Rust red gel composition

Abstract

The invention discloses a rust red gel composition and application thereof. The rust red gel composition comprises (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 ampholytic surfactant, and the ampholytic surfactant (d) is selected from hexadecyl-octadecyl dimethyl hydroxypropyl sulfobetaine. The related rust red gel can be used for preparing personal care products, household cleaning products and industrial cleaning products.

Description

Technical Field

[0001] This invention relates to the field of cleaning and care technology, and in particular to a rust-red gel composition and its application in personal care products, household cleaning products, and industrial cleaning products. Background Technology

[0002] In the research and development of daily chemical products and cosmetics, both "appearance" and "efficacy" often play important roles. Consumers expect personal care products to not only cleanse and care for their skin, but also provide a sense of beauty. In recent years, various products focusing on "appearance" have gradually entered the public eye. Examples include "suspended petal shower gel," colored shampoo beads, and color-changing shower gel.

[0003] Taking colored shower gel as an example, the purpose of coloring is usually achieved through pigments / pigments. However, the addition of pigments / pigments may cause some irritation to the system and have an adverse effect on safety and stability.

[0004] While anionic surfactants such as alkyl sulfates and polyoxyethylene alkyl sulfates have been widely used as surfactants in hair / body cleansing bases, they can sometimes cause dryness and irritation due to increased shampooing / showering frequency in recent years, thus necessitating cleaners with less irritation. Furthermore, these are petroleum-derived surfactants, which contradicts current trends towards sustainability and environmental protection.

[0005] The cosmetics and personal care industry has recognized the growing popularity and importance of sulfate-free and dioxane-free personal care cleaning products containing environmentally friendly, sustainable, and gentle surfactants. Amino acid-based surfactants are considered "greener," gentler, and more sustainable than traditional petroleum-based surfactants.

[0006] Currently, there is a lack of amino acid cleaning systems that can achieve color functionality solely through the self-thickening properties of the formulation system without the addition of pigments / colorants. Summary of the Invention

[0007] The inventors discovered that for amino acid surfactant cleaning systems containing N-long-chain acyl amino acid salts, the synergistic effect of (c) a hydrophilic nonionic surfactant and (d) an amphoteric surfactant in the presence of free N-long-chain acyl amino acids can significantly improve the viscosity of the formulation.

[0008] The inventors have previously obtained temperature-sensitive cleaning compositions by introducing component (e) sodium cocoyl ethanesulfonate or by screening specific types of (d) amphoteric surfactants. However, previous studies have mainly focused on white pearlescent products, which have relatively monotonous colors. This invention focuses on forming colored gel products, such as red ones.

[0009] Specifically, the present invention provides the following technical solution.

[0010] The present invention provides a rust-red gel composition comprising (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.

[0011] Alternatively, the rust-red gel composition comprises (a') N-long-chain acyl amino acids partially neutralized with an alkali, (c) a hydrophilic nonionic surfactant, and (d) an amphoteric surfactant. Wherein, (a') the N-long-chain acyl amino acids partially neutralized with an alkali refers to the product of the partial neutralization of N-long-chain acyl amino acids with an alkali, the final product present in the rust-red gel being the salt of the N-long-chain acyl amino acid and the unneutralized free N-long-chain acyl amino acid.

[0012] Alternatively, the rust-red gel composition comprises (a”) a base and N-long-chain acyl amino acids, wherein the molar number of the base is less than that of the N-long-chain acyl amino acids, resulting in a neutralization degree of less than 100% for the N-long-chain acyl amino acids; (c) a hydrophilic nonionic surfactant; and (d) an amphoteric surfactant. Although the base and N-long-chain acyl amino acids are added to the formulation separately, they will inevitably react. Due to the neutralization degree being less than 100%, what ultimately exists in the gel are the salts of the N-long-chain acyl amino acids and unneutralized free N-long-chain acyl amino acids.

[0013] The inventors were surprised to find that when the (d) amphoteric surfactant was selected as hexadecyl dimethyl hydroxypropyl sulfobetaine, a rust-red gel product could be obtained without the addition of pigments / colorants.

