Laundry detergent product

Abstract

A transparent plastic container comprising an aqueous liquid laundry detergent composition wherein the liquid detergent composition comprises: from 5 to 60 wt. % of surfactant; and from 0.05 to 8 wt. % of methyl glycine diacetic acid (MGDA); and from 0.00005 to 0.02 wt. % of a dye comprising an anthraquinone chromophore which contains an amine group or an acid amide group in the 1-position of the anthraquinone ring; and wherein the container has an internal volume of from 0.1 to 10 L; and wherein the plastic of the container comprises from 20 to 100 wt.% polyethylene terephthalate (PET) as based on the total weight of the plastic of the container.

Description

LAUNDRY DETERGENT PRODUCTField of the inventionThe present invention relates to a plastic transparent container comprising an aqueous liquid laundry detergent composition, wherein the aqueous liquid laundry detergent composition comprises an anthraquinone based dye.Background of the inventionPlastics, especially synthetic plastics, are ubiquitous in daily life due to their relatively low production costs and good balance of material properties. Synthetic plastics are used widely to make containers (e.g. bottles) for liquid laundry detergent products. The overwhelming majority of synthetic plastics are produced from increasingly scarce fossil sources, such as petroleum and natural gas. Additionally, the manufacturing of synthetic plastics from fossil sources produces CO2 as a by-product. Plastics recycling has emerged as one solution to mitigate the issues associated with the wide-spread usage of plastics. Reclaiming plastics and re-using reclaimed plastics divert waste from landfills and reduces the demand for virgin plastics made from fossil-based resources, which consequently reduces greenhouse gas emissions and other environmental problems.The recycling process of reclaimed plastic typically consists of sorting the reclaimed plastics into predominately uniform streams of plastic types (e.g. PET, PVC etc...), washing with aqueous and / or caustic solutions and reprocessing into a plastic pellet, which can be used as plastic feed to form new plastic products. On general problem with using plastic feeds derived from recycled plastic is that these often are contaminated with unwanted impurities, such as spoiled food residue, residual perfume and colorants. In particular, reclaimed opaque plastics provide high levels of colorant impurities in the plastic feeds derived from recycled plastic (e.g. dyes and pigments). One way of reducing the level of impurities in the plastic feeds derived from recycled plastic is to decrease the amount of opaque plastic in the reclaimed plastic. Concomitantly there is a need to reduce the amount of opaque plastic in consumer products in favor of transparent (or translucent) plastics, which include plastic transparent containers for storing / transporting / dosing of liquid laundry compositions. Furthermore, transparent containers (e.g. bottles) for liquid laundry products are alsodesired as these allow the consumer to inspect the color of the product, its consistency and any suspended particles if present.As a further consideration, reclaimed plastics based on polyethylene terephthalate (PET) are currently more efficiently and more completely recyclable compared to other types of plastic, such as those based on polyvinyl chloride (PVC), polypropylene (PP), polystyrene (PS) or polymethylmethacrylate (PMMA) (Rahimi et. al. Chemical recycling of waste plastics for new materials production. Nature Reviews Chemistry, 2017, Vol.1 , Art. No. 0046).However, transparent plastic containers, such as made from PET, present problems when used as container for colored aqueous liquid laundry detergent compositions. It was observed that upon exposure to sunlight of such products, the color of the laundry liquid composition tends to fade over time. The transparent plastic containers used to hold colored liquid laundry compositions considered here typically take the form of dispensing-by-pouring bottles and are not to be confused with water-soluble filmwrapped unit-dose products. Such unit dose products are typically packaged in nontransparent (carton-based) boxes and are not typically exposed to sunlight during storage or transport and for which the problem of color fading upon exposure to sunlight is therefore typically not relevant.There remains a continuous need to provide a transparent plastic (dispensing) container, having an internal volume of from 0.1 to 10 L, made from PET, comprising a colored aqueous liquid laundry detergent composition, wherein the fading of the detergent composition upon exposure of the product to sunlight is further reduced.W02021 / 151640 discloses a general solution to the above problem and mentions It was surprisingly observed that use of from 0.00005 to 0.02 wt. % of a dye comprising an anthraquinone chromophore which contains an amine group or an acid amide group in the 1-position of the anthraquinone ring significantly reduces the color fading of the aqueous liquid laundry composition upon exposure to sunlight when combined with from 0.001 to 2 