JPS60149517A - Anti-sunburn composition - Google Patents

Abstract

PURPOSE:To provide an anti-sunburn cosmetic containing a pigment coated with a polyvalent metal salt of p-methoxycinnamic acid, and having extremely high ultraviolet-shielding capability, high transparent feeling, good durability on the skin, and excellent dispersability and stability. CONSTITUTION:The objective anti-sunburn cosmetic contains a pigment (e.g. talc, titanium oxide, titanium mica, magnesium silicate, nylon, polypropylene, etc.) coated with a compound of formula (M is Al, Mg, Zn, Ca or Zr; n is atomic valence of M). The anti-sunburn cosmetic is free of permeation into the skin, has extremely excellent spreadability and color-developability, and is resistant to degradation with time on the skin. The coated pigment can be prepared by dispersing a pigment in an aqueous solution of a water-soluble polyvalent metal salt, adding an aqueous solution of an alkali metal salt of p-methoxycinnamic acid slowly and dropwise to the suspension under agitation, making the mixture alkaline, and continuing the agitation. The amount of the compound of formula applied to the pigment is 1-30wt% based on the pigment.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sunscreen cosmetic containing a pigment whose surface has been substantially treated with an ultraviolet absorbing substance. More specifically, by containing a polyvalent metal salt of paramethoxycinnamic acid-coated pigment in which the surface of the pigment is substantially coated with a polyvalent metal salt of paramethoxycinnamic acid, it has extremely low ultraviolet ray blocking ability. The present invention relates to a sunscreen cosmetic that also has excellent transparency, makeup retention, dispersibility, and stability.

Conventionally, UV-cutting substances added to cosmetics include:
Synthetic ultraviolet absorbers such as paramethoxycinnamic acid, benzophenone derivatives, cinnamic acid derivatives, benzotriazole derivatives, and salicylic acid derivatives, and inorganic pigments such as titanium oxide, zinc oxide, and iron oxide are included. The former type of organic UV absorber causes problems with solubility, texture (e.g. stickiness), etc. when added to the base when added to cosmetics, and also reduces transparency to the skin and absorption capacity due to UV absorption. As a cosmetic raw material, there are problems such as deterioration and coloring.

On the other hand, the latter inorganic pigments are not absorbed through the skin, so there are no safety issues, but if they are blended in high concentrations to have effective UV blocking ability, the blocking power is too high and the skin becomes white when applied. It can be difficult to achieve a natural finish as it may be too pigmented or stiff. Furthermore, regarding makeup linger, which is very important as a sunscreen cosmetic, it has shortcomings in adhesion to the skin (adhesiveness) and water resistance, making it impossible to achieve sufficient effects. Furthermore, fine particle titanium oxide (Special Publication No. 47-4250) was developed to improve these points.
2), blending of fine particles of zinc oxide, etc. and their hydrophobic treatment (for example, metal soap treatment, JP-A-58-49307;
Pigment blending technology (silicon baking treatment) also has problems such as agglomeration of fine pigment particles, poor color tone, blueness due to interference color, blackening due to ultraviolet absorption) and decreased ultraviolet blocking ability.
! Cosmetics that have a natural makeup effect (finish) and have sufficient sun protection effects have not yet been produced.

As a result of intensive research aimed at solving the problems of the conventional methods described above, the present invention has been developed as a result of extensive research to solve the problems of the conventional methods described above. It solves various problems and has extremely high UV-cutting ability,
Based on this knowledge, we discovered that it has no skin permeability, is extremely safe, and exhibits extremely excellent properties such as transparency, makeup retention (adhesion), spreadability, dispersibility, stability, and color development. The invention has been completed.

The purpose of the present invention is to have an extremely excellent sun protection effect, excellent transparency, and natural color tone by blending a pigment coated with a polyvalent metal salt of rosemethoxycinnamic acid. To provide a sunscreen cosmetic that has very good adhesion to the skin and does not lose its makeup over time.

That is, in the present invention, the particle surface of the base pigment has the following formula +21 (wherein, M is ^l+ Mg+ Zn+ Ca or Z
r, n are the valences of M) A polyvalent metal salt of paramethoxycinnamic acid-coated pigment is substantially coated with a polyvalent metal salt of paramethoxycinnamic acid represented by: It is a sunscreen cosmetic.

