Laundry detergent product

Abstract

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

Description

[0001] Invention Field The present invention relates to a transparent plastic container comprising an aqueous liquid laundry detergent composition, wherein the aqueous liquid laundry detergent composition comprises anthraquinone-based dye. Background of the Invention Plastics, especially synthetic plastics, are ubiquitous in daily life due to their relatively low production costs and good balance of material properties. Synthetic plastics are widely used in the manufacture of containers (e.g., bottles) for liquid laundry detergent products. The vast majority of synthetic plastics are produced from increasingly scarce fossil resources, such as oil and natural gas. Furthermore, the production of synthetic plastics from fossil resources generates CO2 as a byproduct. Plastic recycling has emerged as a solution to alleviate the problems associated with the widespread use of plastics. Recycling and reusing recycled plastics can divert waste from landfills and reduce the demand for virgin plastics made from fossil-based resources, thereby reducing greenhouse gas emissions and other environmental problems.

[0003] The recycling process for recycled plastics typically involves sorting the recycled plastics into streams of substantially homogeneous plastic types (such as PET, PVC, etc.), washing them with aqueous and / or caustic alkali solutions, and reprocessing them into plastic pellets, which can be used as raw materials to form new plastic products. A common problem with using plastic raw materials derived from recycled plastics is that they are often contaminated with unwanted impurities such as spoiled food residue, residual fragrances, and colorants. In particular, recycled opaque plastics provide high levels of colorant impurities (e.g., dyes and pigments) in plastic raw materials derived from recycled plastics. One way to reduce the impurity content in plastic raw materials derived from recycled plastics is to reduce the amount of opaque plastic in the recycled plastics. Consequently, there is a need to reduce the amount of opaque plastic in consumer products and favor transparent (or translucent) plastics, including transparent plastic containers for storing / transporting / dosing liquid laundry compositions. Furthermore, transparent containers (e.g., bottles) for liquid laundry products are also ideal because they allow consumers to inspect the product's color, consistency, and any suspended particles (if present).

[0004] As a further consideration, recycled plastics based on polyethylene terephthalate (PET) are currently more efficient and complete to recycle than other types of plastics such as those based on polyvinyl chloride (PVC), polypropylene (PP), polystyrene (PS), or polymethyl methacrylate (PMMA) (Rahimi et al., Chemical recycling of waste plastics for new materials production. Nature Reviews Chemistry, 2017, Vol. 1, Art.No. 0046).

[0005] However, transparent plastic containers (such as those made of PET) present problems when used as containers for colored liquid laundry detergent compositions. It has been observed that the color of these liquid laundry compositions tends to fade over time when exposed to sunlight. The transparent plastic containers considered here for containing colored liquid laundry compositions are typically in the form of dispensing-by-pouring bottles and are not to be confused with unit-dose products wrapped in water-soluble films. Such unit-dose products are usually packaged in opaque (cardboard-based) boxes and are generally not exposed to sunlight during storage or transport; therefore, the problem of fading upon exposure to sunlight is generally unrelated to this.

[0006] There remains a persistent demand for transparent plastic (dispensing) containers made of PET with an internal volume of 0.1-10 liters containing colored aqueous liquid laundry detergent compositions, wherein the detergent compositions are further reduced from fading when the product is exposed to sunlight.

[0007] WO2021 / 151640 discloses a general solution to the above problem and mentions the surprising observation that using 0.00005 to 0.02 wt% of a dye containing an anthraquinone chromophore at the 1-position of the anthraquinone ring with an amino or amide group, when combined with 0.001 to 2 wt% of a commonly used Fe ratio of at least 19.0, 3+ When bound by a chelating agent with a binding constant, the fading of aqueous liquid laundry compositions exposed to sunlight is significantly reduced.

[0008] The purpose of this invention is to improve the solution described above. Invention Overview In a first aspect of the invention, one or more of the above-mentioned objectives are achieved by a transparent plastic container comprising an aqueous liquid laundry detergent composition, wherein the liquid detergent composition comprises: • 5 to 60% by weight of surfactant; and • 0.05 to 8% by weight of methylglycine diacetic acid (MGDA); and • 0.00005 to 0.02% by weight of a dye containing an anthraquinone chromophore, wherein the anthraquinone chromophore contains an amino or amide group at the 1-position of the anthraquinone ring; and The containers have an internal volume of 0.1 to 10 liters; and The plastic of the container contains 20 to 100% by weight of polyethylene terephthalate (PET) based on the total weight of the container plastic.

[0010] Surprisingly, it was observed that using 0.00005 to 0.02% by weight of anthraquinone chromophores containing an amino or amide group at the 1-position of the anthraquinone ring, when combined with MGDA, significantly reduced the fading of aqueous liquid laundry compositions upon exposure to sunlight. It was found that the use of MGDA was superior to the use of EDTA in reducing fading. This invention is considered particularly advantageous for containers containing PET plastics, especially recycled PET plastics.

[0011] Today, consumers are increasingly environmentally conscious and prefer aqueous liquid laundry compositions housed in plastic containers that are at least partially made from recycled plastic. Therefore, the plastic material of the transparent plastic container of the present invention preferably comprises post-consumer recycled (PCR) plastic and more preferably consists substantially of it. Advantageously, the transparent plastic container is marked with one or more symbols, letters, and / or numbers indicating the amount of recycled plastic contained within it. Furthermore, the transparent plastic container is preferably marked with one or more symbols, letters, and / or numbers indicating that it is recyclable. The technical benefit provided by such identifiers is to influence consumer behavior by reducing the relative amount of opaque plastic in the recycled plastic stream, thereby reducing the level of impurities in the plastic feed derived from recycled plastic. This, in turn, reduces the world's demand for virgin plastics and all the associated environmental benefits.

[0012] In a second aspect, the present invention relates to a method for manufacturing a detergent product according to the first aspect of the present invention.

[0013] In a third aspect, the present invention relates to the use of MGDA in liquid laundry detergent compositions for reducing fading when stored in transparent plastic containers. Invention Details definition Unless otherwise stated or clearly indicated from the context, "composition" means the aqueous liquid laundry detergent composition itself, excluding the container; "container" means the transparent plastic container itself, excluding the aqueous liquid laundry detergent composition; and "product" means the transparent plastic container plus the aqueous liquid laundry detergent composition contained therein. Weight percentages (%) are based on the total weight of the aqueous liquid laundry detergent composition, container, or product, as indicated or clearly indicated in the context. It should be understood that the total weight of the ingredients does not exceed 100% by weight.

