JP6265371B2 - Cosmetics - Google Patents

Description

The present invention contains appropriate amounts of 1) synthetic stevensite, 2) solid organic UV absorber, 3) liquid organic UV absorber, 4) higher alcohol, and 5) polyglyceryl-10 pentastearate. O / W emulsification type cosmetics that can contain a solid organic UV absorber stably without crystal precipitation and have a fresh feeling of use while having UV protection ability over a wide range from UVA to UVB. Regarding fees.

  Among the ultraviolet rays falling on the ground, the wavelength region called UVA (320 to 400 nm) is said to cause skin aging, and the wavelength region called UVB (280 to 320 nm) is said to cause skin cancer. Protecting the skin from skin is one of the important functions of cosmetics.

  For this reason, in order to give cosmetics a UV protection effect, inorganic UV protection agents such as titanium oxide and zinc oxide, organic UV absorbers such as cinnamic acid and the like have been widely used (Non-Patent Document 1). ~ 3).

  In recent years, consumer interest in UV protection has increased from the viewpoint of beauty, and there has been a demand for the development of cosmetics with high UV protection capabilities over a wide UV wavelength range from UVA to UVB. There is a tendency to prefer emulsified cosmetics having a feeling of O / W (an oil phase dispersed in an aqueous phase).

  As an inorganic ultraviolet protective agent for imparting ultraviolet protective ability to cosmetics, zinc oxide, fine particle titanium oxide and the like are widely used.

  However, when zinc oxide or fine particle titanium oxide is contained at a high concentration, a squeak is generated. Therefore, it is difficult to achieve both a high UV protection ability and a good feeling of use only with an inorganic UV protection agent.

  Therefore, in most cases, an organic ultraviolet absorber is contained to give cosmetics a high ultraviolet protection ability.

  Many organic ultraviolet absorbers (especially those having a maximum absorption wavelength region in the UVA region) are solid at room temperature, and when they are contained in an emulsifying system, they are dissolved in highly polar ester oils. Is done.

  Therefore, in order to contain a solid organic ultraviolet absorber at a high concentration, the ester oil used as a solvent must also be contained at a high concentration, which causes an oily, sticky feel and destabilization of emulsification. End up.

  From these points, it is difficult to achieve both high UV protection ability and fresh feeling.

  In Patent Document 1, a solid organic ultraviolet absorber, diethylaminohydroxybenzoyl hexyl benzoate, is contained at a high concentration by selecting an ester oil, and accordingly, ester oil must also be contained at a high concentration. , Freshness will be impaired even in O / W emulsified cosmetics.

  In Patent Document 2, 4-tert-butyl-4'-methoxydibenzoylmethane, hectorite, and soap are contained, but not only the surfactant that can be used in soap emulsification is limited, but also water resistance. Lack.

  As described above, there is a demand for the development of cosmetics having a stable emulsification state and a fresh feeling of use while having a high UV protection ability over a wide UV wavelength range from UVA to UVB.

JP 2010-59136 A JP2011-73971

FRAGRANCE JOURNAL, 27 (5), page 25-30 (1999) J. et al. SOC. COSMET. CHEM. JAPAN, Vol. 31, no. 4, page 373-384 (1997) FRAGANCE JOURNAL, 28 (5), page 26-32 (2000)

  The problem to be solved by the invention of the present application is to provide a cosmetic with a fresh feeling of use while stably containing a solid organic ultraviolet absorber.

In such a situation, the inventors of the present invention conducted intensive research, and as a component,
1) Synthetic stevensite 0.3-0.5 wt%
2) One to two organic ultraviolet absorbers selected from hexyl diethylaminohydroxybenzoyl benzoate and 4-tert-butyl-4'-methoxydibenzoylmethane 4 to 7% by weight
3) 5 to 10% by weight of one or two organic ultraviolet absorbers selected from octyl methoxycinnamate and octocrylene
4) One or two or more higher alcohols having 16 to 22 carbon atoms 0.1 to 5% by weight
5) 0.5-5% by weight of polyglyceryl-10 pentastearate
And the oil-in-water emulsified cosmetic containing the composition of the present invention has been found to provide a fresh feeling of use while stably containing a solid organic ultraviolet absorber.

