JPH05117602A - Laminate - Google Patents

Abstract

PURPOSE:To permit efficient masking and packaging operation because no curling is evolved at the ends even if variations occur in the temperature and the moisture content. CONSTITUTION:A laminate 1 comprising a base material 2 made from a porous planar material, a pressure-sensitive adhesive layer 5 provided on one side of the base material 2 and a release-treatment layer 6 provided on the other side of the base material 2, a laminate layer 3 or 4 being held respectively between the pressure-sensitive adhesive layer 5 or the release treatment layer 6 and the base material 2. The laminate 1 may be a roll-like laminate wound with the release-treatment layer 6 facing outside and the pressure-sensitive adhesive layer 5 facing inside, or a sheet-like laminate with a release paper 7 applied on the pressure-sensitive adhesive layer 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminate, the purpose of which is masking excellent in usability without causing arcuate "curling" in the laminate itself due to changes in temperature and the like. It is intended to provide a laminated body which is widely used for packaging, joining and the like.

[0002]

2. Description of the Related Art Conventionally, as an adhesive tape used for masking, packaging, joining, etc., an adhesive layer is provided on one side of a substrate made of a porous flat body and a release treatment layer is provided on the other side. The resulting laminate was used in a wide variety of fields. In this laminate, as the porous flat body, a material selected from a single material or a composite material such as cloths, papers, and foamed plastic films is used, and the gap between the porous flat body and the release treatment layer is: In order to prevent the components of the release treatment layer from impregnating the porous flat body, a laminate layer called a sealing layer was provided. On the other hand, in the gap between the porous flat body and the pressure-sensitive adhesive layer, since the composition of the pressure-sensitive adhesive layer is made of a polymer material higher than that of the release treatment layer, the components of the pressure-sensitive adhesive layer are impregnated into the porous flat body. It is usually not provided with a laminate layer referred to as a sealing layer because it hardly affects the properties of the laminate even if it is impregnated.

[0003]

However, in the above-mentioned conventional laminated body, since the laminate layer is provided only in the gap between the porous flat body and the release treatment layer, the porous flat body is made of cloth or foam. The so-called "curling", in which the laminate itself becomes arched due to the effect of temperature when formed of plastic films and due to the effect of moisture when the porous flat body is formed of paper. Sometimes occurred. For this reason, in masking or the like, there is a problem that the edge of the laminate may float from the adherend, or may be peeled off from the edge of the laminate even when used in packaging or the like. there were.

[0004]

In the present invention, a substrate made of a porous flat body, a pressure-sensitive adhesive layer provided on one surface of the substrate, and a release treatment layer provided on the other surface of the substrate are provided. By providing a laminate characterized by comprising a laminate layer in the gap between the pressure-sensitive adhesive layer and the release treatment layer, respectively, the above-mentioned conventional problems. Dissolve in a grudge.

[0005]

[Function] Since the laminate layers are provided on both sides of the substrate made of a porous flat body, the difference in thermal expansion between the laminate layers on both sides is eliminated, and "curling" of the laminate due to temperature change does not occur. .. Even if the porous flat body is formed of a material that is stretched by moisture, such as paper, since the laminate layer does not mask the ingress and egress of moisture, "curling" of the laminate due to moisture does not occur.

[0006]

The structure of the laminated body according to the present invention will be described below with reference to the drawings. FIG. 1 shows a laminate according to the present invention.
It is a cross-sectional explanatory view showing an embodiment of (1), in the figure (2) is a substrate, (3) and (4) is a laminate layer, (5) is an adhesive layer,
(6) is a peeling treatment layer.

In the present invention, the porous flat body used as the substrate (2) includes synthetic fibers such as polyester, polypropylene, polyethylene, acrylic and polyurethane, semi-synthetic fibers such as acetate and promix, and recycled fibers such as rayon. Woven or non-woven fabrics composed of single fibers or mixed fibers such as plant natural fibers such as cotton and hemp, papers such as kraft paper, crepe paper, Japanese paper, expanded polyethylene film, expanded polyurethane film Those selected from a simple substance or a composite such as a foamed plastic film are preferably used. The thickness of the base material (2) is not particularly limited, but it is preferably in the range of about 20 to 300 μm for use.

The laminating layers (3) and (4) are preferably ordinary films such as thermoplastic resins such as polyethylene, polypropylene and ethylene vinyl acetate copolymer, polyethylene films, polyester films, films such as aluminum foil. used. Such a laminated layer (3),
(4) is provided on both sides of the substrate (2) by a usual method, for example, a method of laminating after applying an adhesive or a hot melt extrusion laminating method. The thickness of the laminate layers (3) and (4) is not particularly limited, but it is preferable for use to be in the range of about 8 to 40 μm.

In the present invention, the laminate layer (4) provided in the gap between the base material (2) and the release treatment layer (6) and the gap between the base material (2) and the adhesive layer (5) are provided. It is particularly preferable that the laminated layer (3) to be formed is made of the same material, because the effect of preventing “curling” becomes more remarkable.

In the present invention, when the laminate layers (3) and (4) are formed on both sides of the base material (2) at the same time by using a thermoplastic resin by hot melt extrusion, the conventional anchor treatment becomes unnecessary and the manufacturing process becomes It is preferable because it is simplified. Furthermore, it is preferable to spray ozone onto the base material (2) or to use a corona discharge treatment together, because the adhesion between the base material (2) and the laminate layers (3) and (4) is further improved.

The release treatment layer (6) includes a silicone compound, a long-chain alkyl compound, a release agent such as tetrafluoroethylene, a wax such as liquid paraffin, a fatty acid amide such as ethylenebisstearyl amide and oleic acid amide, Known materials such as surfactants such as polyoxyethylene glycol and alkyl ether phosphates are preferably used, and one or more of these materials are dissolved in a suitable solvent for coating, or heat-melting. It is provided by a technique such as coating. Further, this peeling treatment layer (6) is mixed with the constituent materials of the above-mentioned laminating layer (4) to form a laminating layer.
(4) Even if it is provided by two-layer coextrusion lamination together with the material, or after it is applied to another polyethylene thin layer film in advance, the above-mentioned laminate layer (4) dry laminating method (applying adhesive and applying How to match)
And the like, and is not particularly limited.

The pressure-sensitive adhesive layer (5) may be a pressure-sensitive adhesive mainly composed of natural rubber and / or synthetic rubber, a pressure-sensitive adhesive obtained by polymerizing monomers such as polystyrene-polyethylhexyl acrylate, butyl acrylate and acrylic acid. The pressure-sensitive adhesives are preferably used, and these pressure-sensitive adhesives are provided on the surface of the laminate layer (3) by a known method such as coating with a reverse coater, hot melt coating, press molding or the like. The thickness of the pressure-sensitive adhesive layer (5) is not particularly limited, but it is preferable for use to be in the range of about 20 to 200 μm in terms of use.

FIG. 2 is an external view showing a second embodiment of the laminate (1) according to the present invention. In this example,
As shown in the figure, the laminate (1) is a rolled laminate (1) wound with the release treatment layer (6) on the outside and the adhesive layer (5) on the inside. As described above, the roll-shaped laminate (1) facilitates storage and transportation of the laminate (1), and the release treatment layer (6) is placed on the outside and the adhesive layer (5) is placed on the inside. Since it is wound around, it is easy to handle at the time of use, and since the porous flat body is used as the substrate, the required amount can be easily cut by hand and used.

FIG. 3 is a sectional explanatory view showing a third embodiment of the laminate (1) according to the present invention. In the present invention, the laminate (1) may be a sheet-like laminate (1) in which a pressure sensitive adhesive layer (5) is provided with release paper as shown in the figure. Release paper
(7) is not particularly limited, and a type in which a silicone compound is applied to high-quality paper laminated with polyethylene on one side and the like is preferably used.

[0015]

As described above in detail, the present invention is based on a porous flat substrate, a pressure-sensitive adhesive layer provided on one side of the substrate, and a peeling treatment provided on the other side of the substrate. A laminate comprising a layer, wherein the pressure-sensitive adhesive layer and the release-treated layer each have a laminate layer interposed in the gap between the substrate and It has an excellent effect that masking and packaging work can be performed efficiently without the occurrence of so-called "curling", which is a bow on the pressure-sensitive adhesive layer side or the release treatment layer side of the laminate due to changes in body moisture. Play.

[0016]

EXAMPLES The effects of the laminate according to the present invention will be further clarified by the following examples. The present invention is not limited to this embodiment.

