Pasty body cleanser composition

Abstract

This pasty body cleanser composition comprises: 0.1-6 mass% of an isoparaffin having an average carbon number of 50-250 as a component (A); 0.2-14 mass% of an isoparaffin having an average carbon number of 20-24 as a component (B); 10-50 mass% of a fatty acid salt having 8-22 carbon atoms as a component (C); 5-30 mass% of a polyhydric alcohol having 2-4 carbon atoms and a valence of 2-3 as a component (D); and water, wherein the mass ratio ((A) / (B)) of the component (A) to the component (B) is 1 / 20 to 3 / 2.

Description

Paste-like body cleanser composition

[0001] The present invention relates to a paste-like body cleanser composition.

[0002] Among body cleanser compositions, particularly for use on the face, consumers prefer paste- or cream-like (hereinafter simply referred to as "paste") body cleanser compositions, which do not drip and can be packaged in a tube or the like to dispense only the required amount at the time of use, instead of liquid cleansers, which tend to drip, or solid cleansers, which tend to dissolve and break down. Fatty acid salts are commonly used as surfactants in such paste-like body cleanser compositions. However, fatty acid salts have problems such as excessive degreasing during cleansing, leaving the skin feeling tight and lacking in moisturizing feeling after use. To solve these problems, compositions containing oils have been developed and proposed. The inclusion of these oils can impart a moisturizing feeling and smoothness after cleansing.

[0003] For example, Patent Document 1 discloses a cleanser composition that combines an anionic surfactant, an amphoteric surfactant, and a specific oil, and describes that the cleanser composition provides a moist feeling to hair after washing and rinsing with the cleanser composition. However, the cleanser composition described in Patent Document 1 sometimes causes stickiness when applied to the skin.

[0004] In contrast, Patent Document 2 discloses an aqueous liquid detergent composition that combines a higher fatty acid salt and / or a betaine-type amphoteric surfactant, a polyoxyethylene glyceryl fatty acid ester or a polyoxyethylene sorbit fatty acid ester, diethylene glycol laurate, and a specific ester oil, and describes that this detergent composition provides a moisturizing feeling after cleansing and also provides excellent non-stickiness after cleansing. However, the detergent composition described in Patent Document 2 sometimes exhibits poor rapid-foaming properties.

[0005] As a means for solving this problem, Patent Document 3 discloses a cleanser composition containing an anionic surfactant and hydrogenated polyisobutene having a number-average molecular weight of 1,000 to 3,000, and describes that this cleanser composition not only improves the feel after use but also improves rapid foaming, has good foam retention, and is excellent in foam persistence. However, although the cleanser composition described in Patent Document 3 has high foam persistence, it sometimes does not provide a feeling of gently enveloping the skin. This is because the foam produced by the composition is thick and hard, and when used as a cleanser, the foam gives a sense of resistance or repulsion.

[0006] Therefore, there is a demand for a paste-like body cleanser composition that provides a moist feeling and non-sticky feeling after cleansing, and that can produce abundant, long-lasting foam even when lathered in a short time, and that can produce a soft-feeling foam that gently envelops the skin.

[0007] JP 2006-28278 A JP 2011-132221 A JP 2018-070530 A

[0008] In view of the above problems, the present invention aims to provide a paste-like body cleanser composition that has excellent quick-foaming properties, can produce foam with a soft feel and long-lasting properties, and provides an excellent skin feel, such as no sticky feeling after washing and a moist feeling.

[0009] As a result of intensive research to solve the above problems, the present inventors have found that the above problems can be solved by combining specific isoparaffins, fatty acid salts, polyhydric alcohols, and water in specific mass ratios, and have thus completed the present invention.

[0010] That is, the present invention provides the following paste-like body cleanser composition: Component (A) 0.1 to 6 mass% of isoparaffin having an average carbon number of 50 to 250, Component (B) 0.2 to 14 mass% of isoparaffin having an average carbon number of 20 to 24, Component (C) 10 to 50 mass% of a fatty acid salt having 8 to 22 carbon atoms, Component (D) 5 to 30 mass% of a polyhydric alcohol having 2 to 4 carbon atoms and a valence of 2 to 3, and water, wherein the mass ratio of Component (A) to Component (B) ((A) / (B)) is 1 / 20 to 3 / 2.

