JP2016222602A - Oily dispersion, emulsified composition using oily dispersion and cosmetic using emulsified composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oily dispersion which disperses within the system without an aggregation phenomenon of zinc oxide or titanium oxide and ethylhexyl methoxycinnamate aggregating on mixing as in the prior art, and an emulsified composition using the oily dispersion.SOLUTION: An oily dispersion of the present invention is characterized by comprising zinc oxide or titanium oxide, ethylhexyl methoxycinnamate, and a polyhydroxy fatty acid.SELECTED DRAWING: Figure 1

Description

The present invention uses an oil-based dispersion containing zinc oxide or titanium oxide having an ultraviolet shielding ability and ethylhexyl methoxycinnamate (hereinafter also referred to as OMC) having an ultraviolet absorption ability, and the oil dispersion. The emulsified composition. Specifically, an oil dispersion that can disperse zinc oxide or titanium oxide and OMC, which would cause aggregation when mixed, in the system without causing an aggregation phenomenon, and an emulsified composition using the oil dispersion It is about.
Moreover, it is related with the cosmetics using this emulsion composition.

  Conventionally, it is known that zinc oxide or titanium oxide has an ultraviolet shielding ability, and OMC has an ultraviolet absorbing ability.

However, when zinc oxide or titanium oxide and OMC are used in combination, an agglomeration phenomenon occurs. Therefore, it is difficult to form a uniform dispersion state for zinc oxide or titanium oxide and OMC. There was a problem that it was difficult to maintain.
Therefore, in the past, if zinc oxide or titanium oxide and OMC were used in combination, the ultraviolet shielding ability of zinc oxide or titanium oxide and the ultraviolet absorption ability of OMC could not be expressed sufficiently and stably. is there.

  In addition, as a composition using zinc oxide and OMC in combination, for example, Patent Document 1 discloses an ultraviolet shielding cosmetic containing zinc oxide and OMC.

JP 2006-335654 A

  However, as described in [0007] of Patent Document 1, the cosmetic is intended to improve the unpleasant odor of OMC, and aggregates zinc oxide or titanium oxide and OMC. It is not intended to be used together (dispersed). In addition, although the evaluation result is disclosed by patent document 1 about odor, nothing is made | formed about the dispersion state.

As a result of intensive investigations, the inventors of the present application have recently found an oily dispersion that can disperse zinc oxide or titanium oxide and OMC in the system without causing an aggregation phenomenon by using polyhydroxy fatty acid. It came to obtain the knowledge that it can be obtained.
Moreover, the emulsion composition and cosmetics produced using such an oil-based dispersion may exhibit extremely higher ultraviolet shielding ability and ultraviolet absorption ability than conventional emulsion compositions and cosmetics using OMC. all right.

The present invention has been made in view of the above-mentioned conventional problems, and zinc oxide or titanium oxide and OMC, which would cause aggregation in the past, are dispersed in the system without causing the aggregation phenomenon. It is an object of the present invention to provide an oily dispersion that can be used and an emulsified composition using the oily dispersion.
Moreover, it aims at provision of the cosmetics using this emulsion composition.

  In order to achieve the above object, an oily dispersion according to claim 1 of the present invention is characterized by containing zinc oxide or titanium oxide, ethylhexyl methoxycinnamate, and polyhydroxy fatty acid.

  The oil dispersion according to claim 2 of the present invention is characterized in that the content of polyhydroxy fatty acid is 0.05 to 20% by weight with respect to the total weight of the oil dispersion.

  The oil dispersion according to claim 3 of the present invention is characterized in that the content of ethylhexyl methoxycinnamate is 30 to 80% by weight based on the total weight of the oil dispersion.

  The oil dispersion according to claim 4 of the present invention is characterized in that the polyhydroxy fatty acid is polyhydroxystearic acid or a derivative of polyhydroxystearic acid.

  An emulsified composition according to claim 5 of the present invention is characterized by containing the oily dispersion according to any one of claims 1 to 4.

  The emulsion composition according to claim 6 of the present invention further contains an emulsifier.

