JP2000087100A - Control of viscosity of liquid composition containing cationic surfactant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the viscosity of a liq. compsn, contg. a cationic surfactant to be kept in a specified range without being affected by the lots of its materials. SOLUTION: In producing a liq. compsn. contg. a cationic surfactant, the viscosity of the compsn. is controlled by the following methods: (1) a liq. crystal structure is formed by adding a water phase to a surfactant-contg. oil phase and then a water phase is further added and mixed to cause the phase inversion in order to form an O/W emulsion, provided that in the latter step, a nonionic surfactant is compounded under the control of the compounding ratio of the liq. crystal-forming system to the phase inversion system; (2) the compounding ratio of the water phase is controlled so that the concn. of the cationic surfactant in the liq. crystal structure is 8-74 wt.%; and (3) an inorg. salt is compounded in such an amt. that its concn. in the compsn. is 0-3 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a cationic surfactant which can control the viscosity of a liquid composition containing a cationic surfactant by controlling the viscosity of the composition obtained by means of compounding the components when the composition is produced. The present invention relates to a method for controlling the viscosity of a surfactant-containing liquid composition.

[0002]

2. Description of the Related Art Conventionally, a liquid composition containing a cationic surfactant in an aqueous liquid has been used for hair care products such as hair rinse agents and hair treatment agents, cosmetics such as emulsions and creams, and liquids. It is suitably used as a product such as a fiber treatment agent such as a detergent or a softener or as a raw material of the product. Usually, by giving a suitable viscosity, the feeling of use and the adhesion during use are improved.

[0003] However, when a liquid composition containing a cationic surfactant having a predetermined viscosity is produced, there is a problem that the viscosity of the composition obtained varies depending on the lot of the raw material for mixing the liquid composition. There is a need for a technique that can maintain the viscosity of a cationic surfactant-containing liquid composition within a predetermined range without being affected by lots.

The present invention has been made in view of the above circumstances,
It is an object of the present invention to provide a method for controlling the viscosity of a cationic surfactant-containing liquid composition, wherein the viscosity of the composition can be controlled by means of compounding the components when producing the cationic surfactant-containing liquid composition. .

[0005]

Means for Solving the Problems and Embodiments of the Invention The present inventors have made intensive studies to achieve the above object, and as a result, when producing a liquid composition containing a cationic surfactant, When an O / W emulsion type liquid composition is produced by forming a liquid crystal structure composed of an oil phase containing an agent and an aqueous phase, and further adding an aqueous phase to invert the liquid phase, a nonionic interface is produced. The activator is divided or added at the time of forming the liquid crystal structure and subsequent steps to change the compounding ratio of the nonionic surfactant in each step, or to add the aqueous phase mixed at the time of forming the liquid crystal structure. The viscosity of the cationic surfactant-containing liquid composition can be controlled by changing the blending ratio of the cationic surfactant and the inorganic salt is blended within a predetermined range with the cationic surfactant-containing liquid composition. And knowledge to be able to control the viscosity of the cationic surfactant-containing liquid composition by also changing the adding and were able to complete the present invention.

That is, the present invention provides a method for producing a cationic surfactant-containing liquid composition by producing at least one of the following (1) to (3): Provided is a method for controlling the viscosity of a cationic surfactant-containing liquid composition, characterized by controlling the viscosity of the composition. (1) After a first aqueous phase is added to an oil phase containing a cationic surfactant to form a liquid crystal structure, a second aqueous phase is added to the liquid crystal structure, mixed, and phase-inverted. In producing the O / W emulsion type liquid composition containing a cationic surfactant, a predetermined amount of a nonionic surfactant is added to the composition to form a system for forming the liquid crystal structure and after the formation of the liquid crystal structure. And (2) adding a part of the aqueous phase to the oil phase containing the cationic surfactant to form a liquid crystal structure, and then forming the liquid crystal. The remaining part of the aqueous phase is added to the structure, mixed and phase-inverted to obtain O 2
In preparing the / W emulsion type liquid composition containing a cationic surfactant, the aqueous phase is formed so that the concentration of the cationic surfactant in the system for forming the liquid crystal structure is from 8 to 74% by weight. (3) when the above-mentioned cationic surfactant-containing liquid composition is produced, the inorganic salt is further reduced to a concentration of 0 in the composition when the above-mentioned cationic surfactant-containing liquid composition is produced.
A compounding means for controlling and compounding the compounding amount within a range of up to 3% by weight.

