JP2001314803A - Application tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an application tool for applying an erasing liquid, a writing ink and a liquid cosmetic preparation on the surface of a substrate to be applied such as a paper surface. SOLUTION: The application tool is provided with an axis body composed of a vessel storing an ink or a coating liquid therein and has a discharging mechanism part of the ink or the coating liquid at the end of the axis body wherein the axis body is characterized by comprising a dual-layer structure blow molded body of the following (1) or (2): (1) a dual-layer structure blow molded body comprising a mixed layer of an olefin type resin and an adhesive resin, and a gas barrier resin layer; or (2) a dual-layer structure blow molded body comprising an olefin type resin layer, and a mixed layer of a gas barrier resin and an adhesive resin. Thus, the coating tool is capable of lowering a cost by enabling the coating of being formed and obtained by a dual-layer type blow molding machine with the minimum mechanism without deteriorating the molding property and the required quality.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an applicator for applying an application liquid such as a correction liquid or a liquid cosmetic or an ink such as a writing implement ink to a surface to be applied such as paper.

[0002]

2. Description of the Related Art In a conventional applicator, a blow container in which polypropylene (PP) or a part thereof is made of an engineering plastic material,
There are already many commercially available containers in which a container procured by injection molding is used as a shaft body and ink or a coating liquid is incorporated in the shaft body.

In recent years, in multilayer blow containers (such as two-three-layer, three-three-layer, three-three-layer, etc.) for fragrance retention and antioxidant applications, the inner layer is made of a material that does not react with contents such as liquids and inks. (For example, PE, PP), the intermediate layer is made of a gas barrier resin in order to secure gas barrier properties, and the outer layer is made of a normal material (for example, PE, PP). For example, in a mayonnaise container, squeeze performance is required, so five types of layers are used, PE is used for the inner layer (first layer) and the outer layer (fifth layer), and the intermediate layer (third layer) is used. A relatively expensive gas barrier resin is used as the material, and the thickness of the intermediate layer is about 0.1 mm. The second and fourth adhesive layers are made of a resin compatible with the inner layer, the outer layer and the intermediate layer, respectively.
mm.

[0004] However, when the above-mentioned containers of three types and five layers are used for the shaft of the applicator, there is a problem in that the molding equipment becomes large and costs are increased. There is a problem that the occurrence of the problem increases.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and aims to solve the problem.
It is an object of the present invention to provide an applicator capable of reducing the cost by reducing the formability and required quality, enabling molding procurement with a two-layer blow molding machine using a minimum mechanism.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned conventional problems, and as a result, it has been found that molding procurement by a two-layer blow molding machine with a minimum mechanism is possible. By suitably combining the olefin-based resin with the gas-barrier resin and the adhesive resin, the above-described applicator was successfully obtained, and the present invention was completed. That is, the applicator of the present invention has [1] to
[5]. [1] An applicator having a shaft main body composed of a container containing ink or a coating liquid, and having an ink or coating liquid discharge mechanism at a tip end of the shaft main body, wherein the shaft main body is as follows (1) or (2) An applicator comprising a blow molded article having a two-layer structure. (1) A blow molded article having a two-layer structure comprising a mixed layer of an olefin resin and an adhesive resin and a gas barrier resin layer. (2) A blow molded article having a two-layer structure comprising an olefin-based resin layer and a mixed layer of a gas barrier resin and an adhesive resin. [2] The amount of the adhesive resin in the mixed layer is 20 to 40% by weight.
The applicator according to [1] above. [3] The applicator according to the above [1] or [2], wherein the olefin-based resin is at least one selected from a polyethylene resin, a polypropylene resin, and a polymethylpentene resin. [4] The applicator according to the above [1] or [2], wherein the adhesive resin is an adhesive polyolefin resin. [5] The applicator according to the above [1] or [2], wherein the gas barrier resin is an ethylene-vinyl alcohol copolymer resin. The “applicator” defined in the present specification is a correction pen for applying the correction liquid to the surface to be applied, a ballpoint pen for writing ink on the surface to be applied, a writing implement such as a marking pen, a liquid cosmetic. Refers to a makeup tool or the like that is filled so as to apply the same.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIGS. 1A and 1B show an example of an embodiment of the applicator of the present invention, and the applicator 10 of the present embodiment is used as a writing instrument (pen for marking).

