JP3454991B2 - Pearl luster composition and method for producing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pearly luster composition used for increasing the added value of shampoos, rinses, body shampoos, liquid detergents and the like, and a method for producing the same. More specifically, the present invention relates to a pearly luster composition of plate crystals having a high viscosity, low viscosity, good dispersibility, and a small crystal grain size distribution, and a method for producing the same.

[0002]

2. Description of the Related Art Hitherto, there have been the following many techniques for pearly luster compositions exhibiting pearly luster. For example, Japanese Patent Publication No. 47-804 discloses a pearly luster former for clouding a liquid or pasty product, the composition of which contains a fatty acid glycol ester and a fatty acid monoalkylolamide. However, with this composition, the viscosity of the pearly luster-forming agent becomes high, the crystal grain size varies, the crystal form becomes non-uniform, the gloss quality is poor, and the dispersibility is poor.
Therefore, it is necessary to dilute with a large amount of water in advance, and a high-concentration gloss forming agent cannot be obtained. Then, a low concentration causes a problem that the use range is limited.

Further, Japanese Patent Application Laid-Open No. 56-71021 discloses a method for producing a pearlescent brightening agent. In order to eliminate the above-mentioned problems and obtain a brightening agent of high concentration, a fatty acid glycol ester is used. There is a description of a method in which after heating and melting a fatty acid dialkylolamide, water is added at a temperature below the melting point of the fatty acid glycol ester while cooling. However, in this method, water is not added above the melting point and it is in a substantially anhydrous state, and since it is added to water after cooling, the crystal grain size varies, the crystal form becomes non-uniform, and the gloss It will be of poor quality.

Further, JP-A-57-156409 and JP-A-57-156410 disclose a method for producing a high-concentration pearlescent agent dispersion, in which fatty acid diethanolamide is added to the pearling agent. Since the amount is large, the higher the concentration, the larger the amount of fatty acid diethanolamide, which limits the utilization range. Further, in this composition, the crystal grain size varies and the crystal form becomes non-uniform.

Japanese Patent Application Laid-Open No. 57-165308 discloses a method for producing a pearly luster agent dispersion liquid. As in this method, the pearly luster agent is solubilized in an aqueous surfactant solution at a high concentration. In this case, since it has a high viscosity (low fluidity) at room temperature, it needs to be diluted with an appropriate solvent in advance and used. Therefore, there is a drawback that the practical concentration becomes low due to dilution.

Further, in Japanese Patent Laid-Open No. 4-45843,
A method for producing a high-concentration pearlescent brightener dispersion is disclosed, in which a low-concentration fatty acid glycol ester dispersion is used as a crystal nucleus and crystal growth is performed to obtain high-concentration uniform particles. There is a description. However, a step of preparing a low-concentration fatty acid glycol ester dispersion, a step of adding and mixing this, and a aging time for crystal growth are required, which complicates the operation and reduces productivity. There is also a problem.

Further, Japanese Patent Laid-Open No. 6-182173 discloses a method for producing a pearlescent brightener dispersion using a fatty acid glycol ester and a surfactant. The crystals obtained are needle-shaped and are beautiful. Although it has a vivid gloss, it does not give a soft and calm gloss. In the conventional pearly luster composition, since "glossy texture" has not been emphasized so much, the present situation is that there are few variations in glossiness, but it is calm different from the vivid glossiness shown by needle crystals. The luster is also required to be developed depending on the application and consumer preference.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, the object of the present invention is to provide a high concentration, low viscosity, good dispersibility, a small grain size distribution of crystals, and a conventional gloss. To provide a pearly luster composition having a different moist and calm fine luster and a method for producing the same.

[0009]

Means for Solving the Problems As a result of intensive studies for solving the above problems, the present inventors have surprisingly added a glycolate as a raw material when producing a pearly luster composition. Then, it was found that a plate-shaped pearly luster composition can be obtained by quenching in the cooling step. Further, it has been found that such a pearly luster composition of plate-like crystals has a particularly beautiful appearance and a moist and calm luster, and has a texture different from that of conventional needle-like crystals. The present inventors have completed the present invention based on the above findings.

