragu Better Better Same Better Better Table 15 Knitted polyester vs base Class Stain 27 28 29 30 31 particulate Garden soil Same Same Same Better Better particulate Georgia clay Same Same Same Same Same particulate Red clay Same Same Same Same Same particulate Yellow clay Better Better Same Better Better Fatty lipstick Same Same Better Better Better Fatty Cooking oil Better Better Better Better Better enzymatic Choc ice cream Better Same Same Same Same enzymatic Grass Same Same Same Same Better Food sauces Annato oil Better Same Better Same Better Oils and greases Mascara Better Better Better Better Better Food sauces Ragu Better Same Better Better Better - Of particular note is that addition of both enzymes (Lipex and Lipolase) shows a significant win over base on lard stains on knitted cotton. Overall better performance from the Lipex than lipolase.
- For the knitted polyester addition of lipex produces significant wins over base on particulate, fatty and food sauce stains. Addition of lipolase shows surprisingly improved first wash performance on the particulate and fatty stains, as seen with lipex, which is sold as a first wash lipase enzyme.
- Addition of SRN170 soil release polymer gives significant wins on fatty, fatty/particulate and food sauce stains.
- A combination of enzyme and SRN170 shows significant increase in performance of all stain groups, except bleachable.
- A liquid detergent composition comprising surfactant including betaine, EPEI at more than 5 wt%, and Lipase enzyme was made up into a wash solution for testing and buffered to pH9 (full composition details are given in table 16). The amount used was equivalent to a 20 ml dose to a front loading automatic washing machine. Cotton terry test pieces and various amounts of LBG-silicone were added into the wash liquor. And the swatches were subjected to Linitest washes at 40°C for a 45 minute main wash, followed by 2x10 min rinses, and, line drying. Softness of the test pieces was assessed by two trained panellists.
Table 16 Softening Compositions Ingredient %wt Neodol 25-7 12.74 LAS acid 8.49 SLES 3EO 4.24 Carbobetaine 1.5 Fatty acid Prifac 5908 3.03 EPEI 5.5 Lipex 3 Savinase 2.36 Eg 32 Wash liquor alone Least soft Eg 33 +0.88% LBG-Sil* Eg 34 +1.75% LBG-Sil* Eg 35 +3.5% LBG-Sil Eg 36 +13.13% LBG-Sil Most soft *No perceivable difference between these. - LBG-Silicone gives perceivable softening from this liquid detergent composition. There is no appreciable difference in softening below 3.5 wt% LBG silicone. Above that, the amount of softening perceived increased with increasing levels of LBG silicone. LBG is thus shown to act as a very effective deposition aid for the silicone softening benefit agent in the compositions used according to the invention.
the dye is substituted with at least one SO3 - or -COO- group; the B ring does not carry a negatively charged group or salt thereof;
and the A ring may further substituted to form a naphthyl; the dye is optionally substituted by groups selected from: amine, methyl, ethyl, hydroxyl, methoxy, ethoxy, phenoxy, Cl, Br, I, F, and NO2.
Performance Relative to Control* | ||||
Stain or soil | Ex.2 | Ex.3 | Ex.4 | Ex.5 |
Red pottery clay on polyester | Better | Better | Better | Better |
Yellow pottery clay on polyester | Better | Better | Better | Same |
Blood on Cotton | Better | - | Better | Same |
Dirty Motor Oil on polyester | Better | Better | Better | Same |
Lard (Dyed) on polyester | Same | Same | Same | Same |
*Under equivalent wash conditions, in wash non-soap surfactant level for Control = 1.02 g/l |
17 | X | 77.4 | ||
16 | X | Y | 75.5 | |
G | X | Y | Z | 73.8 |
15 | Y | Z | 72.3 | |
14 | Z | 71.2 |
20 | X | 88.4 | |
19 | X | 85.9 | |
H | Y | 75.0 | |
18 | Y | 72.0 |
Increased reflectance due to removal. |
Claims (14)
- A method of laundering fabric which comprises the steps of:a) providing a pourable liquid detergent composition comprising ethoxylated polyethyleneimine, soil relaese polymer, 10-40% wt of surfactant, essentially consisting of nonionic and/or anionic and/or zwitterionic surfactant, which 10-40% wt of surfactant preferably passes the Calcium Tolerance Test described herein, and in addition, no more than 15% wt, preferably no more than 10%wt, of a soap, with the proviso that any soap present is present as a minority in wt% terms of the total surfactant, wherein the ratio of non-soap surfactant to ethoxylated polyethyleneimine is from 2:1 to 7:1,b) diluting a dose of said detergent composition in water by a factor of greater than 500 to obtain a wash liquor which comprises 0.8 to 0.035 g/1 of non-soap surfactant, and,c) washing fabrics with the wash liquor so formed.