  The emulsion composition according to claim 7 of the present invention is characterized by further containing a cyclic siloxane or a hydrocarbon oil.

  The emulsion composition according to claim 8 of the present invention is characterized in that any of 10% cumulative particle diameter (D10), 50% cumulative particle diameter (D50), and 90% cumulative particle diameter (D90) is 1 μm or less. And

  The emulsion composition according to claim 9 of the present invention is characterized in that the light transmittance at 330 to 370 nm is 20% or less.

  A cosmetic according to claim 10 of the present invention is characterized in that the oil-based dispersion according to any one of claims 1 to 4 is blended.

  A cosmetic according to claim 11 of the present invention is characterized in that the emulsified composition according to any one of claims 5 to 9 is blended.

  According to the oil dispersion according to the present invention, by containing zinc oxide or titanium oxide, ethyl hexyl methoxycinnamate, and polyhydroxy fatty acid, ethyl hexyl methoxycinnamate without agglomerating zinc oxide or titanium oxide. Can be mixed with.

  According to the oily dispersions according to claims 2 and 3 of the present invention, the above effects can be more remarkably exhibited by setting the contents of ethylhexyl methoxycinnamate and polyhydroxy fatty acid within a specific range. .

  According to the oil-based dispersion according to claim 4 of the present invention, the above effect can be more remarkably exhibited by using a specific compound for the polyhydroxy fatty acid.

  According to the emulsion composition according to claims 5 to 9 of the present invention, by emulsifying the oil dispersion according to the present invention, zinc oxide or titanium oxide and methoxysilicate uniformly dispersed without aggregation in the oil dispersion. The dispersion state of ethylhexyl cinnamate can be stably maintained even in an emulsified state such as O / W type and W / O type.

  In particular, according to the oil-based dispersion according to claim 7 of the present invention, by containing a cyclic siloxane or hydrocarbon oil as a dispersion medium, further zinc oxide or titanium oxide and ethylhexyl methoxycinnamate are not aggregated. It is possible to obtain an oily dispersion that can be uniformly dispersed and stabilized in its dispersed state.

  According to the cosmetics according to claims 10 and 11 of the present invention, by using the oily dispersion according to the present invention or the emulsified composition according to the present invention, UV shielding ability and methoxycinnax possessed by zinc oxide or titanium oxide. It is possible to obtain a cosmetic that can fully exhibit both performances without impairing the performance of the ultraviolet absorption property of ethyl hexyl.

2 is a graph showing transmittance curves of oil dispersions of Example 1 and Comparative Example 1. FIG. 4 is a graph showing transmittance curves of oil dispersions of Example 2 and Comparative Example 2. Optical immediately after preparation of the emulsion composition of Example 3 (using the oil dispersion of Example 1), the emulsion composition of Comparative Example 3 (using the oil dispersion of Comparative Example 1), and the emulsion composition of Comparative Example 4 It is a micrograph. 7 days after preparation of the emulsion composition of Example 3 (using the oil dispersion of Example 1), the emulsion composition of Comparative Example 3 (using the oil dispersion of Comparative Example 1), and the emulsion composition of Comparative Example 4 It is an optical microscope photograph at the time of progress. The transmittance curves of the emulsion composition of Example 3 (using the oil dispersion of Example 1), the emulsion composition of Comparative Example 3 (using the oil dispersion of Comparative Example 1), and the emulsion composition of Comparative Example 4 are as follows. It is a graph to show.

  Embodiments of the present invention will be described with reference to the drawings. The embodiment described below is merely an example embodying the present invention, and does not limit the technical scope of the present invention.

(Basic structure)
The oily dispersion according to the present invention has a basic structure containing zinc oxide or titanium oxide, ethylhexyl methoxycinnamate (OMC), and polyhydroxy fatty acid.
Thus, by using polyhydroxy fatty acid as an essential component, it is possible to disperse zinc oxide or titanium oxide and OMC in the system without causing the agglomeration phenomenon, which previously caused an agglomeration phenomenon. is there.