That is, the gist of the present invention is: (1) A pearly luster composition of plate crystals, which comprises the following components (A) to (E): (A) fatty acid glycol ester 20 to 60 % By weight (B) fatty acid monoalkylolamide 1-20% by weight (C) amphoteric surfactant or nonionic surfactant 1-20% by weight (D) glycolate at least 0.1% by weight (E) residual water Amount (2) The pearly luster composition according to (1), wherein the average value of the maximum diameter of each crystal divided by the minimum diameter is 1 to 3, (3) the following steps (i) and (ii) A method for producing a pearly luster composition of plate crystals according to the above (1) or (2), characterized by comprising at least: (i): (A) to (E) components, (A) component and ( B)
Mixing and emulsifying at a temperature equal to or higher than the melting point of the mixture of components, (ii): cooling the emulsion obtained in step (i) to a crystallization temperature or lower at an average cooling rate of 1 to 10 ° C./min. (4) The production method according to the above (3), wherein the step (ii) is performed in the following step, (ii): the emulsion obtained in the step (i) is supplied to a cylindrical casing, By cooling the casing with a jacket circumscribing it, the emulsion is cooled to a temperature below the crystallization temperature of 1 to 1.
The present invention relates to a step of cooling at an average cooling rate of 10 ° C./min to precipitate the component (A) on the inner wall of the casing and dispersing it while scraping it with a scraping blade.

[0011]

DETAILED DESCRIPTION OF THE INVENTION

1. Pearl Luster Composition The pearl luster composition of the present invention is characterized by containing the following components (A) to (E). (A) Fatty acid glycol ester 20 to 60% by weight (B) Fatty acid monoalkylolamide 1 to 20% by weight (C) Amphoteric surfactant or nonionic surfactant 1 to 20% by weight (D) Glycolate salt at least 0 0.1% by weight (E) residual amount of water The average particle size of the pearly luster composition of the present invention is not particularly limited, but is preferably 2 to 30 μm.

As the component (A), for example, the following general formula (I) YO-(-CH ₂ CH ₂ O-) _m -COR ₁ (I) (wherein R ₁ is a direct carbon number of 13 to 21) is used. Represents a chain or branched saturated or unsaturated hydrocarbon group, and Y represents a hydrogen atom or-
COR ₁ is shown, and m is a number of 1 to 3 and means the average number of added moles. ) The fatty acid glycol ester represented by this is mentioned.

R ₁ in the general formula (I) is not particularly limited as long as it is a group which forms a crystalline fatty acid glycol ester having a melting point of 50 ° C. or higher from the viewpoint of stability at high temperature, and the number of carbon atoms is 13 to 21 alkyl groups, alkenyl groups and the like can be mentioned. For example, pentadecyl group, heptadecyl group, henicosyl group and the like can be mentioned. Further, as the fatty acid glycol ester represented by the general formula (I),
Either a monocarboxylic acid ester or a dicarboxylic acid ester may be used.

Specific examples of the above fatty acid glycol ester include fatty acid monoethylene glycol such as ethylene glycol monostearate, ethylene glycol monopalmitate, ethylene glycol monoisostearate, ethylene glycol distearate and ethylene glycol dibehenate, and Examples thereof include diethylene glycol bodies and triethylene glycol bodies. Among these, ethylene glycol distearate, ethylene glycol monostearate and ethylene glycol dibehenate are preferable, and ethylene glycol distearate is particularly preferable.

Examples of the component (B) include the following general formula (II) R ₂ CO-NH-R ₃ OH (II) (wherein R ₂ is a saturated linear or branched chain having 7 to 17 carbon atoms). Or an unsaturated hydrocarbon group, and R ₃ represents an ethylene group or a propylene group.).

R ₂ in the general formula (II) is not particularly limited, and examples thereof include an alkyl group having 7 to 17 carbon atoms and an alkenyl group. For example, an undecyl group, a tridecyl group, a heptadecyl group, etc. are mentioned. Specific examples of R ₃ include an ethylene group, an n-propylene group, an isopropylene group and the like, but an ethylene group or an isopropylene group is preferable.

