Laundry detergent product

Abstract

A transparent container comprising an aqueous liquid laundry detergent composition wherein the aqueous liquid laundry detergent composition comprises from 1 to 50 wt. % of linear alkyl benzene sulphonate (LAS), wherein the LAS comprises at most 18 wt.% of 2-phenyl isomer LAS, based on the total weight of LAS; and a dye comprising triphenylmethane dye, mono-azo dye, anthraquinone dye or a combination thereof; and preferably from 0.001 to 5 wt.% fragrance; and wherein the container has an internal volume of from 0.1 to 10 L; and wherein the maximum absorbance of the aqueous liquid laundry detergent composition in the range of from 500 to 700nm and as measured at a 1cm pathlength is from 0.02 to 1; and wherein the pH of the aqueous liquid laundry detergent composition when measured at 20 degrees Celsius is from 5.0 to 7.3.

Description

LAUNDRY DETERGENT PRODUCTField of the inventionThe present invention relates to a transparent container comprising an aqueous liquid laundry detergent composition with improved color stability.Background of the inventionTransparent containers for aqueous liquid laundry detergent compositions are known. These are typically in the shape of a bottle. The benefit of using transparent containers is that the consumer can readily monitor by eye the amount of laundry detergent remaining during usage. For this technical purpose and for the purpose of aesthetics, the aqueous liquid laundry detergent composition is typically given a distinct color.Liquid laundry detergent compositions contain a variety of detergent active ingredients of which surfactants are ubiquitous. Linear alkyl benzene sulphonate (LAS) is widely used and appreciated in providing superior cleaning and detergency activity.A problem with transparent containers for aqueous liquid laundry detergent compositions with dyes is that these can be exposed to sunlight during storage, transport and use, which can cause color change (such as browning and / or dye-fading) of the detergent, which is undesirable.Compounding this problem is the growing use of recycled plastic in plastic containers. To mitigate environmental problems associated with use of virgin plastics, increasing levels of recycled plastic are used in plastic containers for aqueous liquid laundry detergent compositions. However, increasing the level of recycled plastic may worsen the sensitivity of the aqueous liquid laundry detergent composition in plastic containers to sunlight-induced color change.The problem of color change upon exposure of sunlight is particularly apparent when the aqueous liquid laundry detergent composition is not intensely colored. In such detergents a color change caused by sunlight exposure becomes readily visible by the consumer. When the liquid is intensely colored this problem may not be noticeable. Hence part of the observed problem is that the issue is relevant for detergent liquids which have relatively low intensity of dye coloring.It was found that further compounding the above problems is that for some types of LAS, in particular those which have a low 2-phenyl isomer content the color change is particularly problematic. However, in some cases, due to LAS supply constraints, the use of LAS having low 2-phenyl isomer content is difficult to avoid.It is an object of the invention to provide a transparent container comprising a low intensity colored aqueous liquid laundry detergent composition and wherein the detergent composition comprises LAS which has a low 2-phenyl isomer content, wherein the color stability colour stability upon exposure to sunlight is improved, preferably for containers which contain recycled plastic.Summary of the inventionOne or more of the above objects are achieved in a first aspect of the invention by a transparent container comprising an aqueous liquid laundry detergent composition wherein the aqueous liquid laundry detergent composition comprises:• from 1 to 50 wt. % of linear alkyl benzene sulphonate (LAS), wherein the LAS comprises at most 18 wt.% of the 2-phenyl isomer LAS, based on the total weight of LAS; and• a dye comprising triphenylmethane dye, mono-azo dye, anthraquinone dye or a combination thereof; and• preferably from 0.001 to 5 wt.% fragrance; and wherein the container has an internal volume of from 0.1 to 10 L; and wherein the maximum absorbance of the aqueous liquid laundry detergent composition in the range of from 500 to 700nm and as measured at a 1cm pathlength is from 0.02 to 1; and wherein the pH of the aqueous liquid laundry detergent composition when measured at 20 degrees Celsius is from 5.0 to 7.3.Dye fading can be measured by a reduction in absorbance at the dye’s max absorbance wavelength. It was surprisingly observed that dye fading caused by LAS, comprising at most 18 wt. % of the 2-phenyl isomer LAS, based on total LAS can be reduced, when restricting the pH to from 5.0 to 7.3. It was surprisingly found that the colour upon exposure to sunlight could be further improved by addition of a hindered phenol antioxidant. It was further surprisingly found that the colour stability could be yet further improved when the fragrance comprises at most 0.3 wt.%, as based on the totalweight of the detergent composition of fragrance molecules comprising a phenol moiety substituted with at least one -CHO group.In a second aspect the invention relates to a process for the manufacture of a detergent product according to the first aspect of the invention.In a third aspect the invention relates to the use of a pH of from 5.0 to 7.3 to reduce dye fading in liquid laundry detergents which comprise linear alkyl benzene sulphonate, wherein the LAS comprises at most 18 wt.% of 2-phenyl isomer LAS, based on the total weight of LAS, upon exposure of sunlight and even more preferably wherein the detergent has a maximum absorption of in the range of from 500 to 700nm of from 0.02 to 1 , as measured at a 1cm pathlength.Detailed description of the inventionDefinitionsUnless otherwise stated or is made clear from the context, with ‘the composition’ or ‘detergent’ is meant the aqueous liquid laundry detergent composition as such, not including the container; with ‘the container’ is meant the plastic transparent container as such, not including the aqueous liquid laundry detergent composition; with ‘the product’ is meant the plastic transparent container + the aqueous liquid laundry detergent composition contained therein. Weight percentage (wt. %) is based on the total weight of the aqueous liquid laundry detergent composition, the container, or the product as indicated or as made clear from the context. It will be appreciated that the total weight amount of ingredients will not exceed 100 wt. %.Whenever an amount or concentration of a component is quantified herein, unless indicated otherwise, the quantified amount or quantified concentration relates to said component per se, even though it may be common practice to add such a component in the form of a solution or of a blend with one or more other ingredients. It is furthermore to be understood that the verb "to comprise" and its conjugations is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. Finally, reference to an element by the indefinite article "a" or "an" does not exclude the possibility that more than one of the elements is present, unless the context clearly requires that there be one and only one of the elements. The indefinite article "a" or "an" thus usually means "at least one".P0001115WC- 4 - llnless otherwise specified all measurements are taken at standard conditions. Whenever a parameter, such as a concentration or a ratio, is said to be less than a certain upper limit it should be understood that in the absence of a specified lower limit the lower limit for said parameter is 0.5When considering amounts of LAS in this specification, reference is made to the amount of (pure) linear alkyl benzene sulphonate, not including any impurities which may be found in commercial LAS raw material, unless otherwise made clear from the context.The term “liquid” in the context of this invention denotes that a continuous phase or predominant part of the detergent is liquid, and that the composition is flowable at 15 degrees Celsius or higher. Accordingly, the term “liquid” may encompass emulsions, suspensions, and compositions having flowable yet stiffer consistency, such as gels.15 The viscosity of the detergent is preferably from 200 to about 10,000 mPa.s at 25 degrees Celsius at a shear rate of 21 sec1. This shear rate is the shear rate that is usually exerted on the liquid when poured from a bottle. Pourable liquid detergents preferably have a viscosity of from 200 to 1 ,500 mPa.s, preferably from 200 to 700 mPa.s.20 The liquid detergent of the invention is aqueous, meaning it contains at least 10 wt.% water. Preferably, the composition comprises at least 40 wt.%, more preferably 50 wt.%, even more preferably 60 wt.% water and still more preferably at least 70 wt.