JP2005335214A - Peeling liner, adhesive tape, and their production methods - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a peeling liner and an adhesive tape which are advantageous in terms of costs, equipment, and environment and methods for producing them. <P>SOLUTION: In the peeling liner 3, the cut surface of a film obtained by cutting a polyolefin resin molding 1 is made a mold release surface 3a. In the adhesive tape having an adhesive layer on one surface side of the substrate, the substrate is the film obtained by cutting the polyolefin resin molding, and at least the back of the substrate is made the cut surface. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a release liner made of a polyolefin resin, a pressure-sensitive adhesive tape based on a polyolefin resin, and a method for producing them.

  Conventionally, the sheet | seat which consists of polyolefin resin is used as a base material of the adhesive tape which forms an adhesive layer on it, or as a peeling liner bonded together with an adhesive tape. As a product form thereof, the pressure-sensitive adhesive layer and the polyolefin layer are bonded to each other to be in a close contact state. However, since they are difficult to peel off during use, a release treatment is usually performed on the surface of the polyolefin resin sheet.

  As a method for performing such a release treatment, a method of applying a solvent-type release agent, an emulsion-type release agent, an ionizing radiation-curable release agent, or the like is general. Examples of the release agent to be used include a long-chain alkyl group-containing polymer, a silicone polymer, a perfluoro polymer, and the like (for example, see Non-Patent Document 1).

  However, in order to apply the release agent, a solution obtained by diluting the release agent with a solvent or an aqueous solution obtained by emulsification must be applied. In that case, in order to volatilize the solvent or water, Since large-scale equipment is required, it is disadvantageous in terms of environment and equipment. On the other hand, when using an ionizing radiation curable release agent, the equipment that generates ionizing radiation may be compact, but using the release agent in the first place increases the cost of the product, which is disadvantageous. .

On the other hand, when manufacturing a resin sheet, a method of forming a block-shaped resin molded body in advance and cutting the molded body to obtain a resin sheet is known (for example, see Patent Document 1). However, it has not been known so far that the cutting surface of the resin sheet obtained in this way has excellent releasability.
Japan Adhesive Tape Industry Association "Adhesive Handbook 2nd Edition" published in 1995 Japanese Patent Publication No. 5-66855

  Accordingly, an object of the present invention is to provide a release liner and pressure-sensitive adhesive tape that are advantageous in terms of cost, equipment, and environment, and a method for producing them, because sufficient releasability can be obtained without using a release agent. There is.

  As a result of intensive studies to solve the above problems, the inventors of the present invention have an excellent releasability with respect to the pressure-sensitive adhesive surface of a film formed by cutting a polyolefin resin molded body. As a result, the present invention was completed by further study.

  That is, the release liner of the present invention is characterized in that a cut surface of a film formed by cutting a molded product of polyolefin resin is used as a release surface. According to the release liner of the present invention, the cut surface of the film formed by cutting the molded body has excellent release properties with respect to the pressure-sensitive adhesive, and therefore sufficient release without using a release agent. Sex is obtained. Therefore, it is possible to provide a release liner that is advantageous in terms of cost, equipment, and environment.

  Further, the pressure-sensitive adhesive tape of the present invention is a pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer on one side of the base material, wherein the base material is a film formed by cutting a polyolefin resin molded body, and at least the back surface of the base material is cut. It is characterized by being a machined surface. According to the pressure-sensitive adhesive tape of the present invention, a film formed by cutting a molded product of polyolefin resin is used as a base material, and the back surface thereof is used as a cutting surface. Therefore, sufficient release can be achieved without using a release agent. Since moldability is obtained, an adhesive tape that is advantageous in terms of cost, equipment, and environment can be obtained.

  On the other hand, the method for producing a release liner according to the present invention is characterized in that it includes a step of cutting a polyolefin resin molded body to form a release surface. According to the method for producing a release liner of the present invention, since a release surface is formed by cutting a molded product of a polyolefin resin, a release liner capable of obtaining sufficient release properties without using a release agent is provided. It can be advantageously manufactured in terms of cost, equipment, and environment.