  The synthetic stevensite used in the present invention is a synthetic stevensite composed of a stevensite-type magnesium sodium phyllosilicate substantially composed of only magnesium, sodium, and silicon.

  A particularly suitable synthetic stevensite has a chemical composition represented by the formula (1).

(Chemical formula 1)
Mg _x Na _y Si ₄ O ₁₀ (OH) ₂ .Naz (1)
(X + y <3.0, 2.0 ≦ x, y = 0 or 0.1, 0 <z <1.0)

  Where x and y are numbers greater than or equal to 2.0 under the condition x + y <3.0, y is a number from 0 to 0.1, and z is a number greater than 0 and less than 1.0. It is.

The content of the synthetic stevensite necessary for maintaining a stable emulsified state is in the range of 0.3 to 0.5% by weight, which is particularly stable and has a suitable pH.

  In the present invention, one or two solid organic ultraviolet rays selected from hexyl diethylaminohydroxybenzoyl benzoate and 4-tert-butyl-4'-methoxydibenzoylmethane are used to provide UV protection in the UVA region. Use absorbent.

The content of the solid organic ultraviolet absorber capable of stably maintaining the emulsified state is in the following range.

That is, it is 4 to 7% by weight in order to impart good emulsification stability and sufficient UV protection ability in the UVA region .

  In this invention, in order to provide higher ultraviolet-ray protective ability, you may contain another organic type ultraviolet absorber in the range which does not impair the effect of this invention.

  Specific examples include phenylbenzimidazole sulfonic acid, bisethylhexyloxyphenol methoxyphenyl triazine, octyl salicylate, cinoxalate, dihydroxydimethoxybenzophenone, dihydroxydimethoxybenzophenone sodium disulfonate, tetrahydroxybenzophenone, and ferulic acid. Without limitation, bisethylhexyloxyphenol methoxyphenyl triazine having a broad absorption wavelength region from UVA to UVB is preferred.

  In this invention, in order to provide the ultraviolet-ray defense capability of a UVB area | region, the 1 type (s) or 2 or more types of liquid organic type ultraviolet absorbers chosen from octyl methoxycinnamate and octocrylene are used.

Grant fresh feeling, to impart UV protection ability of good emulsifying stability and adequate UVB range, the content of the organic ultraviolet absorber liquid is 5 to 10 wt%.

  In the present invention, a higher alcohol having 16 to 22 carbon atoms is used in order to impart good emulsion stability and usability.

  Specific examples include cetyl alcohol, stearyl alcohol, isostearyl alcohol, oleyl alcohol, aralkyl alcohol, and behenyl alcohol, and a mixture thereof may be used.

  Specific examples of the mixture include alcohol NO. 20-B, cetanol, cetanol SP-D50, cetanol SP-D70, cetanol H (made by the higher alcohol industry company) etc. are mentioned, However It does not specifically limit.

  Further, a compound in which a higher alcohol and a polyhydric alcohol are ether-bonded is regarded as a higher alcohol in the present invention, and examples thereof include batyl alcohol.

  The content of the higher alcohol necessary for imparting good emulsification stability and usability is 0.1 to 5% by weight, particularly preferably 0.5 to 3% by weight.

In the present invention, a specific lipophilic surfactant having an HLB of 6 or less is used. HLB is an index indicating the affinity of a surfactant, and the lower the HLB, the more lipophilic behavior such as easier dispersion in the oil phase.

  As a method for calculating the HLB in the present invention, the Griffin method is used and is defined as follows.

(Griffin method)
HLB = [formula weight of hydrophilic group / molecular weight of surfactant] × 20

Used in the present invention, the specific HLB of 6 or less surfactant is a penta stearic acid poly glyceryl -10.

The content of polyglyceryl-10 pentastearate, which is a specific lipophilic surfactant having an HLB of 6 or less necessary for imparting good emulsion stability and a fresh feeling of use, is 0.5 to 5% by weight, 1 to 3 weight% is especially preferable.

