JP6091059B2 - Method for producing aqueous paste - Google Patents

Description

The present invention is, for example, is used as a paste in cosmetics are those concerning the manufacturing method of the preferred aqueous paste.

  Conventionally, as a paste for cosmetics, (a) a color base obtained by dispersing an inorganic or organic pigment in a base oil used for lipstick, or (b) an oil phase such as silicone oil, hydrocarbon, ester oil or the like. A paste in which a silicone elastomer having high oil absorption or PMMA particles is dispersed is used. Among them, the latter paste (b) is mainly blended in a water-in-oil type cosmetic to improve the touch at the time of application and to give a function as a makeup base.

  However, when such a paste is blended into an oil-in-water cosmetic, the paste generally has to be added to an oil phase with a small blending ratio, not only the blending amount is limited, but also the oil-in-water characteristics. The problem that the refreshing feeling at the time of use is impaired arises.

  In order to solve such a problem, a technique has been proposed in which spherical particles themselves are hydrophilically treated and blended into an aqueous phase to increase the blending amount (see, for example, Patent Documents 1 to 3). Here, Patent Documents 1 and 2 disclose a technique related to a coating treatment of a water-soluble cationic polymer and a low-molecular organosilicon derivative, and Patent Document 3 discloses a technique for surface-treating a polyether-modified silane.

  When such a hydrophilic powder is used, it can be added to the water phase of an oil-in-water cosmetic, and the amount of blending can be increased, effectively improving the feel of the cosmetic itself. Is possible.

  However, since the powder itself is hydrophilic, there is a problem that it is difficult to obtain a coating film having sufficient water resistance as a cosmetic. In order to improve the water resistance of the coating film, it is effective to make the powder used hydrophobic, but it is extremely difficult to add the hydrophobic powder to the aqueous phase.

Furthermore, in order to solve the above problems, it is conceivable to use a paste dispersed in an aqueous gel having as high a viscosity as possible (see, for example, Patent Document 4). Patent Document 4 discloses an oil-in-water lip base in which an aqueous gel is prepared with a water-swellable thickener and then an organic silicone resin is dispersed.
If this paste is used, it can be added to the aqueous phase. However, since the viscosity of the paste itself is high, there is a problem that the amount of the powder for improving the touch is limited.

Japanese Patent No. 4250551 Japanese Patent No. 4475970 JP 2003-26958 A JP 2007-284376 A

The present invention has been made in view of the above-described problems, and is a method for producing an aqueous paste that can be blended in a lot of oil-in-water cosmetics and has high water resistance during use and excellent usability. It is intended to provide.

As a result of intensive studies to solve the above problems, the present inventors have added a hydrophobic powder, an amphiphilic dispersant, and a dispersion aid to water and dispersed using a twin screw extruder. It has been found that an aqueous paste in which hydrophobic powder is dispersed can be obtained without using an aqueous gel .

In short, in order to achieve the above object, the method for producing an aqueous paste according to the present invention comprises:
Mannosylerythritol lipid, which is a glycolipid composed of mannose, a sugar alcohol and a fatty acid represented by the following chemical formula (1) derived from a natural product as a hydrophobic powder and a dispersant, or a natural product derived from the following chemical formula (1) 2) Amphiphilic compound that is a condensate of the acylated amino acid salt and L-lysine, and polyhydric alcohol as a dispersion aid in water using a twin screw extruder, the screw speed is 150 rpm to 600 rpm It is characterized by kneading in the range of .

In the present invention, mannosyl erythritol lipid, which is a glycolipid composed of mannose, sugar alcohol and fatty acid represented by the above chemical formula (1), which is derived from a natural product as a hydrophobic powder and a dispersant, or also derived from a natural product Rotation of the screw using a twin screw extruder with an amphiphilic compound that is a condensate of the acylated amino acid salt represented by the chemical formula (2) and L-lysine, and further polyhydric alcohol as a dispersion aid in water By kneading in a range of 150 rpm to 600 rpm, an aqueous paste having a smooth feel as a paste cosmetic and capable of giving a refreshing feel peculiar to a water base to the skin is obtained. A large amount of this aqueous paste can be blended in an oil-in-water cosmetic, and a cosmetic with high water resistance during use and excellent usability can be obtained.