  In the above, it is preferable to continuously form a release surface by cutting with a cutting blade while extruding the molded body. According to this manufacturing method, a release liner having sufficient releasability can be more advantageously manufactured with cost and facilities through a series of steps.

  Further, the method for producing an adhesive tape of the present invention is the method for producing an adhesive tape comprising a step of integrating at least the base material and the adhesive layer, by cutting a polyolefin resin molded body, It has the process of forming a back surface, It is characterized by the above-mentioned. According to the method for producing a pressure-sensitive adhesive tape of the present invention, a polyolefin resin molded body is cut to form the back surface of the base material, so that sufficient releasability can be obtained at the time of use without using a release agent. The adhesive tape can be advantageously produced in terms of cost, equipment, and environment.

  In the above, it is preferable that the integration is performed by co-extrusion molding of the base material and the pressure-sensitive adhesive layer, and the release surface is continuously formed by cutting with a cutting blade. According to this manufacturing method, an adhesive tape having sufficient releasability at the time of use can be more advantageously manufactured by cost and equipment through a series of steps.

  Hereinafter, embodiments of the present invention will be described in the order of a release liner, a manufacturing method thereof, an adhesive tape and a manufacturing method thereof, with reference to the drawings.

[Release liner and manufacturing method thereof]
FIG. 1 is a front view showing an example of a method for producing a release liner of the present invention. As shown in FIG. 1, the method for producing a release liner of the present invention includes a step of cutting a polyolefin resin molded body 1 to form a release surface 3a. In the present embodiment, an example in which the outer periphery of a cylindrical molded body 1 is cut to produce a film-like release liner 3 will be described.

  The polyolefin resin used in the present invention is not particularly limited as long as it contains an olefin monomer as a constituent component. For example, ethylene such as low density, high density, ultra high molecular weight, linear (linear) low density polyethylene, etc. -Based polymers, olefin-based polymers such as ethylene-α-olefin copolymers, ethylene / vinyl acetate copolymers, ethylene-methyl methacrylate copolymers and other olefin-based polymers with other monomers, polypropylene or propylene components Examples thereof include block-based and random-based propylene-based polymers composed of an ethylene component. These polyolefin resins can be used alone or in combination of two or more. Of these, ethylene polymers are preferred because they are excellent in moldability from the viewpoints of moldability and recyclability, and can be obtained with a small amount of additives, resulting in a film with little contamination.

  The molded body 1 contains an olefin resin as a main component, but for the purpose of an anti-degradation agent, for example, a light stabilizer such as an antioxidant, an ultraviolet absorber, a hindered amine light stabilizer, a carbon powder or a conductive material. Substances, antistatic agents such as surfactants, and other additives such as fillers such as calcium oxide, magnesium oxide, silica, zinc oxide, and titanium oxide, pigments, anti-smudge agents, lubricants, antiblocking agents, etc. Can be blended appropriately.

  As a molding method of the molded body 1, any conventionally known olefin resin molding method can be employed, and examples thereof include extrusion molding, compression molding, mold molding, and injection molding. When the cylindrical molded body 1 is used, an inner diameter of about 40 mm and an outer diameter of about 80 mm are preferable, but not particularly limited.

  The cylindrical molded body 1 is mounted on a rotary drive roll 6 and is cut by a cutting blade (blade) 2 disposed on the outer periphery of the molded body 1 while being rotationally driven. The release liner 3 cut to a predetermined thickness passes through the guide roll 4 and is taken up as a roll-like object 3R by the take-up roll 5. Prior to winding, it may be cut to a predetermined width. Further, the type of blade used is not particularly limited.

  The release liner of the present invention that can be produced in this manner is such that the cut surface of a film formed by cutting the molded body 1 of polyolefin resin is the release surface 3a. In the present embodiment, since both surfaces of the release liner are cut surfaces, any of them may be the release surface 3a.