[0014] 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 straight-chain or branched fatty acid with 8 to 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, and palm oil fatty acyl, preferably coconut oil fatty acyl or lauroyl, and most preferably lauroyl.

[0015] The amino acids in the N-long-chain acyl amino acids are derived from one or more of glycine, alanine, glutamic acid, sarcosine, aspartic acid, leucine, isoleucine, valine, threonine, proline, phenylalanine, arginine, lysine, and (methyl)taurine. Further, 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, preferably alanine, and most preferably L-alanine. The N-long-chain acyl (methyl)taurine described in this invention refers to N-long-chain acylmethyl taurine or N-long-chain acyl taurine.

[0016] As an example, N-long-chain acyl amino acids can be selected from cocoyl alanine, lauroyl alanine, cocoyl sarcosine, lauroyl sarcosine, lauroyl glutamic acid, cocoyl glutamic acid, oleyl glutamic acid, cocoyl glycine, lauroyl glycine, stearoyl glutamic acid, etc.

[0017] This invention discovers that N-long-chain acyl amino acids with different structures exhibit varying thickening abilities. Free N-long-chain acylglutamic acid has a weaker thickening effect than its counterparts, N-long-chain acylalanine, glycine, and sarcosine. N-long-chain acylglycine possesses good thickening ability, but its formulation is prone to precipitation and exhibits poor stability, making it suitable for paste-like products where high transparency is not required. The surprising discovery of this invention is that, under the same formulation conditions, lauroylalanine's thickening ability far surpasses that of other long-chain acyl amino acids, being 5-10 times stronger than similar structures such as lauroylsarcosine and cocoylalanine (cocoylaminopropionic acid). This superior, much-anticipated thickening ability can completely solve the problem of poor thickening in amino acid surfactant systems and can completely replace the traditional AES system.

[0018] (a) A salt of an N-long-chain acyl amino acid is a salt formed by an N-long-chain acyl amino acid and a base. The base is selected from one or more of inorganic bases, organic amines, and basic amino acids. The inorganic base is selected from one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, and potassium carbonate, preferably sodium hydroxide or potassium hydroxide. The organic amine is selected from amines, alkanolamines, etc. For basic amino acids, it is selected from one or more of arginine, lysine, citrulline, ornithine, creatine, histidine, diaminobutyric acid, and diaminopropionic acid, preferably arginine and / or lysine, and most preferably L-arginine. The bases described in (a') and (a”) also have the same definition.

[0019] N-long-chain acyl amino acids can be directly mixed into commercially available long-chain acyl amino acid salts such as Puji's YB02-30 (sodium cocoylaminopropionate), AS02-30 (sodium lauroyl sarcosinate), Tianci's AMIN LS30 (sodium lauroyl sarcosinate), Suzhou Weimei's LA-Arg 30 (lauroyl alanine arginine salt), and LA-Na 30 (sodium lauroyl alanine), or N-long-chain acyl amino acids can be directly mixed into a formulation containing (a) N-long-chain acyl amino acid salts to obtain (a) N-long-chain acyl amino acid salts and (b) free N-long-chain acyl amino acids.

[0020] Alternatively, N-long-chain acyl amino acids can be partially neutralized with a base to obtain (a') N-long-chain acyl amino acids partially neutralized with a base. Alternatively, a base and an N-long-chain acyl amino acid can be added to the formulation separately (corresponding to (a')). Since the base is used for partial neutralization and the N-long-chain acyl amino acid is in excess, the system will contain both the neutralized N-long-chain acyl amino acid salt and the unneutralized free N-long-chain acyl amino acid, which is essentially equivalent to (a) the salt of the N-long-chain acyl amino acid + (b) the free N-long-chain acyl amino acid.

[0021] Increasing the amount of N-long-chain acyl amino acid salts and free N-long-chain acyl amino acids can improve the viscosity of the composition. However, excessive amounts will result in an overly viscous formulation, while insufficient amounts will lead to insufficient viscosity. Formulators can choose the appropriate amount based on the viscosity requirements of the actual product; alternatively, if the viscosity is too high, it can be reduced by diluting with water.

