Foamable bath tablet

Abstract

The present invention provides a foamable bath tablet containing the following components (A)-(D): (A) 30-50 wt% (inclusive) of (A1) sodium bicarbonate and / or (A2) sodium carbonate; (B) 25-45 wt% (inclusive) of an organic acid; (C) polyethylene glycol having a molecular weight of 1000 or more; 0.1 wt% or more of (D) one or more liquid oily components selected from the group consisting of isopropyl myristate, isopropyl palmitate, and dimethyl polysiloxane, and the weight ratio of the total content of component (C) and component (D) to the total content of component (A) and component (B), [(C) + (D)] / [(A) + (B)], is 0.14 or more. The total content of the liquid components is 0.15% by weight or more and 1.05% by weight or less.

Description

Technical Field

[0001] This invention relates to a foaming bath tablet. Background Technology

[0002] Bath products containing carbonates and organic acids are popular because they generate carbon dioxide bubbles in bath water, which can promote blood circulation and enhance user enjoyment.

[0003] Known bath additives include: bath additive compositions incorporating carbonates, organic acids, water-soluble polymers, and nonionic surfactants (Patent Document 1); bath additives incorporating carbonates, organic acids, and oily components (Patent Document 2); and granular foaming bath additives incorporating carbonates, organic acids, water-soluble binders, and oily components (Patent Document 3). However, these bath additives are unsatisfactory in terms of the duration of carbon dioxide bubbles (foaming time) and the concentration of carbon dioxide bubbles during use.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2005-97238A

[0007] Patent Document 2: Japanese Patent Application Publication No. 2009-161439A

[0008] Patent Document 3: Japanese Patent Application Publication No. 2011-16749A Summary of the Invention

[0009] To address the issues of carbon dioxide bubble foaming time and concentration in the aforementioned bath products, the inventors conducted specialized research. The results showed that by combining sodium carbonate and / or sodium bicarbonate as foaming components, organic acids with polyethylene glycol as a polymer, and specific oily components in specific amounts, the resulting foaming bath tablets can effectively prolong the carbon dioxide bubble foaming time during use, continuously release carbon dioxide bubbles, maintain the carbon dioxide concentration in the water, and enhance user enjoyment.

[0010] Therefore, the object of the present invention is to provide a foaming bath tablet containing the following components (A) to (D):

[0011] (A)(A1) Sodium bicarbonate and / or (A2) Sodium carbonate, 30% to 50% by weight;

[0012] (B) Organic acids, 25% to 45% by weight;

[0013] (C) Polyethylene glycol with a molecular weight of 1000 or higher;

[0014] (D) A liquid oily component selected from isopropyl myristate, isopropyl palmitate, and dimethyl polysiloxane, at least 0.1% by weight.

[0015] Furthermore, the weight ratio of the total content of components (C) and (D) to the total content of components (A) and (B), [(C)+(D)] / [(A)+(B)], is 0.14 or higher.

[0016] In the foaming bath tablets, the total content of the liquid components is more than 0.15% by weight and less than 1.05% by weight.

[0017] The foaming bath tablets of the present invention can fully dissolve without residue during use, release carbon dioxide bubbles, effectively prolong the foaming time, and the resulting bath liquid is clear and non-greasy, allowing users to relax and de-stress, and effectively improving users' enjoyment. Detailed Implementation

[0018] The foaming bath tablet of the present invention contains: (A) sodium bicarbonate and / or (A2) sodium carbonate; (B) organic acid; (C) polyethylene glycol with a molecular weight of 1000 or more; and (D) one or more liquid oily components selected from isopropyl myristate, isopropyl palmitate and dimethyl polysiloxane, wherein components (A) and (B) are the alkali source and acid source of the foaming component, respectively, component (C) is a binder, and component (D) is an adhesive aid. In use, the foaming bath tablet of the present invention is added to water, and components (A) and (B) react in the water to generate carbon dioxide bubbles.

[0019] The following provides a detailed description of each component contained in the foaming bath tablets of the present invention.

[0020] [Ingredients (A)]

[0021] The component (A) of this invention is sodium bicarbonate (A1) and / or sodium carbonate (A2). From the viewpoint of carbon dioxide bubble concentration and prolonged foaming time, sodium bicarbonate (A1) and sodium carbonate (A2) are preferred. Component (A) serves as the alkali source for the foaming component in the foaming bath tablet of this invention. During use of the foaming bath tablet, it reacts with water and the following component (B) to generate carbon dioxide bubbles.