Examples of the above fatty acid monoalkylolamides include lauric acid monoethanolamide, lauric acid monopropanolamide, lauric acid monoisopropanolamide, myristic acid monoethanolamide, myristic acid monopropanolamide, myristic acid monoisopropanolamide, and palmitin. Acid monoethanolamide, palmitic acid monopropanolamide, palmitic acid monoisopropanolamide, stearic acid monoethanolamide, stearic acid monopropanolamide,
Stearic acid monoisopropanolamide, oleic acid monoethanolamide, oleic acid monopropanolamide, oleic acid monoisopropanolamide, coconut oil fatty acid monoethanolamide, coconut oil fatty acid monopropanolamide, coconut oil fatty acid monoisopropanolamide, palm oil vegetable fatty acid mono Examples include ethanolamide, palm oil fatty acid monopropanolamide, palm oil fatty acid monoisopropanolamide, and mixtures thereof. Of these, lauric acid monoethanolamide, palmitic acid monoethanolamide, stearic acid monoethanolamide, lauric acid monoisopropanolamide, and oleic acid monoisopropanolamide are preferable, and lauric acid monoethanolamide and lauric acid monoisopropanolamide are particularly preferable. .

Examples of the amphoteric surfactant or nonionic surfactant as the component (C) include, for example, alkyldimethylcarboxymethylammonium betaine, alkylcarboxymethylimidazolinium betaine, alkyldimethylamine oxide, alkylcarboxymethylhydroxyethyl imidazolium. Betaine, N- (N′-acylaminoalkyl) -N-hydroxylalkylaminocarboxylic acid salts and the like can be mentioned. Of these, lauryl hydroxysulfobetaine, lauryl dimethylamine oxide, and 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine are preferable.
As the component (C), the above surfactants may be used alone or in a mixture of two or more kinds.

Examples of the glycolate as the component (D) include sodium glycolate and potassium glycolate. Examples of water as the component (E) include ion-exchanged water.

The contents of the above components (A) to (E) in the pearly luster composition are shown below. The component (A) is 20 to 60% by weight in the pearly luster composition, preferably 20 to 60% by weight.
It is 50% by weight. A higher concentration is industrially preferable, and a low concentration limits the range of use.
It is preferably not less than 60% by weight, and more preferably not more than 60% by weight from the viewpoint of suppressing deterioration of dispersibility due to high viscosity.
The component (B) is 1 to 20% by weight in the composition, and the component (C) is
Ingredients are also 1 to 20% by weight in the composition. Where (B)
The preferred range of the component and the component (C) is 1 to 20% by weight in the composition, and the sum of the components (B) and (C) is 5 to 30% by weight in the composition. Here, the sum of both components is preferably 5% by weight or more from the viewpoint of suppressing the deterioration of the appearance due to the excessively large particle size at the time of emulsification, and from the viewpoint of further widening the range of use and the appearance due to the particle size becoming too small. From the viewpoint of suppressing deterioration, it is preferably 30% by weight or less.

The component (D) is at least 0.1 in the composition.
%, Preferably 0.15 to 1.0% by weight, and more preferably 0.15 to 0.75% by weight. It is preferably 0.1% by weight or more from the viewpoint of obtaining a plate-like crystal having a small crystal grain size distribution and 1.0% by weight or less from the viewpoint of widening the range of use. The component (E) is the remaining amount in the composition.

The pearly luster composition of the present invention has the above (A)
It is characterized by containing the components (E) to (E), but may further contain a viscosity reducing agent of the component (F) or a crystallization agent of the component (G). As the thinning agent for the component (F),
For example, potassium chloride, ethylenediaminetetraacetic acid disodium salt, polyethylene glycol, methacrylic acid ester polymer, sodium malate, sodium thionate,
Propylene glycol, butylene glycol, hexylene glycol, glyceryl trioctanoate, glyceryl monostearate, triglyceride 2-ethylhexanoate, isopropyl myristate, isopropyl palmitate, octyl palmitate, butyl stearate,
Examples include polyoxyethylene hydrogenated castor oil, ethanol and the like. Of these, propylene glycol, 2-ethylhexanoic acid triglyceride, isopropyl myristate, isopropyl palmitate, and ethanol are preferable.