Next, specific embodiments of the method for producing an aqueous paste according to the present invention will be described.

  The hydrophobic powder used in the present invention includes inorganic pigments, organic pigments, and resin powder pigments, and is not particularly limited as long as it is a substance that does not dissolve in water. The body is desirable. Examples of the plate-like powder include mica, sericite, talc, plate-like cerium oxide, plate-like zinc oxide, plate-like titanium oxide, and glass flakes. As spherical powder, silicone resin powder, polylactic acid powder, nylon powder, PMMA powder, polyurethane powder, ethylene tetrafluoride powder, etc., spherical titanium oxide, spherical silica, spherical cerium oxide, spherical zinc oxide Inorganic powders such as

  Here, each of the powders described above must have a hydrophobic surface, and may be a pigment-derived hydrophobic material or may be hydrophobicized by a hydrophobic surface treatment. Examples of the hydrophobic surface treatment include silicone treatment with polydimethylsiloxane, methylhydrogenpolysiloxane, titanate treatment, fluorine treatment, metal soap treatment, and lecithin such as phospholipids derived from other natural products. These processes may be performed singly or a plurality of processes may be used to perform the mixing process and the overlapping process.

Next, the dispersant used in the present invention can be used as long as it is an amphiphilic compound, but in recent years, it is more preferable that it is a naturally-derived component from the viewpoint of safety, and (A) the following chemical formula ( And a condensate of an acylated amino acid salt represented by the following chemical formula (2) and L-lysine, or a glycolipid composed of mannose, sugar alcohol and fatty acid represented by 1) .

Next, the dispersion aid used in the present invention is preferably a polyhydric alcohol, and examples thereof include 1,3 butylene glycol, glycerin, polyglycerin, propylene glycol, polyethylene glycol, and polypropylene glycol. Of these, polyhydric alcohols derived from natural plants are particularly preferred, and examples thereof include 1,3 butylene glycol and propylene glycol.

  In the aqueous paste of the present invention, various additives usually used in cosmetics can be used to the extent that the function is not hindered. Examples thereof include antiseptics such as phenoxyethanol and sodium dehydroacetate, and ultraviolet absorbers such as 2-ethylhexyl paramethoxycinnamate and 2-hydroxy-4-methoxybenzophenone.

  Next, in this invention, a twin screw extruder is mentioned as a mixer which can carry out a dispersion | distribution process forcibly continuously. More specifically, various twin screw extruders such as the same direction rotary screw type, different direction rotary screw type, pin screw type and kneader type can be used. A rotating mesh screw type twin screw extruder is most preferred. When continuously forcibly mixing and stirring using such a twin-screw extruder, the raw material powder is supplied to the extruder from a loss-in-weight type quantitative feeder, and water, dispersant, and dispersion aid are supplied from a quantitative pump. By supplying, it can be mixed and dispersed in the extruder cylinder. At this time, the screw rotation speed is preferably 150 rpm to 600 rpm. If the rotational speed is higher than 600 rpm, there is a high possibility that the screw shaft is eccentric, and there is a concern about metal contamination due to metal friction. Conversely, if the rotational speed is too low, the mixing capacity is insufficient. Can not get a good dispersion paste.

  The aqueous paste thus obtained can be blended in the water phase of an oil-in-water cosmetic, has a good feel during use, and a refreshing feel peculiar to an aqueous system remains. Furthermore, by using hydrophobic powder, the water resistance during coating is improved and the lasting property is also improved.

Next, although the more concrete Example of the manufacturing method of the aqueous paste by this invention is described below, this invention is not limited to a following example.

Example 1
A spherical silicone resin (manufactured by Shin-Etsu Chemical Co., Ltd., KSP-100) is charged into a loss-in-weight type quantitative feeder as a hydrophobic powder, and a co-rotating twin-screw extruder TEX30α (manufactured by JSW Co., Ltd.) so as to have a blending composition of 60% by mass. To supply continuously. At the same time, the composition of mannosyl erythritol lipid (Surf Mellow manufactured by Toyobo Co., Ltd.) 0.6% by mass as a dispersing agent, 5% by mass of 1,3 butylene glycol (1,3-BG) as a dispersing aid, and 34.4% by mass of ion-exchanged water. The mixed liquid is prepared by the above method, and continuously supplied with the same composition into the cylinder of the twin-screw extruder through the metering pump. All raw materials were mixed and dispersed in a cylinder at a screw rotation speed of 600 rpm to obtain an aqueous paste from the tip of the extruder.