  Hereinafter, each component of the present invention will be described.

(Zinc oxide or titanium oxide)
Zinc oxide or titanium oxide used in the present invention is not particularly limited as long as it has ultraviolet shielding ability, but the average primary particle size is 1 to 1 in order to fully exhibit its characteristics. It is preferable to use one having a range of 100 nm. Of these, those in the range of 5 to 70 nm are preferably used, and more preferably in the range of 5 to 50 nm.

  Moreover, what processed the surface with various compounds can also be used for the zinc oxide or titanium oxide used for this invention. Examples of such a compound include isostearic acid or a metal salt of isostearic acid.

Furthermore, when surface treatment is performed using isostearic acid or a metal salt of isostearic acid, an inorganic oxide such as aluminum is used in advance in order to improve the light resistance of zinc oxide or titanium oxide and to suppress the reactivity with other substances. Alternatively, zinc oxide or titanium oxide can be coated with a hydroxide.
As a coating method, for example, zinc oxide or titanium oxide is dispersed in an aqueous system, and an inorganic oxide such as aluminum or a water-soluble salt of hydroxide is dissolved therein, and the powder surface is adjusted while adjusting pH. For example, a method of coating zinc oxide or titanium oxide by depositing a substance to be coated such as aluminum hydroxide on the surface. At this time, the metal salt of isostearic acid or isostearic acid is mixed with the inorganic oxide such as aluminum or the water-soluble salt of hydroxide and the water in which zinc oxide or titanium oxide serving as the base material is dispersed. Alternatively, an inorganic oxide such as aluminum or a water-soluble salt of hydroxide may be dissolved and mixed after the coating treatment.

  In addition, when a metal salt containing isostearic acid as a main constituent component such as aluminum isostearate is used, the same effect as the above-described coating treatment can be obtained during the surface treatment without performing the treatment.

  Here, the ratio of the inorganic oxide or hydroxide which is a coating substance to zinc oxide or titanium oxide in the coating treatment is preferably 1 to 25% by weight, more preferably 2 to 15% by weight in terms of oxide. If it is less than 1%, the light resistance cannot be sufficiently improved and the reactivity can not be sufficiently exerted. If it exceeds 25%, the ratio of zinc oxide or titanium oxide in the oil dispersion is decreased, resulting in a decrease in ultraviolet shielding ability. This is because, and the effect of the covering process reaches its peak.

  The content of zinc oxide or titanium oxide in the oil dispersion is appropriately determined according to the desired ultraviolet shielding effect, but from the viewpoint of the viscosity, transparency, usability, etc. of the oil dispersion, It is preferably 20 to 80% by weight based on the total weight of the dispersion, and more preferably 30 to 70% by weight based on the total weight of the oily dispersion.

(Ethylhexyl methoxycinnamate)
Ethylhexyl methoxycinnamate (OMC) used in the present invention has a UV-absorbing ability, and is a compound that excels in UV-absorbing ability in the UVB region (about 280 to 320 nm).
The content of OMC in the oil dispersion is appropriately determined according to the desired ultraviolet absorption effect. From the viewpoint of the viscosity, transparency, usability, etc. of the oil dispersion, It is preferably 30 to 80% by weight based on the weight, and more preferably 40 to 60% by weight based on the total weight of the oil dispersion.

(Polyhydroxy fatty acid)
The polyhydroxy fatty acid used in the present invention is blended together with zinc oxide or titanium oxide and OMC, and prevents the aggregation phenomenon of zinc oxide or titanium oxide and OMC in the system of the oil dispersion. This is to improve the dispersibility of the material. In addition, even when an emulsion composition to be described later is prepared using an oil-based dispersion, the aggregation phenomenon of zinc oxide or titanium oxide and OMC is prevented, and the effect of improving the dispersibility of each material is expressed. It is.
Among such polyhydroxy fatty acids, it is preferable to use polyhydroxystearic acid or polyhydroxystearic acid derivatives.
The content of polyhydroxy fatty acid in the oil dispersion is appropriately determined according to the content of zinc oxide or titanium oxide or the content of OMC, but is 0 with respect to the total weight of the oil dispersion. The content is preferably 0.05 to 20% by weight, and more preferably 0.1 to 10% by weight with respect to the total weight of the oil dispersion. In addition, when zinc oxide or titanium oxide is used as a reference, it is preferably 0.1 to 30% by weight based on zinc oxide or titanium oxide, and among these, 0.2 to 0.2% relative to zinc oxide or titanium oxide. More preferably, it is 20% by weight.