Hereinafter, the present invention will be described in more detail. The method for controlling the viscosity of a liquid composition containing a cationic surfactant according to the present invention comprises forming a liquid crystal structure comprising an oil phase and an aqueous phase containing a cationic surfactant. After that, when an O / W emulsion type liquid composition is produced by further adding an aqueous phase and inverting the phase, the viscosity of the liquid composition is not controlled by the composition but the liquid composition. The mixing means of (1) for controlling the mixing ratio of a predetermined amount of nonionic surfactant to be added to the liquid crystal structure at the time of forming the liquid crystal structure, and the formation of an aqueous phase liquid crystal structure used in producing the liquid composition The viscosity of the liquid composition is controlled by the blending means of (2), which controls the blending ratio between time and phase inversion, and the O / W produced by a method involving phase inversion in the production process. Type emuljo Liquid compositions, for example, hair care products such as hair rinse agents, hair treatment agents, cosmetics such as emulsions and creams, liquid detergents, products such as fiber treatment agents such as softeners, and liquid compositions used as product raw materials. The viscosity is controlled independently of the composition of the liquid composition. Further, the method for controlling the viscosity of the cationic surfactant-containing liquid composition of the present invention is characterized in that, when producing the above-mentioned cationic surfactant-containing liquid composition, the amount of the inorganic salt is controlled within a predetermined range and added. The viscosity of the liquid composition is controlled by the mixing means (3).

Here, the cationic surfactant of the present invention includes, for example, hair care products such as hair rinse agents and hair treatment agents, cosmetics such as emulsions and creams, liquid detergents,
If it is blended in a fiber treatment agent such as a softener,
Although the kind is not particularly limited, for example, from di- or mono-long-chain alkyl type quaternary ammonium salts, tertiary amine salts, imidazoline salts, imidazolinium salts, amino acid-based cationic surfactants represented by the following general formula One or more selected ones are suitably used.

[0009]

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In the above formula, R ¹ is an alkyl or alkenyl group having 10 to 25, preferably 14 to 24 carbon atoms;
R ² is an alkyl group having 1 to 3 carbon atoms, or 10 to 2 carbon atoms.
4, preferably 14-18 alkyl or alkenyl groups. Here, each of R ¹ and R ² may be unsubstituted, and —O—, —CONH—, —COO—
May be separated by an ester group or an amide group, or substituted with -OH or the like. R ³ and R ⁴ are an alkyl group or a hydroxyalkyl group having 1 to 4 carbon atoms, respectively, and X is a halogen atom or a monoalkyl sulfate group.

The saturated / unsaturated ratio of the long hydrocarbon chains (R ¹ and R ² ) in the above formula is not particularly limited.

As the cationic surfactant of the present invention, specifically, as the quaternary ammonium salt represented by the above general formula, for example, di-hardened tallow alkyl dimethyl ammonium chloride, di-tallow alkyl dimethyl ammonium bromide, dioleyl dimethyl ammonium Chloride,
Dipalmityl methyl hydroxyethyl ammonium methyl sulfate, distearyl methyl polyoxyethylene (average degree of polymerization 3 mol) ammonium chloride, diisostearyl dimethyl ammonium methyl sulfate, dieicosyl dimethyl ammonium chloride, dibehenyl methyl polyoxyethylene (average polymerization Degree 5 mol) ammonium chloride, dielsyldimethylammonium chloride, di [(2-dodecanoylamino)
Ethyl] dimethylammonium chloride, di [(2-
Stearoylamino) propyl] dimethylammonium ethyl sulfate, di (2-ethylpalmitoyl) hydroxyethylmethylammonium methylsulfate, trioleylmethylammonium chloride, dioleylmonostearylmethylammonium chloride,
Dioleyl monobehenylmethylammonium chloride, monooleyldiethylsylmethylammonium chloride, tristearylmethylammonium methylsulfate, methyl-1-tallowamidoethyl-2-tallowalkylimidazolinium methylsulfate, methyl-
Dissociation by other ester groups or amide groups such as 1-hexadecanoylamidoethyl-2-pentadecylimidazolinium chloride, ethyl-1-octadecenoylamidoethyl-2-heptadecenylimidazolinium ethyl sulfate Quaternary ammonium salts having a long-chain alkyl or alkenyl group, such as distearoyloxyethyldimethylammonium chloride, dioleoyloxyethyldimethylammonium chloride, dipalmitoyloxyethyldimethylammonium methylsulfate, distearoyloxyisopropyldimethylammonium Chloride, dioleoyloxybutyldimethylammonium chloride, dioleoyloxyisopropyldimethylammonium chloride, stearoyloxyethyl Trimethyl ammonium chloride, can be given oleoyl trimethyl ammonium chloride and the like. As an amino acid-based cationic surfactant, coconut oil fatty acid L-arginine ethyl-
DL-pyrrolidone carboxylic acid, 4-guanidinobutyl lauryl amide acetic acid and the like are exemplified, and tertiary amine salts are exemplified by distearyl methylamine hydrochloride, dioleylmethylamine hydrochloride, distearylmethylamine sulfate and the like. In the case of a tertiary amine salt, the alkyl chain is-
It may be divided by a functional group such as COO— and —CONH—. Examples of imidazoline salts include 1-octadecanoylaminoethyl-2-heptadecylimidazoline hydrochloride, 1-octadecenoylaminoethyl-2-heptadecenyl imidazoline hydrochloride, and the like. Tallowamidoethyl-2-tallowalkylimidazolinium methyl sulfate, methyl-1-hexadecanoylamidoethyl-2-pentadecylimidazolinium chloride, ethyl-1-octadecenoylamidoethyl-2-heptadecenylimidazo Linium ethyl sulfate is exemplified. In the case of the present invention, among these, di-hardened tallow alkyldimethylammonium chloride is sometimes more suitably used.