The blow molded article having a two-layer structure constituting the shaft main body 11 of the applicator 10 includes, for example, (1) a mixed layer 11a (11b) of an olefin resin and an adhesive resin;
A blow-molded article having a two-layer structure composed of a gas-barrier resin layer 11b (11a) and (2) an olefin-based resin layer 11a
(11b) and a blow molded article having a two-layer structure composed of a mixed layer 11b (11a) of a gas barrier resin and an adhesive resin.

As the olefin resin used for the blow molded article, for example, polyethylene resin (PE), polypropylene resin (PP), polymethylpentene resin (T
PX), and specifically, KB165A (HDP manufactured by Nippon Polyolefin Co., Ltd.)
E), HY540 (HDPE) manufactured by Nippon Polychem, EZ-112 (PP) manufactured by Showa Denko, EZ7 (PP) manufactured by Nippon Polychem, and MX002 (TP) manufactured by Mitsui Chemicals, Inc.
X) and the like.

As the adhesive resin used for the blow molded article, those having compatibility with the olefin resin and the gas barrier resin are preferable, and examples thereof include an adhesive olefin resin such as a maleic anhydride-modified polyolefin. Can be Specific examples include Modic L-502 and L-400F manufactured by Mitsubishi Chemical Corporation and Admar LB-530 manufactured by Mitsui Chemicals. Examples of the gas barrier resin used for the blow molded article include, for example, ethylene-vinyl alcohol copolymer resin (EVOH) having excellent gas barrier properties. Specifically, Soarnol AT4403 (manufactured by Nippon Synthetic Chemical Co., Ltd.) EVOH) and EVAL EP-F101 (EVOH) manufactured by Kuraray Co., Ltd. The above-mentioned "ethylene-vinyl alcohol copolymer resin" (EVOH) is a saponified product of ethylene-vinyl acetate copolymer (EVA), and has more excellent chemical resistance, solvent resistance and gas barrier properties than EVA. The feature is that the ethylene content (usually 27-47 mol%)
There are various grades depending on the application of coating tools (correction pens, ballpoint pens, marking pens, makeup tools, etc.), and
EVOH having an optimum ethylene content can be adapted by considering ink or coating solution.

The blow molded body having a two-layer structure constituting the shaft main body 11 can be manufactured by using a two-layer blow molding machine using each of the above resins. Specifically, the following or the following modes are mentioned. The olefin resin (A) and the adhesive resin (B) are mixed in advance by dry blending, and this mixture is charged into an outer hopper or inner hopper of a two-layer blow molding machine, and the remaining gas barrier properties are mixed. By blowing and molding the resin (C) into the hopper for the inner layer or the hopper for the outer layer, a blow molded article having a two-layer structure (two types and two layers) can be manufactured. The compounding ratio of each resin in this case is set so as to be a suitable compounding ratio depending on the use of the applicator, the built-in ink or the coating liquid, etc., and the mixed layer (A: B)
Is preferably 70:30 to 50:50 by weight, and the mixing ratio between the mixed layer (A and B) and the gas barrier resin (C) is 80:80 by weight. 20 ~
Preferably, the ratio is 60:40. The adhesive resin (B) and the gas barrier resin (C) are previously mixed by dry blending, and this mixture is charged into an outer hopper or inner hopper of a two-layer blow molding machine, and the remaining olefin-based resin is blown. By blowing the resin (A) into the hopper for the inner layer or the hopper for the outer layer and molding, a blow molded article having a two-layer structure (two types and two layers) can be produced. In this case, the compounding ratio of each resin is set so as to be a suitable compounding ratio depending on the use of the applicator, the built-in ink or the coating liquid, etc., and the mixed layer (B: C)
Is preferably 70:30 to 40:60 by weight, and the mixing ratio between the mixed layer (B and C) and the olefin-based resin (A) is 60:40 by weight. ~ 4
0:60 is preferable.