  Furthermore, in the present invention, an inorganic ultraviolet protective agent or a composite thereof may be contained in order to impart a makeup effect such as higher ultraviolet protective ability or covering power.

  Specific examples include anatase-type titanium oxide, rutile-type titanium oxide, zinc oxide, zirconium oxide, yellow iron oxide, red iron oxide, black iron oxide, titanium oxide composite mica, zinc oxide composite mica, and iron oxide composite mica. However, it is not particularly limited to these, and those obtained by surface treatment may be used.

  Further, in the present invention, in order to dissolve the solid organic ultraviolet absorber more stably, or to give a feeling of use of cosmetics such as smoothness and moist feeling, other within the range not impairing the effect of the present invention. The ester oil may be contained.

  Specifically, isopropyl myristate, cetyl octanoate, octyldodecyl myristate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyl decyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, stearin Isocetyl acid, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, di Glycerin 2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, tetra-2-ethylene Pentaerythritol trihexanoate, glyceryl tri-2-ethylhexanoate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, tridecyl isononanoate, isononyl isononanoate, diethylhexyl naphthalene dicarboxylate, benzoate Acid (C12-15) alkyl, cetearyl isononanoate, tri (caprylic acid / capric acid) glycerol, (dicaprylic acid / capric acid) butylene glycol, glyceryl trimyristate, tri-2-heptylundecanoic acid glyceride, castor Oil fatty acid methyl ester, oleyl oleate, acetoglyceride, 2-heptylundecyl palmitate, diisobutyl adipate, N-lauroyl-L-glutamic acid-2-octy Dodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, ethylhexyl palmitate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, sebatine Examples include, but are not limited to, diisopropyl acid, di-2-ethylhexyl succinate, ethyl acetate, butyl acetate, amyl acetate, and triethyl citrate.

  In the present invention, a hydrophilic surfactant may be contained in order to improve the emulsion stability.

  Specifically, sodium stearoyl lactate, polyglyceryl-6 stearate, decaglyceryl-10 distearate, PEG-6 sorbitan oleate, PEG-20 sorbitan beeswax, sorbitan isostearate, steareth-8, beheneth-10, laureth-10 , Ceteth-6, ceteth-7, oleth-7, oleth-8, PEG-8 glyceryl isostearate, choles-10, PEG-30 glyceryl triisostearate, PEG-30 glyceryl trioleate, PEG-30 triisostearate Trimethylolpropane, PEG-30 hydrogenated castor oil laurate, PEG-30 hydrogenated castor oil dilaurate, octyldecess-10, PEG-12 dilaurate, polyglyceryl-10 diisostearate, diisostearate PEG-20 glyceryl, PEG-8 isostearate, PEG-10 glyceryl isostearate, PEG-60 hydrogenated castor oil, PEG-20 hydrogenated castor oil, PPG-4 ceteth-10, PPG-2-decession- 7, oleth-10, hydrogenated dimerino linoles-20, palm fatty acid sorbitan, isosteares-10, steareth-11, trimyristate PEG-40 hydrogenated castor oil, PCA isostearic acid PEG-40 hydrogenated castor oil, laureth -7, isocetes-10, ceteth-10, PEG-10 isostearate, PEG-10 stearate, PEG-10 oleate, PEG-10 glyceryl stearate, oleth-12, decyltetradeceth, choles-15, dilaurin Acid PEG-16, PEG-30 hydrogenated castor Oil, PEG-30 castor oil, PEG-40 hydrogenated castor oil triisostearate, PEG-40 glyceryl trioleate, PEG-40 triisostearate trimethylolpropane, PEG-40 hydrogenated castor oil laurate, PEG isostearate -50 hydrogenated castor oil, laureth-9, PPG-2-deceth-10, ceteth-12, PEG-12 isostearate, PEG-15 isostearate, octyldedec-16, PEG-20 dilaurate, PEG30-diisostearate Glyceryl, PEG-40 hydrogenated castor oil, PEG-40 castor oil, PEG-50 glyceryl triisostearate, PEG-50 glyceryl trioleate, PEG-50 triisostearate PEG-50, trimethylolpropane laurate, PEG-5 laurate 0 hydrogenated castor oil, laureth-10, isosteares-15, ores-15, steareth-15, decyltetradeceth-20, choles-20, hydrogenated dimerinolinoles-30, PCA isostearic acid PEG-60 hydrogenated Castor oil, PEG-15 glyceryl stearate, Behenes-20, PPG-2-decess-12, Isoceteth-15, Cetes-15, Octyldecess-20, Colles-24, PEG-50 hydrogenated castor oil, PEG-50 castor Oil, PEG-60 glyceryl triisostearate, PEG-60 glyceryl trioleate, PEG-60 hydrogenated castor oil, laurate-12, PPG-2-deceth-15, ceteth-17, isosteares-20, oleth- 20, steareth-20, PEG-20 glyceryl isostearate Decyltetradeceth-25, hydrogenated dimer dilinoles-40, lauric acid PEG-12, laureth-15, isoceteth-20, ceteth-20, isostearic acid PEG-20 glyceryl, stearic acid PEG-20 glyceryl, stearic acid PEG-20, polysorbate 80, oleth-23, octyldedes-25, PEG-25 glyceryl isostearate, behenez-30, choles-30, PEG-60 hydrogenated castor oil, sorbes hexastearate-150, PPG-2-decess -20, isosteares-25, steareth-25, glyceres-25 PCA isostearate, PEG-60 glyceryl diisostearate, ceteth-25, laureth-20, PEG-20 sorbitan cocoate, isocetes-25, ceteth-30, Tearless-30, PEG-30 stearate, PEG-30 glyceryl isostearate, PEG-30 glyceryl stearate, hydrogenated dimerino linoles-60, PEG-80 hydrogenated castor oil, PEG-40 glyceryl isostearate, PEG- 100 castor oil, tri (c12-15) pares-10 phosphate, PEG-20 sorbitan isostearate, polysorbate 80, sorbes-6 laurate, PEG-20 phytosterol, polysorbate 40, polyglyceryl-10 isostearate and the like. However, it is not particularly limited to these.