[0015] Unless otherwise stated, whenever the amount or concentration of a component is quantified herein, the quantified amount or concentration relates to the component itself, even if it is typically added as a solution or in blend with one or more other components. It should also be understood that the verb “comprising” and its variations are used in their non-limiting sense to include the item following the word, but do not exclude items not specifically mentioned. Finally, the use of the indefinite article “a” or “an” to refer to an element does not exclude the possibility of more than one element, unless the context explicitly requires one and only one element. The indefinite article “a” or “an” generally means “at least one”. Unless otherwise stated, all measurements are performed under standard conditions. Whenever a parameter such as concentration or ratio is stated to be less than a certain upper limit, it should be understood that, in the absence of a specified lower limit, the lower limit of the parameter is 0.

[0016] In the context of this invention, the term "liquid" means that the continuous phase or main component of a detergent is liquid, and the composition is flowable at 15 degrees Celsius or higher. Therefore, the term "liquid" can encompass emulsions, suspensions, and compositions having a flowable but firmer consistency, such as gels. At 25 degrees Celsius and a shear rate of 21 seconds... -1 In this case, the viscosity of the detergent is preferably from 200 to about 10,000 mPa·s. This shear rate is the shear rate typically applied to the liquid when poured from the bottle. Pourable liquid detergents preferably have a viscosity of 200 to 1,500 mPa·s, more preferably 200 to 700 mPa·s.

[0017] Preferably, the liquid detergent of the present invention is water-based, meaning it contains at least 10% by weight of water. Preferably, the composition contains at least 40% by weight, more preferably 50% by weight, even more preferably 60% by weight of water, and even more preferably at least 70% by weight of water.

[0018] The weight percentage of MGDA active material and any MGMA active material is based on the equivalent of its protonated form (assuming all carboxylic acid groups are -COOH). Unless the context clearly indicates otherwise, "MGDA" or "MGDA material" refers to MGDA material that includes any byproducts such as MGMA. "MGDA active material" is used as needed to refer to MGDA as a specific chemical in MGDA (material), unless it is clear from the context. For example, MGDA (material) may contain at least 70% by weight of MGDA active material based on total solids. The amount of MGDA active material based on total solids is particularly relevant in the case of MGDA material supplied in dissolved form, in which case the MGDA material used may contain further solvent. MGDA may be provided in both solid and dissolved forms as a component in the preparation of liquid detergent compositions. When referring to the molar fraction of MGDA:MGMA, the context clearly refers to the molar fraction of MGDA active material:MGMA active material.

[0019] The plastic container of the present invention is transparent. As used herein, the term "transparent" refers to the ability of light in the visible spectrum (400-700 nm) to pass through the container wall. Transparency can be quantified as the ratio of the light intensity measured after light has passed through a material sample to the light intensity measured after the material sample has been removed. This ratio can be converted into a percentage transmittance ranging from 0% (no incident light passes through the material sample) to 100% (i.e., there is no difference in light passing through with and without a material sample) (by multiplying the ratio by 100). As used herein, the term "transparent" means a transmittance of at least 10%, preferably at least 20%, 30%, 40%, 50%, 60%, 70%, 80%, and even more preferably at least 90% in the wavelength range of 400 to 700 nm.

[0020] Preferably, at least 30%, 50%, 70%, and even more preferably at least 85% of the total external container surface area is transparent. This is preferably determined when taking into account externally applied labels and / or stickers. The transmittance of the container material can be suitably measured using a UV-VIS spectrophotometer, preferably based on the optical path length through 1 mm of plastic. Suitable UV-VIS spectrophotometers are available from several suppliers, including Thermo Scientific, Perkin Elmer, and Shimadzu.

[0021] The transparency of the liquid detergent is appropriately measured in the same manner, but the measurement is standardized using a 1 cm optical path length. The transparency of the liquid is typically determined using cuvettes, where the transmittance of the liquid is based on the ratio (x100) between a cuvette containing the liquid detergent and an empty cuvette. Suitable cuvettes are usually specified in the supplier's instructions for the UV-VIS spectrophotometer. The liquid detergent preferably has an average transmittance of at least 20% based on a 1 cm optical path length in the wavelength range of 400-700 nm. More preferably, the transmittance is at least 30%, even more preferably at least 50%, and still even more preferably at least 70%. Obviously, since the liquid is colored, the average transmittance at visible wavelengths is less than 100%, preferably at most 90%, and even more preferably at most 80%.

[0022] Labels carrying product information can be applied to the outer surface of a transparent container. Advantageously, the label is partially opaque to improve the readability of any information on it. The application of such labels is to convey information about the product to consumers, some of which is legally or regulatoryly required. The label can be applied as a heat-shrink sleeve, a suitable sticker, or any other suitable method. Advantageously, the label (if present) is thin, meaning it has a thickness of 0.01 to 2 mm, and is itself made of recyclable plastic. More preferably, the label does not reduce the transparent surface area of ​​the plastic transparent container by more than 50%, preferably no more than 30%, and even more preferably no more than 20%.

[0023] The dye contained in the aqueous liquid laundry detergent composition The aqueous liquid laundry detergent composition of the present invention comprises a dye containing an anthraquinone chromophore, wherein the chromophore contains an amino or amide group at the 1-position of the anthraquinone ring. The general structure of the anthraquinone dye having the indicated ring position is given by the following structure: Advantageously, the amount of the anthraquinone dye of the present invention in the aqueous liquid laundry composition of the present invention is 0.0001 to 0.01% by weight, more preferably 0.0001 to 0.005% by weight.

[0024] Typically, in the case of anionic dyes, weight percent is based on their sodium salt form.

[0025] Suitable dyes are listed in the Color Index (© Society of Dyers and Colourists & AATCC), preferably named after Acid Green, Acid Blue, and Acid Violet dyes.

[0026] The dyes of the present invention may be alkoxylated, preferably ethoxylated, and covalently bonded to (CH2CH2O). nA chain, wherein n is the molar average value, and n is 2 to 8. Preferably, (CH2CH2O) n Amines that are chain-bonded to dyes.

[0027] Preferably, the dyes of the present invention comprise 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 Blue 34, 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, and 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, 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, or one or more of these. The dye name refers to the Colour Index™ Generic Name published by the Society of Dyers and Colourists (SDC) and the American Association of Textile Chemists and Colourists (AATCC). Among the dyes mentioned above, Acid Green 25, Acid Blue 80, Solvent Violet 13, Disperse Violet 28, and Acid Violet 43, or combinations thereof, are particularly preferred.