The content of the thinning agent is 0.01 to 1 in the composition.
5.0% by weight is preferable, and 0.01 to 5.0% by weight is more preferable. From the viewpoint of reducing the viscosity of the present composition, 0.01% by weight or more is preferable, and from the viewpoint of not affecting the particle diameter, particle shape and Cv value, 15.0% by weight or less is preferable.

Examples of the crystallization agent of the component (G) include sodium sulfate, sodium acetate, ammonium chloride, calcium acetate, citric acid, sodium chloride, succinic acid,
Examples thereof include calcium chloride, oxalic acid, potassium chloride, tartaric acid, sodium citrate, sodium benzoate and the like. Of these, sodium chloride and potassium chloride are preferable. The content of the crystallization agent is 0.01-10.
0 wt% is preferable, and 0.01 to 5.0 wt% is more preferable. From the viewpoint of reducing the Cv value, 0.01% by weight or more is preferable, and from the viewpoint of not affecting the particle diameter and particle shape, 10.0% by weight or less is preferable.

The pearly luster composition of the present invention is characterized in that the crystal shape is plate-like. As used herein, the term "plate-like" refers to a crystal having an average value of 1 to 3 obtained by dividing the maximum diameter of each crystal by the minimum diameter. It should be noted that those having a value exceeding 3 are “needle-shaped”. Therefore, the pearly luster composition of the present invention is plate-like, that is, the average value of the maximum diameters of the individual crystals divided by the minimum diameter is 1 to 3, and more preferably 1 to 2. . The average value is preferably 3 or less from the viewpoint of differentiating from the conventional appearance and obtaining one having an unprecedented appearance. The pearly luster composition consisting of such plate-like crystals has a particularly beautiful appearance and has a moist and calm fine texture, and has a texture different from that of conventional needle-like crystals. It is preferably used as a liquid cleaning agent.

2. About the manufacturing method of a pearly luster composition The above-mentioned pearly luster composition of this invention can be conveniently manufactured, for example using the manufacturing method of this invention demonstrated below. The production method of the present invention comprises: (i): (A) to (E) components, (A) component and (B)
Mixing and emulsifying at a temperature equal to or higher than the melting point of the mixture of components, (ii): cooling the emulsion obtained in step (i) to a crystallization temperature or lower at an average cooling rate of 1 to 10 ° C./min. , Are included.

In the step (i), the components (A) to (E) are added,
This is a step of mixing and emulsifying at a temperature equal to or higher than the melting point of the mixture of the components (A) and (B). Here, the melting point of the component (A) varies depending on the component used, but is, for example, 50 to
It is about 70 ° C. The melting point of the component (B) also varies depending on the component used, but is, for example, about 50 to 80 ° C. The temperature above the melting point is not particularly limited,
It is preferably 5 to 30 ° C, more preferably 5 to 25 ° C higher than the melting point of the mixture of the components (A) and (B). The emulsification by mixing is carried out by a conventional method using a stirrer or the like. Further, the component (F) or the component (G) may be added during this mixing. When mixing (A)
In the pearly luster composition shown above, the amount of each component (E) blended is such that the change in the ratio of components (A) to (E) is negligible even when water evaporation due to heating is taken into consideration. The same as the content of. The same applies to the component (F) and the component (G).

The emulsion thus obtained must be kept at a temperature above the melting point so that any component does not precipitate before reaching the next step. Furthermore, it is desirable to keep stirring so that the emulsion does not separate. The emulsion may be prepared batchwise each time, or may be prepared by continuously mixing and heating the components.