  The thickness of the release liner 3 is not particularly limited, but is usually about 20 to 300 μm, preferably 30 to 250 μm, and more preferably 40 to 200 μm.

  In the cutting process as in the present invention, since dust is not generated, it can be used in a clean environment. According to this method, since a clean release liner can be produced, it can be applied to fields requiring cleanliness, such as optical parts and electronic parts.

[Other Embodiments of Release Liner]
(1) In the above-described embodiment, an example in which the outer periphery of a cylindrical molded body is cut to manufacture a film-like release liner has been shown. However, in the present invention, any shape molded body is used. For example, as shown in FIG. 2, a plate-shaped molded body 1 can be used.

  In this embodiment, the polyolefin resin molded body 1 is cut while moving the plate-shaped molded body 1 relative to the flange 8 provided with the cutting blade 2 to form the release surface 3 a of the release liner 3. To do. The obtained release liner 3 is wound up in the same manner as in the previous embodiment. In this case, since the release liner 3 having substantially the same shape as the shape of the upper surface of the plate-shaped molded body 1 is obtained, a plate-shaped (may be block-shaped) molded body 1 according to the required shape of the release liner 3. Can be molded. When using the plate-shaped molding 1, the thickness is preferably 0.5 mm to 20 mm, and more preferably 1 mm to 10 mm.

  (2) In the above-described embodiment, an example of manufacturing a film-shaped release liner by cutting a previously formed molded body has been shown. However, in the present invention, molding and cutting of the molded body are performed as a series of steps. You may go. For example, as shown in FIG. 3, the mold release surface 3 a may be continuously formed by cutting with the cutting blade 2 while extruding the molded body 1 using the extrusion molding machine 10 including the T die 11. Good.

  More specifically, the sheet extruded from the T-die 11 of the extrusion molding machine 10 is cooled by the cooling unit 12, and the molded body 1 of the cooled sheet is introduced into a cutting device 13 including a cutting blade 2 to obtain two sheets The release liner 3 is cut. At that time, tension is applied to the two release liners 3 on the downstream side by the nip roll 14 provided on the downstream side. The two release liners 3 that have passed through the nip roll 14 are each wound up as two rolls 3R by the two winding rolls 5.

  In the cutting device 13, the sheet is guided so that the cutting blade 2 is arranged at the center of the thickness of the introduced sheet, and is cut (cut) into two sheets by taking the sheet downstream. It has become.

  Moreover, you may use the molded object of the polyolefin resin shape | molded by the inflation method instead of the T-die method. According to the above method, two rolls can be produced in one process, and productivity can be remarkably improved. Moreover, the thickness of each release liner may be the same or different.

  (3) In the above-described embodiment, the example in which the cut surface of the release liner is used as the release surface is shown. However, in the present invention, a step of surface processing the cut surface after cutting may be provided. For example, if a heat treatment is performed with a mirror surface roll, a smooth and glossy release liner appearance can be obtained. Moreover, if it heat-processes with an embossing roll or a sculpture roll, it can also make a dull appearance. According to this method, the appearance of the release liner can be controlled. Here, a known technique can be used for the surface processing method, and there is no particular limitation.

[Adhesive tape and method for producing the same]
FIG. 4 is a front view showing an example of the method for producing the adhesive tape of the present invention. As shown in FIG. 4, the method for producing an adhesive tape of the present invention is a method for producing an adhesive tape 23 having a step of integrating at least a base material 21 and an adhesive layer 22. It has the process of cutting and forming the back surface 21a of the said base material 21. FIG. In the present embodiment, an example in which the outer periphery of the cylindrical molded body 1 is cut to produce the base material 21 and the adhesive layer 22 is applied and formed thereon is shown.

  The same thing as the case of a release liner can be used for the polyolefin-type resin, the molded object 1, etc. which comprise the base material 21. FIG. Moreover, the same thing can be used for the rotational drive roll 6, the cutting blade (blade) 2, etc. FIG.

