Effervescent compressed molded tablet

Abstract

To provide an effervescent compressed molded tablet that ensures sufficient foaming time and sound when immersed in hot water (or water).SOLUTION: An effervescent compressed molded tablet contains an organic acid (A), a carbonate (B), and an oil solution (C) with a viscosity of 100 mPa s or less at 25°C. The component (A) includes 70 mass% or more of an organic acid (A1) with a solubility of 10 g or less in 100 mL of water at 20°C. In the tablet, the content of component (A) is 40 mass% or more and the content of component (B) is 38 mass% or more. The volume of the tablet is 7.5 cm3 or more. The mass of component (C) in the tablet is 2.0 mg / cm3 or more relative to the volume of the tablet. The hardness of the tablet is 20 kgf or more.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to effervescent compressed tablets. [Background technology]

[0002] It is known that solid bath additives containing organic acids and carbonates generate carbon dioxide bubbles in bath water, allowing the enjoyment of a fizzing sensation, while also providing a warming sensation and blood circulation-promoting effect due to the carbon dioxide. It is also being considered to further add medicinal ingredients to the fizzing solid bath additives to provide various functions, such as fatigue relief effects.

[0003] On the other hand, the functions required for bath additives have changed in recent years. Especially among young people, bath time is a precious time for relaxation in busy daily life, and bath time tends to be longer. Therefore, bath additives that can provide new added value by stimulating the five senses and providing a more effective rest while bathing are being studied.

[0004] The carbon dioxide gas effervescence of bath additives is one of the effective factors in stimulating the five senses. For example, the carbon dioxide gas effervescence during bathing can stimulate the senses of sight, hearing (the effervescence sound), touch (the feeling caused by the effervescence), and smell (the change in scent). In order to enjoy a long, comfortable bath with the carbon dioxide gas effervescence, bath additives that guarantee sufficient effervescence time and effervescence sound are desired. Furthermore, by allowing the bath additive to rise from the water to the surface as it dissolves and effervescence in the water and on the surface for a certain period of time or more, it becomes easier to sense the effervescence sound and change in scent while bathing, allowing you to enjoy a comfortable bath for a long time.

[0005] In order to obtain a sufficient effervescent time and effervescent sound in an effervescent solid bath additive, a compressed tablet is considered to be advantageous from the viewpoint of being able to extend the time it takes for the tablet to dissolve in hot water (or water). As a solid bath additive, a tablet or briquette preparation containing an organic acid and a carbonate is also known. For example, Patent Document 1 describes that an effervescent compressed preparation containing a carbonate, an organic acid, and a component that is liquid at 25°C in an amount of more than 2% by mass and not more than 10% by mass, and that satisfies certain requirements, produces good carbon dioxide gas bubbles, has high storage stability, and can fully exert the effects of liquid components such as fragrances. Patent Document 2 discloses that a tablet containing sodium bicarbonate, sodium carbonate, an organic acid, and a cationic polymer, having a tablet hardness of 2 kgf or more, and having a liquid absorption time within a specified range, has high formulation stability and good disintegration properties even when a cationic polymer is combined with a carbon dioxide gas generator consisting of a carbonate and an acid. Patent Document 3 discloses that a foamable bath additive containing a specified amount of an organic acid, a carbonate, and an amino acid surfactant may be in a briquette type, and that while fine bubbles are generated, the foaming time in water is long, bubbles that have been generated are prevented from remaining on the surface of the water, and irritation to the skin is also reduced. Patent Document 4 discloses that a briquette-type effervescent bath additive contains at least one selected from the group consisting of organic acids, carbonates, silicic anhydride, and calcium silicate, an oily component that is liquid at 25°C, and a nonionic surfactant that is liquid at 25°C, and the total content of the oily component and the nonionic surfactant is equal to or less than a specified value, and that the granules are prevented from cracking or chipping, has good storage stability, and prevents floating bubbles and floating matter from appearing on the surface of hot water when dissolved therein. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2014-76978 A [Patent Document 2] JP 2019-189560 A [Patent Document 3] Patent Publication No. 2021-134149 [Patent Document 4] Patent Publication No. 2021-187778 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the techniques disclosed in Patent Documents 1 to 4, when a tablet or briquette preparation is put into hot water (or water), it does not foam for a long time both in the hot water and on the surface of the hot water, and it does not produce a sufficient foaming sound. In order to produce a sufficient foaming sound, it is necessary to increase the foaming power, but increasing the foaming power shortens the dissolution time of the tablet, which is not compatible with extending the foaming time. The present invention relates to a solid compression molded tablet that can provide a sufficient effervescent time and effervescent sound when placed in hot water (or water). [Means for solving the problem]

[0008] The inventors have discovered that the above problem can be solved by a compressed tablet which contains a specified organic acid, a carbonate, and a specified oil in specified proportions, and has a tablet volume and hardness of at least specified values. That is, the present invention provides an effervescent compression-molded tablet comprising an organic acid (A), a carbonate (B), and an oil agent (C) having a viscosity of 100 mPa s or less at 25°C, the component (A) contains 70 mass% or more of an organic acid (A1) having a solubility of 10 g or less in 100 mL of water at 20°C; The content of the component (A) in the tablet is 40% by mass or more, The content of the component (B) in the tablet is 38% by mass or more, The volume of the tablet is 7.5 cm 3 That's all. The ratio of the mass of the component (C) in the tablet to the volume of the tablet is 2.0 mg / cm 3 That's all. The present invention relates to effervescent compressed tablets having a tablet hardness of 20 kgf or more. Effect of the Invention