Example 1 A polyester fiber composed of 40 denier multifilament was used as a warp, and 10
Using polyester fiber consisting of 0 denier multifilaments as weft, weaving cloth with a density of 75 warps / inch and 45 wefts / inch on a water jet type loom is used as a porous flat substrate. Obtained. This substrate was subjected to corona treatment with a discharge amount of 50 W / m ² / min using a tandem extrusion laminating machine capable of laminating both sides simultaneously, and the melt flow rate was 7.2 g / 10 min and the density was 0.917 g / min on this one side. 30 μm of low density polyethylene of cm ^{3 on} the other side
A laminate layer was provided by melt extrusion with a thickness of 30 μm. A release agent obtained by dissolving a non-silicone back treatment agent consisting of a long-chain alkyl pendant type polymer in toluene at a concentration of 0.5% was applied to one surface of the above-mentioned porous flat substrate and dried. Coat to a weight of 0.1 g / m ² and 100
It was dried at a temperature of ℃ or more. On the other hand, 100 parts by weight of natural rubber, 90 parts by weight of an aliphatic tackifying resin having a softening point of 85 ° C., 20 parts by weight of a terpene liquid resin, 100 parts by weight of calcium carbonate,
2 parts by weight of an anti-aging agent are mixed and kneaded with a pressure kneader to prepare an adhesive, and the adhesive is weighed at 100 g / m ^{2 on} the side of the release agent of the substrate made of the porous flat body. Then, coating was performed using a calendar to obtain a laminate wound into a roll.

(Example 2) A polydimethylsiloxane compound having a molecular weight of about 1000 has a melt flow rate of 9.5 g / 10.
100, low density polyethylene 100 with a density of 0.917 g / cm ³
5 parts by weight with respect to parts by weight were mixed and kneaded with a mixing roll to prepare a composition A. Melt flow rate is 9
g / 10 min, density 0.926 g / cm ³ , thermoplastic resin B that can be heat-sealed to paper, and melt flow rate 9.5 g
A low density polyethylene C having a density of 0.926 g / cm ³ for 10 minutes was prepared. Using a two-layer coextrusion laminating machine, weighs 73
Thermoplastic resin B and composition A are laminated on one side of a g / cm ² kraft paper kraft paper with a thickness of 10 μm each, and low density polyethylene C on the other side of the kraft paper.
Was laminated to a thickness of 20 μm to prepare a base material. On the other hand, 100 parts by weight of a polystyrene-polyisoprene-polystyrene block copolymer was mixed with 100 parts by weight of a petroleum-based tackifying resin, 20 parts by weight of a liquid softening agent, and 1 part by weight of an anti-aging agent to prepare an adhesive. A low-density polyethylene C layer of the base material was melt-extruded to a thickness of 30 μm, and a separator was attached to the adhesive layer to obtain a sheet-shaped laminate.

(Comparative Example 1) A laminated body wound in a roll shape was obtained in the same manner as in Example 1 except that a low-density polyethylene layer having a thickness of 30 µm was provided on only one surface of the substrate.

(Comparative Example 2) Low density polyethylene C is used as a base material.
A sheet-like laminate was obtained in the same manner as in Example 2 except that no layer was provided.

(Test Example) The laminates obtained in Examples 1 and 2 and Comparative Examples 1 and 2 were cut into a size of 30 cm × 30 cm and tested (in Example 2 and Comparative Example 2, the separator was peeled off). I participated in the test). The curled state of the laminate was measured by leaving the pressure-sensitive adhesive layer of the obtained laminate on the upper surface under a temperature condition of 40 ° C. for 10 hours. The measuring method is shown in Table 1 and the result is shown in Table 2.

[0022]

[Table 1]

[0023]

[Table 2]

[Brief description of drawings]

FIG. 1 is a sectional explanatory view showing an embodiment of a laminated body according to the present invention.

FIG. 2 is an external view showing the second embodiment of the same.

FIG. 3 is an explanatory sectional view showing a third embodiment of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated body 2 Base material 3, 4 Lamination layer 5 Adhesive layer 6 Release treatment layer 7 Release paper

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location C09J 7/02 JKQ 6770-4J JKY 6770-4J

Claims (3)

[Claims] 1. A laminate comprising a substrate composed of a porous flat body, a pressure-sensitive adhesive layer provided on one surface of the substrate, and a release treatment layer provided on the other surface of the substrate. A laminated body characterized in that the pressure-sensitive adhesive layer and the release-treated layer each have a laminate layer interposed in a gap between the substrate and the substrate. 2. The laminated body according to claim 1, wherein the laminated body is a roll-shaped laminated body formed by winding the release treatment layer on the outside and the adhesive layer on the inside. 3. The laminated body is a sheet-shaped laminated body having a pressure-sensitive adhesive layer provided with release paper.
The laminated body according to.