JP5288098B2 - Brush hair material, method for producing the same, and brush - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a synthetic resin bristle material and a brush using the bristle material, and more specifically, higher application performance than conventional synthetic resin bristle materials, particularly when used in a cosmetic brush. The present invention relates to a bristle material for a brush and a brush that have excellent skin feel.

  Hair brushes, paint brushes, and makeup brushes such as eyeliners and face brushes have conventionally used animal hair. However, in recent years it has become difficult to procure animal hair. Synthetic resin hair materials such as N610) and polybutylene terephthalate (hereinafter referred to as PBT) are being used.

  In particular, a synthetic resin hair material with a tapered taper tip makes it easier to bundle the tip for brushes and paintbrushes and improves application performance, and for cosmetic brushes it provides improved application performance and good tactile sensation. Since it is obtained, it is becoming mainstream to be used for these applications.

  However, in the above synthetic resin hair material, especially a cosmetic brush, since the amount of cosmetics contained is less than animal hair, it cannot be used continuously and frequent replenishment is required.

As a technique for improving such a problem and giving the synthetic resin hair material characteristics similar to animal hair, a hair material having an uneven cross section (for example, see Patent Document 1) has already been proposed. . However, this hair material cannot be said to have performance comparable to animal hair because the feeling of use is impaired by the surface irregularities.
Japanese Patent No. 1545642 (first page)

  The present invention has been achieved as a result of studying the solution of the problems in the above-described prior art as an object.

  That is, an object of the present invention is to provide a bristle material for a brush having performance comparable to animal hair while maintaining a feeling of use and also having high application performance, and a brush using the same, particularly a cosmetic brush. .

  In order to achieve the above object, according to the present invention, a bristle material for a brush having a tapered portion formed at least at one end of a bristle made of a synthetic resin monofilament, wherein the tapered portion has a circular cross-sectional shape perpendicular to the fiber axis direction. A bristle material for a brush is provided in which the cross-sectional shape of the main body portion other than the cross-section and the tapered portion is an irregular cross-section.

  In addition, the method for manufacturing the bristle material for brushes of the present invention having the above-described structure is a circular cross section using a synthetic resin whose core part has a slow chemical solution dissolution rate, and the sheath part has a chemical solution dissolution rate higher than the synthetic resin of the core part. A core-sheath composite monofilament melt melt-spun using a fast synthetic resin is used as a cut bristle, and a tapered portion is formed at least at one end of the cut bristle bundle by chemical treatment.

  Furthermore, the brush of the present invention is characterized in that the above-described brush bristle material is used as at least a part of the bristle material, and particularly when the cosmetic brush is used, the effect is preferably exhibited.

  ADVANTAGE OF THE INVENTION According to this invention, the hair material for brushes which has the performance equivalent to animal hair which has high application | coating performance while maintaining a feeling of use, and a brush using the same can be obtained, and these are used especially for cosmetics. In such a case, it is possible to obtain a brush hair material and a brush that have high application performance compared to conventional synthetic resin hair materials and are excellent in touch to the skin.

  Hereinafter, the bristle material for brushes of the present invention will be specifically described with reference to the drawings.

  1 is a side view showing an example of the bristle material for a brush of the present invention, FIG. 2 (a) is a cross-sectional view taken along the line AA in FIG. 1, FIG. 2 (b) is a cross-sectional view taken along the line BB, and FIG. ) To (e) are cross-sectional views showing examples of other core-sheath composite monofilaments that can be used in the present invention.

  As shown in FIG. 1, the brush bristle material 1 of the present invention comprises a synthetic resin monofilament bristle 1, and a tapered portion 3 is formed on at least one end of the bristle main body 2 (hereinafter referred to as the main body portion 2). ing.

  And as shown in FIG. 2, the cross-sectional shape perpendicular | vertical to the fiber-axis direction of the taper part 3 is comprised by the circular cross section, and the cross-sectional shape of the main-body part 2 is comprised by the odd-shaped cross section (in the drawing multi-leaf cross section).

  In order to obtain such a configuration, the synthetic resin monofilament constituting the bristle 1 has a core-sheath composite structure including the core portion 4 and the sheath portion 5, and the cross-sectional shape perpendicular to the fiber axis direction of the core portion 4 is circular. It is important that the cross-section and the cross-sectional shape of the sheath portion 5 be an irregular cross-section (multi-leaf cross-section in the drawing).