In the present invention, the two-layer blow molding method is performed by using a two-layer blow molding machine, for example, a Hesta double head machine specification manufactured by Heester, Inc., at a resin temperature of 180.degree.
Two-layer blow molding can be performed at 40 ° C., a mold temperature of 26 ° C., and a cycle time of 11 sec. In addition, when preparing the above or each mixture, the amount of the adhesive resin is from 20 to 40% by weight based on the total amount of the mixture (layer) from the viewpoint of improving the mixing effect and improving the physical properties of the molded article. Preferably,
It is desirable that the content be 25 to 30% by weight. If the amount of the adhesive resin is less than 20% by weight, a sufficient effect of compatibility between the gas barrier resin and the olefin resin cannot be obtained.
If it exceeds 0% by weight, the required effect becomes excessive, and the cost increases, which is not preferable. In addition, when preparing the above or each mixture, liquid paraffin (for example, Moresco White P-55, manufactured by Matsumura Petroleum Institute Co., Ltd.)
A blended oil such as the above may be blended. The blending amount of the blended oil is 1 to 10% by weight based on the total amount of the mixture,
Preferably, the content is 1 to 5% by weight.

The thickness (thickness) of the shaft main body 11 obtained by each of the above-mentioned processes varies depending on the use of the applicator, the content liquid such as ink or cosmetic liquid to be filled in the shaft main body 11, and the like.
m to 1.2 mm, preferably 0.8 to 1.2 mm. If the thickness (thickness) is less than 0.5 mm, the transmittance of the content liquid such as ink or cosmetic liquid becomes high, so that an optimal shaft main body for the applicator of the present invention cannot be obtained, and the strength is poor. This is sufficient, and moreover, the molding becomes more difficult. When the thickness (thickness) exceeds 1.2 mm, the effect of the present invention is not changed, but the molding becomes more difficult and the cost tends to increase. In addition, the thickness of each layer such as an olefin-based resin layer or a mixed layer thereof, a gas barrier resin layer or a mixed layer thereof,
The thickness varies depending on the content liquid such as ink or cosmetic liquid, and the thickness of each layer varies within the range of 0.8 to 1.2 mm.

The ink or coating liquid to be filled in the shaft body 11 may be a normal correction pen, a ballpoint pen, a marking pen,
There is no particular limitation on the ink or coating solution used for cosmetics, including the solvent to be contained, and the most suitable ink for the application of the applicator (correction pen, ballpoint pen, marking pen, cosmetics, etc.) Alternatively, a coating solution is prepared.

FIG. 1 (a) shows the tip of the shaft main body 11.
As shown in the figure, the front shaft 12 is fixed. Further, a writing implement ink 13 and a stirring ball 14 are built in the shaft main body 11. A discharge mechanism 21 including a valve body 19 having a valve rod 15, a spring receiver 16, a spring 17, and a valve seat 18 and a pen core 20 is provided in the shaft main body 11 and the front shaft 12. In addition, 22 is an ink occluding material, 2
3 is a cap.

In the applicator 10 of the present embodiment configured as described above, the shaft main body 11 is formed into a two-layer blow-molded structure composed of (1) a mixed layer of an olefin resin and an adhesive resin and a gas barrier resin layer. Since it is a blow molded body with a two-layer structure consisting of a molded body or (2) an olefin resin layer and a mixed layer of a gas barrier resin and an adhesive resin, a two-layer blow molding machine with a minimum mechanism Thus, an applicator can be provided which can suppress the cost and reduce the moldability and required quality.

The applicator of the present invention is configured and used as described above, but is not limited to the above embodiment. The applicator of the present invention includes a shaft main body composed of a container containing ink or a coating liquid, and an ink applicator having an ink or coating liquid discharge mechanism at a tip end of the shaft main body. The gist of the present invention is that 11 is formed from a blow molded article having a two-layer (two-type, two-layer) structure having the above-described structure. It is not limited.

In addition, as long as the discharge mechanism can discharge a content liquid such as ink or a coating liquid, the discharge mechanism may be a pen structure described in the above embodiment, or a brush structure, a ball-point pen structure or the like. The structure of the ejection mechanism is not limited at all.

Next, the present invention will be described more specifically with reference to Examples and Comparative Test Examples. In addition, this invention is not limited to a following example.

