Cleaning composition with pearlescent

Abstract

The invention discloses a pearlescent cleaning composition and application thereof. The pearlescent cleaning composition comprises (a) salt of N-long-chain acyl amino acid, (b) free N-long-chain acyl amino acid, (c) a hydrophilic nonionic surfactant, (d) an ampholytic surfactant and (e) a specific type of sulfonate surfactant, the related cleaning composition with pearlescent luster can be used for preparing personal care products, household cleaning products and industrial cleaning products.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cleaning and care technology, in particular to a cleaning composition with pearl luster and its application in personal care products, household cleaning products and industrial cleaning products. BACKGROUND

[0002] In the development of cosmetics, "pearl luster" is not only a visual decoration, but also a key factor affecting the quality and positioning of the product. There are two common mechanisms for the generation of "pearl luster": one is the lipid type pearl luster agent (the typical representative is ethylene glycol stearate (EGS), fatty alcohol ether, etc.), which relies on the reflection of lamellar crystals to create a soft and milky pearl effect; the other is mica / TiO2 pearl powder, which brings a metallic shine and rainbow color through thin film interference.

[0003] In addition, in a specific formulation system, some surfactants can produce a pearl luster effect. For example, alkyl glucoside with a specific carbon chain can impart a deep pearl luster appearance in a specific system. Coconut amide MEA / DEA, etc. are also used for pearl luster enhancement. Succinates can produce a pearl luster cream based on a higher Krafft point. However, this type of surfactant can only produce a significant effect in a strict formulation system, and selecting the appropriate formulation system is challenging.

[0004] Common pearl luster type cleaning products on the market (such as facial cleanser) generally produce an opaque pearl luster appearance by adding pearl luster agent components such as ethylene glycol mono (di) stearate. However, the addition of pearl luster agents often brings some irritation to the system.

[0005] Although anionic surfactants such as alkyl sulfates and polyoxyethylene alkyl sulfates have been widely used as surfactants for hair / body cleaning bases. However, with the increase in shampooing / bathing frequency in recent years, they can sometimes feel dry and irritating, so there is a need for less irritating cleaning agents. In addition, these are petroleum-derived surfactants, which are contrary to the current orientation of sustainable development and environmental protection.

[0006] The cosmetics and personal care industry has proven the increasing popularity and importance of "sulfate-free" "dioxane-free" personal care cleaning products containing environmentally friendly, sustainable and mild surfactants. Amino acid-based surfactants are considered to be more "green", more mild and more sustainable than traditional petroleum-based surfactants.

[0007] The combination of an amino acid cleaning system with "pearl luster" will face a very big thickening difficulty. The pearl luster cleaning products on the market mainly use acrylic polymers and their derivatives to thicken and stabilize the formulation, which not only increases the cost of the formulation, but also has a certain impact on the foam of the formulation.

[0008] CN102920616 discloses a pearl type foam facial cleanser, which uses sodium cocoyl isethionate as an anionic surfactant as the main surfactant and stearic acid in a specific ratio to present a pearl effect. However, hydroxyethyl cellulose needs to be added as a thickening agent, and an acrylate copolymer is needed to thicken the system.

[0009] CN112137905B discloses a mild pearl type facial cleanser, which is composed of disodium fatty alcohol sulfosuccinate 20%-40%, lanolin 4%-6%, surfactant 15-30%, polyol 10-15%, etc. The patent uses disodium fatty alcohol sulfosuccinate and lanolin in a specific ratio to form a self-thickening effect with a pearl effect.

[0010] JP3119966B2 forms a facial cleanser composition with stable pearl luster, low irritation and excellent foaming capacity by synergistically compounding C14-C18 fatty acid with ethylene glycol difatty acid ester (3-20%), anionic surfactant (9-30%) and polyoxyethylene alkyl ether acetate (1-10%) in a specific ratio.

[0011] For amino acid surfactant cleansing systems, in order to reduce irritation and the influence of pearl agents on foam, there is an urgent need to research cleaning products with "pearl" effect by self-thickening. SUMMARY

[0012] The inventors' team found that for an amino acid surfactant cleansing system containing N-long chain acyl amino acid salt, in the presence of free N-long chain acyl amino acid, the synergistic effect of (c) hydrophilic nonionic surfactant and (d) amphoteric surfactant can significantly improve the viscosity of the formula. In this system, by introducing component (e) a specific type of sulfonate surfactant, a self-thickening cleaning product with pearl is obtained.

[0013] Specifically, the present application provides the following technical solutions.

[0014] The present application provides a cleaning composition with pearl, which comprises (a) a salt of N-long chain acyl amino acid, (b) free N-long chain acyl amino acid, (c) a hydrophilic nonionic surfactant, and (d) an amphoteric surfactant.