[0022] Further, the weight percentage of (a), (a'), or (a”) in the thickening composition is 3-30 wt%, preferably 5-25 wt%, more preferably 8-15 wt%. For example, it can be 4 wt%, 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%, 10 wt%, 11 wt%, 12 wt%, 13 wt%, 14 wt%, 15 wt%, 16 wt%, 17 wt%, 18 wt%, 19 wt%, 20 wt%, 21 wt%, 22 wt%, 23 wt%, 24 wt%, 25 wt%, 26 wt%, 2 7 wt%, 28 wt%, 29 wt%, 30 wt%. Appropriate amounts of N-long-chain acyl amino acids and / or salts allow the formulation to balance cleaning power and washing feel. Particularly preferred is that the N-long-chain acyl amino acid and / or salt is the main surfactant in the formulation; the main surfactant is defined as the surfactant present in the highest weight percentage among all surfactants. Preferably, the main surfactant accounts for more than 50 wt% of all surfactants; for example, more than 55 wt%, 60 wt%, 65 wt%, 70 wt%, 75 wt%, or 80 wt%.

[0023] Furthermore, (b) the free N-long-chain acyl amino acid in the thickening composition has a weight percentage of 0.3-8 wt%, preferably 0.5-6 wt%, and more preferably 1-5 wt%. For example, it can be 0.5 wt%, 1 wt%, 2 wt%, 3 wt%, 4 wt%, 5 wt%, 6 wt%, 7 wt%, or 8 wt%. A suitable amount of free N-long-chain acyl amino acid can balance the viscosity, washability, and low-temperature stability of the formulation.

[0024] Furthermore, for (a') and (a”), the degree of neutralization is controlled to be above 65%, preferably above 70%, more preferably above 75%; and the degree of neutralization is below 95%, preferably below 90%, more preferably below 85%. For example, the degree of neutralization is 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 8 4%, 85%, 86%, 87%, 88%, 89%, 90%. Too low a neutralization rate results in poor low-temperature stability and easy precipitation in the formulation. Too high a neutralization rate results in insufficient free N-long-chain acyl amino acids, limiting the thickening effect. The aforementioned neutralization degree refers to the percentage of N-long-chain acyl amino acids that are neutralized. For example, 80% neutralization means that 80% of all N-long-chain acyl amino acids are neutralized by alkali to form salts, leaving 20% ​​as free N-long-chain acyl amino acids.

[0025] Furthermore, for (a”), the N-long-chain acyl amino acid in the thickening composition is 3-30 wt%, preferably 5-25 wt%, more preferably 8-15 wt%, for example, 4 wt%, 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%, 10 wt%, 11 wt%, 12 wt%, 13 wt%, 14 wt%, 15 wt%, 16 wt%, 17 wt%, 18 wt%, 19 wt%, 20 wt%. The amount of alkali is adjusted according to the selected degree of neutralization.

[0026] The synthesis process of N-long-chain acyl amino acid surfactants can refer to the general synthesis methods of N-acyl amino acid type surfactants, and is divided into direct methods and indirect methods. Direct synthesis methods from fatty acid raw materials include enzymatic synthesis and dehydration condensation. Indirect synthesis methods include acylation of fatty acid acyl chlorides, hydrolytic acylation of fatty acid nitriles, acylation of fatty acid anhydrides, and amide carbonylation reactions. A preferred method is preparation via the amino reaction of fatty acyl chlorides with amino acids (Shotten-Baumann condensation reaction or Shotten-Baumann reaction).

[0027] A typical preparation process suitable for this invention is as follows: amino acids and sodium hydroxide are dissolved in water or a mixture of water and acetone to obtain an amino acid salt solution; then lauroyl chloride and sodium hydroxide solution are slowly added dropwise to the amino acid salt solution, controlling the pH of the reaction system; after the addition is complete, post-processing of the product is performed. Representative methods are disclosed in CN1798821A, US6703517B2, CN102875409B, JPH0570418A, etc.