[0009] According to the present invention, there is provided an effervescent compression molded tablet that can provide sufficient effervescent time and effervescent sound when added to hot water (or cold water). The tablet can be suitably used as a carbon dioxide gas effervescent solid bath additive. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] [Effervescent compressed tablets] The effervescent compression molded tablet of the present invention (hereinafter also simply referred to as "the tablet of the present invention") is an effervescent compression molded tablet containing an organic acid (A), a carbonate (B), and an oil agent (C) having a viscosity of 100 mPa s or less at 25°C, wherein the component (A) contains 70% by mass or more of an organic acid (A1) having a solubility of 10 g or less in 100 mL of water at 20°C, the content of the component (A) in the tablet is 40% by mass or more, the content of the component (B) in the tablet is 38% by mass or more, and the volume of the tablet is 7.5 cm 3 or more, and the ratio of the mass of the component (C) in the tablet to the volume of the tablet is 2.0 mg / cm 3 and the hardness of the tablet is 20 kgf or more. The tablet of the present invention has the above-mentioned constitution, and therefore when placed in hot water (or cold water), it can provide a sufficient effervescent time and effervescent sound. In this specification, the term "effervescent tablet" refers to a tablet that has the property of effervescently effervescent (carbonating) when dissolved in hot water (or water). In this specification, "sufficient effervescence time" means that when the tablet is placed in hot water (or water), the total effervescence time in the water and on the surface of the water is long, and the effervescence sound persists. In addition, "sufficient effervescence sound" means that when the tablet is placed in hot water (or water), the user can hear the effervescence sound. These can be specifically measured and evaluated by the methods described in the Examples.

[0011] The reason why the tablet of the present invention exhibits the above-mentioned effects is believed to be as follows. The tablet of the present invention exhibits carbonation effervescence by containing component (A) and component (B). When the contents of component (A) and component (B) in the tablet are each equal to or greater than a predetermined value, a sufficient amount of effervescence can be obtained. Therefore, in the present invention, which extends the dissolution time, it is possible to obtain a sufficient effervescent sound during dissolution. Furthermore, it is believed that the effervescence time can be extended by containing a predetermined amount or more of organic acid (A1) having a solubility of 10 g or less in 100 mL of water at 20°C in component (A). The tablet of the present invention further contains an oil agent (C) having a viscosity of 100 mPa·s or less at 25°C. By containing an oil agent (C) having a viscosity of a predetermined value or less, it is possible to suppress the penetration of hot water (or cold water) into the inside of the tablet. This is thought to enable the dissolution time of the tablet to be extended. The tablet of the present invention is a compression molded tablet and has a hardness of a predetermined value or more. The volume of the tablet is a predetermined value or more, and the ratio of the mass of the component (C) in the tablet to the volume of the tablet is a predetermined value or more. This is thought to suppress the intrusion of hot water (or water) into the inside of the tablet when the tablet is put into hot water (or water), thereby making it possible to extend the dissolution time of the tablet. By satisfying the above requirements, the tablet of the present invention can obtain a sufficient effervescence time while ensuring a sufficient effervescence sound. Furthermore, when the tablet is put into hot water (or water), the tablet can be given the property of rising from the water to the surface during dissolution and effervescence in the water and on the surface for a certain period of time or more, which is considered to result in a change in the effervescence sound during use.

[0012] <Component (A): Organic acid> The tablet of the present invention contains an organic acid as component (A). By containing component (A), the tablet of the present invention exhibits carbon dioxide effervescence through the action of component (B). In addition, it is believed that sufficient effervescence time, effervescence sound, and change in the effervescence sound can be obtained by containing a predetermined amount or more of organic acid (A1) having a solubility of 10 g or less in 100 mL of water at 20°C in component (A).

[0013] (Component (A1): an organic acid with a solubility of 10 g or less in 100 mL of water at 20°C) Component (A) contains 70 mass % or more of an organic acid (A1) having a solubility of 10 g or less in 100 mL of water at 20°C. The solubility of component (A1) in 100 mL of water at 20° C. is 10 g or less, preferably 8.0 g or less, more preferably 5.0 g or less, even more preferably 2.0 g or less, and even more preferably 1.0 g or less, from the viewpoint of obtaining sufficient foaming time and change in foaming sound. Also, from the viewpoint of obtaining solubility in hot water (or water), it is preferably 0.1 g or more, more preferably 0.2 g or more, and even more preferably 0.3 g or more. Component (A1) may be, in addition to carboxylic acid compounds, organic sulfonic acid compounds, and organic phosphoric acid compounds, but from the viewpoint of obtaining sufficient foaming time, foaming sound, and change in foaming sound, carboxylic acid compounds are preferred. The carboxylic acid compound may be a compound having at least one carboxy group, but polyvalent carboxylic acids having two or more carboxy groups are preferred. The carboxylic acid compound may be either an aliphatic carboxylic acid or an aromatic carboxylic acid.

[0014] Among the components (A1), examples of the aliphatic carboxylic acids include fumaric acid (0.49 g), succinic acid (8.0 g), adipic acid (2.2 g), etc., and examples of the aromatic carboxylic acids include benzoic acid (0.3 g), salicylic acid (0.2 g), pyrrolidone carboxylic acid (5.7 g), etc. The values ​​in parentheses indicate the solubility in 100 mL of water at 20°C (the same applies in the following descriptions). Among these, from the viewpoints of obtaining a sufficient foaming time, foaming sound, and change in foaming sound, as well as moldability, solubility in hot water (or water), and economic efficiency, component (A1) is preferably an aliphatic carboxylic acid, more preferably one or more selected from the group consisting of fumaric acid, succinic acid, and adipic acid, still more preferably one or more selected from the group consisting of fumaric acid and succinic acid, still more preferably containing fumaric acid, and still more preferably consisting of fumaric acid alone or fumaric acid and succinic acid.

