JPH0971755A - Foam-laminated marking film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a marking film which is easily stuck to an uneven rough surface such as of concrete or mortar, is excellent in shape-following properties, has an improved adhesive strength, and is free from lifting or peeling after being kept stuck for a long term, from the surface stain due to a bleeding substance of a self-adhesive, and from the squeeze-out of the self-adhesive. SOLUTION: This film comprises a foam sheet, a synthetic resin layer bonded to one side of the sheet with an adhesive layer, a self-adhesive layer formed on the other side of the sheet, and a release paper stuck to the self-adhesive layer, subject to the condition that the sheet has closed cells which have ellipsoidal sections extending parallelly to the longitudinal direction of the sheet and have an aspect ratio of 1.2 or higher.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a marking film which can be applied to an adherend containing an alkaline component such as concrete, mortar board, and slate board, or even an adherend with severe irregularities.

[0002]

2. Description of the Related Art Up to now, a marking film has been used as a "paint to be stuck", which is also known as a CI for a company. However, marking films generally have a thickness of the adhesive layer of 30
Since it is on the order of μm, it cannot be attached unless the adherend is a smooth surface, and sufficient adhesiveness cannot be obtained for adherends such as concrete materials from which alkaline components, moisture, etc. spring out from the base There was such a problem. When attaching a marking film to such an uneven surface and concrete material, it was common to apply an acrylic or acrylic-urethane type primer to the adherend surface and then apply the marking film and then apply the marking film. .

However, in performing the surface treatment of the adherend,
It takes a lot of time and cost to apply marking film, such as it takes time to dry after primer coating, and a curing sheet is required to prevent dust and dirt from adhering to the coating surface during drying. Met.

Japanese Unexamined Patent Publication (Kokai) No. 6-279738 discloses an undercoating method for applying a marking film to an aluminum film, a butyl rubber adhesive for rough surfaces such as concrete and mortar, and a nonwoven fabric or foam as a support. There has been proposed a method of attaching an adhesive film for base treatment, which is composed of a double-sided tape or the like using a sheet. However, since the aluminum film follows the rough surface of concrete and a smooth surface cannot be obtained, even if a marking film is stuck on the surface, the surface may not be flat and the appearance may be impaired. Further, when it is used for a long period of time, there is a problem that the aluminum film is corroded and deteriorated by an alkaline component and water generated from a rough surface of concrete, an acidic component contained in exhaust gas of automobiles and the like. Furthermore, the construction is complicated and time-consuming, and the adhesive that can be used is limited to butyl rubber only, and the adhesive layer is thick at 300 to 500 μm, so that the adhesive sticks out especially from the edge portion and sticks to the sticking out adhesive. There is a problem in that the appearance of oil is significantly impaired due to the adhesion of oil and dust.

[0005]

The problem to be solved by the present invention is also applied to adherends such as uneven surfaces, concrete and mortar boards, and slate boards from which alkaline components, water and the like are released. It is an object of the present invention to provide a marking film which has sufficient adhesiveness, does not require treatment such as a primer and a sealer, and is easy to apply.

[0006]

The foam laminated marking film of the present invention is for solving the above-mentioned problems, and the foam sheet (a) and the synthetic resin layer (b) are adhesive layers (d). It is characterized in that it has a pressure-sensitive adhesive layer (c) on the opposite side of the foam sheet (a) and is laminated with release paper. Foam laminated marking film in the present invention, the flexibility of the foam, shape conformability, particularly uneven surface, concrete or mortar board, by slate plate alkali components and water, by bubbling, It can be applied to adherends to which marking films are not said to adhere.

The foam sheet (a) used in the present invention is not particularly limited in material, but the foam structure of the core has an average length in the major axis direction elongated in the length direction of the core. Is 10 μm to 200 μm or less and the average length in the minor axis direction is 8.3 μm to 166.7 μm or less, and the closed cell structure has an elliptical cross section, and the ratio of the average length of the major axis to the minor axis is .2 or more) is preferable. The ratio is 1.2
When it is less than the above range, flexibility in the thickness direction is not obtained, and the shape followability with respect to the unevenness of the surface of concrete or mortar is reduced, and the adhesive area and adhesive strength are reduced.

Further, the expansion ratio of the foam sheet used in the present invention is preferably 5 to 15 times, more preferably 8 to 13 times. If it is less than 5 times, sufficient flexibility cannot be obtained, and if it exceeds 15 times, strength at break of foam,
The interlaminar strength is also reduced, which leads to a decrease in the workability of attachment and a breakage of the interlaminar layer after adhesion and fixation. The cell structure may be mixed with spherical closed cells or open cells.

The foam sheet used in the present invention has a thickness
0.1 mm or more and 3.0 mm or less, preferably 0.2 mm
Above 1.5 mm, strength at break is 1 Kgf / cm² Less than
Upper 100 kgf / cm² Below, preferably, 10 Kgf
/ Cm² 50kgf / cm or more ² Below, the elongation at cutting
100% or more and 500% or less, preferably 200% or more 4
It is less than 00%.

The foam sheet used in the present invention preferably has properties such as cold resistance, water resistance, alkali resistance, oil resistance, weather resistance and impact resistance. Specific examples of the foam sheet having such characteristics include rubber foam sheets made of polyethylene, polypropylene, ethylene-propylene copolymer, acrylic rubber, polyurethane, and other elastomers.

Such a foam sheet is obtained by, for example, irradiating a polyethylene containing a chemical foaming material with an electron beam and crosslinking the sheet to continuously heat it into a highly foamed sheet, and then slicing the foamed body in the thickness direction. It is obtained by stretching the obtained sheet in the lengthwise direction with a heating roll to form a surface film. Toray Pef 10010- manufactured by Toray Industries, Inc. is commercially available.
NM00 (foaming ratio 10 times, thickness 1.0 mm), Toray Pef 10008-NM00 (foaming ratio 10 times, thickness 0.
8 mm), Torre Pef 07008-NM00 (expansion ratio 7 times, thickness 0.8 mm) and the like, but are not particularly limited thereto.

The synthetic resin layer (b) used in the present invention is not particularly limited in its material, but in general, as a material satisfying the characteristics of the marking film, the thickness is 30 μm or more and 500 μm or less, preferably 50 μm or more and 300 μm.
Hereafter, it is particularly preferably 80 μm or more and 200 μm or less, and examples thereof include polyvinyl chloride-based, polyurethane-based, fluorine-based, and polyester-based resin films. Especially from the viewpoint of durability and cost, it is possible to use a conventionally known additive for polyvinyl chloride resin, that is, a polyvinyl chloride resin film in which a plasticizer, an ultraviolet absorber, a metal soap, a pigment, and other various stabilizers are appropriately mixed. preferable.

The pressure-sensitive adhesive layer (c) used in the present invention is not particularly limited in material, and a generally known rubber-based or (meth) acrylic-based pressure-sensitive adhesive can be used, and durability and weather resistance can be improved. From the viewpoint, an acrylic adhesive is preferable. Further, various tackifiers may be added to the pressure-sensitive adhesive.

The adhesive layer (d) used in the present invention is not particularly limited in material, and generally known adhesives can be used. Further, the same rubber-based or (meth) acrylic pressure-sensitive adhesive as the pressure-sensitive adhesive used in the pressure-sensitive adhesive layer (c) can be used.

The method for producing the marking film according to the present invention is not particularly limited as long as it has the structure described in claim 1, but as a means for adhering the foam sheet and the synthetic resin layer, the foam sheet It is also possible to apply a pressure-sensitive adhesive or an adhesive to the surface to be bonded with the synthetic resin, and then bond the synthetic resin layer with a machine such as a laminator, or to apply the pressure-sensitive adhesive or adhesive to the synthetic resin layer side to foam. It may be attached to the body sheet. If the foam sheet and the synthetic resin used for the synthetic resin layer have a good compatibility, they can be heat-sealed with a heating press machine, a heating roll or the like.

Further, after first providing the pressure-sensitive adhesive layer (c) and the release layer on one surface of the foam sheet, the pressure-sensitive adhesive layer (c) or the adhesive layer (d) is further applied on the other surface. A method of laminating with a synthetic resin layer, or a method of laminating a pressure-sensitive adhesive or an adhesive layer on the synthetic resin layer and laminating with a foam sheet may be used.

As a foam sheet having a pressure-sensitive adhesive layer (c) in advance, it is preferable that a release paper having a release treatment on at least one side thereof is in the form of a bonding tape or a sheet before being bonded to the synthetic resin layer. Examples of the release paper include paper having a release treatment on at least one surface, a plastic film, and the like. However, when the release paper originally has a low energy surface, the release treatment may not be performed.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The foam laminated marking film of the present invention is obtained as follows. That is, first, an acrylic pressure-sensitive adhesive is applied to both sides of a foam sheet having closed cells, which is made of a material such as polyethylene or polypropylene, and release paper having release treatment on both sides is attached to one side thereof and wound into a roll. While sending out the rolled-up sheet, a polyvinyl chloride-based adhesive is applied to the adhesive side by a laminator.
The foam laminated marking film of the present invention can be obtained by laminating a polyurethane-based resin film or the like.

When the foam laminated marking film obtained by the present invention is applied to an uneven surface such as a concrete surface or a mortar surface, there is no problem even if an undertreatment is applied in advance with a primer, a sealer or the like. When there is a risk that the surface of concrete or mortar will be weathered for a considerably long period of time after construction and the surface will easily fall off, it is desirable to subject the surface to a primer or sealer beforehand.

In the foam laminated marking film of the present invention, since the foam sheet is provided with closed cells having an elliptical cross section extending parallel to the longitudinal direction of the major axis, the tensile strength of the foam layer can be improved. It does not impair the elongation, exhibits good shape conformability to uneven surfaces such as rough surfaces of concrete and mortar, provides a large bonded area even with a smaller pressure, and flexibility in the thickness direction absorbs and absorbs stress. To reduce the workability and adhesion strength to the concrete mortar surface to the concrete rough surface to reduce the conventionally known butyl rubber-based pressure-sensitive adhesive is not particularly limited Also, good adhesion can be maintained for a long time.

[0021]

EXAMPLES Examples will be shown below, but the foam laminated marking film of the present invention is not limited thereto.

[Example 1] Thickness 0.8 mm, expansion ratio 7
Double, both sides of a low density polyethylene foam sheet (Toray Pef 07008-NM00 manufactured by Toray Industries, Inc.) with an average major axis distance of the foam cells of 35 μm and an average short axis length of 10 μm were subjected to corona discharge treatment, and the weight average was applied to both sides. Molecular weight 300,
000, the composition of monomers is butyl acrylate, acrylic acid, and hydroxyethyl acrylate is 94.7.
Acrylic adhesive layer (80 μm) consisting of a polymer containing /5/0.3 acrylic acid alkyl ester as a main component and a cross-linking agent is provided, and release paper having release treatment on both sides is attached to one side. It was rolled up once. Next, the sheet wound with a laminator was sent out, and an adhesive layer and a polyvinyl chloride resin film having a thickness of 80 μm (manufactured by Dainippon Ink and Chemicals, Inc.) were laminated to obtain a foam laminated marking film.

[Embodiment 2] Thickness 0.8 mm, expansion ratio 1
0 times, except that a low-density polyethylene foam sheet (Toray Pef 10008-NM00 manufactured by Toray Industries, Inc.) having corona discharge treatment on both sides was used, in which the average major axis distance of the foam cells was 35 μm and the average minor axis length was 10 μm. Was laminated in the same manner as in Example 1 to obtain a foam laminated marking film.

[Example 3] Thickness 0.4 mm, expansion ratio 1
0 times, except that a low-density polyethylene foam sheet (Toray Pef 10004-NM00 manufactured by Toray Industries, Inc.) with both sides having a long major axis distance of 35 μm and an average short axis length of 10 μm subjected to corona discharge treatment was used. Was laminated in the same manner as in Example 1 to obtain a foam laminated marking film.

