JPS6323810A - Cosmetic - Google Patents

Abstract

PURPOSE:A cosmetic, containing fine flat mica powder obtained by bonding ultrafine mica powder with a transparent binder into microspheres and capable of sufficiently improving the extensibility while fully utilizing optical characteristics unique to the mica. CONSTITUTION:A cosmetic containing fine flat mica powder consisting of at least one of mica, mica coated with titanium oxide and mica coated with iron oxide, consisting of ultrafine mica powder, containing >=70% particles passing through a 1mum screen opening and having 0.2-0.02mum thickness at the same time and mostly bonded into microspheres having 2-30mum diameter with a transparent binder, e.g. silicic acid, titanium oxide, alumina, various resins or paste. Makeup can be thinly and naturally finished by using the above- mentioned cosmetic utilizing optical characteristics unique to mica with excellent extensibility without unevenness.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is directed to the use of at least one of mica, titanium oxide coated mica, and iron oxide coated mica to provide unique optical properties, such as gloss and color. The present invention relates to a cosmetic containing flat mica fine powder.

[Prior Art] Conventionally, the oblate mica fine powder was quite large, for example, the length was 3 μm or more and the thickness was 0.2 μm or more, and the mica fine powder was individually dispersed to make it larger in cosmetics. .

[Problem that the invention seeks to solve]

However, due to the inclusion of flat mica fine powder, the spread of the cosmetic composition is poor and the finish of the cosmetic composition is likely to be unsatisfactory.

An object of the present invention is to improve the spreadability of cosmetics by adding innovations to fine mica powder.

[Means for solving problems]

The characteristic structure of the present invention is that the flat mica fine powder made of at least one of mica, titanium oxide coated mica, and iron oxide coated mica has a thickness of 0.2 to 0.7 μm, with 70% or more passing through a 1 μm joint. It consists of ultrafine powder with a diameter of 0.02 μm, and the majority of the mother ultrafine powder is bound by a transparent binder into small spheres with a diameter of 2 to 30 μm, and its effects are as follows.

[For production]

In other words, when we changed the properties of mica fine powder in various ways and investigated its effects on the spread of cosmetics, optical properties, and skin, we found that, as mentioned above, we made mica fine powder into an ultra-fine powder that was much smaller than before. It was confirmed that when bound to the small spheres with a transparent binder, there is no adverse effect on the skin, and while the unique optical properties of mica are fully utilized, the spreadability of the cosmetic material can be sufficiently improved.

〔Effect of the invention〕

As a result, it has become possible to provide an extremely excellent cosmetic material that takes advantage of the unique optical properties of beautiful mica, spreads well, and gives an even, beautiful, thin, and natural finish.

〔Example〕

Next, examples will be shown.

The mica fine powder is an oblate ultrafine mica powder made of at least one of mica, titanium oxide coated mica, and iron oxide coated mica, and 70% or more of the oblate ultrafine mica powder passes through a 1 μm node. At the same time, the thickness is 0.2 to 0.02 μm. And, Figures 1 and 2
As shown in the figure, a large number of ultrafine mica powders (1) are bound by a transparent binder (2) into small spheres with a diameter of 2 to 30 μm, which will hereinafter be referred to as spherical mica.

The binder (2) is silicic acid, calcium silicate, titanium oxide, zinc oxide, alumina, or their hydroxides,
In addition, it is made of one or more of various resins and adhesives, and covers the entire ultrafine mica powder (1).

Examples of the components of spherical mica are shown in the table below.

The above-mentioned spherical mica is mixed into a material suitable for the type of cosmetic to produce a cosmetic with optical properties unique to mica. Specific examples of the cosmetic are shown below.

(a) Powder foundation spherical mica (average particle size 6 μm) 45 (%) Super micron mica (ultrafine mica) 33 Colored pigment paste 8 Isostearyl alcohol 10 Cyclodextrin 3.5 Fragrance
0.5 During production, spherical mica and super micron mica are mixed using a mixing machine, such as the Hosokawa Nauta Mixer (trademark).
Mix for 10 minutes. The colored pigment paste and isostearyl alcohol are mixed in an emulsifying machine, e.g. Dispermill (trademark).
Once the temperature is raised to 60°C, the mixture is sprayed from above into the Hosokawa Nauta mixer using the Micro Injection (trademark) nozzle attached to the mixer, and the mixture is mixed with mica for about 15 minutes until it becomes crumbly. Mix. At this time, the material may be crushed and dispersed using a crushing device installed at the bottom of the Hosokawa Nauta mixer, such as a lamp breaker (trademark). After adding about 5% water, cyclodextrin and fragrance are mixed and stirred in a dry mixer for about 1 hour until dry, and after drying, they are put into a Hosokawa Nauta mixer and mixed uniformly. The mixture of all components is re-dispersed and adjusted in particle size using a pulverizer connected to the outlet of the Hosokawa Nauta mixer, such as Hosokawa Micron Fisotsu Mill (trademark), and the product is filled into a container.

(b) Emulsified foundation spherical mica (average particle size 2 μm) 8 (%) Super micron mica 5 Colored pigment paste 20 Stearic acid 3 Isostearyl alcohol 10 Activator 5 Liquid paraffin 13 Propylene glycol 5 Water 35.5
Fragrance 0.5 In addition, during production, all ingredients other than the fragrance are suspended and emulsified in an emulsifier, such as Disper Mill (trademark), while circulating, and when the temperature is raised to 80°C, the Disper Mill is stopped.
The hopper of the disper mill is cooled to below 35°C, then the fragrance is put into the hopper, the disper mill is operated again, and when the temperature rises to 50 °C, the disper mill is stopped, and the mixture is filled into a container to form a product.

(c) Oil-based foundation spherical mica (average particle size 10.5 μm) 37 (%) Super micron mica 12 Color pigment paste 22.7 night paraffin 7 paraffin
4 Isostearyl alcohol 9 Lanolin 6 Activator 2 Fragrance 0.3 During production, spherical mica and super micron mica are mixed in a mixer, such as the Hosokawa Nauta mixer (trademark).
Mix for 7 minutes. All other ingredients except the fragrance are stirred and emulsified in an emulsifier, such as Disper Mill (trademark), until the temperature rises to 80°C, and then sprayed into the Hosokawa Nauta mixer. Heat the container jacket to 90°C, further combine for about 5 minutes, cool to 50°C, then mix in the fragrance and mix for about 5 minutes, cool the container jacket to 20°C, and fill the mixture into the container. Product.

Next, in order to compare the cosmetics listed in items (a) to c) above with conventional commercially available products, sensory evaluations were conducted on 50 women over a period of 6 months, and the results are shown in the table below. Note that A indicates the product of the present invention and B indicates the conventional product. A>B indicates that A is superior to B, and A=B indicates that the two are not much different.

[Brief explanation of the drawing]

FIGS. 1 and 2 are conceptual diagrams showing different examples of the bonding state of ultrafine mica powder used in the present invention. (1)...Ultrafine mica powder, (2)...No<Ingu.

Claims (1)

[Claims] A cosmetic material containing flat mica fine powder made of at least one of mica, titanium oxide coated mica, and iron oxide coated mica, wherein 70% or more of the flat mica fine powder passes through a 1 μm joint and has a thickness. is 0.2~0.
It consists of ultrafine powder (1) of 0.02μm, and its ultrafine mica powder (1
) with a diameter of 2 due to the transparent binder (2).
Cosmetics bound to ~30 μm spherules.