JPH0142117Y2 - - Google Patents

Description

[Detailed description of the invention] Conventionally, pressure-sensitive adhesive labels or sheets have a coating layer of pressure-sensitive adhesive on the back side of a label or sheet base material made of plastic film having weather resistance, water resistance, abrasion resistance, etc. This is used by pasting it on molded products such as plastic automobile parts, electrical equipment, building materials, containers for food and cosmetics, etc., but after being pasted, it bulges as shown in the first figure. The reason for this is that the gas produced during molding contained in the molded product A is gradually released onto the surface of the molded product over time under the environmental temperature, for example at room temperature, but the pressure Base material B1 of adhesive label or sheet B
has little or no property of transmitting the gas, so it can be interpreted that this is pushed up by the gas C accumulated in or under the adhesive coating layer B2, and thus the adhesive coating layer B2 peels off at that part. The good adhesion condition at the initial stage of adhesion is lost.

In order to prevent this blistering phenomenon, for example, it is possible to make the adhesive coating layer itself porous by some means to give it breathability, but this would reduce the adhesive strength of the adhesive coating itself. Undesirable. Furthermore, providing a large number of through holes in the label or sheet base material layer has the disadvantage of reducing the surface smoothness and printability of the label.

The present invention provides a breathable pressure-sensitive adhesive label or sheet that can prevent the above-mentioned blistering phenomenon while maintaining the label or sheet base material and adhesive layer without reducing surface smoothness, printability, and adhesion. A pressure-sensitive adhesive coating layer 3 is provided on the back side of a label or sheet base material 1 made of plastic film through an air-permeable base material 2 having continuous micropores in the surface direction.

Embodiments of the present invention will be described with reference to the accompanying drawings.

In Fig. 2, 1 indicates a plastic film label or sheet base material, which is made of polyester, polypropylene, polyethylene, vinyl chloride, acetate, etc., and has a thickness of 10~
Usually about 500μ. According to the present invention, the back surface has continuous micropores in both directions and has a thickness of 20~20 mm.
A 500μ breathable base material 2 is polymerized and bonded, and this base material 2
A pressure-sensitive adhesive coating layer 3 for pasting is provided through the label to form a breathable pressure-sensitive adhesive label or sheet P. That is, a coating layer 4 of a binder such as acrylic or vinyl acetate is provided on the back side of the plastic film base material 1 to a thickness of about 10 to 50 μm, and the above-mentioned breathable base material 2 is attached to the outer surface of the coating layer 4. On the outer surface of the air-permeable base material 2, a coating layer 3 of a pressure sensitive adhesive such as an acrylic adhesive or a rubber adhesive is preferably provided, generally having a thickness of 10 to 100 microns. Considering its breathability, the coating layer should be up to approximately 200μ thick. 5 shows a silicone release paper temporarily attached to the outer surface of the pressure-sensitive adhesive coating layer 3. A printing surface 6 is usually applied to the surface of the film base material 1. Furthermore, if necessary, a laminate film (not shown) is applied on the printing surface 6 to protect it. The breathable base material 2 interposed according to the present invention is made of paper such as nonwoven fabric, Japanese paper, high-quality paper, cast coated paper, etc., continuous porous synthetic resin material such as polyethylene, polypropylene, styrene, urethane, etc., such as Sekisui Kagaku Kogyo Co., Ltd. A continuous vent hole of 1 μm or less is sufficient, and if the vent hole is too large, it is not preferable because the tensile strength and smoothness will decrease. In order to improve the adhesion with the surface substrate 1 on the upper surface of the breathable substrate 2, it is preferable to use a material having a smooth surface coated with a resin, such as the above-mentioned cast coated paper.

FIG. 3 shows the state in which the label or sheet P of the present invention is used. After the release paper 5 is peeled off, the label or sheet P of the present invention shown in FIG. Paste and use. Thus,
The gas released from inside the molded product A gradually passes through the adhesive layer 3 on its upper surface and rises, but since the upper layer has a continuous microporous base material 2 in the plane direction, the gas emitted from the inside of the molded product A rises as shown by the arrow. As shown in FIG. 2, the gas escapes in the plane direction within the two layers of the breathable base material and is easily released from the edges to the outside, so that no gas is accumulated on the lower surfaces of the upper layers 1 and 4. As a result, on the lower surface of the base material 1, as in the conventional case,
This prevents gas from accumulating and causing the base material 1 to lift and bulge. Therefore, the printing surface 6 on the front surface of the label or sheet P is not distorted due to blistering, and a flat and good display surface is always maintained. In addition, the molded product P has good adhesion on all three surfaces of the pressure-sensitive adhesive coating, and the stable use state of the label or sheet is maintained over a long period of time.

It goes without saying that the present invention can be applied to various kinds of labels or sheets, for example, to those having a metal vapor deposited layer on the bottom surface of the plastic film substrate 1 in advance.

According to the present invention, a breathable base material 2 having continuous fine pores in the surface direction is interposed between a label or sheet base material 1 made of plastic film and a pressure-sensitive adhesive coating layer 3 applied to the back surface thereof. Since the air-permeable pressure-sensitive adhesive label or sheet has such a structure, it has extremely good adhesion to molded products, and gas is easily guided and extracted in the surface direction through the air-permeable base material 2, which prevents blistering caused by gas. It has the effect that a pressure-sensitive adhesive label or sheet can be obtained that can maintain a stable adhesion usage state for a long period of time, and has good surface smoothness of the surface base material 1 and good printability.

[Brief explanation of the drawing]

Figure 1 is a cutaway side view of the conventional product in use, Figure 2
The figure shows a side view of one embodiment of the present invention, and FIG. 3 shows a cutaway side view of the device in use. 1...Plastic film label or sheet base material, 2...Breathable base material, 3...Pressure sensitive adhesive coating layer, 4...Binder.

Claims (1)

[Scope of utility model registration request] A breathable pressure-sensitive adhesive label or sheet comprising a pressure-sensitive adhesive coating layer 3 provided on the back side of a label or sheet base material 1 made of plastic film through a breathable base material 2 having continuous micropores in the surface direction.