[0028] For the post-processing of N-long-chain acyl amino acid products, conventional methods such as recrystallization, water washing, and drying can be used. A preferred post-processing step includes the following steps: mixing the crude N-long-chain acyl amino acid with a solvent, optionally stirring, and controlling the temperature T of the mixed system to be above the melting point of the long-chain fatty acid and below the melting point of the N-long-chain acyl amino acid. The solvent is water, an organic solvent, or a mixture of water and an organic solvent. After temperature control, solid-liquid separation is performed. Related methods are disclosed by the inventors in CN202210867760.7 and PCT / CN2022 / 107270, the contents of which are incorporated herein by reference.

[0029] For component (c), hydrophilic nonionic surfactants, it refers to a class of nonionic surfactants that are hydrophilic and can be dispersed or dissolved in water to form emulsions or translucent to transparent solutions.

[0030] The present invention primarily prefers O / W type emulsifiers, or solubilizing nonionic surfactants, or nonionic surfactants with HLB 6 or higher.

[0031] The O / W type emulsifier refers to a type of substance that enables the oil phase (O, abbreviated as O) to be uniformly dispersed in the aqueous phase (W, abbreviated as W) in the form of tiny droplets, forming an oil-in-water (O / W) emulsion. In this invention, the O / W type emulsifier can stabilize free N-long-chain acyl amino acids, ensuring they do not precipitate, and can also have a synergistic effect on thickening.

[0032] The solubilizing nonionic surfactant refers to a nonionic surfactant with solubilizing properties, which can dissolve lipophilic raw materials in water. In this invention, it specifically refers to a surfactant that can dissolve lipophilic free N-long-chain acyl amino acids in water, ensuring that they do not precipitate, and can also have a synergistic effect on thickening.

[0033] For nonionic surfactants with an HLB value of 6 or higher, the HLB value reflects the relative strength of the hydrophilic and lipophilic groups, indicating their partitioning ability in the aqueous and oil phases. An HLB value of 6 or higher can maximize the stability of free N-long-chain acyl amino acids. This invention particularly prefers nonionic surfactants with an HLB value of 8 or higher, more preferably 10, 12, or even 14 or higher. If the HLB value is too low (e.g., 2, 3, 4), its hydrophilicity is too weak, which is not conducive to thickening, nor to maintaining the transparency and low-temperature stability of the formulation. If the HLB value is high, for example, 14 or higher, it will be very beneficial for thickening and maintaining the low-temperature stability of the formulation. 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, and 35. This invention has found that HLB values ​​of 12 or higher, such as 12, 14, 16, or 18, are highly advantageous for producing completely transparent products. Exemplary examples of HLB values ​​above 12 include PEG-120 methyl glucoside dioleate, PEG-150 pentaerythritol tetrastearate, polyglycerol-10 laurate, and PEG-160 sorbitan triisostearate.

[0034] The aforementioned HLB only reflects the relative strength of hydrophilic and lipophilic groups. This invention also unexpectedly discovered that the hydrophilicity of the hydrophilic groups themselves has a significant impact on thickening. To further improve the thickening effect, in addition to HLB, it is necessary to focus on the hydrophilicity of the hydrophilic groups themselves.

[0035] To facilitate the characterization of the hydrophilic contribution of hydrophilic groups (defined in this invention as the "hydrophilicity value"), this invention adopts the Davis method from HLB calculation methods. According to the Davis method, each chemical group (such as –OH, –COO-, –CH3, etc.) is assigned a numerical value reflecting its hydrophilicity or lipophilicity. In this invention, 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.

[0036] For example, for hydrophilic groups, -OH (hydroxyl group) has a value of +1.9, -O- (ether group) has a value of +1.3, -COO- (ester group) has a value of +2.4, -COOH (carboxyl group) has a value of +2.1, -SO3- (sulfonic acid group) has a value of +11.0, -(CH2-CH2-O)- (polyoxyethylene unit EO) has a value of +0.33, and -O-CH2CH(OH)CH2- (polyglycerol unit) has a value of 1.77, etc. More values ​​can be found in the values ​​disclosed in the Davis method. The overall value of the dehydrated sorbitol ring is -1.5. Since it is already negative, it is not considered a hydrophilic group in this invention. (c) If the hydrophilicity value of a hydrophilic nonionic surfactant is too low, its thickening effect is limited, and it is impossible to obtain a product with ultra-high viscosity; increasing the hydrophilicity value is beneficial to improving the thickening performance.