The amount of the cationic surfactant in the liquid composition of the present invention is 1 to 25% based on the whole composition.
(% By weight, hereinafter the same), preferably 3 to 20%, more preferably 4 to 15%. If the amount is too small, it may be difficult to form a liquid crystal structure and an emulsion when produced by the phase inversion method. If the amount is too large, the aging stability of the viscosity may be poor.

The oily phase of the present invention comprises the above cationic surfactant and an oily component.
Various types of oily components can be used according to the type of the liquid composition and the purpose. Examples of such oily components include products in various fields such as fiber treatment agents such as softeners, cosmetics, pharmaceuticals, and detergents. Hydrophobic oils can be used, but usually have the function of changing the texture of clothing, giving a moisturizing effect on the skin, nourishing the hair, giving an antibacterial / bactericidal effect, etc. Is preferably used. Specifically, for example, synthetic oils such as silicone oil, cyclic silicone, modified silicone, mineral oils such as liquid paraffin, liquid isoparaffin, paraffin wax, olive oil, palm oil, coconut oil, olive squalane, jojoba oil, soybean oil, rice bran oil , Cottonseed oil, corn oil, castor oil,
Vegetable oils such as carnauba wax and peanut oil; animal oils such as sharksqualane, lanolin, mink oil, tallow, lard, squid oil, and whale oil; fatty acids and fatty acid esters such as hexyl laurate, isopropyl palmitate, oleic acid, and stearic acid; More specific functions include oil-soluble antibacterial agents such as triclosan, hinokitiol, triclocarban, and isopropylmethylphenol, and oil-soluble preservatives such as butylparaben, propylparaben, benzoic acid, salicylic acid, and sorbic acid. Agent, dibutylhydroxytoluene, butylhydroxyaniso-
, Oil-soluble antioxidants such as tocopherol, oil-soluble fragrances such as linalool, citronellol, geraniol, geranyl acetate, and other oil-soluble UV absorbers,
Insect repellents, moisturizers and the like can be mentioned, and these can be used alone or in an appropriate combination of two or more.

The amount of the oily component in the oil phase is appropriately selected depending on the kind thereof, the purpose and use of the liquid composition, etc., but usually, 0.001 to 5 of the whole composition.
%, Particularly preferably 0.1 to 3%. If the amount of the oil component is too small, the effect of the oil component may not be sufficiently obtained, and if the amount of the oil component is too large, it is difficult to form the liquid crystal structure and the emulsion in the case of the phase inversion method. There are cases. The mixing ratio with the above-mentioned cationic surfactant is as follows: cationic surfactant: oily component (weight ratio)
= 2: 1 to 100: 1, preferably 4: 1 to 10: 1. If the mixing ratio of the oil component is too large, for example, when the liquid composition is an O / W emulsion type, the oil component In some cases, a vesicle composed of a cationic surfactant containing the compound may be broken.

The cationic surfactant-containing liquid composition of the present invention may be used together with the above-mentioned cationic surfactant in order to facilitate the formation of an emulsion with the above-mentioned cationic surfactant. Organic solvents such as alcohols and lower alcohols such as ethanol and isopropyl alcohol and additives such as fatty acid alkanolamines can be blended in usual amounts.

Next, as the aqueous phase of the present invention, not only water but also a dispersion stabilizer, a low-temperature stabilizer, a coloring matter and other various water-soluble active ingredients are added to water within a range not to impair the effects of the present invention. A solution in which an appropriate amount is dissolved can be mentioned. Specifically, polyacrylic acid, carboxymethylcellulose, carboxyvinyl polymer and the like are used as dispersion stabilizers, ethylene glycol, propylene glycol, glycerin and the like are used as low temperature stabilizers, and Acid Red 138 is used as a pigment.
Acid Blue 9, Acid Yellow 141, Reactive Blue, and other various water-soluble active ingredients include bactericides, antibacterial agents, antioxidants, ultraviolet absorbers, and fluorescent whitening agents.

In the mixing means (1) of the viscosity control method of the present invention, the first aqueous phase and the second aqueous phase may be composed of the same component. For example, the first aqueous phase may be a liquid crystal structure. And the second aqueous phase may be of a different composition, such as comprising an aqueous phase component suitable for the formation and stability of the emulsion.

