JP2006274055A - Method for producing roll-like double-sided adhesive tape and roll-like double-sided adhesive tape - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tape which does not cause a tunnel phenomenon, and is optimal for processing works such as a punching work, even when a polyethylene terephthalate (PET) substrate is used. <P>SOLUTION: This method for producing a roll-like double-sided adhesive tape comprises a process for coating an adhesive on the mold release side of mold release paper prepared by applying a mold release treatment to at least one side polyolefin resin layer of paper having polyolefin resin layers laminated to both the sides of the paper, drying the coated adhesive to form the first adhesive layer, and then laminating the first adhesive layer to a substrate comprising a polyethylene terephthalate (PET) film having a thickness of 10 to 120 μm to form a constituent; and a process for coating an adhesive on the mold release side of mold release paper prepared by applying a mold release treatment to at least one side polyolefin resin layer of paper having polyolefin resin layers laminated to both the sides of the paper, drying the coated adhesive to form the second adhesive layer, and then rolling the produced double-sided adhesive tape. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a structure and a manufacturing method of a double-sided pressure-sensitive adhesive tape provided with release paper on both sides, which is free from tunneling phenomenon, whiskers, release paper float and curl after punching, and further free from tearing of the release paper.

  The double-sided pressure-sensitive adhesive tape includes, for example, a first pressure-sensitive adhesive layer provided on the release surface of the release paper, and a second pressure-sensitive adhesive layer on the release paper in a structure formed by laminating a base material. The base material and the second pressure-sensitive adhesive layer are bonded to each other to form a double-sided pressure-sensitive adhesive tape having release paper on both sides, and the belt-like double-sided pressure-sensitive adhesive tape is wound up into a roll shape, can get.

  In the conventional technique, when a release paper is provided on both sides and wound, especially when the tape is thick and a hard film such as PET is used as a base material, the release paper floats during secondary processing, so-called tunneling. The phenomenon occurs. As a solution to that problem, Patent Document 1 discloses a method of applying a pressure-sensitive adhesive to the release surface of a single-sided release paper, drying the pressure-sensitive adhesive, and taking a curl countermeasure by adjusting the moisture content during winding. It has been. However, when the above-mentioned product is punched, the paper fibers used for the core material of the release paper called so-called beard may pop out. Depending on the application, this mustache can be mixed into the final product and cause problems. This problem is particularly likely to occur when used as a spacer for film switches, film electrodes, switch panels and the like.

Also, generally, when a polyolefin resin is laminated on both sides and the release paper whose surface is release-treated is wound with the double-sided tape provided on both sides, the release paper floats from the tape and a so-called tunnel phenomenon may occur. Many. This phenomenon frequently occurs when the tape is thick and a core material having low flexibility such as PET is used. In order to suppress the tunnel phenomenon, it is effective in manufacturing to increase the adhesion between the release paper and the adhesive tape, but when the adhesion is increased, when removing the release paper after processing such as punching, There is a problem that the release paper is easily broken.
Japanese Examined Patent Publication No. 7-110931

  The present invention is intended to solve the above-described conventional problems, and provides a tape optimal for processing operations such as punching without causing a tunnel phenomenon even when a polyethylene terephthalate (PET) base material is used. Objective.

  In the first aspect of the invention, the first pressure-sensitive adhesive is obtained by applying a pressure-sensitive adhesive to the release surface of a release paper in which polyolefin resin is laminated on both surfaces and at least one surface of the polyolefin resin is release-treated, and drying. After forming the layer, the step of laminating on a substrate made of a polyethylene terephthalate (PET) film having a thickness of 10 to 120 μm to form a structure; a polyolefin resin is laminated on both sides, and at least on the surface of one side of the polyolefin resin Applying the pressure-sensitive adhesive to the release surface of the release paper that has been subjected to the mold release treatment, forming a second pressure-sensitive adhesive layer by drying, laminating on the substrate side of the structure, and winding the roll It is a manufacturing method of a double-sided adhesive tape.

  The invention according to claim 2 is characterized in that the release paper peeling force when the release paper is peeled off from the double-sided pressure-sensitive adhesive tape is 0.98 N / 50 mm or less. It is an adhesive tape.

  The invention according to claim 3 is the roll-shaped double-sided pressure-sensitive adhesive tape according to claim 2, wherein the release paper is kulpack paper.

  The method for producing a roll-type double-sided pressure-sensitive adhesive tape of the present invention comprises laminating a polyolefin resin on both surfaces, applying a pressure-sensitive adhesive on the release paper 1 subjected to a release treatment on the surface, and drying the first pressure-sensitive adhesive. The first step of forming the layer 2 and laminating it on the PET base material 3 to produce the constituent body 6 and the constituent body 7 obtained in the same manner as the first step except for laminating with the PET base material 3 It laminates on the base material of the structure 6 obtained at the 1st process, and forms the double-sided adhesive tape original fabric 8. FIG.