[0015] Alternatively, the cleaning composition with pearl comprises (a') N-long chain acyl amino acid partially neutralized with a base, (c) a hydrophilic nonionic surfactant, and (d) an amphoteric surfactant. Wherein, (a') N-long chain acyl amino acid partially neutralized with a base refers to the product after N-long chain acyl amino acid is partially neutralized with a base. In the composition, the final existence is a salt of N-long chain acyl amino acid and free N-long chain acyl amino acid which is not neutralized.

[0016] Alternatively, the pearlescent cleansing composition comprises (a") a base and an N-long chain acyl amino acid, and the number of moles of the base is less than the number of moles of the N-long chain acyl amino acid, such that the degree of neutralization of the N-long chain acyl amino acid is less than 100%, (c) a hydrophilic nonionic surfactant, (d) an amphoteric surfactant. The base and the N-long chain acyl amino acid are added to the formulation separately, but they will react inevitably, and because the degree of neutralization is less than 100%, the final presence in the composition is the salt of the N-long chain acyl amino acid and the free N-long chain acyl amino acid that is not neutralized.

[0017] Further, component (e) is introduced, which is particularly selected from sodium lauroyl methyl isethionate (or called "sodium lauroyl methyl isethionate") or sodium lauryl isethionate. When the amount of component (a), (a'), (a") is insufficient or inorganic base, organic amine is used to neutralize the N-long chain acyl amino acid, component (e) can not only ensure the viscosity and / or low temperature stability and / or transparency of the system to meet the stringent requirements of the formulation, but also form a pearlescent product with each component.

[0018] For the N-long chain acyl amino acid in the composition, the N-long chain acyl group in the N-long chain acyl amino acid is derived from a saturated or unsaturated linear or branched fatty acid with 8-22 carbon atoms. Further, the N-long chain acyl group in the N-long chain acyl amino acid is selected from one or more of octanoyl, decanoyl, undecanoyl, lauroyl, myristoyl, pentadecanoyl, palmitoyl, stearoyl, oleoyl, linoleoyl, isostearoyl, coconut oil fatty acyl, palm oil fatty acyl, preferably coconut oil fatty acyl or lauroyl, most preferably lauroyl.

[0019] The amino acid in the N-long chain acyl amino acid is derived from one or more of glycine, alanine, glutamic acid, sarcosine, aspartic acid, leucine, isoleucine, valine, threonine, proline, phenylalanine, arginine, lysine, (methyl)taurine. Further, the amino acid in the N-long chain acyl amino acid is derived from one or more of alanine, glycine, glutamic acid, sarcosine, arginine, lysine, (methyl)taurine, preferably alanine, most preferably L-alanine. The N-long chain acyl (methyl)taurine in the present application refers to N-long chain acyl methyl taurine or N-long chain acyl taurine.

[0020] As an example, the N-long chain acyl amino acid can be selected from cocoyl alanine, lauroyl alanine, cocoyl sarcosine, lauroyl sarcosine, lauroyl glutamic acid, cocoyl glutamic acid, oleoyl glutamic acid, cocoyl glycine, lauroyl glycine, stearoyl glutamic acid, etc.

[0021] The present application discovers that N-long chain acyl amino acids with different structures exhibit different thickening abilities. Free N-long chain acyl glutamic acid has weaker thickening effect than corresponding N-long chain acyl alanine, glycine, sarcosine. N-long chain acyl glycine has good thickening ability, but the formulation is easy to precipitate, and has poor stability, and is suitable for paste products with low transparency requirement. The present application surprisingly discovers that under the same formulation conditions, the thickening ability of lauryl alanine is far superior to other long chain acyl amino acids, and is 5-10 times that of lauryl sarcosine, cocoyl alanine (cocoyl amino propionic acid) and the like. This super strong and far exceeding expected thickening ability can completely solve the problem of difficult thickening of amino acid surface active system, and can completely replace the traditional AES system.

[0022] (a) The salt of N-long chain acyl amino acid refers to the salt formed by N-long chain acyl amino acid and a base. The base is selected from one or more of inorganic base, organic amine, basic amino acid. The inorganic base is selected from one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, preferably sodium hydroxide or potassium hydroxide. The organic amine is selected from amine, alkanolamine and the like. For the basic amino acid, it is selected from one or more of arginine, lysine, citrulline, ornithine, creatine, histidine, diaminobutyric acid, diaminopropionic acid, preferably arginine and / or lysine, most preferably L-arginine. The base in (a') and (a'') also has the same definition.

[0023] The N-long chain acyl amino acid can be directly mixed into commercially available long chain acyl amino acid salt such as YB02-30 (sodium cocoyl amino propionate) of Puji, AS02-30 (sodium lauryl sarcosinate), AMIN LS30 (sodium lauryl sarcosinate) of Tianci, LA-Arg 30 (sodium lauryl alanine arginine salt) and LA-Na 30 (sodium lauryl alanine) of Suzhou Weimei, or directly mixed into a formulation containing (a) N-long chain acyl amino acid salt to obtain (a) salt of N-long chain acyl amino acid and (b) free N-long chain acyl amino acid.