[0011] The paste-like body cleanser composition of the present invention (hereinafter also referred to simply as "cleaner composition") has excellent quick-foaming properties, can produce soft, long-lasting foam, and provides an excellent skin feel that is not sticky after cleansing and leaves the skin feeling moisturized. In this specification, "paste-like" refers to a state intermediate between solid and liquid, and refers to an amorphous, fluid state, and includes, for example, cream-like, pasty, wax-like, and semi-paste-like forms. "Body" refers to the body surface of the head, neck, torso, arms, and legs, including the face. "Washing" refers to rinsing the foamed cleanser composition with water or an aqueous solution to remove it from the area to be cleaned.

[0012] Hereinafter, embodiments of the present invention will be described. However, the present invention is not limited to the embodiments described herein and various modifications can be made without departing from the spirit and scope of the present invention. In this specification, numerical ranges defined using the symbol "to" include both the upper and lower limits of the symbol "to." For example, "2 to 5" means 2 or more and 5 or less. Furthermore, in the numerical ranges described in this specification, the upper or lower limit of the range can be replaced with a value shown in the examples or a value uniquely derived from the examples. Furthermore, each upper or lower limit described in stages in this specification can be the upper or lower limit of any combined numerical range. For example, if the content of a certain component is described as "a lower limit of 5% by mass, preferably 10% by mass" and "a lower limit of 20% by mass, preferably 15% by mass," these can constitute the respective numerical ranges of "5 to 20% by mass," "5 to 15% by mass," "10 to 20% by mass," "10 to 15% by mass," "5 to 10% by mass," and "15 to 20% by mass."

[0013] <Paste-like body cleanser composition> The paste-like body cleanser composition of the present invention contains at least component (A), component (B), component (C), component (D), and water. Each component will be described below.

[0014] [Component (A)] Component (A) used in the present invention is an isoparaffin having an average carbon number of 50 to 250. This isoparaffin is a mixture of long-chain hydrocarbons having side chains, and is usually obtained by hydrogenating a polymer of isobutene and n-butene. Examples of such components include those generally classified as "heavy liquid isoparaffins" in the cosmetics field.

[0015] The upper limit of the average carbon number of isoparaffin is 250, preferably 230, more preferably 210, and particularly preferably 190, and the lower limit is 50, preferably 60, more preferably 70, and particularly preferably 80. Examples of the range of the average carbon number of isoparaffin include 50 to 250, 60 to 230, 70 to 210, and 80 to 190. If the average carbon number is too small, the foam durability and moist feeling after rinsing may be inferior. On the other hand, if the average carbon number is too large, the foam softness and lack of stickiness after rinsing may be inferior.

[0016] The average carbon number in this specification is a value derived from the results of peak area and mass analysis measured using a GC-MS (gas chromatography mass spectrometry) measuring device (JMS-T2000GC AccuTOF (registered trademark) GC-Alpha, manufactured by JEOL Ltd.).

[0017] Specific examples of products of component (A) include "Pearlream 18" (average carbon number 72), "Pearlream 24" (average carbon number 96), and "Pearlream 46" (average carbon number 184) (all manufactured by NOF Corporation). One or more of these isoparaffins with different average carbon numbers can be used as component (A).

[0018] [Component (B)] Component (B) used in the present invention is an isoparaffin having an average carbon number of 20 to 24, in other words, a mixture of medium-chain hydrocarbons having side chains, and is usually obtained by hydrogenating a polymer of isobutene and n-butene. Examples of such components include those generally classified as "liquid isoparaffins" in the cosmetics field.

[0019] If the average carbon number is less than 20, the viscosity of the paste may decrease, causing dripping and resulting in poor rapid foaming. On the other hand, if the average carbon number is more than 24, the softness of the foam and the lack of stickiness after washing may be poor.

