Weakly acidic cream-type cleansing agent composition

Abstract

To provide a weakly acidic creamy detergent composition containing N-acylglycine potassium, supplemented with N-acyl glutamic acid potassium, which excels in the speed of foam generation, foam volume, and foam resilience, uses a reduced amount of anionic surfactant, resists a change in hardness due to temperature, and does not cause separation or syneresis even at 45°C.SOLUTION: A weakly acidic creamy detergent composition contains the following components A-E. The concentration of anionic surfactants including components A and B is 16 mass% or less. The mass ratio of component E to component A, E / A, is 0.06 or more and 0.30 or less. The pH is 5.0 or more and 6.4 or less. Component A: acylglycine potassium at 5 mass% or more and 15 mass% or less, component B: acyl glutamic acid potassium, component C: at least one polyhydric alcohol selected from glycerol, diglycerol, polyglycerol -3, sorbitol, and maltitol at 5 mass% or more and 50 mass% or less, component D: hydroxypropyl starch phosphate, and component E: sodium chloride.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a weakly acidic creamy detergent composition. Background Art

[0002] Creamy detergent compositions have excellent portability and handleability compared to solid soaps and facial wash powders, and are easy to lather by hand, making them the mainstream dosage form in the current facial wash market. In general, creamy detergent compositions containing higher fatty acid salts as main components are known, which can achieve rich foam volume, fine and elastic foam, and a refreshing rinsing feel. However, since they are weakly alkaline, there is a problem of skin irritation, and there is also a problem of tightness after rinsing in terms of use feel. On the other hand, various studies have been conducted on blending N-acylglycine salts into creamy detergent compositions as detergents that are low-irritating, lather well, and have excellent rinsing properties. A creamy detergent composition containing N-acylglycine salt, polyoxyethylene alkyl ether sulfate, betaine-based amphoteric surfactant, inorganic salt and water (Patent Document 1), a creamy detergent composition containing N-acylglycine salt, highly polymerized polyol and polyhydric alcohol (Patent Document 2), and a creamy detergent composition containing N-acylglycine salt, betaine-based amphoteric surfactant, water and organic acid (Patent Document 3) are known.

[0003] However, for creamy detergent compositions containing N-acylglycine salts, it was necessary to blend an anionic surfactant at a high concentration in order to maintain the creamy form. Blending an anionic surfactant at a high concentration has disadvantages such as poor water solubility during use, increased bulk cost, and greater environmental impact. The creamy detergent composition containing N-acylglycine salt has a large change in hardness with temperature, and has problems that it tends to harden at low temperatures, easily liquefy at high temperatures, or the components are prone to separation. The behavior of N-acylglycine salts differs depending on whether they are sodium salts or potassium salts. Sodium N-acylglycinate allows for the relatively easy production of creams with high temperature stability in terms of hardness, but it has limitations in terms of solubility in water, speed of foaming, foam volume, and foam fineness. On the other hand, potassium N-acylglycinate foams faster and produces better foam volume and fineness compared to sodium N-acylglycinate, but it is difficult to maintain a stable creamy consistency. The applicant has developed a stable, creamy detergent composition with excellent usability, mainly composed of N-acylglycine potassium (Patent Document 4), but there is a need for a creamy detergent composition with even better usability. Furthermore, since the aforementioned creamy detergent composition may separate at 45°C, there is a need for a creamy detergent composition with even better high-temperature stability. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2007-269662 [Patent Document 2] Japanese Patent Publication No. 2000-143497 [Patent Document 3] Japanese Patent Publication No. 2001-019632 [Patent Document 4] Japanese Patent Publication No. 2019-142785 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] We found that adding potassium N-acylglutamate to a facial cleansing cream with potassium N-acylglycine as the main ingredient increased the speed of lathering, the amount of foam, and the elasticity of the foam, but we encountered problems such as separation and liquefaction at high temperatures. Therefore, the object of the present invention is to provide a weakly acidic cream-type detergent composition mainly composed of potassium N-acylglycine, which foams quickly and has excellent foam volume, and to further increase the foaming speed, increase the foam volume, and strengthen the foam elasticity by adding potassium N-acyl glutamate, while keeping the amount of anionic surfactant low, and to provide a weakly acidic cream-type detergent composition that has little change in hardness with temperature and does not separate or synergize even at 45°C.