  Therefore, since the taper part 3 is comprised substantially from the core part 4, the cross-sectional shape is a circular cross section similar to the said core part, and the cross-sectional shape of the main-body part 2 is a deformed cross section.

  That is, since the taper portion 3 has a circular cross section, for example, when this is used in a makeup brush, the touch to the skin is excellent and the tip is easy to gather, and at the same time, the main body portion 2 other than the taper portion has an irregular cross section. Therefore, the adhesion amount of the cosmetic increases and the application durability is excellent.

  In the bristle material for brushes of the present invention, it is important to select the material of the core and the sheath, the core is a synthetic resin having a slow dissolution rate with respect to the chemical used in the chemical chemical treatment described later, and the sheath is A synthetic resin having a higher chemical solution dissolution rate than the synthetic resin in the core is used.

  As a specific combination, when the chemical used for the chemical chemical treatment is an alkaline chemical such as a sodium hydroxide solution, the combination of core / sheath is polybutylene terephthalate (hereinafter referred to as PBT) / polyethylene terephthalate. (Hereinafter referred to as PET), PBT / polyester elastomer, PBT / polypropylene terephthalate (hereinafter referred to as PTT), PBT / polyethylene naphthalate, PET / polyester elastomer, etc. Also, chemicals used in chemical chemical treatment are acidic such as hydrochloric acid In the case of a chemical solution, examples thereof include polyamide 6 · 10 / polyamide elastomer, polyamide 6 / polyamide elastomer, and the like, but are not limited thereto, and can be appropriately selected.

  In addition to the particles such as various inorganic particles, various metal particles, and cross-linked polymer particles, the above-mentioned synthetic resin may be a known antioxidant as long as it does not inhibit the effects of the present invention. Agents, light-proofing agents, anti-glare agents, ion-exchange agents, anti-coloring agents, anti-static agents, various coloring agents, waxes, silicone oils, various surfactants, various reinforcing fibers, and the like can be optionally added as appropriate.

  The brush bristle material of the present invention does not need to be manufactured using any special method. The above-described core-sheath composite monofilament can be produced by a known composite melt spinning method, and is obtained by melting and discharging two selected raw materials from a composite extruder, and after cooling, stretching and heat setting. . The tapered portion can be formed by concentrating the monofilament and cutting it into a predetermined length to form a bundle of cut bristle, and applying a known chemical solution treatment to at least one end thereof.

  In this chemical chemical treatment, at the end of the cut bristle immersed in the chemical, the sheath portion 5 having a high dissolution rate is first dissolved to leave only the core portion 4 having a circular cross section, and then the core portion 4 having a low dissolution rate. Since it gradually dissolves, it becomes tapered while maintaining a circular cross section.

  FIG. 1 and FIG. 2 show an example of a bristle material for a brush obtained by the above method. In this case, the main body portion in which the cross-sectional shape of the taper portion 3 including the core portion 4 is circular and the initial shape of the sheath portion 5 is maintained. The cross-sectional shape of 2 is an eight-leaf shape.

  FIGS. 3C to 3E show examples of other core-sheath composite monofilaments that can be used in the present invention. FIG. 3C shows a cross-sectional shape of the main body 4, and FIG. Triangles and (e) also show bell shapes, but examples include triangles and quadrilaterals, but are not limited to these as long as they have an irregular cross-sectional shape that can improve cleaning properties.

  Furthermore, in the bristle material of the present invention, it is possible to arbitrarily add a wave shape in the fiber axis direction, thereby further increasing the amount of the cosmetic material attached to the makeup brush and increasing the swelling of the hair bundle. It is also possible to obtain a softer tactile feel.

  The brush bristle material thus obtained has a circular cross section with a tapered portion that mainly functions as a brush, so that the cosmetic brush is excellent in tactile sensation and cohesion of the tip, and further, the non-tapered portion has an irregular cross section. The adhesion amount of the cosmetic increases, and as a result, excellent application durability can be obtained.

  Next, although an Example demonstrates this invention concretely, the bristle material for brushes of this invention is not limited to a following example at all unless the summary is exceeded.