(Light transmittance)
Further, as described above, the oil dispersion according to the present invention can be mixed with ethylhexyl methoxycinnamate without agglomerating zinc oxide or titanium oxide. Absorbability will be expressed.
Specifically, when it is applied as a film having a thickness of 10 μm, in the ultraviolet region, the light transmittance at 250 to 350 nm exhibits a high ultraviolet shielding ability and ultraviolet absorbing ability of 5% or less. On the other hand, in the visible light range, the light transmittance at 450 nm to 700 nm is as high as 80% or higher.

(Production method)
It does not specifically limit as a manufacturing method of the oil-based dispersion concerning this invention, It can manufacture by what is called a batch process which mix | blends and mixes each component requirement at once. Also, by mixing zinc oxide or titanium oxide and polyhydroxy fatty acid, then adding OMC and mixing, or first mixing OMC and polyhydroxy fatty acid, then adding and mixing zinc oxide or titanium oxide It can also be manufactured.

(Emulsified composition, basic structure)
Next, the emulsified composition according to the present invention will be described.
The emulsified composition according to the present invention has a basic structure containing the above-described oil-based dispersion according to the present invention. The emulsified composition according to the present invention may be either an O / W type or a W / O type emulsified form, and a multiphase type emulsified form such as an O / W / O type or a W / O / W type. It may be.

(emulsifier)
The emulsified composition according to the present invention may contain various emulsifiers as necessary. By containing an emulsifier in this way, the emulsified state of the emulsified composition can be maintained more stably. Examples of such an emulsifier include polyether-modified silicone and sorbitan fatty acid ester. Of these, PEG-9 dimethicone, PEG-10 dimethicone, and sorbitan isostearate are preferably used.
The emulsifier content in the emulsified composition is appropriately determined according to the content of the oil dispersion to be blended, but is 1 to 30% by weight with respect to the total weight of the emulsified composition. Among them, the content is more preferably 2 to 20% by weight with respect to the total weight of the emulsion composition.

(Dispersion medium)
In addition, the emulsion composition according to the present invention may contain cyclic siloxane or hydrocarbon oil as a dispersion medium.
By containing the dispersion medium in this manner, an emulsion composition can be obtained in which zinc oxide or titanium oxide and OMC are uniformly dispersed without agglomeration and the dispersion state is stabilized.
Here, since the cyclic siloxane needs to be liquid at room temperature, it should be a pentamer (so-called D5 oil: decamethylcyclopentasiloxane) or more. Examples of hydrocarbon oils include liquid paraffin, light liquid isoparaffin, heavy liquid isoparaffin, isobutene, hydrogenated polyisobutene, isohexadecane, isodecane, isododecane, eicosane, isoeicosane, and squalane. Of these, decamethylcyclopentasiloxane (D5 oil) or liquid paraffin is preferably used from the viewpoint of excellent dispersibility of zinc oxide or titanium oxide and OMC.
The content of the dispersion medium in the emulsified composition is appropriately determined according to the content of zinc oxide or titanium oxide, OMC, and polyhydroxy fatty acid to be blended. The content is preferably 5 to 30% by weight, and more preferably 10 to 20% by weight with respect to the total weight of the emulsified composition.

(Particle size)
The emulsified composition according to the present invention includes zinc oxide or titanium oxide, OMC, and polyhydroxy fatty acid as essential constituent elements, so that zinc oxide or titanium oxide and OMC do not aggregate in the system. It is dispersed in a stable state.
Specifically, the 10% cumulative particle size (D10), 50% cumulative particle size (D50), and 90% cumulative particle size (D90) are all stably dispersed in a very fine particle state of 1 μm or less. It will be.

(Light transmittance)
Further, as described above, the emulsified composition according to the present invention is a conventional emulsification using OMC because zinc oxide or titanium oxide and OMC are dispersed stably in the system without causing aggregation. It exhibits an ultraviolet shielding ability and an ultraviolet absorbing ability that are extremely higher than those of the composition.
Specifically, when a film having a thickness of 10 μm is used, not only the light transmittance at 250 to 325 nm is 5% or less, but also an extremely high ultraviolet shielding ability and ultraviolet absorption ability are exhibited, and the light transmission at 330 to 370 nm. As for the rate, high ultraviolet shielding ability and ultraviolet absorption ability of 20% or less are exhibited.
Here, all of zinc oxide, titanium oxide, and OMC express the so-called UVB region (280 to 320 nm) of ultraviolet shielding ability and ultraviolet absorbing ability. Because titanium and OMC can be dispersed in a stable state in the system, not only the ultraviolet shielding ability and ultraviolet absorbing ability in the UVB region (280 to 320 nm) but also the conventional aggregation of zinc oxide or titanium oxide. As a result, high UV shielding ability and UV absorbing ability are also exhibited in the UVA region (320 to 400 nm), which is a region where sufficient shielding ability and absorption ability cannot be expressed.
Furthermore, in the visible light region, the light transmittance at 390 nm is 70% or more, and the light transmittance at 410 nm to 700 nm is 90% or more.

(Production method)
The production method of the emulsified composition according to the present invention is not particularly limited, and can be produced by so-called batch processing in which each constituent element is blended and mixed at one time, but a more stable emulsified state (dispersion) From the point that an emulsified composition in a state) can be obtained, it is preferable that the aqueous phase component is first mixed, and the aqueous phase component is added to the oily dispersion little by little and then mixed.

(Cosmetics)
Since the cosmetic according to the present invention is a blend of the oily dispersion according to the present invention or the emulsified composition according to the present invention, high transparency (transmittance in the visible light range) is continued with high ultraviolet shielding ability. As a result, it becomes a cosmetic.
In addition, in the cosmetics which concern on this invention, the various components normally used by cosmetics can be arbitrarily contained in addition to the oil-based dispersion of this invention mentioned above or the emulsion composition which concerns on this invention. In addition to the above-mentioned various oils, the components include organic powders such as crystalline cellulose, crosslinked methylpolysiloxane, polyethylene powder, acrylic resin powder, talc, mica, sericite, magnesium carbonate, calcium carbonate, oxidation Inorganic powders such as iron, bitumen, ultramarine, titanium mica, titanium sericite, and silica (Note that the surface of the powder may be surface-treated with a coupling agent or an inorganic compound to the extent that there is no problem in use. ), Acrylic acid / alkyl methacrylate copolymers and / or salts thereof, carboxyvinyl polymers and / or salts thereof, thickeners such as xanthan gum and hydroxypropyl cellulose, retinol, retinoic acid, tocopherol, riboflavin, pyridoxine, ascorbic acid, ascorbine Vitamins such as acid phosphates Terpenes such as glycyrrhizinate, glycyrrhizinate, glycyrrhetin, ursolic acid, oleanolic acid, steroids such as estradiol, ethinylestradiol, estriol, preservatives such as phenoxyethanol, parabens, hibitengluconate, benzalkonium chloride, dimethylaminobenzoic acid Examples include ultraviolet absorbers such as acid esters, cinnamic acid esters, and benzophenones.

  Next, the oil dispersion according to the present invention will be described in detail based on Examples and Comparative Examples. In addition, this invention is not limited to a following example.