[0006] The present invention is summarized in the following terms: 1. A weakly acidic cream-type detergent composition containing the following components A to E, wherein the concentration of the anionic surfactant containing components A and B is 16% by mass or less, the mass ratio of component E to component A (E / A) is 0.06 or more and 0.30 or less, and the pH is 5.0 or more and 6.4 or less. Component A: Acylglycine potassium 5% to 15% by mass Component B: Potassium acyl glutamate Component C: One or more polyhydric alcohols selected from glycerin, diglycerin, polyglycerin-3, sorbitol, and maltitol, in an amount of 5% to 50% by mass. Component D: Hydroxypropyl starch phosphate E component: Sodium chloride 2. The weakly acidic cream-type cleansing agent composition according to 1, characterized in that component A is potassium cocoyl glycine. [Effects of the Invention]

[0007] In a weakly acidic cream-type detergent composition containing N-acylglycine potassium, we were able to achieve high temperature stability, rapid solubility in water, rapid foaming, sufficient foam volume, excellent foam elasticity, and fine-textured foam. The weakly acidic cream-type detergent composition of the present invention exhibits minimal hardness change with temperature, with a hardness of 100 g / m or less at 5°C and 2 g / m or more at 40°C. Even with the grip strength of an average woman, if the hardness is 100 g / m or less, it is easy to dispense from the tube container, while if the hardness is 2 g / m or more, no dripping occurs when dispensing from the tube container. Furthermore, it exhibits excellent high-temperature stability, and no separation or syneresis occurs even when stored at 45°C for 30 days. The formula maintains its creamy consistency even with a reduced amount of anionic surfactant, achieving high temperature stability. Furthermore, the lower anionic surfactant content accelerates solubility in water, reducing the environmental impact of wastewater and lowering manufacturing costs. By using potassium N-acylglycine, which lathers quickly and produces excellent foam volume but makes it difficult to achieve temperature stability in the cream's hardness, and by combining it with potassium N-acylglutamate, we were able to create a weakly acidic, creamy detergent composition with a low total amount of anionic surfactants. [Modes for carrying out the invention]

[0008] The weakly acidic cream-type cleaning agent composition of the present invention has a weakly acidic pH of 5.0 to 6.4. If the pH exceeds 6.4, it may not become cream-like. A cream-like state is one that combines shape retention and fluidity, so that it does not drip when taken in the hand, and easily collapses and flows when touched. It is suitable for use when filled into tube containers or jar containers. When filled into a tube container, it is preferable that it has enough shape retention to prevent dripping, and that an appropriate amount can be squeezed out from the tube. When filled into a jar container, it is preferable that it has enough shape retention to prevent immediate change in shape even when the container is tilted, and that it has enough fluidity to be easily scooped up with a finger. Specifically, the cream-like state of the present invention is preferably one in which the hardness is between 2g and 100g when measured using a FUDOH rheometer manufactured by Rheotech Co., Ltd., under the following measurement conditions: RANGE: 200g-force, adapter: flat plate φ1cm, sample stage speed: 6cm / min, and entry width: 3cm.

[0009] The weakly acidic cream-type detergent composition of the present invention contains an anionic surfactant containing potassium N-acylglycine and potassium N-acyl glutamate at a concentration of 16% by mass or less. Even at a low concentration of anionic surfactant, it maintains a stable cream state, and due to the low concentration of anionic surfactant, it has good water solubility and excellent foaming properties.