% water.The container of the invention is transparent. The term ‘transparent’ as used herein25 refers to the ability of light within the visible spectrum (400 to 700 nm) to pass through the container wall. The transparency can be quantified as the ratio between the light intensity measured after the light has passed through a representative material sample and the light intensity measured when the material sample has been removed. The ratio can be converted to a percentage Transmittance (multiply the ratio x 100) ranging30 from 0% (no incoming light having passed through the material sample) to 100% (i.e. no difference in light having passed through with or without material sample). As used herein the term ‘transparent’ refers to a Transmittance of at least 10% within the wavelength range of 400 to 700 nm, preferably of at least 20 %, 30 %, 40 %, 50 %,60%, 70%, 80%, in increasing order of preference, and still even more preferably of at least 90 %.Preferably at least 30 %, 50 %, 70 % and even more preferably at least 85 % of the total outer container surface area of the container is transparent. This is preferably determined while taking into account externally applied labels and / or stickers. Transmittance of the container material can be suitably measured by using a LIV-VIS Spectrometer, preferably as based on a light path-length through the plastic material sample of 1 mm. Suitable LIV-VIS spectrometers are available from a variety of suppliers, including Thermo Scientific, Perkin Elmer and Shimadzu.The transparency of the aqueous liquid laundry detergent composition is suitably measured in the same way but using a light path-length of 1 cm through the liquid to standardize the measurement. Transparency of liquid is typically determined by use of a cuvette, wherein the transmittance of the liquid is based on the ratio between a cuvette with the liquid detergent versus an empty cuvette (x100). The suitable cuvette to use is usually indicated in the Supplier instructions of the LIV-VIS spectrometer. The liquid detergent preferably has an average transmittance in the wavelength range of from 500 to 700 nm, based on a path-length of 1cm, of at least 20 %. More preferably the transmittance is at least 30%, even more preferably at least 50 % and still even more preferably at least 70%. Obviously as the liquid is colored, the average transmittance across the visible wavelengths will be below 100% and preferably is at most 90 % and even more preferably at most 80 %.A label carrying product information may be applied onto the outside of the transparent container surface. The label is advantageously in part non-transparent to improve readability of any information thereon. Application of such labels is to communicate information about the product to the consumer, some of which information is necessitated by law or regulation. The label can be applied as a heat-shrinkable sleeve, a suitable sticker, or in any other suitable manner. It is advantageous that the label, if present, is thin, meaning it has a thickness of from 0.01 to 2 mm and is itself made from a recyclable plastic. More preferably the label does not reduce the transparent surface area of the plastic transparent container by more than 50 %, preferably by no more than 30 % and even more preferably by no more than 20 %.P0001115WC- 6 -As made clear from the above, closed containers wherein colored liquid contents can be observed through (a part) of the container wall, advantageously through (a part) of the one or more of the sidewalls, when the container is placed in an upright position on a flat surface, are contemplated by the claims.5SurfactantThe liquid detergent of the invention comprises from 2 to 60 wt. % of total surfactant, more preferably from 3 to 50 wt. % and even more preferably from 10 to 30 wt.%. Preferably greater than 95% of the surfactant is selected from anionic and nonionic surfactant and mixtures thereof. Weights of anionic surfactants refer to their protonated form. In general, the amounts of surfactants are based on the total weight of the aqueous liquid detergent composition.In general, the nonionic and anionic surfactants of the surfactant system may be15 chosen from the surfactants described "Surface Active Agents" Vol. 1 , by Schwartz & Perry, Interscience 1949, Vol. 2 by Schwartz, Perry & Berch, Interscience 1958, in the current edition of "McCutcheon's Emulsifiers and Detergents" published by Manufacturing Confectioners Company or in "Tenside-Taschenbuch", H. Stache, 2nd Edn., Carl Hauser Verlag, 1981. Preferably the surfactants used are saturated.20Nonionic surfactants are discussed in Non-ionic Surfactants: Organic Chemistry edited by Nico M. van Os (Marcel Dekker 1998), Surfactant Science Series published by CRC press. Preferred non-ionic surfactants are alkoxylated, preferably ethoxylated.Preferred non-ionic surfactant are alcohol ethoxylates and methyl ester ethoxylates,25 with C10-C18 alkyl chains. Commonly used in laundry liquid compositions are C12-C18 saturated and monounsaturated alcohol ethoxylates having a straight or branched chain alkyl group containing an average of 5 to 12EO units per molecule. Preferred examples are selected from saturated linear C12, C14 or C16 chains and branched or linear saturated C15 alcohol ethoxylates with a mole average of 7 to 9 ethoxylate units.30 A preferred methyl ester ethoxylate comprises C16, C18 and C18:1 and a mol average of 8 to 12 ethoxylate groups. More preferably the methyl ester comprises 20 to 50 wt.% C16 MEE and 20 to 50 wt.% C18:1 MEE. C18:1 is preferably an oleic moiety and C16 and C18 are saturated.P0001115WC- 7 -Advantageously the detergent composition comprises at least 90 wt.% of methyl ester ethoxylates, alcohol ethoxylate or combinations thereof based on the total amount of non-ionic surfactant.5 Typically, ethoxylation reactions to form alcohol ethoyxlates are base catalyzed using NaOH, KOH, or NaOCH3. The reaction produces a distribution of ethoxy chain lengths in the alcohol ethoxylate. Narrow range ethoxylation provides a narrower distribution of ethoxy chain lengths than NaOH, KOH, or NaOCH3. Narrow range ethoxylation is achieved using narrow range ethoxylation catalysts Narrow range ethoxylation catalyst are described in EP3289790 (Procter & Gamble), EP1747183(Hacros); Santacesatia et al Ind. Eng. Chem. Res. 1992, 31 , 2419-2421 ; US4239917(Conoco); Li et al ACS Omega. 2021 Nov 9; 6(44): 29774-29780; Hreczuch et al J. Am. Oil Chem. Soc. 1996, 73, 73-78 and WO2022 / 129374 (Unilever). Ethoxylation reactions are described in Non-lonic Surfactant Organic Chemistry (N. M. van Os ed), Surfactant Science Series15 Volume 72, CRC Press.Anionic surfactants are discussed in the Anionic Surfactants: Organic Chemistry edited by Helmut W. Stache (Marcel Dekker 1995), Surfactant Science Series published by CRC press. Preferred anionic surfactants are sulfonate and sulfate surfactants,20 preferably alkylbenzene sulphonates, alkyl sulfates and alkyl ether sulfates. Preferred alkyl groups for alkyl sulfates and alkyl ether sulfates are selected from linear of branched C12-C18 saturate alkyl chains and monounsaturated C18 chains.In the liquid detergent compositions C12-C14 alkyl ether sulfates having a straight or25 branched chain alkyl group having 12 to 14 carbon atoms (C12-14) and containing an average of 1 to 3EO units per molecule are preferred. A preferred example is sodium lauryl ether sulfate (SLES) in which the predominantly C12 lauryl alkyl group has been ethoxylated with an average of 3EO units per molecule.Advantageously the liquid detergent composition according comprises at least 90 wt.% of alkyl ether sulfate, linear alkyl benzene sulfonates or combinations thereof based on the total amount of anionic surfactant. Preferably both alkyl ether sulfate and linear alkyl benzene sulfonates are present, preferably the weight ratio of alkyl ether sulfate / linear alkyl benzene sulfonates is from 0.5 to 2.35The anionic surfactant is preferably added to the detergent composition in the form of a salt. Preferred cations are alkali metal ions, such as sodium and potassium. However, the salt form of the anionic surfactant may be formed in situ by neutralization of the acid form of the surfactant with alkali such as sodium hydroxide or an amine, such as mono-, di-, or tri-ethanolamine. Weight ratios are calculated for the protonated form of the surfactant. Ethoxy units may be partially replaced by propoxy units in anionic and non-ionic surfactants.Further examples of suitable anionic surfactants are rhamnolipids, alpha-olefin sulfonates, olefin sulfonates, alkene sulfonates, alkane-2,3-diylbis(sulfates), hydroxyalkanesulfonates and disulfonates, fatty alcohol sulfates (FAS), paraffin sulfonates, ester sulfonates, sulfonated fatty acid glycerol esters, methyl ester sulfonate alkyl- or alkenylsuccinic acid, dodecenyl / tetradecenyl succinic acid (DTSA), fatty acid derivatives of amino acids, DATEM’s, CITREM’s and diesters and monoesters of sulfo-succinic acid.Preferably the weight fraction of non-ionic surfactant / total anionic surfactant is from 0.1 to 9, more preferably 0.15 to 2, most preferably 0.2 to 1. By total anionic surfactant means the total content of any of the classes of anionic surfactantEthoxy units may be partially replaced by propoxy units in anionic and non-ionic surfactants.Linear alkyl benzene sulphonateThe liquid detergent of the invention comprises linear alkyl benzene sulphonate (LAS).LAS is produced by sulphonation of linear alkyl benzene (LAB). LAB may be synthesised by a number of different routes as outlined in the Russian Journal of Applied Chemistry, 2021, Vol. 94, No. 11, pp. 1546-1559. Preferably the LAB used to produce the LAS is made by the HF process. This route is described in detail in Linear Alkylbenzenes: An Overview of the Commercial HF and Detal™ Process Unit Alkylation Technology (Case Study) by Stephen Sohn and Phuong Do in Industrial Arene Chemistry: Markets, Technologies, Sustainable Processes and Cases Studies of Aromatic Commodities, First Edition. Edited by Jacques Mortier. © 2023 WILEY-VCHGmbH. Sulphonation of LAB is preferably done in a falling film reactor using SO3, available from Ballestra.The key intermediate compound in the manufacture of LAS is the relevant alkene. These alkenes (olefins) may be produced by any of the methods described above and may be formed from primary sugars, biomass, waste plastic, MSW, carbon capture, methane capture, marine carbon to name a few. Whereas in the processed described above the olefin is processed to form linear alcohols by hydroformylation and oxidation instead, the olefin is reacted with benzene and then sulphonate to form the LAS. Linear alkylbenzene sulfonates with an alkyl chain length of from 10 to 18 carbon atoms. Commercial LAS is a mixture of closely related isomers and homologues alkyl chain homologues, each containing an aromatic ring sulfonated at the “para" position and attached to a linear alkyl chain at any position except the terminal carbons. The linear alkyl chain preferably has a chain length of from 11 to 15 carbon atoms, with the predominant materials having a chain length of about C12. Each alkyl chain homologue consists of a mixture of all the possible sulfophenyl isomers except for the 1-phenyl isomer. LAS is normally formulated into compositions in acid (i.e. HLAS) form and then at least partially neutralized in-situ.Linear alkyl benzene sulphonate is manufactured on an industrial scale using commercial processes which can differ in the catalyst system employed. Commercial scale production can use an aluminum trichloride catalyst, a hydrogen fluoride catalyst, or a solid alkylation catalyst. The DETAL process involves the solid alkylation catalyst. The different processes result in alkylbenzene sulphonate products with different 2- phenyl isomer content.LAS has the general structure as depicted in the following figure, where the phenyl group may be attached to any of the carbons on the ring:P0001115WC- 10 - where n is preferably from 2 to 5; and wherein X is a counter ion which for preferred As such a LAS is a mixture of different phenyl-isomers on alkyl chains of variable length where different LAS production processes lead to different isomer distribution profiles.5LAS is sodium, protonated triethanol amine and / or or protonated monoethanol amine. Preferred LAS has at least 80 wt.