KR20050044116A - Cosmetic raw materials with improved feeling of use, their preparation method and cosmetics comprising them - Google Patents

Abstract

The present invention relates to a cosmetic raw material, and provides a method for preparing a cosmetic raw material containing an inorganic material by coating an inorganic powder such as TiO ₂ , SiO ₂ or ZnO on the surface of the polymer bead. According to the present invention, while having the functional characteristics such as UV protection effect, whitening effect, absorption of absorption and light stability of the inorganic powder, the low usability of the inorganic powder is improved and chemically and physically stable cosmetic raw material and cosmetics using the same can do.

Description

Cosmetic Raw Material with Improved Feeling, Manufacturing Method and Cosmetics Using the Same {Cosmetic Raw Materials With Improved Feeling of Use, Their Preparation Method and Cosmetics Comprising Them}

The present invention relates to a cosmetic raw material, and more particularly, by coating an inorganic powder such as TiO ₂ , SiO ₂ or ZnO on the surface of the polymer bead, UV protection effect, whitening effect, equity absorption and light stability of the inorganic powder It relates to a raw material that can be used as a raw material of cosmetics having the same functional characteristics and improved usability.

In recent years, the public awareness of the need to apply a suitable light shielding agent in outdoor leisure activities has increased unprecedentedly in the field of manufacturing the light shielding agent. There is also interest in the field of irritation and sensitivity issues that may occur in some users of high SPF sun protection products that include organic light-shielding agents.

It is well known that human skin is sensitive to sunlight and artificial light, including light of wavelengths from about 290 nm to 400 nm. Ultraviolet light (UV-B region) in the wavelength range of about 290 nm to 320 nm is known to rapidly produce deleterious effects on the skin, including reddening or erythema, edema, blisters or other skin rashes in more severe cases. Continuous or chronic exposure to light in this wavelength range involves skin conditions such as ultraviolet keratosis and cancer. In recent years, attention has also been directed to the adverse effects of ultraviolet rays above the 320 nm wavelength (UV-A region) and the light on human skin. Rays of 320 to 400 nm cause premature aging of the skin. In addition, recent studies have shown that chronic sun exposure limits the skin's immune response.

Therefore, in order to prevent this, the cosmetics which mix | blended ultraviolet scattering agents, such as a ultraviolet absorber and powder, are currently used. Ultraviolet scattering agents here include organic materials, but organic light blocking agents can cause irritating and sensitive reactions. To overcome this, a method of incorporating physical sunscreen agents, i.e. inorganic compounds such as zinc oxide and titanium dioxide, has been attempted. Examples in which inorganic particulate compounds such as titanium dioxide are used as sunscreen agents are disclosed in US Pat. Nos. 5,215,749 and 5,188,831. Pigments with high refractive index, such as titanium dioxide and zinc oxide, are physical devices that scatter UV rays and block it.

However, as the representative titanium dioxide specific gravity of the white pigment has about 4.2g / cc, when it is added to cosmetics, the specific gravity difference with the base is so severe that the titanium dioxide sinks down, which is not good in terms of product stability. At present, in order to stably disperse titanium dioxide, a large amount of surfactant is used, or a lipophilic treatment is used on the surface of titanium dioxide, or the base viscosity is used to be considerably high.

In addition, ultra fine powder inorganic powders such as TiO ₂ (whitening effect, light shielding effect, light stability), ZnO (whitening effect, light shielding effect, light stability), and SiO ₂ (powder absorption, light stability) used as cosmetic inorganic materials In spite of the functional properties of inorganic powders, there are many things that are poor in use as cosmetics because they have strong adhesion to skin and high frictional resistance due to their shape and powder properties. Cosmetic technology is becoming more and more finely differentiated due to the influence of nanotechnology, but as the finely divided inorganic powder, the feeling of use deteriorates and aggregates.

Therefore, its functional properties are achieved using stable (including photostabilization), effective shading products and inorganic powders that provide a safe (skin hypoallergenic) feel and provide broad spectrum UV protection (for example against UVA and UVB irradiation). There is still a need for a cosmetic that feels good to use.

Accordingly, the present inventors have completed the present invention by developing a cosmetic raw material having improved stability and usability in consideration of various problems of the cosmetic raw material composition including the existing organic and inorganic light-shielding agents.

SUMMARY OF THE INVENTION An object of the present invention is to overcome the disadvantages of conventional commercial materials and to provide a method for producing a cosmetic raw material comprising an inorganic material which is safe for human skin and has a good feeling of use.

Another object of the present invention is to provide a cosmetic raw material containing an inorganic substance which is safe for human skin and has a good feeling of use.

Another object of the present invention is to provide a cosmetic containing a cosmetic raw material containing an inorganic substance that is safe and comfortable to human skin.

The above and other objects and features of the present invention will be readily apparent to those skilled in the art through the detailed description given below.

The above object and other features and advantages of the present invention is achieved by a cosmetic raw material containing the inorganic material and having a good feeling of use by coating the inorganic material having a UV protection and whitening effect on the polymer bead. In particular, the present invention relates to a cosmetic raw material containing a coating and containing titanium dioxide and zinc oxide in a specific particle size range as a light shielding and whitening material. The cosmetic raw material is physically stable while having a high SPF value, and cosmetics prepared by containing the improved usability.

The cosmetic raw material of the present invention contains an inorganic substance that can be added to a cosmetic including a certain particle size, that is, titanium dioxide and zinc oxide of about 10-300 nm.

Titanium dioxide useful in the present invention can be produced by well known industrial methods. Zinc oxide is an inorganic substance that normally functions as a white pigment in paints, papers and polymers among other applications. Zinc oxide is also used as a body shading agent in human protective products. Zinc oxide useful in the present invention can be prepared by several methods well known in the chemical art.

The cosmetic raw material of the present invention contains an extender medium such as a carrier or excipient which contains titanium dioxide, zinc oxide and the like as a light-shielding agent or a whitening agent to make the preparation suitable for use on the skin. The cosmetic composition comprising the cosmetic raw material of the present invention may be present in solid, liquid or aerosol form. Cosmetic compositions comprising the cosmetic raw materials of the present invention include creams, lotions, milks, mousses, gels, oils, tonics, sprays, hand and body lotions, cold creams, facial moisturizers, anti-acne preparations, topical analgesics, makeups, lipsticks It can be formulated into various product types, including the like. Topical carriers and additional ingredients necessary for the formulation of such products vary depending on the type of product and may be routinely selected by those skilled in the art.

The object of the present invention is achieved by coating inorganic powder on polymer beads. The method of coating the inorganic powder on the polymer beads is as follows.

1. Dispersion of Polymer Beads

Polymer beads made of dimethicone or vinyl dimethicone having a diameter of 3-15 μm were stirred for 30 minutes using a stirrer (rpm 200) at 10-30% by weight in a solvent. Disperse well in Tetrahydrofuran is preferable as the solvent.

2. Silicone oil added

Silicone oil is added to the dispersion by 1-3 weight percent of the polymer beads and further stirred for 10 minutes to disperse.

3. Coating Addition

TiO ₂ , SiO ₂ or ZnO to be coated on the polymer beads is added as 10-100 weight percent of the polymer beads and reacted with stirring for 20 minutes at room temperature to coat the coating on the polymer beads. The size of the coating agent is preferably 10-300nm in diameter.

4. Filtration and drying

The reaction was filtered with a high pressure or low pressure filter to obtain cake aggregates and dried in a dryer at a temperature of 40-50 ° C. to remove residual solvent.

5. Crushing

Grind using a Henschel mixer or atomizer.

Particular aspects of the invention are illustrated by the following examples. However, the present invention is not limited to the specific limitations described in each embodiment.

Example

Example 1 Preparation of Polymer Beads Coated with TiO ₂

Polymer beads of 3-15 μm diameter vinyl dimethicone were dispersed in tetrahydrofuran at 15 wt% with stirring (rpm 200) for 30 minutes.

Silicone oil was added to the dispersion by 1 weight percent of the polymer beads and dispersed for 10 minutes. TiO ₂ having a diameter of 150 nm was added to the polymer beads at a weight ratio of 2: 3 (67 wt% of the polymer beads) and stirred for 20 minutes at room temperature. Reacted.

The reaction was filtered through a high pressure filter to obtain cake aggregates and dried in a dryer at 45 ° C. to remove residual solvent and triturate with Henschel mixer.

1 is a SEM photograph of the resulting polymer beads coated with TiO ₂ . It can be seen that the TiO ₂ particles are evenly coated on the polymer beads.

Example 2 Preparation of ZnO Coated Polymer Beads

Polymer beads made of vinyl dimethicone having a diameter of 3-15 μm were dispersed in tetrahydrofuran at 15 wt% while stirring using a stirrer (rpm 200) for 30 minutes.

Silicone oil was added to the dispersion by 1 weight percent of the polymer beads and dispersed while stirring for 10 minutes, and ZnO having a diameter of 20 nm was added to the polymer beads at a weight ratio of 2: 3 (67 wt% of the polymer beads) and stirred for 20 minutes. Reaction at

The reaction was filtered through a high pressure filter to obtain cake aggregates and dried in a dryer at 45 ° C. to remove residual solvent and triturate with Henschel mixer.

2 is a SEM photograph of the resulting ZnO-coated polymer beads. It can be seen that ZnO was evenly coated on the surface of the polymer beads.

Example 3 Sensory inspection such as feeling of use of the cosmetic raw material according to the present invention

The use, spreadability and adhesion of 20 nm ZnO powder and 150 nm TiO ₂ powder, which are not coated on the cosmetic raw material and the polymer bead according to the present invention prepared in Examples 1 and 2, 15 Comparative investigations of the objects are shown in Table 1 below.

Feeling refers to the feel felt when used as a cosmetic, and spreadability refers to the spread of the spread when applied to the skin using a puff. In addition, the adhesion refers to the application by puff when used as a cosmetic and the degree of adhesion to the skin after its application.

Item ZnO ZnO + Polymer Beads (Example 2) TiO ₂ TiO ₂ + Polymer Bead (Example 1) Feeling × ◎ × ◎ Spreadability △ ○ △ ○ Adhesion ○ △ ○ △

◎: Very good ○: Good, △: Normal, ×: Poor

Looking at the results of Table 1, TiO ₂ and ZnO have a strong self-cohesion due to the fine particles, and because of the nature of the accumulation in the curve of the skin, the feeling of use is inferior, when coated on the polymer beads, the polymer beads are spherical micron size It is judged to be excellent in usability and spreadability because it is a particle of, and it is judged that the decrease in adhesion is due to the reduction of the skin contact surface due to the spherical shape.

The cosmetic composition containing the cosmetic raw material of the present invention contains inorganic powders such as TiO ₂ , SiO ₂ or ZnO and thus exhibits excellent chemical stability, physical stability and light stability.

As described above, the present invention relates to a method for preparing a cosmetic raw material containing an inorganic substance by coating on the surface of the polymer bead, according to the present invention, the UV blocking effect, the whitening effect, the light stability of the inorganic powder The present invention is a very useful invention in the cosmetic industry because it can provide a cosmetic raw material and a cosmetic material using the same, while improving the low usability of the inorganic powder and at the same time have a functional property such as.

1 is an SEM image of TiO ₂ coated polymer beads of Example 1. FIG.

FIG. 2 is an SEM image of ZnO-coated polymer beads of Example 2. FIG.

Claims (4)

Iii) dispersing the polymer beads of dimethicone or vinyl dimethicone having a diameter of 3-15 μm using a disperser in a solvent at 10-30% by weight; Ii) dispersing silicone oil in the dispersion by adding 1-3 weight percent of the polymer beads; Iii) adding the cosmetic raw material inorganic powder containing TiO ₂ , SiO ₂ or ZnO with a diameter of 10-300 nm to be coated on the polymer beads as 10-100 weight percent of the polymer beads and reacting in the reactor; And Vi) filtering the reactants with a high pressure or low pressure filter, followed by drying and grinding at 40-50 ° C. The method of claim 1, wherein the solvent is tetrahydrofuran, and the inorganic powder is TiO ₂ or ZnO. A cosmetic raw material prepared by the method according to claim 1. Cosmetics prepared by containing the cosmetic raw material of claim 3 as an active ingredient.