Example 1
The surface of zinc oxide (manufactured by Teika Co., Ltd .: MZ-500, average primary particle size 25 nm) as a base material was treated with isostearic acid (10% by weight with respect to zinc oxide) and treated with 1.575 kg of methoxycinnax Example 1 by adding 1.305 kg of ethyl hexyl acid (manufactured by BASF: Uvinul MC80) and 120 g of polyhydroxystearic acid (manufactured by Nisshin Oilio Group Co., Ltd .: Saracos HS-6C) and carrying out dispersion treatment using a sand grinder mill. An oily dispersion was prepared.

(Example 2)
Titanium oxide surface-treated with isostearic acid (Taika Co., Ltd .: MT-10EX: average primary particle size 10 nm) 1.200 kg, ethylhexyl methoxycinnamate (BASF: Uvinul MC80) 1.680 kg and polyhydroxystearic acid ( The oil dispersion of Example 2 was produced by adding 120g of Nisshin Oilio Group Co., Ltd .: Saracos HS-6C) and performing a dispersion process using a sand grinder mill.

(Comparative Example 1)
An oily dispersion of Comparative Example 1 was prepared in the same manner as in Example 1 except that polyhydroxystearic acid was not used and the amount of ethylhexyl methoxycinnamate was changed to 1.425 kg.

(Comparative Example 2)
An oily dispersion of Comparative Example 2 was prepared in the same manner as in Example 2 except that polyhydroxystearic acid was not used and the amount of ethylhexyl methoxycinnamate was changed to 1.800 kg.

(Evaluation of transmittance)
Next, the transmittance of the oil dispersions of Examples 1 and 2 and Comparative Examples 1 and 2 was evaluated. Evaluation was performed using a spectrophotometer U-4100 (manufactured by Hitachi High-Technologies Corporation). The results are shown in FIGS.
As a result, the oily dispersions of Examples 1 and 2 were mainly dispersed in the system without aggregation of zinc oxide or titanium oxide and OMC, and therefore mainly in the UVB region (specifically, It was found that it has an excellent ultraviolet shielding ability and ultraviolet absorption ability that ultraviolet rays at 250 to 350 nm) are hardly transmitted. In particular, it was found that the oil-based dispersion of Example 1 has an excellent ultraviolet shielding ability and ultraviolet absorbing ability that hardly transmits ultraviolet rays not only in the above-described region but also up to a wavelength region of 375 nm. .
Moreover, it turned out that transparency is higher than the oil dispersions of Comparative Examples 1 and 2 in the visible light region.

  Next, the emulsion composition according to the present invention will be described in detail based on Examples and Comparative Examples. In addition, this invention is not limited to a following example.

(Example 3, Comparative Example 3, Comparative Example 4)
Oil dispersions of Example 1 and Comparative Example 1, silicone-treated zinc oxide (manufactured by Teika Co., Ltd .: MZY-303S: average primary particle size 35 nm) dispersed in D5 oil (all oil dispersions) The emulsion compositions of Example 3, Comparative Example 3, and Comparative Example 4 were prepared at a blending ratio shown in Table 1 using 60% by weight of zinc oxide treated with silicone with respect to weight.
Specifically, first, the oil phase components shown in Table 1 were weighed, placed in a container, and mixed with a disper. Next, the water phase components listed in Table 1 were weighed, placed in a separate container, and mixed with a disper. Then, the emulsion composition of Example 3, the comparative example 3, and the comparative example 4 was produced by adding slowly the produced water phase component to the container which mixed the oil phase component, and mixing with a disper.

(Evaluation of emulsified state)
Next, the emulsified state (dispersed state) of the emulsified compositions of Example 3, Comparative Example 3, and Comparative Example 4 was evaluated immediately after production and 7 days after production. Evaluation was performed by observation with an optical microscope. The results are shown in FIGS.
As a result, the emulsified composition of Example 3 was not only immediately after production as shown in FIG. 3, but also at the time of 7 days after production as shown in FIG. It was confirmed that the dispersion was uniform in the system and the dispersion state was stable.
In addition, the measurement results of the particle size analyzed by the image imaging method of the optical micrograph are shown in Table 2. The emulsion composition of Example 3 has a 10% cumulative particle size (D10) and a 50% cumulative particle size (D50). It was found that particles were not finely measured (1 μm or less) in all 90% cumulative particle diameters (D90) (1 μm or less) and were finely emulsified (dispersed), and uniformly dispersed without aggregation.
On the other hand, with respect to the emulsified compositions of Comparative Example 3 and Comparative Example 4, aggregates were observed immediately after production as shown in FIG. 3, and as time passed, large particles on the order of μm were confirmed as shown in FIG. From this, it was confirmed that the aggregation phenomenon was further advanced. In addition, it was confirmed that aggregation occurred in the measurement result of the particle diameter analyzed by the image imaging method of the optical micrograph.

