JP2000063777A - Pressure sensitive adhesive sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a pressure sensitive adhesive sheet having curved surface- following properties same as the case using a vinyl chloride resin-based film regardless of the case using an olefinic resin capable of being readily burned, and excellent in weatherability. SOLUTION: This pressure sensitive adhesive sheet has a pressure-sensitive adhesive layers laminated on one surface of an olefinic resin substrate sheet. The olefinic resin substrate sheet comprises 100 pts.wt. olefinic resin, 3-90 pts.wt. vinylaromatic elastomer or elastomer having (-40)-50 deg.C peak temperature of tan δ in a dynamic viscoelasticity spectrum, 1-200 pts.wt. pigment, 0.5-5 pts.wt. hindered amine-based compound.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive adhesive sheet that can be used, for example, for advertisement stickers and display stickers used outdoors and indoors, and more specifically, it uses an olefin resin base sheet. The present invention relates to a pressure-sensitive adhesive sheet having excellent curved surface followability.

[0002]

2. Description of the Related Art Conventionally, various decorative marking films have been used as an advertisement sticker or a display sticker outdoors or indoors. A conventional decorative marking film is generally constituted by using a vinyl chloride resin film as a base material and forming an adhesive layer on one surface of the base material. More specifically, the production of this type of marking film has been carried out as follows.

That is, a pigment is kneaded into a base material made of a vinyl chloride resin film for coloring according to the purpose,
Alternatively, the surface of the substrate is printed. Next, an appropriate pressure-sensitive and / or heat-sensitive adhesive is applied to one surface of the base material to form an adhesive layer. Furthermore, in order to protect the pressure-sensitive adhesive layer, a release material such as release paper is attached on the pressure-sensitive adhesive layer. At the time of use, the release material is peeled off and the target portion is attached from the pressure-sensitive adhesive layer side.

By the way, the marking film is often used outdoors, and is used for various purposes. For example, it may be attached as an advertising sticker on a signboard, an advertising tower, a shutter, a show window, or the like. It is also used as a decorative stripe sticker in vehicles such as automobiles and motorcycles, and ships such as motor boats. It is also used to construct display stickers on traffic signs, road signs, guide boards, and the like.

Therefore, the marking film is strongly required to have weather resistance and sufficient flexibility to be attached to a curved surface. Since the conventional marking film uses a vinyl chloride resin film as a base material, it can be configured to have appropriate weather resistance and sufficient flexibility when attached to a curved surface. It was However, when a vinyl chloride resin film is used as a base material, the incinerator may be damaged due to generation of chlorine gas or hydrogen chloride gas during incineration / disposal. In other words, there is a problem that the incinerator is burdened, cannot be processed by a simple incinerator, and the durability of the incinerator is reduced. For this reason, waste is often disposed of in landfills, which inevitably burdens the environment.

Therefore, in recent years, a method of reducing the incineration load by using an olefin resin film as a substrate has been tried. For example, JP-A-8-157780
The publication discloses a pressure-sensitive adhesive sheet for decoration that can reduce the burden of incineration by using an olefin resin film as a base material.

However, JP-A-8-157780 only discloses that an olefin resin film is used, and does not show any specific content of the olefin resin film.

Further, when a marking film is formed by forming an adhesive layer on one surface of an olefin base material, the marking film is not sufficiently flexible as compared with a conventional marking film using a vinyl chloride resin film as a base material. The ability to follow curved surfaces was not sufficient, and it was extremely difficult to use it for the various applications described above. In addition, the olefin resin has poor weather resistance as compared with the vinyl chloride resin and is not suitable for long-term outdoor use.

In the case of molding into a sheet, there are many molding methods such as a calendering method and an extrusion method in the case of a vinyl chloride resin, and a sol-casting method in which the resin is dispersed in an organic solvent and cast. In the case of an olefin resin, it is substantially limited to an extrusion method in which it is melted at 300 ° C. or higher and extruded.

For this reason, there is a problem that only heat-resistant pigments that do not fade even under heating conditions of 300 ° C. or more can be used, and usable pigments are limited. Further, although the detailed mechanism is unknown, the same pigments are used. However, there is also a problem that even if the same amount is added, the color developability is worse than that of the vinyl chloride resin.

