JP4156530B2 - Decorative sheet with adhesive - Google Patents

Description

  The present invention relates to a flexible synthetic resin decorative sheet used for interior decoration of shops, offices, etc. and decoration of furniture, and relates to a decorative sheet with an adhesive.

  This type of decorative sheet with pressure-sensitive adhesive has a laminated structure of a decorative sheet body made of synthetic resin, a pressure-sensitive adhesive layer on the back surface thereof, and a release sheet on the back surface thereof. When peeling off the release sheet from this adhesive-coated decorative sheet and sticking it on the adherend to be used for decorating stores, offices, etc. It is. If even a small amount of air remains between the decorative sheet and the adherend, the air swells in the form of bubbles due to high temperature and high humidity, so that the appearance is poor and the adhesive strength also decreases. In order to make it stick without leaving air, it depends not only on craftsmanship but also on the improvement of the sheet itself.

For example, as shown in Patent Document 1 below, a release sheet is made of a synthetic resin film in which continuous convex ridges having a height of several μm (approximately 1 to 5 μm) are formed. is there. The ridges are arranged in a certain pattern with parallel straight lines, curved lines, and grid-like crossing straight lines.
According to the configuration of Patent Document 1, in the state in which the release sheet is peeled off, the surface of the pressure-sensitive adhesive layer is formed with a line-shaped concave portion, which is the transfer shape of the above-mentioned convex stripes, in parallel and densely. With the adhesive in contact, the recess creates an air escape path, thereby preventing the formation of an air pocket.

As another improvement technique, as shown in Patent Document 2 below, a large number of small recesses are arranged in a dotted pattern on the release sheet, and the release sheet is peeled off in this manner, and the height of the adhesive layer surface is increased. There are some in which a large number of small convex portions having a size of 3 to 50 μm are formed so as to protrude relatively densely.
In this patent document 2, in the initial stage of bonding, the tip of the small convex portion of the pressure-sensitive adhesive layer is first bonded to the surface to be bonded to fix the sheet, and then the sheet is squeezed to defoam the entire surface. It is to be glued.
Japanese Patent Application Publication No. 59-78285 Utility Model Registration No. 2503717

  In the technique described in Patent Document 1, a line pattern of a certain pattern remains in the pressure-sensitive adhesive layer even after being in close contact with the adherend surface, and this pattern of line emphasizes the certain pattern when viewed from the outside. In the case of a transparent sheet, it causes a decrease in appearance.

  In the technique described in Patent Document 2, at the stage where the pressure-sensitive adhesive layer of the decorative sheet is positioned on the surface to be bonded, only the tip of the small convex portion is bonded, so the initial adhesive force is weak, and in this state the decorative sheet is When trying to adhere tightly, misalignment and wrinkles approached, and handling was poor.

  The present invention solves the above-described problems, and an object of the present invention is to provide a synthetic resin decorative sheet with a pressure-sensitive adhesive that has high initial adhesive strength and does not generate interference fringes due to embossing.

  To achieve the above object, a pressure-sensitive adhesive decorative sheet 10 according to the present invention is a synthetic resin decorative sheet that is thin and flexible, as shown in the embodiment of the figure. It is a laminated structure of the adhesive layer 2 on the back surface and the release sheet 3 on the back surface, and the adhesive layer bonding surface of the release sheet 3 is randomly arranged in a polygonal shape so that adjacent linear shapes do not become parallel. In the formed pattern, protruding ridges 3a that are linear in the surface direction are formed so as to protrude, and on the back surface of the pressure-sensitive adhesive layer 2 in a state where the release sheet 3 is peeled off, the ridges 3a are randomly arranged corresponding to the ridges 3a. The air vent groove 2b that is linearly continuous in a pattern is formed.

  On the pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer 2, a contour line continuously surrounds the periphery of the flat portion 2 a formed in a substantially polygonal shape and is adjacent to the back surface side and the end surface side of the decorative sheet 10. An opening air vent groove 2b is formed. The polygonal shape is preferably 4 to 10 square. The flat surface portion 2a may be formed by a curve whose corner is curved in a round shape.