Example 1 Olefin resin: HDPE
(KB165A, manufactured by Nippon Polyolefin Co., Ltd.), gas barrier resin: EVOH (Eval EP-F101 (ethylene content: 40 mol%), manufactured by Kuraray Co., Ltd.), adhesive resin: Modick L-502 (manufactured by Mitsubishi Chemical Corporation) The shaft body was produced using a layer blow molding machine (manufactured by Hesta, Germany). Specifically, the olefin resin 6
0% by weight and 40% by weight of the adhesive resin are previously mixed by dry blending, and this mixture (70% by weight of the total amount) is put into an outer hopper of a two-layer blow molding machine.
EVOH was charged at 30% by weight of the total amount into an inner layer hopper and molded to produce a blow molded article having a two-layer structure (two types and two layers). The overall length L of the molded shaft body is 95
(Mm), body outer diameter W is φ14 (mm), mouth inner diameter is φ
7.6 (mm) and thickness (wall thickness) d were 1 (mm) [0.7 (mm) of the mixed layer, 0.3 (mm) of the EVOH layer]. The writing implement shown in FIG. 1 was produced using the shaft main body.

(Example 2) In the above-mentioned Example 1, the mixture was put into an inner hopper of a two-layer blow molding machine.
By blowing VOH into the outer layer hopper and molding, a blow molded article having the same two-layer structure (two types and two layers) as in Example 1 was produced.

Example 3 Olefin resin: HDPE
(HY540, manufactured by Nippon Polychem), a gas barrier resin: EVOH (Eval EP-F101 (ethylene content: 40 mol%), manufactured by Kuraray Co., Ltd.), and an adhesive resin: Modick L-502 (manufactured by Mitsubishi Chemical Corporation). The shaft main body was produced using a layer blow molding machine. Specifically, 50% by weight of the gas barrier resin and 50% by weight of the adhesive resin are mixed in advance by dry blending, and this mixture (60% by weight of the total amount) is used as an outer hopper for a two-layer blow molding machine. , And the olefin-based resin was charged into the inner-layer hopper at 40% by weight of the total amount, followed by molding to produce a blow-molded article having a two-layer structure (two types and two layers). The overall length L of the formed shaft main body is 95 (mm), and the body outer diameter W is φ14.
(Mm), inner diameter of the mouth is φ7.6 (mm), thickness (thickness) d
Is 1 (mm) [mixed layer 0.6 (mm), olefin layer 0.
4 (mm)]. The writing implement shown in FIG. 1 was produced using the shaft main body.

(Example 4) In Example 3, the mixture was charged into an inner hopper of a two-layer blow molding machine.
By blowing VOH into the outer layer hopper and molding, a blow molded article having the same two-layer structure (two types and two layers) as in Example 3 was produced.

(Example 5) Olefin resin: HDPE
(KB165A, manufactured by Nippon Polyolefin Co., Ltd.), gas barrier resin: EVOH (Soarnol AT4403 (ethylene content: 40 mol%), manufactured by Nippon Synthetic Chemical Co., Ltd.), adhesive resin: Modec L-502 (manufactured by Mitsubishi Chemical Corporation) The shaft main body was produced using a layer blow molding machine. Specifically, 60% by weight of the olefin-based resin and 40% by weight of the adhesive resin are mixed in advance by dry blending, and this mixture (70% by weight of the total amount) is supplied to an outer hopper of a two-layer blow molding machine. Then, 30% by weight of the gas barrier resin was charged into the hopper for the inner layer to produce a blow-molded article having a two-layer structure (two types and two layers). The overall length L of the molded shaft body is
95 (mm), body outer diameter W is φ14 (mm), mouth inner diameter is φ7.6 (mm), thickness (wall thickness) d is 1 (mm) [mixed layer 0.7 (mm) , EVOH layer 0.3 (mm)]. The writing implement shown in FIG. 1 was produced using the shaft main body.