[0015] From the viewpoint of obtaining a sufficient foaming time and a sufficient change in foaming sound, the component (A) contains an organic acid (A1) in an amount of 70 mass % or more, preferably 80 mass % or more, more preferably 90 mass % or more, and even more preferably 95 mass % or more, and 100 mass % or less.

[0016] In addition, component (A) may contain an organic acid (A2) other than component (A1) within a range that does not impair the effects of the present invention. Component (A2) may be any organic acid having a solubility of more than 10 g in 100 mL of water at 20° C., and is preferably a carboxylic acid compound similar to component (A1) from the viewpoints of obtaining a sufficient foaming sound, moldability, solubility in hot water (or water), and economic efficiency. Specific examples of component (A2) include tartaric acid (20.6 g), malic acid (56 g), citric acid (62 g), maleic acid (47.8 g), glutaric acid (63.9 g), and oxalic acid (13.3 g).

[0017] The content of component (A) in the tablet of the present invention is 40% by mass or more, preferably 42% by mass or more, more preferably 45% by mass or more, from the viewpoint of obtaining sufficient effervescence time, effervescence sound, and change in effervescence sound. Also, from the viewpoint of solubility in hot water (or water) and moldability of the tablet, it is preferably 60% by mass or less, more preferably 55% by mass or less, even more preferably 50% by mass or less, and even more preferably 48% by mass or less.

[0018] <Component (B): Carbonate> The tablet of the present invention contains a carbonate salt as component (B). By containing component (B), the tablet of the present invention exhibits carbon dioxide gas effervescence through the action of component (A).

[0019] Examples of component (B) include dialkali metal carbonates such as sodium carbonate and potassium carbonate; alkali metal bicarbonates such as sodium hydrogen carbonate and potassium hydrogen carbonate; alkaline earth metal carbonates such as calcium carbonate and magnesium carbonate; and the like, and one or more of these can be used. Among these, from the viewpoint of obtaining a sufficient foaming time, foaming sound, and change in foaming sound, as well as from the viewpoints of moldability, solubility in hot water (or water), and economic efficiency, it is preferably one or more selected from the group consisting of dialkali metal carbonates and alkali metal bicarbonates, more preferably one or more selected from the group consisting of sodium carbonate and sodium hydrogen carbonate, even more preferably sodium carbonate, still more preferably sodium carbonate and sodium hydrogen carbonate, and even more preferably sodium carbonate and sodium hydrogen carbonate.

[0020] When component (B) contains sodium carbonate and sodium bicarbonate, the mass ratio of the content of sodium bicarbonate to sodium carbonate [sodium bicarbonate / sodium carbonate] is, from the viewpoint of obtaining a sufficient foaming amount and of moldability, preferably 0.50 or more, more preferably 0.60 or more, even more preferably 0.70 or more, and is preferably 1.5 or less, more preferably 1.3 or less, even more preferably 1.2 or less, and still more preferably 1.1 or less.

[0021] The content of component (B) in the tablet of the present invention is 38% by mass or more, preferably 40% by mass or more, from the viewpoint of obtaining sufficient effervescence time, effervescence sound, and change in effervescence sound. Also, from the viewpoint of solubility in hot water (or water) and moldability, it is preferably 60% by mass or less, more preferably 55% by mass or less, even more preferably 50% by mass or less, and even more preferably 45% by mass or less.

[0022] The molar equivalent ratio of component (B) to component (A) in the tablet of the present invention [(B) / (A)] is, from the viewpoint of obtaining a sufficient effervescence time, effervescence sound, and change in effervescence sound, preferably 0.60 or more, more preferably 0.70 or more, even more preferably 0.75 or more, and is preferably 1.0 or less, more preferably 0.95 or less, even more preferably 0.90 or less, and even more preferably 0.85 or less.

[0023] <Component (C): An oil with a viscosity of 100 mPa·s or less at 25°C> The tablet of the present invention contains, as component (C), an oil agent having a viscosity of 100 mPa s or less at 25° C. By containing the oil agent (C), the tablet of the present invention is thought to prolong the dissolution time of the tablet in hot water (or water), thereby enabling a sufficient effervescence time and change in the effervescence sound to be obtained. In this specification, the term "oily agent" refers to an oily agent other than a fragrance.

[0024] From the viewpoint of extending the dissolution time of the tablet in hot water (or water), the viscosity of component (C) at 25°C is 100 mPa·s or less, preferably 80 mPa·s or less, more preferably 70 mPa·s or less, even more preferably 60 mPa·s or less, even more preferably 50 mPa·s or less, even more preferably 40 mPa·s or less, even more preferably 30 mPa·s or less, even more preferably 20 mPa·s or less, even more preferably 15 mPa·s or less, and even more preferably 10 mPa·s or less. There is no particular lower limit to the viscosity, but it is preferably 1.0 mPa·s or more, more preferably 2.0 mPa·s or more, even more preferably 3.0 mPa·s or more, even more preferably 5.0 mPa·s or more, and even more preferably 7.0 mPa·s or more. When two or more oils are used as component (C), "the viscosity of component (C) at 25°C" means the viscosity of the mixed oil at 25°C, and it is sufficient that the viscosity of the mixed oil is 100 mPa s or less. The viscosity of component (C) at 25° C. can be measured using a rotational viscometer according to the method described in the Examples.