[0020] Specific examples of products of component (B) include "Pearleam 6" (average carbon number: 24) and "Pearleam EX" (average carbon number: 20) (both manufactured by NOF Corporation). One or more of these isoparaffins with different average carbon numbers can be used as component (B).

[0021] [Component (C)] Component (C) used in the present invention is a fatty acid salt, and the upper limit of the number of carbon atoms in the fatty acid salt is 22, preferably 20, and more preferably 18, and the lower limit is 8, preferably 10, and more preferably 12. Examples of the range of the number of carbon atoms in the fatty acid salt include 8 to 22, 10 to 20, and 12 to 18.

[0022] Examples of fatty acids that form fatty acid salts having 8 to 22 carbon atoms include caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, isopalmitic acid, stearic acid, isostearic acid, oleic acid, and behenic acid, and one or more of these can be used. Mixed fatty acids containing two or more of these fatty acids, such as coconut oil fatty acid, palm kernel oil fatty acid, and beef tallow fatty acid, can also be used. Preferred examples of fatty acids having 8 to 22 carbon atoms include lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, coconut oil fatty acid, and palm kernel oil fatty acid, and more preferably lauric acid, myristic acid, palmitic acid, and stearic acid. Examples of counter ions that form fatty acid salts include sodium, potassium, ammonium, monoethanolammonium, diethanolammonium, and triethanolammonium. Preferred are sodium, potassium, and triethanolammonium, and more preferably potassium.

[0023] Component (C) in the present invention may be a fatty acid that has been converted into an alkali salt in advance, or may be a fatty acid that has been converted into an alkali salt by adding an equivalent amount of an alkaline agent to the fatty acid during the production process.

[0024] [Component (D)] Component (D) used in the present invention is a polyhydric alcohol having 2 to 4 carbon atoms and a valence of 2 to 3. A valence of 2 to 3 means that one molecule contains 2 to 3 hydroxy groups. Examples of polyhydric alcohols having 2 to 4 carbon atoms and a valence of 2 to 3 include glycerin, 1,3-butylene glycol, and propylene glycol. Of these, glycerin and 1,3-butylene glycol are preferred. One or more selected from these polyhydric alcohols can be used as component (D).

[0025] [Water] The cleaning composition of the present invention contains water in addition to the above-mentioned components (A) to (D). Examples of water include purified water such as distilled water and ion-exchanged water, and tap water. Among these, purified water such as distilled water and ion-exchanged water is preferred.

[0026] [Content of Each Component] The upper limit of the content of component (A) in the cleanser composition is 6% by mass, preferably 4% by mass, and more preferably 2% by mass, and the lower limit is 0.1% by mass, preferably 0.4% by mass, and more preferably 0.7% by mass. Examples of the range of the content of component (A) include 0.1 to 6% by mass, 0.4 to 4% by mass, and 0.7 to 2% by mass. If the content of component (A) is too low, the rapid foaming property, foam persistence, and moist feeling after cleansing may be insufficient, whereas if the content is too high, the rapid foaming property, foam softness, foam persistence, and lack of stickiness after cleansing may be insufficient.

[0027] The upper limit of the content of component (B) in the cleanser composition is 14% by mass, preferably 10% by mass, and more preferably 6% by mass, and the lower limit is 0.2% by mass, preferably 0.5% by mass, and more preferably 0.8% by mass. Examples of the range of the content of component (B) include 0.2 to 14% by mass, 0.5 to 10% by mass, and 0.8 to 6% by mass. If the content of component (B) is too low, the rapid foaming property, foam softness, and moist feeling after cleansing may be insufficient. If the content of component (B) is too high, the rapid foaming property, foam persistence, and lack of stickiness after cleansing may be insufficient, and it may be difficult to prepare a stable composition.