%, more preferably at least 85 wt.%, even more preferably at least 90 wt.%, still even more preferably at least 95 wt. % and still even more preferably at least 99 wt. % of LAS with C10 to C13 alkyl chains, as based on the weight of the total LAS.The structure of 2-phenyl isomer LAS with a C12 chain is shown in the following figure as an example:15The typical 2-phenyl isomer LAS content for linear alkylbenzene sulphonates produced using the hydrogen fluoride catalyst typically is from 16 to 18 wt. %, based on the total weight of LAS. When using the DETAL process the typical 2-phenyl isomer LAS20 content is at least 20 wt.%, based on the total weight of LAS. Further reference to the DETAL process and the phenyl isomers can be found in US6849588B2, US 2003 / 0096726A1 and US8389785B2.PETRELAB® 550 - Q (ex Cepsa) is a commercially available source of Detal based25 high 2-phenyl LAB, that may be sulphonated to give a high 2-phenyl LAS. Sulfonation may be achieved by Falling Film Reactor (FFR) sulfonation. The distribution of alkyl chain length of PETRELAB® 550 are 13 wt.% C10, 32 wt.% C11, 35 wt.% C12, 19 wt.% C13 with other chain lengths at an amount of 1 wt.% or less, as based on the weight of the total LAS. The total level of 2-phenyl alkanes of PETRELAB® 550 is30 28wt%, based on the total LAS.P0001115WG- 11 -DetLAS®320 (Ex CEPSA; Cepsa Quimica S.A. Torre Cepsa. Paseo de la Castellana 259 A 28046 Madrid (Spain)) is an example of a C10-C13 LAS acid which has a low 2- phenyl isomer LAS content that is produced by HF technology. The average alkyl chain length of DetLAS®320 is 11.6. Stil Other suppliers of LAB and LAS include Sasol,5 IOCL, Relaince, Sinopec and Farabi.Analysis of LAS by GC and HPLC is discussed in detail in SURFACTANTS Chromatography by J.G. Lawrence, in Encyclopedia of Separation Science, 2000 and in chapter 2, section IV page 89-92 of Anionic Surfactants: Organic Chemistry edited by Helmut W. Stache (Marcel Dekker 1995), Surfactant Science Series published by CRC press.The wt.% of 2-phenyl isomer LAS, based on the total weight of LAS, may be measured using GC-MS and GC-FID detection. The MS is good for identification of the isomer15 and then the FID for the quantification, as described in Journal of Chromatography A, 1218 (2011) 343-349 by Moldovan et al. A method for determining the 2-phenyl isomer content in linear alkyl benzene is given in Universal Oil Products (UOP) standard 673.20 The wt.% of 2-phenyl isomer LAS, based on the total weight of LAS is preferably measured by 13C NMR as described in Carminati, G., Cavalli, L. & Buosi, F. Application of 13C NMR to the identification of surfactants in mixture. J Am Oil Chem Soc 65, 669-677 (1988).25 LAS which especially benefits from the invention contains at most 17 wt.%, preferably at most 16 wt.%, more preferably at most 14 wt.% and even more preferably at most 12 wt.% of 2-phenyl isomer LAS, based on the total weight LAS.For a simplified production process the LAS is made solely via the hydrogen fluoride30 catalyst process and has from 14 to 18 wt.%, preferably from 15 to 18 wt.% and even more preferably 16 to 18 wt.% of 2-phenyl isomer LAS, based on the total weight of LAS.P0001115WC- 12 -The preferred amount of LAS in the detergent of the invention is from 1.0 to 40 wt.%, more preferably 1.5 to 30 wt.%, even more preferably from 2.0 to 20 wt.%, still even more preferably from 2.5 to 10 wt.% and still even more preferably from 6 to 12 wt.%.5 The hindered phenols are particularly effective when the amount of LAS in the detergent of the invention is from 1 to 6 wt.%, more preferably 2 to 4 wt.%.The LAS weight in general is determined based on the weight of its protonated form.The liquid detergent preferably comprises from 0.1 to 5 wt.% ethanol, as based on the total weight of the aqueous liquid detergent composition.DyesDyes are described in Industrial Dyes edited by K. Hunger 2003 Wiley-VCH ISBN 3-15 527 -30426-6. Dyes for use in the current invention are selected from cationic, anionic and non-ionic dyes and preferably are selected from anionic and non-ionic dyes. Anionic dyes are negatively charged in an aqueous medium at pH 7. Examples of anionic dyes are found in the classes of acid and direct dyes in the Color Index (Society of Dyers and Colourists and American Association of Textile Chemists and20 Colorists). Anionic dyes preferably contain at least one sulphonate or carboxylate groups. Non-ionic dyes are uncharged in an aqueous medium at pH 7, examples are found in the class of disperse dyes in the Color Index.The dye used in the invention comprises a triphenylmethane dye, azo dye,25 anthraquinone dye or a combination thereof and beneficially the dye consists of one or more of these dyes. Preferably the anthraquinone dye contains an amine group or an acid amide group in the 1 -position of the anthraquinone ring. Preferably the azo dye is a mono-azo dye and more preferably is a heterocyclic mono-azo dye.The depth of dye-color of a solution (color intensity of the solution) may be measured by the optical absorbance measure by UV-VIS spectroscopy. The (optical) absorbance, A is defined as:A = Log (lo / l) where Io is the intensity of the incident light, and I is intensity of that light after it passed35 through the sample. The absorbance is also called the optical density.The optical absorbance follows the Beer Lambert law: A = £[dye]PL where A is the optical absorbance, e is the dye extinction coefficient in L / mol / cm, [dye] is the dye concentration in mol / L and PL is the path length in cm.The maximum (optical) absorbance in the range 500 to 700nm of the detergent liquid measured at 1cm pathlength is less than 1, preferably from 0.05 to less than 1, more preferably from 0.1 to 0.6 and even more preferably from 0.2 to 0.4. The absorbance measurement is carried out in otherwise standard conditions using a UV-VIS Spectrometer. The absorbance of the detergent liquid can be adjusted by adjusting the dye levels.It was found that the invention is especially useful for those aqueous liquid laundry detergents which have lower maximum optical absorbance (less intensely colored), since any sunlight induced dye fading I color change was found to be more readily observable to the naked eye. In addition, any color change such as browning which may occur upon sunlight exposure of an aqueous liquid laundry composition would not be readily masked if the liquid is less intensely colored. Hence the invention solves a problem, which is particular for liquids as claimed having maximum (optical) absorbance in the range 500 to 700nm of the dye in the detergent liquid, as measured at 1cm pathlength, of less than 1. The maximum absorbance of the liquid is advantageously measured directly after production. Optionally this maximum absorbance directly after production can be derived from liquid laundry detergent analysis of dye and any specific dye breakdown products at a later stage.The dyes of the invention preferably have a maximum extinction coefficient of greater than 5000 L / mol / cm, preferably greater than 10 000 L / mol / cm in the range of 500 to 700 nm.Dyes may vary in their absorbance efficiency in the wavelength in the range of from 500 to 700 nm. Hence detergents having a maximum (optical) absorbance in the range 500 to 700nm of the dye in the detergent liquid, as measured at 1cm pathlength, of less than 1 are less accurately described by the amounts as such. In general, however, the preferred total amount of dyes is from 0.00001 to 0.1 wt.%, more preferably from 0.00005 to 0.5 wt.%, even more preferably from 0.0001 to 0.01 wt. % and still evenmore preferably from 0.0002 to 0.005 wt.