[0028] Advantageously, the dyes of the present invention are sulfonated, and in this sense, more preferred dyes are 1-aminoanthraquinone-2-sulfonic acid, diaminodihydroxyanthraquinone sulfonic acid, and 1,4-diaminoanthraquinone having an external sulfonic acid group, as described in Industrial Dyes: Chemistry, Properties, Applications (Wiley-VCH 2003) edited by Klaus Hunger.

[0029] Preferably, the dye of the present invention is added to an aqueous liquid laundry detergent in an amount providing an optical density of 0.05 to 2, preferably 0.1 to 0.5, wherein the optical density is measured at the point of maximum absorption of the dye using an optical path length of 1 cm. The maximum absorption of the dye should be in the range of 400-700 nm.

[0030] The most preferred dyes of this invention are those that provide purple, blue, or green (alone or in combination) for aqueous liquid detergent compositions. Advantageously, one or more dyes are purple, blue, or green dyes.

[0031] Toning dyes Preferably, the aqueous liquid detergent composition according to the invention further comprises a tinting dye. The tinting dye provides a hue to white fabric, preferably a blue or purple hue. In this respect, the tinting dye imparts blue or purple to the white fabric with a hue angle of 240 to 330, more preferably 260 to 320, and most preferably 265 to 300. The white fabric used is a bleached, non-mercerized woven cotton sheet. Preferably, a 10 cm × 10 cm white bleached, non-mercerized woven cotton sheet is prepared in an aqueous solution (6 g / L) of a 2 g / L base detergent (10 wt% linear alkylbenzene sulfonate, 5 wt% primary alcohol ethoxylate (C12-15, having 7 moles of ethoxy), pH=8). o Stir the fabric in French hardness water (liquid 298K:cloth 30:1) at room temperature for 30 minutes. Remove the fabric, rinse, and dry. Repeat the experiment with and without tinting dye. Measure the fabric color using a reflectometer and express it as CIE L. a b Value. Repeat the experiment by adding 0.001% by weight of dye to the formulation.

[0032] The total color added to the fabric is calculated as a ΔE value, such that... ΔE = (ΔL 2 + Δa 2 + Δb 2 ) 0.5 Where ΔL = L (control) - L (dye); Δa = a (control) - a (dye); Δb = b (control) - b (dye) The actual color of the fabric is calculated as the hue angle, which is given by the following formula for the current color range: Hue angle = 270 + 180 / π × atan (-Δa / Δb) The hue angle of 360 / 0 is red, 270 is blue, and 180 is green.

[0033] The tinting dye according to the invention means a tinting dye that can be deposited on textiles under household washing conditions in the presence of a detergent containing a surfactant. This can be evaluated using the test described above, where the tinting dye gives a non-zero ΔE value.

[0034] The tinting dye preferably contains a chromophore selected from the following categories: anthraquinone, azo, oxazine, azazine, triphenyldioxazine, triphenylmethane, oxanthracene, and phthalocyanine; more preferably, azo and anthraquinone; and most preferably, monoazo or diazo. Preferably, the chromophore of the tinting dye is a monoazo or diazo dye, an ethoxylated monoazothiophene dye, solvent violet 13, disperse violet 28, direct violet 9, direct violet 99, direct violet 35, acid violet 50, or a combination thereof.

[0035] MGDA The active substance of MGDA has the structure (I): [CH3-CH(COO)-N(CH2-COO)2]M 3-x H x (I) M is selected from alkali metal cations or quaternary ammonium cations, which may be the same or different. Preferably, it is a cation of lithium, sodium, potassium, protonated triethanolamine, protonated monoethanolamine, or a combination thereof. More preferably, it is an alkali metal cation, and even more preferably, it is sodium and potassium, or a combination of sodium and potassium. x in formula (I) is in the range of 0 to 1.0, preferably in the range of 0 to 0.5. In a particularly preferred embodiment, x is zero. The MGDA active material can be partially or preferably completely neutralized with a corresponding base. In a preferred embodiment, the average 2.7 to 3 COOH groups of the MGDA active material are neutralized with an alkali metal, preferably sodium. In a particularly preferred embodiment, the MGDA active material is the trisodium salt of MGDA in the following form: The MGDA active material and its corresponding alkali metal salt are selected from racemic mixtures, D-isomers, and L-isomers, as well as mixtures of D-isomers and L-isomers other than racemic mixtures. Preferably, the MGDA active material is selected from racemic mixtures and mixtures containing 55 to 95 mol% of L-isomers, with the remainder being D-isomers. Particularly preferred are mixtures containing 60 to 80 mol% of L-isomers, with the remainder being D-isomers. Other particularly preferred embodiments are racemic mixtures.

[0036] Preferably, the aqueous liquid washing container contains 0.06 to 5% by weight, more preferably 0.08 to 4.5% by weight, even more preferably 0.1 to 4.0% by weight, even more preferably 0.5 to 3.5% by weight, even more preferably 0.8 to 3.0% by weight and even more preferably 1.0 to 3.0% by weight of MGDA active material.

[0037] MGDA is available from several companies, including Shijiazhuang Jackchem Co., Ltd., BASF (Trilon product line), and Nouryon (Dissolvine product line). Surprisingly, commercially available MDGA materials may contain methylglycine monoacetic acid (MGMA). It has been found that MGMA can further reduce the stability of liquid detergents upon exposure to sunlight. MGMA has the following chemical structure: Where X is H or a counterion such as Na or an amine.

[0038] The complete purification of MGDA active material to remove MGMA and other additional chemicals increases manufacturing complexity and introduces technical challenges. However, it has been found that the negative impacts of additional chemicals in MGDA materials can be controlled if the MGDA:MGMA active material ratio is kept within certain limits.

[0039] The molar fraction (ratio) of MGDA to MGMA can be determined by 1H NMR spectroscopy. The sample is dried, preferably by freeze-drying, and then completely dissolved in a deuterated solvent. The deuterated solvent is preferably D₂O or a deuterated alcohol, more preferably deuterated D₂O. The integral of the N-CH₂- protons is obtained from the NMR spectrum, showing approximately 3.2 ppm for MGDA and approximately 3.3 ppm for MGMA in D₂O. Peak splitting may occur due to the presence of stereoisomers and optical isomers. The molar fraction is given by the following formula: mole fraction = I MGDA / (2 I MGMA ) For MGMA active substances, I MGDA It is the integral of the N-CH2- proton of the MGDA active substance, and I MGMA The integral of the N-CH2- proton. I MGMA Multiply by 2 to account for the fact that MGMA has 2 N-CH2-protons, while MGDA has 4.

