JP2003183602A - Decorative adhesive tape - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decorative adhesive tape using a colored film, developing good chroma and opacifying properties, scarcely influenced by a colored pattern of an adherend and having uniform appearance. <P>SOLUTION: This decorative adhesive tape is obtained by laminating adhesive layers each containing 100 pts.wt. base polymer of the adhesive, 3-50 pts.wt. white pigment and an aluminium metal piece [preferably having ≥76 L-asterisk value (psychometric lightness)] in an amount of 0.3-2 wt.% based on the white pigment added on one side of a colored film having 3-80% total light transmission. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a decorative pressure-sensitive adhesive sheet used indoors and outdoors. The decorative pressure-sensitive adhesive sheet of the present invention includes a decorative pressure-sensitive adhesive film and a decorative pressure-sensitive adhesive tape.

[0002]

2. Description of the Related Art With respect to a decorative pressure-sensitive adhesive sheet, the appearance of the product is very important, and in the case of a signboard for outdoor decoration, a highly saturated color tends to be preferred. Conventionally, there are roughly two types of methods for expressing highly saturated colors. One is to provide a white adhesive layer mixed with a white pigment such as titanium oxide on one side of a substrate such as a transparent film, and use the fact that the light passing through the film is reflected by the white adhesive layer. This is a method for improving the degree of the degree (see Japanese Patent Laid-Open No. 5-108011). Another is a method in which a white film is laminated on a base material such as a transparent film and the saturation is improved by utilizing the fact that light passing through the transparent film is reflected by the white film layer. Both methods are widely used for decorative adhesive sheets.

However, in the former method of providing a white pressure-sensitive adhesive layer, there is usually a limit to the amount of white pigment added within a range that does not impair the physical properties of the pressure-sensitive adhesive. There is a problem that the hiding property of the color pattern tends to be insufficient. In the method of making the film multi-layered like the latter so as to make the saturation and the concealing property compatible, there is a problem that the manufacturing process becomes complicated and the cost becomes high, and further, by making the film multi-layered, As the thickness increases,
There was a problem that the workability was deteriorated and the film was lifted when the product was stored in a roll form, resulting in an abnormal appearance.

As a method for improving the concealing property of the pressure-sensitive adhesive layer, Japanese Patent Laid-Open No. 58-57945 discloses a transparent pressure-sensitive adhesive liquid containing aluminum metal pieces, inorganic pigments such as chrome yellow and carbon black, and azo-based pigments. , A method in which a mixed pressure-sensitive adhesive mixed with pigments of various tones such as quinoline-based organic pigments is applied to one surface of a transparent or semi-transparent plastic film substrate and dried to be used.

[0005]

However, in the case of this method, according to the study by the present inventors, when the transparent or translucent film is colored and used, the mixed adhesive reduces the saturation. There is a problem that it is difficult to develop a desired color due to the adverse effect on the direction. In view of the problems of the conventional decorative pressure-sensitive adhesive sheet, an object of the present invention is to develop good color saturation and hiding power even in a decorative pressure-sensitive adhesive sheet that uses a colored film, and the color pattern of the adherend. The object is to provide a pressure-sensitive adhesive sheet for decoration that is less affected by.

[0006]

The decorative pressure-sensitive adhesive sheet according to claim 1 has 3 to 80 parts by weight of a base film of a pressure-sensitive adhesive, on one side of a colored film having a total light transmittance of 3 to 80%. It is characterized by comprising 50 parts by weight of a white pigment and a pressure-sensitive adhesive containing 0.3 to 2% by weight of the amount of the white pigment added, which is an aluminum metal piece. The decorative pressure-sensitive adhesive sheet according to claim 2 is the decorative pressure-sensitive adhesive sheet according to claim 1, wherein the L * value (brightness index) of the aluminum metal piece is 76.
The above is characterized.

The present invention will be described in more detail below. In the present invention, a colored film having a total light transmittance of 3 to 80% is used. When the total light transmittance of the colored film is less than 3%, the reflected light from the pressure-sensitive adhesive layer containing the white pigment and the aluminum metal piece cannot be sufficiently obtained, and it becomes difficult to improve the saturation. If the total light transmittance exceeds 80%, the light reflected by the pressure-sensitive adhesive layer containing the white pigment and the aluminum metal pieces may be too strong, and the color may be too whitish.

The pigment used for coloring the above colored film is not particularly limited, and various pigments conventionally used for coloring are used.

The method for molding the above-mentioned colored film is not particularly limited, and for example, a calender-molded film or a cast-molded film can be used.

The thickness of the colored film is not particularly limited, but a thickness of 40 to 120 μm is practically preferable. If the thickness is less than 40 μm, it may be too thin and the tensile strength may be weak, resulting in poor workability. On the other hand, if the thickness exceeds 120 μm, the film becomes too stiff, and in this case as well, workability problems may occur.

The material of the colored film is not particularly limited, and examples thereof include soft vinyl chloride resin film, acrylic resin film, polyester resin film (preferably polyethylene terephthalate resin film),
Polyurethane-based resin films and the like can be mentioned. Among them, it is preferable to use a soft vinyl chloride resin film from the viewpoint of film hardness, workability and cost.

The vinyl chloride resin used for the soft vinyl chloride resin film is not particularly limited, but for example, it is polymerized by emulsion or microsuspension, the particle size is 0.3 to 5.0 μm, and the degree of polymerization is 100.
The thing of 0-5000 is preferable.

The method for molding the above-mentioned soft vinyl chloride resin film is not particularly limited, and in addition to vinyl chloride resin, plasticizer, pigment, solvent, if necessary, a heat stabilizer and a bulking agent,
For example, a method such as casting molding in which a sol-like composition containing an ultraviolet absorber or the like (hereinafter sometimes referred to as an organosol) is cast on the surface of the process paper, dried and molded is used.

The plasticizer is not particularly limited, and examples thereof include phosphoric acid plasticizers such as tributyl phosphate, tri-2-ethylhexyl phosphate, triphenyl phosphate, diethyl phthalate, dibutyl phthalate, and the like. Phthalic acid plasticizers such as di-2-ethylhexyl phthalate and diisononyl phthalate, adipic acid plasticizers such as dibutyl adipate, di-n-hexyl adipate, di-2-ethylhexyl adipate and diisononyl adipate, and Examples include polyester-based plasticizers.

The above-mentioned pigment is not particularly limited, and examples thereof include azo pigments such as Lake Red C and Hansa Yellow,
Phthalocyanine blue, phthalocyanine pigments such as phthalocyanine green, slender pigments such as induslen blue, perylene orange, dye lake pigments such as rhodamine lake, eosin lake, quinacridone red, quinacridone magenta, dioxane violet, cadmium yellow, chrome vermillion, Examples thereof include carbon black and titanium oxide.

The solvent is not particularly limited, but
Generally, a dispersion solvent that slightly swells vinyl chloride resin at room temperature to promote dispersion, and a solvent that is insoluble in vinyl chloride resin and reduces the viscosity of a sol-like composition to suppress the swelling property of the dispersion solvent. Used as a mixture with a diluting solvent. Further, a mixed solvent composed of a petroleum fraction may be used in consideration of industrial profitability.

Examples of the dispersion solvent include DIBK.
(Diisobutyl ketone), MIBK (isobutyl methyl ketone) and other ketone-based compounds, butyl acetate and other ester-based compounds,
Examples of the solvent include glycol ethers, and examples of the diluent solvent include solvents such as paraffinic hydrocarbons, naphtheneic hydrocarbons, aromatic hydrocarbons, and terpenes. Also,
Examples of the mixed solvent composed of the petroleum fraction include "Solvesso", "Exsol", and "Isopar" manufactured by Exxon Chemical Co., Ltd.

Examples of the heat stabilizers include epoxidized vegetable oils such as epoxidized soybean oil and epoxidized linseed oil,
Epoxidized fatty acid ester, epoxidized alicyclic compound such as epoxidized tetrahydrophthalate, bisphenol A diglycidyl ether, epoxidized polybutadiene, organic stabilizer such as tributyl phosphite, triisooctyl phosphite, Ba / Zn System stabilizer, Ba
Examples include metal-based stabilizers such as / Pb-based stabilizers and Ca / Zn-based stabilizers. Of these, epoxidized soybean oil is particularly preferably used in calendar molding because it has a function as a plasticizer in addition to a heat stabilizer.

Examples of the above-mentioned extender include calcium carbonate, talc (preferably chlorinated magnesium silicate), kaolin (aluminum silicate), silica and the like. Examples of the ultraviolet absorber include salicylate-based, O-hydroxybenzophenone-based, and O-hydroxyphenylbenzotriazole-based ultraviolet absorbers.
Those having a high molecular weight are preferable because they are excellent in stability over time.

The base polymer of the pressure-sensitive adhesive used in the present invention is not particularly limited, and examples thereof include base polymers of general-purpose pressure-sensitive adhesives of rubber type, acrylic type, silicone type, etc. Considering the aspect, it is preferable to be a base polymer of an acrylic adhesive.

