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JP-2026075486-A - Method for producing an emulsified composition

JP2026075486AJP 2026075486 AJP2026075486 AJP 2026075486AJP-2026075486-A

Abstract

[Problem] To provide a method for producing an emulsified composition in which the viscosity of the emulsified composition is reduced during the manufacturing process. [Solution] A method for producing an emulsion composition, comprising the steps of: (I-1) heating and dissolving (A) a cationic surfactant and (B) a higher alcohol that is solid at 25°C to prepare an oil phase; (II-1) preparing an aqueous phase containing water; (III) mixing the oil phase and the aqueous phase, which are at a temperature higher than the aqueous phase or at the same temperature of 75°C or lower, to obtain an emulsion; and (IV) adding to the emulsion one or more selected from the group consisting of (D) amphoteric surfactants, cationic surfactants, nonionic surfactants, inorganic salts, polyhydric alcohols, polyalkylene glycol derivatives of polyhydric alcohols, and lower alcohols. [Selection Diagram] None

Inventors

  • ▲吉▼川 奈央

Assignees

  • 株式会社ミルボン

Dates

Publication Date
20260508
Application Date
20241022

Claims (7)

  1. (I-1) A step of preparing an oil phase by heating and dissolving (A) a cationic surfactant and (B) a higher alcohol that is solid at 25°C, (C) A step of preparing an aqueous phase containing water (II-1), (III) A step of mixing the oil phase and the aqueous phase, which are at a higher temperature than the aqueous phase, or mixing the oil phase and the aqueous phase at the same temperature of 75°C or lower to obtain an emulsion, (IV) Adding to the emulsion one or more selected from the group consisting of (D) amphoteric surfactants, cationic surfactants, nonionic surfactants, inorganic salts, polyhydric alcohols, polyalkylene glycol derivatives of polyhydric alcohols, and lower alcohols, A method for producing an emulsified composition containing [the specified element].
  2. (B) A step (I-2) to prepare an oil phase by heating and dissolving a higher alcohol that is solid at 25°C, (A) A step of preparing an aqueous phase containing a cationic surfactant and (C) water (II-2), (III) A step of mixing the oil phase and the aqueous phase, which are at a higher temperature than the aqueous phase, or mixing the oil phase and the aqueous phase at the same temperature of 75°C or lower to obtain an emulsion, (IV) Adding to the emulsion one or more selected from the group consisting of (D) amphoteric surfactants, cationic surfactants, nonionic surfactants, inorganic salts, polyhydric alcohols, polyalkylene glycol derivatives of polyhydric alcohols, and lower alcohols, A method for producing an emulsified composition containing [the specified element].
  3. In the above step (III), When mixing the oil phase, which is at a higher temperature than the aqueous phase, with the aqueous phase, the temperature of the oil phase at the time of mixing is 50°C or higher. When the oil phase and the aqueous phase are mixed at the same temperature of 75°C or lower, the temperatures of the oil phase and the aqueous phase during mixing are the same, between 50°C and 75°C. A method for producing the emulsified composition according to claim 1 or 2.
  4. Step (IV) is performed immediately after step (III), or when the temperature of the emulsion obtained in step (III) is 75°C or lower. A method for producing the emulsified composition according to claim 1 or 2.
  5. In step (III) above, when mixing an oil phase with a water phase that is at a higher temperature than the water phase, the temperature difference between the temperature of the oil phase and the temperature of the water phase is 5°C or more. A method for producing the emulsified composition according to claim 1 or 2.
  6. The aforementioned component (D) is one or more selected from the group consisting of amphoteric surfactants and cationic surfactants. A method for producing the emulsified composition according to claim 1 or 2.
  7. The proportion of component (D) to the emulsified composition is 0.02% by mass or more. A method for producing the emulsified composition according to claim 1 or 2.