[0040] Preferably, the combined amount of MGDA active material and MGMA active material is 0.1 to 20% by weight, more preferably 0.2 to 15% by weight, even more preferably 0.4 to 4% by weight, and even more preferably 0.5 to 2.5% by weight.

[0041] The level of the active MGMA can be controlled by (partially) purifying the MGDA product and / or by driving the MGDA synthesis reaction more completely, the latter being preferred. For example, it can be achieved by reacting ammonia, formaldehyde, and hydrogen cyanide at pH 6 to form iminodiacetonitrile, followed by reaction in a strongly acidic medium (pH 1.5) with acetaldehyde to generate trinitrile methylglycine nitrile. N,N MGDA is synthesized from diacetonitrile. Then, alkaline hydrolysis yields trisodium MGDA. An alternative is to produce alanine nitrile via Stecker synthesis using HCN, NH3, and CH3CHO, which is then converted to methylglycine nitrile via double cyanomethylation with formaldehyde and hydrogen cyanide. N,N -Diacetonitrile, then hydrolyzed with NaOH to obtain MGDA. Increasing the formaldehyde level can drive the reaction to be more complete, i.e., converting more MGMA into the active MGDA in the final product. In doing so, additional glycolic acid can be formed in the final product, which surprisingly has little or no negative stability effect. Preferably, the molar fraction of glycolic acid / (MGDA + MGMA) is at least 0.010, more preferably at least 0.011 to 0.1, and even more preferably 0.011 to 0.045.

[0042] Preparative chromatography, such as preparative thin-layer chromatography, can also reduce the level of MGMA active substances in MGDA materials.

[0043] Maintaining a certain level of MGMA active material in MGDA materials reduces manufacturing complexity while having little or no negative impact on the color stability of detergents. Therefore, an advantageous MGDA / MGMA molar fraction is 3.6 to 100, preferably 3.7 to 50, more preferably 3.8 to 20, even more preferably 3.9 to 15, and even more preferably 4.0 to 10.

[0044] surfactants The liquid detergent of the present invention preferably contains 2 to 60% by weight, more preferably 3 to 50% by weight, and even more preferably 4 to 30% by weight of a surfactant. Preferably, more than 95% of the surfactant is selected from anionic and nonionic surfactants and mixtures thereof. The weight of anionic surfactants refers to their protonated form.

[0045] Generally, the nonionic and anionic surfactants used in surfactant systems can be selected from the surfactants described in Schwartz & Perry's "Surface Active Agents" Vol. 1, Interscience 1949; Schwartz, Perry & Berch's "McCutcheon's Emulsifiers and Detergents" Vol. 2, Interscience 1949, Manufacturing Confectioners Company's latest edition, or "Tenside-Taschenbuch," H. Stache, second edition, Carl Hauser Verlag, 1981. Preferably, the surfactant used is saturated.

[0046] Anionic surfactants are discussed in *Anionic Surfactants: Organic Chemistry*, edited by Helmut W. Stache (Marcel Dekker 1995), Surfactant Science Series, CRC Press. Preferred anionic surfactants are sulfonate and sulfate surfactants, preferably alkylbenzene sulfonates, alkyl sulfates, and alkyl ether sulfates. The preferred alkyl groups in alkyl sulfates and alkyl ether sulfates are selected from straight-chain or branched C12-C18 saturated alkyl chains and monounsaturated C18 chains.

[0047] In liquid compositions, C12-C14 alkyl ether sulfates having a straight-chain or branched alkyl group (C12-14) containing 12 to 14 carbon atoms and an average of 1 to 3 EO units per molecule are preferred. A preferred example is sodium lauryl ether sulfate (SLES), wherein the C12 lauryl alkyl group is ethoxylated with an average of 3 EO units per molecule.

[0048] LAS (linear alkylbenzene sulfonate) is a preferred anionic surfactant.

[0049] The key intermediate compounds in LAS manufacturing are the relevant chain olefins. These chain olefins (olefins) can be produced by any of the methods described above and can be formed from primary sugars, biomass, waste plastics, MSW, carbon capture, methane capture, marine carbon, etc. In contrast to the methods described above where olefins are processed by hydroformylation and oxidation to form straight-chain alcohols, olefins react with benzene and then sulfonate to form LAS. Straight-chain alkylbenzene sulfonates have an alkyl chain length of 10 to 18 carbon atoms. Commercial LAS are mixtures of closely related isomers and homologues of alkyl chains, each containing an aromatic ring sulfonated in the "para" position and attached to the straight-chain alkyl chain at any position except the terminal carbon. The straight-chain alkyl chain preferably has a chain length of 11 to 15 carbon atoms, with the main material having a chain length of about C12. Each alkyl chain homologue consists of a mixture of all possible sulfonylphenyl isomers except for the 1-phenyl isomer. LAS are typically formulated into compositions as acids (i.e., HLAS) and then at least partially neutralized in situ. Preferably, the linear alkylbenzene sulfonate surfactant is present in 1 to 20% by weight, more preferably 2 to 15% by weight, and most preferably 8 to 12% by weight.

[0050] Anionic surfactants are preferably added to detergent compositions in the form of salts. Preferred cations are alkali metal ions, such as sodium and potassium. However, the salt form of anionic surfactants can be formed in situ by neutralizing the acidic form of the surfactant with a base (such as sodium hydroxide) or an amine such as monoethanolamine, diethanolamine, or triethanolamine. Weight ratios are calculated for protonated surfactants. In both anionic and nonionic surfactants, the ethoxy unit can be partially replaced by the propoxy unit.

[0051] Further examples of suitable anionic surfactants are rhamnolipids, α-olefin sulfonates, olefin sulfonates, chain olefin sulfonates, alkane-2,3-dimethylbis(sulfates), hydroxyalkane sulfonates and disulfonates, fatty alcohol sulfates (FAS), paraffin sulfonates, ester sulfonates, sulfonated fatty acid glycerides, methyl ester sulfonates, alkyl succinic acid or alkenyl succinic acid, dodecenyl / tetradecenyl succinic acid (DTSA), fatty acid derivatives of amino acids, DATEMs, CITREMs, and diesters and monoesters of sulfosuccinic acid.

[0052] Preferably, the weight fraction of nonionic surfactant to total anionic surfactant is 0.1 to 9, more preferably 0.15 to 2, and most preferably 0.2 to 1. Total anionic surfactant refers to the total content of any type of anionic surfactant.