Further, in JP-A-8-157780, a coating layer is provided on one side of a base material made of a polyolefin resin film to exert decorative properties, so that the production process is complicated and the decorative marking is used. There is also a problem that the cost for manufacturing the film is high.

[0012]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned drawbacks of the prior art and to use an olefin resin base material capable of reducing the incineration burden, yet to provide sufficient flexibility. Accordingly, it is an object of the present invention to provide a pressure-sensitive adhesive sheet which has excellent adhesiveness to curved surfaces, weather resistance and decorative effects, and can reduce manufacturing cost.

[0013]

A pressure-sensitive adhesive sheet according to the invention as defined in claim 1 comprises 100 parts by weight of an olefin resin,
3 to 90 parts by weight of vinyl aromatic elastomer and pigment 1
~ 200 parts by weight, and hindered amine compound 0.5 ~
An adhesive layer is laminated on one surface of an olefin resin base sheet containing 5 parts by weight.

The pressure-sensitive adhesive sheet according to the second aspect of the present invention has 100 parts by weight of an olefin resin and a peak temperature of tan δ in the dynamic viscoelastic spectrum of −40 to 50 ° C.
3 to 90 parts by weight of elastomer in the range of 1 to 1 and pigment 1 to
200 parts by weight and a hindered amine compound 0.5 to 5
An adhesive layer is laminated on one surface of an olefin resin base sheet including a part by weight.

In the pressure-sensitive adhesive sheet according to the third aspect of the present invention, a styrene-butadiene block copolymer, a styrene-isoprene block copolymer, or a hydrogenated product thereof is used as the elastomer.

The details of the present invention will be described below. (Olefin-based resin base sheet) In the present invention, the olefin-based resin base sheet contains the olefin-based resin, the elastomer, the pigment, and the hindered amine-based compound in the above-described specific proportions, as described above.

Here, as the olefin resin,
Various olefin resins can be used, for example:
Polyethylene such as low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene; polypropylene; ethylene-vinyl acetate copolymer,
Ethylene-ethyl acrylate copolymer, ethylene-α
Examples include ethylene-based copolymers such as olefin copolymers, and those obtained by mixing these olefin-based resins with elastomers such as styrene-based resins. Among them, a polymer having ethylene and / or propylene as a main constituent unit can be preferably used, and for example, polyethylene, polypropylene or a mixture thereof can be preferably used.

In the above olefin resin sheet base material, since the flexibility is not sufficient when it is composed of only the olefin resin, the elastomer is blended in order to enhance the flexibility. This elastomer is based on olefin resin 1
It is mixed in a proportion of 3 to 90 parts by weight with respect to 00 parts by weight. When the blending ratio of the elastomer is less than 3 parts by weight, the flexibility of the olefin resin base sheet is insufficient and the followability to a curved surface is deteriorated, and when it exceeds 90 parts by weight, it becomes too soft and coated. However, since the actual construction work is extremely difficult and the elastomer is expensive, the cost of the pressure-sensitive adhesive sheet is high.

As the above-mentioned elastomer, in the invention described in claim 1, a vinyl aromatic elastomer is used. The vinyl aromatic elastomer is not particularly limited, but preferably styrene-butadiene. A block copolymer, a styrene-isoprene block copolymer, or a hydrogenated product thereof is preferably used.

Further, in the invention described in claim 2, as the elastomer, ta in the dynamic viscoelastic spectrum is used.
A peak temperature of nδ in the range of -40 to 50 ° C is used. The above-mentioned styrene-butadiene block copolymer, styrene-isoprene block copolymer, or hydrogenated products thereof have a t in the dynamic viscoelastic spectrum.
The peak temperature of an δ is in the range of −40 to 50 ° C.

In the present specification, the peak temperature of tan δ in the above dynamic viscoelastic spectrum means a frequency of 100 M when the dynamic viscoelasticity is measured by a dynamic viscoelasticity measuring machine.
It means the peak value of tan δ at Hz.

When the peak temperature of tan δ is lower than −40 ° C., the flexibility of the olefin resin base sheet is not sufficiently high and the followability to curved surface is not sufficient,
If it exceeds 50 ° C., the effect of improving the followability to a curved surface cannot be obtained.