[0028] The upper limit of the content of component (C) in the cleanser composition is 50% by mass, preferably 45% by mass, and more preferably 42% by mass, while the lower limit is 10% by mass, preferably 15% by mass, and more preferably 23% by mass. Examples of the range of the content of component (C) include 10 to 50% by mass, 15 to 45% by mass, and 23 to 42% by mass. If the content of component (C) is too low, the foaming speed, foam persistence, and lack of stickiness after rinsing may be insufficient. If the content of component (C) is too high, the foam softness and moisturized feeling after rinsing may be insufficient. The contents of the fatty acid salts with different carbon numbers are not particularly specified, but the balance of their contents affects properties such as paste stability. For example, laurates with short carbon numbers provide good foaming but are irritating and reduce paste stability. In contrast, stearates with long carbon numbers improve paste stability but harden the formulation, which may fall outside the range suitable for use. Therefore, it is necessary to adjust the content of the fatty acid salt used depending on the purpose.

[0029] The upper limit of the content of component (D) in the cleanser composition is 30% by mass, preferably 28% by mass, and more preferably 25% by mass, and the lower limit is 5% by mass, preferably 7% by mass, and more preferably 10% by mass. Examples of the range of the content of component (D) include 5 to 30% by mass, 7 to 28% by mass, and 10 to 25% by mass. If the content of component (D) is too low, the foam persistence and moist feeling after cleansing may be insufficient, whereas if the content is too high, the rapid foaming ability, foam softness, and lack of stickiness after cleansing may be insufficient.

[0030] The upper limit of the total content of components (A) to (D) in the detergent composition is 90 mass%, preferably 80 mass%, more preferably 75 mass%, and the lower limit is 20 mass%, preferably 25 mass%, more preferably 30 mass%. The range of the total content is, for example, 20 to 90 mass%, 25 to 80 mass%, or 30 to 75 mass%.

[0031] The water content is not particularly limited as long as the detergent composition is in a paste state, but the upper limit of the water content in the detergent composition is, for example, 80 mass%, preferably 75 mass%, and more preferably 70 mass%, and the lower limit of the water content in the detergent composition is 10 mass%, preferably 20 mass%, and more preferably 25 mass%. Examples of the water content range include 10 to 80 mass%, 20 to 75 mass%, and 25 to 70 mass%.

[0032] The content of each component is the content when the total content of all components constituting the detergent composition is taken as 100% by mass. When a composition contains multiple substances corresponding to each component, the content of each component in the composition refers to the total content of the multiple substances present in the composition. The content of each component can be adjusted to the desired level by appropriately adjusting the amount of water added.

[0033] In the present invention, the upper limit of the mass ratio ((A) / (B)) of component (A) to component (B) is 3 / 2, preferably 5 / 4, and more preferably 1 / 1, and the lower limit is 1 / 20, preferably 3 / 20, and more preferably 1 / 4. Examples of the range of the mass ratio ((A) / (B)) include 1 / 20 to 3 / 2, 3 / 20 to 5 / 4, and 1 / 4 to 1 / 1. If the mass ratio ((A) / (B)) is too small, the rapid foaming ability, foam persistence, and moist feeling after rinsing may be insufficient, whereas if it is too large, the rapid foaming ability, foam softness, and lack of stickiness after rinsing may be insufficient.

[0034] [Other Components] The cleansing composition of the present invention may contain other optional components within the scope of not impairing the effects of the present invention. Examples of other components include oils and fats such as vegetable oils and animal oils; hydrocarbon oils other than component (A) and component (B), such as squalane and liquid paraffin; higher alcohols such as cetyl alcohol, stearyl alcohol, and cetostearyl alcohol; silicones such as cyclic silicone, dimethylpolysiloxane, and amino-modified polysiloxane; ester oils such as 2-ethylhexyl palmitate, tri(caprylic / capric)glyceryl, isopropyl myristate, and ethylene glycol distearate; cationic surfactants such as stearyltrimethylammonium chloride, benzalkonium chloride, and cocoyl arginine ethyl PCA; and polyoxyethylene lauryl ether sulfate. and anionic surfactants such as sodium N-cocoate methyl taurate; amphoteric surfactants such as lauryl betaine and coconut oil fatty acid acylpropyl betaine; nonionic surfactants such as polyoxyethylene alkyl ethers, polyglycerol fatty acid esters, and polyoxyethylene glycerol fatty acid esters; water-soluble polymers such as hydroxyethyl cellulose, cationized cellulose, polyethylene glycol, polyvinyl alcohol, and carboxyvinyl polymers; solvents such as ethanol; pH adjusters such as citrates, succinates, malates, and tartrates; antioxidants such as tocopherol; polysaccharides, amino acids, peptides, preservatives, fragrances, and coloring agents may be appropriately contained.