The base polymer of the pressure-sensitive adhesive may contain a curing agent if necessary. Also,
In order to further improve the weather resistance, it is preferable that the base polymer of the pressure-sensitive adhesive is blended with an ultraviolet absorber, and the number of parts of the ultraviolet absorber added is 1 with respect to 100 parts by weight of the base polymer of the pressure-sensitive adhesive. It is preferably about 6 parts by weight.

The pressure-sensitive adhesive used in the present invention is 3 to 50 parts by weight based on 100 parts by weight of the base polymer of the above-mentioned pressure-sensitive adhesive.
It is necessary that the content of the white pigment is 0.3 parts by weight of the white pigment and 0.3 to 2% by weight of the amount of the white pigment added. When the amount of the white pigment added is less than 3 parts by weight, the color pattern of the adherend is insufficiently concealed and it is difficult to express the saturation. When the amount of the white pigment added exceeds 50 parts by weight, the adhesive property deteriorates. Easy to do. The white pigment is not particularly limited as long as it does not impair the effects of the present invention, and examples thereof include titanium oxide, zinc oxide, calcium carbonate, aluminum oxide and the like. Among them, titanium oxide is preferable in terms of coloring power and hiding power.

If the content of the aluminum metal pieces is too small, the effect of improving the hiding property is difficult to be exhibited, and if the content is too large, the white color of the pressure-sensitive adhesive layer becomes turbid and it is difficult to improve the saturation. It is set to 0.3 to 2% by weight of the pigment addition amount.

The aluminum metal piece is used for improving the concealing property without substantially affecting the whiteness of the pressure-sensitive adhesive, and the L * value (brightness index) is 76 or more. Preference is given to using. The L * value (brightness index) is based on the CIE (International Commission on Illumination) 1976 color system. When the L * value (brightness index) is less than 76, the hiding property is improved, but the white color of the pressure-sensitive adhesive layer may be turbid and it may be difficult to improve the saturation.

The particle size and aspect ratio of the aluminum metal pieces are not particularly limited as long as they do not affect the physical properties of the pressure-sensitive adhesive, and the average particle size is usually about 5 to 35 μm.

Generally, aluminum metal pieces are used in the form of an aluminum paste by adding and mixing a solvent because it is necessary to disperse the aluminum metal pieces in the pressure-sensitive adhesive. It is preferable to use a low boiling point solvent such as toluene instead of a high boiling point solvent such as fractions. Incidentally, the above-mentioned aluminum metal piece may be one to which other coloring agents, extenders and the like are added as long as the effect of the present invention is not impaired, and the aluminum metal piece is subjected to various treatments on its surface. It may be

The method for producing the decorative pressure-sensitive adhesive sheet of the present invention is not particularly limited, but after coating the pressure-sensitive adhesive on the release paper and evaporating the solvent in a drying oven to form a pressure-sensitive adhesive layer,
A method of laminating a colored film is common. The thickness of the pressure-sensitive adhesive layer is not particularly limited, but is 20
It is preferably ˜50 μm. If the thickness is less than 20 μm, the adhesive property may not be sufficiently exhibited.
If it exceeds μm, the hiding property is improved, but the cost is increased and the productivity may be deteriorated.

(Function) The decorative pressure-sensitive adhesive sheet of the present invention comprises a colored film having a total light transmittance of 3 to 80% on one side.
Since a pressure-sensitive adhesive containing a specific amount of white pigment and aluminum metal pieces is laminated, the mechanism of action is not necessarily clear, but when light passing through the colored film is reflected by the pressure-sensitive adhesive layer, It is considered that the use of the aluminum metal piece having a high lightness allows the pressure-sensitive adhesive layer to exhibit the hiding property without lowering the whiteness thereof, so that a good color can be expressed without decreasing the saturation. When the L * value (brightness index) of the aluminum metal piece is 76 or more, the above effect becomes more reliable.

[0029]

EXAMPLES The present invention will be specifically described by showing Examples and Comparative Examples below. The present invention is not limited to the following examples.

(Examples 1 to 4, Comparative Examples 1 to 3) 1. Production of colored film (soft vinyl chloride resin film) Vinyl chloride resin (“PSH-10” manufactured by Kaneka Corporation) 10
0 parts by weight, polyester-based plasticizer ("P-3 manufactured by Asahi Denka Co., Ltd."
00 "), 30 parts by weight, yellow pigment (" VT- manufactured by Dainichiseika Co., Ltd. "
6420 ") 4 parts by weight, heat stabilizer (" MAR manufactured by Asahi Denka Co., Ltd. "
K AR551 ") 5 parts by weight and a UV absorber (Sumitomo Chemical Co., Ltd." Sumithorpe 140 ") 1 part by weight, and 60 parts by weight of a mixed solvent consisting of petroleum stream (Exxon Chemical Co., Ltd." Solvesso 100 "). The resulting vinyl chloride resin organosol was dispersed in a mold and was cast by a casting method to give a total light transmittance of 50% and a thickness of 50 μm.
A colored film of m was obtained.