[0024] The N-long chain acyl amino acid can also be partially neutralized with a base to obtain (a') N-long chain acyl amino acid partially neutralized with a base. Alternatively, a base and N-long chain acyl amino acid are added separately into a formulation (corresponding to (a'')). Since the base is partially neutralized and the N-long chain acyl amino acid is in excess, the neutralized N-long chain acyl amino acid salt and the unneutralized free N-long chain acyl amino acid will coexist in the system, which is essentially equivalent to (a) salt of N-long chain acyl amino acid + (b) free N-long chain acyl amino acid.

[0025] Increasing the amount of N-long chain acyl amino acid salt and free N-long chain acyl amino acid is beneficial to increase the viscosity of the composition. However, too much amount will make the formula too viscous; too little amount will make the formula insufficiently viscous.

[0026] From the perspective of cost control, the weight percentage of component (a), (a') or (a") in the cleaning composition with pearlescent is below 10 wt%, preferably below 8 wt%, and the formulator can choose whether to introduce component (e) according to the specific viscosity requirement of the actual product. Especially for products with high viscosity requirement, it is recommended to introduce component (e).

[0027] From the perspective of cost control, (a) N-long chain acyl amino acid salt is an inorganic base salt, an organic amine salt of N-long chain acyl amino acid, for example, one or more of sodium salt, potassium salt, ammonium salt, TEA salt. The base in (a'), (a") is one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, amine, alkanolamine.

[0028] The solubilizing property of inorganic base salt, organic amine salt of N-long chain acyl amino acid to free N-long chain acyl amino acid is lower than that of basic amino acid salt of N-long chain acyl amino acid, in which case, it is preferred to reduce the amount of free N-long chain acyl amino acid in the formula system. Further, for (a'), (a"), the degree of neutralization is controlled to be above 80% and below 95%, preferably above 85%. For example, the degree of neutralization is 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%. Too low degree of neutralization will result in too much free N-long chain acyl amino acid, and the formula is prone to precipitation. Too high degree of neutralization will result in insufficient free N-long chain acyl amino acid, and the thickening effect is limited. The aforementioned degree of neutralization refers to the percentage of N-long chain acyl amino acid that is neutralized. For example, 80% neutralization means that 80% of the total N-long chain acyl amino acid is neutralized by the base to form a salt, and the remaining 20% is free N-long chain acyl amino acid. Correspondingly, for component (a), the molar ratio of (a) / (b) to component (b) is 4-19.

[0029] The synthesis process of N-long chain acyl amino acid surfactant can refer to the general synthesis method of N-acyl amino acid surfactant, which is divided into direct method and indirect method. The direct synthesis method of fatty acid raw material includes enzyme catalysis synthesis and dehydration condensation. The indirect synthesis method includes fatty acyl chloride acylation, fatty nitrile hydrolysis acylation, fatty acid anhydride acylation, amide carbonylation reaction, etc. The more preferred method is to prepare it by the reaction of fatty acyl chloride and amino group of amino acid (Shotten-Baumann condensation reaction or Shotten-Baumann reaction).

[0030] A typical preparation process suitable for the present application is as follows: amino acid and sodium hydroxide are dissolved in water or a mixed solution of water and acetone to obtain an amino acid salt solution; then lauroyl chloride and sodium hydroxide solution are slowly added to the amino acid salt solution, the pH of the reaction system is controlled, after the addition is completed, the product is post-treated. Representative methods are disclosed in CN1798821A, US6703517B2, CN102875409B, JPH0570418A, etc.

[0031] For the post-treatment of N-long-chain acyl amino acid products, conventional recrystallization, water washing, drying, etc. can be used. Preferably, the post-treatment comprises the following steps: mixing N-long-chain acyl amino acid crude product with a solvent, optionally stirring, controlling the temperature T of the mixed system above the melting point of long-chain fatty acid and below the melting point of N-long-chain acyl amino acid, the solvent being water or an organic solvent or a mixed solution of water and an organic solvent; after controlling the temperature of the system, solid-liquid separation operation is performed. Related methods are disclosed by the present inventors in CN202210867760.7, PCT / CN2022 / 107270, and the relevant contents are hereby incorporated by reference.

[0032] For component (c) hydrophilic nonionic surfactant, it refers to a type of nonionic surfactant with hydrophilicity, which can be dispersed or dissolved in water to form an emulsion or a translucent to transparent solution.

[0033] The present application mainly prefers O / W emulsifiers, or solubilizing nonionic surfactants, or nonionic surfactants with HLB above 6.

[0034] The O / W emulsifier refers to a type of substance that can uniformly disperse the oil phase (Oil, abbreviated as O) in the form of microdroplets in the water phase (Water, abbreviated as W) to form an oil-in-water (Oil-in-Water, O / W) emulsion. In the present application, the O / W emulsifier can stabilize free N-long-chain acyl amino acid, ensure that it does not precipitate, and can play a synergistic role in thickening.