% as based on to the total weight of the aqueous liquid detergent composition.Preferred dye is red, green, blue, violet, or yellow in color, and more preferred dye is blue or violet. Preferred is that the dye used, alone or in combination, provides a violet, blue or green colour to the aqueous liquid detergent composition.The aqueous liquid laundry detergent composition is preferably transparent. The absorption at 800nm is a measure of scattering in solution and by extension a measure of transparency. In this respect when the LIV-VIS spectrum of the detergent solution is taken, the absorption at 800nm is preferably less than 0.1, more preferably less than 0.05 and even more preferably less than 0.01.The dye of the invention is preferably an alkoxylated dye. An alkoxylated dye contains at least one poly-alkoxy containing group covalently bound to the chromophore. The poly-alkoxy containing group may be bound directly to an aromatic ring of the chromophore or more may be bound indirectly, such as via an N-atom of an amine or acid amide group. The polyalkoxy group may contain a linker moiety and have the following structure:-linker-(alkoxy)nThe alkoxy-monomers preferably have 2 to 4 carbon atoms and may form a mixed poly-alkoxylate, such as a poly-alkoxylate comprising both ethoxylate, propoxylate and butoxylate monomers. Dyes which have alkoxy monomers of the same type are preferred. Dyes with ethoxy monomers are preferred. Alkoxylated dyes are described in W02022056205 (Milliken).Preferred examples of azo dyes are direct violet 9, direct violet 99, direct violet 35, direct violet 51, disperse blue 284, disperse blue 124, disperse blue 165, disperse blue 79:1, disperse red 177, acid red 23, acid red 24, acid red 17, acid red 27, acid red 88.Heterocylic mono-azo dyes (contain only 1 azo group) and a heterocylic ring system. Examples of heterocyclic mono-azo dyes are azothiophenene, azobenzothiazoles and azopyridones.P0001115WQ- 15 -Preferred examples of triphenyl methane dyes are Acid Blue 1, Acid Blue 3, Acid Blue9, Acid Violet 17, Acid Violet 21, Acid Violet 38. A preferred structure is:5 wherein R3 to Re are independently selected organic groups or H, preferably ethoxy chains, H, C1-C4 alkyl, Benzyl groups which contains a SOa" group bound to the aromatic ring. Preferably ring A contains a SOa" group.Preferred anthraquinone dyes comprise a chromophore which contains an amine group or an acid amide group in the 1 -position of the anthraquinone ring. The general structure of the anthraquinone dye with the positions of the ring indicated is given by the following structure:15Advantageously the amount of the anthraquinone dye of the invention in the aqueous liquid laundry composition of the invention is from 0.0001 to 0.01 wt. %, more preferably from 0.0001 to 0.005 wt. %, as based on to the total weight of the aqueous liquid detergent composition. In general, in case of anionic anthraquinone dyes, the wt.20 % is based on their sodium salt form.Preferred examples of anthraquinone dye are Solvent violet 13, Disperse Violet 1, Disperse Violet 4, Disperse Violet 6, Disperse Violet 8, Disperse Violet 17, Disperse Violet 23, Disperse Violet 26, Disperse Violet 28, Disperse violet 28, Disperse violet25 57, Disperse violet 62, Disperse Blue 1, Disperse Blue 3, Disperse Blue 5, DisperseBlue 6, , Disperse Blue 7, Disperse Blue 8, Disperse Blue 9, Disperse Blue 14, , Disperse Blue 19, Disperse Blue 22, Disperse Blue 23, Disperse Blue 24, Disperse Blue 26, Disperse Blue 27, Disperse Blue 28, Disperse Blue34, Disperse Blue 40, Disperse Blue 56, Disperse Blue 72, , Disperse Blue 73, Disperse Blue 77, Disperse Blue 81, Disperse Blue 83, Disperse Blue 87, Disperse Blue 104, Disperse Blue 109, Disperse Blue 118, Disperse Blue 127, Disperse Blue 134, Disperse Blue 377, Acid Violet 41, Acid violet 42, Acid violet 43, Acid violet 48, Acid violet 51 Acid Green 25, Acid Blue 23, Acid blue 25, Acid Blue 27, Acid blue 40, Acid Blue 43, Acid Blue 47, Acid Blue 49, Acid Blue 51, Acid Blue 53, Acid Blue 55, Acid Blue 56, Acid Blue 62, Acid Blue 68, Acid Blue 69, Acid Blue 78, Acid Blue 80, Acid Blue 81:1, Acid Blue, Acid Blue 96, Acid Blue 124, Acid Blue 128, Acid Blue 129, Acid Blue 175, Acid Blue 215, Acid Blue 230, Acid Blue 277, Acid Green 25 and Acid Green 41. The dye names refer to the Colour Index™ Generic Name, published by the Society of Dyers and Colourists (SDC) and American Association of Textile Chemists and Colourists (AATCC). Of the above dyes Acid green 25, Acid blue 80, solvent Violet 13, Disperse Violet 28 and Acid Violet 43 or combinations thereof are particularly preferred.Beneficially the anthraquinone dye of the invention is sulphonated and more preferred dyes in this sense are 1-aminoanthraquinone-2-sulfonic acid, diaminodihydroxyanthraquinonesulfonic acids, 1,4-diaminoanthraquinones with external sulfonic acid groups as described in Industrial Dyes: Chemistry, Properties, Applications (Wiley-VCH 2003) edited by Klaus Hunger.Blue Dyes are preferably selected from Acid Blue 9, acid blue 3 and ethoxylated dyes:and and equivalent molecules thereof with different degrees of ethoxylation, preferably each ethoxy chain has a mole average of 2 to 15 ethoxy units.Further preferred blue dyes are selected from:P0001115WG- 17 -Where R2, R3, X and Y are H or an organic groups and at least one of the groups R2, R3, X and Y contains a -[CH2CH2O]nH group. Preferred examples are 1-amino-2- polyethylenoxy-4-phenylamino-anthraquinone, 1-amino-2-methoxy-4-[-4-5 polyethleneoxy-anilyl]anthraquinone, 1-amino-2-polyethyleneoxy-4-(2,4,6- trimethylphenylamino) anthraquinone and N,N'-dialkyleneoxy-substituted 1 ,4- diaminoanthraquinones. More preferred are N,N'-dialkyleneoxy-substituted 1 ,4- diaminoanthraquinones. Most preferably X=Y=H and R2 and R3 are - CH2CH2CH2O(CH2CH2O)2RI as described in example 1 and 2 of US7632682.10Green dyes are preferably selected from Acid green 25, and ethoxylated dyes:and equivalent molecules thereof with different degrees of ethoxylation, preferably each ethoxy chain has a mole average of 2 to 15 ethoxy units.Red dyes are preferably selected from acid red mono azo dyes and ethoxylated dyes:20 and equivalent molecules thereof with different degrees of ethoxylation, preferably each ethoxy chain has a mole average of 2 to 15 ethoxy units.Yellow dyes are preferably selected from:and equivalent molecules thereof with different degrees of ethoxylation, preferably each ethoxy chain has a mole average of 2 to 15 ethoxy units.Violet dyes are preferably selected from Solvent Violet 13, Acid Violet 43, disperse violet 28, and ethoxylated dyes:and equivalent molecules thereof with different degrees of ethoxylation, preferably each ethoxy chain has a mole average of 2 to 15 ethoxy units.In the -[ethoxy]nmoiety, ‘n’ generally refers to the average number of alkoxymonomers, in which ‘n’ thus can represents the average of a distribution. In this case beneficial are -[ethoxy]nmoiety distributions in which the most prevalent molecular species has an ethoxy number which corresponds to that of the distribution average ‘n’. Further preferred are those distributions in which the molecular species with a degree of alkoxylation corresponding to the average number ‘n’ is present in a higher molar %. For example, if ‘n’ is 4 than a distribution of 25% n=2, 50% n=4 and 25% n=6 is more preferred than a distribution of 30% n=2, 40% n=4 and 30% n=6. This beneficially applies to the average number of alkoxy-monomers in the alkoxylated dye as a whole and / or the average number of alkoxy-monomers in an individual poly-alkoxy containing group.Dyes other than anthraquinones, triphenylmethane and azo dyes may be present, however their amount is preferably at most 20 wt. %, more preferably at most 10 wt.%, even more preferably at most 5 wt.%, based on the total amount of dye, and still even more preferably other dyes are not present.As shown in the examples the invention is especially useful to stabilize triphenylmethane and mono-azo dyes at a pH range of 6.8 to 8.5, more preferably 7.0 to 8.3 as measured at 20 degrees Celsius. As shown in the examples the invention is especially useful to stabilize anthraquinone dyes at a pH range of 6.0 to 7.5, more preferably 6.0 to 7.0 as measured at 20 degrees Celsius.The dye of the invention preferably comprises at most 3 different types of dyes, more preferably at most 2 and even more preferably at most 1.Hindered Phenol antioxidant The aqueous liquid laundry detergent of the invention preferably comprises hindered phenol antioxidant. Hindered phenol antioxidants contain the chemical moietywherein Ri is an organic group preferably containing no other atoms than C, H and O; and wherein R2 is selected from methyl, ethyl and tert-butyl (-C(CH3)3) and preferably R2 is tert-butyl.Preferably the hinder phenol comprises one or more of the following structures:Advantageously the hindered phenol antioxidant essentially consists of butylated hydroxy toluene.Preferably the hindered phenol antioxidant has a molecular weight (Mw) below 1200. Preferably the number of hindered phenol moieties in the structure is 1 ,2,3 or 4.Where the number of hindered phenol moieties is denoted by ‘x’, preferably the Mw / x (the molecular weight divided by the number of hindered phenol moieties) is from 220 to 300.Hindered phenol antioxidants may be obtained from BASF under the Irganox™ trade name. Preferred examples are Irganox 245, Irganox 1010, Irganox 1076, Irganox 1098, Irganox 1330.The aqueous liquid laundry detergent composition of the invention preferably comprises hindered phenol antioxidant in an amount of from 0.005 to 0.1 wt.%. More advantageously the amount of hindered phenol antioxidant is from 0.01 to 0.08 wt.%, even more preferably from 0.015 to 0.06 wt.%, still even more preferably from 0.020 to 0.05 wt.% and still even more preferably from 0.022 to 0.04 wt.% and still even more preferably from 0.023 to 0.035 wt.%. The more preferred ranges provide a further optimization of overall color stability, which stems from enhanced dye protection and may stem from controlling yellowing.FragranceThe aqueous liquid laundry detergent composition preferably comprises fragrance (perfume), in an amount of from 0.001 to 5 wt.%, more preferably of from 0.005 to 3wt.%, even more preferably of from 0.01 to 2 wt.% and still even more preferably of from 0.1 to 1.5 wt.%, as based on the total weight of the aqueous liquid laundry detergent. Many suitable examples of perfumes are provided in the CTFA (Cosmetic, Toiletry and Fragrance Association) 1992 International Buyers Guide, published by CFTA Publications and OPD 1993 Chemicals Buyers Directory 80th Annual Edition, published by Schnell Publishing Co. In perfume mixtures preferably 15 to 25 wt. % are top notes. Top notes are defined by Poucher (Journal of the Society of Cosmetic Chemists 6(2):80