  In this embodiment, since both surfaces of the base material are cut surfaces, it is preferable to perform an easy adhesion treatment on the surface on which the pressure-sensitive adhesive layer 22 is formed. The easy adhesion process may be a method of forming a primer layer or the like, but in this embodiment, an example of performing the easy adhesion process using the plasma irradiation device 25 is shown.

  Next, the pressure-sensitive adhesive layer 22 is formed on the easy-adhesion treated surface of the substrate 21 by using a coating device 26. Various methods using a die coater, a curtain coater, a roll coater, a blade coater, etc. can be used as the pressure-sensitive adhesive coating method. Any coating method can be adopted.

  The pressure-sensitive adhesive used in the present invention is not particularly limited, and examples thereof include rubber-based, acrylic-based, silicone-based, and urethane-based pressure-sensitive adhesives, preferably rubber-based and more preferably thermoplastic elastomers. The thermoplastic elastomer can be used alone or in combination of two or more.

  When the pressure-sensitive adhesive layer 22 is formed by coextrusion as will be described later, it is preferable to use a thermoplastic elastomer as the pressure-sensitive adhesive. A base polymer of the pressure-sensitive adhesive may be a styrene-based elastomer, urethane-based elastomer, ester-based elastomer, olefin-based elastomer, or the like. What is used as can be used without particular limitation.

  More specifically, styrene / butadiene / styrene (SBS), styrene / isoprene / styrene (SIS), styrene-ethylene-butylene copolymer / styrene (SEBS), styrene / ethylene-propylene copolymer / styrene (SEPS). A-B-A type block polymer such as styrene / butadiene (SB), styrene / isoprene (SI), styrene / ethylene / butylene copolymer (SEB), styrene / ethylene / propylene copolymer (SEP), etc. A-B type block polymer; Styrene random copolymer such as styrene / butadiene rubber (SBR); ABC type styrene / olefin such as styrene / ethylene-butylene copolymer / olefin crystal (SEBC) Crystalline block polymer; Olefin crystal (CEBC) C-B-C type crystalline olefin based block polymers such as; ethylene-alpha-olefin, ethylene-propylene-alpha olefin, olefin elastomers such as propylene-alpha-olefin, more like these hydrogenated products. These thermoplastic elastomers can be used alone or in combination of two or more.

  For the purpose of controlling adhesive properties, the thermoplastic elastomer may be, for example, a softener, an olefin resin, a silicone polymer, a liquid acrylic copolymer, a phosphate ester compound, or a tackifier as necessary. Anti-aging agents, hindered amine light stabilizers, UV inhibitors, and other additives such as fillers such as calcium oxide, magnesium oxide, silica, zinc oxide, and titanium oxide, and pigments may be appropriately blended. it can.

  Among the additives, the addition of a tackifier is effective for improving the adhesive strength of the pressure-sensitive adhesive. Examples of the tackifier include petroleum-based resins such as aliphatic copolymers, aromatic copolymers, aliphatic / aromatic copolymers and alicyclic copolymers, and coumarone-indene resins. , Terpene resins, terpene phenolic resins, rosin resins such as polymerized rosin, (alkyl) phenolic resins, xylene resins or hydrogenated products such as those generally used for adhesives Can be used without These tackifiers can be used alone or in combination of two or more. Moreover, what is marketed as a blend with an olefin resin can also be used for a tackifier.

  When a tackifier is used, the amount of the tackifier is not particularly limited, but it is 80 wt. Up to 60 parts by weight. In particular, the amount is preferably 50 parts by weight or less.

  Moreover, when a softening agent is blended as the additive, it is effective for improving the adhesive strength. Examples of the softening agent include low molecular weight diene polymers, polyisobutylene, hydrogenated polyisoprene, hydrogenated polybutadiene, and derivatives thereof. When the softener is used, the blending amount is not particularly limited. However, as the blending amount increases, the adhesive residue tends to increase when exposed to high temperature or outdoor exposure. It is preferably 20 parts by weight or less, particularly 10 parts by weight or less.

