JPH1175938A - Toothbrush handle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent printed characters and patterns from disappearing by providing a transparent urethane resin film on the surface of a synthetic resin brush handle molding. SOLUTION: A brush handle molding 1 made by extrusion is made up of a bristled portion 2 and a neck portion 3 and a grip portion 4. The neck portion 3, the grip portion 4 or both parts 3, 4 of the brush handle molding 1 bear characters and patterns 5 printed on prescribed positions by hot stamping, silk screen or tampon printing when necessary. Or to increase the adhesiveness to the brush handle molding of an urethane resin film 6, the surface of the brush handle molding 1 is treated with UV cleaning or plasma treatment. After that, the entire surface including the part thereon is covered with an urethane resin film 6. As printing can be made clearly and easily, resists stains and wear, printed characters and patterns do not disappear even after a long use. It is characterized by a slip prevention effect, a feeling of rubber, an up-scale look, and artistic quality.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush handle comprising a flocked portion, a neck portion and a grip portion, which is rich in tactile sensation and design and is easy to use in toothbrushes, body brushes, hair brushes and other brushes. It is about.

[0002]

2. Description of the Related Art A conventional brush handle 1) is formed into a brush handle molded product a having a shape shown in FIG. 3, for example, by injection molding and then hot stamping, silk printing, tampo printing or the like. A letter or pattern is printed on it to give it a design. 2) The inner surface of the cavity corresponding to the grip portion of the brush handle molding die is roughened in advance by blasting or the like, and then the resin is poured. ,
A brush handle formed by multicolor molding using two or more types of resin as shown in FIG. A material having a design effect by changing the color or material of part d of object c, or having a tactile sensation or anti-slip effect by using an elastomer material here (Japanese Patent Laid-Open No. 2-71710).
No. 7-327737).

[0003]

However, after the molding, the brush handle a) described in 1) above, which is printed with a hot stamp or the like.
Is that the character (pattern, etc.) is easily erased because the hand (finger) is directly touched and rubbed during use, and the gripping portion is easily scratched. And so on. In order to solve this problem, it was considered to improve the material and adhesive strength of the transfer foil itself such as a hot stamp.However, the transfer foil itself is expensive and increases the cost, and it is necessary to improve the adhesive strength sufficiently. could not. A method of making the brush handle less likely to be scratched by increasing the surface hardness of the brush handle has been considered. However, since the overall rigidity of the brush handle is increased, there is a possibility that the practicality of the product may be lost.

[0004] The brush handle of the above 2), which has irregularities on the surface for preventing slippage, has a drawback that the printability is poor due to the irregularities on the surface and characters and patterns cannot be clearly provided. In the brush handle of the above 3) by two-color molding, a hard synthetic resin material such as a polypropylene resin or a polyester resin is used as a main material, and the exterior material or a place where a hand (finger) directly touches, that is, a part d, It is integrally molded using flexible elastomeric material such as styrene-butadiene copolymer and thermoplastic resin such as polyolefin, polyurethane and polybutadiene, but printed on the surface of these elastomeric materials. Even if it is attempted, printing is difficult due to the characteristics of the material, and good characters and patterns b cannot be obtained. In addition, although the exterior material made of an elastomer material has a low hardness and a non-slip effect can be obtained, there is also a problem that the exterior material is easily stained and easily worn.
Furthermore, the design was limited in terms of design, and it was impossible to impart a rubber feeling to the brush handle.

Accordingly, it is an object of the present invention to provide a method for printing a character and a pattern which can be printed clearly and easily, and which is hardly stained even with two-color molding and has high abrasion resistance. An object of the present invention is to provide a high-class brush handle having a good anti-slip effect and a good rubber touch with excellent design properties that do not disappear.

[0006]

As a result of various studies, the present inventor has found that when the surface of a brush handle molded product is coated with a transparent urethane resin film, it is not a two-color molded product using an elastomer material. In addition to providing a good anti-slip effect and a rubbery feel, the surface of the brush handle is hardly stained and has high abrasion resistance. That can be kept indefinitely without stains and patterns,
In addition, they have found that a brush handle with excellent design and high-grade feeling can be obtained, and thus completed the present invention.

The brush handle of the present invention is characterized in that a transparent urethane resin film is provided on the surface of a synthetic resin brush handle. The above-mentioned brush handle molded product has a printed surface or a UV-cleaned or plasma-treated surface, particularly the surface of the neck portion, the grip portion, or both of the brush handle molded product. preferable. Further, these synthetic resin brush handle moldings may be two-color integral moldings.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 shows a first embodiment of a brush handle of the present invention. FIG. 1 (a) is a plan view and FIG. 1 (b).
3A is a longitudinal sectional view taken along the line AA of FIG. 1A, and FIG. 3C is a longitudinal sectional view taken along the line BB of FIG. 2A and 2B show a second embodiment of the present invention, in which FIG. 2A is a plan view, FIG. 2B is a longitudinal sectional view taken along line CC of FIG. 2A, and FIG. It is a longitudinal section along the DD arrow line of (a).