[1955] ). Preferred top-notes are selected from citrus oils, linalool, linalyl acetate, lavender, dihydromyrcenol, rose oxide and cis-3-hexanol.The fragrance of the invention advantageously comprises at most 0.3 wt.%, more preferably from 0.002 to 0.2 wt.%, even more preferably from 0.005 to 0.06 wt.%, as based on the total weight of the aqueous liquid detergent composition, of fragrance molecules comprising a phenol moiety substituted with at least one -CHO group. For avoidance of doubt the -CHO group is attached directly to the aromatic ring.Examples of such fragrance comprising a phenol moiety substituted with at least one - CHO group are the following structureswherein Ri is selected from branched and / or linear Ci-Ce alkyl and more preferably from -CH3 and / or -C2H5. Other examples are vanillin and ethyl vanillin.It was found that controlling the level of such fragrance comprising a phenol moiety substituted with at least one -CHO group improved color stability of the liquid laundry composition according to the invention yet considered to still optionally if desired provide some detection of the fragrance by smell. For the latter a level of fragrance comprising a phenol moiety substituted with at least one -CHO group may be at least 0.0005 wt.% as based on the total weight of the aqueous liquid laundry detergent.£HPreferably the aqueous liquid laundry detergent composition has a pH from 5.2 to 7.1 , more preferably from 5.4 to 7.0, even more preferably from 5.6 to 6.9, still even moreP0001115WC- 22 - preferably from 5.8 to 6.8, still more preferably from 6.0 to 6.7 and still even more preferably from 6.2 to 6.6, as measured at 20 degrees Celsius and at otherwise standard conditions. These more preferred pH ranges provide a further improved balance between colour stability and the cleaning performance. It is considered that in5 particular the performance and / or stability of detergent enzymes, ester-based ingredients and fatty acids is enhanced at these preferred pH ranges.Beneficially the pH of the formulation is controlled by a buffer system. Preferably the buffer system is based on citric acid, boric acid or a combination thereof, more preferably at a level of from 0.2 to 2 wt. %. Citric acid-based buffering is more preferred.A base / acid advantageously can be used to set the pH to the desired value. Triethanolamine is the most preferred base added to adjust the pH to the final values.15 The amount of triethanolamine is preferably from 0.05 to 4 wt.%, more preferably from 0.1 to 2 wt.%, even more preferably from 0.2 to 1 wt.%.Fluorescent AgentThe liquid detergent of the invention preferably comprises a fluorescent agent (also20 known as 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 detergent is generally from 0.005 to 2 wt. %, more preferably 0.01 to 0.1 wt. %, as based on the total weight25 of the aqueous liquid detergent composition. Preferred classes of fluorescer are Distyryl 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 fluorescers are: sodium 2 (4-styryl-3-sulfophenyl)-2H-napthol[1,2-d]triazole, disodium 4,4'-bis{[(4- anilino-6-(N methyl-N-2 hydroxyethyl) amino 1,3,5-triazin-2-yl)]amino}stilbene-2-2' disulfonate, 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-sulfostyryl)biphenyl.35Alkoxyated polyamine polymerThe liquid laundry detergent advantageously comprises an alkoxylated polyamine polymer. Preferably, the polyamine is an alkoxylated cationic or zwitterionic di or polyamine polymer, wherein the positive charge is provided by quaternisation of the nitrogen atoms of the amines, and the anionic groups (where present) by sulphation or sulphonation of the alkoxylated group.Preferably the alkoxylate is selected from propoxy and ethoxy, most preferably ethoxy.Preferably greater than or equal to 50 mol% of nitrogen amines are quaternised, preferably with a methyl group. Preferably the polymer contains 2 to 10, more preferably 2 to 6, most preferably 3 to 5 quanternised nitrogen amines. Preferably the alkoxylate groups are selected from ethoxy and propoxy groups, most preferably ethoxy.Preferably the polymer contains ester (COO) or acid amide (CONH) groups within the structure, preferably these groups are placed, so that when all the ester or acid amide groups are hydrolyzed, at least one, preferably all of the hydrolyzed fragments has a molecular weight of less than 4000, preferably less than 2000, most preferably less than 1000.Preferably the polymer is of the form:wherein Ri is a C3 to C8 alkyl group, X is an a (C2H4O)nY group where n is from 15 to 30, where m is from 2 to 10, preferably 2, 3, 4 or 5 and where Y is selected from H and SO3- and preferably the number of SOa" groups is greater than the number of OH groups. Preferably there are from 0, 1 or 2 OH groups. X and Ri may contain ester groups within them. X may contain a carbonyl group, preferably an ester group. Thereis preferably 1 C2H4O unit separating the ester group from the N, such that the structural unit N- C2H4O-ester- (C2H4O)n-iY is preferred.Such polymers are described in WO2021239547 (Unilever) and WO2023 / 094275 (BASF), an example polymer is sulphated ethoxylated hexamethylene diamine and examples P1 , P2, P3, P4, P5 and P6 of WO2021239547. Ester groups may be included using lactones or sodium chloroacetate (Modified Williamson synthesis), addition to an OH or NH group, then subsequent ethoxylation.Polyamine polymer is preferably present at from 0.1 to 3 wt.%, %, as based on the total weight of the aqueous liquid detergent composition.Soil release polymersSoil release polymers (SRP) help to improve the detachment of soils from the surface to be cleaned, such as a fabric or hard surface, by modifying the surface during washing. SRPs for use in the invention may include a variety of charged (e.g. anionic) as well as non-charged monomer units and structures may be linear, branched or starshaped. The SRP structure may also include capping groups to control molecular weight or to alter polymer properties such as surface activity. The weight average molecular weight (Mw) of the SRP may suitably range from about 1000 to about 20,000 and preferably ranges from about 1500 to about 10,000.SRPs for use in the invention may suitably be selected from copolyesters of dicarboxylic acids (for example adipic acid, phthalic acid or terephthalic acid), diols (for example ethylene glycol or propylene glycol) and polydiols (for example polyethylene glycol or polypropylene glycol). The copolyester may also include monomeric units substituted with anionic groups, such as for example sulfonated isophthaloyl units.Other types of SRP for use in the invention include cellulosic derivatives such as hydroxyether cellulosic polymers, C1-C4 alkylcelluloses and C4 hydroxyalkyl celluloses; polymers with poly(vinyl ester) hydrophobic segments such as graft copolymers of poly(vinyl ester), for example Ci-Ce vinyl esters (such as poly(vinyl acetate)) grafted onto polyalkylene oxide backbones; poly(vinyl caprolactam) and related co-polymers with monomers such as vinyl pyrrolidone and / or dimethylaminoethyl methacrylate; andpolyester-polyamide polymers prepared by condensing adipic acid, caprolactam, and polyethylene glycol.The overall level of SRP in the detergent preferably is from 0.1 to 10 wt.%, more preferably is from 0.3 to 7 wt.% and even more preferably is from 0.5 to 5%%, as based on the total weight of the aqueous liquid detergent composition.Suitable soil release polymers are described in greater detail in II. S. Patent Nos. 5,574,179; 4,956,447; 4,861 ,512; 4,702,857, WO2024 / 094778, WO2024 / 094785, WO2021 / 233987, WO 2007 / 079850 and WO2016 / 005271.Polymeric thickenersSuitable polymeric thickeners for use in the invention include hydrophobically modified alkali swellable emulsion (HASE) copolymers. Exemplary HASE copolymers for use in the invention include linear or crosslinked copolymers that are prepared by the addition polymerization of a monomer mixture including at least one acidic vinyl monomer, such as (meth)acrylic acid (i.e. methacrylic acid and / or acrylic acid); and at least one associative monomer. The term “associative monomer” in the context of this invention denotes a monomer having an ethylenically unsaturated section (for addition polymerization with the other monomers in the mixture) and a hydrophobic section. A preferred type of associative monomer includes a polyoxyalkylene section between the ethylenically unsaturated section and the hydrophobic section. Preferred HASE copolymers for use in the invention include linear or crosslinked copolymers that are prepared by the addition polymerization of (meth)acrylic acid with (i) at least one associative monomer selected from linear or branched C8-C40 alkyl (preferably linear C12-C22 alkyl) polyethoxylated (meth)acrylates; and (ii) at least one further monomer selected from C1-C4 alkyl (meth) acrylates, polyacidic vinyl monomers (such as maleic acid, maleic anhydride and / or salts thereof) and mixtures thereof. The polyethoxylated portion of the associative monomer (i) generally comprises about 5 to about 100, preferably about 10 to about 80, and more preferably about 15 to about 60 oxyethylene repeating units. Mixtures of any of the above-described materials may also be used.The aqueous liquid detergent composition preferably comprises from 0.01 to 5 wt.% of polymeric thickener and more preferably from 0.1 to 3 wt.