[0035] The solubilizing nonionic surfactant refers to a nonionic surfactant with solubilizing effect, which can dissolve lipophilic raw materials in water. In the present application, it particularly refers to the ability to dissolve lipophilic free N-long-chain acyl amino acid in water, ensure that it does not precipitate, and can play a synergistic role in thickening.

[0036] For nonionic surfactants with HLB above 6, the relative strength of the hydrophilic group and the lipophilic group reflects their partitioning ability in water and oil. HLB above 6 maximizes the stability of free N-long chain acyl amino acid. The present application particularly prefers nonionic surfactants with HLB above 8, more preferably 10, 12, or even 14. If HLB is too low (e.g. 2, 3, 4), the hydrophilicity is too weak to be beneficial for thickening and for maintaining the formulation transparent and stable at low temperature. If HLB is too high (e.g. 14 or above), it will be very beneficial for thickening and for maintaining the formulation stable at low temperature. Suitable HLB values are, for example, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35. The present application has found that if HLB is above 12, e.g. 12, 14, 16, 18, it will be very beneficial for making a completely transparent product. Exemplary examples with HLB above 12 include PEG-120 methyl glucose dioleate, PEG 150 pentaerythrityl tetra-stearate, polyglyceryl-10 laurate, PEG-160 sorbitan triisostearate, etc.

[0037] In addition to the relative strength of the hydrophilic group and the lipophilic group, the present application has surprisingly found that the hydrophilicity of the hydrophilic group itself has a significant impact on thickening. If one wants to further improve the thickening effect, one needs to focus on the hydrophilicity of the hydrophilic group in addition to HLB.

[0038] To characterize the hydrophilicity contribution of the hydrophilic group (defined as “hydrophilicity value” in the present application), the present application has borrowed the Davies method in the HLB calculation method. According to the Davies method, each chemical group (e.g. -OH, -COO-, -CH3, etc.) is assigned a numerical value reflecting its hydrophilicity or lipophilicity. In the present application, the “hydrophilicity value” is equal to the sum of the numerical values assigned to all the hydrophilic chemical groups in the surfactant based on the Davies method.

[0039] For example, for hydrophilic groups, -OH (hydroxyl) is +1.9, -O- (ether bond) is +1.3, -COO- (ester group) is +2.4, -COOH (carboxyl) is +2.1, -SO3- (sulfonic acid group) is +11.0, -(CH2-CH2-O)- (polyoxyethylene unit EO) is +0.33, -O-CH2CH(OH)CH2- (polyglycerol unit) is 1.77, and more values can be referred to the values disclosed in the Davies method. The sorbitan ring as a whole is -1.5, which is already negative, and therefore it is not considered as a hydrophilic group in the present application.(c) The hydrophilicity value of the hydrophilic nonionic surfactant is too low, which limits the thickening effect and cannot obtain a product with ultra-high viscosity; increasing the hydrophilicity value is beneficial to improve the thickening performance.

[0040] For example, for Tween 20, according to the Davies method, the hydrophilicity value = 5.7 (3 -OH) + 2.4 (1 ester group) + 6.6 (20 EO) = 14.7, although the overall HLB value of Tween 20 is high, but due to its hydrophilicity value is only 14.7, which leads to limited thickening effect. For PEG-20 glyceryl triisostearate, the corresponding hydrophilicity value = 7.2 (3 ester groups) + 6.6 (20 EO) = 13.8; for PEG-40 sorbitan stearate, the corresponding hydrophilicity value = 5.7 (3 -OH) + 2.4 (1 ester group) + 13.2 (40 EO) = 21.3; for PEG-60 glyceryl isostearate, the corresponding hydrophilicity value = 3.8 (2 -OH) + 2.4 (1 ester group) + 19.8 (60 EO) = 26; for polyglyceryl-6 monooleate, the corresponding hydrophilicity value = 10.62 (6 polyglycerol units -O-CH2CH(OH)CH2-) + 1.9 (1 -OH) + 2.4 (ester group) = 14.92; for polyglyceryl-8 monooleate, the corresponding hydrophilicity value = 14.16 (8 polyglycerol units) + 1.9 (1 -OH) + 2.4 (ester group) = 18.46; for polyglyceryl-10 laurate, the corresponding hydrophilicity value = 17.7 (10 polyglycerol units) + 1.9 (1 -OH) + 2.4 (ester group) = 22. The hydrophilicity value of PEG-20 glyceryl triisostearate and polyglyceryl-6 monooleate is relatively low, which leads to limited thickening effect. With the increase of the hydrophilicity value, it is beneficial to enhance the thickening ability of the nonionic surfactant under the same conditions. The present application preferably the hydrophilicity value of the hydrophilic nonionic surfactant is above 15 (calculated based on the Davies method), further preferably above 20, 25 or even 30.

