JP2005204784A - Bristle for makeup brush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bristle for a makeup brush excellent in a cosmetic applying effect, touch to the skin and a using feeling. <P>SOLUTION: The bristles for the makeup brush is composed of a monofilament made of a synthetic resin, a tapered part is formed at at least one end, and the tip diameter of the tapered part is ≥0.03 mm and ≤0.10 mm. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a bristle for a makeup brush that has an excellent cosmetic application effect and also has excellent touch to the skin.

  Conventionally, animal hair, synthetic resin bristle, and the like have been frequently used as cosmetic brush hair materials.

  Among them, animal hair has good retention of cosmetic liquid, soft hair and softness, but it has become difficult to obtain due to the trend of animal welfare in recent years. Had a problem that it could not be used due to animal allergies.

  On the other hand, synthetic resin bristle, unlike animal hair, can be mass-produced industrially and does not cause animal allergies, but the tip of a linear monofilament with a circular cross section has a sharp tapered shape. The bristle is not only entangled with sharp tips, but when used as a makeup brush, the tip of the bristle crushes and spreads, making it difficult to draw thin lines, and the skin feel is harder and less supple than animal hair. There was a problem.

As a technique for improving these problems, a brush tip (for example, see Patent Document 1) in which a round cross-section thread having a taper formed at the tip of a bristle and an irregular cross-section thread has been proposed. Although the retention of the cosmetic liquid is improved, the improvement of the release property is still not sufficient, and if the irregularities of the irregularly shaped cross-section yarns are made too large, the cosmetic liquid will not be held or removed easily by the brush, but also the touch However, there was a problem in that it lacked a soft touch and did not reach animal hair in terms of hair separation.
Japanese Utility Model Publication No. 4-124683 (first page)

  The present invention has been achieved as a result of studying the problem of the above-mentioned conventional synthetic resin bristle as a problem. The object of the present invention is to provide a hair and waist at the tip and uniformly apply cosmetics. An object of the present invention is to provide a bristles for a cosmetic brush that can be applied with an excellent skin feel and that is superior to animal hair.

  As a result of intensive studies to achieve the above-mentioned problems, the present inventors have found that the above object can be effectively achieved by making the tip of the tapered portion of the synthetic resin bristle non-sharp, and reached the present invention. did.

  That is, in order to achieve the above object, according to the present invention, a bristle made of a synthetic resin monofilament and having a tapered portion at least at one end, the tip diameter of the tapered portion is 0.03 mm or more and 0.0. A bristle for a makeup brush characterized by being 10 mm or less is provided.

In the bristle for makeup brushes of the present invention,
The tip diameter of the tapered portion is 0.04 mm or more and 0.08 mm or less,
It is preferable that the maximum diameter of the bristle base other than the tapered portion is 0.05 mm or more and 0.20 mm or less, and that the main component of the synthetic resin monofilament is a polyester resin. When conditions are applied, more suitable performance can be expressed.

  According to the present invention, as described below, a bristle for a makeup brush that has a fur waist at the tip, can uniformly apply cosmetics, and has excellent touch to the skin comparable to animal hair. Can be obtained.

  The present invention is described in detail below.

  A synthetic resin monofilament manufactured by a known melt spinning method is used for the bristles for the cosmetic brush of the present invention. The material is not particularly limited, but when the tapered portion is formed by a known alkali dissolution method, a polyester resin, specifically, polybutylene terephthalate (hereinafter abbreviated as PBT), polyethylene terephthalate, polypropylene terephthalate, Alternatively, copolymers and blends based on these are suitable. That is, according to the alkali dissolution method, a smooth taper shape can be obtained, and a bristle with a good touch can be obtained.

  As for the cross-sectional shape of the synthetic resin monofilament, it is necessary to select an appropriate shape from circular, elliptical, multi-leafed, polygonal or core-sheath composite cross-section depending on the properties of the cosmetic liquid used. is there. The synthetic resin monofilament may be added with a heat-resistant agent, a weather-resistant agent, a light-resistant agent, an antioxidant, an antistatic agent, an antibacterial agent, a colorant, a plasticizer, and the like as long as the object of the present invention is not impaired. An agent can be optionally contained.

  In addition, the bristles for cosmetic brushes of the present invention require that the tip end of the taper be non-sharp, but a known method can be applied to the formation of the non-sharp taper portion on the bristle made of the monofilament. For example, when chemical treatment is used, monofilaments are bundled in a straight line, the surroundings are protected with a tape or the like, and this is cut to a required length, and then one end of the bristle bundle is immersed in an alkaline solution. By appropriately adjusting the immersion temperature, the immersion time, and the like, a tapered portion with a non-sharp tip can be formed. Further, a taper portion having a non-sharp tip can also be formed by creating a bristle having a completely sharp tip by the above method and mechanically cutting only the tip portion of the bristle.

  It is important that the diameter of the taper tip of the bristles for cosmetic brushes of the present invention is in the range of 0.03 mm to 0.10 mm, preferably 0.04 mm to 0.08 mm. When the taper tip diameter is 0.03 mm or less, an undesired tendency that the tip is too soft and the tip is crushed and a thin line is difficult to draw is used. Further, when the taper tip diameter is 0.10 mm or more, excessive flexibility remains at the tip, which is not preferable because the touch to the skin is deteriorated.

  Moreover, it is preferable that the maximum base part diameter which occupies parts other than a taper part of the bristle for makeup brushes of this invention is the range of 0.04 mm or more and 0.20 mm or less, especially 0.07 mm or more and 0.15 mm or less.

  When the maximum diameter of the bristle base is not more than the above range, not only is it difficult to form a taper at the tip portion, but there is a tendency for the hair to be broken and not to be broken. The tactile sensation may become worse.

  The bristle for a cosmetic brush according to the present invention is cut into an appropriate length and planted on a brush base, such as an eyeliner brush, a mascara brush, a foundation brush, a powder brush, an eyebrow brush, a nail brush and a rouge brush. It is used as a makeup brush, but in that case, it is not only equipped with a hair waist at the tip of the brush, it can evenly apply cosmetics, but the touch to the skin is also superior to animal hair so far Exhibits effects that are not present.

  Hereinafter, the present invention will be described based on examples. The performance evaluation in the makeup brush in which the bristle for makeup brushes in the Examples was planted was performed by the following method. In addition, about the makeup | decoration brush, evaluation was implemented with the eyeliner brush produced by flocking the bristle for makeup brushes in an Example to a metal fitting, and joining a metal fitting to a axis | shaft.

[Cosmetic application performance]
Liquid cosmetic (Shiseido: ff Planetarium Eyes Pearl Blue) was applied to paper with an eyeliner brush prepared by the following method, and the length of the liquid that could be applied continuously and uniformly was measured. In addition, 15 adult women were asked to apply the liquid cosmetic with an eyeliner brush prepared by the following method, and an answer was obtained regarding their application performance. The judgment criteria were the following three stages.
Judgment: A: A thin line can be applied continuously B: Can not be applied continuously, but there is no problem in practical use C: The tip spreads and there is a problem in application performance.

[Skin feel]
At the same time as the above experiment, an answer was also obtained regarding the touch to the skin. The judgment criteria were the following five stages.
Judgment: 1 · · Tactile feeling that is soft and comparable to animal hair 2 · · Inferior to animal hair but good tactile feeling 3 · · Not particularly good tactile, but no practical problem 4 · · Insufficient irritation to skin or lack of flexibility Feels somewhat bad tactile. 5. ・ Skin irritation and lack of flexibility are prominent.

[Example 1]
Using PBT ("Toraycon" 1200S manufactured by Toray Industries, Inc.), this raw material was first pre-dried at 90 ° C for 5 hours and then dried at 130 ° C for 12 hours in a vacuum dryer. The dried raw material was put into an extruder, and the resin heated and melted at 250 ° C. was extruded from a nozzle having a round cross-sectional shape corresponding to the cross-sectional shape of the yarn, immediately cooled in 40 ° C. warm water, and this undrawn yarn was 60 ° C. Were passed through a hot water bath at 130 ° C. and dried at a total temperature of 4.60 times. Next, this drawn yarn was heat-set at a temperature of 160 ° C. under a dry heat of 0.85 times to obtain a circular cross-sectional monofilament having a maximum diameter of 0.10 mm.

  Next, the monofilament obtained above is bundled and then wound with a paper tape to form a bundle having a diameter of 45 mm. After cutting the bundle into a length of about 42 mm, one end of the bristle bundle is placed in an aqueous sodium hydroxide solution. A bristle having a non-sharp tapered portion having a tip diameter of 0.05 mm formed on one end having a length of 37 mm was immersed. Further, an eyeliner brush was produced by implanting this bristle into a metal fitting and joining it to a shaft.

[Example 2]
An eyeliner brush was produced in the same manner as in Example 1 except that the tip diameter was a non-sharp tapered portion having a tip diameter of 0.07 mm.

[Comparative Example 1]
An eyeliner brush was produced in the same manner as in Example 1 except that the tip diameter was a sharp tapered portion having a diameter of 0.01 mm.

[Comparative Example 2]
In Example 1, an eyeliner brush was produced in the same manner as in Example 1 except that the maximum diameter of the bristle base was 0.15 mm and the end portion was not tapered.

[Comparative Example 3]
An eyeliner brush was produced in the same manner as in Example 1, except that the monofilament diameter was 0.15 mm and the tip was a non-sharp tapered portion with a tip diameter of 0.12 mm.

  The result evaluated about each said eyeliner brush is shown below.

  As is clear from the results in Table 1, the brushes of Examples 1 and 2 hold the cosmetic liquid without excess and deficiency, and can be applied uniformly when applied, and show application performance over animal hair. It was. In addition, the hair and hips were flexible and the touch to the skin was evaluated to be comparable to animal hair.

  On the other hand, the brush of Comparative Example 1 has good touch to the skin, but the tip of the brush was crushed and non-uniform when applying the cosmetic liquid, and was inferior to the brush of Example 1. Further, the brushes of Comparative Examples 2 and 3 in which the bristle end portion is not tapered are inferior in retention and release properties of the cosmetic liquid and inferior in touch to the skin, and the tip diameter The thicker ones were bristle and inferior to the brush of Example 1.

  As described above, according to the bristle for cosmetic brushes of the present invention, the effect of applying the cosmetic liquid is excellent, and the effect of excellent touch feeling to the skin and good usability can be obtained. It is useful as makeup brushes such as foundation brushes, powder brushes, eyebrow brushes, nail brushes, rouge brushes and the like, and contributes particularly to women who prefer cosmetics.

Claims (4)

A bristle for a cosmetic brush, comprising a monofilament made of synthetic resin and having a tapered portion formed at least at one end, wherein a tip diameter of the tapered portion is 0.03 mm or more and 0.10 mm or less. The bristle for a cosmetic brush according to claim 1, wherein a tip diameter of the tapered portion is 0.04 mm or more and 0.08 mm or less. The bristle for a cosmetic brush according to claim 1 or 2, wherein the maximum diameter of the bristle base part other than the taper part is 0.05 mm or more and 0.20 mm or less. The bristle for a cosmetic brush according to any one of claims 1 to 3, wherein a main component of the synthetic resin monofilament is a polyester resin.