wt. % of sequestrant having a common logarithm Fe3+binding constant of at least 19.0.It is an object of the present invention to improve upon said solution.Summary of the inventionOne or more of the above objects are achieved in a first aspect of the invention by a transparent plastic container comprising an aqueous liquid laundry detergent composition wherein the liquid detergent composition comprises:• from 5 to 60 wt. % of surfactant; and• from 0.05 to 8 wt. % of methyl glycine diacetic acid (MGDA); and• from 0.00005 to 0.02 wt. % of a dye comprising an anthraquinone chromophore which contains an amine group or an acid amide group in the 1 -position of the anthraquinone ring; and wherein the container has an internal volume of from 0.1 to 10 L; and wherein the plastic of the container comprises from 20 to 100 wt.% polyethylene terephthalate (PET) as based on the total weight of the plastic of the container.It was surprisingly observed that use of from 0.00005 to 0.02 wt. % of a dye comprising an anthraquinone chromophore which contains an amine group or an acid amide group in the 1 -position of the anthraquinone ring significantly reduces the color fading of the aqueous liquid laundry composition upon exposure to sunlight when combined with MGDA. It was found that the use of MGDA is superior to that of EDTA to reduce color fading. It is considered that this invention is especially beneficial to containers comprising PET plastic and especially recycled PET plastic.Consumers nowadays have a growing environmental awareness and are more inclined to use aqueous liquid laundry compositions when in plastic containers which are at least in part made from recycled plastics. As such, preferably the plastic material of the transparent plastic container of the invention comprises and more preferably comprises essentially of post-consumer recycled (PCR) plastic. Advantageously the transparent plastic container is marked by one or more symbols, letters and / or numbers identifying the amount of recycled plastic comprised by the transparent plastic container.Moreover, preferably the transparent plastic container is marked by one or more symbols, letters and / or numbers identifying the plastic container is recyclable. The technical benefits afforded by such identifiers is to affect consumer behavior in a manner to reduce the level of impurities in the plastic feeds derived from recycled plastic by decreasing the relative amount of opaque plastic of the reclaimed plastic stream. This concomitantly decreases the world-demand for virgin plastics with all the associated environmental benefits thereof.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 MGDA in a liquid laundry detergent composition to reduce colour fading when stored in a plastic transparent container.Detailed description of the inventionDefinitionsUnless otherwise stated or is made clear from the context, with ‘the composition’ 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". Unless 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.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. 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.Preferably 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 wt.% of MGDA actives and any MGMA actives is based on the equivalent weight of their protonated form (assuming all carboxylate groups as -COOH). Unless otherwise made clear from the context ‘MGDA’ or ‘MGDA material’ refers to MGDA material including any by-products, such as MGMA. ‘MGDA active’ is used as required to refer to the MGDA as specific chemical in the MGDA (material) unless this is already clear from the context. For example, the MGDA (material) can comprise at least 70 wt.% of MGDA active as based on total solids. The amount of MGDA actives based on total solids is especially relevant in the context of MGDA material supplied in dissolved form in which case the MGDA material used can contain further solvent. MGDA can be supplied in both solid and dissolved forms as component to make liquid detergents compositions. When talking about molar fractions of MGDA:MGMA the context clearly refers to molar fractions of the MGDA active: MGMA active.The plastic container of the invention is transparent. The term ‘transparent’ as used herein 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 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) ranging from 0% (no incoming light having passed through the material sample) to 100% (i.e. no difference in light having passed through with and 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 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 liquid detergent is suitably measured in the same way but using a light path-length of 1 cm 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 400 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 %.Dyes comprised by the aqueous liquid laundry detergent compositionThe aqueous liquid laundry detergent composition of the invention comprises a dye comprising an anthraquinone chromophore which contains an amine group or an acidamide 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:Advantageously 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. %.In