[0022] In the foaming bath tablets of the present invention, the content of component (A) is 30% by weight or more, preferably 35% by weight or more, more preferably 40% by weight or more, and 50% by weight or less, preferably 48% by weight or less, from the viewpoint of carbon dioxide bubble concentration and long-term foaming.

[0023] [Ingredient (B)]

[0024] Component (B) is an organic acid. Examples of organic acids that can be used as component (B) include succinic acid, fumaric acid, malic acid, adipic acid, tartaric acid, benzoic acid, citric acid, pyrrolidone carboxylic acid, salicylic acid, maleic acid, phthalic acid, glutaric acid, and oxalic acid. From a stability perspective, succinic acid, fumaric acid, malic acid, adipic acid, tartaric acid, and citric acid are preferred. These organic acids can be used alone or in combination of two or more.

[0025] In the foaming bath tablets of the present invention, component (B) serves as an acid source for the foaming component. During the use of the foaming bath tablets, it reacts with water and the above-mentioned component (A) to generate carbon dioxide bubbles.

[0026] In the foaming bath tablets of the present invention, the content of component (B) is 25% by weight or more, preferably 30% by weight or more, more preferably 35% by weight or more, and 45% by weight or less, preferably 41% by weight or less, from the viewpoint of carbon dioxide bubble concentration and long-term foaming.

[0027] [Ingredient (C)]

[0028] Component (C) is polyethylene glycol with a molecular weight of 1000 or more. From the viewpoint of carbon dioxide bubble concentration and long-term foaming, it is preferably selected from one or more of polyethylene glycol 4000 with a molecular weight of 3000 to 3700 and polyethylene glycol 6000 with a molecular weight of 6000 to 7500. These polyethylene glycols can be used alone or in combination of two or more.

[0029] Component (C) of this invention, being a high molecular weight polymer, can be either semi-solid or solid depending on its molecular weight. Furthermore, as the molecular weight of polyethylene glycol increases, its viscosity increases accordingly, thus improving the stability of the resulting tablet. In the foaming bath tablet of this invention, component (C) functions as a binder, adhering to the powders of components (A) and (B) that serve as foaming components; that is, it embeds the powders of components (A) or (B) therein. During the use of the foaming bath tablet of this invention, component (C) prevents water from penetrating between components (A) and (B), thereby prolonging the foaming time.

[0030] In the foaming bath tablets of the present invention, the content of component (C) is 10% by weight or more, preferably 12% by weight or more, and 41% by weight or less, preferably 35% by weight or less, from the viewpoint of carbon dioxide bubble concentration and long-term foaming.

[0031] [Ingredient (D)]

[0032] Component (D) is a liquid oily component selected from isopropyl myristate, isopropyl palmitate, and dimethyl polysiloxane. From the viewpoint of carbon dioxide bubble concentration and long-term foaming time, isopropyl myristate is preferred. These liquid oily components can be used alone or in combination of two or more.

[0033] In the foaming bath tablets of the present invention, component (D) functions as a wetting agent. When used in conjunction with component (C), it wets component (C) and induces its own adhesiveness, further enhancing the adhesive force between component (A) and component (B) as foaming components. Furthermore, component (D) is hydrophobic, further hindering the contact between water and foaming components during the use of the foaming bath tablets of the present invention.

[0034] In the foaming bath tablets of the present invention, the content of component (D), from the viewpoint of carbon dioxide bubble concentration and long-term foaming, is 0.1% by weight or more, preferably 0.15% by weight or more, more preferably 0.16% by weight or more, more preferably 0.18% by weight or more, even more preferably 0.2% by weight or more, and is 1.05% by weight or less, preferably 1.03% by weight or less, more preferably 0.6% by weight or less, and even more preferably 0.52% by weight or less.

[0035] The combined use of components (C) and (D) can further enhance the adhesion effect and prolong the foaming time; however, if the content of components (C) and (D) is too high, the foaming efficiency will decrease. This will reduce the foaming and massage sensation provided to the user, and will also lead to a decrease in the concentration of carbon dioxide bubbles in the water. Therefore, in order to balance the persistence and efficiency of foaming, it is necessary to control the proportion of components (C) and (D) in the composition within a certain range. As the weight ratio of the total content of components (C) and (D) to the total content of components (A) and (B), [(C)+(D)] / [(A)+(B)] is 0.14 or more, preferably 0.16 or more, more preferably 0.21 or more, and 0.69 or less, preferably 0.52 or less. If the above ratio is less than 0.14, sufficient foaming time cannot be ensured.

