KR101466649B1 - UV protecting cosmetic composition with good stability and texture using water in silicone type emulsion as a thickener - Google Patents

Abstract

The present invention provides a cosmetic composition for UV-screening in water (oil-in-water) comprising: (i) a thickener in the form of a water-in-oil type for the entire composition 1-10 weight%; And (ii) 1-10% by weight of a silicone emollient for the entire composition. The water-in-oil type thickening agent contained in the cosmetic composition for protecting ultraviolet rays of the present invention has a shape in which water and a water-soluble thickening agent are dissolved in silicone, so that even if a large amount of silicon is used, In the case of type emulsion formulation, as the phase is changed, the foreign water phase is increased like a gel, and a large amount of silicone is trapped and stabilized in the incremental gel matrix, thereby eliminating the feeling of use of the existing ultraviolet screening agent, and using a large amount of silicone emollient, And the like.

Description

[0001] The present invention relates to a UV-protecting cosmetic composition comprising a water-soluble thickener and a water-in-silicone thickener as an emulsifier,

The present invention relates to an emulsifier comprising water and a water-soluble thickening agent as an emulsifier, which enhances the stability of the emulsion through the enhancement of the emulsion during the water-in-oil emulsifier type, and enables the use of a large amount of silicone emollients, The present invention relates to a cosmetic composition for use in cosmetics, and more particularly, to a cosmetic composition for use in cosmetics, which, unlike a general single water-soluble thickener, blends the thickening agent with a thickening agent in the form of a water- It is in the form of a water-in-water type in which water containing water is present.

Since the water-in-oil type thickening agent has a shape in which the water and the water-soluble thickening agent are released in the silicone, even when a large amount of silicon is used, the stability of the water-in-water type formulation is not nutritious, The present invention relates to a cosmetic composition for ultraviolet ray shielding which enhances the feel by using a breathable silicone emollient and eliminating the feeling of use which a conventional ultraviolet screening agent possesses as a form in which a foreign body water phase is increased like a gel and a large amount of silicon is confined and stabilized in the increased gel matrix to be.

Excessive exposure of the skin to sunlight causes skin damage and skin disorders such as scaling of the stratum corneum, changes in skin texture, and severe skin cancer. Excessive or chronic exposure of the skin also promotes skin aging. In order to prevent such skin troubles, a cosmetic composition for protecting ultraviolet rays containing a certain amount of safe and effective ultraviolet (UV) blocking agent has been used.

Currently, the UV-screening agents used in the cosmetics industry can be divided into organic UV-blocking agents and inorganic UV-blocking agents. Most UV protection products, including organic or inorganic sunscreens, absorb or reflect ultraviolet light and are trying to take advantage of both to effectively block ultraviolet light through the use of blends.

Since exposure to ultraviolet light is inevitable in the daily life of the general public, regular use of sunscreen agents may be an essential factor. However, the feeling of greasy feeling by the use of such ultraviolet screening agent and the heavy lengthening through the use of the inorganic ultraviolet screening agent are difficult to feel while using modern sunscreen agents. Therefore, researchers are making a lot of efforts to improve this postural control and usability, and the following methods are used in such efforts.

(a) Reduction of sunscreen use by ultraviolet light booster

(b) surface modification that encapsulates or forms a complex on a particular material

Although the use of the above process has been introduced to reduce the amount of ultraviolet screening agent used on the feeling of use of the product and to improve the appearance of the skin by modifying the surface of the product, the unique feeling of use of the ultraviolet screening agent is insufficient.

Korean Patent No. 10-1002866 (entitled UV-ray cosmetic composition in the form of a water-in-oil emulsion) and 10-0402485 (entitled UV-blocking cosmetic composition in the form of a water-in-oil type emulsion containing powder) .

In general, the form of the composition for emulsifying cosmetic composition is largely divided into oil-in-water (O / W) emulsified type and water-in-oil (W / O) emulsified type. The water-in-oil (W / O) emulsified type has excellent properties of toilet paper and water resistance, but it has a disadvantage in that it gives stress to the skin due to stickiness, oiliness, waxiness, and poor feeling such as spreadability and spreadability. The oil-in-water (O / W) emulsified type is advantageous in soft feeling and soft feeling. In the case of the above-mentioned patent, the disadvantages of the water-in-oil type cosmetic composition and oil- But it was not intended to directly improve the feeling of use due to the large use of organic or inorganic sunscreen agents.