  The original double-sided adhesive tape 8 is passed through each necessary minimum roll, and cut into a desired width and winding length to produce a product. As described above, the above-mentioned roll-shaped double-sided pressure-sensitive adhesive tape 12 is obtained.

The release paper 1 and the release paper 5 are release papers which are laminated with polyolefin resin on both sides and subjected to a release treatment. As the base paper of the release paper, for example, kraft paper, glassine paper, high quality paper is used, polyolefin resin is laminated on the surface, clay coat is applied, and the release agent is applied on the surface. Those are preferred. The basis weight of the release agent is not particularly limited, but is preferably 50 to 250 g / m ² . Further, the release agent is not particularly limited, but, for example, a silicone release agent is preferable, and is appropriately selected depending on the combination with the pressure-sensitive adhesive so as to achieve a target peeling force. The release force of the release paper is preferably 0.98 N / 50 mm or less in order to remove the release paper later, and 0.098 N / 50 mm or more is preferable in order not to cause a tunneling phenomenon.

  The use of the Kurpack paper as the base paper of the release paper 1 and the release paper 5 is effective for the good dispersion of bubbles generated after the winding curing, and for removing a large accumulation of bubbles in part. .

  Although it does not specifically limit as an adhesive which comprises the 1st adhesive layer 2 and the 2nd adhesive layer 4, A rubber type and an acrylic adhesive are used preferably. These pressure-sensitive adhesives are used as a solvent type, a hot melt type, and an emulsion type. The pressure-sensitive adhesives constituting the first pressure-sensitive adhesive layer 2 and the second pressure-sensitive adhesive layer 4 may be the same or different.

  Polyethylene terephthalate (PET) is used for the base material 3, and the thickness of the PET is 10 to 120 μm. As a result, it is possible to prevent the occurrence of problems such as a tunnel phenomenon and release paper floating.

As a method for applying the pressure-sensitive adhesive on the release paper 1 and the release paper 5, known application methods such as comma coating, reverse coating, lip coating, and die coating are used. The coating amount of the release paper of the adhesive is not particularly limited, is preferably ^10g / ^{m 2 ~100g} / m 2 in a dry state on one side, more preferably ^10g / ^{m 2 ~75g} / m 2 is there.

  When a second pressure-sensitive adhesive layer 4 is formed by applying a pressure-sensitive adhesive to the release surface of the release paper and drying, and laminating on the base material side of the configuration 6, and when winding the obtained double-sided pressure-sensitive adhesive tape original 8 It is necessary to adjust the tension at the time of winding so that the double-sided pressure-sensitive adhesive tape does not cause defects such as a winding nest and curl after unfolding. In this way, the roll-shaped double-sided pressure-sensitive adhesive tape 11 can be manufactured.

  The roll-shaped double-sided pressure-sensitive adhesive tape 11 obtained by the method for producing a roll-shaped double-sided pressure-sensitive adhesive tape of the present invention is cut into a desired width and winding length to obtain a desired roll-shaped double-sided pressure-sensitive adhesive tape 12. The roll-shaped double-sided pressure-sensitive adhesive tape 12 is further developed, cut and punched and used as a double-sided pressure-sensitive adhesive tape.

  In the present invention, a roll-shaped double-sided pressure-sensitive adhesive tape is produced using a specific release paper, a release agent, a pressure-sensitive adhesive, and a base material made of 10-120 μm polyethylene terephthalate (PET) film. Tunneling phenomenon, release paper floating, whiskers and curls are reduced when secondary processing such as is performed, and furthermore, the release force is adjusted by combining release agents and adhesives, and problems such as tearing of release paper However, the reduced double-sided adhesive tape can be provided.

  Furthermore, when the double-sided adhesive tape is peeled from the release paper, the release paper peeling force is set to 0.98 N / 50 mm or less, and the release paper is made of kurpack paper to perform secondary processing such as slitting and punching. Thus, it is possible to provide a double-sided pressure-sensitive adhesive tape in which problems such as a tunnel phenomenon, release paper floating, whiskers, curls, and release paper tearing are further reduced.

(Example)
The present invention will be described below based on examples.
The release paper peeling force and the tunnel phenomenon refer to the following.
(1) Release paper peeling force: Release the release paper of the double-sided adhesive tape sample placed in an atmosphere of 23 ° C x 65RH% for at least 2 hours from the tape at an angle of 180 degrees. Power.
(2) Tunneling phenomenon: Phenomenon in which the release paper of double-sided adhesive tape floats linearly from the tape

Example 1
As the release paper 1, a release paper is used in which a polyolefin resin is laminated on the Kurpack paper and a combination of a silicone-based release agent is applied so that the release paper peeling force is 0.294 N / 50 mm in combination with an adhesive. It was. The pressure-sensitive adhesive was applied to the release paper so as to have a thickness of 30 μm after drying, and a PET film having a thickness of 100 μm was bonded to obtain a structure 6. Next, the same release paper as described above was applied in the same manner as the release paper 5, and a pressure sensitive adhesive was applied on the base material side of the structure 6 to obtain a roll-shaped double-sided pressure-sensitive adhesive tape raw material 8. Slit processing was performed to obtain a roll-shaped double-sided adhesive tape.

