JPH0485383A - Pressure-sensitive adhesive sheet with multicolor pattern and preparation thereof - Google Patents

Abstract

PURPOSE:To obtain the title sheet at a low cost without using heat by coating one side of a plastic film with pressure-sensitive inks in a multicolor pattern by a specific procedure and protecting the side coated with the inks with a release paper. CONSTITUTION:A pressure-sensitive ink 2' is applied on one side of a release paper 3' in a given patterning position and then dried. The coated side is stuck to a transparent plastic film 1 and then the release paper 3' is released. Another pressure sensitive adhesive ink 2'' is applied on one side of another release paper 3'' in a given patterning position and then dried. The obtained surface of the pressure sensitive ink 2'' is stuck properly in a given position on the formerly obtained surface of the pressure sensitive ink 2', and this procedure is repeated in succession to pile up the inks as a multicolor pattern. Further, as occasion demands, the release paper 3'' used in the last step is released, and a transparent pressure sensitive adhesive 4 is applied on a further release paper 3 and then dried. Thereafter, the surface of the adhesive 4 is stuck on the surface of the multicolor pattern. Thus, the title sheet is obtained.

Description

[Detailed Description of the Invention] U Industrial Field of Application 1 The present invention can be used in the same way as general adhesive products, such as adhesive labels with release paper, stickers, etc., and can be used as a multicolor patterned product that can freely exhibit functions tailored to the application. This invention relates to a pressure-sensitive adhesive sheet.

[Prior Art] Pressure-sensitive adhesive sheets used as base materials for adhesive labels and stickers have excellent printing effects for multicolored characters and figures (i.e., patterns), and at the same time, they are environmentally friendly after they are used. Durability is often required depending on the conditions. One of the countermeasures is to use a pressure-sensitive adhesive sheet that uses transparent plastic that is durable in the specified environment, prints a pattern on one side, and then processes the printed surface with pressure-sensitive adhesive.
It is common knowledge to use a so-called back-printing colored pressure-sensitive adhesive sheet or patterned pressure-sensitive adhesive sheet. This ensures that the pressure-sensitive adhesive labels and stickers exhibit the durability of their transparent plastic surface, and that the printed and pressure-sensitive adhesive surfaces are shielded and protected from environmental conditions by the plastic. will be done.

However, among the plastics that can be used as surface base materials, there are many types, including those that are thin and have low tensile strength, and those that cannot be directly printed due to poor solvent resistance. For example, examples of materials that are thin and have low tensile strength include polyvinyl chloride, polyvinylidene dipropylene, polyethylene, polypropylene, polyvinyl alcohol, cellophane, acetate, polyester, fluorine, urethane, polystyrene, and polycarbonate. Examples of materials with poor solvent resistance include polyvinyl chloride, polyvinylidene chloride, polyacrylate, polycarbonate, polystyrene, and polyurethane.

In order to print on such a base material without causing any defects, special means can be considered, such as printing on processing paper (film) in advance and then transferring it to the surface base material using heat.

[Problems to be Solved by the Invention] In order to print on plastic films with low strength or poor solvent resistance, a method such as printing on process paper (film) in advance and transferring it using heat as described above is used. If you choose to do so, you will encounter the following difficulties.

The first difficulty is that when printing on process paper (film), unless you carefully select and consider the relationship between the type of ink, viscosity, printing method, type of release treatment for process paper (film), etc.
It is easy to cause problems such as ink repellency, blurring, and poor transfer.

The second difficulty is that the above thermal transfer method requires the plastic film itself to have heat resistance, thermal dimensional stability, etc. Without heat resistance and thermal dimensional stability, the film will have significant defects in appearance such as wrinkles, shrinkage, or distortion of the printed pattern due to partial shrinkage during thermal transfer, which will impair commercial value. In addition, since such processing paper (film) is for special purposes, it has disadvantages in terms of cost, making it impractical.

The present invention was made with the aim of solving the above-mentioned problems in producing multicolor patterned pressure-sensitive adhesive sheets, and in particular does not use heat and eliminates the many disadvantages seen in thermal transfer methods. The purpose of the present invention is to provide a method that can be manufactured at low cost using a conventional method for general pressure-sensitive adhesives without causing any problems.

[Means for Solving the Problems] In order to achieve the above object, in the manufacturing process of the multicolor patterned pressure-sensitive adhesive sort of the present invention, a transparent plastic film is used as the surface base material, and one side of the multicolor A unique method was used in which pressure-sensitive adhesive ink was applied once or in several parts in a pattern, and the ink-coated surface was further protected with release paper.

The structure and manufacturing method of the multicolor patterned pressure-sensitive adhesive sheet of the present invention will be explained below with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing the structure of a multicolor patterned pressure-sensitive adhesive tape according to the present invention. That is, on the back side of the transparent plastic film 1, which is the surface base material, there is a pressure-sensitive adhesive ink layer 2° with a multicolor pattern;
A coloring layer consisting of 2″11. A release paper 3 is attached to the holder.