The polyvalent metal salt of rosemethoxycinnamic acid-coated pigment of the present invention comprises:
The particle surface of the pigment (base pigment) is substantially coated with the polyvalent metal salt of paramethoxycinnamic acid, and the coating state is substantially uniform.

Examples of the polyvalent metal salts of paramethoxycinnamic acid include aluminum salts, magnesium salts, zinc salts, calcium salts, and zirconium salts of paramethoxycinnamic acid. These chemical printing formulas are as follows.

In addition, these polyvalent metal salts of paramethoxycinnamic acid are harmful to the skin in the UV-B region (280 to 320 nm).
) has a significantly high ultraviolet absorption capacity, as shown in Table 1.

Table 1 Transmission spectrum transmittance (%) of polyvalent metal salt of paramethoxycinnamic acid (nml) of the present invention
Aljji Mg salt Zn salt Ca salt Zr salt 270
13 1 0 0 20 275 10 0 0 0 15 280 6 0 0 0 10 2F+5 3 0 0 0 2 2! + 11 2 11 0 (I I2E+5 1
0 0 0 1 300 1 0 0 0 1 305 1 0 0 0 1 31θ 20001 315 3 1 0 0 2 320 6 1 0 0 6 Note 1) Transmission type spectrum is self-recording spectrophotometer g1M P S - manufactured by Takafusa Seisakusho. Using Model 2000, a sample compound was suspended in ethanol in a 0.02 star shape and subjected to ultrasonication for 5 minutes, followed by measurement using a 10 m cell.

The amount of the polyvalent metal salt of paramethoxycinnamic acid that coats the particle surface of the base pigment is 0.1 based on the weight of the base pigment.
~40% deep view, dish shape or 1~30% deep view, dish shape. If the amount is less than one monomer, the particle surface of the base pigment will not have a substantially covered structure, resulting in good adhesion, spreadability, dispersibility, covering power, durability of cosmetic effect, miscibility, ultraviolet absorption, It is difficult to impart sufficient anti-sun effect and feel, and if the number exceeds 40 layers, the base pigment particles may coagulate with each other, which may reduce the covering power of the pigment. .

The maximum particle size of the polyvalent metal salt-coated pigment of paramethoxycinnamic acid of the present invention is 100 μm or less; if the particle size is larger than this, the adhesion and affinity for the skin deteriorate, and it becomes felt as a foreign substance.

The base pigment in the coated pigment of the present invention is a general term for white pigments, colored pigments, extender pigments, etc. for cosmetics, and examples include talc, kaolin, mica, calcium carbonate, titanium oxide, zinc oxide, titanium mica, and magnesium carbonate. , iron oxides, iron oxide-treated mica titanium, aluminum oxide, aluminum silicate, barium sulfate, bismuth oxychloride, diW
Examples include powders of synthetic resins such as IJ silicon, magnesium silicate, nylon, polyethylene, Teflon, and polypropylene, and these may be used alone or in combination of two or more.

The polyvalent metal salt of paramethoxycinnamic acid coated pigment of the present invention has a fine structure in which the particle surface of the base pigment is substantially covered with the polyvalent metal salt of paramethoxycinnamic acid, and is in the form of fine powder. . The state of the coating is recognized by scanning and transmission electron microscopy.

Polyvalent metal salt of paramethoxycinnamic acid - The polyvalent metal salt of paramethoxycinnamic acid that forms the surface layer (coating layer) of the coated pigment is insoluble in water, organic solvents, oily substances, and sebum, and is in a so-called pigment state. Therefore, it is not absorbed through the skin (skin permeation), does not cause skin irritation to the human body, and is extremely safe. It has oil absorption and heat resistance.

Therefore, the polyvalent metal salt of paramethoxycinnamic acid-coated pigment is
It is extremely safe for the human body, and in terms of UV protection, it shows a synergistic effect with the pigment's inherent UV reflection ability, exhibiting extremely high UV protection ability, and at the same time improving transparency and makeup. Mochi (adhesion), growth 1! It exhibits extremely excellent properties such as stability, safety, and color development, and is extremely useful as a base for sunscreen cosmetics.

Moreover, it does not have the disadvantages of conventional cosmetic pigments, such as dehydration, degreasing, dryness, and alkalinization of the skin surface, and can protect the skin in a healthy manner.