2. Preparation of white adhesive solution Base polymer of acrylic adhesive (Skenken Chemical Co., Ltd.
K1335 ", solid content 35% by weight), 5 parts by weight of a curing agent (" M-5A "manufactured by Soken Chemical Co., Ltd.) was added to 100 parts by weight of white pigment, and the weight of the white pigment and paste-like aluminum shown in Table 1 were further added. A metal piece was added and stirred with a dissolver to obtain a white adhesive solution.

3. Preparation of decorative pressure-sensitive adhesive sheet The white pressure-sensitive adhesive solution obtained as described above was coated on release paper having polyethylene films laminated on both sides of high-quality paper and dried to form a pressure-sensitive adhesive layer having a thickness of 30 μm. The pressure-sensitive adhesive layer and the colored film (soft vinyl chloride resin film) obtained above were laminated under heating at 40 ° C. to obtain a decorative pressure-sensitive adhesive sheet with release paper.

The following evaluations were performed on the above-mentioned examples and comparative examples. <Whiteness> The release paper of the obtained decorative adhesive sheet with release paper was peeled off, and the whiteness of the surface of the adhesive layer was measured according to JIS Z 8
It was measured by the method of 715. <Hiding property> The total light transmittances of the single layers of the pressure-sensitive adhesive layer produced in the above Examples and Comparative Examples are JIS K 7
It was measured by the method of 105. <Appearance Evaluation 1> In the above Examples and Comparative Examples, when laminating the pressure-sensitive adhesive layer and the colored film (soft vinyl chloride resin film), the change in saturation on the colored film surface before and after lamination was visually observed, The following criteria were evaluated. ◯: Saturation improved Δ: No change X: Saturation decreased <Appearance evaluation 2> The release paper of the obtained decorative pressure-sensitive adhesive sheet with release paper was peeled off and stuck on a black film, and the colored film of the decorative pressure-sensitive adhesive sheet The change in color on the surface was visually observed and evaluated according to the following criteria. ○: No change in color △: Color slightly changed due to the influence of the base (black film) ×: Significant change due to the influence of the base (black film)

[0034]

[Table 1]

As is clear from Table 1, in the examples of the present invention, it was revealed that good whiteness and concealing property were developed, the chroma was improved, and the appearance of the base material was small and the influence of the base material was small. did.

[0036]

The decorative pressure-sensitive adhesive sheet of the present invention comprises a colored film having a total light transmittance of 3 to 80% and a pressure-sensitive adhesive containing a specific amount of white pigment and aluminum metal pieces laminated on one side. Therefore, even if it is a decorative pressure-sensitive adhesive sheet using a colored film, it exhibits good saturation and hiding power, and the decorative pattern has a uniform appearance because the influence of the color pattern of the adherend is small. Sheets can be provided. From this, the decorative pressure-sensitive adhesive sheet of the present invention does not need to have a multi-layered film for improving saturation as in the conventional case, and the thickness of the obtained sheet can be reduced, so that the workability is good. In addition, it is possible to provide a decorative pressure-sensitive adhesive sheet that has a simple manufacturing process and is inexpensive. When the L * value (brightness index) of the aluminum metal piece is 76 or more, the above effect becomes more reliable.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C09J 11/00 C09J 11/00 201/00 201/00 F term (reference) 4F100 AB10B AK01A AK01B AK15 AK25 AL05B BA02 CA13B CB05B DE05B GB07 HB00A JL10A JL13B JN02 JN08A JN21 4J004 AA18 AA19 AB01 4J040 HA066 JA09 JB09 KA35

Claims (2)

[Claims] 1. A white pigment of 3 to 50 parts by weight relative to 100 parts by weight of a base polymer of an adhesive, and a white pigment addition amount of 0.1% on one side of a colored film having a total light transmittance of 3 to 80%. A pressure-sensitive adhesive sheet for decoration, comprising a pressure-sensitive adhesive containing 3 to 2% by weight of aluminum metal pieces laminated. 2. The L * value (brightness index) of the aluminum metal piece is 7
6. The decorative pressure-sensitive adhesive sheet according to claim 1, which is 6 or more.