The nonionic surfactant used for the viscosity control in the compounding means (1) of the viscosity control method of the present invention includes hair care products such as a hair rinse agent and a hair treatment agent.
If it can be blended with fiber treatment agents such as softeners,
The type of the nonionic surfactant is not particularly limited, and examples of such a nonionic surfactant include polyoxyethylene (EO5 to EO8).
0) Nonylphenyl ether, polyoxyethylene (E
O5-80) octyl phenyl ether, glycerin fatty acid (C10-C24) ester, polyoxyethylene (EO5-80) sorbitan fatty acid (C10-C2)
4) Ester, polyoxyethylene (EO5 to 80) alkyl (C10 to C24) ether, fatty acid (C10 to C24) polyethylene glycol (EO5 to 80)
And the like, and these can be used alone or in an appropriate combination of two or more. In the case of the present invention, among these, polyoxyethylene (EO1) is particularly preferable.
5-60) Nonylphenyl ether and the like are preferably used.

The amount of the nonionic surfactant in the liquid composition of the present invention is not particularly limited. However, considering the viscosity control efficiency, the weight ratio of the nonionic surfactant to the cationic surfactant is considered. And cationic surfactant: nonionic surfactant = 20: 1 to 3: 1, preferably 20: 1.
5 to 20: 3. If the amount of the nonionic surfactant is too small, the effect of controlling the viscosity may not be obtained. If the amount is too large, the vesicle structure (liposome) may be destroyed. Further, for the same reason, the blending amount with respect to the whole composition is 0.01 to 5%, preferably 0.05 to 4%, and more preferably 0.1 to 3%. The nonionic surfactant is used as one of water-soluble components arbitrarily compounded in the cationic surfactant-containing liquid composition whose viscosity is controlled by the compounding means (2) and the compounding means (3). You can also.

The inorganic salt used for viscosity control in the compounding means (3) of the viscosity control method of the present invention includes a hair rinse agent,
The type is not particularly limited as long as it can be blended in hair care products such as hair treatment agents, and fiber treatment agents such as softeners. Examples of such inorganic salts include sodium chloride, calcium chloride, and magnesium chloride. , Potassium chloride, ammonium chloride and the like, and these can be used alone or in an appropriate combination of two or more. In the case of the present invention, among these, sodium chloride, calcium chloride and the like are particularly preferably used.

The amount of the inorganic salt in the liquid composition of the present invention must be changed in the range of 0 to 3%, preferably 0.001 to 1% based on the whole composition. Within the above range, the viscosity control is excellent, but if the amount is too large, the liquid composition will separate into two layers. Here, when the blending amount of the inorganic salt is 0%, it is not necessary to change the viscosity of the composition by the blending means of (3) of the viscosity control method of the present invention, or by-products or impurities of other raw materials. In this case, the viscosity can be controlled by adjusting the amount of the inorganic salt brought into the composition, and it is not necessary to newly add an inorganic salt. For the same reason, the mixing ratio of the cationic surfactant to the cationic surfactant is 100: 1 to 5: 1, preferably 5: 1 by weight.
0: 1 to 10: 1.

The above-mentioned inorganic salt is used as one of water-soluble components arbitrarily compounded in the cationic surfactant-containing liquid composition whose viscosity is controlled by the compounding means (1) and (2). Can also be used.

The method for controlling the viscosity of the liquid composition of the present invention comprises, as described above, forming a liquid crystal structure composed of an oil phase and a part of an aqueous phase or a first aqueous phase, and then further forming a remaining aqueous phase or a second aqueous phase. When the O / W emulsion type liquid composition is prepared by adding two aqueous phases and inverting the phase, (1) a predetermined amount of a nonionic surfactant is added to the composition to form the liquid crystal structure. Blending means for controlling and blending the blend ratio of the system and the system in the step after the formation of the liquid crystal structure, (2) the aqueous phase forming the liquid crystal structure having a cationic surfactant concentration of 8 to 10%;
When producing the liquid composition containing the cationic surfactant containing the above-described liquid composition containing the cationic surfactant by controlling the compounding ratio in a range of 74% by weight, (3) the inorganic salt is further concentrated in the composition. The viscosity of the obtained liquid composition is controlled by a compounding means for controlling the compounding amount in the range of 0 to 3% by weight. In the present invention, the method for producing the liquid composition may be a batch type or a continuous type, and after the viscosity control, water and other components may be further added.

Here, when the above-mentioned cationic surfactant-containing liquid composition whose viscosity is controlled by the viscosity control method of the present invention is of the O / W emulsion type,
The method for producing the cationic surfactant-containing liquid composition (phase inversion method) is not particularly limited to the production conditions and the like.
Although it can be carried out under normal conditions, for example, it is preferable to manufacture under the following conditions.