%, as based on the total weight of the aqueous liquid laundry detergent composition.EnzymesThe detergent composition of the invention may comprise enzyme. Suitable enzymes include lipases, cellulases, peroxidases, proteases (proteolytic enzymes), amylases (amylolytic enzymes) and others. Enzymes may be added in liquid or in encapsulated form. In a preferred embodiment of this invention the enzymes are present in encapsulated form. Suitable levels of each enzyme are from 0.01 to 10 mg, more preferably from 0.2 to 5 mg and even more preferably from 0.3 to 2 mg active enzyme per gram of the composition. Combinations of at least one protease and at least one amylase are especially advantageous.Any enzyme present in the detergent 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 and WO 92 / 19708.Other ingredientsThe liquid detergent preferably does not comprise tocopherols in an amount of from 0.001 to 2 wt. % and more preferably does not comprise 0.001 to 2 wt. % of antioxidants as defined in claim 1 (f) of US2005 / 0130859 A1. These amounts are based on the total weight of the aqueous liquid detergent composition. It was found that such antioxidants are not necessary to include in the liquid detergent of the invention, while still reducing color fading upon exposure to sunlight. Omitting these antioxidants from the detergent simplifies manufacturing.For the same reason the liquid detergent of the invention preferably also does not comprise pearlescent agent as disclosed in US2008 / 0234169. These pearlescent agents are crystalline or glassy solids capable of reflecting and refracting light to produce a pearlescent effect. Such pearlescent agents, and in general pearlescent agents, are not needed and since their inclusion complicates manufacturing. This further reduces simplifies manufacturing.Although not preferred, such tocopherols and pearlescent agents may be present in the aqueous liquid laundry detergent composition according to the invention.SequestrantPreferably the aqueous liquid detergent formulation of the invention contains from 0.1 to 5 wt. %, more preferably from 0.5 to 2 wt. % of sequestrant. Sequestrants may be selected from phosphonates, as sold under the Dequest tradename by Italmatch, for example with Cas-No 2809-21-4, Cas- 22042-96-2 No. Aminopolycarboxylate sequestrants are preferred. Aminopolycarboxylate sequestrants contain 1 or more N atoms, preferably 1 to 2 N atoms and at least 3 COOH, preferably 3 to 4 COOH groups. Preferred examples are ethylenediamine-N,N'-disuccinic acid (EDDS); ethylenediaminetetraacetic acid (EDTA); tetrasodium glutamate diacetate (GLDA); methylglycinediacetic acid (MGDA), diethylenetriaminepentaacetic acid (DTPA), more preferred are MGDA and / or GLDA, and even more preferred is MGDA.MGDA active has the structure (I):[CH3-CH(COO)-N(CH2-COO)2]M3-XHXwherein M is selected from alkali metal cations or quateranary amines, the cations can be the same or different. Preferred are cations of lithium, sodium, potassium, protonated triethanolamine, protonated monoethanoamine or combinations thereof. More preferred are alkali metal cations, and even more preferred are sodium and potassium and combinations of sodium and potassium, x in formula (I) is in the range of from 0 to 1.0, preferred is a range of 0 to 0.5. In a particularly preferred embodiment, x is zero. MGDA active can be partially or preferably fully neutralized with the respective alkali. In a preferred embodiment, an average of from 2.7 to 3.0 COOH groups of MGDA active is neutralized with alkali metal, preferably with sodium. In a particularly preferred embodiment, the MGDA active is a trisodium salt of MGDA of the form:P0001115WG- 28 -MGDA active and its respective alkali metal salts are selected from the racemic mixtures, the D-isomers and the L-isomers, and from mixtures of the D- and L-isomers other than the racemic mixtures. Preferably, the MGDA active is selected from the racemic mixture and from mixtures containing in the range of from 55 to 95 mole % of5 the L-isomer, the balance being D-isomer. Particularly preferred are mixtures containing in the range of from 60 to 80 mole % of the L-isomer, the balance being D- isomer. Other particularly preferred embodiments are racemic mixtures.Preferably the aqueous liquid detergent composition comprises from 0.06 to 5 wt.%, more preferably from 0.08 to 4.5 wt.%, even more preferably from 0.1 to 4.0 wt.%, still even more preferably from 0.5 to 3.5 wt.%, still even more preferably from 0.8 to 3.0 wt.% and still even more preferably from 1.0 to 3.0 wt.% of MGDA active, as based on the total aqueous liquid laundry detergent composition.15 MGDA is commercially available from several companies including Shijiazhuang Jackchem Co., ltd, BASF (Trilon product range) and Nouryon (Dissolvine product range). It was surprisingly found that commercially available MDGA materials may comprise methylglycinemonoacetic acid (MGMA). It was found that MGMA can cause further reduced stability of the liquid detergent upon exposure to sunlight. MGMA has20 the following chemical structure:wherein X is H or a counterion such as Na or an amine.Full purification of MGDA active, to remove the MGMA and other additional chemicals increases manufacturing complexity and introduce technical challenges. It was25 however found that if the MGDA: MGMA active ratio is kept within certain bounds, the negative effects of the additional chemicals in the MGDA material could be controlled.The Mole fraction (ratio) of MGDA to MGMA may be determined by 1 H NMR spectroscopy. The sample is dried, preferably by freeze-drying then fully dissolved in aP0001115WG- 29 - deuterated solvent. The deuterated solvent preferably is D2O or a deuterated alcohol, more preferably deuterated D2O. The integral of the N-CH2- protons are taken from the spectra, in D2O these are at ~3.2ppm for MGDA and ~3.3ppm for MGMA. Peak splitting may occur due to the presence of stereo and optical isomers. The mole5 fraction is given by the equation:Mole fraction = IMGDA / (2*IMGMA) wherein IMGDA is the integral for N-CH2- protons for MGDA active and IMGMA is the integral for N-CH2- protons for MGMA active. IMGMA is multiplied by 2, to account for the fact MGMA has 2 N-CH2- protons compared to 4 for MGDA.Preferably the combined amount of MGDA active and MGMA active is from 0.1 to 20 wt.% more preferably from 0.2 to 15 wt.% even more preferably from 0.4 to 4 wt.% and still even more preferably is from 0.5 to 2.5 wt.%.15The level of MGMA active can be controlled by (partial) purification of the MGDA product and / or by driving the MGDA synthesis reaction to greater completion, with the latter being preferred. For example MGDA may be synthesized by reacting ammonia, methanal and hydrogen cyanide at pH 6 to form iminodiacetonitrile, then placing in a20 strongly acidic medium (pH 1.5) and reacting with ethanal to produce trinitrile methylglycinonitrile- / \ / , / \ / -diacetonitri le. Alkaline hydrolysis then yields trisodium MGDA. An alternative is to produce alaninotrile by a Stecker synthesis with HCN, NH3 and CH3CHO, the alaninotrile is convert to methylglycinonitrile- / \ / , / \ / -diacetonitrile by double cyanomethylation with methanal and hydrogen cyanide, then hydrolyzed with NaOH to25 yield MGDA. Increasing the level of methanal can drive the reaction more to completion, i.e. convert more MGMA to MGDA active in the final product. In doing so additional glycolic acid may be formed in the end-product, which was surprisingly found to have little or no negative stability effects. Preferably the mole fraction of glycolic acid I (MGDA + MGMA) is at least 0.010, more preferably is at least 0.011 to 0.1 and even30 more preferably is from 0.011 to 0.045.The level of MGMA active may also be decreased in the MGDA material by preparative chromatography, such as preparative thin layer chromatography.P0001115WG- 30 -Keeping some level of MGMA active in the MGDA material reduces manufacturing complexity, with little or no negative effect on the colour stability of the detergent. Hence beneficial molar fraction of MGDA / MGMA is from 3.6 to 100, preferably from 3.7 to 50, more preferably from 3.8 to 20, still even more preferably is from 3.9 to 15 and5 still even more preferably is from 4.0 to 10.Transparent containerThe transparent plastic container of the invention has a preferred internal volume of from 0.2 to 5 L, more preferably of from 0.5 to 2.2 L. The detergent product is a multidose liquid contained in a water-insoluble container, preferably a plastic water-insoluble container, such as a bottle.Advantageously the container has a pouring neck with a resealable screw top where the maximum dimension of the pouring neck of the container is at least 3 times smaller15 than the maximum dimension of the container. Preferably the container has a minimum width at it base, of 3 cm, more preferably 4 cm. The width is measured parallel to the flat surface on which the container stands in an upright position.On initial sale the container should be filled to greater than 95% of the container20 capacity by weight. Surprisingly this further reduces the color fading activity upon exposure to sunlight.The container material may be coloured although it should remain at least in part transparent. This can be easily achieved by reducing the amount of colorant in the25 plastic as needed and / or by modifying the container wall thickness. Advantageously the container material contains essentially no added colorant and has no perceivable colour to the untrained human eye.The transparent container made be made from glass, but preferably is made from transparent plastic. It is advantageous that the plastic of the container comprises comprises at least 30 wt.%, preferably at least 50 wt.% and even more preferably at least 80 wt. % of PET plastic, based on the total weight of the plastic of the container.It is advantageous that the plastic of the container comprises comprises at least 20 wt.35 %, preferably at least 30 wt.%, more preferably at least 50 wt.% and even moreP0001115WC- 31 - preferably at least 80 wt. % of recycled PET plastic, based on the total weight of the plastic of the container.The wt. % of recycled plastic can be determined by measuring the tensile strength of5 the plastic. Alternatively, recycled plastics can be distinguished from virgin plastic in various ways as recycled plastic often has polymers of reduced molecular weight and are characterized by the presence of impurities (see Rahimi et. al. “Chemical recycling of waste plastics for new materials production”, Nature Reviews Chemistry”, vol. 1 , Art. No. 0046, 2017).It is considered that a container comprising recycled plastic is more sensitive to colour fading / change of liquid detergent contained therein than would the container comprise only virgin plastic. Hence containers which comprise recycled plastic especially benefit from liquid detergents according to the invention.15Advantageously the plastic of the container contains from 0.01 to 6 wt. %, more preferably from 0.1 to 5 wt. % and even more preferably from 1 to 4.5 wt. % of a UV absorber, based on the total weight of the container plastic. UV absorber is present as additive in the plastic. Advantageous UV absorbers are Cyanoacrylate UV absorbers.20 These are particularly preferred at level from 0.03 to 0.3 wt.%, more preferably from 0.05 to 0.2 wt.