[0037] For example, for Tween 20, calculated using the Davis method, its hydrophilicity value = 5.7 (3 -OH groups) + 2.4 (1 ester group) + 6.6 (20EO) = 14.7. Although Tween 20 has a high overall HLB value, its thickening effect is limited due to its hydrophilicity value of only 14.7. For PEG-20 glyceryl triisostearate, its hydrophilicity value = 7.2 (3 ester groups) + 6.6 (20EO) = 13.8; for PEG-40 dehydrated sorbitan stearate, its corresponding hydrophilicity value = 5.7 (3 -OH groups) + 2.4 (1 ester group) + 13.2 (40EO) = 21.3; for PEG-60 glyceryl isostearate, its corresponding hydrophilicity value = 3.8 (2 -OH groups) + 2.4 (1 ester group) + 19.8 (60EO) = 26; for polyglycerol-6 monooleate, The corresponding hydrophilicity value is 10.62 (6 polyglycerol units -O-CH2CH(OH)CH2-) + 1.9 (1 -OH) + 2.4 (ester group) = 14.92; for polyglycerol-8 monooleate, the corresponding hydrophilicity value is 14.16 (8 polyglycerol units) + 1.9 (1 -OH) + 2.4 (ester group) = 18.46; for polyglycerol-10 laurate, the corresponding hydrophilicity value is 17.7 (10 polyglycerol units) + 1.9 (1 -OH) + 2.4 (ester group) = 22. PEG-20 glycerol triisostearate and polyglycerol-6 monooleate have relatively low hydrophilicity values, resulting in limited thickening effects. With increasing hydrophilicity value, under the same conditions, it is beneficial to enhance the thickening ability of nonionic surfactants. The present invention preferably (c) has a hydrophilicity value of 15 or higher for the hydrophilic nonionic surfactant (calculated based on the Davis method), and more preferably 20, 25 or even 30 or higher.

[0038] Furthermore, (c) the hydrophilic nonionic surfactant can be of the polyoxyethylene type, polyol type, alkylamide type, etc. Preferably, the hydrophilic nonionic surfactant of this invention comprises a polyoxyethylene unit or a polyglycerol unit in its hydrophilic group.

[0039] Polyoxyethylene units can be understood as EO repeating units, PEG units, or oxyethylene units. The higher the number of polyoxyethylene units, the better the hydrophilicity, which is beneficial for thickening and low-temperature stability. It is advantageous to have more than 50 PEG units, preferably 60, 80, or 100 or more, such as 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, and 160. For example, substances with high PEG unit numbers, such as PEG-120 methyl glucoside dioleate, PEG-150 pentaerythritol tetrastearate, PEG-160 sorbitan triisostearate, PEG-100 stearate, and PEG-60 glyceryl isostearate, all exhibit excellent thickening and low-temperature stability.

[0040] Polyglycerol units refer to polyglycerol groups obtained by glycerol polymerization. The more polyglycerol units there are, the better the hydrophilicity, which is more beneficial for thickening and low-temperature stability. It is more advantageous to have 6 or more polyglycerol units, preferably 8 or 10 or more, for example, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20.

[0041] Furthermore, this invention has found that the number of carbon atoms in the hydrophobic group of a hydrophilic nonionic surfactant affects its thickening properties. A carbon number greater than 10 (e.g., cocoyl, lauryl, stearyl) is beneficial for thickening. A carbon number less than 10 (e.g., octyl, decyl) is detrimental to thickening. Additionally, branched hydrophobic groups are beneficial for thickening. For example, polyglycerol-10 monoisostearate is superior to polyglycerol-10 monostearate. This may be because the branched structure enhances the three-dimensional spatial structure of the surfactant.

[0042] Besides hydrophilicity and HLB value, the spatial configuration of (c) hydrophilic nonionic surfactants is also very important. For example, nonionic surfactants with low HLB values ​​may still have good thickening properties if they have a three-dimensional spatial structure. Typically, if the chemical structure of (c) hydrophilic nonionic surfactants has two or more hydrophobic groups, especially three or more, it will not be a linear structure but a three-dimensional spatial structure. It is speculated that this spatial structure can effectively promote the formation of micelle aggregates.

