JPH056521B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a method for producing a rod-shaped cosmetic, such as an eyeliner or an eyebrow, which is held in a holder and used. (Prior Art) Bar-shaped cosmetics generally consist of a coloring agent and an excipient. Coloring agents are pigments and dyes, excipients are higher alcohols, higher fatty acids, waxes, etc., and oily and semi-solid substances such as liquid paraffin, lanolin, petrolatum, and surfactants are also often included. Usually, a colorant and excipient are sufficiently kneaded and then extruded to form a bar-shaped cosmetic. (Problems to be Solved by the Invention) Solid cosmetics must be worn out during use, and therefore must have self-wearing properties, but the portion held by the holder is extremely prone to collapse. This is an easy point. In other words, a holder such as a sharp pencil type dispensing container provides a holding force for holding the bar-shaped cosmetic, but even if a large holding force is not provided to ensure sufficient retention, the bar-shaped cosmetic does not hold the cosmetic. It collapses and is difficult to hold as desired. The smaller the rod-shaped cosmetic, the more this problem of crumbling becomes more obvious. (Means for Solving the Problems) First, a rod-shaped cosmetic is made of a self-abrasive porous sintered body of an inorganic pigment, and a skin-adhesive substance impregnated into the pores of the sintered body. Then, a reinforcing material is applied to the portion held by the holder so as to fill the surface irregularities communicating with the pores of the sintered compact, and solidified. That is, the present invention is a method for producing a rod-shaped cosmetic that is used while being held in a holder, and includes a self-abrasive porous sintered body of an inorganic pigment having a rod-like shape, and a method for producing a rod-shaped cosmetic material that is used by being held in a holder. In the method for producing a solid cosmetic comprising an impregnated skin-adhesive substance, a reinforcing material is applied to the portion held by the holder so as to fill in surface irregularities communicating with the pores of the sintered compact. The gist of the present invention is a method for producing a rod-shaped cosmetic material, which is characterized in that it hardens and hardens. Examples of inorganic pigments include talc, kaolin, bentonite, calcium carbonate, magnesium carbonate, magnesium silicate, silicic anhydride, titanium oxide, zinc oxide, iron oxide, chromium oxide, chromium hydroxide, calamine, and gunjiyo. Or a combination of two or more types. Examples of suitable materials include clay-based kaolin and bentonite, which are not only readily 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. When a plurality of materials are used in combination as in this case, it is sufficient that at least one material forms a skeleton in the sintered compact. To obtain a sintered shaped body, for example, an inorganic pigment and
Molding aids such as polyvinyl alcohol, polyvinyl chloride, polymethyl methacrylate, ABS resin,
After kneading (mixing) materials used as necessary, such as plasticizers, solvents, stabilizers, and sintering aids, using a mixer or roll machine, the product is formed into a rod shape, which is then sintered. One method is to sinter the material while it is in the mold without using any molding aids. Furthermore, it is not necessary to use the inorganic pigment itself as the material.
For example, if a modified material such as organic bentonite is used, the material changes depending on the sintering process. The important point is that the sintered shaped body finally has coloring properties, and therefore, it may be one that has gone through a color change process. The pores of the sintered compact (preferably 50 to 90
%, more preferably 70-85% porosity)
The skin-adhesive substances that are impregnated into the skin include those listed above as excipients, as well as other substances that are used as base materials in various cosmetics such as emulsion-type, ointment-type, and emulsion-type cosmetics. Various types can be used, including: If it is difficult to impregnate, heat or pressure may be applied as appropriate, or a solvent may be used in combination.
Further, fragrances, antioxidants, preservatives, etc. can also be used in combination. The reinforcing material applied to the part held by the holder is
For example, acrylonitrile-styrene copolymer resin, acrylonitrile-butadiene-styrene copolymer resin, polystyrene resin, polyvinyl chloride resin, polyvinyl alcohol, polymethyl methacrylate, etc. liquefied with a solvent, polyethylene, polypropylene, etc. are heated and melted. There are two-component reaction curing types such as epoxy resins, instant reaction types such as cyanoacrylates, and ultraviolet curing types. All of them are in liquid form, and after being applied, they are solidified by solvent removal, cooling, reaction, ultraviolet irradiation, etc. The reinforcing material can be applied to the sintered compact after it has been impregnated with the skin-adhesive substance, or it can be applied to the sintered compact before it has been impregnated with the skin-adhesive substance. In any case, it seems that the most efficient method is to align the ends of a large number of cosmetics made to a predetermined size and dip them into the reinforcing material by a certain length. That is, when obtaining a long rod-shaped body by extrusion molding, it is possible to apply the agent at determined intervals before making it into a predetermined size as a cosmetic, but it is troublesome to apply it uniformly in the circumferential direction, and It is difficult to suppress variations in the coated area after it has been adjusted to a predetermined size. In addition, the part held by the holder is in the middle of the rod-shaped cosmetic.
