JPH0431396B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to improvements in marking materials for decorative signs used by being attached to outdoor signboards, gasoline tanks for two-wheeled vehicles, vehicle exterior panels, and the like. 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. [Prior Art] 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 chemically provided. Next, the marking material shown in FIG.
However, it is constructed 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, Utility Model Publication No. 59-90980). 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 FIG.
250 μm or more), the strength of the base material was increased, and the structure was designed to contain outgas. [Problems to be Solved by the Invention] However, the marking material shown in FIG. If the pore size is too large, the surface condition will be poor and the gloss will be poor, making it impossible to put it 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. The marking material shown in FIG. 4 is easily damaged because the mechanical strength of the base material is low, 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.
Similar to the marking material shown in the figure, blistering occurs. Furthermore, the marking material shown in FIG.
There is no problem for a short time after adhesion to the adherend, but the longer time passes, the more problems arise as blistering, peeling, etc. occur. SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a marking material that can provide markings with a good appearance and that does not cause problems such as peeling or blistering even when applied to an adherend that generates a large amount of gas. purpose. [Means for Solving the Problems] The marking material of the present invention will be explained with reference to FIG. 1. The base material 1 has an average pore diameter of 0.2 μm to 50 μm, and an air flow rate of 2 seconds/2 seconds/minute as measured by the JIS P8117 Gurley method. 100
It is made of a continuous porous plastic film having a length of cc~120 seconds/100 c.c. and 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 surface of the adhesive layer 2 to facilitate handling of the marking material. The base material used in the marking material of the present invention has an average pore diameter of 0.2 μm to 50 μm, and an air flow rate of 2 seconds/100 c.c.
120 seconds/100c.c. (JIS P8117 Gurley type), thickness 20μm
This is a continuous porous plastic film as described above.
If the average pore diameter is less than 0.2 μm, the marking formed on the marking material will block the pores, resulting in poor air permeability, which is undesirable. If it exceeds 50 μm, the appearance of the marking will be poor, making it unsuitable for practical use. I don't get it. 10~10 to be able to apply glossy markings and to obtain effective ventilation.
A range of 20 μm is particularly preferred. Next, the ventilation (JIS P8117 Gurley type) is set for 2 seconds/
If it exceeds 100c.c. (in this unit (seconds/100c.c.), the smaller the number, the larger the airflow rate, so exceeding means that it is numerically smaller), the surface smoothness of the base material If it is less than 120 seconds/100 c.c. (in this case, the numerical value is large), the air permeability will be poor, which is not preferable. Considering the strength and air permeability of the base material 1, 10 seconds/100 c.c. to 50 seconds/100 c.c. 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, the holes on the surface of the marking material are
(ink, clear, etc.), resulting in poor air permeability. 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, economy of marking materials, processability, etc., the thickness of the base material is
A range of 60 μm to 200 μm is preferred. The base material of the present invention as described above can be manufactured by a sintering method, a mixed extraction method, a phase separation method, and a stretching method, as disclosed in Japanese Patent Publication No. 59-5327, etc.
Versatile thermoplastic materials such as polyethylene, acrylic, urethane, polypropylene, etc. 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. [Example] The marking material of the present invention will be explained in more detail below with reference to Examples. Example 1 Add 20% by weight of ethyl alcohol to vinyl chloride organosol (manufactured by Sumitomo 3M),
The mixture was stirred at 800 rpm for 15 minutes using a propeller 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. Manufactured by Sumitomo 3M Co., Ltd. on the surface of the base material of the marking material
Screen print the entire surface with 3900 series ink, and after drying, add Sumitomo 3M's ink on top of this.
GA-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 A 500 c.c. wide-mouth polyethylene bottle manufactured by Sanko Plastics Co., Ltd. is filled with gasoline, sealed, and the above marking material is affixed to the surface of the bottle. 25℃, 65
After being left at %RH for one month, the presence or absence of blistering was visually confirmed. Automotive urethane bumper within 24 hours after molding
Attach the above marking material to the RIM molded product (manufactured by Mitsuboshi Belting Co., Ltd.). This was placed in an oven at 80°C for 48 hours, and the presence or absence of blisters was visually confirmed. Both tests were evaluated using the following criteria. ◎...No blisters at all ○...Minute blisters occur △...Blisters partially occur ×...Blisters occur on the entire surface (b) Appearance condition Visually check the marking surface of the same marking material as in (a) above The following evaluation criteria were used. ◎…Very shiny. ○…Glossy. △…Matte. (Good appearance) ×...The surface is rough and lacks gloss, and the ink does not adhere well. (Poor appearance) (c) Surface gloss The gloss at 60° of the marking surface of the same marking material as in (a) above was measured. (A digital gloss meter VG-2P-D3 manufactured by Nippon Denshoku Kogyo Co., Ltd. was used.) Below, the evaluation results of Examples and Comparative Examples are shown in Tables 1 to 3.
Shown below. Table 1 shows the evaluation results when the average pore diameter was varied at a base material thickness of 70 μm and an air flow rate of 30 seconds/100 c.c. Table 2 shows the evaluation results when the base material thickness was 70 μm, the average pore diameter was 10 μm, and the ventilation amount was varied. Table 3 shows the average pore diameter of the base material: 10 μm, air flow rate: 30 seconds/100
The evaluation results are shown when the thickness is changed by cc.

[Table] The conventional marking materials shown in FIGS. 3, 5, 6, and 7 above all gave X results in the blister test, and the conventional marking materials shown in FIG. The result was X in terms of appearance.

【table】

[Table] 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 treated with a primer with chlorinated polypropylene (manufactured by Toyo Kasei Kogyo Co., Ltd.), and the same as in the above example (Example 1) was used. Similarly, a marking material was formed by laminating an acrylic adhesive and a release material. Furthermore, markings were applied in the same manner as in the above (Example 1), and the blister test (described as one single product due to similar results), 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 evaluation results when the average pore diameter was varied at a base material thickness of 80 μm and an air flow rate of 38 seconds/100 c.c. Table 5 shows the evaluation results when the base material thickness was 80 μm, the average pore diameter was 3.2 μm, and the air flow rate was varied. Table 6 shows the evaluation results when the average pore diameter of the base material was 3.2 μm, the air flow rate was 38 seconds/100 c.c., and the thickness was varied.

【table】

【table】

〔Effect of the invention〕

As explained above, the base material of the marking material of the present invention has an average pore diameter of 0.2 to 50 μm and an air flow rate of 2 seconds/100 μm.
cc ~ 120 seconds/100 c.c., and is formed from a continuous porous plastic film with a thickness of 20 μm or more, so markings with a good appearance ranging from matte to glossy can be made. Furthermore, even if the entire surface is marked, a marking material with sufficient air permeability can be obtained. Further, 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 applied with markings and attached to an adherend, and Fig. 3 is a cross-sectional view showing the marking material of the present invention.
7 are cross-sectional views showing conventional air permeable marking materials. 1... Base material, 2... Adhesive layer, 3... Hole, 4...
...Porous layer, 5...Adherent, 6...Marking.

Claims (1)

[Claims] 1 In a marking material formed by laminating an adhesive layer on a base material; the base material has an average pore size of 0.2 μm to 50 μm,
A marking material characterized by being formed of a continuous porous plastic film having an air flow rate of 2 seconds/100 c.c. to 120 seconds/100 c.c. and a thickness of 20 μm or more.