(Evaluation of transmittance)
Next, the transmittance of the emulsified compositions of Example 3, Comparative Example 3, and Comparative Example 4 was evaluated. Evaluation was performed using a spectrophotometer U-4100 (manufactured by Hitachi High-Technologies Corporation). The results are shown in FIG.
As a result, in the emulsified composition of Example 3, since zinc oxide and OMC were uniformly dispersed in the system without agglomeration, first, as shown in FIG. In particular, it was confirmed that the ultraviolet ray at 250 to 325 nm) has an excellent ultraviolet ray shielding ability and ultraviolet ray absorbing ability that hardly transmits ultraviolet rays. Moreover, it has confirmed that it has high ultraviolet-ray shielding ability and ultraviolet-ray absorption ability also with respect to 330-370 nm ultraviolet rays. That is, the emulsified composition of Example 3 (emulsified composition according to the present invention) not only sufficiently exhibits the ultraviolet shielding ability possessed by zinc oxide and the ultraviolet absorbing ability possessed by OMC, but conventionally zinc oxide or oxidized It was confirmed that the UVA region (320 to 400 nm), which was a region where sufficient shielding ability and absorption ability could not be expressed due to aggregation of titanium, also exhibited high ultraviolet shielding ability and ultraviolet absorption ability.
On the other hand, the emulsion compositions of Comparative Example 3 and Comparative Example 4 had an ultraviolet transmittance of about 50% at 330 to 370 nm, resulting in poor ultraviolet shielding ability and ultraviolet absorbing ability.

  From the above results, the oil-based dispersion and the emulsion composition according to the present invention can uniformly disperse zinc oxide or titanium oxide and ethylhexyl methoxycinnamate, and stabilize the dispersion state. I found out that I could do it. And as a result, it turned out that a high ultraviolet-ray protective effect is shown.

  The oily dispersion of the present invention can be used for cosmetics (foundation, sunscreen, etc.), paints and the like.

Claims (11)

Zinc oxide or titanium oxide,
Ethyl hexyl methoxycinnamate,
An oily dispersion comprising polyhydroxy fatty acid.
The polyhydroxy fatty acid content is
The oil dispersion according to claim 1, wherein the content is 0.05 to 20% by weight based on the total weight of the oil dispersion.
The content of ethyl hexyl methoxycinnamate is
The oil dispersion according to claim 1 or 2, wherein the oil dispersion is 30 to 80% by weight based on the total weight of the oil dispersion.
The polyhydroxy fatty acid is
The oily dispersion according to any one of claims 1 to 3, which is polyhydroxystearic acid or a derivative of polyhydroxystearic acid.
An emulsified composition comprising the oil-based dispersion according to any one of claims 1 to 4.
further,
The emulsified composition according to claim 5, comprising an emulsifier.
further,
The emulsified composition according to claim 5 or 6, which contains cyclic siloxane or hydrocarbon oil.
The 10% cumulative particle diameter (D10), 50% cumulative particle diameter (D50), and 90% cumulative particle diameter (D90) are all 1 μm or less, and any one of claims 5 to 7 The emulsified composition according to item.
The emulsion composition according to any one of claims 5 to 8, wherein a light transmittance at 330 to 370 nm is 20% or less.
A cosmetic comprising the oil dispersion according to any one of claims 1 to 4.
A cosmetic comprising the emulsion composition according to any one of claims 5 to 9.