[0010] The potassium acylglycinate, component A used in this invention, is incorporated into the weakly acidic cream-type cleansing agent composition of the present invention at a concentration of 5% to 15% by mass. Compared to sodium acylglycinate, potassium acylglycinate has slightly lower temperature stability in terms of cream hardness, but it dissolves quickly in water and lathers quickly, enabling the creation of an appropriate volume of foam. Examples of potassium acylglycinates include potassium lauroylglycinate, potassium myristoylglycinate, potassium palmitoylglycinate, potassium stearoylglycinate, and potassium cocoylglycinate, and commercially available products can be used. Potassium cocoylglycinate is preferred as the potassium acylglycinate.

[0011] The potassium acyl glutamate, component B used in this invention, is an anionic surfactant commonly used in weakly acidic detergent compositions. Examples of potassium acyl glutamate include potassium palmitoyl glutamate, potassium N-stearoyl glutamate, potassium N-oleoyl glutamate, potassium cocoyl glutamate, potassium N-(coconut fatty acid / palm fatty acid / sunflower fatty acid) potassium acyl glutamate, potassium N-palm oil fatty acid potassium acyl glutamate, potassium N-hydrogenated beef tallow fatty acid potassium acyl glutamate, potassium lauroyl glutamate, and potassium myristoyl glutamate.

[0012] The polyhydric alcohol selected from glycerin, diglycerin, polyglycerin-3, sorbitol, and maltitol, which is component C used in the present invention, is blended into the weakly acidic cream-type cleansing agent composition of the present invention at a concentration of 5% by mass or more and 50% by mass or less.

[0013] The hydroxypropyl starch phosphate as Component D used in the present invention is a product obtained by crosslinking hydroxypropyl starch with phosphoric acid. Hydroxypropyl starch is obtained by reacting starch with propylene oxide. A commercially available product may be used as the hydroxypropyl starch phosphate, and examples thereof include hydroxypropyl starch phosphate "STRUCTURE (trademark) XL" manufactured by Akzo Nobel N.V. The blending amount of hydroxypropyl starch phosphate as Component D used in the present invention is preferably 1% by mass or more and 4% by mass or less.

[0014] Regarding the blending amount of sodium chloride as Component E used in the present invention, the ratio E / A relative to Component A is 0.06 or more and 0.30 or less. If the ratio is less than 0.06, separation occurs at 45°C. In addition, the hardness at 5°C may increase extremely. If the ratio is 0.33 or more, the dissolution rate in water becomes slow, and the foam amount decreases.

[0015] The weakly acidic creamy detergent composition of the present invention is suitable for skin cleansing, and is mainly assumed to be used as a facial cleanser, while it can also be used as a hand cleanser or a body cleanser.

[0016] To the weakly acidic creamy detergent composition of the present invention, anionic surfactants other than Component A and Component B, cationic surfactants, nonionic surfactants, amphoteric surfactants, polyhydric alcohols other than Component C, water-soluble polymers, oil agents, powders, pH adjusters, perfumes, antiseptic / antibacterial agents, stabilizers, and active pharmaceutical ingredients may be blended, within a range that does not impair the effects of the present invention. [Examples]

[0017] [Evaluation of pH, Hardness, and Usability] Weakly acidic creamy detergent compositions of Examples 1 to 34 and Comparative Examples 1 to 19 were prepared according to the formulations in Tables 1 to 10, and their pH, hardness, and usability were evaluated.

[0018] [Production Method] Each component was completely dissolved by heating and stirring, and a weakly acidic cream-type detergent composition was obtained by cooling and defoaming while slowly stirring.

[0019] [pH measurement] The pH of a weakly acidic cream-type detergent composition immediately after manufacturing was measured using a pH meter manufactured by Horiba, Ltd., under conditions of 23°C to 27°C.

[0020] [Evaluation of temperature stability and time-dependent stability of hardness] The prepared weakly acidic cream-type cleaning agent composition was filled into cream bottles in 50g portions and stored in constant temperature rooms at 5°C, 25°C, 40°C, and 45°C. After one month, the hardness was measured immediately after removing the bottles from the constant temperature rooms. The hardness is preferably between 2 g / m² and 100 g / m². If the hardness is less than 2g by weight, dripping will occur when squeezed out of the tube, making it difficult to handle as a cream-like formulation. Therefore, a hardness of 2g by weight or more is required even at 40°C. Although use at 45°C is not anticipated, and therefore a hardness of 2g by weight or more is not required at 45°C, it is possible that the product may be placed in a 45°C environment, so separation at 45°C is not permitted. If the hardness exceeds 100 g / m², it becomes difficult to squeeze the material out of the tube container. Therefore, it is necessary that the hardness remains below 100 g / m² even at 5°C, when the material tends to harden easily. Hardness measurements were performed using a FUDOH rheometer manufactured by Rheotech Co., Ltd., with the following measurement conditions: RANGE: 200 g-force, adapter: flat plate φ1 cm, sample stage speed: 6 cm / min, and entry width: 3 cm.

[0021] [Sensory evaluation test] Three expert panelists took 2g of the sample in their palms, added an appropriate amount of water, and foamed it. They then evaluated its solubility in water, the speed of foaming, the amount of foam, the elasticity of the foam, and the fineness of the foam. Comparative Example 1, which does not contain potassium acyl glutamate (component B), was used as the standard, and the following criteria were used for evaluation. The average of the evaluation scores from three individuals was used as the sensory evaluation test result. A) Water solubility (Water solubility refers to the speed at which a cream-like substance completely changes into foam after contact with water.) 5: Compared to Comparative Example 1, it dissolves in water very quickly. 4. Compared to Comparative Example 1, it dissolves faster in water. 3: Compared to Comparative Example 1, the rate of solubility in water is equivalent. 2: Compared to Comparative Example 1, it dissolves more slowly in water. 1: Compared to Comparative Example 1, it dissolves more slowly in water, and the sample remains on the palm of the hand. B) Speed ​​of foaming 5: Compared to Comparative Example 1, it foams up very quickly. 4. Compared to Comparative Example 1, it foams up faster. 3: The foaming speed is equivalent to that of Comparative Example 1. 2: Compared to Comparative Example 1, it foams more slowly. 1. Compared to Comparative Example 1, it is slow to foam and cannot produce sufficient foam. C) Foam amount 5: Compared to Comparative Example 1, the amount of foam is significantly higher. 4: Compared to Comparative Example 1, the amount of foam is greater. 3: The amount of foam is equivalent to that of Comparative Example 1. 2: Compared to Comparative Example 1, the amount of foam is less. 1. Compared to Comparative Example 1, the amount of foam is less, and it is not possible to create enough foam for washing the face. D) Elasticity of foam (The elasticity of a bubble refers to the resistance felt when pressure is applied to the bubble with your fingers or palm.) 5: Compared to Comparative Example 1, the foam has significantly superior elasticity. 4. Compared to Comparative Example 1, it exhibits superior foam elasticity. 3: The foam elasticity is equivalent to that of Comparative Example 1. 2: Compared to Comparative Example 1, the foam has less elasticity. 1: Compared to Comparative Example 1, the bubbles have less elasticity and collapse easily. E) Fineness of foam texture (The fineness of the bubbles refers to the degree of fineness of the bubble particle size that can be recognized by the naked eye.) 5: Compared to Comparative Example 1, it exhibits significantly superior fineness of foam. 4. Compared to Comparative Example 1, it exhibits superior fineness of foam texture. 3: The fineness of the foam is comparable to that of Comparative Example 1. 2: Compared to Comparative Example 1, the foam is less fine in texture. 1: Compared to Comparative Example 1, the foam texture is significantly inferior.

[0022] [Table 1]

[0023] The weakly acidic cream-type detergent compositions of Examples 1 to 6 were superior in terms of foaming speed, foam volume, and foam elasticity compared to Comparative Example 1 in Table 2, which does not contain potassium acyl glutamate (component B) or hydroxypropyl starch phosphate (component D). They also showed improved stability at 45°C, which was a problem with Comparative Example 1, and remained stable without separation even at 45°C.

[0024] [Table 2]

[0025] Comparative Example 1, a weakly acidic cream-type detergent composition set as the standard for sensory evaluation, did not contain hydroxypropyl starch phosphate (component D), and therefore separated at 45°C. Comparative Example 2, a weakly acidic cream-type detergent composition, contained hydroxypropyl starch phosphate (component D), and therefore did not separate at 45°C, maintaining stability, but its water solubility and foaming ability were inferior to Comparative Example 1. Comparative Examples 4-7 contained potassium acyl glutamate (component B), resulting in superior usability compared to Comparative Example 1, but because they did not contain hydroxypropyl starch phosphate (component D), they separated at 45°C.

[0026] [Table 3]

[0027] Comparative Example 5, which did not contain hydroxypropyl starch phosphate (component D), separated at 45°C, but Examples 7-10, which contained 1.5% to 3% by mass of hydroxypropyl starch phosphate (component D), did not separate at 45°C and maintained their stability.

[0028] [Table 4]

[0029] Examples 11-14, which contained 8-14% by mass of component A, acylglycine potassium, had appropriate hardness and excellent usability. However, Comparative Example 8, which contained 16% by mass of component A, had a hardness of 122 g / m after storage at 5°C for one month, making it difficult to dispense from the tube, and its usability was also poor in terms of water solubility.

[0030] [Table 5]

[0031] Examples 15-19, which contained 5-40% by mass of glycerin as component C, and Examples 20-23, which contained 5-40% by mass of diglycerin as component C, all exhibited excellent hardness, 45°C stability, and usability.

[0032] [Table 6]

[0033] Examples 24 and 25, which contained 10-36% by mass of polyglycerin-3 as component C, Examples 26 and 27, which contained 10-36% by mass of sorbitol as component C, and Examples 28 and 29, which contained 10-36% by mass of maltitol as component C, all exhibited excellent hardness, 45°C stability, and usability.

[0034] [Table 7]

[0035] Comparative Example 9, which contained DPG instead of component C, and Comparative Examples 10, 12, and 13, which did not contain component C, all separated at 45°C and exhibited inferior foam elasticity and foam fineness. Comparative Example 11, which did not contain component C, became liquid immediately after manufacturing and did not form a cream, so its pH, hardness, and usability were not evaluated.

[0036] [Table 8]

[0037] Examples 30-33 had an E / A ratio between 0.07 and 0.25, exhibiting excellent hardness, 45°C stability, and usability. Comparative Examples 14 and 15, with an E / A ratio between 0.03 and 0.05, separated at 45°C. Comparative Example 16, with an E / A ratio of 0.33, exhibited poor water solubility and foaming.

[0038] [Table 9]

[0039] Example 10, which used potassium cocoyl glycinate as component A, exhibited excellent hardness, 45°C stability, and usability. However, Comparative Example 17, which did not contain component A and instead used sodium cocoyl glycinate, was inferior in water solubility and foam fineness.

[0040] [Table 10]

Claims

1. A weakly acidic cream-type detergent composition containing the following components A to E, wherein the concentration of the anionic surfactant containing components A and B is 16% by mass or less, the mass ratio E / A of component E to component A is 0.06 or more and 0.30 or less, and the pH is 5.0 or more and 6.4 or less. Component A: Acylglycine potassium 5% to 15% by mass Component B: Potassium acyl glutamate Component C: One or more polyhydric alcohols selected from glycerin, diglycerin, polyglycerin-3, sorbitol, and maltitol, in an amount of 5% to 50% by mass. Component D: Hydroxypropyl starch phosphate Component E: Sodium Chloride

2. The weakly acidic cream-type cleansing agent composition according to claim 1, characterized in that component A is potassium cocoyl glycine.

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