Description

This invention relates to a method for producing an emulsified composition. Emulsified compositions, consisting of an oil phase and an aqueous phase, are known as cosmetic products such as rinses and conditioners. As a method for producing this type of emulsion composition, for example, Patent Document 1 discloses a method for producing an emulsion composition comprising the steps of: preparing an oil phase; preparing an aqueous phase; obtaining an emulsion composition by adding and mixing the oil phase to the aqueous phase at a temperature of 50°C to 70°C; and mixing an aromatic alcohol after cooling the obtained emulsion composition to 35°C or higher. The method in Patent Document 1 is characterized by temporarily holding the emulsion composition at a temperature intermediate between the emulsification temperature (50-70°C) and room temperature after the emulsification step, and then adding the aromatic alcohol. Non-Patent Document 1 discloses a method for producing an emulsion composition containing a cationic surfactant and a higher alcohol, in which the oil phase and aqueous phase are heated and dissolved at 80°C, and the aqueous phase is gradually added while stirring the oil phase at 80°C to emulsify it. Patent Document 2 discloses a method for producing an emulsified composition, which includes a high-pressure emulsification step in which an oil phase containing oil and an aqueous phase containing an amphoteric surfactant and water are emulsified using a high-pressure emulsifier. The method for producing an emulsified composition described in Patent Document 2 states that by performing emulsification under a pressure of 0.5 MPa to 120 MPa using a high-pressure homogenizer or the like, an emulsified composition with good emulsification stability can be obtained. Japanese Patent Publication No. 2014-114223Japanese Patent Publication No. 2017-19753 Personal Care Handbook, Volume II, pages 862-863 (Published June 7, 2016, Nikko Chemicals Co., Ltd., et al.) The method for producing the emulsified composition according to this disclosure comprises the steps of (I) preparing an oil phase of a specific composition, (II) preparing an aqueous phase, and (III) obtaining an emulsion by mixing the aqueous phase and the oil phase at a specific temperature, plus (IV) adding (D) one or more substances selected from the group consisting of amphoteric surfactants, cationic surfactants, nonionic surfactants, inorganic salts, polyhydric alcohols, polyalkylene glycol derivatives of polyhydric alcohols, and lower alcohols to the obtained emulsion. Conventionally, in the production of emulsified compositions containing cationic surfactants and higher alcohols, a known method involves heating and dissolving the oil phase and aqueous phase at 80°C, and then gradually adding the aqueous phase while stirring the oil phase at 80°C to emulsify (Non-Patent Literature 1). Thus, conventional methods for producing emulsified compositions require separate thermal energy for preparing the oil phase and the aqueous phase. In contrast, the production method according to this disclosure involves performing emulsification at a lower temperature than conventional methods for the oil and aqueous phases, followed by the addition of specific components. These steps reduce thermal energy while lowering the viscosity of the emulsified composition during the production process. Furthermore, an emulsified composition with moderate viscosity after production can be obtained. [Specific examples of embodiments] The manufacturing method relating to this disclosure will be described in more detail below. In this specification, unless otherwise specified, "A to B" representing a numerical range means "A or greater and B or less". (Component A) In the manufacturing method according to this disclosure, component (A) is a cationic surfactant. The cationic surfactant is not particularly limited as long as the effects according to this disclosure are obtained, but cationic surfactants incorporated into hair cosmetics are preferably used. The cationic surfactant may be a cationic surfactant having a hydrocarbon group with 8 to 24 carbon atoms, and examples include fatty acid ester amine salts, fatty acid amidoamine salts, urea condensed amine salt type tertiary amine salts (Arcover type tertiary amine salts), long-chain alkyltrimethylammonium salts (e.g., stearyltrimethylammonium chloride), di-long-chain alkyldimethylammonium salts, tri-long-chain alkylmonomethylammonium salts, benzalkonium type quaternary ammonium salts, monoalkyl ether type quaternary ammonium salts, etc. (Note that the above "long-chain alkyl" may be an alkyl group having 12 to 22 carbon atoms). One cationic surfactant may be incorporated, or two or more cationic surfactants may be incorporated. (A) When a long-chain alkyltrimethylammonium salt is included as component, examples of such ammonium salts include lauryltrimethylammonium chloride, cetyltrimethylammonium chloride, cetyltrimeth