[0035] The content of the other components in the cleanser composition of the present invention can be set according to the purpose and based on the amount typically used in cosmetics, etc., but the upper limit in the composition is 20% by mass, preferably 15% by mass, and more preferably 10% by mass, and the lower limit is 0% by mass, preferably 0.1% by mass, and more preferably 0.5% by mass. The content of the other components can be, for example, 20% by mass or less, 0.1 to 15% by mass, or 0.5 to 10% by mass. Among the other components, ethylene glycol distearate is preferably contained, and when the cleanser composition of the present invention contains ethylene glycol distearate, its content is preferably 1 to 5% by mass. The inclusion of this component can further improve foam persistence and moisturized feeling after cleansing without impairing the quick-foaming property, foam softness, and non-stickiness after cleansing.

[0036] The pH of the cleaning composition of the present invention at 25°C is not particularly limited, but the upper limit is preferably 10.5, and the lower limit is preferably 8.5, more preferably 9.0, and particularly preferably 9.5. Examples of the pH at 25°C include 8.5 to 10.5, 9.0 to 10.5, and 9.5 to 10.5. The above pH is measured after diluting the cleaning composition 10 times (by mass) with purified water.

[0037] [Production of Detergent Composition] The detergent composition of the present invention can be produced by a known method, for example, by adding the above-mentioned components to water, mixing them with stirring at 75 to 85°C, and gradually cooling the mixture to 10 to 30°C with stirring.

[0038] EXAMPLES The present invention will be specifically explained below with reference to examples and comparative examples, but the present invention is not limited to these examples in any way.

[0039] Examples 1 to 12 and Comparative Examples 1 to 7 Preparation of Cleanser Compositions Components (A) to (D) and other components in Tables 1 and 2 were added sequentially to water, mixed with stirring at 80°C, and then gradually cooled to 25°C with stirring to prepare the cleanser compositions of Examples 1 to 12 and Comparative Examples 1 to 7. Commercially available cosmetic products were used as the components in Tables 1 and 2. The trade names of A1 to A3, B1 to B2, C1 to C4, and D1 to D2 in Tables 1 and 2 are shown below. The content of each component in Tables 1 and 2 is shown in mass%. A1: "Pearlream 24" (NOF Corporation): Hydrogenated polyisobutene with an average carbon number of 96 A2: "Pearlream 46" (NOF Corporation): Hydrogenated polyisobutene with an average carbon number of 184 A3: "Pearlream 18" (NOF Corporation): Hydrogenated polyisobutene with an average carbon number of 72 B1: "Pearlream 6" (NOF Corporation): Hydrogenated polyisobutene with an average carbon number of 24 B2: "Pearlream EX" (NOF Corporation): Hydrogenated polyisobutene with an average carbon number of 20 C1: "NonSal LK-2" (NOF Corporation): Potassium laurate C2: "NonSal MK-1" (NOF Corporation): Potassium myristate C3: "NonSal PK-1" (NOF Corporation): Potassium palmitate C4: "Potassium stearate" (Kanto Chemical Co., Ltd.): Potassium stearate D1: "RG-S" (NOF Corporation): Glycerin D2: "1,3-butylene glycol-P" (KH Neochem Co., Ltd.): 1,3-butylene glycol Other ingredients: "Unistar E-286" (NOF Corporation): ethylene glycol distearate

[0040] <Evaluation of Cleaning Compositions> Each of the cleaning compositions of Examples 1 to 12 and Comparative Examples 1 to 7 was evaluated for quick foaming, foam softness, foam persistence, non-stickiness, and moisturizing feel, as described in (1) to (5) below. The evaluation results are shown in Tables 1 and 2. The panelists conducting the following evaluations were trained in a preliminary evaluation test conducted prior to the evaluation test so that the level of evaluation corresponding to each score would be roughly consistent, and differences in evaluation criteria between panelists were avoided.