[0025] Specific examples of component (C) include oils typically used in bath additives, such as one or more oils selected from the group consisting of silicone oil, ester oil, ether oil, hydrocarbon oil, higher alcohol, and higher fatty acid, and having a viscosity of 100 mPa s or less at 25°C.

[0026] (Silicone oil) The silicone oil is preferably at least one selected from the group consisting of dimethylpolysiloxane (dimethicone), dimethiconol (dimethylpolysiloxane having a hydroxyl group at the end), methylphenylpolysiloxane, and modified silicone. Examples of modified silicones include amino-modified silicones (dimethylpolysiloxanes having an amino group, such as amodimethicone), polyether-modified silicones, aminopolyether-modified silicones (silicones having an amino group and a polyether structure), glyceryl-modified silicones, carboxy-modified silicones, fatty acid-modified silicones, alcohol-modified silicones, aliphatic alcohol-modified silicones, epoxy-modified silicones, fluorine-modified silicones, and alkyl-modified silicones. Among the above, from the viewpoint of extending the dissolution time of the tablet in hot water (or water), the silicone oil is preferably one or more selected from the group consisting of dimethylpolysiloxane, dimethiconol, methylphenylpolysiloxane, and modified silicone, more preferably one or more selected from the group consisting of dimethylpolysiloxane, dimethiconol, amino-modified silicone, polyether-modified silicone, and aminopolyether-modified silicone, and even more preferably dimethylpolysiloxane.

[0027] (Ester oil) Examples of the ester oil include esters of a monovalent carboxylic acid and a monohydric alcohol, esters of a monovalent carboxylic acid and a polyhydric alcohol, and esters of a polyvalent carboxylic acid and a monohydric alcohol.

[0028] Examples of the ester of a monovalent carboxylic acid and a monohydric alcohol include the ester represented by the following general formula (1). R 1 -COO-R 2 (1) In the general formula (1), R 1 represents a linear or branched alkyl or alkenyl group having 1 to 25 carbon atoms, which may be substituted with a hydroxyl group, or an aromatic hydrocarbon group having 6 to 24 carbon atoms, R 2 represents a linear or branched alkyl or alkenyl group having 1 to 30 carbon atoms.

[0029] R 1 When is an alkyl group or an alkenyl group, it preferably has 7 or more carbon atoms and preferably has 23 or less, more preferably 21 or less, even more preferably 19 or less, and still more preferably 17 or less. R 1 When is an aromatic hydrocarbon group, the number of carbon atoms is preferably 6 or more and preferably 22 or less, more preferably 20 or less. R 2 The number of carbon atoms is preferably 2 or more, and is preferably 28 or less, more preferably 24 or less, and further preferably 20 or less.

[0030] Specific examples of the ester represented by the general formula (1) include cetyl isooctanoate, stearyl isooctanoate, isononyl isononanoate, isotridecyl isononanoate, hexyl laurate, isostearyl laurate, butyl myristate, isopropyl myristate, decyl myristate, isotridecyl myristate, isocetyl myristate, isostearyl myristate, octyldodecyl myristate, isopropyl palmitate, 2-ethylhexyl palmitate, and palmitic acid. Examples of the fatty acid esters include isostearyl ester, 2-hexyldecyl palmitate, 2-ethylhexyl stearate, 2-hexyldecyl stearate, isopropyl isostearate, 2-hexyldecyl isostearate, ethyl oleate, isodecyl oleate, oleyl oleate, octyldodecyl oleate, ethyl linoleate, isopropyl linoleate, lanolin acetate, castor oil fatty acid methyl ester (methyl ricinoleate), and alkyl benzoate (alkyl carbon number 12 to 15).

[0031] Examples of the ester of a monovalent carboxylic acid and a monohydric alcohol include an ester represented by the following general formula (2). R 3 -COO-(AO) n -R 4 (2) In the general formula (2), R 3 represents a linear or branched alkyl or alkenyl group having 1 to 25 carbon atoms, which may be substituted with a hydroxyl group; R 4 represents an aromatic hydrocarbon group having 6 to 24 carbon atoms, AO represents an alkyleneoxy group having 2 to 4 carbon atoms, and n represents the average number of moles added of 1 to 50. R 3 is preferably an alkyl group having 7 or more carbon atoms and preferably 23 or less, more preferably 21 or less, and even more preferably 19 or less. R 4 is preferably an aromatic-containing hydrocarbon group having 6 or more carbon atoms and preferably 22 or less, more preferably 20 or less, even more preferably 18 or less, and still more preferably a benzyl group. The AO group is preferably a propyleneoxy group, and n is preferably 1 or more and 10 or less, more preferably 1 or more and 5 or less. Specific examples of the ester represented by the general formula (2) include an ester of myristic acid and a 3-mol propylene oxide adduct of benzyl alcohol, and an ester of 2-ethylhexanoic acid and a 3-mol propylene oxide adduct of benzyl alcohol.

[0032] Examples of the ester of a monovalent carboxylic acid and a polyhydric alcohol include the ester represented by the following general formula (3). R 5 -(OCOR 6 ) p (3) In the general formula (3), R 5 represents a polyhydric alcohol residue, preferably a hydrocarbon group having 2 to 10 carbon atoms; R 6 represents a monovalent carboxylic acid residue having 1 to 25 carbon atoms, and p represents an integer of 2 to 10. In addition, R 5 may have an ether bond, but is preferably a linear or branched hydrocarbon group having from 2 to 10 carbon atoms. Also, p is the same number as the number of hydroxy groups in the polyhydric alcohol. R 6 is preferably an alkyl group having 7 or more carbon atoms and preferably 23 or less, more preferably 21 or less, and even more preferably 19 or less.