[Example 4] A marking film (Daitak M-1010-80, manufactured by Dainippon Ink and Chemicals, Inc.) was applied to the non-adhesive processed surface of the same foam sheet except that only one surface of Example 2 was adhesively processed. Were laminated using a Halder laminator to obtain a foam laminated marking film.

Example 5 The same foam sheet and release paper as in Example 1 except that only one side was subjected to adhesive processing,
On the polyvinyl chloride resin side of the polyvinyl chloride resin film (manufactured by Dainippon Ink and Chemicals, Inc.) having a thickness of 80 μm (non-adhesive processed product of the marking film used in Example 4), an adhesive for dry laminating (Dainippon D-Tight 6920 manufactured by Ink Kagaku Kogyo Co., Ltd., to which a cross-linking agent was added and stirred well, was applied so that the coating amount after drying would be 10 μm, dried in a dryer at 80 ° C. for 2 minutes, and then laminated with a Halder laminator to foam. A body laminated marking film was obtained.

Example 6 Thickness 2.0 mm, foaming ratio 8
2 times, except that a low density polyethylene foam sheet (Toray Pef 08020-AM00 manufactured by Toray Industries, Inc.) having an average major axis distance of the foam cell of 35 μm and an average minor axis length of 10 μm and having both surfaces subjected to corona discharge treatment was used. Then, they were laminated in the same manner as in Example 1 to obtain a foam laminated marking film.

[Embodiment 7] Thickness 3.0 mm, expansion ratio 8
Double, except that the low-density polyethylene foam sheet (Toray Pef 13030-AM00 manufactured by Toray Industries, Inc.) having an average major axis distance of the foam cells of 35 μm and an average minor axis length of 10 μm, which had been corona-discharge treated, was used. Then, they were laminated in the same manner as in Example 1 to obtain a foam laminated marking film.

[Embodiment 8] The foamed sheet (Toray Pef 10008-NM00) used in Embodiment 2 was subjected to double-sided corona treatment, and a marking film (M-1010-80 manufactured by Dainippon Ink and Chemicals, Inc.) was used as a laminator. Then, the same pressure-sensitive adhesive as that used in Example 1 was applied to the opposite surface side, and release paper was stuck thereto to obtain a foam laminated marking film.

[Comparative Example 1] Thickness 0.8 mm, expansion ratio 7
Times, the average diameter of the foam cell (spherical shape) is 27μ
m, a foam laminated marking film was obtained by laminating in the same manner as in Example 1 except that a low density polyethylene foam sheet (Vollara IF08008 manufactured by Sekisui Chemical Co., Ltd.) having both surfaces subjected to corona discharge treatment was used.

[Comparative Example 2] Thickness 1.2 mm, expansion ratio 1
0 times the average diameter of the foam cell (spherical shape) is 27μ
m, a low-density polyethylene foam sheet (Polara IF08012 manufactured by Sekisui Chemical Co., Ltd.) was laminated in the same manner as in Example 1 except that corona discharge treatment was used to obtain a foam laminated marking film.

Comparative Example 3 Thickness 1.0 mm Foaming ratio 10
Example 1 except that a rubber foam sheet (Calsoft RPCC10C1 mm manufactured by Takiron Co., Ltd.) was used.
Lamination was carried out in the same manner as above to obtain a foam laminated marking film.

Comparative Example 4 1.0 mm thick foaming ratio 2.
A laminated foam marking film was obtained by laminating in the same manner as in Example 1 except that a 4 times polyurethane foam sheet (C light N381C manufactured by Toyo Quality One Co., Ltd.) was used.

Comparative Example 5 A polyvinyl chloride resin sheet (1010-80 sheet manufactured by Dainippon Ink and Chemicals, Inc., thickness 80 μm) was coated with the same pressure-sensitive adhesive layer (thickness 80 μm) as used in Example 1. The release paper provided was attached to obtain a marking film.

The following performance tests were conducted on the foam laminated marking films obtained in Examples 1 to 8 and Comparative Examples 1 to 5. The results are shown in Table 1, Table 2, Table 3 and Table 4.

