JP2002161256A - Adhesive sheet for decoration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive sheet for decoration which is hardly torn at a notched portion when an unnecessary portion is peeled off, has a high tear strength, facilitates to continue an unnecessary portion-removing work because the end portion of the left unnecessary portion is turned up even when the film is torn, and is excellent in application workability. SOLUTION: This adhesive sheet for decoration comprises stable fibers compounded into at least one of the thermoplastic resin film and the adhesive layer. Preferably, the adhesive sheet for decoration comprises staple fibers having a fiber diameter of 3 to 20 μm and a fiber length of 0.3 to 3 mm compounded into the thermoplastic resin film, or staple fibers having a fiber diameter of 3 to 30 μm and a fiber length of 0.3 to 5 mm compounded into the adhesive layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative adhesive sheet used indoors and outdoors.

[0002]

2. Description of the Related Art In many cases, decorative adhesive sheets are cut into shapes that require an original sheet, and unnecessary portions are removed on release paper in many cases. Described). If the strength of the sheet is weak, the sheet will tear at the notch when removing unnecessary parts in this scrap removal work, and it will be necessary to repeat the work of turning the sheet again, Problems such as tearing of the entire sheet to make it unusable are likely to occur. Further, as a construction procedure, an unnecessary portion may be peeled off after the sheet is first attached to the entire adherend. In this case, since the adhesive force between the adherend and the sheet is strong, an unnecessary force is further applied to peel off the unnecessary portion, and the sheet is easily torn. Further, when the hardness of the sheet is temperature-dependent and the sheet is easily torn at a low temperature, it is more difficult to perform a scrap removing operation performed in a place having a low temperature such as outdoors.

As a method of improving these, there is a method of examining the blending of a thermoplastic resin film used for a sheet. However, since the basic properties of the film are determined by the structure of the resin itself, it is greatly improved. It is difficult to change the physical properties, and if the physical properties are largely changed, the influence on the weather resistance and the adhesive physical properties is increased, and it is difficult to find an optimum composition.

[0004] Japanese Patent Application Laid-Open No. 9-94906 discloses an example of improving the strength of a sheet in applications where the appearance of the sheet is important.
Japanese Patent Laid-Open Publication No. HEI 9-214605 proposes a laminate sheet having improved strength using a laminate sheet including one layer of a fibrous substance or a fibrous sheet (for example, a woven or non-woven fabric made of fibers) as a base material. However, in this case, since the fibrous substance or the fibrous sheet has a predetermined thickness, the thickness of the sheet as a whole also increases, and there is a problem that handleability such as curved surface workability deteriorates.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems relating to the conventional decorative adhesive sheet, and an object of the present invention is to provide a sheet having excellent tear strength without changing the thickness of the sheet. In order to provide a decorative adhesive sheet that is easy to use, even if the film is torn, the end of the remaining residue is turned up, so that the film continues to be raised, making it easier to remove the residue. Is to provide.

[0006]

The decorative pressure-sensitive adhesive sheet according to claim 1 is a decorative pressure-sensitive adhesive sheet in which a pressure-sensitive adhesive layer is laminated on a base material layer made of a thermoplastic resin film. It is characterized in that fibers are blended. The decorative adhesive sheet according to claim 2 is claim 1.
The decorative adhesive sheet according to the above, wherein the thermoplastic resin film has a fiber diameter of 3 to 20 μm and a fiber length of 0.3 to 3 mm.
Wherein the short fibers are blended. The decorative pressure-sensitive adhesive sheet according to claim 3 is the decorative pressure-sensitive adhesive sheet according to claim 1, wherein the pressure-sensitive adhesive layer has a fiber diameter of 3 to 30 μm.
Wherein a short fiber having a fiber length of 0.3 to 5 mm is compounded. The decorative pressure-sensitive adhesive sheet according to claim 4, wherein in the decorative pressure-sensitive adhesive sheet obtained by laminating a pressure-sensitive adhesive layer on a substrate layer made of a thermoplastic resin film, at least one of the layers has an aspect ratio of 2 to 25 and a particle diameter of 2 to 25. 0.
It is characterized by being mixed with an inorganic material of 5 to 30 μm.