[0043] In addition, nonionic surfactants derived from polyhydroxy compounds such as pentaerythritol, glucose / methylglucose, dehydrated sorbitol, sorbitol, and glycerol are generally obtained by esterification of polyhydroxy compounds, hydrophilic compounds (such as ethylene oxide and polyglycerol), and fatty acids. The hydroxyl groups are connected to two or more (preferably three or more) hydrophobic groups, and they have the aforementioned three-dimensional spatial structure.

[0044] The amount of (c) hydrophilic nonionic surfactant is related to the amount of free N-long-chain acyl amino acid and 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 (all converted to 100%) of (c) hydrophilic nonionic surfactant in the rust-red gel composition is 0.05-5 wt%, preferably 0.1-4 wt%, more 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%, or 5 wt%. (c) Excessive use of hydrophilic nonionic surfactants, although beneficial for thickening, can affect the washing feel / touch of the product to some extent.

[0045] For component (d), the amphoteric surfactant refers to a surfactant whose molecular structure contains both anionic groups (such as carboxylate, sulfonate, and phosphate groups) and cationic groups (such as ammonium and quaternary ammonium groups). Representative examples include betaines, imidazolines, amine oxides, and sodium amphoteric acetates. This invention has discovered that when the (d) amphoteric surfactant is specifically selected from hexadecyldimethylhydroxypropyl sulfobetaine, a unique rust-red gel can be formed.

[0046] The amount of (d) amphoteric surfactant used is related to the amount of free N-long-chain acyl amino acids and nonionic surfactants. If the amount of free N-long-chain acyl amino acids or nonionic surfactants is high, the amount of (d) amphoteric surfactant can be appropriately reduced. Conversely, if the amount of free N-long-chain acyl amino acids or nonionic surfactants is low, the amount of (d) amphoteric surfactant can be appropriately increased. Generally, the weight percentage (all converted to 100%) of (d) amphoteric surfactant in the rust-red gel is 0.1-15 wt%, preferably 1-10 wt%, and more preferably 2-8 wt%. For example, it can be 0.5 wt%, 0.7 wt%, 1 wt%, 2 wt%, 3 wt%, 4 wt%, 5 wt%, 6 wt%, 7 wt%, and 8 wt%. As the amount of (d) amphoteric surfactant increases, its thickening effect gradually decreases, and it will also affect the washing feel / touch of the product.

[0047] The rust-red gel composition may further contain other ingredients such as preservatives, fragrances / flavors, conditioning agents, chelating agents, extracts, amino acids, nucleic acids, vitamins, enzymes, anti-inflammatory agents, bactericides, antioxidants, UV absorbers, antiperspirants, pH adjusters, etc.

[0048] The rust-red gel composition of the present invention can be used to prepare personal care products, household cleaning products, industrial cleaning products, etc. The personal care products include shower gel, shampoo, facial cleanser, makeup remover, shaving products, or hand soap; the household cleaning products include laundry detergent, dish soap, furniture and floor cleaner, fabric cleaner, or kitchen cleaner.

[0049] In each implementation, details such as the selection of types and dosages not discussed can be referred to the relevant guidance of other implementations if there is no conflict in the content. For the sake of brevity, each implementation has not been described in detail.

[0050] Unless otherwise specified, "above," "below," and "A~B" in this invention all include the stated number. Since the solid content of raw materials varies among different manufacturers, the weight percentage (wt%) of each raw material mentioned in this invention refers to the weight percentage of that component after conversion to 100%. For example, if 10wt% sodium cocoaminopropionate (30% solid content) is added, the actual weight percentage of sodium cocoaminopropionate after conversion to 100% is 3wt%.

[0051] Compared with the prior art, the present invention has the following beneficial technical effects:

[0052] 1. This invention is the first to discover that, in the presence of free N-long-chain acyl amino acids, the combination of (c) a hydrophilic nonionic surfactant and (d) an amphoteric surfactant, with the synergistic effect of the three, can significantly improve the viscosity of the formulation.

[0053] 2. The inventors have made a surprising discovery that when (d) the amphoteric surfactant is specifically selected from hexadecyldimethylhydroxypropyl sulfobetaine, a unique rust-red gel can be formed without the addition of pigments / colorants.

[0054] The present invention will be further illustrated below with reference to embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalents also fall within the scope defined by the appended claims. Example

[0055] 1. Description of test materials

[0056] LA stands for lauroyl alanine (from Suzhou Weimei), Arg stands for arginine (from Suzhou Weimei), CMMEA stands for cocamidomethyl MEA, 430 stands for sorbitol polyether-30 tetraoleate (purchased from Kao), 150 stands for PEG-150 pentaerythritol tetrastearate (purchased from Croda), 160 stands for PEG-160 dehydrated sorbitol triisostearate (purchased from Kao), DOE120 stands for PEG-120 methyl glucodioleate (purchased from Lubrizol), CAB stands for cocamidopropyl betaine, and LAB stands for lauroamide propyl betaine.

[0057] The 30% marked in the raw materials (e.g., sodium cocoaminopropionate (30%)) means that the added raw materials are solutions with a solid content of 30%. For example, if 100g of sodium cocoaminopropionate (30%) is added, the actual amount of sodium cocoaminopropionate added is 30g.

[0058] 2. Test instruments

[0059] Viscometer: Lichen rotational viscometer, model LC-NDJ-55.

[0060] 3. Experimental Procedure

[0061] Unless otherwise specified, weigh each component according to the formula, heat to 70-85℃, and keep stirring until homogeneous. After the prepared sample has stabilized, remove it, select a suitable rotor and speed, and test the sample viscosity with a viscometer. Low-temperature testing involves keeping it at -5℃ for 48 hours for observation.

[0062] Table 1.1 Effect of free N-long-chain acyl amino acids (sodium cocoylaminopropionate)

[0063]

[0064] The results showed that for formulations containing sodium cocoylaminopropionate, the solution had almost no viscosity if free N-long-chain acyl amino acids were lacking; however, after adding lauroyl alanine, the viscosity increased by several tens of times, and the solution became transparent and had good low-temperature stability.

[0065] Table 1.2 Effect of free N-long-chain acyl amino acids (lauroyl glycine, LA)

[0066]

[0067] The results showed that, whether it was lauroylglycine or lauroylalanine, if it was completely neutralized with alkali, there were no free N-long-chain acyl amino acids, and the formulation solution had almost no viscosity; if it was partially neutralized with alkali (80% neutralization), about 20% of the N-long-chain acyl amino acids in the formulation were in a free state, and the viscosity of the solution increased significantly.

[0068] Table 1.3 Effect of free N-long-chain acyl amino acids (lauroyl sarcosine)

[0069]

[0070]

[0071] The results showed that for formulations containing lauroyl sarcosine, if the free N-long-chain acyl amino acid is lacking (100% neutralization with alkali), the solution has no viscosity; however, if it is partially neutralized with alkali (80% neutralization), the solution viscosity increases, especially when the hydrophilic nonionic surfactant is 150 or 160, the viscosity increase is significant.

[0072] Table 1.4 Effect of Free N-Long-Chain Acyl Amino Acids (LA)

[0073]

[0074]

[0075] The results showed that, compared to lauroyl sarcosine (1-9 to 1-12), formulations containing lauroyl alanine (1-13 to 1-20) exhibited a thickening effect that was more than 5-10 times better. Partial neutralization of lauroyl alanine with a basic amino acid (arginine) resulted in significantly better low-temperature stability than partial neutralization with an inorganic base (sodium hydroxide).

[0076] Table 2.2 Effect of amphoteric surfactants (160 system)

[0077]

[0078]

[0079] The results showed that when (d) the amphoteric surfactant was selected from hexadecyldimethylhydroxypropylsulfobetaine, a rust-red gel could be formed.

[0080] Table 2.3 Effect of amphoteric surfactants (DOE120 system)

[0081]

[0082]

[0083]

[0084] The results showed that when the hydrophilic nonionic surfactant was replaced with DOE120, and when the (d) amphoteric surfactant was selected from hexadecyldimethylhydroxypropyl sulfobetaine, a rust-red gel could be formed.

