JPS61197507A - Production of solid cosmetic - Google Patents

Abstract

PURPOSE:When a solid cosmetic is made from sintered product of inorganic pigment and a cosmetic substance soaked in the pigment, a pore-forming material which remains at the start of sintering is used as a material to give the product of good quality. CONSTITUTION:When a solid cosmetic, especially used in the form of a stick, such as eye liner or eye brow is produced from a sintered and formed inorganic pigment such as kaolin or bentonite and an extender which is included in pores, the same material as the pore-forming substance remaining in the pigment at the start of sintering is used to change porosity, pore diameter distribution to give the cosmetic of high shape retention and application feeling. The material to be sintered is preferably a kind of clay and the pore-forming material is most preferably carbon black, graphite or another carbonaceous substance.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) This invention relates to solid cosmetics. It is particularly suitable for eyeliners, eyelashes, etc., which are used as small diameter sticks.

(Conventional technology) Solid cosmetics generally consist of colorants and excipients.

Coloring agents are pigments and dyes, excipients are higher alcohols, higher fatty acids, waxes such as wood wax, and oily or semi-solid substances such as liquid paraffin, lanolin, and petrolatum are also often included0. 2. After sufficiently mixing the colorant and excipient, it is extruded or poured into a mold, but there are also cases where an excipient is applied to the surface of the pigment and the pigment is compressed to form a solid.

(Problems to be Solved by the Invention) If the excipient material used to maintain the shape is used as much as possible, the feeling of application to the skin and the color development will deteriorate. On the other hand, in order to achieve as good application feel and color development as possible on the skin, shape retention must be sacrificed. This is why currently commercially available bar-shaped cosmetics and the like are used in situations where the correlation between the above-mentioned shape retention, application feel on the skin, and color development is extremely low.

The above-mentioned problem can be greatly improved by forming the solid cosmetic material from a sintered body of an inorganic pigment and a removable substance impregnated into the pores of the sintered body.

However, the quality characteristics obtained vary greatly depending on the manufacturing method, and even if the shape retention is good, the feel on the skin and the color development may not necessarily be good.

The present invention aims to provide a manufacturing method suitable for obtaining a product having two good quality characteristics.

(Means for Solving the Problems) The present invention is a method for producing a solid cosmetic comprising a sintered compact of an inorganic pigment and a removable substance impregnated into the pores of the sintered compact, the method comprising: One aspect of the present invention is a method for producing a solid cosmetic, characterized in that a pore-forming material remaining at least at the start of sintering is used in the sintering process for producing the sintered compact.

Examples of inorganic pigments are talc, kaolin, bentonite,
Calcium carbonate and magnesium carbonate.

Magnesium silicate, silicic anhydride, titanium oxide.

With zinc oxide, iron oxide, chromium oxide, gunjo, etc., 1
It is considered to be a species or a combination of two or more species. Examples of suitable materials include clay-based kaolin and bentonite, which are not only easily available but also require sintering at a relatively low temperature. As for the range of colors, various colors can be obtained by coexisting with other inorganic pigments. In the case of a combination of two or more types, it is sufficient that at least one type of inorganic pigment forms a skeleton in the sintered compact.

Furthermore, the material used, that is, the sintered material, does not have to be the inorganic pigment itself that exists as a sintered compact. For example, if you use modified organic bentonite as a sintering material.

It changes depending on the sintering process, and there are many other sintered materials that undergo metamorphosis depending on the atmosphere during the sintering process.

The removable substances impregnated into the pores of the sintered compact include those mentioned above as excipients, as well as those used as base materials in various cosmetics such as emulsion type, ointment type, and emulsion type. A variety of materials can be used, including others listed below. If it is difficult to impregnate, heat or pressurize as appropriate, or use a solvent. Also.

Dyes, fragrances, antioxidants, preservatives, etc. can also be used in combination. Different types of solid cosmetics can be made by using the same sintered body and simply changing the skin-wearing substances.

Pore-forming materials, as the name suggests, are materials used to form pores.1 For example, by heat during the sintering process, or alternatively by chemical treatment after the sintering process, the pore-forming material is used to form pores. helps control porosity by removing at least a portion of it, as described above.

It must remain at least at the beginning of sintering during the sintering process. Therefore, substances that can be used include various inorganic substances and organic substances, but they must be selected appropriately depending on the type of sintering material, the atmosphere during the sintering process, etc. The results will also be related to the method of pore-forming material removal treatment. For example, when using metals such as zinc, copper, and aluminum, they may become oxidized, carbonated, or nitrided into compounds depending on the atmosphere during the sintering process, so select a removal process that can remove these compounds. In addition, when using water-soluble substances such as sodium chloride and potassium sulfate, when making a sintered powder compact, a water-soluble resin such as polyvinyl alcohol as a forming aid and water as a solvent are used. Instead, after sintering, it is possible to dissolve and remove with water without using acid or alkali. If a material with a high carbon yield is used, it can be used as a pore-forming material by performing the sintering process in a non-oxidizing atmosphere such as nitrogen gas, but regardless of the continuity of the sintering process and the process,
It is difficult to remove stable carbides without further treatment in an oxidizing atmosphere.

The use of clay-based materials as sintering materials is advantageous in that low-temperature sintering is possible, and the range of materials that can be used as pore-forming materials can be expanded. especially,
Carbonaceous substances 1 such as carbon black and graphite are used as pore-forming materials.

Moreover, it can be used without requiring both a non-oxidizing atmosphere and an oxidizing atmosphere during the sintering process. In other words, regardless of whether sintering is performed in an aggressive oxidizing atmosphere such as 100% oxygen, or where the temperature increase rate during sintering must be extremely slow, normal sintering must be performed in an air atmosphere. However, these carbonaceous substances can remain sufficiently at the start of sintering. Therefore, the sintering process and the removal process of the pore-forming material can be performed easily and simultaneously.