The pressure-sensitive adhesive ink used in the pressure-sensitive adhesive sheet of the present invention is a pressure-sensitive adhesive ink in which a pressure-sensitive adhesive is used as a binder and colorants such as dyes/pigments, metallic powders, and burl powders are dispersed or dissolved. It was used.

If the amount of these colorants is too large, it may not function as a pressure-sensitive adhesive, so it is necessary to provide a transparent pressure-sensitive adhesive layer 4 to ensure adhesion to the adherend. However, when the amount of colorant is small, the function as a pressure-sensitive adhesive is fully expressed, so the transparent pressure-sensitive adhesive layer 4
can be omitted.

Generally, any commonly used material can be used for the transparent plastic film 1 used as the surface base material, but for applications where weather resistance is particularly important, fluorine, polyurethane, polyacrylic, polycarbonate, weather-resistant polyvinyl chloride, weather-resistant polyester, etc. are used. A plastic film with weather resistance functionality can be used. Furthermore, for applications where stain resistance and chemical resistance are important, fluorine, polyurethane, etc. are preferable.

Other films can also be freely selected in consideration of functionality and cost.

The pressure-sensitive adhesive that serves as the binder for the pressure-sensitive adhesive ink may be any pressure-sensitive adhesive that can be colored, such as rubber-based or silicone-based adhesives, but acrylic-based pressure-sensitive adhesives are preferable in terms of weather resistance and durability. The acrylic pressure-sensitive adhesive is preferably an ester of acrylic acid or methacrylic acid having an alkyl group having 2 to 12 carbon atoms, and specifically, ethyl acrylate, which belongs to the family of acrylic esters, Isononyl acrylate, lauryl acrylate, etc., and methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, innonyl methacrylate, which belong to the methacrylic acid ester family.
Examples include lauryl methacrylate. These monomers are usually used in one or more types to produce solvent-type or emulsion-type acrylic pressure-sensitive adhesives by solution polymerization, emulsion polymerization, etc. is also available.

In addition, the dyes and pigments, metallic powders, bar powders, etc. used are either organic solvent-soluble or water-soluble, depending on the base solvent type, emulsion type, and type of pressure-sensitive adhesive. , one or more types are used depending on the color. Also,
The mixing ratio of the pressure-sensitive adhesive, dyes and pigments, metallic powder, burl powder, etc. is 100°0. It is suitable that it is within the range of O1 to 100.

The thickness of the colored pressure-sensitive adhesive ink layer is about 5 to 10
It is desirable that it be 0μ.

As the release paper 3 to be used, any release paper that protects the pressure-sensitive adhesive surface of the pressure-sensitive adhesive sheet can be used. Also included.

FIG. 2 is a schematic cross-sectional view showing the manufacturing method of the same sheet according to the steps from ① to ②, and particularly illustrates the case of two-color printing.

First, a pressure-sensitive adhesive ink is applied in a pattern onto the release paper 3' by a conventional method and dried to form a pressure-sensitive adhesive ink layer 2° (step 2). Next, a plastic film 1', which is a surface base material, is attached to this coated surface by a conventional method at room temperature (Step 2). Furthermore, a predetermined pressure-sensitive adhesive ink is applied to a separately prepared release paper surface 3'' according to the pattern planned for use in the second color printing, and dried in the same manner as in step (2) to form a second pressure-sensitive adhesive ink layer 2. After step (■) to form ", remove the release paper 3 degrees from the members laminated in step (■), and place the ink-coated surface obtained in step (■) at the predetermined imprinting position on the plastic film surface. Align and paste correctly (Step ■). The above two-color printing process has been completed, but when performing multi-color printing, pressure-sensitive adhesive ink layers are laminated by repeating steps 1, 2 and 3 many times (step 2). When the amount of colorant in the pressure-sensitive adhesive ink is small, the final laminate obtained in this way is used as the finished product of this process, but due to reasons such as a large amount of colorant, the pressure-sensitive adhesive If it is difficult to function as an adhesive, peel off the release paper 3'' from the final laminate (Step ■), and separately form a transparent pressure-sensitive adhesive layer 4 on the release paper 3 (Step ■). The finished product of this process is made by pasting it on the surface coated with pressure-sensitive adhesive ink that was exposed in step (■).
Process ■).

In the above manufacturing process of the multicolor patterned pressure-sensitive adhesive sheet, there are no particular limitations on the method of coating the release paper with the pressure-sensitive adhesive, which is the binder of the pressure-sensitive adhesive ink, and the coating machine. Instead, any material that can be coated in a pattern may be used, and partial coating is also possible using a printing method. Specifically, letterpress printing, planographic printing, gravure printing, engraving intaglio printing, silk screen printing, rotary silk screen printing, and flexo printing can be used.