[0041] (1) Rapid Foaming Ability 1.0 g of each of the detergent compositions of the Examples and Comparative Examples was taken, and water heated to 40°C was added thereto so that the total amount became 50 g. Without pre-dilution, the composition was foamed for 5 seconds using a blender ("IFM-100" manufactured by Iwatani Corporation, the same applies hereinafter) and allowed to stand for 1 minute. The height of the foam in the blender container was then measured. Based on the measured foam height, the foam volume of the detergent composition was evaluated into four levels: "◎", "◯", "△", and "×" according to the following evaluation criteria. A rating of "◎" and a rating of "◯" were deemed to be acceptable.

[0042] <Evaluation criteria> ◎: Foam height is 60 mm or more ○: Foam height is 50 mm or more and less than 60 mm △: Foam height is 40 mm or more and less than 50 mm ×: Foam height is less than 40 mm

[0043] (2) Foam Softness 1.0 g of each of the cleanser compositions of the Examples and Comparative Examples was taken, and water heated to 40°C was added thereto so that the total amount became 50 g. The composition was then whipped using a blender for 5 seconds and allowed to stand for 1 minute. 0.5 g of the foam in the blender container was then taken, and the storage modulus was measured at 20°C using a rheometer ("MCR302" manufactured by Anton Paar Japan K.K.). Based on the measured storage modulus, the foam softness of the cleanser composition was evaluated on a four-point scale of "◎", "◯", "△", and "×" according to the following evaluation criteria. A rating of "◎" and a rating of "◯" were deemed to be acceptable.

[0044] <Evaluation criteria> ⊚: The storage modulus of the foam is 750 mPa or more and less than 1,100 mPa; ○: The storage modulus of the foam is 1,100 mPa or more and less than 1,250 mPa; △: The storage modulus of the foam is 1,250 mPa or more and less than 1,400 mPa; ×: The storage modulus of the foam is 1,400 mPa or more

[0045] (3) Foam Durability 1.0 g of each of the detergent compositions of the Examples and Comparative Examples was taken, and water heated to 40°C was added thereto so that the total amount became 50 g. The composition was then foamed for 5 seconds using a blender and allowed to stand for 1 minute. 1.0 g of the foam in the blender container was then placed on a plate, which was then turned upside down, and the time until one drop of foam was drained was measured. Based on the measured drainage time, the foam durability of the detergent composition was evaluated on a four-point scale of "◎", "◯", "△", and "×" according to the following evaluation criteria. A rating of "◎" and a rating of "◯" were deemed to be acceptable.

[0046] <Evaluation criteria> ◎: The foam drainage time was 80 seconds or more. ○: The foam drainage time was 60 seconds or more but less than 80 seconds. △: The foam drainage time was 40 seconds or more but less than 60 seconds. ×: The foam drainage time was less than 40 seconds.

[0047] (4) Skin feel after cleansing (non-stickiness) A usability test was conducted by 20 panelists. Each panelist washed their face with 1.0 g of each cleanser composition of the Examples and Comparative Examples, and evaluated the non-stickiness after cleansing according to the absolute evaluation criteria below. The total score of each panelist was calculated, and based on the total score, the skin was evaluated on a four-point scale of "◎", "◯", "△", and "×" according to the evaluation criteria below. A score of "◎" and a score of "◯" were deemed to be acceptable.

[0048] <Absolute evaluation criteria> (Score): (Evaluation) 3: No sticky feeling. 2: Slightly sticky feeling. 1: Sticky feeling. 0: Very sticky feeling. <4-level evaluation based on the total score> ◎: Total score is 50-60 points ○: Total score is 40-49 points △: Total score is 30-39 points ×: Total score is less than 30 points

[0049] (5) Skin feel after cleansing (moist feeling) A usability test was conducted by 20 panelists. Each panelist washed their face with 1.0 g of each cleanser composition of the Examples and Comparative Examples, and evaluated the moist feeling after cleansing according to the absolute evaluation criteria below. The total score of each panelist was calculated, and based on the total score, the results were evaluated into four levels of "◎", "◯", "△", and "×" according to the evaluation criteria below. A score of "◎" and a score of "◯" were considered to be acceptable.