However, in the pressure-sensitive adhesive sheet according to the second aspect of the present invention, the elastomer is not particularly limited to the vinyl aromatic elastomer, and the peak temperature of tan δ in the dynamic viscoelastic spectrum is the above-specified value. An appropriate elastomer within the range can be used. Preferably, since kneading with an olefin resin is easy, a thermoplastic elastomer is used in the invention according to claim 3, and more preferably, 50% or more of styrene and isoprene have a structure as shown below. It is preferably polymerized to have 3,4 bonds.

[0024]

[Chemical 1]

Further, in order to suppress the fish eye phenomenon in the case of continuously producing an olefin resin base sheet, a hydrogenated product of a block polymer of styrene and isoprene is used, and 50% or more of the diene part of the isoprene is used. Those in which is hydrogenated are preferably used.

In the pressure-sensitive adhesive sheet according to the present invention, in order to color the olefin resin base sheet itself, the pigment is mixed in a ratio of 1 to 200 parts by weight with respect to 100 parts by weight of the olefin resin. If the blending ratio of the pigment is less than 1 part by weight, the target hue cannot be obtained, and if it is more than 200 parts by weight, the dispersibility of the pigment in the base material is not uniform and color unevenness occurs, Since the unit price is high, the cost of the adhesive sheet is high.

The above-mentioned pigment is not particularly limited, and it is the usual extrusion molding temperature of olefin resin.
As long as it has heat resistance at about 0 ° C, it can be appropriately selected according to the purpose, and examples thereof include azo-based, phthalocyanine-based, slene-based, dye lake-based, quinacridone-based, dioxazine-based organic pigments, and oxidation agents. Oxides such as titanium, chromate molybdate, sulfides / selenides,
Examples include ferrocyanide-based inorganic pigments such as calcium carbonate.

In the present invention, the olefin resin 10
A hindered amine compound is added in an amount of 0.5 to 5 parts by weight to 0 part by weight in order to enhance weather resistance. If the blending ratio of the hindered amine compound is less than 0.5 parts by weight, the weather resistance will be reduced, and if it is more than 5 parts by weight, the weather resistance improving effect will be saturated and the cost of the adhesive sheet will be high.

The above hindered amine compounds include
Although not particularly limited, the following compounds 1) to 1
1) can be exemplified. 1) 2,2,4,4-tetramethylpiperidyl-4-benzoate 2) Bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate 3) Tris (2,2,6,6-tetra Methyl-4-piperidyl) phosphite 4) 1,3,8-triaza-7,7,9,9-tetramethyl-3-n-octylspiro [4,5] decane-2,
4-dione 5) 1,2,3,4-tetra (4-carbonyloxy 2,2,6,6-tetramethylpiperidyl) -butane 6) 1,3,8-triaza-7,7,9,9 -Tetramethyl-2,4-dioxose pyro [4,5] decane 7) tri (4-acetoxy-2,2,6,6-tetramethylpiperidyl) amine 8) 4-acetoxy-2,2,6,6- Tetramethylpiperidine 9) 4-stearoyloxy-2,2,6,6-tetramethylpiperidine 10) 4-benzyloxy-2,2,6,6-tetramethylpiperidine 11) 4-phenylcarbamoyloxy-2,2 , 6,
The 6-tetramethylpiperidine olefin resin base sheet has a formability into a sheet,
Other additives may be added as long as the physical properties of the sheet are not impaired, and examples of the additives include an ultraviolet absorber and a heat stabilizer.

Examples of the ultraviolet absorber include salicylic acid ester-based, benzophenone-based, benzotriazole-based, and cyanoacrylate-based ultraviolet absorbers.

Examples of the heat stabilizer include metal soap heat stabilizers, organotin heat stabilizers, lead heat stabilizers, antimony heat stabilizers, non-metal heat stabilizers and the like.
In obtaining the pressure-sensitive adhesive sheet according to the present invention, the olefin resin substrate sheet is formed into a film by an appropriate method such as the T-die method or the inflation molding method which has been conventionally used after the above-mentioned essential components are blended. Can be obtained. Since the film-formed olefin resin base sheet generally has a low surface tension, it is desirable to improve the adhesiveness of the pressure-sensitive adhesive layer by a surface modification treatment such as corona treatment.