%, based on the total weight of the container plastic. Preferred Cyanoacrylate UV absorbers comprise / are diphenylacrylates, more preferably alkyl-2- cyano-3, 3-diphenyl acrylates, where alkyl is a branched or linear saturated alkyl group of molecular weight of less than 120 and even more preferably pentaerythritol25 tetrakis(2-cyano-3,3-diphenylacrylate), 1 ,3-bis-((2’-cyano-3’, 3’-diphenylacryloyl) oxy)-2, 2-bis-(((2’-cyano-3’, 3’-diphenylacryloyl) oxy) methyl)-propane, ethyl-2-cyano-3, 3- diphenyl acrylate, 2-cyano-3,3-diphenyl-2-propenoicaciethylester, 2-ethylhexyl-2- cyano-3,3-diphenylacrylate or mixtures thereof. Cyanoacrylate UV-Absorbers are available from BASF, (Uvinul), Deltachem(QingDao) (Ominstab), MPI Chemie, (UV),30 Shipro Kasei Kaisha (Seesorb).It is considered that cyanoacrylate UV absorbers are especially advantageous for PET- plastic, more preferably recycled PET plastic.P0001115WG- 32 -The transparent plastic container used in the invention is most advantageously in the shape of a bottle.Process5 The detergent product of the invention is preferably made in a process comprising the steps of: a) providing a transparent container according to the invention; and b) providing an aqueous liquid laundry detergent composition according to the invention; and c) filling the container provided at step a) with the aqueous liquid laundry detergent composition provided at step b) to provide the detergent product.It will be appreciated that steps a) and b) can be done in any order.15 The amount of recycled plastic comprised by the transparent plastic container provided at step a) can be determined by determining the wt.% of recycled plastic feed material used, based on the total plastic feed material used, from which the container plastic is made. Plastic containers comprising (or made essentially from) recycled plastic are commercially available and the methods of their manufacture are known in the art.20 Information of recycled plastics as well as their use to make detergent bottles is discussed in the literature, such as in Methods of Recycling, Properties and Applications of Recycled Thermoplastic Polymers. M.E. Grigore, Recycling 2017, 2, 24. Generally, to convert reclaimed post-use plastic into a useable feedstock to manufacture new plastic products, the plastic is washed, dried and suitably pelletized.25 The pelletized recycled plastic can then be optionally mixed with virgin pelletized plastic and subjected to processes to shape it into new plastic products.Processes to convert (pelletized) plastic feed material into final formed plastic products (e.g. detergent bottles) are known in the art. A general description thereof can be found e.g. in Hans-Georg Elias “An introduction to plastics”, 1993. Such techniques include thermoforming, blow molding, injection-molding or injection stretch blow molding. The UV absorber, if present, is preferably added to the (pelletized) plastic feed material, when the plastic feed material is molten, and the UV absorber mixed therewith prior to forming the container.35P0001115WQ- 33 -The provision of the aqueous liquid laundry detergent at step b) can also be done using conventional methods know in the field. The methods may comprise the step of mixing of all ingredients of the composition to provide the aqueous liquid laundry detergent. It was surprisingly found that the aqueous liquid laundry detergent could be5 manufactured with water containing 0.1 to 10 ppm transition metal ions, without negatively affecting the colour stability of the aqueous laundry detergent. Preferred transition metals are iron and copper. It is indeed advantageous to tolerate such levels in the final detergent of the invention as this reduces the complexity of water-quality monitoring systems and / or water purification systems, which simplifies processing.10It will be appreciated that the improved storage stability of the detergent product of the invention allows flexibility in logistics. It may allow energy-efficient central massproduction combined with long-distance international mass distribution which necessitates central accumulation (and prolonged storage times). For example,15 freighter ships can take 10 to 20 days to cross the Atlantic, which does not include time to load I off-load the ship in port. As such preferably the manufacturing process of the product of the invention is a mass-production process providing from 10 to 300 kiloton per year, preferably from 15 to 250 kiloton per year and even more preferably from 20 to 200 kiloton per year and still even more preferably from 30 to 150 kiloton per year.20Preferably the product of the invention is obtainable by the process of the invention.Preferably the process of the invention includes the addition of LAS made by a process involving a hydrogen fluoride catalyst, more preferably wherein the LAS is added in the25 form of a hydrogen fluoride process derived material containing 90 to 99.9 wt.% LAS.In general, commercial LAS raw material is not 100% pure LAS, but contains some level of by-products from the production process. Different processes (e.g. use of hydrogen fluoride catalyst or use of the solid alkylation catalyst) lead to a different by¬30 product composition. These by-products, at least in part, may contribute to the detergent browning and dye-degradation when a liquid laundry detergent is exposed to sunlight, where by-products derived from one LAS production process may be more harmful than those derived from another production process. Removing all these byproducts is however technically challenging.35P0001115WC- 34 -Hence preferred LAS is added in the form of an alkylation catalyst process derived material which contains 90 to 99.9 wt.% LAS containing, more preferably from 92 to 99.5 wt.%, even more preferably from 94 to 99.3 wt.% and even more preferably from 95 to 99.0 wt.% of LAS. The remaining parts of the solid alkylation derived material are5 thus predominantly by-products of the process. By products generally include indans, tetralins, residual Parrafin, water and residual sulphuric acid.Therefore, the invention also preferably relates to a transparent container comprising an aqueous liquid laundry detergent composition wherein the aqueous liquid laundry detergent composition comprises:• from 1 to 50 wt. % of LAS, wherein the LAS comprises at most 18 wt.% of 2-phenyl isomer LAS, based on the total weight of LAS; and• a dye comprising triphenylmethane dye, mono-azo dye, anthraquinone dye or a combination thereof; and15 • from 0.001 to 3 wt.% fragrance; and wherein the container has an internal volume of from 0.1 to 10 L; and wherein the maximum absorbance of the aqueous liquid laundry detergent composition in the range of from 500 to 700nm and as measured at a 1cm pathlength is from 0.02 to 1; and wherein the pH of the aqueous liquid laundry detergent composition when measured at20 20 degrees Celsius is from 5.0 to 7.3, wherein at least 40 wt.% of the LAS is added in the form of a hydrogen fluoride catalyst process derived material containing 90 to 99.9 wt.% LAS.So for example, if the detergent contains 10 wt.% LAS, based on the total weight of the25 detergent, where 50 wt.% of the LAS is added in the form of a hydrogen fluoride catalyst process derived material containing 90 wt.% LAS, the total amount of the process derived material added (LAS raw Material) is (10 * 0.5) 10.9 = 5.5 wt.%.More preferably the amount of LAS added in the form of a hydrogen fluoride catalyst30 process derived material containing 90 to 99.9 wt.% LAS, as based on the total level of the LAS is at least 50 wt.%, even more preferably at least 60 wt.%, still even more preferably at least 70 wt.%, still even more preferably at least 80 wt.% and still even more preferably is from 90 to 100 wt.%.llnless otherwise indicated, preferred aspects in the context of one aspect of the invention (e.g. the transparent container comprising an aqueous liquid laundry detergent composition) are also applicable as preferred aspects in the context of one of the other aspects, (e.g. the process to manufacture the transparent container comprising an aqueous liquid laundry detergent composition) mutatis mutandis.The invention is now illustrated by the following non-limiting examples.ExamplesExample 1An aqueous liquid laundry formulation was provided with a composition according to Table 1. Table 1 : liquid laundry formulation1Amount of LAS added in acid form, which is neutralized in situ. The LAS is produced using a hydrogen fluoride catalyst and has a 2-phenyl isomer LAS content of at most 18 wt.%.P0001115WC- 36 -2A mixture of an ethoxylated zwitterionic polyamine as described in WO2023 / 094275 and a polyester soil release polymer.The formulations of were separated into 500ml aliquots and the pH adjusted to values5 in the range 6.5 (Example 1) and to 7.7 (Comparative A), as measured at 20 degrees Celsius. The LIV-VIS spectra were measured and the optical absorbance (1cm) at the visible absorption maximum of the dye (635nm) recorded. The formulations were place into uncoloured transparent PET plastic bottles wherein the plastic contained a UV- Screen. The bottles were irradiated in a Weatherometer for 24 hours. The light intensity was set at 394 W / m2 (300-800nm). After irradiation the formulation LIV-VIS spectrum was remeasured in a LIV-VIS spectrometer and compared to the unirradiated control.The % residual dye (RD) was calculated as: % RD = 100 x (Abs(A=636)A / Abs(A=636)B])15 Where Abs(A=636)Ais the absorbance (1cm) at wavelength of 636nm after irradiation and Abs(A=636)Bare the values before irradiation.The results are given in Table 2 below:Table 2: Results of residual dye after irradiation.20Table 2 demonstrates that the formulations according to the invention (with LAS, which comprises at most 18 wt.% of 2-phenyl isomer LAS) have improved resistance against dye fading when the pH is controlled to 6.5 (or lower).25 Example 2Example 1 was repeated but with the addition of 1.4 wt.% fragrance to the formulation.The total formulation contained 0.04 wt.% phenol substituted with a CHO group (Vanillin and ethyl Vannillin) as part of the fragrance. The browning of the formulation was measured by measuring the absorbance (at 450nm) after irradiation (See Table 3).30Table 3: Results of browning after irradiation.Table 3 demonstrates that the formulations according to the invention (with LAS, which comprises at most 18 wt.% 2-phenyl isomer LAS) have improved resistance against browning when the pH is controlled to 6.5 (or lower).