(Comparative Test Example) Blowing of a two-layer structure (two-type three-layer structure) using the three types of resins of Example 1 above, with the inner layer being an EVOH layer, the intermediate layer being an adhesive resin layer and the outer layer being an HDPE layer. An applicator using a molded body having a shaft body (Comparative Example 1, control), a PP body having a single blow molded body as a shaft body (Comparative Example 2), and the above-described Examples 1 to 5, were prepared. The ink evaporation loss, impact resistance and fragrance retention were measured by the following evaluation methods. The overall length L, the body outer diameter W, the mouth inner diameter, and the thickness (thickness) of the molded shaft main bodies of Comparative Examples 1 and 2 are the same as those in Example 1. The composition of the ink, the amount of volatilization loss, the method for evaluating impact resistance and fragrance retention, and the like are as follows. The results are shown in Table 1 below.

(Blending composition of ink) Carbon black 10% by weight Resin 9% by weight Ethylene glycol 3% by weight Water 73% by weight Perfume 5% by weight

(Evaluation method of volatilization loss) The product of FIG. 1 filled with 8 g of the above ink was placed in a 50 ° C. constant temperature chamber, and after one month, the volatilization amount of the ink volatilized from the shaft body was measured by a measuring instrument. The evaluation was made according to the following evaluation criteria. Evaluation criteria: ◎: less than 150 mg ○: 150-200 mg ×: more than 200 mg (cannot be used as a product)

(Evaluation Method of Impact Resistance) The product was dropped on a cedar board floor from a height of 1.5 m, and the cracking property of the shaft body was visually evaluated according to the following evaluation criteria. Evaluation criteria: ：: No cracks occurred. ：: Some cracks are observed, but within the range that can be adopted as a product. X: Cracking occurred and could not be adopted as a product.

(Evaluation Method of Perfume Retention Property) For a product whose volatilization loss (1 month) was measured, the degree of scattering of the fragrance contained in the ink was written and sensory evaluated according to the following evaluation criteria. Evaluation criteria: A: The initial (immediately after filling) scent is maintained. ：: Slight scattering of scent, but residual scent is noticeable. ×: The scent has completely disappeared.

[0030]

[Table 1]

As is evident from the results in Table 1, Examples 1 to 5, which fall within the scope of the present invention, have the same performance as the two- and three-layer blow molded articles of Comparative Example 1 (control). In addition, it was found that, compared to the single PP blow-molded product of Comparative Example 2, it was excellent in volatilization loss, impact resistance and fragrance retention.

[0032]

According to the present invention, since the shaft main body can be constituted by a blow molded body having a two-layer, two-layer structure, it can be procured by a two-layer blow molding machine with a minimum mechanism, and cost can be suppressed. The present invention provides an applicator that is designed and does not lower moldability and required quality.

[Brief description of the drawings]

FIG. 1A is a partial cross-sectional view illustrating an example of an embodiment of an applicator of the present invention, and FIG. 1B is a partial cross-sectional view illustrating a two-layer structure of a shaft body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Applicator 11 Shaft main body 12 Front shaft 21 Discharge mechanism

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B43K 8/02 B43K 7/02 A B43L 19/00 8/02 C B65D 83/00 F B65D 83/00 J (72) Inventor Sachiyuki Sawa 1091, Tateishi, Fujioka-shi, Gunma F-term in Gunma R & D Center, Mitsubishi Pencil Co., Ltd. FA24 FA30 FA34 FA57 4F208 AA03 AA04 AA10 AA11 AG08 AH53 LB01 LB22 LG06 LW43

Claims (5)

[Claims] 1. An applicator having a shaft main body composed of a container containing ink or a coating liquid, and having an ink or coating liquid discharge mechanism at a tip end of the shaft main body, wherein the shaft main body is as follows: ) Or (2), which is a blow molded article having a two-layer structure. (1) A blow molded article having a two-layer structure comprising a mixed layer of an olefin resin and an adhesive resin and a gas barrier resin layer. (2) A blow molded article having a two-layer structure comprising an olefin-based resin layer and a mixed layer of a gas barrier resin and an adhesive resin. 2. The amount of the adhesive resin in the mixed layer is 20 to 40.
2. The applicator according to claim 1, wherein the amount is% by weight. 3. The olefin resin is a polyethylene resin,
The applicator according to claim 1, wherein the applicator is at least one selected from a polypropylene resin and a polymethylpentene resin. 4. The applicator according to claim 1, wherein the adhesive resin is an adhesive olefin resin. 5. The applicator according to claim 1, wherein the gas barrier resin is an ethylene-vinyl alcohol copolymer resin.