The thickness of the olefin-based resin base sheet is not particularly limited, but is 20 to 15
The range of 0 μm is preferable, and 40 to 100 is more preferable.
The range is μm. When the thickness of the olefin-based resin base sheet is less than 20 μm, the base sheet itself becomes too soft, and the sticking work may be difficult, or the mechanical strength of the base sheet may decrease, and the thickness may be 150 μm. On the other hand, if it exceeds, it becomes hard and the followability to a curved surface may deteriorate.

(Adhesive layer) In the present invention, an adhesive layer is formed by laminating an adhesive layer on one surface of the olefin resin substrate sheet obtained as described above.

Here, the pressure-sensitive adhesive used in the pressure-sensitive adhesive layer is not particularly limited, and an acrylic or rubber-based pressure-sensitive adhesive which has been conventionally used can be used. However, when used as a decorative marking film, since it is often used outdoors, it is desirable to use an acrylic pressure-sensitive adhesive having excellent weather resistance.

As the acrylic pressure-sensitive adhesive, one having a homopolymer of an alkyl (meth) acrylate or a copolymer of an alkyl (meth) acrylate and another vinyl monomer as a main component is preferably used.

As the above-mentioned alkyl (meth) acrylate, an alkyl (meth) acrylate having an alkyl group having 1 to 12 carbon atoms, more preferably an alkyl (meth) acrylate having an alkyl group having 4 to 12 carbon atoms is used. Specifically, as the alkyl (meth) acrylate, n-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, n-octyl (meth) acrylate, isononyl (meth) acrylate, Examples thereof include lauryl (meth) acrylate.

These alkyl (meth) acrylates may be used alone or in combination of two or more. However, considering the balance between tackiness and cohesiveness, etc., usually, the main component is an alkyl (meth) acrylate having a homopolymer glass transition temperature (Tg) of -50 ° C. or lower, and methyl (meth) It is desirable to use an alkyl (meth) acrylate having a small number of carbon atoms in the alkyl group, such as (meth) acrylate or ethyl (meth) acrylate.

In addition to the above-mentioned alkyl (meth) acrylates, vinyl monomers copolymerizable therewith may be copolymerized. Such vinyl monomers to be copolymerized include (meth) acrylic acid, maleic acid,
Carboxyl group-containing vinyl monomers such as fumaric acid or itaconic acid or anhydrides thereof; 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth)
Examples thereof include hydroxyl group-containing vinyl monomers such as acrylate, polyoxyethylene (meth) acrylate, polyoxypropylene (meth) acrylate, and caprolactone modified (meth) acrylate.

When the pressure-sensitive adhesive layer is formed using the acrylic pressure-sensitive adhesive, it may contain the above-mentioned acrylic copolymer as a main component and may further contain a known tackifying resin. The acrylic pressure-sensitive adhesive may be a solvent-type acrylic pressure-sensitive adhesive polymerized in a solvent, or an emulsion-type acrylic pressure-sensitive adhesive polymerized in water. Further, it may be a bulk polymerization type acrylic pressure-sensitive adhesive obtained by irradiating the monomer mixture with ultraviolet rays.

(Lamination of pressure-sensitive adhesive layer) In the pressure-sensitive adhesive sheet according to the present invention, the pressure-sensitive adhesive layer is laminated on one surface of the olefin resin base sheet, and in this case, the method for laminating the pressure-sensitive adhesive layer is not particularly limited. Not done. That is, the pressure-sensitive adhesive is applied to the surface of a release material such as release paper by a quantitative coating method, heated and dried, and then laminated on one surface of an olefin-based resin base sheet, or an olefin-based resin base sheet. A method of directly coating the adhesive on one surface can be adopted.

The thickness of the pressure-sensitive adhesive layer is not particularly limited, but when it is used as a decorative marking film and the adhesive strength with respect to the adherend and the followability with respect to a curved surface are taken into consideration, it is in the range of about 10 to 50 μm. It is desirable to do.

The pressure-sensitive adhesive sheet according to the present invention has a structure in which the pressure-sensitive adhesive layer is laminated on one surface of the olefin resin base sheet as described above. However, when commercialized, the pressure-sensitive adhesive layer is usually protected. In order to do so, the release agent covers the pressure-sensitive adhesive layer. The release material is not particularly limited, but for example, silicone-treated release paper or the like can be used.

