JPS61141477A - Marking material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvements in marking materials for markings used by being attached to outdoor signboards, gasoline tanks for two-wheeled vehicles, vehicle exterior panels, etc. More specifically, the present invention relates to an improvement in a breathable marking material that does not peel off, blister, etc. even if gas (outgas) is generated from an adherend to which it is attached.

[Conventional technology]

A conventional breathable marking material will be explained with reference to FIGS. 3 to 7.

The marking material shown in FIG. 3 has a structure in which an adhesive layer 2 is laminated on a base material 1, and then air vent holes 3 are mechanically or mechanically provided.

Next, the marking material shown in FIG. 4 has a structure in which the base material 1 is formed from a breathable fibrous material.

Next, the marking material shown in FIG. 5 has a structure in which an air permeable porous layer 4 made of foam, paper, fiber, etc. is provided between a base material 1 and an adhesive layer 2 (for example, Jitsukai Showa 59-9
Publication No. 0980).

Next, the marking material shown in FIG. 6 has a structure in which the adhesive layer 2 is made of foamed porous material.

Furthermore, as shown in Figure 7, although the marking material is non-permeable, the base material 1 is extremely thick (approximately 250 μm or more).
However, there was a structure that increased the strength of the base material and tried to contain outgas.

[Problem that the invention seeks to solve]

However, the marking material shown in FIG.
When a desired marking (usually formed by printing methods such as offset, gravure, screen, etc., or coating methods such as roll coating, knife coating) is applied to the marking material, if the pore size is too large, the surface condition will be poor and the gloss will be poor. It is also defective and cannot be put to practical use. Furthermore, if the hole diameter is too small, the hole will be crushed during marking formation, resulting in poor air permeability, which is undesirable, making it extremely difficult to process the hole diameter and resulting in poor workability.

In the marking material shown in FIG. 4, the mechanical strength of the base material is low, so it is easily damaged, and the surface smoothness of the base material is also poor, making it difficult to obtain a glossy marking.

Next, the marking material shown in Fig. 5 has a low mechanical strength of the porous layer, so it is not only easy to cause layer destruction, but also when attached to an adherend that generates a large amount of gas (for example, a molded (adhering to other RIM bumpers or FRP boards, or adhering to polyethylene containers filled with gasoline), the gas cannot escape to the outside, causing blisters, etc.

Next, the marking material shown in FIG. 6 has a low adhesive strength and is easily peeled off from the adherend, and it also cannot release a large amount of gas to the outside, similar to the marking material shown in FIG. Causes swelling etc.

Furthermore, the marking material shown in FIG. 7 poses no problem for a short period of time after being applied to an adherend, but as time passes, problems such as blistering and peeling occur.

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to provide a marking material that can be marked with a good appearance and that does not cause problems such as peeling or blistering even when attached to an adherend that generates a large amount of gas. With the goal.

[Means for solving problems]

To explain the marking material of the present invention with reference to FIG. 1, the base material 1 has an average pore diameter of 0.2 μTfL to 50 μT, and an air flow rate of 2 seconds/10 measured using the JIS P8117 Gurley method.
0cc~120 seconds/100. cc, a continuous porous plastic film with a thickness of 20 μm or more; and has a structure in which an adhesive layer 2 is laminated on one side of a base material 1. Note that a release material may be further laminated on the adhesive layer 2 to facilitate handling of the marking material.

The base material used for the marking material of the present invention has an average pore diameter of 0.2μ? FL ~ 50μm 1 ventilation rate is 2 seconds/100cc
~120 seconds/100cc (JISP8117 Gurley type)
It is a continuous porous plastic film with a thickness of 20 μm or more. If the average pore diameter is less than 0.2 μm, the pores will be blocked by the markings formed on the marking material, resulting in poor air permeability, which is undesirable; if it exceeds 50 μm, the appearance of the markings will be poor. It cannot be put to practical use.

A range of 10 to 20 μm is particularly preferred in order to be able to provide glossy markings and to obtain effective air permeability.

Next, the ventilation amount (JIS P8117 Gurley method) is 2 seconds/
If it exceeds 100 cc (in this unit (seconds/100 cc), the smaller the value, the larger the airflow rate, so exceeding means that it is numerically smaller), the surface smoothness of the base material will deteriorate. This will result in poor appearance of the marking, and if it is less than 120 seconds/100 cc (in this case, the numerical value will be large), the air permeability will be poor, which is not preferable.

Considering the strength and ventilation performance of base material 1, 10 seconds/100c
c~50 seconds/100cc is more preferable.

Next, considering the case where the marking 6 is applied to the entire surface of the marking material as shown in Fig. 2, many holes on the surface of the marking material are formed by the marking 6 (ink, clear, etc.), making it difficult to breathe. will be inferior. Therefore, the outgas A generated from the adherend escapes to the outside from the cut end surface of the marking material as well. Therefore, if the thickness of the base material is less than 20 μm, the end cut area of the marking material will be small, resulting in poor air permeability, which is not preferable.

In particular, considering stable air permeability, economic efficiency of the marking material, processability, etc., the thickness of the base material is preferably in the range of 60 μm to 200 μm. The base material of the present invention as described above is
It can be produced by various methods such as sintering method, mixed extraction method, phase separation method, and stretching method, such as water preparation as described in Publication No. 9-5327, etc., and can be produced by various methods such as vinyl chloride, polyethylene, acrylic, urethane,
A versatile thermoplastic material such as Volip-O-pyrene can be used.