The air vent groove 2b is a linear continuous random in the plane direction, the groove width of 3 0Myuemu～300myuemu, preferably 5 0～200Myuemu, depth 3 ～25Myuemu, is preferably 5 ～20Myuemu It is characterized by that.

In the present invention, the average area of the flat portion 2a surrounded by the air bleeding groove 2b is 0 . 5~3.5mm ^2, preferably 1 to 3 mm ^2, it is desirable that the ratio of the air vent groove pair flat portion is 1 / 3-1 / 7.

  Therefore, in the present invention, a linear pattern of linear traces remains in the pressure-sensitive adhesive layer after being attached to the adherend. And since the area of a plane part is comparatively large and it is set as the flat surface, initial adhesive force is high and there are no malfunctions, such as a shift | offset | difference.

  Moreover, in forming a random pattern on the surface of the pressure-sensitive adhesive layer, it is only necessary to use ridges formed on the release sheet, and therefore it can be easily formed by a method such as embossing.

  In particular, when the groove width, the groove depth, the average area of the flat portion, and the ratio of the groove to the flat portion are within the numerical range, the above effects can be sufficiently exhibited.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a decorative sheet with an adhesive according to the present invention, FIG. 2 is a partially enlarged partial sectional perspective view of the same, and FIG. 3 is a partially enlarged plan view showing an adhesive surface shape of the adhesive layer.

In FIG. 1, 10 is a decorative sheet, 1 is a decorative sheet main body, 2 is an adhesive layer applied to the entire back surface of the decorative sheet main body, and 3 is a release sheet adhered to the back surface of the adhesive layer 3.
The decorative sheet 10 is a thin and flexible synthetic resin decorative sheet having a thickness of 1 mm or less (preferably, 0.25 mm to 0.50 mm) as a whole. The decorative sheet body 1 is made of a flexible synthetic resin sheet such as vinyl chloride, polyester, or polypropylene, and a transparent, colored transparent, translucent or opaque sheet having a thickness of about 0.1 to 0.3 mm is used. The decorative sheet body 1 may have a laminated structure, and an uneven pattern such as embossing or a printed pattern may be formed on the surface or inside thereof.

  The pressure-sensitive adhesive layer 2 is made of, for example, an acrylic adhesive, and is formed on the back surface of the decorative sheet body 1 with a thickness of approximately 30 to 80 μm, preferably 35 to 70 μm.

The release sheet 3 is made of paper having a release surface treated with silicon or the like, or a plastic film such as polyethylene, polyester, or polypropylene, but is preferably about 100 to 160 μm. The release sheet 3 is randomly polygonal (4 to octagonal in the figure) by embossing rollers or the like (the shape or area of adjacent squares is different, and the direction of the outline is zigzag and not linear) Convex ridges 3a that are linearly arranged in an arrayed pattern are formed to protrude, and the protruding surface of the ridge 3a is pressure-bonded toward the pressure-sensitive adhesive layer 2 side. The polygon may have a curved shape with a rounded corner.
Therefore, in the state where the release sheet 3 is peeled off, as shown in FIG. 3, the surface of the pressure-sensitive adhesive layer 2 has the above-mentioned polygon (4 to octagonal in the figure) or curved outer shape due to the transfer of the ridges 3a. The shape surrounded by the air vent groove 2b that continues to the periphery is formed adjacent to the periphery of the flat portion 2a.

It is desirable that the air vent groove 2b has a groove width of about 50 to 200 μm and a groove depth of about 5 to 20 μm.
The reason for this is that if the numerical value is lower than the above value, the air bleeding property is lowered, and bubbles are likely to remain. On the contrary, if the value exceeds the above numerical value, the line mark is visually recognized from the outside after being bonded to the adherend, and the appearance is reduced.

Further, it is desirable that the average area of the plane portion 2a is about 1 to 3 mm ² and the area ratio of the air bleeding groove 2b to the plane portion 2a is about 1/3 to 1/7.
This is because when the average area is less than the above numerical value, the initial adhesiveness is lowered, and when the average area is more than the above numerical value, the air bleeding property is lowered and bubbles are likely to remain. The same is true for the area ratio.
Next, effects of the present invention will be described with reference to examples.

