JPH08157790A - Production of pressure-sensitive adhesive tape with cast film as base material - Google Patents

Abstract

PURPOSE: To prepare a pressure-sensitive adhesive tape without using any unnecessary process paper in the course of production thereof by forming a cast film on one surface of a release paper having release properties on both surfaces thereof, forming a pressure-sensitive adhesive layer on the other surface of the release paper, and winding up the resultant laminate into the form of a roll. CONSTITUTION: One surface of a release paper 1 having release properties on both surfaces thereof is coated with an organosol of a vinyl chloride resin, and the coated release paper is then passed through a drying chamber 2 to form a cast film on the release paper, which is then wound up into the form of a roll to obtain a cast film 3 with a release paper. The other surface of the film 3 is coated with a soln. of a pressure-sensitive adhesive, and the film thus coated is then passed and dried through a drying chamber 4 to obtain a pressure-sensitive adhesive tape 5, which is then wound up into the form of a roll.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an adhesive tape using a cast film as a base material. This type of adhesive tape is used, for example, for medical purposes, industrial purposes, packaging, marking, and the like.

[0002]

2. Description of the Related Art Conventionally, as a method for producing an adhesive tape using a cast film as a base material, there has been one shown in FIGS.

In the method shown in FIG. 5, first, as shown in FIG. 5 (a), a casting liquid is applied to the peeling surface of a process paper 51 having a peelable surface on one side, and then this is passed through a drying chamber 52. After forming the casting film on the release surface, cast film with process paper 53
Only the casting film 54 is wound into a roll while the process paper 51 is peeled off. Thereafter, as shown in FIG. 5B, an adhesive solution is applied to the release surface of a release paper (hereinafter abbreviated as single-sided release paper) 55 having a release property on one side, which is then placed in a drying chamber 52. After forming a pressure-sensitive adhesive layer on the release surface by passing it, the casting film 54 is brought into close contact with the pressure-sensitive adhesive layer of the release paper 56 with a pressure-sensitive adhesive layer, and the obtained pressure-sensitive adhesive tape 57 is rolled up.

In the method shown in FIG. 6, first, as shown in FIG.
As shown in FIG. 1, one side is coated with a casting solution on the release surface of the process paper 51 having peelability, and then this is passed through the drying chamber 52 to form a casting film on the release surface, and then the process paper is attached. The casting film 53 is rolled up. After that, as shown in FIG. 6B, an adhesive solution is applied to the release surface of the single-sided release paper 55,
Then, after passing this through the drying chamber 52 to form an adhesive layer on the release surface, the adhesive layer of the release paper 56 with the adhesive layer is brought into close contact with the film surface of the casting film 53 with the above process paper, and then The adhesive tape 57 thus obtained is wound into a roll while the process paper 51 is peeled off.

[0005]

However, the above-mentioned method requires two kinds of process paper for casting and release paper for adhesive coating in the manufacturing process. Since the process paper is not required, the cost of the process paper is inferior in terms of cost and the process paper has to be peeled off.

In view of the above points, the present invention uses a release paper having two kinds of functions, that is, a process paper for casting and a release paper for pressure-sensitive adhesive coating to reduce the cost and simplify the process. It is an object of the present invention to provide a method for producing an adhesive tape that can achieve the above.

[0007]

DISCLOSURE OF THE INVENTION The present invention provides a release paper having two functions of a process paper for casting and a release paper for pressure-sensitive adhesive coating. Less than,
The above object is achieved by using a double-sided release paper).

That is, the method for producing a pressure-sensitive adhesive tape using a cast film as a base material according to the present invention comprises forming a cast film on one surface of a double-sided release paper and forming a pressure-sensitive adhesive layer on the other surface of the paper. It is characterized in that the pressure-sensitive adhesive layer is brought into close contact with the casting film by winding the obtained laminated body in a roll shape.

As the casting solution, those generally used in the production of cast films can be used, and examples thereof include vinyl chloride resin organosols and urethane resin solutions.

As the adhesive, an acrylic adhesive, a rubber adhesive, a silicone adhesive or the like is used. As the acrylic pressure-sensitive adhesive, particularly, an alkyl group having 1 to 1 carbon atoms
A homopolymer or copolymer of 18 (meth) acrylic acid alkyl ester, or a copolymer of the (meth) acrylic acid alkyl ester and other functional monomer is preferably used.

In particular, an acrylic adhesive solution is preferably used as an adhesive solution for coating.

As the double-sided release paper, the release force between the release paper and the casting film and the release force between the release paper and the adhesive layer are

[0013]

[Formula 1] If the release paper and the casting film have a relationship of <release force of release paper and pressure-sensitive adhesive layer, the release paper will be transferred from the outer layer to the inner layer as shown in FIG. -Adhesive layer 12-A roll of adhesive tape having the structure of the casting film 13 can be obtained.

As the double-sided release paper, the release force between the release paper and the casting film and the release force between the release paper and the pressure-sensitive adhesive layer are

[0015]

[Formula 2] Peeling force between release paper and cast film> Peeling force between release paper and pressure-sensitive adhesive layer If a pressure-sensitive adhesive layer is used, as shown in FIG. 21-Casting film 22
A roll of adhesive tape making up the release paper 23 is obtained.