(Example 2)
A roll-shaped double-sided pressure-sensitive adhesive tape was produced in the same manner as in Example 1 except that the release paper 1 and the release paper 5 were made from high-quality paper from Kurpack paper, and slit-processed to obtain a roll-shaped double-sided pressure-sensitive adhesive tape.

(Example 3)
A roll-shaped double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that the silicone release agent and the pressure-sensitive adhesive were adjusted so that the release paper peeling force of the release paper 1 and the release paper 5 was 1.08 N / 50 mm. .

(Comparative Example 1)
A roll-shaped double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that the thickness of PET was 125 μm.

(Comparative Example 2)
A roll double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that a polyolefin resin was laminated only on one side of release paper 1 and release paper 5 and a silicone release agent was applied thereon.

(Comparative Example 3)
A double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that the release paper of Example 1 was the release paper 1 and the release paper of Comparative Example 2 was the release paper 5.

  The roll-shaped double-sided pressure-sensitive adhesive tape obtained in Example 1 to Comparative Example 3 was slit into a size of 200 mm width and length of 300 m, and it was confirmed by visual observation that there was no tunnel phenomenon, release paper floating, or the like.

  A sample is cut out from this slit double-sided adhesive tape into a 150mm x 150mm rectangle, and the inside is punched into four squares at equal intervals in the vertical and horizontal directions. It was confirmed. Further, the release paper was quickly peeled from the processed product by hand, and it was visually confirmed whether the release paper was torn.

  As can be seen from Table 1, the roll-type double-sided adhesive tapes produced by the methods of Examples 1 and 2 of the present invention cause tunnel phenomenon, release paper floating, whiskers, curls, and tearing of the release paper after punching. Absent. On the other hand, the roll-shaped double-sided pressure-sensitive adhesive tapes shown in Comparative Examples 1 to 3 cause phenomena that cause problems when the double-sided pressure-sensitive adhesive tape is used, such as tunnel phenomenon, release paper floating, whiskers, and curls. In Example 3, the tunnel phenomenon, release paper floating, whiskers, curls, etc. were not observed, but the release paper was torn.

It is a figure for demonstrating the manufacturing method of the roll-shaped double-sided adhesive tape made based on this invention, (a) is a figure which winds up the structure 6 made based on this invention. (B) is a partial cross-sectional view of the structure 6. In the figure for demonstrating the manufacturing method of the roll-shaped double-sided adhesive tape made based on this invention, (a) is a figure which winds up what laminated the structure 6 on the 2nd adhesive layer, (b) The figure which bonds the structure 6 made based on this invention to a 2nd adhesive layer. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure for demonstrating the manufacturing method of the roll-shaped double-sided adhesive tape made based on this invention, (a) unwinds the roll-shaped double-sided adhesive tape made based on this invention, and the roll shape by which the cutting process was carried out The figure (b) which winds up a double-sided adhesive tape is a partial cross section figure of a roll-shaped double-sided adhesive tape. (C) is a figure which winds up the roll-shaped double-sided adhesive tape by which the cutting process was carried out.

Explanation of symbols

1: Release paper 2: First pressure-sensitive adhesive layer 3: Base material 4: Second pressure-sensitive adhesive layer 5: Release paper 6: Constituent body 7: Constituent body 8: Double-sided adhesive tape original fabric 9: Roll-shaped constituent body 10: Roll -Shaped double-sided pressure-sensitive adhesive tape 11: Roll-shaped double-sided pressure-sensitive adhesive tape 12: Roll-shaped double-sided pressure-sensitive adhesive tape (slit-processed)

Claims (3)

  After the first pressure-sensitive adhesive layer is formed by applying a pressure-sensitive adhesive to the release surface of the release paper on which polyolefin resin is laminated on both sides and at least releasing the surface of the polyolefin resin on one side and drying it, A step of laminating on a substrate made of a polyethylene terephthalate (PET) film having a thickness of 10 to 120 μm to form a structure; a release paper in which a polyolefin resin is laminated on both sides and at least one surface of the polyolefin resin is subjected to a release treatment A method for producing a roll-type double-sided pressure-sensitive adhesive tape comprising: applying a pressure-sensitive adhesive to the release surface of the material and drying to form a second pressure-sensitive adhesive layer, laminating and winding on the substrate side of the structure.   The roll-shaped double-sided pressure-sensitive adhesive tape produced by the production method according to claim 1, wherein the release paper peeling force when peeling the release paper from the double-sided pressure-sensitive adhesive tape is 0.98 N / 50 mm or less. The roll-shaped double-sided pressure-sensitive adhesive tape according to claim 2, wherein the release paper is Kurpac paper.

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