  In addition, the cosmetics of the present invention include fats, waxes, hydrocarbons, fatty acids, ether oils, silicone oils, which are components contained in ordinary cosmetics, as long as the effects of the present invention are not impaired as necessary. , Fluorine oil, polyhydric alcohol, saccharide, water-soluble polymer, moisturizer, preservative, pH adjuster, antioxidant, sequestering agent, dye, fragrance, plasticizer, organic solvent, drug, animal and plant extracts, An extender powder, an organic color material, an inorganic color material, a pearl pigment, a surface-treated powder, a composite pigment, an amino acid and a peptide, a vitamin, and the like can be appropriately contained, but are not particularly limited thereto.

  The cosmetic of the present invention is useful because it can provide a freshly used cosmetic while stably containing a hardly soluble solid organic ultraviolet absorber.

  Next, the cosmetics of the present invention will be described in detail with reference to examples, but the present invention is not limited thereto.

  In order to determine the appropriate content of synthetic stevensite, a sunscreen cream was prepared with the following formulation.

Ingredient name Content (wt%)
(1) Polyglyceryl pentastearate-10 1.6
(2) Sodium stearoyl lactate 0.4
(3) Behenyl alcohol 2.0
(4) Stearyl alcohol 0.5
(5) Isotridecyl isononanoate 10.0
(6) Octocrylene 3.0
(7) 4-tert-butyl-4'-methoxydibenzoylmethane 5.0
(8) Synthetic stevensite described in Table 1 (9) Purified water Residual (10) 1,3-butylene glycol 5.0
(11) 1,2-pentanediol 1.0
(12) Xanthan gum 0.5
(13) Polyglyceryl isostearate-10 1.0

  Components (1) to (7) were dissolved by heating to obtain an oil phase, and components (8) to (13) were mixed and dispersed to obtain an aqueous phase. The oil phase heated to 80 ° C. and the aqueous phase heated to 85 ° C. were mixed and emulsified using a homogenizer. After emulsification, the homogenizer was stopped and cooled to 35 ° C. while gently stirring to obtain each sunscreen cream.