The pressure-sensitive adhesive sheet obtained above may be attached to the entire surface of the adherend to be decorated, or after cutting into desired figures and characters by a computer-controlled cutting machine, unnecessary portions are removed. It may be debris removed and transferred to an adherend using an application adhesive tape.

(Function) Since the pressure-sensitive adhesive sheet according to the present invention uses the olefin-based resin base sheet mainly containing olefin-based resin, the incineration burden at the time of incineration disposal is reduced as compared with the vinyl chloride resin-based base. You can Further, with respect to the olefin resin, the vinyl aromatic elastomer is used in the invention described in claim 1, and the tan δ peak temperature in the dynamic viscoelastic spectrum is used in the invention described in claim 2 in the specific range. Since it is blended in the above-mentioned specific ratio, a base material sheet which is excellent in flexibility and conforms to a curved surface while using an olefin resin is constituted.

Furthermore, since the hindered amine compound is blended with the olefin resin in the above-mentioned specific ratio, the weather resistance is also enhanced. That is, the present invention, when forming a substrate sheet mainly olefin-based resin capable of reducing the incineration burden, by increasing the flexibility by blending the vinyl aromatic-based elastomer or the specific elastomer the specific amount It is characterized in that it sufficiently exhibits conformability to curved surfaces and that the hindered amine compound is blended in the above-mentioned specific ratio to enhance the weather resistance.

[0046]

EXAMPLES The present invention will now be described in more detail with reference to specific examples. However, the present invention is not limited to the following examples.

(Materials used) In the following examples and comparative examples, the following olefin resins and elastomers were used.

Olefin resin: low-density polyethylene (manufactured by Japan Polychem, product number: UF840, MFR
1.5 g / 10 minutes) Olefin resin ... Polypropylene (manufactured by Japan Polyolefin Co., product number: FA465, MFR 7.0 g / 10
Min) Elastomer: vinyl aromatic elastomer styrene-isoprene block copolymer (Kuraray Co., Ltd., trade name: High Blur, product number: VS-1, tanδ peak temperature = 20 ° C) Elastomer: vinyl aromatic elastomer Hydrogenated styrene-isoprene block copolymer (manufactured by Kuraray Co., Ltd., trade name: Septon, product number: 2007) Elastomer ... Styrene-butadiene block copolymer which is a vinyl aromatic elastomer (manufactured by Asahi Kasei Co., product name: Toughprene, product number : 125) Elastomer ... Vinyl aromatic elastomer hydrogenated styrene butadiene random copolymer (manufactured by Japan Synthetic Rubber Co., product number: 1320P) Elastomer ... styrene-isoprene block copolymer (manufactured by Kuraray Co., Ltd., product name: Hybler, product number) : HVS-
3, tan δ peak temperature = -5 ° C) Elastomer: styrene-isoprene block copolymer (manufactured by Shell, product number: TR1107, tan δ peak temperature = -72 ° C) Elastomer: styrene-butadiene block copolymer (manufactured by Asahi Kasei Corp., Product name: Tuftec, Product number: H105
1, tan δ peak temperature = 95 ° C.) (Example 1) As shown in Table 1 below, an olefin resin (manufactured by Nippon Polychem, product number: UF840) 100
Parts by weight and elastomer (Kuraray Co., product number: VS-
1) 10 parts by weight, 13 parts by weight of a blue composite pigment (a mixture of cyanine blue, chrome yellow and titanium oxide) and a hindered amine compound (Ciba Geigy, trade name:
Tinuvin 622) 1 part by weight,
A film was formed by a T-die method so as to have a thickness of 50 μm, and corona treatment was performed in-line so that the surface energy was 42 dyne / cm. On the other hand, a two-component cross-linking acrylic adhesive (manufactured by Toyo Ink Co., Ltd., trade name: BPS 5520) was applied to a release paper whose surface was treated with silicone so that the thickness after drying was 40 μm using a comma coater. did. The pressure-sensitive adhesive layer coated on this release paper was laminated on one surface of the colored olefin resin substrate sheet obtained as described above to obtain the pressure-sensitive adhesive sheet of Example 1.

(Examples 2 to 12) The olefin resin and elastomer used were changed as shown in Tables 1 and 2 below, and the mixing ratios of the pigment and the hindered amine compound are shown in Tables 1 and 2 below. Adhesive sheets of Examples 2 to 12 were obtained in the same manner as in Example 1 except that the changes were made as shown.