Accordingly, in order to solve the above-described problems, the inventors of the present invention have made it possible to increase the stability of the emulsion and to use a large amount of silicone emollient through water-in-silicone thickening agent, A cosmetic composition having remarkably improved feeling of use was obtained even though it contained a large amount of ultraviolet screening agent.

Numerous papers and patent documents are referenced and cited throughout this specification. The disclosures of the cited papers and patent documents are incorporated herein by reference in their entirety to better understand the state of the art to which the present invention pertains and the content of the present invention.

The present inventors have made intensive efforts to improve the feeling of use of conventional cosmetic compositions for ultraviolet ray shielding and greasy feeling by using a lot of inorganic sunscreen agents. As a result, when a cosmetic composition for underwater type ultraviolet ray shielding contains water and a water-soluble thickening agent as a thickening agent, it is possible to use a large amount of silicone, and in the emulsified oil-in-water formulations, , And helps to improve the sensation of use, thus completing the present invention.

Accordingly, the present invention provides a UV-blocking cosmetic composition comprising a water-in-oil type thickening agent.

The present invention also provides a process for producing the cosmetic composition for blocking ultraviolet rays.

The present invention provides a cosmetic composition for underwater (oil-in-water) ultraviolet screening.

The present inventors have made intensive efforts to improve the feeling of use of conventional cosmetic compositions for ultraviolet ray shielding and greasy feeling by using a lot of inorganic sunscreen agents. As a result, when a cosmetic composition for underwater type ultraviolet ray shielding contains water and a water-soluble thickening agent as a thickening agent, it is possible to use a large amount of silicone, and in the emulsified oil-in-water formulations, , Helping to improve feelings.

According to one aspect of the present invention, the present invention provides a cosmetic composition for protecting against ultraviolet rays in water (oil-in-water) comprising:

(a) 1-10% by weight of a thickener in the form of a water-in-oil type for the entire composition; And

(b) 1-10% by weight of Silicone Emollient for the total composition.

As used herein, the term "water-in-oil type" refers to an emulsion in which oil droplets are dispersed in water and is also referred to as an o / w type emulsion. A representative example is milk, mayonnaise, vanishing cream, and the like, which is a corresponding word in the following water-in-oil type.

As used herein, the term "water-in-oil type" refers to an emulsion (emulsion) or emulsion (emulsion) in which the water is dispersed as fine particles in oil and emulsified.

As used herein, the term " viscosity enhancer " refers to a polymer compound added to form the viscosity of the product or to increase the viscosity of the product. There are natural polymer compounds, semisynthetic polymer compounds and synthetic polymer compounds in the type of thickener.

According to a preferred embodiment of the present invention, the thickener in the form of a water-in-oil type is selected from the group consisting of (a) dimethicone: 1-20 wt%; (b) cyclopentasiloxane: 1-10% by weight; (c) sodium polyacrylate: 1-30 wt%; (d) trideceth-6: 1-10% by weight; (e) Pigment / Pigment-18/18 Dimethicone: 1-5% by weight; And (f) 10 to 40% by weight of purified water, most preferably (a) dimethicone: 19% by weight; (b) 9% by weight cyclopentasiloxane; (c) 26% by weight sodium polyacrylate; (d) trideceth-6: 6% by weight; (e) Phage / Phospho-18/18 Dimethicone: 1% by weight; And (f) purified water: 39% by weight.

According to a preferred embodiment of the present invention, the silicone emollient can comprise dimethicone, cyclopentasiloxane or caprylyl methicone and dimethicone / vinyl dimethicone crosspolymer in a ratio of 1: 1-10: 1-10 , More preferably in a ratio of 1: 1-5: 1-5, and most preferably in a ratio of 1: 2: 2.

Dimethicone used for the silicone emollient is different from dimethicone used for the water-in-oil type thickening agent. The dimethicone used for the water-in-oil type thickening agent is used for the purpose of increasing the use of the silicone emollient. However, Dimethicone is used as an antifoaming agent.

