JPH11253236A - brush - Google Patents

Abstract

(57) [Problem] To provide a brush provided with bristles excellent in both coloring property and light resistance. SOLUTION: Hair for planting hair on a brush is made of synthetic resin containing 0.05 to 0.2% by weight of titanium oxide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush provided with bristles having excellent coloring and light fastness.

[0002]

2. Description of the Related Art Hairs used for brushes, especially toothbrushes, are made of polyamide (for example, 6-10 nylon, 6-12 nylon).
Nylon and the like and polyester (for example, polybutylene terephthalate and the like) are used, and colored hair in which various coloring agents are blended in addition to natural hair as necessary is used.

[0003]

When coloring hair made of synthetic resin, various coloring agents are added in accordance with the desired color. However, when coloring into white or light colors, the hiding power of the resin is reduced. Titanium oxide has been used to increase this. In general, synthetic resins tend to be degraded by light.In particular, photodegradation of polyamides and polyesters is caused by oxidation, radical decomposition and specific decomposition caused by active oxygen atoms generated by the catalytic action of titanium oxide when titanium oxide is blended. It is said that the degradation occurs due to the direct decomposition of the main chain due to the wavelength ("Fiber and Industry", vol. 40, No. 7, 1984, weather resistance of synthetic fibers).

[0004] Conventionally, toothbrushes are generally sold in individual packaging, and a large amount of ultraviolet light is prevented from being applied to the toothbrush by incorporating an ultraviolet absorber into the individual packaging. Did not. However, in recent years, it has been found that the individual packaging of the toothbrush has become a thin transparent film as a whole, and the bristle of the brush is deteriorated by light depending on the situation at the store. The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a brush having bristles excellent in both coloring property and light resistance.

[0005]

To achieve the above object, the brush of the present invention has a titanium oxide content of 0.05 to 0.2.
Hairs made of synthetic resin blended by weight% are planted. In addition, it is preferable to use polyamide or polyester as the hair made of the synthetic resin.

[0006]

When the hair used for the brush is colored white or light, titanium oxide is required to increase the hiding power of the resin. The greater the blending amount, the higher the hiding power of the resin. However, when titanium oxide is blended, as described above, degradation occurs due to oxidation caused by active oxygen atoms generated by the catalytic action of titanium oxide, radical decomposition and direct decomposition of the main chain at a specific wavelength, and as brush hair. Physical properties and mechanical strength are not satisfied.

Therefore, the present inventor has conducted various experimental studies to obtain hair having excellent light fastness while satisfying the coloring properties of the hair, and as a result, the titanium oxide was added in an amount of 0.05 to 0.2% by weight. And more preferably 0.1 to 0.2% by weight. When titanium oxide is blended in such a blending amount, it is possible to obtain brush hair that satisfies coloring properties and has high light resistance.

[0008]

Embodiments of the present invention will be described below. Titanium oxide is added to the hair made of synthetic resin.
A hair containing 0.5 to 0.2% by weight was prepared and subjected to a light resistance test using a carbon arc (JIS B 7751). Irradiation with a carbon arc for 50 hours did not cause any significant deterioration, and there was no particular problem in actual use, and the coloring property was sufficiently satisfied. In particular, the effect was remarkable at a blending amount of 0.1 to 0.2% by weight. In addition, when this bristles were used for a toothbrush, the brushing effect and durability of the flocked portion were equivalent to those of natural bristles containing no titanium oxide.

On the other hand, if titanium oxide is added in an amount of more than 0.2% by weight, for example, 0.3% by weight or 0.5% by weight
In the case of (1), remarkable deterioration occurred when the carbon arc was irradiated for 50 hours, and in the case of a toothbrush, breakage was likely to occur during actual brushing. Further, the amount of titanium oxide is set to 0.0
When the content was 5% by weight or less, sufficient coloring properties could not be obtained.

Particularly, in the case of a toothbrush, polyamide (for example, 6-10 nylon, 6-12 nylon, etc.) or polyester (for example, nylon) is used as a hair made of a synthetic resin in terms of usability, cleaning effect, and durability. It is preferable to use polybutylene terephthalate).

The thickness of the bristles can be arbitrarily selected according to the intended use.
Hair having a thickness of 0 mil (0.127 to 0.254 mm) is suitable. Needless to say, tapered bristles or bristled bristles with four or six divided ends as shown in Japanese Utility Model Laid-Open No. 6-154 and Japanese Unexamined Patent Publication No. 141923/1994 may be used. In addition, the bristle cross-sectional shape may be an ellipse, a triangle, a quadrangle, a hexagon, a rectangle, or the like, in addition to a circle, and is not particularly limited.

As a material for the brush handle, a natural material such as wood or a synthetic resin can be used, but a thermoplastic resin is more preferable in terms of productivity. For example, polypropylene, polyethylene, polyester, polyamide,
Polymethyl methacrylate, ABS and the like can be used.

[0013] The method of fixing the hair to the brush handle includes a method of fixing the hair using a metal piece (flat wire) in a hair implantation hole provided in a hair implantation portion of the brush handle, and a method of fixing the hair to a brush handle.
No. 25, JP-A-61-268208, JP-A-2-11
For example, an in-mold method shown in Japanese Patent Application Laid-Open No. 1305, a thermal fusion method shown in Japanese Patent Publication No. 6-46962, Japanese Patent Application Laid-Open No. 2-99002, and the like can be appropriately selected and used.

The titanium oxide crystals are classified into rutile type and anatase type, and are not particularly limited in the present invention.
A rutile type having more excellent hiding power and coloring power is more preferable.

[0015]

As described above, according to the present invention, since hairs made of synthetic resin containing 0.05 to 0.2% by weight of titanium oxide are implanted, both coloring and light resistance are improved. An excellent brush can be obtained.

Claims (2)

[Claims] 1. A brush wherein hairs made of synthetic resin containing 0.05 to 0.2% by weight of titanium oxide are implanted. 2. The brush according to claim 1, wherein the hair made of the synthetic resin is polyamide or polyester.