Comparative Examples 1 to 12 The olefin resin and the elastomer were blended as shown in Tables 1 and 2 below, and the blending ratios of the pigment and the hindered amine compound are shown in Tables 1 and 2 below. Adhesive sheets of Comparative Examples 1 to 12 were obtained in the same manner as in Example 1 except that the above changes were made.

Comparative Examples 13 to 16 As shown in Table 3 below, a vinyl chloride resin, a plasticizer, a stabilizer, a white pigment and a solvent were mixed to prepare an organosol. The obtained organosol was coated on a alkyd resin coating step paper with a comma coater and dried at a temperature of 180 ° C. for 7 minutes to obtain a vinyl chloride resin base sheet having a thickness of 60 μm. The pressure-sensitive adhesive sheets of Comparative Examples 13 to 16 were obtained by laminating the pressure-sensitive adhesive layer and the release paper on one surface of the obtained vinyl chloride-based resin substrate sheet in the same manner as in Example 1.

[0052]

[Table 1]

[0053]

[Table 2]

[0054]

[Table 3]

(Evaluation) Regarding each of the pressure-sensitive adhesive sheets of Examples and Comparative Examples obtained as described above, when used as a marking film, curved surface workability, film handleability, appearance (color unevenness), weather resistance, incineration The sex was evaluated as follows. The results are shown in Tables 4 and 5 below.

Curved surface workability: Each adhesive sheet is first adhered to the apex portion 1a of the corrugated board 1 on the upper surface of the corrugated board 1 (manufactured by Nippon Full Half Co., Ltd.) shown in a sectional view in FIG.
Next, the pressure-sensitive adhesive sheet was pushed in with a dedicated construction tool, so as to adhere to the valley portion, and adhered. After standing at a temperature of 23 ° C. for 3 days, the floating state of the pressure-sensitive adhesive sheet was visually evaluated on a 5-point scale. The evaluation criteria are as follows.

5 points: Appropriate flexibility was exhibited, and there was no problem in construction on an adherend having a curved surface. 4 points: It has an appropriate flexibility, but it feels a little strange in its softness or hardness, but there was no problem in the construction on a curved surface adherend. 3 points ... Probably because of insufficient flexibility, it was slightly difficult to apply to a curved adherend. 2 points: Due to insufficient flexibility, it was extremely difficult to apply it to curved adherends. 1 point: Due to insufficient flexibility, it was not possible to perform construction on a curved adherend.

Handleability: The handleability of the pressure-sensitive adhesive sheet alone after peeling the pressure-sensitive adhesive sheet from the release paper was evaluated on a scale of 5 levels. The evaluation criteria are as follows.

5 points: The pressure-sensitive adhesive sheet has appropriate flexibility,
There was no problem in handling. 4 points ... I feel a little strange in the flexibility of the adhesive sheet,
There was no problem. 3 points: It was difficult to handle because the base material sheet was too soft. The self-adhesion phenomenon sometimes occurred due to the bending of the base material sheet. 2 points ... Because the base material sheet was too soft, it was necessary to handle it with extreme caution. The self-adhesion phenomenon due to the bending of the base sheet frequently occurred. 1 point: The base material sheet was too soft to be handled practically.

Appearance (color unevenness) ... The appearance of each pressure-sensitive adhesive sheet was visually evaluated. The contents of the evaluation symbols in Tables 4 and 5 are as follows. O: No color unevenness was observed. B: Some color unevenness was noticeable and there was a problem in quality. X: Color unevenness was noticeable, and the product did not have quality.

Weather resistance: Each pressure-sensitive adhesive sheet was subjected to accelerated exposure using an accelerated exposure machine (manufactured by Dainippon Plastics Co., Ltd., trade name: Super UV Tester), and the degree of fading after 144 hours was evaluated. The meanings of the evaluation symbols are as follows. ○: Almost no fading occurred. B: Some fading occurred. ×: The fading was terrible.

Incinability determination property: Each pressure-sensitive adhesive sheet was cut into a size of 5 cm × 5 cm to prepare a sample. This sample was burned in a closed container, the generated gas was collected in a syringe, and the presence or absence of hydrogen chloride and chlorine gas was measured by gas chromatography. The meanings of the evaluation symbols in Tables 4 and 5 are as follows. O: Hydrogen chloride or chlorine was not detected. × ... Hydrogen chloride or chlorine was detected.