According to a preferred embodiment of the present invention, dimethicone as defoamer used in the silicone emollient can preferably exhibit the following characteristics:

(a) viscosity: 100-100,000 m 2 / s (25 ° C); And

(b) Specific gravity: 0.80 - 1.30 (25 캜).

In the present invention, the use of the water-in-oil type thickening agent and the silicone emollient is a very important component for improving the greasy feeling and the stiff lustering through the use of the inorganic sunscreen agent. Because the water-in-oil type thickening agent has a shape in which water and a water-soluble thickening agent are dissolved in silicon as shown in FIG. 2, even if a large amount of silicon is used, it does not nourish the stability of an underwater type formulation. As shown in FIG. 3, when the foreign body is inversion, the foreign water phase is increased like a gel, and a large amount of silicon is trapped and stabilized in the increased gel matrix. As a result, the feeling of use of the conventional ultraviolet screening agent is eliminated, and a breathable silicone emollient is used. It is possible to promote.

More particularly, the water-in-oil thickener is a blended emulsifiable gradual mixture of sodium polyacrylate, purified water, phage / lipid-18/18 dimethicone, dimethicone, cyclopentasiloxane and trideceth- And has the characteristic of being in the form of a water-in-water type containing purified water and sodium polyacrylate on silicone composed of dimethicone, cyclopentasiloxane, trideceth-6 and phage / piperidine-18/18 dimethicone have. In this emulsion, the sodium polyacrylate dispersed in silicon during mixing and emulsification of the oil phase and the water phase is phase inversion by Tridesce-6, The silicone that surrounds the trauma of the incremental deflagration has a mechanism that is trapped stably in an aqueous phase, that is, a gel, by sodium polyacrylate. Actually, FIG. 4 shows a trapped oily phase on the gel of the water phase. By using a supplementary emulsifier such as cetearyl alcohol to be described later, it is possible to keep the oil-type oil image more stably and to effectively block the ultraviolet rays by using a sunscreen agent, and to provide a smooth, It can be replaced.

According to a preferred embodiment of the present invention, the ultraviolet barrier cosmetic composition may further comprise the following auxiliary emulsifier and ultraviolet screening agent.

The auxiliary emulsifier may comprise, relative to the total composition, preferably from 0.1 to 5% by weight of at least one auxiliary emulsifier selected from the group consisting of polysorbate, cetearyl alcohol, dicapryl carbonate and behenyl alcohol, More preferably from 0.2 to 3% by weight, and most preferably from 0.5 to 2% by weight.

The ultraviolet screening agent preferably contains at least one ultraviolet screening agent selected from the group consisting of ethylhexyl methoxycinnamate, ethylhexylsalicylate, isoamyl P-methoxy cinnamate, preferably 1-20 wt% , More preferably from 3 to 18 wt%, and most preferably from 7 to 15 wt%.

According to another aspect of the present invention, the present invention provides a method for preparing a cosmetic composition for underwater sun protection comprising the steps of:

(a) uniformly dispersing purified water (balance after mixing the whole composition), 1-3 wt% of glycerin and 1-4 wt% of 1,3-butylene glycol in the aqueous phase uniformly over the entire composition;

(b) uniformly mixing the thickener in the water-in-oil type and the silicone emollient;

(c) uniformly mixing the auxiliary emulsifier and the ultraviolet screening agent; And

(d) uniformly dispersing the mixed water-in-oil type thickening agent and the silicate emollient of step (b) in the aqueous phase of step (a) using a homomixer, Adding a blocking agent and an antiseptic agent to form an emulsion using a homomixer.

Hereinafter, the above-mentioned steps will be described in more detail.

Step (a): Preparation of water component

Purified water, glycerin and 1,3-butylene glycol were precisely weighed and weighed in a vessel. The agglomerant was uniformly dispersed in the water phase using an agitator mixer and prepared at 70 ° C.

Step (b): Water type  Form Incrementer  And silicon Emollient  mix

Dimethicone, dimethicone, cyclopentasiloxane, a thickener blended with trideceth-6, caprylyl methicone, dimethicone / vinyl dimethicone cross The polymer and dimethicone are accurately weighed and mixed uniformly.

Step (c): Mixing of auxiliary emulsifier, sunscreen and preservative

As a secondary emulsifier, polysorbate 20, cetearyl alcohol and dicapryl carbonate were precisely weighed and diluted with precisely weighed quantities of ethylhexylmethoxycinnamate, ethylhexylsalicylate, isoamylparamethoxycinnamate and preservative as UV blocking agents And then heated to 70 ° C.

Step (d): Emulsion  formation

The material of step (b) is slowly mixed into the material of step (a) and homogeneously dispersed using a homomixer, followed by addition of a secondary emulsifier, ultraviolet screening agent and preservative to form homogeneous emulsion.

Step (e): Completion of the final product

After the emulsion of step (d) is turned on, the physical properties of the contents are checked, and then filled in a container to complete the preparation.

According to another aspect of the present invention, there is provided an ultraviolet-blocking cosmetic composition prepared by the above-described method for producing an ultraviolet-shielding cosmetic composition.

Since the details of the ultraviolet barrier cosmetic composition are related to the above-described ultraviolet barrier cosmetic composition, the same contents as those described above are omitted for the sake of the excessive complexity of the present invention.

The features and advantages of the present invention are summarized as follows:

(a) The present invention provides a cosmetic composition for UV-screening in water (oil-in-water) comprising: (a) a thickener in the form of a water-in- 1-10% by weight; And (b) 1-10% by weight of a silicone emollient for the entire composition.

(b) The water-in-oil type thickening agent included in the UV-blocking cosmetic composition of the present invention has a shape in which water and a water-soluble thickening agent are dissolved in silicone, so that even if a large amount of silicon is used, It is a type that inversion of the water-in-oil type emulsion causes the foreign water phase to increase like a gel and to trap and stabilize a large amount of silicon in the gel matrix, thereby eliminating the feeling of use of conventional sunscreen agents and eliminating a large amount of silicone emollient Thereby providing an advantage that the feeling can be improved.

Fig. 1 shows the appearance of the water-hydration type thickener used in the present invention.
Figure 2 shows the appearance of the water-in-oil type thickener used in the present invention. It has a shape that seems to release water and water-soluble thickener in silicon.
FIG. 3 shows the mechanism of the present invention in which an image is inverted in an underwater type emulsion formulation and the traumatic water phase is increased like a gel, and a large amount of silicon is trapped and stabilized in the increased gel matrix.
Fig. 4 shows an oil phase trapped in the gel phase of the actual water phase.
Fig. 5 shows sensory test results of the cosmetic composition for UV screening of the present invention. Example 2 of the present invention was able to obtain a higher score in comparison with Comparative Example 3 in terms of stickiness, oiliness, moisturizing feel, rolling feeling, moisture feel and adhesion.

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not to be construed as limiting the scope of the present invention. It will be self-evident.

Example

Example 1: Preparation of an ultraviolet barrier cosmetic composition containing water and a water-soluble gelling agent as a thickening agent to enhance stability of emulsification and enhance feeling of use

For the preparation of the base, the purified water, glycerin (pyridine) and 1,3-butylene glycol (A phase) shown in Table 1 below were weighed precisely and weighed in a vessel. And dispersed in water phase and prepared at 70 ° C. (Dow Corning), cyclopentasiloxane (Dow Corning), trideceth-6 (Dow Corning), and the like, (Dow Corning), dimethicone / vinyl dimethicone crosspolymer (KYORIM Corp.) and dimethicone (Shin-Etsu) were precisely weighed and then mixed uniformly to prepare a B-phase Respectively. Subsequently, to the reactor was added polysorbate 20 (croda), cetearyl alcohol (cognis) and dicapryl carbonate (cognis) (C phase), to which were added ethylhexylmethoxycinnamate (diSM), hexylhexylsalicylate ), Isoamyl para methoxycinnamate (deep seal) (D phase) and preservative (E phase) were precisely weighed, uniformly mixed and warmed to 70 ° C. Then, the prepared B phase was gradually mixed with the phase A, homogeneously dispersed using a homomixer, and then C, D, and E phases were added thereto to homogeneously disperse the emulsion. Next, we measured the F phase accurately. Thereafter, the physical properties of the contents were checked, and then filled in a container to complete the production.