  The content of component (8) synthetic stevensite was changed to 0.01, 0.05, 0.1, 0.3, 0.7, 1.0, 2.0, 4.0, and the emulsion stability and pH were changed. evaluated.

<Evaluation method>
Emulsification stability was evaluated by visual observation and microscopic observation immediately after the main emulsification and one month later.

<Judgment>
As for the emulsion stability, in the microscopic observation, when there is almost no difference in the emulsified particles compared with immediately after the main emulsification and after one month, ◎, and when the particle size of the emulsified particles is slightly changed, ○, emulsification The particle size of the particles was clearly doubled or more but the emulsified state was maintained, and the case where the crystal precipitation, the emulsification of the emulsified particles, and the oil phase oozed out visually was marked as x.

  In consideration of the fact that human skin is weakly acidic, the pH is in the range of 5 to 8, and the others are x.

  In Comparative Example 1 containing 0.01% by weight of synthetic stevensite, sufficient emulsification stability could not be imparted. The synthetic stevensite content necessary for imparting good emulsion stability is 0.05% by weight or more. Further, in Comparative Example 2 containing 4% by weight of synthetic stevensite, since the pH exceeded 8, the content of appropriate synthetic stevensite is 2% by weight or less.

Further, the concentration range of the synthetic stevensite having particularly good emulsification stability and suitable pH is preferably 0.3 to 0.5% by weight.

  Next, in order to determine an appropriate content of the solid organic ultraviolet absorber, a sunscreen cream was prepared according to the following formulation.

Ingredient name Content (wt%)
(1) Polyglyceryl stearate-10 1.6
(2) Sodium stearoyl lactate 0.4
(3) Behenyl alcohol 2.0
(4) Stearyl alcohol 0.5
(5) Isotridecyl isononanoate 10.0
(6) Octocrylene 5.0
(7) 4-tert-butyl-4'-methoxydibenzoylmethane described in Table 2 (8) hexyl diethylaminohydroxybenzoylbenzoate described in Table 2 (9) synthetic stevensite 0.3
(10) Purified water Residual (11) 1,3-butylene glycol 10.0
(12) 1,2-pentanediol 1.0
(13) Xanthan gum 0.5
(14) PEG-6 sorbitan oleate 1.5

  Components (1) to (8) were dissolved by heating to obtain an oil phase, and components (9) to (14) were mixed and dispersed to obtain an aqueous phase. The oil phase heated to 80 ° C. and the aqueous phase heated to 85 ° C. were mixed and emulsified using a homogenizer. After emulsification, the homogenizer was stopped and cooled to 35 ° C. while gently stirring to obtain each sunscreen cream.

<Evaluation method>
Emulsification stability was evaluated by visual observation and microscopic observation immediately after the main emulsification and one month later.

<In vitro UVAPF>
Evaluation of UV protection ability in the UVA region was performed by calculating UVAPF, which is an index of UV protection ability in the UVA region, according to COLIPA guidelines (METHOD FOR THE VITRO DETERMINATION OF UVAPROTECTION PROVIDED BY SUNSCREENPRODUCTTS, 2007).

  In this evaluation, a surgical tape (3M Blender ™ Tape 152J-2) was substituted for the acrylic plate on which the cosmetic material was applied.

<Judgment>
As for the emulsion stability, in the microscopic observation, when there is almost no difference in the emulsified particles compared with immediately after the main emulsification and after one month, ◎, and when the particle size of the emulsified particles is slightly changed, ○, emulsification The particle size of the particles was clearly doubled or more but the emulsified state was maintained, and the case where the crystal precipitation, the emulsification of the emulsified particles, and the oil phase oozed out visually was marked as x.

  With respect to UVA protective ability of UVA, UVAPF is 4 or more, ◎, 2 or more and less than 4 is ◯, 1 or more and less than 2 is Δ, and less than 1 is ×. In addition, UVAPF measurement was not implemented for the emulsion stability evaluation of x.

  From the above results, the content of the solid organic ultraviolet absorbent necessary for maintaining the emulsified state while providing sufficient UV protection in the UVA region is 10% by weight or less, and a particularly high UVAPF is formulated. 4 to 7% by weight is preferable.

  Next, in order to determine an appropriate content of the liquid organic ultraviolet absorber, a sunscreen cream was prepared according to the following formulation.

Ingredient name Content (wt%)
(1) Polyglyceryl stearate-10 1.6
(2) Sodium stearoyl lactate 2.0
(3) Behenyl alcohol 2.0
(4) Stearyl alcohol 0.5
(5) Isotridecyl isononanoate 10.0
(6) Octocrylene described in Table 3 (7) octyl methoxycinnamate described in Table 3 (8) hexyl diethylaminohydroxybenzoyl benzoate 6.0
(9) Synthetic stevensite 0.1
(10) Purified water Residual (11) 1,3-butylene glycol 10.0
(12) 1,2-pentanediol 1.0
(13) Xanthan gum 0.5

  Components (1) to (8) were dissolved by heating to obtain an oil phase, and components (9) to (13) were mixed and dispersed to obtain an aqueous phase. The oil phase heated to 80 ° C. and the aqueous phase heated to 85 ° C. were mixed and emulsified using a homogenizer. After emulsification, the homogenizer was stopped and cooled to 35 ° C. while gently stirring to obtain each sunscreen cream.

<Evaluation method>
Emulsification stability was evaluated by visual observation and microscopic observation immediately after the main emulsification and one month later.

  The UV protective ability evaluation in the UVB region was estimated by the following in vitro SPF measurement.

  The feeling of use was evaluated by three professional panelists, and the evaluation of emulsification stability was evaluated for those with x.

<In vitro SPF>
The light source is an XB-25IWI solar simulator manufactured by WACOM, and the transmitted UV intensity is measured using a UVR-305 / 365-D (2) UV intensity meter manufactured by TOKYO OPTICAL. did. The distance from the light source to the UV intensity meter was about 30 cm, and the sample set between them was about 27 cm from the light source, and was sufficiently fixed so that no deviation occurred during the measurement.

  The measurement sample was prepared by applying a 3M Blender Surgical Tape to a slide frame about 5 cm square and uniformly applying 0.01 g of the measurement sample.

  For measurement, the ultraviolet transmission intensity Ib of the surgical tape affixed to the frame was used as a blank, the ultraviolet transmission intensity I after the sample application was measured, and then the ultraviolet blocking rate {(Ib-I) / Ib} × 100 (%) was calculated. did. This calculation result was collated with a calibration curve plotted by UV blocking rate and SPF based on known data, and the SPF of each powder foundation was estimated in vitro.

  The feeling of use was evaluated by three professional panelists, and the evaluation of emulsification stability was evaluated for those with x.

<Judgment>
As for the emulsion stability, in the microscopic observation, when there is almost no difference in the emulsified particles compared with immediately after the main emulsification and after one month, ◎, and when the particle size of the emulsified particles is slightly changed, ○, emulsification The particle size of the particles was clearly doubled or more but the emulsified state was maintained, and the case where the crystal precipitation, the emulsification of the emulsified particles, and the oil phase oozed out visually was marked as x.

  As for the UV protection ability in the UVB region, SPF of 20 or more is ◎, 10 or more and less than 20 is ◯, 5 or more and less than 10 is Δ, and less than 5 is x.

  The feeling of use was evaluated as “good” when two or more of the three panelists felt that the cosmetics were smooth and fresh, and “x” otherwise.

  From the above results, in order to give a fresh feeling to use, the content of the liquid organic ultraviolet absorber needs to be 10% by weight or less, and in order to give particularly good emulsion stability and high SPF. 5 to 10% by weight is preferred.

  Next, in order to determine the appropriate content of higher alcohol, a sunscreen cream was prepared with the following formulation.