[0085] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features included in other embodiments but not others, combinations of features from different embodiments are meant to be within the scope of the invention and form different embodiments.

Claims

1. An iron rust red jelly composition, 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, (d) an amphoteric surfactant; Or, the composition comprises (a') an N-long chain acyl amino acid partially neutralized with a base at less than 100% degree of neutralization so that it contains a salt of an N-long chain acyl amino acid and a free N-long chain acyl amino acid which is not neutralized, (c) a hydrophilic nonionic surfactant, (d) an amphoteric surfactant; Or, the composition comprises (a") a base and an N-long chain acyl amino acid, and the number of moles of the base is less than that of the N-long chain acyl amino acid so that the degree of neutralization of the N-long chain acyl amino acid is less than 100% to contain a salt of an N-long chain acyl amino acid and a free N-long chain acyl amino acid, (c) a hydrophilic nonionic surfactant, (d) an amphoteric surfactant; And, (d) the amphoteric surfactant is hexadecyl octadecyl dimethyl hydroxypropyl sultaine.

2. The rust-red jelly 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 a saturated or unsaturated linear or branched fatty acid having 8 to 22 carbon atoms; And / or, 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; And / or, the salt of the N-long chain acyl amino acid is one or more of an inorganic base salt, an organic amine salt, a basic amino acid salt of the N-long chain acyl amino acid; And / or, the base is selected from one or more of an inorganic base, an organic amine, a basic amino acid.

3. The rust-red jelly composition according to claim 1, characterized in that, The N-long chain acyl amino acid in (a), (a'), (a"), (b) is lauroyl alanine.

4. The rust-red jelly composition according to claim 1, characterized by, The hydrophilic nonionic surfactant in (c) is an O / W type emulsifier; or is a solubilizing type nonionic surfactant; or is a nonionic surfactant having an HLB of 6 or more, preferably 8 or more, more preferably 10 or more.

5. The rust-red jelly composition according to claim 1, characterized in that, The hydrophilic nonionic surfactant in (c) has an HLB of 12 or more.

6. The rust-red jelly composition according to claim 1, characterized in that, The hydrophilic nonionic surfactant in (c) has a hydrophilicity value of 15 or more, preferably 20 or more, more preferably 25 or more, the hydrophilicity value being equal to the sum of the values assigned to all hydrophilic chemical groups in the surfactant according to the Davies method.

7. The rust-red jelly composition according to claim 1, characterized in that, The hydrophilic group of the hydrophilic nonionic surfactant in (c) contains polyoxyethylene units, the number of polyoxyethylene units being 50 or more, preferably 60, 80 or 100 or more; and / or, the hydrophilic group of the hydrophilic nonionic surfactant contains polyglycerol units, the number of polyglycerol units being 6 or more, preferably 8 or 10 or more.

8. The rust-red jelly composition according to claim 1, characterized in that, The hydrophilic nonionic surfactant in (c) contains one or more of PEG-120 methyl glucose difatty acid ester, PEG-120 methyl glucose trifatty acid ester, PEG-150 pentaerythritol tetrafatty acid ester, PEG-160 sorbitan trifatty acid ester, PEG-100 fatty acid ester, polyglyceryl-10 fatty acid ester.

9. The rust-red jelly composition according to claim 1, characterized in that, The weight percent content of component (a), (a') or (a") in the composition is from 3 to 30 wt%, preferably from 5 to 25 wt%, further preferably from 8 to 15 wt%; and / or, (b) the free N-long chain acyl amino acid in the composition is from 0.3 to 8 wt%, preferably from 0.5 to 6 wt%; and / or, (c) the hydrophilic nonionic surfactant in the composition is from 0.05 to 5 wt%, preferably from 0.1 to 4 wt%; and / or, (d) the amphoteric surfactant in the composition is from 0.1 to 15 wt%, preferably from 1 to 10 wt%.

10. Use of a ferrugineous gel composition according to any one of claims 1 to 9 for the preparation of a personal care product, a household cleaning product, an industrial cleaning product.

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