[0053] Nonionic surfactants are discussed in *Non-ionic Surfactants: Organic Chemistry*, edited by Nico M. van Os (Marcel Dekker 1998), Surfactant Science Series, CRC Press. Preferred nonionic surfactants are alkoxylated, preferably ethoxylated. Preferred nonionic surfactants are alcohol ethoxylated and methyl ester ethoxylated, having C10-C18 alkyl chains. Commonly used in laundry liquid compositions are C12-C18 saturated and monounsaturated alcohol ethoxylated compounds having a molar average of 5 to 12 EO units per molecule of straight-chain or branched alkyl groups. Preferred examples are selected from saturated straight-chain C12, C14, or C16 chains and branched or straight-chain saturated C15 alcohol ethoxylated compounds having a molar average of 7 to 9 ethoxylated units. Preferred methyl ester ethoxylated compounds comprise C16, C18, and C18:1, and a molar average of 8 to 12 ethoxide groups. More preferably, the methyl ester comprises 20 to 50% by weight of C16 MEE and 20 to 50% by weight of C18:1 MEE. C18:1 is preferably the oleic acid moiety, and C16 and C18 are saturated.

[0054] Typically, ethoxylation reactions that form alcohol ethoxylates are catalyzed using bases such as NaOH, KOH, or NaOCH3. This reaction produces an ethoxylation chain length distribution in the alcohol ethoxylate. Narrow-range ethoxylation provides a narrower ethoxylation chain length distribution than that achieved with NaOH, KOH, or NaOCH3. Narrow-range ethoxylation is achieved using narrow-range ethoxylation catalysts. Narrow-range ethoxylation catalysts are described in EP3289790 (Procter & Gamble), EP 1747183 (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-Ionic Surfactant Organic Chemistry (NM van Os ed), Surfactant Science Series Volume 72, CRC Press.

[0055] In anionic and nonionic surfactants, the ethoxy unit can be partially replaced by the propoxy unit.

[0056] Liquid detergents preferably contain 1 to 5% by weight of ethanol.

[0057] pH value Preferably, the aqueous liquid laundry detergent has a pH of 5 to 9, more preferably 6 to 8, as measured at 293 K.

[0058] fluorescent agents Liquid detergents preferably include fluorescent agents (also known as optical brighteners). Fluorescent agents are well known, and many such fluorescent agents are commercially available. Typically, these fluorescent agents are provided and used in the form of their alkali metal salts, such as sodium salts. The total amount of one or more fluorescent agents used in the detergent is typically 0.005 to 2% by weight, more preferably 0.01 to 0.1% by weight. Preferred types of fluorescent agents are stilbene biphenyl compounds, such as Tinopal (trademark) CBS-X; diamine stilbene disulfonic acid compounds, such as Tinopal DMS pure Xtra and Blankophor (trademark) HRH; and pyrazoline compounds, such as Blankophor SN. Preferred fluorescent agents are: sodium 2-(4-styryl-3-sulfophenyl)-2H-naphtho[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.

[0059] spices The liquid detergent of the present invention preferably contains one or more fragrances. The fragrance may be present in the range of 0.1 to 1% by weight. Examples of many suitable fragrances are provided in the CTFA (Cosmetic, Toiletry and Fragrance Association) 1992 International Buyers Guide (published by CFTA) and the OPD 1993 Chemicals Buyers Directory 80th Annual Edition (published by Schnell). In the fragrance mixture, preferably 15 to 25% by weight is a top note. The top note is defined in the Poucher (Journal of the Society of Cosmetic Chemists 6(2):80

[1955] ). Preferred top notes are selected from citrus oil, linalool, linalyl acetate, lavender, dihydromyrcenol, rose ether, and cis-3-hexanol.

[0060] Preferably, the fragrance comprises substituted benzaldehyde, wherein the substitution is preferably at the 3, 4, or 5 position, and more preferably the substituent is alkoxy. Preferably, the benzaldehyde is selected from 4-methoxybenzaldehyde, 5-methoxybenzaldehyde, 3-methoxybenzaldehyde, 4-ethoxybenzaldehyde, 5-ethoxybenzaldehyde, and 3-ethoxybenzaldehyde. Preferably, the benzaldehyde is present in 0.5 to 5% by weight of the fragrance.

[0061] The preferred fragrance components are selected from tricyclodecenyl acetate; tricyclodecenyl propionate; or tert-butylcyclohexyl acetate; tetrahydrolinalool; borneol acetate; borneol propionate; dihydromyrcenol; hexyl salicylate; tetramethylacetyl octahydronaphthalene; eucalyptol; 2-methylundecaldehyde; citronellol; geraniol; benzyl acetate; (E)-4-methyldec-3-en-5-ol.

[0062] Preferably, the fragrance contains at least six of these components, more preferably each in a content of at least 0.01 by weight in the detergent product.

[0063] Fragrances based on the tricyclic decenyl group are tricyclic decenyl acetate, tricyclic decenyl propionate, borneol acetate, and borneol propionate. The total weight of tricyclic decenyl acetate, tricyclic decenyl propionate, borneol acetate, and borneol propionate is called the tricyclic decenyl total. Preferred tert-butylcyclohexyl acetates are o-tert-butylcyclohexyl acetate or p-tert-butylcyclohexyl acetate.

[0064] Preferably, the fragrance contains at least four, more preferably at least five, components selected from tricyclodecenyl fragrance; tert-butylcyclohexyl acetate; dihydromyrcenol; tetramethylacetyl octahydronaphthalene; hexyl salicylate; and tetrahydrolinalool.

[0065] Preferably, for long-lasting fragrances, the weight ratio of total tricyclic decenyl groups: tert-butylcyclohexyl acetate: dihydromyrcenol is selected from 30 to 40: 20 to 30: 10 to 20, and for fresh fragrances, the weight ratio is selected from 5 to 15: 20 to 30: 35 to 50.

[0066] Preferably, the weight ratio of tetramethylacetyl octahydronaphthalene to hexyl salicylate is 5 to 15: 10 to 16.

[0067] Preferably, the weight fraction of dihydromyrcenol / hexyl salicylate is 0.5 to 6.0, more preferably 1.0 to 3.0.

[0068] Alkoxylated polyamine polymers Detergents advantageously contain alkoxylated polyamine polymers. Preferably, the polyamine is an alkoxylated cationic or zwitterionic diamine or polyamine polymer, wherein the positive charge is provided by quaternization of the nitrogen atom of the amine, and the anionic group (if present) is provided by sulfation or sulfonation of the alkoxylated group.