Ingredient name Content (wt%)
(1) Polyglyceryl stearate-10 1.6
(2) Sodium stearoyl lactate 0.6
(3) Behenyl alcohol described in Table 4 (4) cetyl alcohol described in Table 4 (5) myristyl alcohol described in Table 4 (6) lignoceryl alcohol described in Table 4 (7) isotridecyl isononanoate 10.0
(8) Octocrylene 5.0
(9) 4-tert-butyl-4'-methoxydibenzoylmethane 6.0
(10) Synthetic stevensite 0.2
(11) Purified water Residue (12) 1,3-butylene glycol 10.0
(13) 1,2-pentanediol 1.0
(14) Xanthan gum 0.3
(15) Polyglyceryl isostearate-10 1.0

  Components (1) to (9) were dissolved by heating to obtain an oil phase, and components (10) to (15) were mixed and dispersed to obtain an aqueous phase. The oil phase heated to 80 ° C. and the aqueous phase heated to 85 ° C. were mixed and emulsified using a homogenizer. After emulsification, the homogenizer was stopped and cooled to 35 ° C. while gently stirring to obtain each sunscreen cream.

<Evaluation method>
Emulsification stability was evaluated by visual observation and microscopic observation immediately after the main emulsification and one month later.

  The feeling of use was evaluated by three professional panelists, and the evaluation of emulsification stability was evaluated for those with x.

<Judgment>
As for the emulsion stability, in the microscopic observation, when there is almost no difference in the emulsified particles compared with immediately after the main emulsification and after one month, ◎, and when the particle size of the emulsified particles is slightly changed, ○, emulsification The particle size of the particles was clearly doubled or more but the emulsified state was maintained, and the case where the crystal precipitation, the emulsification of the emulsified particles, and the oil phase oozed out visually was marked as x.

  The feeling of use was evaluated as “good” when two or more of the three panelists felt that the cosmetics were smooth and fresh, and “x” otherwise.

  From the above results, in order to give good emulsification stability and usability, the content of higher alcohol having 16 to 22 carbon atoms needs to be 0.1 to 5% by weight, particularly 0.5 to 3% by weight is preferred.

  A sunscreen cream was then prepared with the following formulation in order to determine the appropriate content of lipophilic surfactant.

Ingredient name Content (wt%)
(1) Polyglyceryl stearate-10 described in Table 5 (2) Sodium stearoyl lactate 1.0
(3) Behenyl alcohol 2.0
(4) Stearyl alcohol 0.5
(5) Isotridecyl isononanoate 10.0
(6) Octocrylene 5.0
(7) Diethylaminohydroxybenzoyl hexyl benzoate 5.0
(8) Synthetic stevensite 0.3
(9) Purified water Residual (10) 1,3-butylene glycol 10.0
(11) 1,2-pentanediol 1.0
(12) Xanthan gum 0.5
(13) Polyglyceryl isostearate-10 1.0

  Components (1) to (7) were dissolved by heating to obtain an oil phase, and components (8) to (13) were mixed and dispersed to obtain an aqueous phase. The oil phase heated to 80 ° C. and the aqueous phase heated to 85 ° C. were mixed and emulsified using a homogenizer. After emulsification, the homogenizer was stopped and cooled to 35 ° C. while gently stirring to obtain each sunscreen cream.

<Evaluation method>
Emulsification stability was evaluated by visual observation and microscopic observation immediately after the main emulsification and one month later.

  The feeling of use was evaluated by three professional panelists, and the evaluation of emulsification stability was evaluated for those with x.

<Judgment>
As for the emulsion stability, in the microscopic observation, when there is almost no difference in the emulsified particles compared with immediately after the main emulsification and after one month, ◎, and when the particle size of the emulsified particles is slightly changed, ○, emulsification The particle size of the particles was clearly doubled or more but the emulsified state was maintained, and the case where the crystal precipitation, the emulsification of the emulsified particles, and the oil phase oozed out visually was marked as x.

  The feeling of use was evaluated as “good” when two or more of the three panelists felt that the cosmetics were smooth and fresh, and “x” otherwise.

  From the above results, the content of the lipophilic surfactant of HLB 6 or less necessary for improving the emulsion stability and usability is 0.5 to 5% by weight, and particularly preferably 1 to 3% by weight.