[0033] Examples of the ester represented by the general formula (3) include propylene glycol dicaprate, propylene glycol dioleate, neopentyl glycol dicaprate, neopentyl glycol di-2-ethylhexanoate, propanediol di(caprylic acid / capric acid), propanediol diisostearate, ethylene glycol di-2-ethylhexanoate, glyceryl tri(caprylic acid / capric acid), glyceryl tri-2-ethylhexylate, glyceryl tri-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexylate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, etc. These are liquid under 1 atmosphere and 25°C. The ester oil may be either a synthetic ester oil or a natural oil. Examples of natural oils include triglycerides such as avocado oil, olive oil, sesame oil, rice bran oil, safflower oil, soybean oil, corn oil, rapeseed oil, castor oil, cottonseed oil, and mink oil.

[0034] Examples of the esters of polyvalent carboxylic acids and monohydric alcohols include esters represented by the following general formula (4). R 7 -(COOR 8 ) q (4) In the general formula (4), R 7 is a polycarboxylic acid residue having 2 to 10 carbon atoms, and R 8 represents a monohydric alcohol residue having 1 to 25 carbon atoms, and q is an integer of 2 to 10. In addition, q is the same number as the number of carboxy groups possessed by the polyvalent carboxylic acid. R 8 is preferably 3 or more, and preferably 23 or less, more preferably 21 or less, and even more preferably 19 or less. Specific examples include diisostearyl malate, di-2-ethylhexyl succinate, diisobutyl adipate, di-2-heptylundecyl adipate, di-2-ethylhexyl sebacate, diisopropyl sebacate, and tri-2-ethylhexyl trimellitate.

[0035] Among the above, from the viewpoint of extending the dissolution time of the tablet in hot water (or water), the ester oil is preferably one or more selected from the group consisting of esters represented by general formula (1), general formula (3) and general formula (4), more preferably one or more selected from the group consisting of esters represented by general formula (1) and general formula (3), even more preferably one or more selected from the group consisting of isopropyl myristate, isopropyl palmitate and tri(caprylic / capric acid)glyceryl, and even more preferably one or more selected from the group consisting of isopropyl myristate and isopropyl palmitate.

[0036] (Ether oil) The ether oil may be a dialkyl ether compound represented by the following general formula (5). R 9 -OR 10 (5) In the general formula (5), R 9 and R 10 each independently represents a linear or branched alkyl or alkenyl group having 6 to 22 carbon atoms, or an aromatic hydrocarbon group having 6 to 24 carbon atoms. R 9 and R 10 From the viewpoint of facilitating solidification of the composition, dispersibility in hot water (or water), and improving the moisturizing feeling during bathing, is preferably an alkyl group, and the number of carbon atoms therein is preferably 8 or more and preferably 18 or less, more preferably 16 or less, and even more preferably 12 or less.

[0037] (Hydrocarbon oil) The hydrocarbon oil may be one or more oils selected from the group consisting of squalene and squalane.

[0038] (Higher alcohol) As the higher alcohol, from the viewpoint of having a viscosity of 100 mPa s or less at 25°C, an unsaturated aliphatic monohydric alcohol or a branched aliphatic monohydric alcohol having 12 or more carbon atoms, preferably 12 to 22 carbon atoms, is preferred, and examples thereof include one or more selected from the group consisting of lauryl alcohol, oleyl alcohol, isostearyl alcohol, and 2-octyldodecanol. Among these, from the viewpoint of extending the dissolution time of the tablet in hot water (or water), 2-octyldodecanol is preferred.

[0039] (higher fatty acids) As the higher fatty acid, from the viewpoint of having a viscosity at 25°C of 100 mPa s or less, an unsaturated fatty acid or a branched fatty acid having 8 or more carbon atoms, preferably 12 to 22 carbon atoms, is preferred, and examples thereof include one or more types selected from the group consisting of oleic acid, isostearic acid, and isopalmitic acid.

[0040] The component (C) may be used alone or in combination of two or more of the above. Among the above, from the viewpoint of extending the dissolution time of the tablet in hot water (or water), component (C) is preferably one or more selected from the group consisting of ester oils and higher alcohols, more preferably one or more selected from the group consisting of esters represented by the general formula (1), esters represented by the general formula (3), and branched aliphatic monohydric alcohols having 12 to 22 carbon atoms, even more preferably one or more selected from the group consisting of isopropyl myristate, isopropyl palmitate, caprylic / capric triglyceride, and 2-octyldodecanol, even more preferably one or more selected from the group consisting of isopropyl myristate, isopropyl palmitate, and caprylic / capric triglyceride, and even more preferably one or more selected from the group consisting of isopropyl myristate and isopropyl palmitate.

[0041] The content of component (C) in the tablet of the present invention is preferably 0.02% by mass or more, more preferably 0.05% by mass or more, even more preferably 0.10% by mass or more, and even more preferably 0.15% by mass or more, from the viewpoint of extending the dissolution time of the tablet in hot water (or water). Also, from the viewpoint of solubility in hot water (or water) and moldability of the tablet, it is preferably 5.0% by mass or less, more preferably 3.0% by mass or less, even more preferably 2.0% by mass or less, even more preferably 1.0% by mass or less, and even more preferably 0.7% by mass or less.