[0069] Preferably, the alkoxy compound is selected from propoxy and ethoxy, with ethoxy being the most preferred.

[0070] Preferably, 50 mol% or more of the nitrogen-containing amine is quaternized, more preferably with methyl quaternization. Preferably, the polymer contains 2 to 10, more preferably 2 to 6, and most preferably 3 to 5 quaternized nitrogen-containing amines. Preferably, the alkoxy group is selected from ethoxy and propoxy, most preferably ethoxy.

[0071] Preferably, the polymer contains ester (COO) or amide (CONH) groups in its structure. Preferably, these groups are arranged such that when all the ester or amide groups are hydrolyzed, at least one, preferably all, of the hydrolyzed fragments has a molecular weight of less than 4,000, more preferably less than 2,000, and most preferably less than 1,000.

[0072] Preferably, the polymer has the following form: Where R1 is a C3 to C8 alkyl group, and X is (C2H4O). n The Y group, wherein n is 15 to 30, wherein m is 2 to 10, preferably 2, 3, 4 or 5, and wherein Y is selected from OH and SO3. - And SO3 is preferred. - The number of radicals is greater than the number of OH radicals. It is preferable to have 0, 1, or 2 OH radicals. X and R1 may contain ester groups. X may contain a carbonyl group, preferably an ester group. Preferably, a C2H4O unit separates the ester group from N, thus the structural unit N-C2H4O-ester-(C2H4O) is preferred. n-1 Y.

[0073] Such polymers are described in WO2021239547 (Unilever). Exemplary polymers are sulfated ethoxylated hexamethylenediamine, and examples P1, P2, P3, P4, P5, and P6 of WO2021239547. The ester group can be incorporated by adding a lactone or sodium chloroacetate (modified Williamson synthesis) to an OH or NH group, followed by ethoxylation.

[0074] The polyamine polymer is preferably present in the composition at 0.1 to 3% by weight.

[0075] Decontamination polymer Stain-removing polymers (SRPs) help improve the removal of dirt from surfaces (such as fabrics or hard surfaces) during washing by modifying the surface during the washing process. SRPs used in this invention can include various charged (e.g., anionic) and uncharged monomer units, and the structure can be linear, branched, or star-shaped. The SRP structure can also include end-capping groups to control the molecular weight or modify polymer properties, such as surface activity. The weight-average molecular weight (Mb) of the SRP is... w The range can be suitably from about 1,000 to about 20,000, preferably from about 1,500 to about 10,000.

[0076] The SRP used in this invention may suitably be selected from copolyesters of dicarboxylic acids (e.g., adipic acid, phthalic acid, or terephthalic acid), glycols (e.g., ethylene glycol or propylene glycol), and polyglycols (e.g., polyethylene glycol or polypropylene glycol). The copolyester may also include monomer units substituted with anionic groups, such as, for example, sulfonated isophthaloyl units.

[0077] Other types of SRPs used in this invention include cellulose derivatives, such as hydroxy ether cellulose polymers, C1-C4 alkyl celluloses, and C4 hydroxyalkyl celluloses; polymers having hydrophobic segments of poly(vinyl ester), such as graft copolymers of poly(vinyl ester), for example, C1-C6 vinyl esters grafted onto a polyepoxide backbone (e.g., poly(vinyl caprolactam)); poly(vinyl caprolactam) and related copolymers with monomers such as vinylpyrrolidone and / or dimethylaminoethyl methacrylate; and polyester-polyamide polymers prepared by condensation of adipic acid, caprolactam, and polyethylene glycol.

[0078] The total SRP content in the detergent is preferably 0.1 to 10% by weight, more preferably 0.3 to 7% by weight, and even more preferably 0.5 to 5% by weight.

[0079] Suitable detergency polymers are described in more detail in U.S. Patents 5,574,179; 4,956,447; 4,861,512; 4,702,857, WO 2007 / 079850, and WO2016 / 005271.

[0080] polymer thickener Suitable polymer thickeners for use in this invention include hydrophobically modified alkali-swellable emulsion (HASE) copolymers. Exemplary HASE copolymers for use in this invention comprise linear or crosslinked copolymers prepared by addition polymerization of a monomer mixture comprising at least one acidic vinyl monomer, such as (meth)acrylic acid (i.e., methacrylic acid and / or acrylic acid); and at least one associating monomer. The term "associating monomer" in this invention refers to a monomer having an olefinically unsaturated segment (for addition polymerization with other monomers in the mixture) and a hydrophobic segment. Preferred types of associating monomers comprise a polyoxyethylene segment between the olefinically unsaturated segment and the hydrophobic segment. Preferred HASE copolymers for use in this invention comprise linear or crosslinked copolymers prepared by (meth)acrylic acid and (i) at least one C8-C monomer selected from linear or branched monomers. 40 Alkyl (preferably straight-chain C) 12 -C 22 The associating monomer is an alkyl polyethoxylated (meth)acrylate; and (ii) a further monomer selected from C1-C4 alkyl esters of (meth)acrylate, polyoxovinyl monomers (such as maleic acid, maleic anhydride, and / or salts thereof), and mixtures thereof, prepared by addition polymerization. The polyethoxylated portion of the associating monomer (i) typically contains about 5 to about 100, preferably about 10 to about 80, more preferably about 15 to about 60 oxyethylene repeating units. Mixtures of any of the above materials may also be used.

[0081] The liquid detergent preferably contains 0.01 to 5% by weight of a polymer thickener, more preferably 0.1 to 3% by weight.

[0082] enzymes The detergent compositions of the present invention may contain enzymes. Suitable enzymes include lipases, cellulases, peroxidases, proteases (protein hydrolases), amylases (starch-degrading enzymes), etc. Enzymes may be added in liquid or encapsulated form. In a preferred embodiment of the invention, the enzymes are present in encapsulated form. Suitable levels of each enzyme are 0.01 to 10 mg per gram of composition, more preferably 0.2 to 5 mg, and even more preferably 0.3 to 2 mg of active enzyme. A combination of at least one protease and at least one amylase is particularly advantageous.

[0083] Any enzymes present in the detergent can be stabilized with conventional stabilizers, such as polyols (e.g., propylene glycol or glycerol), sugars or sugar alcohols, lactic acid, boric acid or boric acid derivatives, such as aromatic borate esters, or phenyl boric acid derivatives, such as 4-formylphenylboronic acid, and the composition can be formulated as described, for example, in WO 92 / 19709 and WO 92 / 19708.