Hereinafter, the present invention will be described in more detail. The thermoplastic resin film used in the present invention is formed, for example, by blending a short fiber as a main component of the resin, if necessary, and appropriately blending a curing agent, a pigment, a light stabilizer, an ultraviolet absorber, and the like. Examples of the resin main component include polyacrylic, soft vinyl chloride, polyurethane, and polyester. Among them, polyacrylic and soft vinyl chloride are preferred because of their excellent weather resistance.

The thickness of the film is preferably 20 to 120 μm. If it is less than 20 μm, the film becomes too thin, and problems such as poor workability during construction, easy picking up of irregularities on the underlayer, and poor weather resistance are likely to occur. When the thickness exceeds 120 μm, the stiffness of the film comes out, and the workability on the curved surface is deteriorated.

As the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer in the present invention, for example, a pressure-sensitive adhesive in which an optional component such as a curing agent is blended as necessary with a main component of the pressure-sensitive adhesive is used. Examples of the main component of the adhesive include acrylic, rubber, urethane, and silicone. Among them, acrylic ones are preferred in view of physical properties and economy.

The thickness of the pressure-sensitive adhesive layer is preferably from 10 to 50 μm. When the thickness is less than 10 μm, sufficient adhesive strength may not be obtained, and irregularities on the base may be easily picked up. The thickness of the pressure-sensitive adhesive is preferably larger than the fiber diameter and the particle diameter of the inorganic material described later.

As the short fibers that may be blended in the film, for example, polyamide-based, aramid-based, polyester-based, acryl-based, polyolefin-based, and polyvinyl alcohol-based fibers are suitably used.
μm, and the fiber length is preferably 0.3 to 3 mm. When the fiber diameter is less than 3 μm, it becomes difficult to produce short fibers. When the fiber diameter exceeds 30 μm, the tear strength is improved, but the thickness of the fiber when the fibers are overlapped in the film becomes too large, and the appearance of the sheet is deteriorated.

When the fiber length is less than 0.3 mm, it is difficult to stably cut the fiber in the production. 3
If it exceeds mm, the appearance of the product is adversely affected. The blending amount of the short fibers in the thermoplastic resin film is not particularly limited, but is preferably, for example, about 1 to 10 parts by weight based on 100 parts by weight of the main resin component constituting the thermoplastic resin film.

Examples of the short fibers that may be blended with the above adhesive main component include polyamide-based, aramid-based, polyester-based, acrylic-based, polyolefin-based, and polyvinyl alcohol-based fibers, and have a fiber diameter of 3 to 30 μm.
And the fiber length is preferably 0.3 to 5 mm. When the fiber diameter is less than 3 μm, it becomes difficult to produce short fibers. When the fiber diameter exceeds 30 μm, the tear strength is improved, but the thickness of the fibers when they are overlapped in the pressure-sensitive adhesive becomes too large, and the appearance of the sheet is deteriorated.
When the fiber length is less than 0.3 mm, it is difficult to stably cut the fiber in the production. If it exceeds 5 mm, the appearance of the sheet will be poor, and the viscosity of the pressure-sensitive adhesive will be too high, thus lowering the productivity.

[0014] The amount of the short fibers in the pressure-sensitive adhesive is preferably 1 to 15 parts by weight based on 100 parts by weight of the main component of the pressure-sensitive adhesive. When the amount is less than 1 part by weight, the effect of improving the tear strength is not seen, and when the amount exceeds 15 parts by weight, the appearance of the sheet is deteriorated, and the viscosity of the pressure-sensitive adhesive becomes too high, so that the productivity is lowered.

[0015] At least one of the thermoplastic resin film and the pressure-sensitive adhesive has an aspect ratio of 2 to 25.
Inorganic materials having a particle diameter of 0.5 to 30 μm include wollastonite, potassium titanate, magnesium sulfate,
Examples include sepiolite, zonotolite, and aluminum borate. If the aspect ratio or particle size is below the lower limit, the effect of improving the tear strength cannot be obtained, and if these exceed the upper limit, when mixed with the film or adhesive, the inorganic materials overlap and the thickness becomes too large. May adversely affect the appearance of the product.