[0041] Further, the (c) hydrophilic nonionic surfactant can be polyoxyethylene type, polyol type, alkyl amide type, etc. The present application preferably the hydrophilic group of the hydrophilic nonionic surfactant comprises polyoxyethylene units or comprises polyglycerol units.

[0042] The polyoxyethylene unit can be understood as an EO chain, a PEG unit or an oxyethylene unit. The more the number of polyoxyethylene units, the better the hydrophilicity, and the more conducive to thickening and low temperature stability. It is more advantageous for the number of PEG units to be above 50, preferably 60, 80, 100 or more, such as 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160. For example, PEG-120 methyl glucose dioleate, PEG-150 pentaerythritol tetra stearate, PEG-160 sorbitan triisostearate, PEG-100 stearate, PEG-60 glyceryl isostearate and other substances with high PEG unit number all have very good thickening and low temperature stability.

[0043] The polyglyceryl unit refers to a polyglyceryl group obtained by polymerization of glycerol. The more the number of polyglyceryl units, the better the hydrophilicity, and the more conducive to thickening and low temperature stability. It is more advantageous for the number of polyglyceryl units to be above 6, preferably 8, 10 or more, such as 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20. For example, polyglyceryl-10 laurate and other substances with high polyglyceryl unit number all have very good thickening and low temperature stability.

[0044] Further, the present application finds that the number of carbon atoms in the hydrophobic group of the hydrophilic nonionic surfactant has an impact on the thickening performance. If the number of carbon atoms is greater than 10 (such as coconut, lauryl, stearyl), it is conducive to thickening. If the number of carbon atoms is below 10 (such as octyl, decyl), it is not conducive to thickening. In addition, if the hydrophobic group is branched, it is conducive to thickening. For example, polyglyceryl-10 mono isostearate is better than polyglyceryl-10 monostearate. It may be because the branched structure is conducive to improving the three-dimensional structure of the surfactant.

[0045] In addition to the above hydrophilicity, HLB value, the spatial configuration of (c) hydrophilic nonionic surfactant is also very important. For example, for nonionic surfactants with low HLB value, if they have a three-dimensional spatial structure, they can still have good thickening performance. Typically, if the chemical structure of (c) hydrophilic nonionic surfactant has 2 or more hydrophobic groups, especially 3 or more hydrophobic groups, it will not be a linear structure, but a three-dimensional spatial structure, which is speculated to effectively promote the formation of micellar aggregates.

[0046] In addition, nonionic surfactants derived from polyhydroxy compounds such as pentaerythritol, glucose / methyl glucose, sorbitan, sorbitol, glycerin, etc. are generally obtained by esterification of polyhydroxy compounds, hydrophilic compounds (e.g., ethylene oxide, polyglycerin), fatty acids, and have hydroxyl groups linked to two or more (preferably three or more) hydrophobic groups, thereby having the three-dimensional spatial structure.

[0047] For example, polyglyceryl-3 methyl glucose distearate has less hydrophilicity than polyglyceryl-10 laurate, but has stronger thickening ability due to the three-dimensional spatial structure. For another example, PEG-150 pentaerythritol tetra-stearate, which is derived from pentaerythritol, has a very good three-dimensional spatial structure and exhibits very strong thickening ability.

[0048] The amount of (c) hydrophilic nonionic surfactant is related to the amount of free N-long chain acyl amino acid and the amount of amphoteric surfactant. If the amount of free N-long chain acyl amino acid or amphoteric surfactant is high, the amount of (c) hydrophilic nonionic surfactant can be appropriately reduced. Conversely, if the amount of free N-long chain acyl amino acid or amphoteric surfactant is low, the amount of (c) hydrophilic nonionic surfactant can be appropriately increased. Generally, the weight percentage content (both refer to the percentage after folding) of (c) hydrophilic nonionic surfactant in the cleansing composition with pearl shine is 0.05-5 wt%, preferably 0.1-4 wt%, and further preferably 0.5-3 wt%. For example, it can be 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, 0.7 wt%, 1 wt%, 2 wt%, 3 wt%, 4 wt%, 5 wt%. If the amount of (c) hydrophilic nonionic surfactant is too high, although it is beneficial for thickening, it will affect the washing / feel of the product to some extent.

[0049] For component (d) amphoteric surfactant, it refers to a surfactant having both anionic groups (such as carboxylate, sulfonate, phosphate) and cationic groups (such as ammonium group, quaternary ammonium group) in the molecular structure. Representative ones are betaine, imidazoline, amine oxide, sodium amphoteric acetic acid, etc. The present application finds that betaine has the best thickening effect, safety, and use feeling, and can be combined with component (e) to form a pearl product.

[0050] Further, the (d) amphoteric surfactant is a betaine amphoteric surfactant. The betaine amphoteric surfactant is selected from one or more of alkyl betaine (Formula I), alkyl amido propyl betaine (Formula II), alkyl hydroxysulfobetaine (Formula III), and alkyl amido propyl hydroxysulfobetaine (Formula IV).