[0016]

In the manufacturing method of the present invention, the double-sided release paper has two functions of the process paper for casting and the release paper for adhesive coating, and therefore is not a constituent element of the adhesive tape product. The required process paper does not have to be used in the manufacturing process. Therefore, it is possible to achieve cost reduction by the cost of process paper and
The process paper stripping can be eliminated and the process can be simplified.

[0017]

【Example】

Example 1 In FIG. 1 (a), an organosol of vinyl chloride resin (vinyl chloride resin: PSH-10: 100 manufactured by Kanegafuchi Chemical Co., Ltd.)
Parts by weight, polyester-based plasticizer: P manufactured by ADEKA ARGUS
-300: 50 parts by weight, metal-based stabilizer: MARK AP551: 7 parts by weight made by ADEKA ARGUS, solvent: 60 parts by weight Solvesso made by Mitsubishi Petrochemical, epoxy compound: O-130P made by ADEKA ARGUS: 5 parts by weight) Double-sided release paper 1
(Fujimori Kogyo Co., Ltd. 70K-518T) was coated on one side, then passed through a drying chamber 2 to form a casting film with a thickness of 50 μm on the release paper, and then cast with release paper. Film 3 was rolled up.

Thereafter, as shown in FIG. 1 (b), an acrylic adhesive solution (SK-1720, manufactured by Soken Chemical Co., Ltd.) was applied to the other release surface of the film 3 with release paper, and then dried. Cast film with release paper 3 through chamber 4
A pressure-sensitive adhesive layer having a paste thickness of 30 μm was formed on the back surface of the, and the obtained pressure-sensitive adhesive tape 5 was wound into a roll.

As the double-sided release paper, those having a release layer having a release force of 30 g / 25 mm and a release layer having a release force of 60 g / 25 mm were used.

Thus, at the time of expansion, as shown in FIG.
From outer layer to inner layer, release paper 11-adhesive layer 12-cast film
A roll of adhesive tape having 13 constitutions was obtained.

Example 2 In FIG. 2, the same organosol of vinyl chloride resin as used in Example 1 was coated on one side of a double-sided release paper 1 and then passed through the lower part of the drying chamber 2. Then, after forming a casting film having a thickness of 50 μm on the release paper, the same acrylic pressure-sensitive adhesive solution as that used in Example 1 was applied to the other release surface of the obtained film 3 with release paper. Then pass this through the top of Drying Room 2 and cast film with release paper.
After forming an adhesive layer having a paste thickness of 30 μm on the back surface of 3, the obtained adhesive tape 5 was wound into a roll.

Comparative Example 1 In the example, a process paper having a releasability on one side was used as the casting process paper, and the same liquid as that of the example 1 was used as the casting liquid, based on FIG. 6 (a). As described above, the casting liquid is applied to the peeling surface of the process paper 51, which has peelability on one side, and then this is passed through the drying chamber 52 to form a casting film on the peeling surface. Cast film with process paper 53
Was rolled up. After that, as shown in FIG. 6B, an adhesive solution is applied to the release surface of the single-sided release paper 55, and then the adhesive solution is passed through a drying chamber 52 to form an adhesive layer on the release surface. The pressure-sensitive adhesive tape 57 obtained by adhering the film surface of the casting film 53 with process paper to the pressure-sensitive adhesive layer of the release paper with agent layer 56, and then peeling off the process paper 51 from this.
Was rolled up.

As the casting process paper and the one-sided release paper, the peeling force between the casting process paper and the casting film and the peeling force between the one-sided release paper and the adhesive layer are 30 g / 25 mm, respectively.
And 60 g / 25 mm.

Cost Evaluation Regarding the pressure-sensitive adhesive tapes obtained in Example 1 and Comparative Example 1, the costs of the process paper and the release paper required for production were compared. Table 1 shows the results.

[0025]

[Table 1]

[0026]

According to the manufacturing method of the present invention, it is not necessary to use process paper, which is unnecessary as a constituent element of an adhesive tape product, in the manufacturing process. Therefore, the cost can be reduced by the cost of the process paper, and the process paper stripping can be eliminated and the process can be simplified.

[Brief description of drawings]

FIG. 1A and FIG. 1B are process diagrams showing a first embodiment.

FIG. 2 is a process diagram showing a second embodiment.

FIG. 3 is a side view showing a developed state of the adhesive tape.

FIG. 4 is a side view showing a developed state of the adhesive tape.

5A and 5B are process diagrams showing a conventional method.

FIG. 6A and FIG. 6B are process drawings showing a conventional method.

[Explanation of symbols]

 1: Double-sided release paper 2: Drying room 3: Casting film with release paper 4: Drying room 5: Adhesive tape

Claims (1)

[Claims] 1. A pressure-sensitive adhesive film is obtained by forming a casting film on one surface of a release paper having release properties on both sides, forming an adhesive layer on the other surface, and winding the obtained laminate into a roll. A method for producing a pressure-sensitive adhesive tape comprising a casting film as a base material, which comprises bringing the agent layer into close contact with the casting film.