[0042] The total content of components (A) to (C) in the tablet of the present invention is preferably 78.5% by mass or more, more preferably 80% by mass or more, and even more preferably 85% by mass or more, from the viewpoint of obtaining sufficient effervescence time, effervescence sound, and change in effervescence sound. The total content is 100% by mass or less, and from the viewpoint of solubility in hot water (or water) and tablet moldability, it is preferably 95% by mass or less, more preferably 90% by mass or less. The total content of component (A1), component (B) and component (C) in the tablet of the present invention is preferably 75% by mass or more, more preferably 78.5% by mass or more, even more preferably 80% by mass or more, and even more preferably 85% by mass or more, from the viewpoint of obtaining sufficient effervescence time, effervescence sound and change in effervescence sound. The total content is 100% by mass or less, and from the viewpoint of solubility in hot water (or water) and tablet moldability, it is preferably 95% by mass or less, more preferably 90% by mass or less, and even more preferably 88% by mass or less.

[0043] <Water-soluble polymer> The tablet of the present invention may further contain a water-soluble polymer from the viewpoint of improving solubility in hot water (or water) and moldability of the tablet. Examples of the water-soluble polymer include synthetic water-soluble polymers such as polyethylene glycol, polyvinylpyrrolidone, sodium polyacrylate, polyethyleneimine, and polyvinyl alcohol; natural water-soluble polymers such as glue, gelatin, collagen protein, casein, sodium alginate, carrageenan, furcellaran, tamarind gum, pectin, gum arabic, guar gum, xanthan gum, tragacanth gum, locust bean gum, dextrin, dextran, agar, and starch; semi-synthetic water-soluble polymers such as carboxymethylcellulose, methylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, cellulose acetate phthalate, propylene glycol alginate, oxidized starch, esterified starch, etherified starch, and cationic starch; and the like. Among these, one or more types can be used. Among these, from the viewpoint of improving the solubility in hot water (or water) and the moldability of tablets, one or more types selected from the group consisting of polyethylene glycol and dextrin are preferred, and polyethylene glycol is more preferred. The molecular weight of the polyethylene glycol is preferably 4,000 or more and 10,000 or less, and more preferably 5,000 or more and 9,000 or less.

[0044] When a water-soluble polymer is used, the content of the water-soluble polymer in the tablet is preferably 1.0% by mass or more, more preferably 1.5% by mass or more, even more preferably 2.0% by mass or more, and even more preferably 5.0% by mass or more, from the viewpoint of improving solubility in hot water (or water) and tablet moldability. Also, from the viewpoint of obtaining a sufficient amount of foaming, the content is preferably 15% by mass or less, more preferably 12% by mass or less.

[0045] <Other ingredients> The tablet of the present invention may contain other components that are generally used in bath additives. Examples of such components include nonionic surfactants such as sucrose fatty acid esters, polyethylene glycol fatty acid esters, polyoxyethylene alkyl ethers, and polyoxyethylene hydrogenated castor oil, and other surfactants; inorganic salts other than component (B), such as sodium sulfate, potassium chloride, sodium chloride, potassium nitrate, sodium nitrate, sodium polyphosphate, ammonium chloride, iron sulfate, sodium phosphate, and sodium thiosulfate; excipients such as calcium silicate and glucose; disintegration aids; medicinal ingredients such as herbal medicines; colorants; fragrances; oils other than component (C); and the like.

[0046] However, from the viewpoint of obtaining a sufficient amount of effervescence and from the viewpoint of extending the time for dissolving in hot water (or water), the tablet of the present invention preferably contains a small amount of surfactant. The content of surfactant in the tablet is preferably less than 1% by mass, more preferably less than 0.5% by mass, even more preferably less than 0.1% by mass, and even more preferably substantially no surfactant is contained.

[0047] <Volume> The volume of the tablet of the present invention is 7.5 cm from the viewpoint of obtaining a sufficient effervescence time and effervescence sound. 3 More than 8.0 cm, preferably 3 More than 9.0cm, preferably 9.0cm 3 More than 10cm, more preferably 3 More preferably, 12 cm 3 The upper limit is not particularly limited, but from the viewpoint of improving the solubility in hot water (or water) and the moldability of the tablet, and from the viewpoint of reducing the load on the device when compressing and molding a tablet having a desired hardness, it is preferably 35 cm 3 Less than or equal to 30cm, preferably 3 Less than 20cm, more preferably 3 Less than 15cm, more preferably 3 The following is the result.

[0048] The ratio of the mass of component (C) in the tablet to the volume of the tablet [mass of component (C) / volume of tablet] is set to 2.0 mg / cm from the viewpoint of obtaining a sufficient effervescence time, effervescence sound, and change in the effervescence sound. 3 or more, preferably 2.5 mg / cm 3 More preferably, 3.0 mg / cm 3 In addition, from the viewpoint of improving the solubility in hot water (or water) and the moldability of the tablet, and from the viewpoint of reducing the load on the device when compressing and molding a tablet having a desired hardness, the concentration is preferably 20 mg / cm. 3 Less than 15 mg / cm, more preferably 15 mg / cm 3 More preferably, 10 mg / cm 3 The following is the result.

[0049] <Surface area> The surface area of ​​the tablet of the present invention is preferably 22 cm from the viewpoint of obtaining a sufficient effervescence time and effervescence sound. 2 More than 25cm, preferably 25cm 2 More than 30cm, more preferably 30cm 2 In addition, from the viewpoint of improving the solubility in hot water (or water) and the moldability of the tablet, and from the viewpoint of reducing the load on the device when compressing and molding a tablet having a desired hardness, it is preferable to use a compression molding machine having a length of 60 cm. 2 Less than 50cm, preferably 50cm 2 Less than 40cm, more preferably 2 The following is the result.