[0051]

[0052] The amount of (d) amphoteric surfactant is related to the amount of free N-long chain acyl amino acid and nonionic surfactant. If the amount of free N-long chain acyl amino acid or nonionic surfactant is high, the amount of (d) amphoteric surfactant can be appropriately reduced. Conversely, if the amount of free N-long chain acyl amino acid or nonionic surfactant is low, the amount of (d) amphoteric surfactant can be appropriately increased. Generally, the amount of (d) amphoteric surfactant in the cleansing composition having pearlescence is 0.1 to 15% by weight (both refer to the amount after folding), preferably 1 to 10% by weight, further preferably 2 to 8% by weight. For example, it can be 0.5% by weight, 0.7% by weight, 1% by weight, 2% by weight, 3% by weight, 4% by weight, 5% by weight, 6% by weight, 7% by weight, 8% by weight. As the amount of (d) amphoteric surfactant increases, the thickening effect gradually weakens, and it will also affect the wash feel / touch of the product.

[0053] For component (e), the present application finds that by introducing sodium lauroyl methyl isethionate or sodium lauryl isethionate, stable pearlescence can be formed at room temperature and low temperature. While other sulfonate surfactants such as α-olefin sulfonate (representative components: sodium C14-16 α-olefin sulfonate, sodium C12-14 α-olefin sulfonate), succinate sulfonate (representative components: lauryl ether sulfosuccinate disodium, dioctyl sulfosuccinate sodium) cannot obtain pearlescence.

[0054] The amount of component (e) in the cleansing composition having pearlescence is recommended to be controlled at 1 to 30% by weight (both refer to the amount after folding), preferably 1 to 20% by weight, for example, it can be 2% by weight, 3% by weight, 4% by weight, 5% by weight, 6% by weight, 7% by weight, 8% by weight, 9% by weight, 10% by weight, 15% by weight, 20% by weight. The higher the content of component (e), the more conducive to thickening, but too high an amount will destroy the refreshing wash feel of the amino acid surfactant, especially lauroyl alanine.

[0055] The cleansing composition having pearlescence can further comprise other ingredients, such as preservatives, fragrances / flavors, conditioning agents, dyes, chelating agents, extracts, amino acids, nucleic acids, vitamins, enzymes, anti-inflammatory agents, bactericides, antioxidants, ultraviolet absorbers, antiperspirants, pH adjusters, etc.

[0056] The cleansing composition having pearlescence of the present application can be used to prepare personal care products, household cleaning products, industrial cleaning products, etc. The personal care products are shower gels, shampoos, facial cleansers, makeup removers, shaving products or hand washing liquids; the household cleaning products are laundry detergents, dishwashing detergents, furniture and floor cleaners, fabric cleaners or kitchen cleaners.

[0057] In various embodiments, the detailed circumstances, type selection, dosage selection, etc. not discussed can refer to the relevant guidance of other embodiments without conflict in content. For the sake of brevity, various embodiments are not described one by one.

[0058] Unless otherwise specified, "above", "below", "A~B" in the present application all contain the number. Because the solid content of raw materials from different manufacturers is different, the weight percentage content wt% of each raw material described in the present application refers to the weight percentage content after the component is folded. For example, adding 10wt% of sodium cocoyl amino propionate (30% solid content), in fact, the real content of sodium cocoyl amino propionate after folding is 3wt%.

[0059] Compared with the prior art, the present application has the beneficial technical effects:

[0060] 1. It is found for the first time that in the presence of free N-long-chain acyl amino acid, the combination of (c) hydrophilic nonionic surfactant and (d) amphoteric surfactant can significantly improve the viscosity of the formula through synergistic effect.

[0061] 2. By introducing specific (e) component sodium lauroyl methyl isethionate or sodium lauryl isethionate, a self-thickening pearlescent product can be obtained. BRIEF DESCRIPTION OF DRAWINGS

[0062] Figure 1 Product photos for example formulas 4-7.

[0063] Figure 2 Product photos for example formula 4-8.

[0064] The present application will be further described in conjunction with the examples. It should be understood that these examples are only used to illustrate the present application and not used to limit the scope of the present application. Furthermore, it should be understood that after reading the content taught by the present application, those skilled in the art can make various modifications or changes to the present application, and these equivalents also fall within the scope defined by the appended claims of the present application. EXAMPLE

[0065] 1. Test material description

[0066] LA is lauroyl alanine (from Suzhou Vime), Arg is arginine (from Suzhou Vime), CMMEA is cocamide methyl MEA, 430 is sorbitan polyether-30 tetraoleate (purchased from Kawabata), 150 is PEG-150 pentaerythritol tetra stearate (purchased from Huada), 160 is PEG-160 sorbitan triisostearate (purchased from Kawabata), DOE120 is PEG-120 methyl glucose dioleate (purchased from Lubrizol), CAB is cocamide propyl betaine, LAB is lauramide propyl betaine.