general, in case of anionic dyes, the wt. % is based on their sodium salt form.Suitable dyes are listed in the Colour index (© Society of Dyers and Colourists & AATCC), preferably under the designation of Acid Green, Acid Blue and Acid violet dyes.The dye of the invention may be alkoxylated, preferably ethoxylated and be covalently bound to a (CH2CH2O)nchain where n is the mole average value and n is from 2 to 8. Preferably the (CH2CH2O)nchain is bound to an amine of the dye.Preferably the dye of the invention comprises one or more of 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 violet 57, Disperse violet 62, Disperse Blue 1, Disperse Blue 3, Disperse Blue 5, Disperse Blue 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 Blue377, 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 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.Preferably the dye of the invention is added to the aqueous liquid laundry detergent in amount to provide an optical density of from 0.05 to 2 and preferably of from 0.1 to 0.5, as measured at the absorption maximum of the dye and using a path-length of 1 cm. The absorption maximum of dyes should be within the range of from 400-700nm.Most preferred dye of the invention are those that provide a violet, blue or green colour (alone or in combination) to the aqueous liquid detergent composition. Advantageously the one or more dyes are violet, blue or green dyes.Shading dyesPreferably the aqueous liquid detergent composition according to the invention further comprises shading dye. Shading dyes provide a shade to white fabric and preferably provide a blue or violet shade to white fabric. In this regard the shading dye gives a blue or violet color to a white cloth with a hue angle of 240 to 330, more preferably 260 to 320, most preferably 265 to 300. The white cloth used is bleached non-mercerised woven cotton sheeting. Preferably a 10 cm by 10 cm piece of white bleached nonmercerised woven cotton cloth is agitated in an aqueous solution (6° French Hard water, liquor 298K: cloth 30:1) 2g / L of a base detergent (10 wt. % linear alkyl benzenesulfonate, 5 wt.% primary alcohol ethoxylate (C12-15, with 7 moles of ethoxy groups), pH=8) for 30 minutes at room temperature. The cloths are removed, rinsed and tumble dried. The experiment is repeated with and without the addition of shading dye. The color of the cloth is measured using a reflectometer and expressed as the CIE L*a*b* values. The experiment was repeated with the addition of 0.001 wt. % of the dye to the formulation.The total color added to the cloth was calculated as the AE value, such that AE = (AL2+ Aa2+ Ab2)05where AL = L(control)-L(dye); Aa = a(control)-a(dye); Ab = b(control)-b(dye)The actual color of the cloth was calculated as the hue angle, which for the current range of colors is given by: Hue angle = 270+180 / TT X atan(-Aa / Ab) A hue angle of 360 / 0 is red, 270 is blue and 180 is green.A shading dye according to the invention is a shading dye which means it is able to deposit onto textile during domestic wash conditions in the presence of a wash liquor comprising surfactant. This may be assessed using the above test, where a shading dye will give a non-zero AE value.The shading dye preferably contains a chromophore selected from the following chromophore classes: anthraquinone, azo, oxazine, azine, triphenodioxazine, triphenyl methane, xanthene and phthalocyanin, more preferably azo and anthraquinone most preferably mono-azo or bis-azo. Preferably the shading dye chromophore is a monoazo or bis-azo dye, ethoxylated mono azo thiophene dye, solvent violet 13, disperse violet 28, direct violet 9, direct violet 99, direct violet 35, acid violet 50 or combinations thereof.MGDAMGDA active has the structure (I):[CH3-CH(COO)-N(CH2-COO)2]M3-XH (I) wherein 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 three 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: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 % of 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 laundry container 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.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 has the following chemical structure:xoocwherein 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 was 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 a 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 mole 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.