Therefore, sunscreen cosmetics containing this coated pigment are
It exhibits extremely high UV power, has good spreadability (extensibility) and adhesion (adhesion) to the skin, and also has good feel when applied, makeup finish after application, makeup durability, and water resistance. Good, desirable and beautiful cosmetic effects can be developed and maintained.

The polyvalent metal salt of paramethoxycinnamic acid coated pigment used in the present invention is produced, for example, in the following manner.

The base pigment is 0.1 to 20% based on its weight.
After suspending the water-soluble polyvalent metal salt in an aqueous solution containing a dish-shaped or 0.5 to 5-fold dish-shaped water-soluble polyvalent metal salt, 1 to 4 equivalents of the water-soluble polyvalent metal salt are added to this under frequent stirring. 0, 01-20 weight percent containing alkali methoxycinnamic acid salt, dish-shaped or 0
．． Gradually add dropwise the 5-5 layered dish-shaped aqueous solution, and after the addition is complete,
Adjust the pH of the reaction solution to alkaline side, and continue for 20 minutes to 2 hours.
Time + j! As the stirring is continued, the polyvalent metal salt of baramethoxycinnamic acid is sequentially aligned and adsorbed onto the surface of the base pigment. The target coated pigment is isolated from the reaction mixture by filtering the reaction mixture to remove the polyvalent metal salt of baramethoxycinnamic acid-coated pigment, and then thoroughly washing the precipitate with water to precipitate it. Completely remove unreacted alkali salt of rosemethoxycinnamic acid and the polyvalent metal salt adhering to the object. After this washing step, it may be dried and, if necessary, ground.

The thus obtained polyvalent metal salt-coated pigment of the present invention has a Fourier transform infrared absorption (FT-IR).
Analysis by I-spectrum and observation by electron microscopy revealed that the pigment surface was uniformly coated with polyvalent metal salt of paramethoxycinnamic acid.

The effects of the polyvalent metal salt of paramethoxycinnamic acid coated pigment used in the present invention will be shown below using Examples. In the examples, parts mean parts by weight, and % means weight %. The measure of sun protection effectiveness is the SPF value (Sun Protect
ion Factor) was used. The spF value is the minimum erythema EiE generation energy Ea when a cosmetic sample of 1 CIIr/tCo2 + ng is uniformly applied to the backs of 20 panelists, and the minimum erythema generation energy Ea when the cosmetic sample is not applied at all. It was determined from the comparison with energy Ec.

SPF value=Ea/Ec In the measurement, five Toshiba FL-203E-30 lamps were connected to an M-DMl type ultraviolet irradiation device for clothing manufactured by Toshiba Apparel Products Co., Ltd., and irradiation was performed from a distance of 15c+n. The irradiation energy was measured using a purple ray intensity meter (UVR-305/365) manufactured by Toshiba Optical Machinery Co., Ltd. (In addition, S
The definition of PF value is Fed@ral Register
43. (166), 38206-38269 (1
978) Statement Example 1 Suncut pressed powder - Present invention Comparative example 12 A is mixed with a Henshi or Lumixer, B is added and the powder is stirred and ground, then the mixture is used as the mold volume and molded. Product.

The sun protection effects and sensory test results (by 20 panelists) of the present composition and Comparative Examples 1 and 2 are as follows.

Present invention Comparative example 12 Sun protection effect 1663 (SPF value) Spreading on skin 4.7 2.6 4.6 Lucent feeling
4.7 4.74.7 Makeup finish 4.8 g, 2 2.8 Adhesion 4.7
3.2 2.7 Make-up fading 4.7 3.6 2.5 Water resistance 4.8 4.1 2.1 Oiliness 4.7 2.5 4.3 (Note) The items listed in the table are The numerical value shown is the evaluation score for the relevant effect of the test item. and very good 5
, 4 is good, 3 is average, 2 is bad, and 1 is very poor.This is the average of the total scores of the 20 panelists in this case.

As described above, the composition of the present invention has cosmetic effects (spreading on the skin, lucent feeling, adhesion, makeup fading, makeup finish,
It is also loved in terms of water resistance and oiliness.

Example 2 Sunscreen cream foundation bag (Wl
o) Invention Comparative Example D Perfume 0.2 0.2 C is uniformly ground. Add A dissolved at 75°C to B dissolved at 70°C to emulsify, add C and D at 60°C, cool to 34°C, and fill in a container to obtain a product.

The sun protection effects and sensory test results (by 20 panelists) of the present composition and comparative examples are as follows.

Present invention Comparative example Sun protection effect (SPF value) 177 Spreading on skin 4. '6'4.2 Lucent feeling 4. '? s4','i"makeup ruined 4
．． 5 3.2 Makeup finish 4.4 4.0 Water resistance 4.8 3. As shown in Figure 2, the composition exhibited remarkable sun protection effect, water resistance, and resistance to fading compared to the comparative example.

Example 3 Anti-tanning lipstick of the present invention Comparative Example A was dissolved at about 80° C., B was added thereto and mixed uniformly, and the mixture was kneaded with a roller and poured into a mold to form a product.

The sun protection effect and sensory test results (by 20 panelists) of this composition are as follows.

Present invention Comparative example Sun protection effect 82 (SPF value) Adhesion to skin 4.5 3.6 Lucent feel 4.2 3.6 Makeup finish 4.4 3.8 Unnatural feeling 4.5 3.2 Makeup fading 4.62.8 Water resistance 4.8 4.2 In this way, the present composition (well, compared to the comparative example, shows remarkable sun protection effect, excellent water resistance, and makeup fading resistance, Also, regarding the strange feeling, Example 4: Cake foundation that prevents sun tanning This invention Comparative example 12 A was mixed and stirred with a Henschel mixer, B was uniformly dissolved and mixed, and then added to A. After mixing and pulverizing for a while, The product is filled into a molded container and molded.

The sun protection effects and sensory test results (by 20 panelists) of the present composition and Comparative Examples 1 and 2 are as follows.

Present invention Comparative example 12 Sun protection effect 2177 (SPF value) Spreading on skin 4.6 3.8 3.9 Lucent feeling
4.3 4.2 4.1 Adhesion 4.8 3.2 3.
6 Makeup fading 4.7 2.7 2.8 Makeup finish 4.5 3.6 3.5 Water resistance 4.8
3.2 3.4 Oiliness 4.5 4.5 ' 2.5 Thus, compared to the comparative example, the present composition showed remarkable sun protection effect, water resistance, and resistance to makeup deterioration. Ta.

Example 5 Sunscreen lotion of the present invention Comparative example 12 Aluminum paramethoxycinnamate N 4.0 - -
Fine particle titanium oxide (coverage rate 10%) Fine particle titanium oxide treated with zinc myristate -4,0-(
Coverage rate 2%) 2-Ethylhexyl para S゛
Polyethylene curing oil (60E, 0.) 0.5
0.5 0.5 Propylene glycol 4.0 4.
0 4.0 Fragrance 0.1 0.1 0.1 Pure water 75.4 75.4 75.4 V, L extra 1 white Invention Comparative Example 12 Product Appearance Pigment is uniformly dispersed and aggregates Oil droplets are formed and do not easily settle Sunburn prevention effect 3 1 1 (SPF4ti) Oiliness 4.7 4.5 2.6 Water resistance Properties 4.7 4.1 3.2 As described above, the present composition exhibited a remarkable sunscreen prevention effect and excellent organoleptic properties compared to the comparative example.

Claims (1)

[Claims] (11 The particle surface of the base pigment is baramethoxycinnamic acid represented by the following formula +11 (in the formula, Ml! AI + Mg + Z + s + Ca or Zr, n is the valence of M) A sunscreen cosmetic comprising a polyvalent metal salt of baramethoxycinnamic acid-coated pigment which is substantially coated with a polyvalent metal salt of (2) the base pigment is talc, mica, Inorganic pigments such as kaolin, titanium oxide, zinc oxide, iron oxide, silicon dioxide, aluminum oxide, aluminum silicate, titanium mica, titanium mica treated with iron oxide, magnesium carbonate, calcium carbonate, barium sulfate, bismuth oxychloride, magnesium silicate, etc. The sunscreen cosmetic according to claim 1, which is a powder of synthetic ams such as Naipun, polyethylene, Teflon, polypropylene, methyl methacrylate, etc.