[0084] Other ingredients The liquid detergent preferably does not contain 0.001 to 2% by weight of tocopherol, and more preferably does not contain 0.001 to 2% by weight of an antioxidant as defined in claim 1(f) of US2005 / 0130859 A1. It has been found that such antioxidants are not necessarily required to be included in the liquid detergent of the present invention, while still reducing fading upon exposure to sunlight. Omitting these antioxidants from the detergent reduces the length of the ingredient list and simplifies manufacturing.

[0085] For the same reason, the liquid detergent of the present invention preferably does not contain pearlescent agents 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 unnecessary because their inclusion complicates manufacturing. This further reduces the length of the ingredient list and simplifies manufacturing.

[0086] Although not preferred, such tocopherols and pearlescent agents can be present in the aqueous liquid laundry detergent according to the invention.

[0087] Transparent plastic container form The transparent plastic container of the present invention has a preferred internal volume of 0.2 to 5 liters, more preferably 0.5 to 2.2 liters. The detergent product is a multi-dose liquid contained in a non-water-soluble plastic container.

[0088] Advantageously, the container has a pouring neck with a resealable screw cap, wherein the maximum dimension of the pouring neck is at least three times smaller than the maximum dimension of the container. Preferably, the minimum width of the container base is 3 cm, more preferably 4 cm. The width is measured parallel to a flat surface on which the container is placed upright.

[0089] When sold for the first time, the container should be filled to more than 95% of its capacity by weight. Surprisingly, this further reduces the fading activity when exposed to sunlight.

[0090] The plastic of the container can be colored, although it should remain at least partially transparent. This can be easily achieved by reducing the amount of colorant in the plastic as needed and / or by changing the container wall thickness. Advantageously, the plastic of the container contains virtually no added colorant and has no perceptible color to the untrained human eye.

[0091] Advantageously, the container's plastic comprises at least 30% by weight, preferably at least 50% by weight, and even more preferably at least 80% by weight, of PET plastic based on the total weight of the container's plastic.

[0092] Advantageously, the plastic of the container contains at least 20% by weight, preferably at least 30% by weight, more preferably at least 50% by weight and even more preferably at least 80% by weight of recycled PET plastic based on the total weight of the container plastic.

[0093] The weight percentage of recycled plastic can be determined by measuring the tensile strength of the plastic. Alternatively, recycled plastic can be distinguished from virgin plastic in various ways because recycled plastic typically contains polymers with reduced molecular weights and is characterized by the presence of impurities (see Rahimi et al., “Chemical recycling of waste plastics for newmaterials production”, vol. 1, Art. No. 0046, 2017).

[0094] Containers containing recycled plastic are believed to be more sensitive to fading from the liquid detergent contained therein than containers containing only virgin plastic. Therefore, containers containing recycled plastic particularly benefit from the liquid detergent according to the present invention.

[0095] Advantageously, the plastic of the container contains 0.01 to 6% by weight, more preferably 0.1 to 5% by weight, and even more preferably 1 to 4.5% by weight of a UV absorber based on the total weight of the container plastic. The UV absorber is present in the plastic as an additive. Advantageous UV absorbers are cyanoacrylate UV absorbers. These are particularly preferably at a level of 0.03 to 0.3% by weight, more preferably 0.05 to 0.2% by weight, based on the total weight of the container plastic. Preferred cyanoacrylate UV absorbers include / are diphenyl acrylates, more preferably alkyl-2-cyano-3,3-diphenyl acrylates, wherein the alkyl group is a branched or straight-chain saturated alkyl group with a molecular weight of less than 120, even more preferably pentaerythritol tetra(2-cyano-3,3-diphenyl acrylate), 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, ethyl 2-cyano-3,3-diphenyl-2-acrylate, 2-ethylhexyl-2-cyano-3,3-diphenyl acrylate, or mixtures thereof. Cyanoacrylate UV absorbers can be obtained from BASF (Uvinul), Deltachem (QingDao) (Ominstab), MPI Chemie (UV), and Shipro Kasei Kaisha (Seesorb).

[0096] It is believed that cyanoacrylate UV absorbers are particularly beneficial for PET plastics, especially recycled PET plastics.

[0097] The transparent plastic container used in this invention is most advantageously a bottle shape.

[0098] method The detergent product of the present invention is preferably prepared in a method comprising the following steps: a) Provide a transparent plastic container according to the invention; and b) Provides an aqueous liquid laundry detergent composition according to the invention; and c) Fill the container provided in step a) with the aqueous liquid laundry detergent composition provided in step b) to provide the detergent product.

[0099] It should be understood that steps a) and b) can be performed in any order.

[0100] The amount of recycled plastic contained in the transparent plastic container provided in step a) can be determined by measuring the weight percentage of the total plastic raw materials used to manufacture the container plastic. Plastic containers containing recycled plastic (or substantially made from it) are commercially available, and their manufacturing methods are known in the art. References include… Methods of Recycling, Properties and Applications of Recycled Thermoplastic Polymers Information on recycled plastics and their use in the manufacture of detergent bottles is discussed in ME Grigore, Recycling 2017, 2, 24. Typically, to transform recycled post-use plastics into raw materials that can be used to manufacture new plastic products, the plastics are washed, dried, and appropriately granulated. The granulated recycled plastics can then optionally be mixed with virgin granulated plastics and processed to shape them into new plastic products.

[0101] Methods for converting (granulated) plastic raw materials into final molded plastic products (e.g., detergent bottles) are known in the art. A general description of these methods can be found, for example, in Hans-Georg Elias, “An introduction to plastics,” 1993. These techniques include thermoforming, blow molding, injection molding, or injection stretch blow molding. When the plastic raw material is melted, a UV absorber (if present) is preferably added to the (granulated) plastic raw material and mixed with it prior to container formation.

[0102] Providing the aqueous liquid laundry detergent in step b) can also be accomplished using conventional methods known in the art. This method may include the step of mixing all the components of the composition to provide the aqueous liquid laundry detergent. Surprisingly, it has been found that the aqueous liquid laundry detergent can be manufactured using water containing 0.1-10 ppm of transition metal ions without negatively impacting the color stability of the aqueous laundry detergent. Preferred transition metals are iron and copper. Allowing such concentrations in the final detergent of the present invention is indeed advantageous because it reduces the complexity of water quality monitoring and / or water purification systems, simplifying the process.