[0063]

[Table 4]

[0064]

[Table 5]

[0065]

In the pressure-sensitive adhesive sheet according to the invention described in claim 1, an olefin resin base sheet containing an olefin resin, a vinyl aromatic elastomer, a pigment and a hindered amine compound in the above-mentioned specific proportions is used. Therefore, it is excellent in handleability, conformability to a curved surface, and weather resistance similar to those of a pressure-sensitive adhesive sheet using a conventional vinyl chloride resin sheet substrate. Moreover, when a vinyl chloride resin sheet base material is used, the burden of incineration is large and it is necessary to dispose of it in landfill, whereas in the adhesive sheet according to the invention of claim 1, the olefin resin is mainly used. Therefore, it can be easily incinerated and discarded by using a simple incineration facility.

Moreover, since the olefin resin base sheet is colored by containing the pigment in the above-mentioned specific ratio, it is not necessary to separately laminate a coloring layer, and thus it is used as an adhesive marking film, for example. The sheet can be efficiently and inexpensively produced.

Similarly, in the invention described in claim 2, the olefin resin, the elastomer having the peak temperature of tan δ in the dynamic viscoelastic spectrum in the above specific range, the pigment and the hindered amine compound in the above specific ratio are also added. Since the olefin resin base sheet containing the same is used, it exhibits the same handleability and curved surface followability as the conventional vinyl chloride resin marking film, and further has excellent weather resistance. In addition, after use, it can be incinerated and discarded in a simple incineration facility, and since the pigment is contained and colored, the complicated step of forming the coating film can be omitted, so the decorative marking is inexpensive A pressure-sensitive adhesive sheet suitable as a film can be provided.

In the invention described in claim 3, since a styrene-butadiene block copolymer, a styrene-isoprene block copolymer, or a hydrogenated product thereof is used as the elastomer, the flexibility of the pressure-sensitive adhesive sheet according to the present invention is improved. The adhesiveness can be appropriately enhanced, and a pressure-sensitive adhesive sheet excellent in curved surface followability can be configured.

Therefore, according to the present invention, a pressure-sensitive adhesive sheet suitable for a decorative marking film or the like which has the same performance as a marking film using a conventional vinyl chloride resin base sheet and is excellent in environmental resistance. Can be provided.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a cross section and a size of a corrugated plate prepared as an adherend when evaluating the pressure-sensitive adhesive sheets of Examples and Comparative Examples.

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 4F100 AH03H AK03A AK06 AK07                       AK08J AK11A AK12A AK12J                       AK25 AK28A AK73A AL02A                       AL09A AR00B BA02 BA03                       CA05A CA06A CA13A GB90                       JA06A JK07A JL01 JL09                       JL13B YY00A                 4J002 BB031 BB051 BB061 BB071                       BB121 BP012 DE136 DE166                       DE236 DF026 DG026 EQ016                       EU006 EU077 EU087 EU157                       EW067 EZ006 FD047 FD096                       GF00 GT00                 4J004 AA05 AA10 AB01 CA04 CC02                       DB02 FA01

Claims (3)

[Claims] 1. An olefin resin 100 parts by weight, a vinyl aromatic elastomer 3 to 90 parts by weight, and a pigment 1 to 2.
A pressure-sensitive adhesive sheet comprising an olefin-based resin base sheet including 100 parts by weight and 0.5 to 5 parts by weight of a hindered amine-based compound, and an adhesive layer laminated on one surface of the olefin-based resin base sheet. 2. An olefin resin having 100 parts by weight and a tan δ peak temperature in a dynamic viscoelastic spectrum of −4.
An adhesive layer is provided on one surface of an olefin resin base sheet containing 3 to 90 parts by weight of an elastomer in the range of 0 to 50 ° C., 1 to 200 parts by weight of a pigment, and 0.5 to 5 parts by weight of a hindered amine compound. An adhesive sheet characterized by being laminated. 3. The pressure-sensitive adhesive sheet according to claim 1, wherein the elastomer is a styrene-butadiene block copolymer, a styrene-isoprene block copolymer, or a hydrogenated product thereof.