When an O / W emulsion type is prepared as the cationic surfactant-containing liquid composition by the phase inversion method, the mixing ratio of the entire aqueous phase to the entire oil phase is determined by the composition of the oil phase and the liquid composition. The oil phase: water phase = 1: 19 ~
An amount of 2: 3 is preferable, and an aqueous phase (aqueous phase for a liquid crystal structure) to be mixed at the time of forming the liquid crystal structure, that is, the “first aqueous phase” in the mixing means of (1), and the mixing of (2) In the means, the mixing ratio of “part of the aqueous phase” to the entire oil phase is preferably such that the liquid crystal structure is formed immediately before the vesicle is formed from the viewpoint of the liquid crystal structure formation and the vesicle conversion ratio of the cationic surfactant. Oil phase: water phase for liquid crystal structure = 1: 1 by weight ratio
An amount of 1 to 1: 6 is preferred. On the other hand, an aqueous phase (aqueous phase for phase inversion) added to the liquid crystal structure, that is, (1)
The mixing ratio of the “second aqueous phase” in the mixing means of (1) and the “remainder of the aqueous phase” in the mixing means of (2) is usually (weight of oil) in consideration of the stability of the O / W emulsion. Phase + aqueous phase for liquid crystal structure): The amount of the aqueous phase for phase inversion = 1: 0.6 to 1: 4 is preferable. Therefore, in the case of the compounding means of (2),
It is desirable to control the mixing of the aqueous phase during the formation of the liquid crystal within the above range.

The temperature for forming the liquid crystal structure needs to be equal to or higher than the phase transition temperature (Tc) of the cationic surfactant. If the temperature at the time of forming the liquid crystal structure is lower than Tc, no liquid crystal structure is formed. The temperature difference between the temperature at the time of forming the liquid crystal structure and Tc is not particularly limited, and can be appropriately selected within a temperature range in which the liquid crystal structure can be formed. Is preferably 2 to 20 ° C., particularly about 2 to 10 ° C. higher than Tc.

When a liquid crystal structure is formed from the above system, the stirring device to be used is not particularly limited, and a conventionally used propeller, paddle mixer, turbine, homomixer or the like can be used. Considering that the viscosity of the liquid crystal structure increases as the liquid crystal structure is formed, for example, a line mixer, an azihomomixer, a kneader, a paddle mixer, a screw mixer, a spiral mixer, a Nauter mixer, a double helical ribbon mixer, a continuous It is desirable to be able to mix high-viscosity materials such as a kneader as a whole.
A combination of more than one kind may be used. The stirring conditions at this time should be within the normal range of these devices, and it is desirable to continue stirring until the liquid crystal structure is formed and the viscosity of the system increases.

Next, after the step of forming the liquid crystal structure (liquid crystal structure forming step), the liquid crystal structure and the aqueous phase for phase inversion are mixed to form an O / W emulsion type liquid composition. In this case, the mixing temperature may be lower than the Tc, but it is preferable to perform the mixing at a temperature higher than the Tc in consideration of the solidification of the cationic surfactant. The order of adding the liquid crystal structure and the aqueous phase for phase inversion is not particularly limited, and they may be added simultaneously, for example. The stirrer used in the phase inversion step is not particularly limited, and a normal stirrer can be used. For example, a line mixer, an azihomo mixer, a homomic line mill,
A stirrer capable of giving a certain degree of shearing force, such as a homomic line flow, a milder, and a disper mixer, is suitable, and these may be used alone or in an appropriate combination of two or more. The stirring conditions at this time are as follows:
It is desirable to perform the operation within the normal use range of these devices, and to stir until the whole becomes uniform.

In the present invention, after the phase inversion step,
That is, after the emulsion is formed, components can be appropriately compounded as needed, as long as the effects of the present invention are not hindered.

The viscosity control method of the present invention is applicable to the above (1) to (10) when a liquid composition containing an O / W emulsion type cationic surfactant is produced by the above phase inversion method.
When the cationic surfactant-containing liquid composition is produced by at least one or more means of the compounding means of (3) and a method other than the above-mentioned production method, the cation obtained as described above by the compounding means of (3) is used. It controls the viscosity of the surfactant-containing liquid composition.

Here, in the case of the compounding means of the above (1), the system for forming the liquid crystal structure and the liquid crystal structure are formed when a predetermined amount of the nonionic surfactant is compounded in the above-mentioned production method. In the subsequent step, that is, the phase inversion step and, as described above, the proportion of the components to the system in the step of appropriately mixing the components after the emulsion is formed as necessary is controlled. The size of vesicle (liposome) particles can be increased by adding the ionic surfactant in two or more portions during the formation of the liquid crystal structure and thereafter, or collectively during the formation of the liquid crystal structure or phase inversion. , Ie, by changing the apparent dispersoid (cationic surfactant) concentration, the viscosity can be controlled.

In this case, if the compounding ratio of the nonionic surfactant to be added to the system for forming the liquid crystal structure is increased, the viscosity of the obtained liquid composition can be increased. 100%, that is, the system for forming the liquid crystal structure does not contain the nonionic surfactant, and the whole amount of the nonionic surfactant to be blended is the system in the process after forming the liquid crystal structure, that is, the liquid crystal structure described above. It can be blended after the phase inversion system and the formation of the O / W emulsion, or conversely, the whole amount of the nonionic surfactant blended can be blended with the system forming the liquid crystal structure. The range in which the viscosity can be controlled by such a compounding means is not constant depending on the composition of the liquid composition, but hair care products such as hair rinse agents and hair treatment agents, cosmetics such as emulsions and creams, liquid detergents,
In the case of a composition used as a product such as a fiber treatment agent such as a softener, the viscosity at the 10th rotation at 30 rpm at 25 ° C. using a B-type viscometer is 10 to 30,000.
It can be controlled in the range of mPa · s.