The step (ii) is a step of rapidly cooling the emulsion obtained in the step (i) to a crystallization temperature or lower. However, the average cooling rate is 1 to 10 ° C./min. More preferably, it is 2 to 8 ° C / min. The rate of 1 ° C./min or more is preferable from the viewpoint of obtaining plate crystals, and the rate of 10 ° C./min or less is preferable from the viewpoint of preventing the plate crystals from becoming too small. The crystallization temperature in the present specification is a temperature at which a fatty acid glycol ester is precipitated, and since the specific temperature varies depending on the type of fatty acid glycol ester, the type and amount of various components, etc. It is about 30 to 60 ° C. Therefore, 10 to 3
It is preferable to cool to a temperature 0 ° C lower. As described above, the emulsion obtained in step (i) is rapidly cooled and crystallized to obtain the pearly luster composition (dispersed liquid) of the plate-like crystal of the present invention.

In the step (ii), it is preferable to use a heat exchanger as shown in FIG. 1, for example, because continuous cooling can be performed while maintaining a predetermined average cooling rate. In this case, in the step (ii), the emulsion obtained in the step (i) is supplied to a cylindrical casing, and the casing is cooled by a jacket circumscribing the casing to bring the emulsion to a crystallization temperature of 1 to 10 ° C. or lower. Cooling at an average cooling rate of / min to precipitate the component (A) on the inner wall of the casing,
This is a step of dispersing while scraping this with a scraping blade. In addition, the average cooling rate can be set by appropriately adjusting the flow rate of the emulsion, the temperature of the refrigerant in the jacket, etc. according to the volume of the heat exchanger used. Specific examples of such a heat exchanger include Contherm manufactured by Alfa Laval Co., an onlator manufactured by Sakura Seisakusho Co., Ltd., and a botter. Hereinafter, an example of the apparatus will be described in more detail with reference to FIG.

The emulsion is supplied from the lower inlet 5 of the heat exchanger and agitated by the scraping blade 3 rotated by the motor 1 while passing through the casing 2. On the other hand, the jacket 4 that is externally mounted on the casing 2 is supplied with the refrigerant from the refrigerant inlet 7 and discharged from the refrigerant outlet 8. The casing 2 cooled by the jacket 4 further cools the emulsion on the inner wall of the casing 2 to deposit the fatty acid glycol ester. Since the precipitate is scraped off by the rotating scraping blade 3, it is possible to maintain a high heat transfer effect by the turbulent flow effect due to stirring without being deposited on the inner wall. For this reason, the cooling rate can be increased to a predetermined degree, and as a result, the productivity is improved, the crystal shape becomes a plate shape, and the temperature distribution of the solution becomes uniform, so that the crystal grain size distribution Becomes sharp (Cv value is 0.8 or less), and the pearl luster is improved. Here, the Cv value is a scale of the particle size distribution represented by the following equation, and the smaller the Cv value is, the narrower the particle size distribution is.

Cv = σ / Dp Dp: volume-based average particle size (μm) σ: standard deviation of volume distribution of particle size (μm)

The average particle size of the obtained crystals is preferably 5 to 30 μm in order to develop pearl luster. Since this average particle diameter changes depending on the composition of the emulsion, the peripheral speed of the scraping blade, etc., these conditions may be appropriately set according to the desired average particle diameter.

Further, since the crystals obtained by the strong shearing force by the scraping blade are sufficiently dispersed, it is possible to reduce the viscosity of the obtained pearly luster composition dispersion liquid, and there is an advantage that the handling is easy. . The peripheral speed of the scraping blade is preferably 1 to 10 m / min, more preferably 1
~ 5 m / min. It is preferably 1 m / min or more from the viewpoint of uniform cooling by scraping and renewing the cooling surface, and preferably 10 m / min or less from the viewpoint of reducing the mechanical load. Here, the peripheral speed is expressed by the following equation.