(Function) In the present invention, at least one of the thermoplastic resin film and the pressure-sensitive adhesive layer contains a short fiber or an inorganic material having an aspect ratio of 2 to 25 and a particle diameter of 0.5 to 30 μm. Thereby, the tear strength of the decorative adhesive sheet is improved. It is presumed that by including these, even if tensile or shearing stress is generated in the sheet, the specific fiber or inorganic material can handle the stress, so that high tear strength can be obtained. Therefore, the tear strength can be improved without changing the thickness of the entire sheet as compared with a decorative adhesive sheet having a configuration not including these.

[0017]

FIG. 1 is a schematic sectional view showing an example of an embodiment of the decorative adhesive sheet of the present invention. The decorative pressure-sensitive adhesive sheet according to the present invention is formed by, for example, laminating a thermoplastic resin film 1 and a pressure-sensitive adhesive layer 2. Release paper 3 may be laminated on the adhesive layer as needed. When the release paper is laminated, the release paper is peeled off before use.

The decorative pressure-sensitive adhesive sheet of the present invention can provide a sheet having excellent tear strength by incorporating short fibers into at least one of the thermoplastic resin film 1 and the pressure-sensitive adhesive layer 2. The method for producing the above-mentioned thermoplastic sheet is not particularly limited. For example, the thermoplastic sheet is suitably produced by a method such as cast molding, extrusion molding, or calendar molding.

Hereinafter, the present invention will be described more specifically with reference to examples. Further, “parts” means “parts by weight”. [Example 1-1] (1) Preparation of thermoplastic resin film Acrylic polyol (Hitaloid 3 manufactured by Hitachi Chemical Co., Ltd.)
046C) and 100 parts of an isocyanate curing agent (Duranate E402 manufactured by Asahi Kasei Kogyo Co., Ltd.) and a pigment (DPP Red B manufactured by Ciba Specialty Chemicals) based on 100 parts.
P) 4 parts, 0.5 parts of a light stabilizer (Tinuvin 622LD manufactured by Ciba Specialty Chemicals), and 3 parts of cut fiber (acrylic fiber T901 manufactured by Nippon Xlan Industrial Co., Ltd. T901: fiber diameter 12 μm, fiber length 1 mm) as short fibers A coating solution was prepared. The obtained coating liquid was applied to PET release paper (HP2 manufactured by Toyo Metallizing Co., Ltd.) and dried to obtain an acrylic film having a thickness of 50 μm.

(2) Preparation of PSA Acrylic PSA (SK1335, manufactured by Soken Chemical Co., Ltd.) 10
0 parts were mixed with 5 parts of a curing agent (M-5A manufactured by Soken Chemical Co., Ltd.), and release paper (SLK10 manufactured by Kite Chemical Industry Co., Ltd.) was used.
0) and dried to obtain an adhesive having a thickness of 30 μm. (3) Preparation of pressure-sensitive adhesive sheet for decoration The obtained pressure-sensitive adhesive was bonded to the acrylic film to obtain a pressure-sensitive adhesive sheet for decoration.

(4) Evaluation The obtained decorative adhesive sheet was evaluated as follows. (Product appearance): Visually evaluated. (Tear load): Trouser tear method (JIS K712)
The tear load was measured according to 8). (Draft character workability): After cutting six characters of 'Sekisui Chemical Co., Ltd.' with a cutting machine at 100 mm × 100 mm, a cutout character work was performed, and the workability was evaluated based on the following criteria. ◎: very good ○: good △: slightly difficult ×: difficult

[Example 1-2] In the preparation of a thermoplastic resin film, cut fibers (acrylic fiber T901 manufactured by Nippon Exlan Industrial Co., Ltd., T901: fiber diameter 12) were used as short fibers.
A pressure-sensitive adhesive sheet for decoration was prepared in the same manner as in Example 1-1, except that 1.5 parts of (μm, fiber length 0.5 mm) was blended, and the same evaluation was performed.

[Example 1-3] In the production of a thermoplastic resin film, 1.5 parts of cut fiber (aramid fiber Conex manufactured by Teijin Limited: fiber diameter 12 µm, fiber length 0.6 mm) was blended as short fiber. Except for Example 1
A decorative adhesive sheet was prepared in the same manner as in Example -1, and the same evaluation was performed.