The method of adding the nonionic surfactant to the system in each step is not particularly limited. For example, the nonionic surfactant may be added by dissolving it in the first aqueous phase or the second aqueous phase. May be added alone. In addition, when adding it by dissolving it in the second aqueous phase, the second aqueous phase can be added in portions during the phase inversion step.

Next, in the case of the compounding means of the above (2), the concentration of the cationic surfactant in the system for forming the liquid crystal structure is changed by adding the aqueous phase to be added when forming the liquid crystal structure in the manufacturing method. The viscosity is controlled by changing the ratio of the network structure between the vesicle body and the non-vesicle body by adjusting the blending ratio within the range of 8 to 74%, particularly 10 to 50%. Outside the above range, it is difficult to form a liquid crystal structure.

Such control is performed, for example, when the cationic surfactant concentration of the cationic surfactant-containing liquid composition is 1%.
If it is 20%, it can be usually carried out by controlling the mixing ratio of the aqueous phase for forming a liquid crystal structure within the range of 4 to 60% of the total aqueous phase.

In this case, the relationship between the mixing ratio of the aqueous phase for forming a liquid crystal structure and the viscosity of the obtained liquid composition is such that the mixing ratio of the aqueous phase for forming a liquid crystal structure is gradually increased within the above range. As the viscosity of the liquid composition increases, the viscosity gradually decreases with an increase in the mixing ratio of the aqueous phase up to a threshold viscosity appropriately determined by the type and concentration of the cationic surfactant, and thereafter , The viscosity gradually increases. Therefore, for example, when the viscosity of the liquid composition is plotted on the vertical axis and the mixing ratio of the aqueous phase for forming the liquid crystal structure is plotted on the horizontal axis, a substantially U-shaped curve is drawn.

The range in which the viscosity can be controlled by such a compounding means is not constant depending on the composition of the liquid composition. For example, hair care products such as hair rinse agents and hair treatment agents, cosmetics such as emulsions and creams, and liquid detergents In the case of a composition used as a product such as a fiber treatment agent such as a softener, the viscosity at the 10th rotation at 30 rpm using a B-type viscometer at 25 ° C. is 10 to 30,000 m
It can be controlled in the range of Pa · s.

In this mixing means, the above-mentioned aqueous phase for phase inversion (the remainder of the aqueous phase) may be added in portions in the phase inversion step.

In the compounding means (3), the method for producing the composition and the structure of the composition are particularly limited as long as the resulting cationic surfactant-containing liquid composition is an emulsion type liquid having a certain degree of viscosity. It may be used, for example, when producing a W / O emulsion type composition, and an oil phase containing a cationic surfactant is added to an aqueous phase containing an inorganic salt, followed by stirring. And emulsified to form an O / W emulsion or a W / O emulsion.
When the O / W emulsion type liquid composition is produced by the above-mentioned phase inversion method in the same manner as the blending means of (2), the viscosity of the obtained composition is controlled by blending the inorganic salt in a controlled amount. This is particularly useful for controlling

The method of adding the inorganic salt is not particularly limited. For example, the inorganic salt may be dissolved in water together with various water-soluble components in the blended components and blended in an appropriate step, or may be blended alone in an appropriate step. In particular, in the case of the above phase inversion method, when producing a composition having a cationic surfactant concentration of 9% or less in the cationic surfactant-containing liquid composition,
When the inorganic salt is added to a phase inversion system or a phase inversion aqueous phase,
Even if the amount of addition of the inorganic salt is about the same as the measurement error, the viscosity changes remarkably, and it becomes difficult to control the viscosity of the composition accurately. Therefore, the entire amount of the inorganic salt is mixed with the system for forming the liquid crystal structure. Then it is effective. On the other hand, when producing a composition having a cationic surfactant concentration of more than 9% in the cationic surfactant-containing liquid composition, a system for forming the liquid crystal structure and a system for inverting the liquid crystal structure are usually used. The viscosity can be adjusted with high precision even if it is divided and mixed at an arbitrary ratio. Particularly, when the purpose is to adjust the viscosity to a low viscosity of 1000 mPa · s or less, the total amount of the inorganic salt Alternatively, it is effective to add most of it to the phase inversion system or the phase inversion aqueous phase. As the method of adding the inorganic salt, it is preferable to add the inorganic salt by dissolving it in water or an aqueous phase for phase inversion in advance.