Peripheral speed = π · N / 60 · D π: Pi N: Number of rotations of scraping blade (rpm) D: Diameter of scraping blade (m)

The structure of the scraping blade is such that a flexible blade made of Teflon or the like is in contact with the heat transfer surface, or the scraping blade receives centrifugal force due to rotation and liquid pressure of the emulsion. A movable object whose edge is pressed against the heat transfer surface can be preferably used. While passing through the casing, the emulsion is cooled by the cooling medium of the outer jacket and exits from the upper outlet 6. The outlet temperature is preferably lower than 40 ° C., more preferably 30 ° C. or lower. At 40 ° C or higher, the obtained crystals are soft and agglomeration occurs to deteriorate the pearly luster. Further, the temperature of the cooling medium or the supply rate of the solution can be changed, or two or more heat exchangers can be connected in series to form a multi-stage, and the cooling patterns can be arbitrarily controlled by using the cooling media having different temperatures. It is possible.
The heat exchanger may be installed vertically or horizontally.

[0037]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. The results of the examples are those measured by the following evaluation methods.

(1) Appearance The sample was placed in a transparent glass container having a volume of 100 mL, and the appearance of pearl luster was observed with the naked eye. If the sample contained air bubbles, it was defoamed by placing it in a centrifuge. ⊚: The pearl luster is uniform and has a fine, moist and lustrous texture. ○ = The pearl luster is uniform. × = Turbid, emulsion-like or non-uniform pearl luster.

(2) The sample used for the viscosity (1) test was placed in a constant temperature bath at 30 ° C., the temperature of the sample was kept at 30 ° C., and the viscosity (cp) was measured with a B type viscometer (manufactured by Tokyo Keiki Co., Ltd.). Was measured.

(3) Stability 1. High temperature stability Put the sample in a transparent glass container and seal it at high temperature (50 ℃)
After storing for 1 month in a constant temperature bath, the presence or absence of separation of the sample and the presence or absence of aggregation of the pearly luster composition were visually observed. ○ = no abnormalities such as separation, aggregation of pearly luster composition, disappearance of pearly luster, etc. x = abnormalities of separation, aggregation of pearly luster composition, disappearance of pearly luster are observed 2. Low temperature stability Put the sample in a transparent glass container and seal it at low temperature (-5 ° C).
After storing for 1 month in a thermostat, the sample was visually observed for separation and solidification. ○ = Liquid with no separation or solidification × = Abnormality such as separation or solidification

In the evaluation results described below, the ones with ○ in both high temperature stability and low temperature stability were evaluated as ○,
In any case, those having a rating of x and those having a rating of x were rated as x.

(4) Dispersible pearly luster composition A sample was added to and mixed with a 25% by weight aqueous solution of triethanolamine polyoxyethylene lauryl ether sulfate so that the concentration of the composition was 2% by weight. The dispersibility at this time was observed. ◎: Very good ○: Excellent Δ: Somewhat inferior ×: Inferior

(5) Average particle size 10 mL of the sample was diluted with water to 100 mL, and then measured using a laser diffraction particle size distribution analyzer LA-700 manufactured by Horiba Ltd.

(6) Cv value Cv = σ / Dp Dp: volume-based average particle size (μm) σ: standard deviation (μm) of volume distribution of particle size, which is a measure of particle size distribution, and the smaller the particle size, the smaller the particle size. It shows that the diameter distribution is narrow.

(7) Average value of the maximum diameter of each crystal divided by the minimum diameter A value obtained by dividing the maximum diameter of each crystal by the minimum diameter was determined and the average value was calculated. Specifically, the pearly luster dispersion was diluted and then photographed with an optical microscope for measurement. The average value was calculated from the measured values for 30 crystals.

Example 1 Components (A) to (E) were prepared so as to have the compositions (% by weight) shown in Tables 1 and 2 and heated to 80 ° C. to obtain a uniform emulsion, which had an inner diameter of 152. 4 mm, height 563 mm 0.2
The scrape heat exchanger 6 × 3 type manufactured by Alfa Laval Co. having a heat transfer area of 7 m ² was continuously supplied at the flow rates shown in Tables 1 and 2. The peripheral velocities of the scraping blades were set to those shown in Tables 1 and 2 while stirring, and the pearly luster was obtained by cooling with the cooling water passed through the jacket so that the liquid temperature at the outlet would be 30 ° C. A composition is obtained, and each of the compositions (1) to
(12). The main conditions and results are shown in Tables 1 and 2.