When the decorative sheet with the adhesive coated with the acrylic adhesives of Examples 1 to 4 and Comparative Examples 1 to 4 is prepared according to the numerical values shown in Table 1 below, and this is attached to the mirror plate (acrylic board) The air bleedability, surface appearance, and adhesion were measured.
Specifically, the sample was cut into 25 mm × 200 mm, and was pressed once on the adherend (acrylic plate) with two rubber rollers, and the measurement was made 48 hours later.
As for the surface printability, the surface of the laminated decorative sheet was visually observed.
The measurement conditions for the adhesive force were JIS Z 0237 and were 23 ° C., 180 ° peeling, and a peeling speed of 300 mm / min.

以上の表１に示すように、比較例４をのぞいて実施例、比較例ともエア抜け性は良好○であった。
初期接触面積の極端に小さい比較例１の場合には、表写りは良好○となるが、接着力が極端に低く、また規則的溝間隔とした比較例２，３の場合には、平面部が大きく規則的であるので粘着剤の凹凸が強調され表写り性が低下×していた。
これに対し、実施例１〜４の場合には、表写りは良好○か、ほぼ良好△であり、特に実施例１，２が良好な結果○を示し、総合性能では実施例２が最も良好であった。
なお、接着力に関しては１５Ｎ／２５mm以上（好ましくは２０Ｎ／２５mm以上）あれば問題無しと判定され、実施例１〜４とも、その数値以上となっている。

As shown in Table 1 above, the air release properties were good in all the Examples and Comparative Examples except for Comparative Example 4.
In the case of Comparative Example 1 having an extremely small initial contact area, the appearance is good, but in the case of Comparative Examples 2 and 3 in which the adhesive force is extremely low and the regular groove interval is used, the flat portion Is large and regular, the unevenness of the pressure-sensitive adhesive is emphasized, and the appearance is lowered.
On the other hand, in the case of Examples 1 to 4, the surface appearance is good or almost good Δ, especially Examples 1 and 2 show a good result ○, and in terms of overall performance, Example 2 is the best. Met.
In addition, regarding adhesive force, if it is 15N / 25mm or more (preferably 20N / 25mm or more), it will be determined that there is no problem, and Examples 1-4 are more than the numerical value.

It is sectional drawing of the adhesive sheet with an adhesive which concerns on this invention. It is a partial expansion partial cross-section perspective view of the decorative sheet with an adhesive according to the present invention. It is a partial enlarged plan view which shows the adhesion surface shape of the adhesive.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Decorative sheet 1 Decorative sheet body 2 Adhesive layer 2a Plane portion 2b Air vent groove 3 Release sheet 3a Projection

Claims (3)

In a decorative sheet with an adhesive that has a laminated structure of a synthetic resin decorative sheet body, an adhesive layer, and a release sheet, the adhesive layer bonding surface of the release sheet has a pattern in which a number of substantially polygonal shapes are randomly arranged Convex ridges that are linearly protruded are formed on the back surface of the pressure-sensitive adhesive layer in a state where the release sheet is peeled off, and linearly continues in the surface direction in a pattern that is randomly arranged corresponding to the ridges. Air vent groove is formed,
The air vent groove has a groove width of 30 to 300 μm, a depth of 3 to 25 μm, and an average area of a plane portion surrounded by the air vent groove is 0 . A decorative sheet with an adhesive, having an area ratio of 5 to 3.5 mm ² and an air bleeding groove to a plane portion of 1/3 to 1/7.   The pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer is formed with an air vent groove that is continuous in the surface direction surrounding the periphery of a flat surface formed with a substantially polygonal outer shape and a large number of substantially polygonal shapes adjacent to each other. The decorative sheet with an adhesive according to claim 1, wherein   The decorative sheet with pressure-sensitive adhesive according to claim 1 or 2, wherein the polygonal shape is formed from a quadrangle or a decagon.

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