[0036] [Other ingredients]

[0037] In addition, the foaming bath tablets of the present invention may contain, in addition to the above-mentioned ingredients, appropriate amounts of ingredients commonly used in bath tablets, such as functional ingredients, plant extracts, colorants, fragrances, etc., without affecting the effect of the present invention.

[0038] The foaming bath tablets of the present invention can be manufactured by appropriately mixing the above-mentioned components and then directly compressing or granulating them into tablets. During the tableting process, pressure is a crucial factor affecting tablet formation and quality; therefore, in laboratory tableting, the pressure needs to be controlled below 70 kN, and in factory tableting, the pressure is controlled between 100 and 500 kN. The resulting foaming bath tablets weigh between 20 and 60 g, preferably 40 to 50 g, and most preferably around 45 g.

[0039] Furthermore, the total amount of liquid component in the foaming bath tablets of the present invention also affects the foaming time. When the liquid component content is controlled to be 0.15% by weight or more and 1.05% by weight or less, and even more specifically 0.52% by weight or less, the foaming time can be effectively extended. If the liquid component content is higher than 1.05% by weight or lower than 0.15% by weight, the foaming time will be shortened, and a satisfactory effect cannot be achieved. The reason for this is speculated to be as follows: the liquid component in the tablet can induce the viscosity of the solid powder component itself. When the liquid component content is too high or too low, the resulting foaming bath tablet structure will be more easily dispersed and dissolved by water, resulting in a very short foaming time.

[0040] [Foot bath solution or shower gel]

[0041] The foaming bath tablets of the present invention can be used, but are not limited to, as foot bath agents or bath products to promote relaxation and soothe emotions in users.

[0042] When used as a foot bath agent, the foaming bath tablets of the present invention can be added to water and used to soak the feet.

[0043] When used as a bathing agent, the foaming bath tablets of the present invention can be added to water and used to rinse the whole body or a part of the body; or, the foaming bath tablets of the present invention can be added to water and used to soak the whole body or a part of the body.

[0044] Among them, it is preferred for use as a foot bath agent, as it can more effectively promote blood circulation and improve sleep quality.

[0045] [Carbon dioxide bubble concentration]

[0046] From the user's sensory perspective, when using the foaming bath tablets of the present invention as a foot bath agent for foot baths, or as a bath agent for whole-body or local body immersion, the carbonic acid concentration in the water is 500 ppm or more, preferably 800 ppm or more, and more preferably 1000 ppm or more.

[0047] When using the foaming bath tablets of the present invention as a bathing agent for a full-body or partial shower, the water flow rate increases and the shower time needs to be maintained. From the comprehensive viewpoint of actual water flow rate and user experience, the carbonic acid concentration in the water sprayed from the shower head should be 100 ppm or more, preferably 200 ppm or more.

[0048] [Embodiments of the Invention]

[0049] The following are examples of embodiments of the present invention.

[0050] <1> A foaming bath tablet, wherein the foaming bath tablet contains the following components (A) to (D):

[0051] (A)(A1) Sodium bicarbonate and / or (A2) Sodium carbonate, 30% to 50% by weight;

[0052] (B) Organic acids, 25% to 45% by weight;

[0053] (C) Polyethylene glycol with a molecular weight of 1000 or higher;

[0054] (D) A liquid oily component selected from isopropyl myristate, isopropyl palmitate, and dimethyl polysiloxane, at least 0.1% by weight.

[0055] Furthermore, the weight ratio of the total content of components (C) and (D) to the total content of components (A) and (B), [(C)+(D)] / [(A)+(B)], is 0.14 or higher.

[0056] In the foaming bath tablets, the total content of the liquid components is more than 0.15% by weight and less than 1.05% by weight.

[0057] <2> The above <1> The foaming bath tablets mentioned above, wherein component (A) is sodium bicarbonate (A1) and sodium carbonate (A2).

[0058] <3> The above <1> or <2> The foaming bath tablets described herein, wherein the content of component (A) is preferably 35% by weight or more, more preferably 40% by weight or more, and preferably 48% by weight or less.

[0059] <4> The above <1> ~ <3> The effervescent bath tablet according to any one of the following, wherein the organic acid of component (B) is selected from one or more of succinic acid, fumaric acid, malic acid, adipic acid, tartaric acid, benzoic acid, citric acid, pyrrolidone carboxylic acid, salicylic acid, maleic acid, phthalic acid, glutaric acid and oxalic acid, preferably selected from one or more of succinic acid, fumaric acid, malic acid, adipic acid, tartaric acid and citric acid.

[0060] <5> The above <1> ~ <4> In any one of the foaming bath tablets, the content of component (B) is preferably 30% by weight or more, more preferably 35% by weight or more, and preferably 41% by weight or less.