[0047]

[Table 1]

[0048]

[Table 2]

From the above results, all of the compositions (1) to (7) of the present invention have good appearance, dispersibility and stability, low viscosity, small average particle size and small particle size distribution. It was a plate-like crystal. On the other hand, JP-A-6-18
Obtained by a method according to the method described in JP 2173 (not containing sodium glycolate)
In all, the obtained crystals were needle-shaped (compositions (8) to (11)). A photograph showing the crystal structure of composition 4 is shown in FIG. 2, and a photograph showing the crystal structure of composition 8 is shown in FIG. Further, the composition in which the content of the component (B) or the component (C) was out of the predetermined range had poor appearance and dispersibility, and had high viscosity and poor quality (compositions (10) and (11)). ). Further, the composition obtained by gradual cooling having an average cooling rate smaller than the predetermined range had needle-like crystals (composition 12). When the gloss textures of the respective compositions were compared at the time of the appearance inspection, the compositions (1) to (7) had a soft and fine texture, and the compositions (8) to ( 1
2) had a shimmering, bright luster. This difference in the texture of the gloss is considered to be due to the fact that the obtained crystals are plate-shaped.

[0050]

EFFECT OF THE INVENTION The pearly luster composition of the present invention has a high concentration, low viscosity, good dispersibility, a small grain size distribution of crystals, and a gloss different in texture from conventional gloss. The pearly luster composition can be produced by the method of the present invention.

[Brief description of drawings]

FIG. 1 is a cross-sectional view and a plan view of a heat exchanger used in the present invention.

FIG. 2 is a photograph showing the crystal structure of Composition 4.

FIG. 3 is a photograph showing the crystal structure of Composition 8.

[Explanation of symbols]

1 motor 2 casing 3 scraping blade 4 jacket 5 Solution inlet 6 product exit 7 Refrigerant inlet 8 Refrigerant outlet

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI C11D 3/20 C11D 3/20 3/26 3/26 3/32 3/32 (56) Reference JP-A-8-231985 ( JP, A) JP 6-263615 (JP, A) JP 6-182173 (JP, A) JP 57-51799 (JP, A) JP 47-804 (JP, B1) JP Flat 6-504781 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C11D 3/42 C11D 3/20 C11D 3/26 C11D 3/32 A61K 7/075 A61K 7/08 A61K 7/50 B01J 13/00 Patent file (PATOLIS) JISST file (JOIS) CAPLUS (STN)

Claims (4)

(57) [Claims] 1. A pearly luster composition of plate crystals, which contains the following components (A) to (E). (A) Fatty acid glycol ester 20 to 60% by weight (B) Fatty acid monoalkylolamide 1 to 20% by weight (C) Amphoteric surfactant or nonionic surfactant 1 to 20% by weight (D) Glycolate salt at least 0 1% by weight (E) Water remaining amount 2. The pearly luster composition according to claim 1, wherein an average value of values obtained by dividing a maximum diameter of each crystal by a minimum diameter is 1 to 3. 3. The method for producing a pearly luster composition of plate crystals according to claim 1 or 2, which comprises at least the following steps (i) and (ii): (I): The components (A) to (E) are replaced with the components (A) and (B).
Mixing and emulsifying at a temperature equal to or higher than the melting point of the mixture of components, (ii): cooling the emulsion obtained in step (i) to a crystallization temperature or lower at an average cooling rate of 1 to 10 ° C./min. , 4. The manufacturing method according to claim 3, wherein step (ii) is performed in the following steps. (Ii): The emulsion obtained in the step (i) is supplied to a cylindrical casing, and the casing is cooled by a jacket circumscribing the emulsion to keep the emulsion at a crystallization temperature of 1 to 1 or less.
A step of cooling at an average cooling rate of 10 ° C./min to precipitate the component (A) on the inner wall of the casing and dispersing it while scraping it with a scraping blade;