In order to obtain the product, 1. For example, a sintered material, a pore-forming material, polyvinyl alcohol used as necessary,
Molding aids such as polyvinyl chloride, polymethyl methacrylate, and ABS resin.

After mixing (mixing) plasticizers, solvents, stabilizers, sintering aids, etc. with a mixer or roll machine, it is formed into a rod or other appropriate shape, which is then sintered.

If necessary, the pore-forming material is removed as a step during the sintering process or as a separate process, and then the pore-forming material is impregnated with the sintering material, but the sintering material and the pore-forming material are first triblended. You can change the process as needed, such as keeping it in place, and bake it as it is in the mold without using any molding aids! It can also be processed to obtain products. Incidentally, although it varies depending on the material used, the porosity of the sintered compact is preferably about 50% to 90%, more preferably 65% to 85%.
It is generally good to set it to about %.

(effect) Two considerations made by the inventors are described below.

As mentioned above, the pore-forming material is for forming pores, but at the start of sintering, and therefore when the sintered skeleton begins to be formed, the pore-forming material remains and the sintered skeleton has the following properties: This will contribute to setting the degree of porosity. That is,
The porosity itself can vary depending on the type of sintering material and other materials, the proportions used, and the sintering conditions, but the degree of porosity depends not only on the porosity but also on the distribution of pore diameters. It depends.

This pore size distribution changes depending on the use of the pore forming material. If the pore size distribution changes, the content of removable substances, which determines the quality characteristics of the sintered compact, also changes. After all, the quality characteristics change depending on the use of the pore-forming material, and the following examples and evaluation results show that this change is in a favorable direction.

(Example) Hereinafter, parts simply refer to parts by weight.

<Example 1> Clay (bentonite type) 20 parts iron oxide
30 parts scaly graphite
30 parts polymethyl methacrylate
30 parts dioctyl phthalate
30 parts Methyl ethyl ketone 100 parts The above compounded materials were kneaded using a mixer and a roll machine, extruded into a thin wire shape, and cut into a length of 40 mm.

Placed in a magnetic crucible and placed in an oxidizing (air) atmosphere.

The temperature was raised to 780°C over 24 hours and held at 780°C for 1 hour. After natural cooling, the one taken out has a diameter of 1.2m.
It is a brownish-brown cylindrical sintered body of m.

This was impregnated with a removable substance prepared by uniformly adjusting the following blended materials (impregnation temperature: 100°C).

Carnauba wax 10 parts Ceresin wax 10 parts Beeswax
10 parts Vaseline
40 parts lanolin 20
Part liquid paraffin 40 parts Isopropyl myristate 6 parts <Examples 2 to 4> In Example 1, the amount of graphite used was 10 parts.

Examples 2 to 4 were made in the same manner as in Example 1 except that the parts were changed to 20 parts and 40 parts.

<Example 5> Everything was the same as in Example 1 except that carbon black was used instead of graphite.

<Example 6> In Example 1, the heat treatment up to 780°C was changed from an oxidizing atmosphere to a non-oxidizing (closed) atmosphere.

After holding at 780°C for 1 hour, again under air atmosphere,
Everything was the same as in Example 1 except that the treatment was carried out at 700°C for 3 hours.

<Example 7J> A sintered body constructed in the same manner as in Example 1 except that IJum fine powder was used (in Example 1, chloride was used instead of graphite) was thoroughly washed with water.

After drying, a removable substance was impregnated in the same manner as in Example 1.

<Comparative Example 1> Everything was the same as in Example 1 except that graphite was not used.

<Comparative Example 2> Clay (bentonite type) 20 parts iron oxide
30 parts ABS resin
42 parts dioctyl phthalate
'50 parts methyl ethyl ketone 10
0 parts Except that the above compounded materials were used, and that the temperature was not raised to 780°C for 10 hours, but was allowed to cool naturally without being held at 780°C.

Everything was the same as in Example 1.

Comparative Example 3 Carnauba wax 10 parts Paraffin wax 20 parts Candelilla wax 3 parts Beeswax
1 part isostearic acid
5 parts liquid paraffin 7 parts methylphenylpolysiloxane 4 parts 40 parts of iron oxide and 3 parts of talc were added to a uniform solution of the above compounded materials,
After kneading with a roll machine, the mixture was poured into a mold to obtain a brown cylindrical body with a diameter of 1.2 mm.

(Effects of the Invention) Table 1 shows the results of characteristic evaluation of the products obtained on each side.

Table 1 (Note 1) The porosity is for the sintered compact before being impregnated with a removable substance, and was measured by the displacement method (20°C). That is, when the volume of the sintered compact is 72 W, the weight of the sintered compact after being impregnated with water by boiling is W', and the density of the water.

Porosity = ((w'-W)/DV) x 100 (
%) (Note 2) Bending strength was measured using a rheometer (25°C) 0 (Note 3) The feeling of application to the skin and coloration are based on sensory evaluation, and are based on Comparative Example 2. A good result was marked as ○, an equivalent result was marked as Δ, and a poor result was marked as ×.

From Table 1, 2. The manufacturing method of the present invention is a manufacturing method suitable for obtaining products with good quality characteristics.

Further, from a comparison between Example 1 and Comparative Example 2, which had the same porosity value, it can be seen that this is due to the use of the pore-forming material.

Claims (1)

[Claims] A method for producing a solid cosmetic comprising a sintered compact of an inorganic pigment and a skin-applying substance impregnated into the pores of the sintered compact, the method comprising a sintering process for producing the sintered compact as one of the materials. A method for producing a solid cosmetic, characterized in that the pore-forming material remaining at least at the start of sintering is used.