Comparative Example 1-1 In the preparation of a thermoplastic resin film, a decorative adhesive sheet was prepared in the same manner as in Example 1-1 except that short fibers were not blended, and the same evaluation was performed. Was.

[Comparative Example 1-2] In the production of a thermoplastic resin film, cut fibers (acrylic fiber T901 manufactured by Nippon Exlan Industrial Co., Ltd .: fiber diameter 12) were used as short fibers.
A decorative pressure-sensitive adhesive sheet was prepared in the same manner as in Example 1-1, except that 1.5 parts of (μm, fiber length 5 mm) was blended, and the same evaluation was performed.

Example 2-1 (1) Preparation of thermoplastic resin film Acrylic polyol (Hitaloid 3 manufactured by Hitachi Chemical Co., Ltd.)
046C) and 100 parts of an isocyanate curing agent (Duranate E402 manufactured by Asahi Kasei Kogyo Co., Ltd.) and a pigment (DPP Red B manufactured by Ciba Specialty Chemicals) based on 100 parts.
P) 4 parts and 0.5 part of a light stabilizer (Tinuvin 622LD manufactured by Ciba Specialty Chemicals) were blended to prepare a coating liquid. The obtained coating liquid was applied to PET release paper (HP2, manufactured by Toyo Metallizing Co., Ltd.) and dried to obtain an acrylic film having a thickness of 50 μm.

(2) Preparation of PSA Acrylic PSA (SK1335 manufactured by Soken Chemical Co., Ltd.) 10
For 0 parts, 5 parts of hardener (M-5A manufactured by Soken Chemical Co., Ltd.)
Part, and cut fiber as a short fiber (acrylic fiber T901 manufactured by Nippon Exlan Industrial Co., Ltd .: fiber diameter 12μ)
m, fiber length: 1 mm), 1.5 parts by weight, coated on release paper (SLK100, manufactured by Kite Chemical Industry Co., Ltd.), dried, and dried to a thickness of 3
A 0 μm adhesive was obtained. (3) Preparation of pressure-sensitive adhesive sheet for decoration The obtained pressure-sensitive adhesive was bonded to the acrylic film to obtain a pressure-sensitive adhesive sheet for decoration. (4) Evaluation The obtained decorative adhesive sheet was evaluated in the same manner as in Example 1-1.

[Example 2-2] In the preparation of the pressure-sensitive adhesive,
Cut fiber as short fiber (acrylic fiber T901 manufactured by Nippon Exlan Industrial Co., Ltd .: fiber diameter 12 μm, fiber length 4
mm) A decorative pressure-sensitive adhesive sheet was produced in the same manner as in Example 2-1 except that 1.5 parts by weight was blended, and the same evaluation was performed.

[Example 2-3] In the preparation of the pressure-sensitive adhesive,
Cut fiber as short fiber (Aramid fiber Conex manufactured by Teijin Limited: fiber diameter 12 μm, fiber length 0.6 mm)
A decorative adhesive sheet was prepared in the same manner as in Example 2-1 except that 1.5 parts was blended, and the same evaluation was performed.

[Comparative Example 2-1] In the production of a thermoplastic resin film, cut fibers (acrylic fiber T901 manufactured by Nippon Exlan Industrial Co., Ltd., T901: fiber diameter 12) were used as short fibers.
A pressure-sensitive adhesive sheet for decoration was prepared and evaluated in the same manner as in Example 2-1 except that 1.5 parts of (μm, fiber length 7 mm) was blended.

[Example 3-1] In Example 1-1,
Wollastonite (NYCO Woll)
A sticky sheet for decoration was prepared and evaluated in the same manner as in Example 1-1, except that 3 parts of NYGLOS5 manufactured by Astonite (aspect ratio 13, average particle diameter 5 μm) were used.

[Embodiment 3-2] In Embodiment 3-1,
Wollastonite (NYCO Wollastonit)
e, NYGLOS5: Aspect ratio 13, average particle diameter 5 μm) Except that 10 parts were used, a decorative adhesive sheet was produced in the same manner as in Example 3-1 and the same evaluation was performed.

Example 3-3 In Example 3-1
Wollastonite (NYCO Wollastonit)
e, NYGLOS12: Aspect ratio 13, average particle diameter 12 μm) Except for using 3 parts, a decorative pressure-sensitive adhesive sheet was prepared and evaluated in the same manner as in Example 3-1.