Next, the adhesive used in the present invention should be able to obtain adhesive strength between the base material to be laminated and the adherend to which it is attached, and can be processed in any way as long as it has a coating thickness within the commonly used range. Since the adhesive has sufficient air permeability even without the use of adhesives, general-purpose adhesives such as acrylic, rubber, and silicone adhesives can be used.

[Practical example]

The marking material of the present invention will be explained in more detail below with reference to Examples.

Add 20% by weight of ethyl alcohol to vinyl chloride organosol (manufactured by Sumitomo 3M) and add 800 rpl
The mixture was stirred for 15 minutes using a blower mixer, and a continuous porous base material was formed using a casting method and a phase separation method. A marking material was formed by laminating a 30 μm dry thick acrylic adhesive (manufactured by Sumitomo 3M) and a release material on the base material. Screen printing is performed on the entire surface of the base material of the marking material using #3900 series ink manufactured by Sumitomo 3M, and after drying, further ink (G manufactured by Sumitomo 3M) is applied on the surface of the base material.
A-1 clear was applied in the same manner to a dry thickness of about 10 μm, and markings were applied. The following tests were conducted using this marking material.

(a) Blister test ■ Wide-mouth polyethylene pin 5 manufactured by Sanko Plastic Co., Ltd.
00cc is filled with gasoline and sealed, and the above marking material is attached to the surface of the pin.

After being left at 25° C. and 65% RH for one month, the presence or absence of blisters was visually confirmed.

■ Automotive urethane bumper RI within 24 hours after molding
Attach the above marking material to the M molded product (manufactured by Mitsuboshi Belting ■). This was placed in an oven at 80°C for 48 hours, and the presence or absence of blisters was visually confirmed.

Both essays ■ and ■ were evaluated using the following criteria.

O: No blister formation at all;
0-... Occurrence of minute blisters Δ... Occurrence of blisters partially The following evaluation criteria were used.

X: The surface is rough (poor appearance), lacks gloss, and ink does not adhere well.

(C) Surface gloss Marking surface 6 of the same marking material as in (a) above
The gloss level at 0° was measured. (A digital gloss meter VG-2P-D3 manufactured by Nippon Denshoku Industries Co., Ltd. was used.) Evaluation results of Examples and Comparative Examples are shown in Tables 1 to 3 below.

Table 1 shows the base material thickness: 70 μm, airflow rate: 30 seconds/100cc
The evaluation results are shown when the average pore diameter is changed.

Table 2 shows the evaluation results when the ventilation amount was varied with the base material having a thickness of 70 μm and an average pore diameter of 10 μm.

Table 3 shows the evaluation results when the average pore diameter of the base material was changed to 10 μm, 1, air permeation, 11 air flow rate, 30 seconds, and 130 thickness.

The results of both star tests ■ and ■ were ×.

Table 3 Example 2 A polypropylene continuous porous film (manufactured by Sumitomo 3M) was used as a base material, and the surface of the base material was prime treated with chlorinated polypropylene (manufactured by Toyo Kasei Kogyo Co., Ltd.), and the same as in the above example (Example 1) was used. A marking material was formed by laminating an acrylic pressure-sensitive adhesive and a release material on the surface. Furthermore, the above (Example 1,)
The above-mentioned blister test (■ and ■ are described together as one because the results are similar),
The appearance and surface gloss were evaluated. The evaluation results of Examples and Comparative Examples are shown in Tables 4 to 6.

Table 4 shows the thickness of the base material: 80 μm 1 air flow rate: 38 seconds/100CC
The evaluation results are shown when the average pore diameter is changed.

Table 5 shows the evaluation results when the base material thickness was 80 μm, the average pore diameter was 3.2 μm, and the ventilation amount was varied.

Table 6 shows the average pore diameter of the base material: 3.2 μm 1 ventilation 138 seconds/10
The evaluation results are shown when the thickness is changed at 0CC.

Table 64 [Effects of the Invention] As explained above, the base material of the marking material of the present invention is
Average pore size 0.2-50μm 1 ventilation rate 2 seconds/100CC~
Since it is made of a continuous porous plastic film with a speed of 120 seconds/100 cc and a thickness of 2011 m or more, it is possible to provide markings with a good appearance ranging from matte to glossy. Furthermore, even if the entire surface is marked, a marking material with sufficient air permeability can be obtained. Furthermore, since there is no porous layer between the base material and the adhesive layer, it is possible to provide a marking material with high strength that does not cause layer destruction.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing the marking material of the present invention, Fig. 2 is a cross-sectional view of the marking material of the present invention marked and attached to an adherend, and Figs. 3 to 7 are cross-sectional views of the marking material of the present invention. FIG. 2 is a cross-sectional view of a breathable marking material. 1... Base material 2... Adhesive layer 3... Hole 4... Porous layer 5... Adherent 6... Marking

Claims (1)

[Claims] In a marking material formed by laminating an adhesive layer on a base material;
seconds/100cc~120 seconds/100cc, thickness 20μm
A marking material characterized by being formed from the above continuous porous plastic film.