[0061] <6> The above <1> ~ <5> The foaming bath tablets according to any one of the following methods, wherein component (C) is one or more selected from polyethylene glycol 4000 with a molecular weight of 3000 to 3700 and polyethylene glycol 6000 with a molecular weight of 6000 to 7500.

[0062] <7> The above <1> ~ <6> The foaming bath tablets according to any one of the following methods, wherein the content of component (C) is 10% by weight or more, preferably 12% by weight or more, and 41% by weight or less, preferably 35% by weight or less.

[0063] <8> The above <1> ~ <7> The effervescent bath tablet according to any one of the following, wherein component (D) is isopropyl myristate.

[0064] <9> The above <1> ~ <8> In any one of the foaming bath tablets, the content of component (D) is preferably 0.15% by weight or more, preferably 0.16% by weight or more, more preferably 0.18% by weight, further preferably 0.2% by weight or more, and is 1.05% by weight or less, preferably 1.03% by weight or less, more preferably 0.6% by weight or less, and further preferably 0.52% by weight or less.

[0065] <10> The above <1> ~ <9> In any one of the foaming bath tablets, the weight ratio of the total content of component (C) and component (D) to the total content of component (A) and component (B), [(C)+(D)] / [(A)+(B)] is preferably 0.16 or more, more preferably 0.21 or more, and 0.69 or less, preferably 0.52 or less.

[0066] <11> The above <1> ~ <10> Use of any one of the foaming bath tablets as a foot bath agent.

[0067] <12> The above <1> ~ <10> Use of any one of the foaming bath tablets as a bathing agent.

[0068] Example

[0069] The present invention is further described below with reference to examples and comparative examples, but the present invention is not limited to the examples described below. Additionally, the content of each component is by weight%.

[0070] Examples 1-13, Comparative Examples 1-10

[0071] 1. Preparation: Foaming bath tablets

[0072] Prepare the foaming bath tablets according to the compositions shown in Tables 1 - 3 as follows.

[0073] ① Mixing: Mix component (A1) and component (A2) evenly to form the mixed component (A); in addition, mix the components (C) and (D) shown in Tables 1 - 3 evenly, then add component (B), and further add component (A) and mix evenly.

[0074] ② Tabletting: Perform direct tabletting using a tabletting machine (RIKEN SEIKI), control the pressure during tabletting within 70 KN, and control the tablet weight to be about 45 g.

[0075] Thus, the foaming bath tablets of Examples 1 - 13 and Comparative Examples 1 - 10 are obtained. Use each of the obtained foaming bath tablets for the following evaluations.

[0076] 2. Evaluation: Foaming time and carbon dioxide concentration

[0077] Use a water bath with a water temperature of 42 °C and a water volume of 5 L, put in each foaming bath tablet, start timing from the beginning of foaming until foaming is completely finished, record the foaming time, and immediately use a carbon dioxide meter to directly measure the concentration of free dissolved carbon dioxide in the water bath at the end of complete foaming. If the foaming time is 300 seconds or more, it is judged as qualified, and if the carbon dioxide concentration in the water bath is 800 ppm or more, it is judged as qualified.

[0078] 3. Sensory evaluation

[0079] In an environment with a room temperature of 20 °C and a humidity of 40%, five members of a professional panel use a water bath with a hot water temperature of 42 °C and a water volume of 5 L, immerse their feet in the water bath, put in the foaming bath tablets of Examples 1 - 11 and Comparative Examples 1 - 3, and after soaking in the water bath for 20 minutes, dry their feet. For the sensory evaluation of foot bath, score according to the following criteria between 0 points and 5 points and then take the average value. Each item score of 3 points or more and a comprehensive score of 15 points or more are judged as qualified.

[0080] (1) Physical relaxation: "0 point: Not relaxed at all" - "5 points: Completely relaxed"

[0081] Physical relaxation refers to the degree of physical relaxation felt by the body. Specifically, it means the changes felt by the user's body caused by the product (such as changes in body temperature and blood circulation, relaxation of foot muscles), which can relieve muscle soreness and tightness, eliminate physical discomfort and congestion and stiffness, and the body muscles tend to be relaxed, thus feeling physically relaxed.

[0082] (2) Mental relaxation: "0 point: Not relaxed at all" - "5 points: Completely relaxed"

[0083] Mental relaxation refers to the degree to which one feels relaxed. Specifically, it means that the user's psychology is affected by the product's effects (such as the tactile sensation and visual effects of bubbles being released and bursting on the skin for a long time), thereby reducing anxiety or excitement and returning to a state of calm.