Prize Raw material name Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 A Purified water Balance Balance Balance Balance Balance glycerin 2.0 2.0 2.0 2.0 2.0 1,3-butylene glycol 3.0 3.0 3.0 3.0 3.0 B Sodium polyacrylate, purified water, phage / piperidine-18/18 dimethicone, dimethicone, cyclopentasiloxane, trideceth-6 1.0 2.0 4.0 0.5 5.0 Caprylyl methicone 2.0 2.0 2.0 2.0 2.0 Dimethicone / Vinyl Dimethicone Crosspolymer 2.0 2.0 2.0 2.0 2.0 Dimethicone 1.0 1.0 1.0 1.0 1.0 C Polysorbate 20 0.2 0.2 0.2 0.2 0.2 Cetearyl alcohol 0.5 0.5 0.5 0.5 0.5 Dicapryl carbonate 0.2 0.2 0.2 0.2 0.2 D To a solution of < RTI ID = 0.0 & 7.5 7.5 7.5 7.5 7.5 To a solution of < RTI ID = 5.0 5.0 5.0 5.0 5.0 Isoamyl para methoxy cinnamate 2.0 2.0 2.0 2.0 2.0 E antiseptic 0.4 0.4 0.4 0.4 0.4 F incense 0.1 0.1 0.1 0.1 0.1

A phase: water component

B phase: Oil component - I

C phase: oil component _ II

D phase: organic sunscreen

E-phase: preservative

F Award: incense

Experimental Example  1: Property test and visual inspection

In order to test the physical properties of the cosmetic compositions of Examples 1 to 3 and Comparative Examples 1 and 2 by temperature, the following devices were used to measure the viscosity. The viscosity was measured with a Brookfield Viscometer LVT96540. 4 and RPM conditions of 6 rpm. The statistical comparative evaluation was conducted for one day after manufacture, and then the specific points of each temperature were visually evaluated. The evaluation results are shown in Table 2 below.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Viscosity Appearance Viscosity Appearance Viscosity Appearance Viscosity Appearance Viscosity Appearance 25 29000 O 58000 O 35 O 12000 60 O 40 28000 O 59000 O 36 O - X 58 O 50 29000 O 58000 O 35 O - X 57 O

O: Good,: DELTA Stability Anxiety, X: Stability Collapse

As shown in Table 2 above, it was found that the content of the emulsifiable incremental defective phase (phase B) is an important factor determining the overall physical properties. As shown in Examples 1-3 and Comparative Examples 1 and 2, when the content was less than 1.0% by weight, the viscosity was too low to stabilize a large amount of oil components. When 5.0% by weight was used, there was no problem in the stability of the formulation, PICK UP was not good when using the container of the present invention. In contrast, Example 1-3 formed a stable emulsion, PICK UP was also suitable, and showed stable physical properties and properties even at high temperatures.

Experimental Example  2 : HPLC Of sunscreen using Potency  exam

In order to confirm the uniformly dispersed state, a certain amount of sample was taken out and the comparative analysis with the standard material was carried out by HPLC. The results are shown in Table 3 below.

Example 2 Product Name R Main peak area Amount of sample content Retention rate (%) Calibration data IMC 2.808 797,013 0.0210 - - OMC 5.783 2,526,689 0.0752 OS 7.008 195,386 0.0501 Specimen IMC 2.800 811,530 0.1016 3.502 100.0 OMC 5.792 2,612,969 7.510 100.1 OS 7.008 199,801 4.986 99.7

* HPLC analysis conditions

Column: Symmetry C18 5 μm * 4.6 * 150 mm reversed phase column

Mobile phase: a mixture of acetonitrile and water

Detection: 305 nm

Flow: 1.5 ml / min

Run Time: 10 min

Table 3 above shows the content of the ultraviolet screening agent in the range of 99 ~ 101% compared with the standard sample.

Experimental Example  3: Sensor test ( SENSORY TEST )

For the preparation of the base, purified water, glycerin and 1,3-butylene glycol (A phase) shown in Table 4 below were weighed precisely and weighed in a container. The thickener was uniformly dispersed in the water phase using a paddle mixer, Lt; / RTI > Thereafter, an aqueous solution of sodium polyacrylate, purified water, phage / piperidine-18/18 dimethicone, dimethicone, cyclopentasiloxane, trideceth-6, caprylyl methicone, dimethicone / vinyl dimethicone cross polymer, Were precisely weighed, and then mixed homogeneously to prepare a B phase. (E phase) was added to polysorbate 20, cetearyl alcohol and dicapryl carbonate (phase C), and the resultant solution was stirred at room temperature for 1 hour. Were precisely weighed, mixed uniformly, and heated to 70 ° C. Then, the prepared B phase was gradually mixed with the phase A, homogeneously dispersed using a homomixer, and then C, D, and E phases were added thereto to homogeneously disperse the emulsion. Next, we measured the F phase accurately. Thereafter, the physical properties of the contents were checked, and then filled in a container to complete the production.