(Example 2)
A mixed liquid in which the dispersant of Example 1 was mixed with a composition of 2% by mass of dilauroyl glutamic acid lysine (Perisea L-30 manufactured by Asahi Kasei Chemicals Corporation), 5% by mass of 1,3 butylene glycol, and 33% by mass of ion-exchanged water was used. Except for the above, an aqueous paste was prepared in the same manner as in Example 1.

(Example 3)
An aqueous paste was prepared in the same manner as in Example 2 except that 60% by mass of the spherical polylactic acid resin was used as the hydrophobic powder of Example 2.

Example 4
An aqueous paste was produced in the same manner as in Example 2 except that the screw rotation speed of the twin-screw extruder of Example 2 was changed to 150 rpm.

(Comparative Example 1)
As a liquid component of Example 2, an aqueous paste was used in the same manner as in Example 1 except that 5% by mass of 1,3-butylene glycol and 35% by mass of ion-exchanged water were used as a dispersion aid without using a dispersant. Was made.

(Comparative Example 2)
As the liquid component of Example 2, Example 1 was used by using only 2% by mass of dilauroyl glutamic acid lysine (Perisea L-30 manufactured by Asahi Kasei Chemicals Co., Ltd.) and 38% by mass of ion-exchanged water as a dispersant without using a dispersion aid. An aqueous paste was prepared in the same manner as described above.

(Comparative Example 3)
An aqueous paste was produced in the same manner as in Example 2 except that the screw rotation speed of the twin-screw extruder of Example 2 was changed to 100 rpm.

  About the aqueous paste obtained as mentioned above, the dispersed state immediately after dispersion and the separated state after 2 weeks were confirmed. Furthermore, each aqueous paste was added to the aqueous phase of an oil-in-water liquid foundation at a concentration of 10% to evaluate cosmetic stability. The results are shown in Table 1.

As described above, the dispersion process is forcedly and continuously performed using a twin screw extruder with a hydrophobic powder, an amphiphilic compound as a dispersant, a polyhydric alcohol as a dispersion aid, and water. An aqueous paste can be obtained. In particular, as shown in Examples 1 and 2, a hydrophobic spherical silicone resin was used as the hydrophobic powder, mannosyl erystole lipid or dilauroyl glutamate lysine was used as a dispersant, and 1,3-butylene glycol was used as a dispersion aid. The system used was a good paste after 2 weeks and showed excellent dispersion stability. In addition, when there was a deficiency in these compositions as in Comparative Examples 1 and 2, the dispersibility deteriorated and a good aqueous paste could not be obtained. Further, when the screw rotation speed of the twin screw extruder was too slow, good dispersibility was exhibited at the initial stage of dispersion as in Comparative Example 3, but the stability over time was inferior.

As described above, the aqueous paste produced by the method for producing an aqueous paste of the present invention exhibits good stability, and can exhibit good characteristics even when blended in cosmetics. In particular, it is considered to be a very effective means for blending hydrophobic powder into the water phase of oil-in-water cosmetics.

The aqueous paste produced by the method for producing an aqueous paste of the present invention can be blended in a lot of oil-in-water cosmetics, and has the characteristics that it has high water resistance during use and excellent usability. Therefore, it can be suitably used as a paste to be blended in cosmetics such as foundations.

Claims (1)

Mannosylerythritol lipid, which is a glycolipid composed of mannose, a sugar alcohol and a fatty acid represented by the following chemical formula (1) derived from a natural product as a hydrophobic powder and a dispersant, or a natural product derived from the following chemical formula (1) 2) Amphiphilic compound that is a condensate of the acylated amino acid salt and L-lysine, and polyhydric alcohol as a dispersion aid in water using a twin screw extruder, the screw speed is 150 rpm to 600 rpm A method for producing an aqueous paste, characterized by kneading in the range described above.