[0050] <Absolute evaluation criteria> (Score): (Evaluation) 3: A moist feeling can be felt. 2: A slightly moist feeling can be felt. 1: Not very moist feeling. 0: Not moist feeling, feels dry. <4-level evaluation based on the sum of the scores> ◎: A sum of the scores is 50-60 points ○: A sum of the scores is 40-49 points △: A sum of the scores is 30-39 points ×: A sum of the scores is less than 30 points

[0051]

[0052]

[0053] All of the cleanser compositions of Examples 1 to 12 were excellent in terms of quick foaming, foam softness, foam persistence, non-stickiness after washing, and moist feeling.

[0054] On the other hand, Comparative Example 1 did not contain component (A), and therefore was inferior in quick-foaming ability and foam durability, and the moist feeling after rinsing was also insufficient. Comparative Example 2 contained too much component (A), and therefore was inferior in quick-foaming ability, foam softness, and foam durability, and the lack of stickiness after rinsing was also insufficient. Comparative Example 3 did not contain component (B), and therefore was inferior in quick-foaming ability and foam softness, and the moist feeling after rinsing was also insufficient. Comparative Example 4 contained too much component (B), and therefore was insufficient in quick-foaming ability, foam durability, and the lack of stickiness after rinsing. Comparative Example 5 did not contain component (D), and therefore was insufficient in foam durability and moist feeling after rinsing. Comparative Example 6 had a too small mass ratio ((A) / (B)), and therefore was inferior in quick-foaming ability and foam durability, and the moist feeling after rinsing was also insufficient. In Comparative Example 7, the mass ratio ((A) / (B)) was too large, and therefore the foaming speed and foam softness were poor, and the lack of stickiness after washing was also insufficient.

[0055] Furthermore, a specific formulation example of the paste-like body cleanser composition of the present invention is shown below. The paste-like body cleanser composition of this formulation example was also evaluated according to the above (1) to (5), and was found to be excellent in terms of quick foaming, foam softness, foam persistence, non-stickiness after cleansing, and moisturizing feeling. The mass ratio ((A) / (B)) in the following formulation example is 3 / 7.

[0056] [Formulation example: Facial cleansing paste] (Ingredients) (% by mass) 1. Potassium myristate (C2) 26.6 2. Potassium stearate (C4) 8.3 3. 1,3-butylene glycol (D2) 8.0 4. Glycerin (D1) 5.0 5. Potassium palmitate (C3) 3.2 6. Potassium laurate (C1) 2.5 7. Ethylene glycol distearate 2.5 8. Hydrogenated polyisobutene having an average carbon number of 24 (B1) 2.1 9. Sodium laurylaminodiacetate 1.8 10. Sorbitan monostearate 1.0 11. Lauric acid diethanolamide 1.0 12. Hydrogenated polyisobutene having an average carbon number of 96 (A1) 0.9 13. Purified water Balance Total 100.0

[0057] The paste-like body cleanser composition of the present invention has excellent quick-foaming properties, can produce soft, long-lasting foam, and provides an excellent skin feel that is not sticky after washing and leaves the skin feeling moisturized, making it suitable for use in, for example, body shampoos, facial cleansers, hand soaps, etc.

Claims

1. A paste-like body cleanser composition comprising: component (A) 0.1 to 6 mass% of isoparaffin having an average carbon number of 50 to 250; component (B) 0.2 to 14 mass% of isoparaffin having an average carbon number of 20 to 24; component (C) 10 to 50 mass% of a fatty acid salt having 8 to 22 carbon atoms; component (D) 5 to 30 mass% of a polyhydric alcohol having 2 to 4 carbon atoms and a valence of 2 to 3; and water, wherein the mass ratio of component (A) to component (B) ((A) / (B)) is 1 / 20 to 3 / 2.

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