- A method of laundering fabric which comprises the steps of:a) providing a multidose container which contains a pourable liquid detergent composition comprising ethoxylated polyethyleneimine, soil release polymer, 10-40% wt of surfactant, essentially consisting of nonionic and/or anionic and/or zwitterionic surfactant, and in addition, no more than 15% wt, preferably no more than 10%wt, of a soap, with the proviso that any soap present is present as a minority in wt% terms of the total surfactant,b) mixing a dose of the detergent composition comprising 4 to 8 g non-soap surfactant, at least 0.5 g of soil release polymer and at least 0.5 g of the ethoxylated polyethyleneimine, with water to obtain a wash liquor, wherein the ratio of non-soap surfactant to ethoxylated polyethyleneimine is from 2:1 to 7:1, andc) washing fabrics with the wash liquor so formed.
- A method according to claim 2 wherein the dose comprises at least 0.01 g active lipase protein.
- A method according to any preceding claim wherein the composition comprises 5 to 20000 LU/g lipase.
- A method according to any preceding claim wherein the composition comprises ethoxylated polyethyleneimine, at a level of 0.01 to 25 wt%, preferably more than 3 and/or less than 9.5 wt% of the composition, most preferably 4 to 9 wt% of the composition.
- A method according to any preceding claim wherein the composition comprises a soil release polymer, at a level preferably at a level from 3 wt% to 9.0 wt%, preferably from 6 wt% to 8.0 wt% of the composition.
- A method according to any preceding claim wherein the 10 to 40% wt of non-soap surfactant in the composition comprises less than 90 %wt LAS and at least 10 %wt nonionic surfactant.
- A method according to any preceding claim wherein the composition comprises a shading dye, comprising blue violet dye, preferably with an optical adsorption peak in the range 540 to 600nm, preferably a bis-azo direct dye, preferably at a level of 0.000001 to 1 wt% of the composition.
- A method according to any preceding claim wherein the composition comprises a fluorescer, preferably at a level of 0.005 to 2 wt% of the composition.
- A method according to any preceding claim wherein the composition comprises a dye transfer inhibition polymer, preferably at a level of 0.01 to 10 wt%, more preferably from 0.02 to 8 wt%, most preferably from 0.03 to 6 wt% of the composition .
- A method according to any preceding claim wherein the composition comprises a polycarboxylate anti- redeposition agent, preferably at a level of 0.01 to 10 wt%, more preferably from 0.02 to 8 wt%, most preferably from 0.03 to 6 wt% of the composition.
- A method according to any preceding claim wherein the composition comprises a first wash lipase which comprises a polypeptide having an amino acid sequence which has at least 90% sequence identity with the wild- type lipase derived from Humicola lanuginosa strain DSM 4109 and compared to said wild-type lipase, comprises a substitution of an electrically neutral or negatively charged amino acid within 15 A of EI or Q249 with a positively charged amino acid; and may further:a) comprise a peptide addition at the C-terminal, and/or,b) comprise a peptide addition at the N-terminal and/or;c) meet the following limitations:i) it comprises a negatively charged amino acid in position E210 of said wild-type lipase;ii) it comprises a negatively charged amino acid in the region corresponding to positions 90-101 of said wild-type lipase; and iii) it comprises a neutral or negatively charged amino acid at a position corresponding to N94 of said wild-type lipase; and/oriii) it has a negative charge or neutral charge in the region corresponding to positions 90-101 of said wild-type lipase.
- A method according to any preceding claim wherein the composition comprises a deposition aid wherein the deposition aid is a polysaccharide, more preferably a [beta]-1,4-linked polysaccharide, most preferably, the deposition aid is locust bean gum.
- A method according to any preceding claim wherein the composition comprises a soil release polymer selected form water soluble/miscible or dispersible polyester.
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EP09765764.7A EP2300586B1 (en) | 2008-06-16 | 2009-06-08 | Improvements relating to fabric cleaning |
PCT/EP2009/057019 WO2009153184A1 (en) | 2008-06-16 | 2009-06-08 | Improvements relating to fabric cleaning |
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2009
- 2009-06-08 WO PCT/EP2009/057019 patent/WO2009153184A1/en active Application Filing
- 2009-06-08 AU AU2009259498A patent/AU2009259498B2/en not_active Ceased
- 2009-06-08 PL PL09765764T patent/PL2300586T3/en unknown
- 2009-06-08 EP EP09765764.7A patent/EP2300586B1/en not_active Revoked
- 2009-06-08 CA CA2728378A patent/CA2728378A1/en not_active Abandoned
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Cited By (1)
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EP3814469B1 (en) * | 2018-06-28 | 2024-01-17 | The Procter & Gamble Company | Fabric treatment compositions with polymer system and related processes |
Also Published As
Publication number | Publication date |
---|---|
PL2300586T3 (en) | 2015-08-31 |
WO2009153184A1 (en) | 2009-12-23 |
AU2009259498B2 (en) | 2013-02-21 |
CA2728378A1 (en) | 2009-12-23 |
AU2009259498A1 (en) | 2009-12-23 |
EP2300586A1 (en) | 2011-03-30 |
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