  The thickness of the pressure-sensitive adhesive layer is not particularly limited, and may be appropriately determined according to the required adhesive force and the like, but is about 1 to 50 μm, preferably 2 to 40 μm, and more preferably 5 to 20 μm.

  When using a solvent-based pressure-sensitive adhesive, drying and curing are performed using the heating device 27 and the like, and the pressure-sensitive adhesive layer 22 is formed. The pressure-sensitive adhesive tape 23 having the pressure-sensitive adhesive layer 22 formed on the base material 21 is wound up as a roll-shaped object 3R by the winding roll 5 through the guide roll 4. Prior to winding, it may be cut to a predetermined width.

  The pressure-sensitive adhesive tape of the present invention that can be produced in this way is the pressure-sensitive adhesive tape 23 having the pressure-sensitive adhesive layer 22 on one side of the base material 21, and the base material 21 is obtained by cutting the molded body 1 of polyolefin resin. And at least the substrate back surface 21a is a cutting surface.

  Since the dust is not generated in the cutting process, it can be used in a clean environment. According to this method, since a clean adhesive tape can be produced, it can be applied to fields requiring cleanliness, such as optical parts and electronic parts.

[Other Embodiments of Adhesive Tape]
(1) In the above-described embodiment, an example in which the outer periphery of a cylindrical molded body is cut to manufacture a film-like base material has been shown. However, in the present invention, any shape molded body is used. For example, similarly to the embodiment shown in FIG. 2, it is also possible to produce a substrate using a plate-shaped molded body.

  (2) In the above-described embodiment, an example of manufacturing a film-like base material by cutting a previously formed molded body has been shown. However, in the present invention, molding and cutting of the molded body are performed as a series of steps. You may go. Moreover, you may make it perform simultaneously shaping | molding of a molded object and integration of an adhesive layer by coextrusion. That is, by coextruding the base material and the pressure-sensitive adhesive layer, the two can be integrated and cut with the cutting blade to continuously form the release surface.

  For example, as shown in FIG. 5, cutting is performed with the cutting blade 2 while co-extrusion with the adhesive layer 22 / molded body 1 / adhesive layer 22 using a coextrusion molding machine 28 equipped with a T die 11 or the like. The back surface 21a of the adhesive tape 23 may be formed continuously. As the cooling unit, the cutting device for cutting, the take-up roll 5 and the like, the same ones as in the case of producing a release liner can be used. Moreover, you may use the molded object of the polyolefin resin shape | molded by the inflation method instead of the T-die method. According to the above method, two rolls of the adhesive tape 23 can be produced in one process, and the productivity can be remarkably improved. Moreover, the thickness of each adhesive layer and base material layer may be the same or different.

  (3) In the embodiment of the above (2), an example in which two rolls of adhesive tape are produced at the same time has been shown. However, in the present invention, an adhesive tape and a release liner can be produced simultaneously. For example, as shown in FIG. 6, using a coextrusion molding machine 28 equipped with a T-die 11 and the like, co-extrusion with two layers of the pressure-sensitive adhesive layer 22 / molded body 1 is performed by cutting with the cutting blade 2 and continuously sticking. The back surface 21a of the tape 23 and the release surface 3a of the release liner 3 may be formed.

  According to this method, the release liner 3 and the adhesive tape 23 can be simultaneously produced in one process, and the productivity can be remarkably improved. Further, the thickness of the release liner 3 and the thickness of the pressure-sensitive adhesive layer 22 and the substrate 21 may be the same or different.

  (4) In the present invention, the base material and the pressure-sensitive adhesive layer may be prepared separately, and these may be heat-laminated with a heating roll or the like to produce a pressure-sensitive adhesive tape. When performing thermal lamination, the substrate may be formed in a multilayer of two or more layers instead of a single layer.