%.The 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 a 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-ZV, / V-diacetonitrile by double cyanomethylation with methanal and hydrogen cyanide, then hydrolyzed with NaOH to 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 even 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.Keeping some level of MGMA active in the MGDA material reduces manufacturing complexity, with little or no negative effect on the color 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 and still even more preferably is from 4.0 to 10.SurfactantThe liquid detergent of the invention preferably comprises from 2 to 60 wt. % of surfactant, more preferably from 3 to 50 wt. % and even more preferably from 4 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 nonionic and anionic surfactants of the surfactant system may be 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.Anionic surfactants are discussed in the Anionic Surfactants: Organic Chemistry edited by Helmut W. Stache (Marcel Dekker 1995), Surfactant Science Series published byCRC press. Preferred anionic surfactants are sulfonate and sulfate surfactants, 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 compositions C12-C14 alkyl ether sulfates having a straight or 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.LAS (linear alkyl benzene sulphonate) is a preferred anionic surfactant.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. Preferably, linear alkyl benzene sulphonate surfactant is present at from 1 to 20% wt., more preferably from 2 to 15% wt. of the composition, most preferably 8 to 12 wt.%.The 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 asmono-, 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 surfactantNonionic 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 alkoxylate, preferably ethoxylated, Preferred non-ionic surfactant are alcohol ethoxylates and methyl ester ethoxylates, 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. 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.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 catalystare 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 Series Volume 72, CRC Press.Ethoxy units may be partially replaced by propoxy units in anionic and non-ionic surfactants.The liquid detergent preferably comprises from 1 to 5 wt.% ethanol.£HPreferably the aqueous liquid laundry detergent has a pH from 5 to 9, preferably from 6 to 8, as measured at 293K.Fluorescent AgentThe liquid detergent preferably comprises a fluorescent agent (also 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. %. 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 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.PerfumeThe liquid detergent of invention preferably comprises one or more perfumes. Perfume may be present in the range from 0.1 to 1 wt. %. Many suitable examples of perfumes are provided in the CTFA (Cosmetic, Toiletry and Fragrance Association) 1992International 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.Preferably the perfume contains a substituted benzaldehyde where the substitution is preferably at the at the 3,4 or 5 position, more preferably the substituent is an alkoxy group. Preferably the benzaldehyde is selected from 4-Methoxybenzaldehyde, 5- Methoxybenzaldehyde, 3- Methoxybenzaldehyde, 4-Ethoxybenzaldehyde, 5- Ethoxybenzaldehyde, 3- Ethoxybenzaldehyde. Preferably the benzaldhyde is present at from 0.5 to 5wt% of the perfume.Particularly preferred perfume components are selected from verdyl acetate; verdyl propionate; or tert butyl cyclohexyl acetate; tetrahydro linalool; bornyl acetate; bornyl propionate; dihydromyrcenol; hexyl salicylate, Tetramethyl acetyloctahydronaphthalenes; eucalyptol; 2-methyl undecanal; citronellol; geraniol; benzyl acetate; (E)-4-methyldec-3-en-5-ol.Preferably the perfume contains at least 6 of these components, more preferably each at a level of at least 0.01wt% in the detergent product.T ricyclodecenyl based perfumes are verdyl acetate; verdyl propionate; bornyl acetate and bornyl propionate. The sum of the weights of verdyl acetate; verdyl propionate; bornyl acetate and bornyl propionate, will be called Tricyclodecenyl sum. Tert butyl cyclohexyl acetate is preferably ortho tert butyl cyclohexyl acetate or para tert butyl cyclohexyl acetate.Preferably the perfume contains at least 4, more preferably at least 5 components selected from a tricyclodecenyl perfume; tert butyl cyclohexyl acetate; dihydromyrcenol; Tetramethyl acetyloctahydronaphthalenes; hexyl salicylate; tetrahydrolinalool.Preferably the weight ratio of Tricyclodecenyl sum: tert butyl cyclohexyl acetate: dihydromyrcenol is selected from 30 to 40 : 20 to 30: 10 to 20 for long lasting perfumes and 5 to 15 : 20 to 30 : 35 to 50 for freshness perfumes.Preferably the weight ratio of Tetramethyl acetyloctahydronaphthalenes : hexyl salicylate is from 5 to 15 : 10 to 16.Preferably the weight fraction of dihydromyrcenol / hexyl salicylate is from 0.5 to 6.0, more preferably from 1.0 to 3.0.Alkoxyated polyamine polymerThe 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 hydrolysed, at least one, preferably all of the hydrolysed 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:Where 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 OH and SOs" 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. There is 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), 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.% of the 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 ofpoly(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; and polyester-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%.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, WO 2007 / 079850 and W02016 / 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 liquid detergent preferably comprises from 0.01 to 5 wt.