[0067] The 30% (e.g. sodium cocoyl amino propionate (30%)) in the raw material means that the raw material is added in the form of a 30% solids solution, for example, 100 g of sodium cocoyl amino propionate (30%) is added, in fact, 30 g of sodium cocoyl amino propionate is added.

[0068] 2. Test instrument

[0069] Viscometer: Lcden rotational viscometer, model LC-NDJ-55.

[0070] 3. Test process

[0071] Unless otherwise specified, the components are weighed according to the formula, heated to 70-85°C, and kept stirring until uniform, and the sample is taken out after the sample is stable, the appropriate rotor and speed are selected, and the sample viscosity is tested by the viscometer. The low temperature test is observed after being kept at -5°C for 48 h.

[0072] Table 1.1 Influence of free N-long chain acyl amino acid (sodium cocoyl amino propionate)

[0073]

[0074] The results show that for the formula containing sodium cocoyl amino propionate, if the free N-long chain acyl amino acid is absent, the solution has almost no viscosity; but after the addition of lauroyl alanine, the viscosity increases by several tens of times, and the solution is transparent and has good low temperature stability.

[0075] Table 1.2 Influence of free N-long chain acyl amino acid (lauroyl glycine, LA)

[0076]

[0077]

[0078] The results show that whether it is lauroyl glycine or lauroyl alanine, if it is completely neutralized with alkali, at this time there is no free N-long chain acyl amino acid, the formula solution has almost no viscosity; if it is partially neutralized with alkali (80% neutralization), about 20% of the N-long chain acyl amino acid in the formula is in a free state, at this time the solution viscosity increases significantly.

[0079] Table 1.3 Influence of free N-long chain acyl amino acid (lauroyl sarcosine)

[0080]

[0081]

[0082] The results show that, for the formula containing lauroyl amino acids, if free N-long chain acyl amino acid is absent (100% neutralized with base), the solution has no viscosity; but if it is partially neutralized with base (80% neutralized), the solution viscosity increases, especially when the hydrophilic nonionic surfactant is 150 or 160, the viscosity increases significantly.

[0083] Table 1.4 Influence of free N-long chain acyl amino acid (LA)

[0084]

[0085]

[0086] The results show that, compared with lauroyl amino acids (1-9 to 1-12), the thickening effect of the formula containing lauroyl alanine (1-13 to 1-20) is increased by more than 5-10 times. The low-temperature stability of lauroyl alanine partially neutralized with basic amino acid (arginine) is significantly better than that of lauroyl alanine partially neutralized with inorganic base (sodium hydroxide).

[0087] Table 2 Influence of amphoteric surfactant

[0088]

[0089] The results show that, if the amphoteric surfactant is absent in the formula, the solution has low viscosity. Among the amphoteric surfactants, the betaine amphoteric surfactant has the best thickening effect under the same conditions.

[0090] Table 3.1 Influence of hydrophilic nonionic surfactant

[0091]

[0092]

[0093]

[0094] The results show that, if the hydrophilic nonionic surfactant is absent in the formula, the solution has low viscosity. The more polyoxyethylene units (PEG units) of the hydrophilic nonionic surfactant, the more conducive to thickening and improving the transparency and low-temperature stability of the formula (preferably PEG is above 50). In formula 3-10, the presence of PEG-100 stearate effectively improves the viscosity of the formula, but the presence of non-hydrophilic glyceryl stearate causes the appearance to be semi-transparent and semi-foggy. In addition, the three-dimensional spatial structure of the hydrophilic nonionic surfactant (such as 150) is also conducive to improving the thickening ability.

[0095] Table 3.2 Influence of hydrophilic nonionic surfactant

[0096]

[0097]

[0098] The results show that the alkyl alkanolamide nonionic surfactants have stronger thickening ability than the alkyl glycoside nonionic surfactants, but weaker than the PEG nonionic surfactants with more than 50 PEG units. The Span (HLB 4.3) has no PEG unit and has poor thickening performance. The Tween is limited by its only 20 PEG units and the hydrophilic group has weak hydrophilicity, resulting in limited thickening ability.

[0099] Table 3.3 Influence of hydrophilic nonionic surfactants

[0100]

[0101]

[0102]

[0103] The results show that the more polyglyceryl units of the hydrophilic nonionic surfactants, the more beneficial to thickening and improving the transparency of the formula (preferably more than 6 polyglyceryl units). In addition, the branched / three-dimensional spatial structure of the hydrophilic nonionic surfactants is beneficial to improving the thickening ability (such as formula 3-16, 3-22); the number of carbon atoms of the hydrophobic group is less than 10, which is not conducive to thickening (such as formula 3-28, 3-29), and the number of carbon atoms is particularly preferred to be about 12. The non-hydrophilic nonionic surfactants such as polyglyceryl-10 decaisostearate (HLB about 3) and polyglyceryl-10 decaoleate (HLB 3) have relatively poor thickening effect and formula transparency.