[0084] (3) Warmth sensation: "0 points: I didn't feel it at all" ~ "5 points: I felt a strong warmth"

[0085] The sensation of warmth refers to the degree of feeling of warmth, specifically the temperature change that the product makes the user's body feel.

[0086] (4) Bubble sensation: "0 points: I didn't feel it at all" ~ "5 points: I felt a very strong bubble sensation"

[0087] Bubble sensation refers to the consumer's perception of the intensity of bubbles in a solution. Specifically, it refers to the user's judgment of the intensity of bubbles: the visual perception of emerging bubbles and the abundance of bubbles felt on the skin.

[0088] (5) Massage sensation: "0 points: I didn't feel anything at all" ~ "5 points: I felt a very strong massage sensation"

[0089] Massage sensation refers to the degree of sensation felt during a massage, specifically the tactile sensation similar to a massage that sparkling water provides to the user's skin: the physical stimulation the skin receives (e.g., the bubbles are massaging).

[0090] The results are shown in Tables 1-3.

[0091] Table 1

[0092]

[0093] IPM: Isopropyl myristate, Manufacturer: Kao Corporation

[0094] Table 2

[0095]

[0096] IPM: Isopropyl myristate, Manufacturer: Kao Corporation

[0097] Table 3

[0098]

[0099] IPP: Isopropyl palmitate, Manufacturer: Kao Corporation

[0100] COSMOL 42V: Polyglycerol-2-diisostearate, Manufacturer: Kao Corporation

[0101] SILICONE KF-96A: Polydimethylsiloxane, Manufacturer: Kao Corporation

[0102] WILBRIDE S-753: Polybutanediol, Manufacturer: Kao Corporation

[0103] -: Cannot be calculated.

[0104] As can be seen from Tables 1 to 3, the foaming time of the foaming bath tablets according to the present invention is more than 300 seconds and the carbon dioxide concentration is more than 880 ppm. Therefore, it is fully verified that the obtained foaming bath tablets can effectively prolong the foaming time of carbon dioxide bubbles during use, continuously release carbon dioxide bubbles, maintain the concentration of carbon dioxide in the water, and improve the user's preference.

Claims

1. A foaming bath tablet, wherein, The foaming bath tablets contain the following ingredients (A) to (D): (A)(A1) Sodium bicarbonate and / or (A2) Sodium carbonate, 30% to 50% by weight; (B) Organic acids, 25% to 45% by weight; (C) Polyethylene glycol with a molecular weight of 1000 or higher; (D) A liquid oily component selected from isopropyl myristate, isopropyl palmitate, and dimethyl polysiloxane, at least 0.1% by weight. Furthermore, the weight ratio of the total content of components (C) and (D) to the total content of components (A) and (B), [(C)+(D)] / [(A)+(B)], is 0.14 or higher. In the foaming bath tablets, the total content of the liquid components is more than 0.15% by weight and less than 1.05% by weight.

2. The foaming bath tablet according to claim 1, wherein, As the weight ratio of the total content of components (C) and (D) to the total content of components (A) and (B), [(C)+(D)] / [(A)+(B)] is 0.69 or less.

3. The foaming bath tablet according to claim 1 or 2, wherein, Component (A) consists of sodium bicarbonate (A1) and sodium carbonate (A2).

4. The foaming bath tablet according to any one of claims 1 to 3, wherein, The organic acid in component (B) is selected from one or more of the following: succinic acid, fumaric acid, malic acid, adipic acid, tartaric acid, benzoic acid, citric acid, pyrrolidone carboxylic acid, salicylic acid, maleic acid, phthalic acid, glutaric acid, and oxalic acid.

5. The foaming bath tablet according to any one of claims 1 to 4, wherein, Component (C) is selected from one or more of polyethylene glycol 4000 with a molecular weight of 3000 to 3700 and polyethylene glycol 6000 with a molecular weight of 6000 to 7500.

6. The foaming bath tablet according to any one of claims 1 to 5, wherein, The content of component (C) is more than 10% by weight and less than 41% by weight.

7. The foaming bath tablet according to any one of claims 1 to 6, wherein, Ingredient (D) is isopropyl myristate.

8. The foaming bath tablet according to any one of claims 1 to 7, wherein, The content of component (D) is less than 0.6% by weight.

9. Use of the foaming bath tablets according to any one of claims 1 to 8 as a foot bath agent.

10. Use of the foaming bath tablets according to any one of claims 1 to 8 as a bathing agent.

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