% of polymeric thickener and more preferably from 0.1 to 3 wt.%.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 antioxidant as defined in claim 1 (f) of US2005 / 0130859 A1. 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 anti-oxidants from the detergent reduces the ingredient list length and 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 are not needed and since their inclusion complicates manufacturing. This further reduces the ingredient list length and simplifies manufacturing.Although not preferred, such tocopherols and pearlescent agents may be present in the aqueous liquid laundry detergent according to the invention.Form of the transparent plastic 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 none water-soluble plastic container.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 smaller 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 container capacity by weight. Surprisingly this further reduces the color fading activity upon exposure to sunlight.The plastic of the container may be coloured although it should remain at least in part transparent. This can be easily achieved by reducing the amount of colorant in the plastic as needed and / or by modifying the container wall thickness. Advantageously the plastic of the container contains essentially no added colorant and has no perceivable colour to the untrained human eye.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. %, preferably at least 30 wt.%, more preferably at least 50 wt.% and even more 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 of 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 recyclingof 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 color fading 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.Advantageously 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. 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 pentaerythritol 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), Shipro Kasei Kaisha (Seesorb).It is considered that cyanoacrylate UV absorbers are especially advantageous for PET- plastic, more preferably recycled PET plastic.The transparent plastic container used in the invention is most advantageously in the shape of a bottle.ProcessThe detergent product of the invention is preferably made in a process comprising the steps of: a) providing a plastic transparent container according to the invention; andb) 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.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. 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. 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.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 be 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 levelsin the final detergent of the invention as this reduces the complexity of water-quality monitoring systems and / or water purification systems, which simplifies processing.It 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, 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.Preferably the product of the invention is obtainable by the process of the invention.Unless otherwise indicated, preferred aspects in the context of one aspect of the invention (e.g. the transparent plastic 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 plastic container comprising an aqueous liquid laundry detergent composition; e.g. the liquid laundry detergent wherein MGDA is used to reduce color fading) mutatis mutandis.The invention is now illustrated by the following non-limiting examples.ExamplesLiquid laundry formulations were prepared as set out in Table 1 below. Example 1 is a detergent formulation according to the invention. Comparative formulations A and B are detergent formulations not according to the invention.Table 1: detergent formulations. Amounts are given in wt. %, unless otherwise indicated.2An ethoxylated anthraquinone dye of structure was added to the formulation to give an optical absorbance of 0.65 (1cm) at the maximum absorbance of the dye (646nm).The dye had the following structure:To simulate transition metals found in factory water reproducibly CuSO4 and FeSO4 was added to give 0.8ppm Cu(ll) and 0.7ppm Fe(ll).The LIV-VIS spectrum of the formulations were measured in a 1cm cell (cuvette). The formulations were irradiated in 20ml glass bottle in a weatherometer for 48 hours to simulate outdoor Florida sunlight. The light intensity was set at 394 W / m2 (300- 800nm). After irradiation the formulation LIV-VIS spectrum was measured in a LIV-VIS spectrometer and compared to a control irradiated without added sequestrant.The % dye remaining was calculated as:%dye remaining = 100* (Aafter / Abefore) where Aafteris the absorbance of the dye at 646nm after irradiation and Abefore is the absorbance of the dye at 646nm after irradiation. The results are given in Table 2 below.Table 2: Results of colour fading of the liquid detergent in the bottleThe experiments as set out above mimic exposure of the detergent products to sunlight. The results show that use of an aqueous liquid laundry detergent according to the invention results in less fading of the detergent when using MGDA.