Prize Raw material name Example 2 Comparative Example 3 A Purified water Balance Balance glycerin 2.0 2.0 1,3-butylene glycol 3.0 3.0 B Sodium polyacrylate, purified water, phage / piperidine-18/18 dimethicone, dimethicone, cyclopentasiloxane, trideceth-6 2.0 - Caprylyl methicone 2.0 - Dimethicone / Vinyl Dimethicone Crosspolymer 2.0 - Dimethicone 1.0 - C Polysorbate 20 0.2 0.2 Polysorbate 60 - 1.3 Glyceryl stearate - 1.0 Cetearyl alcohol 0.5 0.5 Dicapryl carbonate 0.2 0.2 D To a solution of < RTI ID = 0.0 & 7.5 7.5 To a solution of < RTI ID = 5.0 5.0 Isoamyl para methoxy cinnamate 2.0 2.0 E antiseptic 0.4 0.4 F incense 0.1 0.1

A phase: water component

B phase: Oil component - I

C phase: oil component _ II

D phase: organic sunscreen

E-phase: preservative

F Award: incense

As shown in FIG. 5, in Experimental Example 3, data obtained from 30 panelists showed that although the water-based composition of general underwater type ultraviolet screening composition is rich in moisture, it can not eliminate the oily feeling and stickiness of a large amount of ultraviolet screening agent Example 2 improves moisturizing and rolling sensation and improves stickiness feeling.

Claims (5)

1-10% by weight of a thickener in the form of a water-in-oil type for the entire composition; And
And about 1-10% by weight of a silicone emollient for the entire composition,
Characterized in that the silicone emollient comprises dimethicone, cyclopentasiloxane or caprylyl methicone and dimethicone / vinyl dimethicone crosspolymer in a ratio of 1: 1-10: 1-10 on a weight basis (underwater Oil type) cosmetic composition for protecting against ultraviolet rays.
The cosmetic composition according to claim 1, wherein the thickener in the form of a water-in-oil type comprises the following thickening agent in the form of a whole water-in-oil type:
(a) Dimethicone: 1-20% by weight;
(b) cyclopentasiloxane: 1-10% by weight;
(c) sodium polyacrylate: 1-30 wt%;
(d) trideceth-6: 1-10% by weight;
(e) Pigment / Pigment-18/18 Dimethicone: 1-5% by weight; And
(f) Purified water: 10-40 wt%.
delete The cosmetic composition for protecting ultraviolet rays according to claim 1, wherein the cosmetic composition for ultraviolet shielding further comprises the following auxiliary emulsifier and ultraviolet screening agent:
(a) 0.1-5% by weight of at least one secondary emulsifier selected from the group consisting of polysorbate, cetearyl alcohol, dicapryl carbonate and behenyl alcohol for the total composition; And
(b) 5-20% by weight of at least one sunscreen selected from the group consisting of ethylhexylmethoxycinnamate, ethylhexylsalicylate, isoamyl P-methoxycinnamate for the entire composition.
A method for preparing a cosmetic composition for underwater sun protection comprising the steps of:
(a) uniformly dispersing purified water (balance after mixing the whole composition), 1-3 wt% of glycerin and 1-4 wt% of 1,3-butylene glycol in the aqueous phase uniformly over the entire composition;
(b) uniformly mixing the silicone emollient of claim 1 and the thickener in the form of a water-in-oil type of claim 1 or 2;
(c) uniformly mixing the auxiliary emulsifier and the ultraviolet screening agent of claim 4; And
(d) uniformly dispersing the water-in-oil type thickening agent and the silicone emollient of the step (b) in the aqueous phase of the step (a) using a homomixer and then adding the auxiliary emulsifier, And a step of adding an antiseptic agent to form an emulsion using a homomixer.

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