Comparative Example 3-1 In Example 3-1
A decorative adhesive sheet was produced in the same manner as in Example 3-1 except that 3 parts of calcium carbonate (an aspect ratio of less than 2, average particle size of 3.5 μm) was used instead of wollastonite, and the same evaluation was performed. Was.

Comparative Example 3-2 In Comparative Example 3-1,
Calcium carbonate (aspect ratio less than 2, average particle size 3.
A decorative adhesive sheet was prepared and evaluated in the same manner as in Comparative Example 3-1 except that 10 parts (5 μm) was used.

[Example 4-1] In Example 2-1,
Wollastonite (NYCO Woll)
A sticky sheet for decoration was prepared and evaluated in the same manner as in Example 2-1 except that 3 parts of NYGLOS5 manufactured by Astonite (aspect ratio 13, average particle diameter 5 μm) were used.

[Example 4-2] In Example 4-1,
Wollastonite (NYCO Wollastonit)
e, NYGLOS5: Aspect ratio 13, average particle diameter 5 μm) Except that 10 parts were used, a decorative adhesive sheet was produced in the same manner as in Example 4-1 and the same evaluation was performed.

[Example 4-3] In Example 4-1,
Wollastonite (NYCO Wollastonit)
e, NYGLOS12: Aspect ratio 13, average particle diameter 12 μm) Except for using 5 parts, a decorative pressure-sensitive adhesive sheet was prepared and evaluated in the same manner as in Example 4-1.

[Comparative Example 4-1] In Example 4-1.
A decorative adhesive sheet was produced in the same manner as in Example 3-1 except that 3 parts of calcium carbonate (an aspect ratio of less than 2, average particle size of 3.5 μm) was used instead of wollastonite, and the same evaluation was performed. Was.

[Comparative Example 4-2]
Calcium carbonate (aspect ratio less than 2, average particle size 3.
5 μm) was used in the same manner as in Comparative Example 4-1 except that 10 parts of the pressure-sensitive adhesive sheet were used, and the same evaluation was performed.

Table 1 shows the above evaluation results.

[Table 1]

As can be seen from Table 1, all of the decorative adhesive sheets of the present invention were found to be excellent in appearance and tear strength, and also excellent in workability of punching characters.

[0043]

The decorative pressure-sensitive adhesive sheet of the present invention comprises a specific fiber or an inorganic material contained in at least one of the thermoplastic resin film and the pressure-sensitive adhesive layer. Can be provided without doing so. Accordingly, it has excellent workability in removing unnecessary portions and removing characters.

[0044]

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of the configuration of a decorative adhesive sheet of the present invention.

[Description of Signs] 1 Thermoplastic resin film 2 Adhesive layer 3 Release paper

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F100 AA01A AA01B AK01A AK25 AK25G AK27 AR00B BA02 CB05 DE01A DE01B DG03A DG03B GB07 HB00 JA20A JA20B JB16A JK03 JL05 JL13 JL13B 4J004 AA01 CA01 A01 CA01 A01CA01

Claims (4)

[Claims] A decorative pressure-sensitive adhesive sheet in which a pressure-sensitive adhesive layer is laminated on a base material layer made of a thermoplastic resin film,
A decorative pressure-sensitive adhesive sheet comprising a short fiber blended in at least one of the layers. 2. The decorative pressure-sensitive adhesive sheet according to claim 1, wherein a short fiber having a fiber diameter of 3 to 20 μm and a fiber length of 0.3 to 3 mm is blended with the thermoplastic resin film. Decorative adhesive sheet. 3. The decorative pressure-sensitive adhesive sheet according to claim 1, wherein the pressure-sensitive adhesive layer has a fiber diameter of 3 to 30 μm and a fiber length of 0.3 μm.
A decorative pressure-sensitive adhesive sheet comprising 3 to 5 mm short fibers. 4. A decorative pressure-sensitive adhesive sheet in which a pressure-sensitive adhesive layer is laminated on a base material layer made of a thermoplastic resin film,
A decorative pressure-sensitive adhesive sheet characterized in that at least one of the layers contains an inorganic material having an aspect ratio of 2 to 25 and a particle size of 0.5 to 30 μm.