A sunscreen cream was then prepared with the following formulation to determine the appropriate content of the aqueous phase.
Ingredient name Content (wt%)
(1) Polyglyceryl stearate-10 1.5
(2) Sodium stearoyl lactate 1.5
(3) Behenyl alcohol 2.0
(4) Stearyl alcohol 1.0
(5) Isotridecyl isononanoate listed in Table 6 (6) Octocrylene 10.0
(7) Diethylaminohydroxybenzoyl hexyl benzoate 4.0
(8) Synthetic stevensite 0.3
(9) Purified water Residual (10) 1,3-butylene glycol 10.0
(11) 1,2-pentanediol 1.0
(12) Xanthan gum 0.5

  Components (1) to (7) were dissolved by heating to obtain an oil phase, and components (8) to (12) were mixed and dispersed to obtain an aqueous phase. The oil phase heated to 80 ° C. and the aqueous phase heated to 85 ° C. were mixed and emulsified using a homogenizer. After emulsification, the homogenizer was stopped and cooled to 35 ° C. while gently stirring to obtain each sunscreen cream.

<Evaluation method>
Emulsification stability was evaluated by visual observation and microscopic observation immediately after the main emulsification and one month later.

<Judgment>
As for the emulsion stability, in the microscopic observation, when there is almost no difference in the emulsified particles compared with immediately after the main emulsification and after one month, ◎, and when the particle size of the emulsified particles is slightly changed, ○, emulsification The particle size of the particles was clearly doubled or more but the emulsified state was maintained, and the case where the crystal precipitation, the emulsification of the emulsified particles, and the oil phase oozed out visually was marked as x.

  From the above results, in order to give good emulsification stability, the content of the aqueous phase is preferably 60 to 80% by weight.

Next, as an example using a higher alcohol having an ether bond (batyl alcohol), a sunscreen cream was prepared according to the following formulation.
Ingredient name Content (wt%)
(1) Polyglyceryl stearate-10 1.5
(2) Sodium stearoyl lactate 1.0
(3) Batyl alcohol 1.0
(4) Isotridecyl isononanoate 10.0
(5) Octocrylene 5.0
(6) Diethylaminohydroxybenzoyl hexyl benzoate 5.0
(7) Synthetic stevensite 0.3
(8) Purified water residue (9) 1,3-butylene glycol 10.0
(10) 1,2-pentanediol 1.0
(11) Xanthan gum 0.5
(12) Polyglyceryl isostearate-10 1.0

  Components (1) to (6) were dissolved by heating to obtain an oil phase, and components (7) to (12) were mixed and dispersed to obtain an aqueous phase. The oil phase heated to 80 ° C. and the aqueous phase heated to 85 ° C. were mixed and emulsified using a homogenizer. After emulsification, the homogenizer was stopped and cooled to 35 ° C. while gently stirring to obtain each sunscreen cream.

  The obtained sunscreen cream was a cosmetic having a high UV protection ability over a wide wavelength range from UVA to UVB, no crystal precipitation, and a fresh feeling of use.

The technique used in the cosmetic of the present invention is a technique that provides a fresh feeling of use while stably containing a hardly soluble solid organic ultraviolet absorber. This is not limited to organic UV absorbers, it is a technology that dissolves poorly soluble drugs, in particular drugs having an aromatic molecular skeleton, with a solvent and stably contains them in the formulation without precipitation of crystals. There is a potential for development.

Claims (4)

As a component,
1) Synthetic stevensite 0.3-0.5 wt%
2) One to two organic ultraviolet absorbers selected from hexyl diethylaminohydroxybenzoyl benzoate and 4-tert-butyl-4'-methoxydibenzoylmethane 4 to 7% by weight
3) 5 to 10% by weight of one or two organic ultraviolet absorbers selected from octyl methoxycinnamate and octocrylene
4) One or two or more higher alcohols having 16 to 22 carbon atoms 0.1 to 5% by weight
5) 0.5-5% by weight of polyglyceryl-10 pentastearate
Oil-in-water emulsified cosmetic containing The oil-in-water emulsified cosmetic according to claim 1 , wherein the content of component 4) is 0.5 to 3% by weight. The oil-in-water emulsified cosmetic according to claim 1 or 2 , wherein the content of component 5) is 1 to 3% by weight. The oil-in-water emulsified cosmetic according to any one of claims 1 to 3 , wherein the content of the aqueous phase is 60 to 80% by weight.