E Examples and Comparative Examples Example 1 Step ■→■; Release paper (manufactured by Fujimori Industries Co., Ltd., trade name 8゜h)
b-018), acrylic pressure-sensitive adhesive (butyl acrylate 45% by weight, 5% 2-ethylhexyl acrylate)
A red pigment (manufactured by Dainichiseika Co., Ltd., trade name: Dymic) was added to 100 parts of an ethyl acetate solution of a copolymer (solid content concentration: 40% by weight) consisting of 0% by weight and 5% by weight of acrylic acid. Add 30 parts by weight and stir thoroughly using a ball mill.
The dispersed pressure-sensitive adhesive ink was applied in stripes using a knife coater, dried with hot air at 80°C for 5 minutes,
A striped pressure-sensitive adhesive ink layer with a thickness of 30μ was completed, and a fluorine-based film with a thickness of 25μ (Daikin Industries, Ltd.) was completed.
(Product name: Fu-Fron).

Step ■→■→■: Add 30.5 parts by weight each of white and blue pigments (Dainichiseika Co., Ltd., trade name: Dymic) to 100 parts by weight of the acrylic pressure-sensitive adhesive to the release paper. Then, the pressure-sensitive adhesive ink obtained in the same manner as above was applied in the form of stripes, dried, and while peeling off the release paper in step (2), the ink in step (2) was applied to the uncoated part of the stripe in the same step. They were pasted together so that the coated parts were facing together, and a pressure-sensitive adhesive sheet with a multicolor pattern in the form of red and blue stripes was completed.

Example 2 Step ■→■→■: Separately from Example 1, using the same release paper as Example 1, apply the same pressure sensitive adhesive as Example 1 without adding pigment in a solid state, and dry. A transparent pressure sensitive adhesive layer was formed. Next, while peeling off the release paper of the pressure-sensitive adhesive sheet completed in step (2) of the above example, the transparent pressure-sensitive adhesive layer obtained in this step (2) was bonded thereto to form a multicolor patterned pressure-sensitive adhesive. Completed the sex sheet.

[Effects of the Invention] Since the present invention is configured as described above, it produces the effects described below.

In the manufacturing method of claim 1, the plastic film itself as the surface base material is made of a material that is technically difficult to color, a material that is technically colorable but extremely costly, a material whose surface properties are impaired by coloring, Alternatively, you can freely and inexpensively create colored or multicolored patterned pressure-sensitive adhesive sheets for materials whose surface base material itself does not have sufficient strength or which cannot be used for general printing due to poor solvent resistance. , can be expected to be applied in a wide range of industrial fields.

In the multicolor patterned pressure-sensitive adhesive sheet of claim 2, the multicolor patterned pressure sensitive adhesive sheet can be directly printed on a common surface substrate. The base material shields and protects the printed surface and adhesive surface from these environmental conditions, so durability can be expected.

[Brief explanation of drawings]

Fig. 1 is a schematic cross-sectional view showing the structure of the multicolor patterned pressure-sensitive adhesive sheet of the present invention, and Fig. 2 is a schematic cross-sectional view showing the manufacturing method of the same sheet according to the steps from ■ to ■, especially in the case of two-color printing. This is an example of 109. Plastic film 2, 2', 2'', pressure-sensitive adhesive ink layer 3, 3',
3”90. Release paper 41. Transparent pressure sensitive adhesive layer

Claims (1)

[Claims] 1. A transparent plastic film is used as the surface base material, pressure-sensitive adhesive ink is applied once or several times in a multicolor pattern on one side, and then the pressure-sensitive adhesive ink is coated with release paper. A method for manufacturing a multicolor patterned pressure-sensitive adhesive sheet with a coated surface protected, comprising: (1) a step of applying pressure-sensitive adhesive ink to a release paper surface at a predetermined pattern position and drying; ) bonding the surface coated with the pressure-sensitive adhesive ink with a transparent plastic film; (3) peeling off the release paper; (4) applying a pressure-sensitive adhesive ink different from the above. Applying the pressure-sensitive adhesive ink obtained in step (4) on the pressure-sensitive adhesive ink obtained in steps (1) to (3) above, applying the pressure-sensitive adhesive ink obtained in steps (1) to (3) above to the surface of the release paper in a predetermined pattern position and drying. (6) Further, a step of repeating the steps (3) to (5) one after another to form a multicolor printing pattern, and further as necessary. (7) Peeling off the release paper used in the last step, (8) Applying a transparent pressure-sensitive adhesive to a separate release paper and drying it, (9) A method for producing a multicolor patterned pressure-sensitive adhesive sheet, comprising the step of attaching the adhesive coated surface obtained in (8) to the multicolor printed pattern surface obtained in (7). 2. A multicolored patterned pressure-sensitive adhesive sheet produced by the method according to claim 1.