Claims

Claims1. A transparent plastic container comprising an aqueous liquid laundry detergent composition wherein the liquid detergent composition comprises:• from 5 to 60 wt. % of surfactant; and• from 0.05 to 8 wt. % of methyl glycine diacetic acid (MGDA); and• from 0.00005 to 0.02 wt. % of a dye comprising an anthraquinone chromophore which contains an amine group or an acid amide group in the 1-position of the anthraquinone ring; and wherein the container has an internal volume of from 0.1 to 10 L; and wherein the plastic of the container comprises from 20 to 100 wt.% polyethylene terephthalate (PET) as based on the total weight of the plastic of the container.

2. A transparent plastic container comprising an aqueous liquid laundry detergent composition according to claim 1 , wherein the dye provides, alone or in combination, a violet, blue or green colour to the aqueous liquid detergent composition, preferably wherein the one or more dyes are violet, blue or green dyes.

3. A transparent plastic container comprising an aqueous liquid laundry detergent composition according to claim 1 or claim 2, wherein the amount of the dye is from 0.0001 to 0.01 wt. %, preferably from 0.0001 to 0.005 wt. %.

4. A transparent plastic container comprising an aqueous liquid laundry detergent composition according to anyone of the preceding claims, wherein the dye comprises one or more of 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 violet 57, Disperse violet 62, Disperse Blue 1, Disperse Blue 3, Disperse Blue 5, Disperse Blue 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 ; and preferably one or more of Acid green 25, Acid blue 80, solvent Violet 13, Disperse Violet 28 and Acid Violet 43.

5. A transparent plastic container comprising an aqueous liquid laundry detergent composition according to anyone of the preceding claims, wherein the amount of MGDA active is from 0.06 to 5 wt.%, preferably from 0.08 to 4.5 wt.%, more preferably from 0.1 to 4.0 wt.%, 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.%.

6. A transparent plastic container comprising an aqueous liquid laundry detergent composition according to anyone of the preceding claims, wherein the MGDA material has a molar fraction of MGDA / MGMA of 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 and still even more preferably is from 4.0 to 10, wherein MGMA means methylglycine monoacetic acid.

7. A transparent plastic 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 and preferably consists of a mixture of anionic and nonionic surfactant.

8. A transparent plastic container comprising an aqueous liquid laundry detergent composition according to anyone of the preceding claims, wherein the plastic of the container 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 plastic of the container.

9. A transparent plastic container comprising an aqueous liquid laundry detergent composition according to anyone of the preceding claims, wherein the plastic of the container comprises from 0.01 to 6 wt. %, preferably from 0.1 to 5 wt. % and morepreferably from 1 to 4.5 wt. % of UV absorber, based on the total weight of the container plastic.

10. A transparent plastic container comprising an aqueous liquid laundry detergent composition according to claim 9, wherein the UV absorber comprises from 0.03 to 0.3 wt.% and preferably from 0.05 to 0.2 wt.% cyanoacrylate UV absorbers based on the weight of the container plastic, wherein the cyanoacrylate UV absorbers comprise, preferably 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 pentaerythritol 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.

11. A transparent plastic container comprising an aqueous liquid laundry detergent composition according to anyone of the preceding claims, wherein the detergent comprises from 0.5 to 5 wt.% of substituted benzaldehyde where the substitution is preferably at the at the 3,4 or 5 position, preferably wherein the substituent is an alkoxy group.

12. A transparent plastic container comprising an aqueous liquid laundry detergent composition according to anyone of the preceding claims, wherein at least 30 %, preferably at least 50%, more preferably at least 70% and even more preferably at least 85 % of the outer container surface is transparent.

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 plastic transparent container 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; andwherein the process is a mass production process producing from 10 to 300 kilotons per year.

14. A transparent plastic container comprising an aqueous liquid laundry detergent composition according to anyone of the preceding claims obtainable by the process according to claim 13.

15. Use of MGDA in a liquid laundry detergent composition to reduce colour fading when stored in a plastic transparent container.

Images