[0103] It should be understood that the improved storage stability of the detergent products of the present invention allows for logistical flexibility. It allows for a combination of energy-efficient, centralized large-scale production with long-distance, large-scale international distribution, which would otherwise require centralized accumulation (and extended storage times). For example, cargo ships may take 10 to 20 days to cross the Atlantic, not including time spent loading and unloading at ports. Therefore, preferably, the method of manufacturing the products of the present invention provides 10,000 to 300,000 tons per year, more preferably 15,000 to 250,000 tons per year, even more preferably 20,000 to 200,000 tons per year, and even more preferably 30,000 to 150,000 tons per year on a large scale.

[0104] Preferably, the product of the present invention can be obtained by the method of the present invention.

[0105] Unless otherwise stated, the preferred aspect of one aspect of the invention (e.g., a transparent plastic container containing an aqueous liquid laundry detergent composition) may also be necessaryly modified to serve as a preferred aspect in one of other aspects (e.g., a method of manufacturing a transparent plastic container containing an aqueous liquid laundry detergent composition; e.g., a liquid laundry detergent in which MGDA is used to reduce fading).

[0106] The invention will now be illustrated by the following non-limiting embodiments.

[0107] Example Liquid laundry detergent formulations were prepared as shown in Table 1 below. Example 1 is a detergent formulation according to the present invention. Comparative formulations A and B are detergent formulations not according to the present invention.

[0108] Table 1: Detergent Formulations. Amounts are expressed as a percentage by weight unless otherwise stated.

[0109] 1 C12-14 alcohol ethoxylates with an average degree of ethoxylation of 7 moles (7EO) 2 An ethoxylated anthraquinone dye with this structure was added to the formulation to give an absorbance of 0.65 (1 cm) at the dye's maximum absorption (646 nm). The dye has the following structure: To reproducibly simulate the transition metals found in the plant water, CuSO4 and FeSO4 were added to obtain 0.8 ppm Cu(II) and 0.7 ppm Fe(II).

[0110] The UV-VIS spectrum of the formulation was measured in a 1 cm cell (cuvette). The formulation was irradiated for 48 hours in a 20 mL glass vial using an aging apparatus simulating Florida outdoor sunlight. The light intensity was set to 394 W / m². 2 (300-800 nm). After irradiation, the UV-VIS spectrum of the formulation was measured in a UV-VIS spectrophotometer and compared with the irradiated control without the addition of chelating agent.

[0111] The remaining percentage of dye is calculated as follows: Remaining % dye = 100 (A) 之后 / A 之前 ) Where A 之后 A is the absorbance of the dye at 646 nm after irradiation. 之前 This represents the absorbance of the dye at 646 nm before irradiation. The results are given in Table 2 below.

[0112] Table 2: Results of discoloration of liquid detergent in the bottle

[0113] The above experiment simulated the exposure of detergent products to sunlight. The results showed that when using MGDA, the water-based liquid laundry detergent according to the present invention resulted in less fading of the detergent.

Claims

1. A transparent plastic container comprising an aqueous liquid laundry detergent composition, wherein the liquid detergent composition comprises: • 5 to 60% by weight of surfactant; and • 0.05 to 8% by weight of methylglycine diacetic acid (MGDA); and • 0.00005 to 0.02% by weight of a dye containing an anthraquinone chromophore, wherein the chromophore contains an amino or amide group at the 1-position of the anthraquinone ring; and The container described herein has an internal volume of 0.1 to 10 liters; and The plastic of the container contains 20 to 100% by weight of polyethylene terephthalate (PET) based on the total weight of the container plastic.

2. The transparent plastic container comprising an aqueous liquid laundry detergent composition according to claim 1, wherein the dye provides the aqueous liquid detergent composition with purple, blue, or green, alone or in combination, preferably one or more of the dyes being purple, blue, or green dyes.

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

4. A transparent plastic container comprising an aqueous liquid laundry detergent composition according to any one of the preceding claims, wherein the dye comprises 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 Blue 34, 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, and Disperse Blue 109. 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 One or more of 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 any one of the preceding claims, wherein the amount of MGDA active substance is 0.06 to 5% by weight, preferably 0.08 to 4.5% by weight, more preferably 0.1 to 4.0% by weight, even more preferably 0.5 to 3.5% by weight, even more preferably 0.8 to 3.0% by weight, and even more preferably 1.0 to 3.0% by weight.

6. A transparent plastic container comprising an aqueous liquid laundry detergent composition according to any one of the preceding claims, wherein the MGDA / MGMA molar fraction of the MGDA material is 3.6 to 100, preferably 3.7 to 50, more preferably 3.8 to 20, even more preferably 3.9 to 15, and even more preferably 4.0 to 10, wherein MGMA refers to methylglycine monoacetic acid.

7. A transparent plastic container comprising an aqueous liquid laundry detergent composition according to any one of the preceding claims, wherein the surfactant is composed of anionic surfactants, nonionic surfactants, or mixtures thereof, preferably a mixture of anionic and nonionic surfactants.

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

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

10. The transparent plastic container comprising an aqueous liquid laundry detergent composition according to claim 9, wherein the UV absorber comprises 0.03 to 0.3% by weight, preferably 0.05 to 0.2% by weight, of a cyanoacrylate UV absorber based on the weight of the container plastic, wherein the cyanoacrylate UV absorber comprises, preferably, diphenylacrylate, more preferably alkyl-2-cyano-3,3-diphenylacrylate, wherein the alkyl group is a branched or straight-chain saturated alkyl group with a molecular weight of less than 120. Even more preferably, pentaerythritol tetra(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-diphenylacrylate, ethyl 2-cyano-3,3-diphenyl-2-acrylate, 2-ethylhexyl-2-cyano-3,3-diphenylacrylate, or mixtures thereof.

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

12. A transparent plastic container comprising an aqueous liquid laundry detergent composition according to any one 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 method for manufacturing a detergent product according to any one of the preceding claims, wherein the method comprises the following steps: a) providing a transparent plastic container according to any one of the preceding claims; and b) Provides an aqueous liquid laundry detergent composition according to any one of the preceding claims; and c) Fill the container provided in step a) with the aqueous liquid laundry detergent composition provided in step b) to provide the detergent product; and The method described therein is a large-scale production process that produces 100,000 to 300,000 tons per year.

14. A transparent plastic container comprising an aqueous liquid laundry detergent composition according to any one of the preceding claims, obtainable by the method according to claim 13.

15. MGDA is used in liquid laundry detergent compositions to reduce fading when stored in clear plastic containers.

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