[0050] The ratio of the mass of component (C) in the tablet to the surface area of ​​the tablet [mass of component (C) / surface area of ​​the tablet] is preferably 1.0 mg / cm from the viewpoint of obtaining a sufficient effervescence time, effervescence sound, and change in the effervescence sound. 2 In addition, from the viewpoint of improving the solubility in hot water (or water) and the moldability of the tablet, and from the viewpoint of reducing the load on the device when compressing and molding a tablet having a desired hardness, the concentration is preferably 15 mg / cm. 2 Less than 10 mg / cm, more preferably 10 mg / cm 2 More preferably, 5.0 mg / cm 2 The following is the result.

[0051] The volume and surface area of ​​a tablet can be calculated by measuring the dimensions if the tablet is cylindrical, for example. If the tablet has a complex shape or has grooves or unevenness on the surface, it can be measured using a 3D scanner (Keyence Corporation's "VL-500"), etc. The surface area of ​​the tablet in this specification excludes grooves, irregularities, etc. formed on the surface of the tablet. For example, when the shape of a tablet is scanned with a 3D scanner, a smooth surface covering the outermost surface of the tablet is assumed, and the surface area of ​​the tablet is defined as the surface area of ​​the tablet.

[0052] <Mass> The mass of the tablet of the present invention is preferably 10 g or more, more preferably 12 g or more, and even more preferably 15 g or more from the viewpoint of obtaining a sufficient effervescence time and effervescence sound. Also, from the viewpoint of improving solubility in hot water (or water) and tablet moldability, and from the viewpoint of reducing the load on the device when compressing and molding a tablet having a desired hardness, the mass is preferably 35 g or less, more preferably 30 g or less, and even more preferably 25 g or less.

[0053] <shape> The shape of the tablet of the present invention may be any shape, such as a cylindrical shape having a circular planar shape, a square shape, a star shape, a heart shape, etc. Among these, the cylindrical shape is preferred from the viewpoint of ease of production of a compression molded tablet having a desired hardness. When the tablet is cylindrical, the diameter is preferably 20 mm or more, more preferably 25 mm or more, and even more preferably 30 mm or more from the viewpoint of obtaining a sufficient foaming time and foaming sound, and is preferably 50 mm or less, more preferably 45 mm or less, and even more preferably 40 mm or less from the viewpoint of improving solubility in hot water (or water) and tablet moldability, and from the viewpoint of reducing the load on the device when compressing and molding a tablet having a desired hardness. The thickness of the tablet is preferably 5 mm or more and 20 mm or less, and more preferably 10 mm or more and 15 mm or less. From the viewpoint of ease of production of a compressed tablet having a desired hardness and from the viewpoint of extending the time for dissolving the tablet in hot water (or water), it is preferable that the tablet has neither grooves nor irregularities on the surface. However, it is permissible for the tablet to have minute irregularities that may be formed during production.

[0054] <Hardness> The hardness of the tablet of the present invention is 20 kgf or more, preferably 22 kgf or more, more preferably 24 kgf or more, from the viewpoint of extending the dissolution time of the tablet in hot water (or water). Also, from the viewpoint of improving the solubility in hot water (or water) and the moldability of the tablet, and from the viewpoint of reducing the load on the device when compressing the tablet, the hardness is preferably 40 kgf or less, more preferably 35 kgf or less, even more preferably 30 kgf or less, and even more preferably 26 kgf or less. The hardness of the tablet can be measured using a hardness tester according to the method described in the Examples. The hardness of the tablet can be adjusted by the type and amount of the ingredients used, the volume and mass of the tablet, and the compression molding conditions (particularly the pressure conditions) during tablet production.

[0055] <Dosage form, manufacturing method> The tablet of the present invention is a compression molded tablet from the viewpoint of obtaining a tablet having a desired hardness. The compression molded tablet means a tablet produced by a compression molding method, and includes tableting and briquette molding. Among these, tableting is preferable from the viewpoint of imparting the desired hardness described above.

[0056] The tablet of the present invention can be produced by compression molding in a conventional manner using a press tableting machine or a briquetting machine. In producing a tableting or briquetting agent, for example, all of the components constituting the tablet of the present invention may be dry-blended to obtain a powder, which is then subjected to compression molding. Alternatively, a portion of the components may be granulated or molded in advance, and then mixed with the remaining components to obtain a mixture, which is then subjected to compression molding.

[0057] [Bath additives] The present invention further provides a bath additive comprising the effervescent compressed tablet. The types and contents of the components contained in the bath additive of the present invention, as well as the properties, shape, and preferred ranges thereof, are the same as those described above. EXAMPLES

[0058] The present invention will be described below with reference to examples, but the present invention is not limited to the scope of the examples.

[0059] Examples 1 to 9 and Comparative Examples 1 to 8 (Preparation and Evaluation of Effervescent Compression-Molded Tablets (Bath Additives)) The powder obtained by mixing the components shown in Table 1 was compressed and molded at approximately 10 MPa using a hydraulic tablet press to produce cylindrical tablets having a mass of 20 g, a diameter of 35 mm, and a thickness of approximately 13.5 mm (Examples 1 to 9, Comparative Examples 1 to 7), or cylindrical tablets having a mass of 10 g, a diameter of 25 mm, and a thickness of approximately 13.5 mm (Comparative Example 8). The obtained effervescent compression molded tablets were subjected to various measurements and evaluations by the following methods. The results are shown in Table 1. The blending amount (mass%) of each component shown in Table 1 is the active amount.