  Moreover, the process of surface-processing a cutting surface after cutting can also be provided. For example, if heat treatment is performed with a mirror surface roll, a smooth and glossy adhesive tape appearance can be obtained. Moreover, if it heat-processes with an embossing roll or a sculpture roll, it can also make a dull appearance. According to this method, the appearance of the adhesive tape can be controlled. Here, a known technique can be used for the surface processing method, and there is no particular limitation.

  Examples of the present invention will be specifically described below, but the present invention is not limited to the examples.

(Example 1)
As shown in FIG. 2, a commercially available bag was applied to a 2 mm-thick low density polyethylene plate formed by the T-die method to obtain a release liner having a thickness of 80 μm.

(Example 2)
3 parts by weight of carbon powder is uniformly mixed with 97 parts by weight of ultra high molecular weight polyethylene (manufactured by Mitsui Chemicals, Ltd., Hi-Zex Million), filled in a mold, and compressed by applying a pressure of 20 MPa at 25 ° C. for 10 minutes After preforming, the pressure was lowered to 5 MPa and the temperature was raised to 210 ° C., and this state was cooled to room temperature for 120 minutes and taken out from the mold to obtain a cylindrical molded product having an outer diameter of 80 mm and an inner diameter of 40 mm. This cylindrical molded product was cut as shown in FIG. 1 to obtain a release liner having a thickness of 100 μm.

(Comparative example)
The release liner of Example 1 was evaluated using the back surface that was not cut.

(Evaluation methods)
As an evaluation tape, a surface protection tape (V-420 manufactured by Nitto Denko Corporation) was used, and the release liners and the evaluation tapes of Examples and Comparative Examples were pressure-bonded with a hand roller, and bonded to each other in a 50 ° C. environment for 3 days. placed. Table 1 shows the force required when the tape is peeled off at an angle of 180 ° at a speed of 300 mm / min in an atmosphere of 23 ° C. in units of N / 20 mm.

表１の結果が示すように、本発明である実施例１、２における剥離ライナーの離型力は、比較例の約１／４以下であり、良好であることがわかる。

As shown in the results of Table 1, it can be seen that the release force of the release liner in Examples 1 and 2 according to the present invention is about 1/4 or less that of the comparative example, which is favorable.

The front view which shows an example of the manufacturing method of the release liner of this invention The front view which shows the other example of the manufacturing method of the peeling liner of this invention The front view which shows the other example of the manufacturing method of the peeling liner of this invention The front view which shows an example of the manufacturing method of the adhesive tape of this invention The front view which shows the other example of the manufacturing method of the adhesive tape of this invention The front view which shows the other example of the manufacturing method of the adhesive tape of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Molding body 2 Cutting blade 3 Release liner 3a Release surface 10 Extruder 21 Base material 21a Base material back surface 22 Adhesive layer 23 Adhesive tape 28 Co-extruder

Claims (6)

  A release liner having a cut surface of a film formed by cutting a molded product of polyolefin resin as a release surface.   The pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer on one side of the base material is characterized in that the base material is a film obtained by cutting a molded product of polyolefin resin, and has at least the back surface of the base material as a cutting surface. Adhesive tape.   A method for producing a release liner, comprising a step of forming a release surface by cutting a polyolefin resin molded body.   The method for producing a release liner according to claim 3, wherein a release surface is continuously formed by cutting with a cutting blade while extruding the molded body.   In the method for producing an adhesive tape having a step of integrating at least the base material and the pressure-sensitive adhesive layer, the method comprises a step of forming a back surface of the base material by cutting a molded body of polyolefin resin. Manufacturing method of adhesive tape.   The method for producing a pressure-sensitive adhesive tape according to claim 5, wherein the integration is performed by co-extrusion molding of the base material and the pressure-sensitive adhesive layer, and the release surface is continuously formed by cutting with a cutting blade.

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