[Shape conformability] A polyvinyl chloride resin layer side of a foam laminated marking film having a length of 180 mm and a width of 25 mm is coated on a 3.0 mm thick acrylic plate with a double-sided tape (# 810HD manufactured by Dainippon Ink and Chemicals, Inc.). Laminating: After removing the release paper attached to the foam laminated marking film, a thickness of 3.0 having irregularities of 100 μm at 20 mm intervals
One-way crimping of a 5.0 mm acrylic plate with a 5.0 kg roller, 3
After 0 days, the retention rate of the adhesion area of the acrylic plate to the uneven portion was measured.

[Normal Adhesion Strength] A foam laminated marking film was used as a test piece having a width of 25 mm and a length of 100 mm, and after removing the release paper, it was attached to a mortar board (10 mm in thickness manufactured by Japan Test Panel Co., Ltd.) 2.0 kg. 1 back and forth crimping, 2
After standing for 1 hour and 48 hours in an environment of 3 ° C. and relative humidity of 65% RH, one end of the test piece is 300 mm / mi
n. The peel resistance when peeled in the direction of 180 ° was measured at the speed of.

[Adhesive strength after water resistance test] After attaching the test piece, the test piece is placed under an environment of 23 ° C. and a relative humidity of 65% RH for 1 hour, immersed in water at 40 ° C. for 72 hours, and then for another 24 hours.
The peeling resistance was measured by the same method as the normal state adhesive force except that it was placed in an environment of ℃ and relative humidity of 65% RH.

[25% Compressive Load Test] A test piece having a length of 50
mm, width 50 mm, and thickness 25 mm, and a plate larger than the test piece is sandwiched between the upper and lower sides of the thickness of 2
It was compressed by 5% and stopped, and the load after 20 seconds was measured.

[0040]

[Table 1]

[0041]

[Table 2]

[0042]

[Table 3]

[0043]

[Table 4]

[0044]

EFFECTS OF THE INVENTION According to the present invention, since it has the constitution as described above, it can be easily attached to a rough surface having irregularities such as concrete and mortar, and is excellent in shape followability. Thus, it is possible to provide a marking film that does not float or peel off after being applied for a long period of time, has improved adhesive strength, and does not stain the film surface due to the bleeding material of the pressure-sensitive adhesive or squeeze out of the pressure-sensitive adhesive.

Claims (8)

[Claims] 1. A release paper having a synthetic resin layer (b) laminated on one side of a foam sheet (a) with an adhesive layer (d) and an adhesive layer (c) on the opposite side. In a foam laminated marking film obtained by laminating, the foam sheet has closed cells having an elliptical cross section extending parallel to the lengthwise direction, and the closed cells have a long axis length and a short axis length. A foam laminated marking film having a ratio (long axis length / short axis length) of 1.2 or more. 2. The foam sheet (a) has a thickness of 0.1 m.
The foam laminated marking film according to claim 1, wherein the foam laminated marking film has a thickness of not less than m and not more than 3.0 mm. 3. The strength at break of the foam sheet (a) is 1
The foam laminated marking film according to claim 1, which has a Kgf / cm ² or more and 100 Kgf / cm ² or less. 4. The foam laminated marking film according to claim 1, wherein the foam sheet (a) has an elongation at break of 100% or more and 500% or less. 5. The foam laminated marking film according to claim 1, wherein the foam laminated marking film has a shape following property of 80% or more and 100% or less. 6. The foam laminated marking film according to claim 1, wherein the 25% compression load value of the foam sheet (a) is 0.1 Kgf / cm ² or more and 0.9 Kgf / cm ² or less. 7. The pressure-sensitive adhesive layer (c) is 30 μm or more and 500.
The foam laminated marking film according to claim 1, which has a thickness of not more than μm. 8. The laminate of the foam layer (a) and the synthetic resin layer (b) by the adhesive layer (d) is a laminate selected from the group consisting of a pressure-sensitive adhesive layer, an adhesive layer and heat fusion. Item 2. A foam laminated marking film according to item 1.