[0060] <Viscosity> The viscosity of the oil at 25° C. was measured using a rotational viscometer ("TVB-10" manufactured by Toki Sangyo Co., Ltd.).

[0061] <Hardness> The hardness of the compressed tablets obtained in each example was measured using a hardness tester "043019-D" manufactured by Fujiwara Seisakusho Co., Ltd. A load was applied so that the center of the pin of the hardness tester (made of stainless steel, tip diameter 5 mm) hit a point 5 mm from the outer periphery of the tablet toward the center, and the load value at which the tablet broke was recorded as the tablet hardness. Two tablets were measured, and the average value was used as the evaluation value. It is expressed in kgf.

[0062] <Foaming time> (1) Total foaming time The total of the "submerged foaming time" and "surface foaming time" is shown in Table 1. A total foaming time of 7 minutes or more was considered to be acceptable, and a total foaming time of 9 minutes or more was considered to be more preferable. (2) Foaming time in hot water The compressed tablets obtained in each example (2 or 4 tablets, total 40 g) were placed in a bathtub filled with 150 L of hot water at 40°C, and the effervescence time in the hot water was measured and shown in Table 1. The effervescence time was the average of the effervescence time for 2 or 4 tablets. (3) Time required for foaming on the surface of the water The compressed tablets obtained in each example (2 or 4 tablets, total 40 g) were placed in a bathtub filled with 150 L of hot water at 40°C, and the effervescence time at the surface of the water was measured and shown in Table 1. The effervescence time was the average of the effervescence times for 2 or 4 tablets.

[0063] <bubbling noise> (1) Loudness of foaming noise The compressed tablets obtained in each example (40g in total) were dropped into a bathtub filled with 150L of water at 40℃, and the loudness of the bubbling sound was evaluated on a four-point scale by a panel of three experts according to the following criteria. The evaluation was based on the bubbling sound 30 seconds after the bath additive was added. Evaluations A and B were considered to be acceptable, and C and D were considered to be unacceptable. A: I can hear it well enough. B: I can hear it. C: I can hear it, but it's quiet. D: Hardly audible (2) Bubbling sound persistence The compressed tablets obtained in each example (40 g in total) were dropped into a bathtub filled with 150 L of hot water at 40°C, and the time from when the bubbling sound disappeared to when it disappeared was measured, and the tablets were rated on a three-point scale according to the following criteria. Ratings A and B were considered acceptable, and rating C was considered unacceptable. A: 9 minutes or more B: 7 minutes or more but less than 9 minutes C: Less than 7 minutes (3) Changes in foaming sound The compressed tablets obtained in each example (40 g in total) were placed in a bathtub filled with 150 L of hot water at 40°C, and the change in the bubbling sound was evaluated on a four-point scale by a panel of three experts in accordance with the following criteria. AA: Both foaming noise in the bath and on the surface last for 3 minutes or more A: Either the submerged foaming sound or the foaming sound on the surface of the molten metal lasts for 2 minutes or more but less than 3 minutes B: Either the foaming sound in the molten metal or the foaming sound on the molten metal surface lasts for 1.5 minutes or more but less than 2 minutes C: Either the submerged or surface bubbling sound is less than 1.5 minutes

[0064] [Table 1]

[0065] Details of the components listed in the table are as follows. Isopropyl myristate: Kao Corporation's "Excepearl IPM" Isopropyl palmitate: Kao Corporation's "Excepearl IPP" Caprylic / capric triglyceride: Kao Corporation's "Coconard MT" Liquid Paraffin: "Kaidor" manufactured by Sonneborn LLC Polyoxyethylene sorbitan monooleate (6E.O.): "Rheodor TW-O106V" manufactured by Kao Corporation Polyethylene glycol: Kao Corporation "PEG6000" (molecular weight 6,000)

[0066] From Table 1, it can be seen that the effervescent compression molded tablet of this Example is excellent in both effervescence time and effervescence sound. In contrast, the compression molded tablet of this Comparative Example was inferior in either effervescence time or effervescence sound. The effervescent compression molded tablet of Example 9, in which a surfactant was blended, had slightly shorter effervescent time and effervescent sound than Examples 1 to 8, in which no surfactant was blended. [Industrial Applicability]

[0067] According to the present invention, there is provided an effervescent compression molded tablet that can provide sufficient effervescent time and effervescent sound when added to hot water (or cold water). The tablet can be suitably used as a carbon dioxide gas effervescent solid bath additive.

Claims

1. An effervescent compression-molded tablet comprising an organic acid (A), a carbonate (B), and an oil (C) having a viscosity of 100 mPa s or less at 25°C, the component (A) contains 70 mass% or more of an organic acid (A1) having a solubility of 10 g or less in 100 mL of water at 20°C; The content of the component (A) in the tablet is 40% by mass or more, The content of the component (B) in the tablet is 38% by mass or more, The volume of the tablet is 7.5 cm ３ That's all, The ratio of the mass of the component (C) in the tablet to the volume of the tablet is 2.0 mg / cm ３ That's all, An effervescent compression-molded tablet having a hardness of 20 kgf or more.

2. 2. The effervescent compressed tablet according to claim 1, wherein the mass of the tablet is 15 g or more and 25 g or less.

3. 3. The effervescent compressed tablet according to claim 1, wherein the tablet has a cylindrical shape with a diameter of 30 mm to 40 mm.

4. A bath additive comprising the effervescent compressed tablet according to claim 1 or 2.