[0104] Table 4 Influence of component (e) (wt% is the content after folding 100 times)

[0105]

[0106]

[0107] The results show that when the (e) component is selected as sodium lauroyl methyl isethionate (see product photos of formula Figure 1 ) or sodium lauryl isethionate (see product photos of formula Figure 2 ), a stable pearl product at room temperature and low temperature can be obtained.

[0108] In addition, those skilled in the art can understand that although some embodiments described herein include certain features included in other embodiments rather than other features, the combination of features of different embodiments means that it is within the scope of the present application and forms different embodiments.

Claims

1. A cleaning composition having a pearlescent finish, characterized in that, The composition comprises (a) a salt of an N-long-chain acyl amino acid, (b) a free N-long-chain acyl amino acid, (c) a hydrophilic nonionic surfactant, and (d) an amphoteric surfactant. Alternatively, the composition comprises (a') an N-long-chain acyl amino acid neutralized with an alkali portion to a degree of neutralization of less than 100%, such that it contains unneutralized free N-long-chain acyl amino acids, (c) a hydrophilic nonionic surfactant, and (d) an amphoteric surfactant. Alternatively, the composition comprises (a”) a base and an N-long-chain acyl amino acid, wherein the molar number of the base is less than that of the N-long-chain acyl amino acid, such that the neutralization degree of the N-long-chain acyl amino acid is less than 100%, thereby containing free N-long-chain acyl amino acids, (c) a hydrophilic nonionic surfactant, and (d) an amphoteric surfactant. Furthermore, (d) the amphoteric surfactant is a betaine-based amphoteric surfactant; Furthermore, the composition further comprises (e) sodium lauroyl methyl hydroxyethyl sulfonate or sodium lauryl hydroxyethyl sulfonate.

2. The pearlescent cleaning composition according to claim 1, characterized in that, The N-long chain acyl group in the N-long chain acyl amino acid is derived from saturated or unsaturated straight-chain or branched fatty acids with 8 to 22 carbon atoms. And / or, the amino acids in the N-long-chain acyl amino acids are derived from one or more of alanine, glycine, glutamic acid, sarcosine, arginine, lysine, and (methyl)taurine; And / or, the salt of the N-long-chain acyl amino acid is one or more of the following: inorganic base salt, organic amine salt, and basic amino acid salt of N-long-chain acyl amino acid; And / or, the base is selected from one or more of inorganic bases, organic amines, and basic amino acids.

3. The pearlescent cleaning composition according to claim 1, characterized in that, The N-long-chain acyl amino acid mentioned in (a), (a'), (a”), and (b) is lauroyl alanine.

4. The pearlescent cleaning composition according to claim 1, characterized in that, (c) The hydrophilic nonionic surfactant is an O / W type emulsifier; or a solubilizing nonionic surfactant; or a nonionic surfactant with HLB of 6 or more, preferably 8 or more, and more preferably 10 or more.

5. The pearlescent cleaning composition according to claim 1, characterized in that, (c) The hydrophilic nonionic surfactant has a hydrophilicity value of 15 or higher, preferably 20 or higher, more preferably 25 or higher, wherein the hydrophilicity value is equal to the sum of the values ​​assigned to all hydrophilic chemical groups in the surfactant based on the Davis method.

6. The pearlescent cleaning composition according to claim 1, characterized in that, (c) The hydrophilic nonionic surfactant has a hydrophilic group comprising polyoxyethylene units, preferably having 50 or more polyoxyethylene units; and / or, the hydrophilic nonionic surfactant has a hydrophilic group comprising polyglycerol units, preferably having 6 or more polyglycerol units.

7. The pearlescent cleaning composition according to claim 1, characterized in that, (c) The hydrophilic nonionic surfactant includes one or more of PEG-120 methylglucose difatty acid ester, PEG-120 methylglucose trifatty acid ester, PEG-150 pentaerythritol tetrafatty acid ester, PEG-160 sorbitol trifatty acid ester, PEG-100 fatty acid ester, polyglycerol-3 methylglucose difatty acid ester, and polyglycerol-10 fatty acid ester.

8. The pearlescent cleaning composition according to claim 1, characterized in that, The component (e) is present in the cleaning composition at a weight percentage of 1-20 wt%, preferably 2-15 wt%.

9. The pearlescent cleaning composition according to claim 1, characterized in that, (c) The hydrophilic nonionic surfactant in the cleaning composition is 0.05-5 wt%, preferably 0.1-4 wt% by weight; And / or, (d) the amphoteric surfactant is present in the composition at a weight percentage of 0.1-15 wt%, preferably 1-10 wt%.

10. The use of a pearlescent cleaning composition as described in any one of claims 1-9 in the preparation of personal care products, household cleaning products, and industrial cleaning products.

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