Claims

P0001115WC- 38 -Claims1. A transparent container comprising an aqueous liquid laundry detergent composition wherein the aqueous liquid laundry detergent composition comprises:• from 1 to 50 wt. % of linear alkyl benzene sulphonate (LAS), wherein the LAS comprises at most 18 wt.% of 2-phenyl isomer LAS, based on the total weight of LAS; and• a dye comprising triphenylmethane dye, mono-azo dye, anthraquinone dye or a combination thereof; and• preferably from 0.001 to 5 wt.% fragrance; and wherein the container has an internal volume of from 0.1 to 10 L; and wherein the maximum absorbance of the aqueous liquid laundry detergent composition in the range of from 500 to 700nm and as measured at a 1cm pathlength is from 0.02 to 1 ; and wherein the pH of the aqueous liquid laundry detergent composition when measured at 20 degrees Celsius is from 5.0 to 7.3.

2. A transparent container comprising an aqueous liquid laundry detergent composition according to claim 1 , wherein the maximum absorbance of the aqueous liquid laundry detergent composition in the range of from 500 to 700nm and as measured at a 1cm pathlength is from 0.05 to 1 , preferably is from 0.1 to 0.6 and more preferably is from 0.2 to 0.4.

3. A transparent container comprising an aqueous liquid laundry detergent composition according to claim 1 or claim 2, wherein the pH of the aqueous laundry detergent composition when measured at 20 degrees Celsius is from 5.2 to 7.1, preferably from 5.4 to 7.0, more preferably from 5.6 to 6.9, even more preferably from 5.8 to 6.8, still more preferably from 6.0 to 6.7 and still even more preferably from 6.2 to 6.6.

4. A transparent container comprising an aqueous liquid laundry detergent composition according to any preceding claim, wherein the LAS comprises at most 17 wt.%, preferably at most 16 wt.%, more preferably at most 14 wt.%, even more preferably at most 12 wt.% of 2-phenyl isomer LAS, based on the total weight of LAS.

5. A transparent container comprising an aqueous liquid laundry detergent composition according to any preceding claim, wherein the dye comprises an ethoxylated dye and preferably an ethoxylated triphenylmethane dye.

6. A transparent container comprising an aqueous liquid laundry detergent composition according to any preceding claim, wherein the aqueous liquid laundry detergent further comprises hindered phenol antioxidant in an amount of from 0.005 to 0.1 wt.%, preferably of from 0.01 to 0.08 wt.%, more preferably of from 0.015 to 0.06 wt.%, even more preferably of from 0.020 to 0.05 wt.%, still even more preferably of from 0.022 to 0.04 wt.% and still even more preferably of from 0.023 to 0.035 wt.%.

7. A transparent container comprising an aqueous liquid laundry detergent composition according to any preceding claim, wherein the aqueous liquid laundry detergent composition comprises a) from 0.2 to 2 wt.% citric acid, boric acid, their salts or a combination thereof; b) from 0.05 to 4 wt.% triethanolamine; and preferably a combination of a) and b).

8. A transparent container comprising an aqueous liquid laundry detergent composition according to any preceding claim, wherein the fragrance comprises at most 0.3 wt.%, more preferably from 0.002 to 0.2 wt.%, even more preferably from 0.005 to 0.06 wt.%, as based on the total weight of the aqueous liquid detergent composition, of fragrance molecules comprising a phenol moiety substituted with at least one -CHO group.

9. A transparent container comprising an aqueous liquid laundry detergent composition according to anyone of the preceding claims, wherein the container material comprises at least 50 wt.% of plastic, more preferably at least 50 wt.% of polyethylene terephthalate (PET) plastic, as based on the total weight of the container, and even more preferably wherein the PET plastic comprises at least 20 wt. %, preferably at least 30 wt.%, more preferably at least 50 wt.% and even more preferably at least 80 wt. % of recycled polyethylene terephthalate (PET), based on the total weight of the PET plastic of the container.

10. A transparent container comprising an aqueous liquid laundry detergent composition according to anyone of the preceding claims, wherein aqueous liquid laundry detergent composition further comprises from 0.1 to 5 wt.%, as based onP0001115WG- 40 - the total weight of the aqueous liquid laundry detergent composition, of an aminopolycarboxylate sequesterant, preferably of from 0.1 to 5 wt.% of tetrasodium glutamate diacetate (GLDA), methylglycinediacetic acid (MGDA) or a combination thereof and more preferably of from 0.1 to 5 wt.% of MGDA.

11. A transparent container comprising an aqueous liquid laundry detergent composition according to anyone of the preceding claims, wherein the surfactant consists of anionic surfactant, nonionic surfactant or a mixture thereof, wherein LAS is present in an amount of from 1 to 10 wt. % and preferably 2 to 6 wt.%, as based on the total weight of the aqueous liquid laundry detergent composition.

12. A transparent plastic container comprising an aqueous liquid laundry detergent composition according to anyone of the preceding claims, wherein at least 40 wt.%, more preferably at least 50 wt.%, even more preferably at least 60 wt.%, still even more preferably at least 70 wt.%, still even more preferably at least 80 wt.% and still even more preferably from 90 to 100 wt.% of the LAS, based on the total weight of LAS, is added in the form of a hydrogen fluoride catalyst process derived material containing 90 to 99.9 wt.% LAS.

13. A process for the manufacture of a detergent product according to anyone of the preceding claims, wherein the process comprises the steps of: a) providing a transparent container, preferably a container comprising plastic, according to any preceding claim; and b) providing an aqueous liquid laundry detergent composition according to anyone of the preceding; and c) filling the container provided at step a) with the aqueous liquid laundry detergent composition provided at step b) to provide the detergent product; and wherein the process is a mass production process producing from 10 to 300 kilotons per year.

14. A transparent container comprising an aqueous liquid laundry detergent composition according to anyone of the preceding claims obtainable by the process according to claim 13.P0001115WC- 41 -15. Use of a pH of from 5.0 to 7.3 in aqueous liquid laundry detergent compositions as measured at 20 degrees Celsius, to reduce dye fading in the liquid laundry detergents which comprise linear alkyl benzene sulphonate, wherein the LAS comprises at most 18 wt.% of 2-phenyl isomer LAS, based on the total weight of LAS, upon exposure of sunlight.

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