In FIG. 1, reference numeral 1 denotes a brush handle molded product made by injection molding or the like, which comprises a flocked portion 2, a neck portion 3, and a grip portion 4. The neck 3 of the brush handle molding 1;
The gripper 4 or both parts 3, 4 (in the figure, the gripper 4
Only), if necessary, characters or patterns 5 are printed at predetermined positions on the surface by hot stamping, silk printing or tampo printing, or urethane resin film 6 is applied to brush handle molding 1. In order to improve the adhesiveness, the surface of the brush handle molding 1 is subjected to UV cleaning or plasma treatment, and then the entire surface including the surface is coated with a urethane resin film 6.
Cover with. This coating is achieved by spraying and applying a urethane-based resin coating, dipping in the same liquid, and then heating and drying.

The material constituting the brush handle molded product 1 includes styrene resins such as polystyrene, acrylonitrile / styrene (hereinafter, referred to as AS), acrylonitrile / butadiene / styrene (hereinafter, referred to as ABS), polyethylene, and polypropylene. Polyolefin resins, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polycarbonate resins such as polycarbonate and polycarbonate / ABS, cellulose resins such as cellulose acetate / propionate resins, cellulose propionate resins and cellulose acetate, etc. , Polyamide, polyacetal, polymethylpentene, methyl methacrylate, polyarylate resins, and the like. These may be used alone or in combination of two or more. Used together look. These materials are suitable as brush handle moldings because they share some of the properties such as strength, flexibility, resistance to breakage, washability, stain resistance, design and cost.
Among them, a polypropylene resin or a methyl methacrylate resin is preferable because it satisfies many of the above characteristics.

The urethane-based resin coating used for forming the urethane-based resin film 6 is a two-pack type urethane-based resin coating obtained by blending a polyol and an isocyanate at a ratio of about 1: 4. The system resin film has a hardness of approximately F to H in a pencil hardness test, and has transparency, a soft and soft touch feeling. The thickness is preferably from 5 to 100 μm, particularly preferably from 15 to 50 μm, because the soft feeling is enhanced. If it is less than 5 μm, a desirable rubber touch cannot be obtained, and if it exceeds 100 μm, the coating film will have uneven thickness, which is not preferable in appearance. With this coating, the brush handle molded article 1 has a good anti-slip effect with little dirt on the surface and a high abrasion resistance and a rubber touch. Also,
If characters and patterns are printed at predetermined positions in advance, the printed characters and the like will not be stained and can be kept clear forever.

In FIG. 2, reference numeral 11 denotes two-color injection molding.
This is a brush handle molded product in which the main material 11a and the exterior material 11b are integrally molded as a primary or secondary molded product, respectively. The overall shape is the same as the brush handle molded product 1 shown in FIG.
It consists of a flocked part 2, a neck part 3 and a grip part 4, and the neck part 3,
The gripper 4 or both parts 3, 4 (in the figure, the gripper 4
The exterior material 11b only) is printed with the same character or pattern 5 as necessary, or the surface is subjected to UV cleaning or plasma treatment, and then the entire surface including the surface is coated with a urethane resin. Coated with membrane 6 in a similar manner.

As the material constituting the main material 11a, it is preferable to use the same resins as those used in the brush handle molding 1 because some of the above-mentioned characteristics are shared. They are used in combination of two or more kinds. Among them, a polypropylene resin or a methyl methacrylate resin is preferable because it satisfies many of the above characteristics.

The material forming the exterior material 11b is more flexible than the material forming the main material 11a.
Polystyrene, polyolefin, polyurethane,
Polyester-based, polyamide-based, 1,2-polybutadiene-based, ethylene-vinyl acetate-based, polyvinyl chloride-based, natural rubber-based, fluororubber-based, trans-polyisoprene-based, chlorinated polyethylene-based thermoplastic elastomers,
Propylene-butadiene, styrene-butadiene, A
In addition to elastomers such as copolymer resins of S and ABS, methyl methacrylate resin, polyester resin and the like are exemplified, and these are used alone or in combination of two or more. Of these, copolymer resins such as propylene / butadiene, styrene / butadiene, and AS are preferable because they satisfy the many properties of the resin used in the brush handle molding 1 together with flexibility.

[0015]

EXAMPLES Hereinafter, specific embodiments of the present invention will be described with reference to Examples and Comparative Examples. [Example 1] Methyl methacrylate resin (PMM in the table)
A, hereinafter the same): A brush handle molded product having the same shape as that shown in FIG. 1 was obtained by injection molding using Delpet 6500 (trade name, manufactured by Asahi Kasei Corporation). A urethane-based resin paint: Lavasan (trade name, manufactured by Musashi Paint Co., Ltd.) was applied to the entire surface of the grip portion to form a urethane-based resin film having a thickness of 40 μm. Table 1 shows the results of observing the coating strength, anti-slip effect, appearance (high-grade appearance and design) of the obtained product, and the degree of scratches and dirt on a transport test.