In this case, the relationship between the amount of the inorganic salt and the viscosity of the obtained liquid composition is such that when the amount of the inorganic salt is gradually increased within the above range, the liquid composition becomes Viscosity of the inorganic salt is relatively low,
The viscosity decreases relatively sharply with an increase in the amount of the inorganic salt, and thereafter, the decrease in the viscosity is gradual, and the water is reduced to a threshold viscosity appropriately determined by the type of surfactant or inorganic salt, viscosity, etc. The viscosity gradually decreases with an increase in the blending ratio of the phase, and thereafter, on the contrary, the viscosity gradually increases with an increase in the blending amount of the inorganic salt, and after a relatively high blending amount, The viscosity increases relatively sharply with an increase in the amount of the inorganic salt. Therefore, for example, when the viscosity of the liquid composition is plotted on the vertical axis and the amount of the inorganic salt is plotted on the horizontal axis, a mortar-shaped curve is drawn.

The range in which the viscosity can be controlled by such a compounding means is not fixed depending on the composition of the liquid composition, but for example, hair care products such as hair rinse agents and hair treatment agents, cosmetics such as emulsions and creams, and liquid detergents. In the case of a composition used as a product such as a fiber treatment agent such as a softener, the viscosity at the 10th rotation at 30 rpm using a B-type viscometer at 25 ° C. is 10 to 30,000 m
It can be controlled in the range of Pa · s.

As described above, according to the blending means (1) and (2), the cationic surfactant-containing liquid composition obtained without changing the composition of the cationic surfactant-containing liquid composition can be obtained. The viscosity can be controlled. According to the compounding means of the above (3), even if the viscosity of the cationic surfactant-containing liquid composition fluctuates due to the influence of an inorganic salt or the like introduced as an impurity of the compounded component, the compounded composition can be controlled. The viscosity of the resulting cationic surfactant-containing liquid composition can be controlled without changing it.

Here, in the case of the present invention, as described above, the viscosity of the liquid composition obtained by at least one or more compounding means of the above (1) to (3) is controlled. In view of the stability of the liquid composition over time, the compounding means (1) and (3) are preferable among the compounding means, and the compounding means (1) is more preferable.

[0046]

According to the method for controlling the viscosity of a liquid composition containing a cationic surfactant according to the present invention, the viscosity of the composition is controlled by the means for mixing the components when producing the liquid composition containing a cationic surfactant. In particular, in the case of the compounding means of the above (1) and (2), the viscosity of the obtained liquid composition can be controlled without changing the compounding composition of the liquid composition. The viscosity of the cationic surfactant-containing liquid composition can be kept within a predetermined range without being affected by the above.

Accordingly, the present invention provides, for example, a hair rinsing agent,
Method for controlling the viscosity of a cationic surfactant-containing liquid composition used as a product such as a hair care product such as a hair treatment agent, a cosmetic product such as an emulsion or a cream, a fiber detergent such as a liquid detergent or a softener, or as a raw material of a product It is suitable as.

[0048]

EXAMPLES Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples. In the following examples,% is% by weight.

Example 1 Dimethyl di-hardened tallow alkylammonium chloride and a fragrance were mixed at 45 ° C. using a paddle blade of an Ajihomomixer equipped with a paddle blade and a homomixer so as to have the following composition to form an oil phase. After preparation,
20% of purified water having the following composition and polyoxyethylene nonylphenyl ether (EO) having the following composition
= 40) was added and mixed in the mixing ratio shown in Table 1 to form a liquid crystal structure. Then, the homomixer was further rotated, and then 80% of the purified water and the remaining polyoxyethylene nonylphenyl ether (EO = 40) were further added. ) Was added, mixed and phase-inverted to obtain an O / W emulsion type cationic surfactant-containing liquid composition. The viscosity of each composition was measured at 25 rpm at 25 rpm at 30 rpm using a B-type viscometer (No. 2 rotor). The results are also shown in Table 1. <Composition> Dimethyl di-hardened tallow alkyl ammonium chloride 5.0% Polyoxyethylene nonylphenyl ether (EO = 40) 0.7% Fragrance (oil-soluble) 0.5% Purified water 93.8% Total 100.0%

[0050]

[Table 1]

Example 2 and Comparative Examples 1 and 2 Dimethyl di-hardened tallow alkylammonium chloride (oil phase) was uniformly dissolved at 85 ° C. using a paddle blade of an Ajihomo mixer so as to have the following composition. An aqueous phase prepared by dissolving polyoxyethylene nonylphenyl ether (EO = 40) in purified water in advance so as to have the following composition was added and mixed at the mixing ratio shown in Table 2 to form a liquid crystal structure. Turn the homomixer, and then add and mix the rest of the aqueous phase further to phase inversion.
A / W emulsion type cationic surfactant-containing liquid composition was obtained. The viscosity of each composition was measured using a B-type viscometer (No.
The viscosity at the 10th rotation was measured at 25 ° C. at 30 rpm using a 2 rotor). The results are also shown in Table 2. <Composition> Dimethyl di-hardened tallow alkyl ammonium chloride 5.0% Polyoxyethylene nonylphenyl ether (EO = 40) 0.7% Fragrance (oil-soluble) 0.5% Purified water 93.8% Total 100.0%

[0052]

[Table 2] *: The composition was not obtained due to gelation during phase inversion **: The composition was not obtained due to gelation in the liquid crystal structure forming step

[Examples 3 to 5 and Comparative Examples 3 and 4] Dimethyl di-hardened tallow alkylammonium chloride and a fragrance were mixed at 45 ° C. using the paddle blade of the above-mentioned azihomomixer so that the following composition was obtained, and the oil phase was obtained. After preparation, polyoxyethylene nonyl phenyl ether (EO = 40) and the total amount of sodium chloride in the compounding amount shown in Table 3 were dissolved in purified water in advance to a concentration of 10% by weight so as to have the following composition. Add the aqueous phase (equivalent to 20% of the total amount of purified water),
After mixing to form a liquid crystal structure, the homomixer is further rotated, and then the remainder of the aqueous phase (80% of the total amount of purified water)
Was added, mixed and phase-inverted to obtain the O / W emulsion type cationic surfactant-containing liquid compositions of Example 3 and Comparative Example 3. Further, an O / W emulsion type cationic surfactant-containing liquid composition of Example 4 was obtained in the same manner as in Example 3 except that calcium chloride was used instead of sodium chloride in Example 3 above.

On the other hand, purified water was mixed with polyoxyethylene nonyl phenyl ether (EO = 40) so as to have the following composition.
After dissolving sodium chloride having the compounding amount shown in Table 3 using a paddle stirrer to prepare an aqueous phase, dimethyldi-hardened tallow alkylammonium chloride and a flavor were previously mixed using a paddle stirrer so as to have the following composition. The oil phase prepared by mixing at 0 ° C was added and mixed to obtain the O / W emulsion type cationic surfactant-containing liquid composition of Example 5 and Comparative Example 4.

The viscosity of each composition was measured using a B-type viscometer (No. 2 rotor) at 30 rpm and the viscosity at the tenth rotation to 25.
Measured at ° C. The results are also shown in Table 3. <Composition> Dimethyl di-hardened tallow alkylammonium chloride 5.0% Polyoxyethylene nonyl phenyl ether (EO = 40) 0.7% Fragrance (oil-soluble) 0.5% Inorganic salt (type and blending amount shown in Table 3) purification Total water balance 100.0%

[0056]

[Table 3] *: Immediately after the preparation, the composition was in a gel state, and when left as it was, two-layer separation occurred, and no liquid composition was obtained.

[Example 6 and Comparative Example 5] An oil phase was prepared by mixing dimethyldi-hardened tallowalkylammonium chloride and a fragrance at 45 ° C using the paddle blade of the above-mentioned azihomomixer so as to have the following composition. An aqueous phase 20 prepared by dissolving polyoxyethylene nonyl phenyl ether (EO = 40) in purified water in advance to have the following composition:
%, And mixed to form a liquid crystal structure. Then, the homomixer is further rotated, and then the remaining portion of the aqueous phase and sodium chloride previously dissolved in purified water so as to have a blending amount shown in Table 4 are added. Was added, mixed, and phase-inverted to obtain O / W emulsion type cationic surfactant-containing liquid compositions of Example 6 and Comparative Example 5.

The viscosity of each composition was measured using a B-type viscometer (No. 2 rotor) at 30 rpm at the 10th rotation to 25.
Measured at ° C. The results are also shown in Table 4. <Composition> Dimethyl di-hardened tallow alkylammonium chloride 12.0% Polyoxyethylene nonylphenyl ether (EO = 40) 1.0% Fragrance (oil-soluble) 0.5% Sodium chloride (compounding amount shown in Table 4) Purified water Balance 100.0% in total

[0059]

[Table 4] *: Immediately after the preparation, the composition was in a gel state, and when left as it was, two-layer separation occurred, and no liquid composition was obtained.

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Claims (1)

[Claims] 1. When producing a cationic surfactant-containing liquid composition, the viscosity of the cationic surfactant-containing liquid composition is controlled by at least one compounding means selected from the following (1) to (3): A method for controlling the viscosity of a cationic surfactant-containing liquid composition, comprising: (1) After a first aqueous phase is added to an oil phase containing a cationic surfactant to form a liquid crystal structure, a second aqueous phase is added to the liquid crystal structure, mixed, and phase-inverted. In producing the O / W emulsion type liquid composition containing a cationic surfactant, a predetermined amount of a nonionic surfactant is added to the composition to form a system for forming the liquid crystal structure and after the formation of the liquid crystal structure. And (2) adding a part of the aqueous phase to the oil phase containing the cationic surfactant to form a liquid crystal structure, and then forming the liquid crystal. The remaining part of the aqueous phase is added to the structure, mixed and phase-inverted to obtain O 2
In preparing the / W emulsion type liquid composition containing a cationic surfactant, the aqueous phase is formed so that the concentration of the cationic surfactant in the system for forming the liquid crystal structure is from 8 to 74% by weight. (3) when the above-mentioned cationic surfactant-containing liquid composition is produced, the inorganic salt is further reduced to a concentration of 0 in the composition when the above-mentioned cationic surfactant-containing liquid composition is produced.
A compounding means for controlling and compounding the compounding amount within a range of up to 3% by weight.