[Example 1]
PBT resin (manufactured by Toray Industries, Inc., Toraycon 1200S) is used as the core material, and PET resin (Toray Co., Ltd., Toray Polyester resin T301T) is used as the sheath material. A composite structure monofilament having an octalo shape with an outer diameter of 0.10 mm and a circular cross section at the core is prepared, bundled and cut to a length of 50 mm, and then subjected to a chemical treatment with a sodium hydroxide solution. Thus, a bristle material for a brush having a tapered shape at one end, a circular cross section of the tapered portion, and an eight-leaf shaped non-tapered portion was obtained.

  The obtained hair material was planted around the shaft to obtain an eyeliner having a hair bundle diameter of 5 mm and a maximum hair length of 20 mm.

[Example 2]
An eyeliner was obtained in the same manner as in Example 1 except that a polyester elastomer resin (manufactured by Toray DuPont Co., Ltd., Hytrel 7247) was used as the raw material for the sheath portion.

Example 3
An eyeliner was obtained in the same manner as in Example 1, except that the cross-sectional shape of the sheath was a square.

[Comparative Example 1]
Using only PBT resin (Toraycon 1200S, manufactured by Toray Industries, Inc.), a monofilament with a circular cross section with an outer diameter of 0.10 mm was prepared, and this was subjected to the same chemical dissolution treatment as in Example 1 to produce a tapered portion and a non-tapered portion. An eyeliner with a circular cross section was obtained for each part.

[Comparative Example 2]
The monofilament core part shape was the same as that of Comparative Example 1 except that the same shape as the sheath part of Example 1 was used, so that an eyeliner having an 8-leaf cross section was obtained for both the tapered part and the non-tapered part. .

  In addition, the evaluation method of the brush using each bristle material for brushes was performed as follows.

[Evaluation of coating performance]
A continuous line was drawn on the paper with an eyeliner brush containing liquid cosmetic (Shiseido: ff Planetarium Eyes Pearl Blue), and the length of the uniform line was measured. The evaluation criteria were as follows.
A ... 30cm-35cm
B ... 25cm-30cm
C ・ ・ 20cm ～ 25cm

[Usage evaluation]
Using the same liquid cosmetic as in the application performance evaluation, 20 users were monitored for touch. The evaluation criteria were as follows.
1. Tactile feel that is flexible and comparable to animal hair 2. Not particularly good tactile, but no problem in practical use 3. Feels irritation to skin and bad tactile

  The above evaluation results are shown in Table 1.

  As is clear from the results in Table 1, the surface of Comparative Example 2 in which the bristle material is made of PBT resin and the whole has an eight-leaf cross section is higher in coating performance than Comparative Example 1 in which the whole has a circular cross section, but its surface It can be seen that the feeling of use is inferior due to the unevenness.

  On the other hand, Examples 1 and 2 in which the main body part has an eight-leaf shaped cross section and the tapered part has a circular cross section have excellent usability while being similar to Comparative Example 2, and are comparable to Comparative Example 1. I understand that. The same applies to the case of the third embodiment in which the main body has a square cross section.

  The bristle material for brushes of the present invention has excellent coating performance and usability, and can be applied to various brush applications, but exhibits a useful effect particularly when applied to a makeup brush application.

The side view which shows an example of the bristle material for brushes of this invention. (A) is AA sectional drawing of FIG. 1, (b) is BB sectional drawing similarly. (C)-(e) is sectional drawing which shows the example of the other core-sheath structure composite monofilament which can be used by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bristle 2 Body part 3 Tapered part 4 Core part 5 Sheath part

Claims (5)

A bristle material for a brush in which a tapered portion is formed on at least one end of a bristle made of a synthetic resin monofilament, and the sectional shape perpendicular to the fiber axis direction of the tapered portion is a circular sectional shape, and the sectional shape of the main body portion other than the tapered portion is irregular. A bristle material for a brush characterized by having a cross section. The bristle material for a brush according to claim 1, wherein a cross-sectional shape of the main body portion other than the tapered portion is a multi-leaf shape. Sheath structure in which the core portion has a circular cross section, the melt-spun as sheath becomes different shape cross-section with a fast synthetic resin chemical dissolution rate than the synthetic resin of the core portion using a slow synthetic resin chemical dissolution rate The method for producing a brush hair material according to claim 1 or 2, wherein the composite monofilament is a cut bristle, and a taper portion is formed at least at one end of the cut bristle bundle by chemical treatment. A brush comprising the brush bristle material according to claim 1 or 2 as at least a part of the bristle material. The brush according to claim 4, wherein the brush is a makeup brush.

Images