Example 2 Polypropylene resin (in the table,
PP; hereinafter the same): A brush handle molded product having the same shape as that shown in FIG. 1 was obtained by injection molding using Novatec PP MX3 (manufactured by Nippon Polychem Co., Ltd.). A pattern similar to that shown in FIG. 1 was printed on the gripping portion by hot stamping, and then the entire surface of the gripping portion was coated with a urethane-based resin paint: Rabasan (described above), and a urethane-based resin film having a thickness of 30 μm was formed. Was formed. With respect to the obtained product, the printing strength was observed in addition to the tests performed in Example 1. The results are shown in Table 1.

Example 3 As a primary molded product, methyl methacrylate resin: Delpet 6500 (described above) was used as a main material.
In addition, as a secondary molded product, an AS copolymer resin (referred to as AS in the table): Stylac (trade name, manufactured by Asahi Kasei Kogyo Co., Ltd.) for a part of the outer packaging material of the grip portion, and two-color injection molding. 2
A brush handle molded product having the same shape as that shown in (1) was obtained. After a pattern was printed on the exterior material surface of the grip portion in the same manner as in Example 2, the entire surface of the grip portion was coated with a urethane resin paint:
When the Lavasan (described above) was painted with a thickness of 40 μm, a brush handle with a further non-slip effect was obtained with an even higher quality. Table 1 shows the results of the same test as in Example 2 for this.

Example 4 The surface of the grip portion of the brush handle molding obtained in the same manner as in Example 2 was subjected to UV cleaning, and then a urethane-based resin coating material: Lavasan (described above) was applied.
When applied at 20 μm, a brush handle with improved adhesion of the urethane resin paint was obtained. Table 1 shows the results of the same tests as those performed in Example 1.

[Comparative Example 1] A brush handle molded product was obtained in the same manner as in Example 2 using a mold having an inner surface provided with irregularities for preventing slippage. When a pattern similar to that shown in FIG. 1 was printed with a hot stamp, the unevenness of the gripping portion of the obtained product was insufficient as a non-slip, had no luxury, and the printing was easily peeled off. Oops. Table 1 shows the results of the test performed in the same manner as in Example 2.

[Comparative Example 2] Polypropylene resin: J-900G
P (Idemitsu Petrochemical Co., Ltd., trade name) as the main material, and a polyolefin elastomer: TPE3650 (Sumitomo Chemical Co., Ltd., trade name) as the exterior material of the gripping part, and the brush handle is formed by two-color injection molding. Then, the same pattern as that shown in FIG. 1 was printed on the exterior material surface of the gripping portion by hot stamping or tampo printing, and the obtained product was subjected to the same test as in Example 2, and the results are shown in Table 1. Indicated. This product had an anti-slip effect on the grip portion, but was easily stained, and the peel strength of the printed surface was very low.

[0021]

[Table 1]

[0022]

According to the brush handle of the present invention, printing can be performed clearly and easily, and since it is hard to be stained and has high abrasion resistance, printed letters and patterns disappear after a long use. It has excellent effects such as a good anti-slipping effect and a rubbery touch, and a high quality and high design.

[Brief description of the drawings]

1A and 1B relate to a first embodiment of a brush handle of the present invention, in which FIG. 1A is a plan view, FIG. 1B is a longitudinal sectional view taken along the line AA of FIG. 1A, and FIG. It is a longitudinal cross-sectional view which follows the BB arrow line of a).

2A and 2B relate to a brush handle according to a second embodiment of the present invention, wherein FIG. 2A is a plan view, FIG. 2B is a longitudinal sectional view taken along the line CC of FIG. 2A, and FIG. It is a longitudinal section along the DD arrow line of a).

FIG. 3 is a plan view showing an example of a conventional brush handle.

FIG. 4 is a plan view showing another example of a conventional brush handle.

[Explanation of symbols]

1, 11 ‥ brush handle molding, 2 ‥ flocked part, 3 ‥
Neck, 4 系 grip, 5 letters and patterns, 6 ‥ urethane resin film.

Claims (4)

[Claims] 1. A brush handle comprising a synthetic resin-made brush handle having a transparent urethane resin film formed on a surface thereof. 2. The brush handle according to claim 1, wherein the surface of the brush handle molding is printed. 3. The surface of the brush handle molding is made of UV.
2. A cleaning or plasma-treated one.
The described brush handle. 4. The brush handle according to claim 1, wherein the synthetic resin brush handle molding is a two-color integral molding.