Not likely. A resin-like material liquefied with a solvent is an example of a preferable reinforcing material. Not only is it easy to solidify, but it is particularly useful for sintered bodies that have not yet been impregnated with an adhesive substance, or for sintered bodies that have been impregnated with an adhesive substance while leaving a portion to be impregnated with reinforcing material. This is because if the reinforcing material is applied to the sintered compact, it will penetrate into the pores of the sintered compact, making it possible to easily obtain a reinforced product to the inside. However, it is not at all desirable that the reinforcing material after solidification be compatible with the skin-adhesive substance, so care must be taken. (Function) The surface of the sintered compact is rich in irregularities. By utilizing these irregularities, and in some cases by penetrating into the interior of the sintered compact, the solidified reinforcing material becomes integrated with the sintered compact, preventing it from collapsing when a holding force is applied from the holder. prevent. (Example) Hereinafter, parts simply refer to parts by weight. Example 1 Clay (bentonite type) 22 parts Red iron 30 parts Graphite (pore forming material) 40 parts Polymethyl methacrylate 50 parts Dioctyl phthalate 25 parts Methyl ethyl ketone 100 parts The above compounded materials were kneaded using a mixer and a roll machine, and then extruded into a fine wire shape. After cutting to a length of 40 mm, they were placed in a magnetic crucible and heated in an oxidizing (air) atmosphere for 24 hours.
The temperature was raised to 800°C over time and held at 800°C for 1 hour. After natural cooling, the one taken out has a diameter of 1.5
mm brown rod-shaped body with a porosity of 77%. This rod-shaped body was vertically immersed in a container containing a 10% aqueous solution of polyvinyl alcohol to a depth of 2 mm until it reached the bottom of the container, and after 5 minutes, it was taken out and thoroughly air-dried. As a result, the rod-shaped body is approximately 3mm from the end.
A polyvinyl alcohol-impregnated area was formed over the area, and this was impregnated with a skin-wearing 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 parts Liquid paraffin 40 parts Isoprovil myristate 6 parts Example 2 In Example 1, 5 parts of polyvinyl alcohol
The same procedure as in Example 1 was carried out except that a 15% solution of acrylonitrile-styrene copolymer resin in methyl ethyl ketone was used instead of a 15% aqueous solution. Comparative Example Carnauba wax 5 parts Ceresin wax 5 parts Microcrystalline wax 20 parts Vaseline 7 parts Lanolin 5 parts Liquid paraffin 7 parts Isoprobil myristate 5 parts Red red 25 parts
1 part and 3 parts of talc were added, kneaded using a roll machine, and poured into a mold to obtain a brown rod-shaped body with a diameter of 1.5 mm. (Effect of the invention) The end portion of the material obtained in each example (in Examples 1 and 2, the side treated with polyvinyl alcohol aqueous solution, etc.) was sandwiched between parallel plates, and the pressurizing force when pressure collapse occurred was measured. The results of the measurements (using a rheometer) are shown in Table 1.

[Table] Here, since the pressure values showed variations among multiple pieces, the average value is shown as an approximate value, but the values of Examples 1 and 2 are less likely to collapse than those of Comparative Examples. It is well understood that this is becoming more common. As described above, according to the present invention, it is possible to obtain a bar-shaped cosmetic that does not easily collapse when held with a holder. Furthermore, since no great pressure is applied when processing the reinforcing material, there is no need to worry about the reinforcing material collapsing during processing.

Claims (1)

[Claims] 1. A method for producing a rod-shaped cosmetic that is used while being held in a holder, which comprises: a rod-shaped self-abrasive porous sintered body of an inorganic pigment; and a skin impregnated into the pores of the sintered body. In the method for producing a solid cosmetic comprising a sexual substance, a reinforcing material is applied to the portion held by the holder so as to fill the surface irregularities communicating with the pores of the sintered compact, and solidified. A method for producing a bar-shaped cosmetic characterized by: