JP2007084750A - Adhesive tape - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide adhesive tape prevented from adhesive overhang off the tape side rim. <P>SOLUTION: The adhesive tape comprises a tape substrate and an adhesive layer on the substrate, wherein the side rim along the longitudinal direction on the substrate is furnished with the adhesive's non-forming face. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an adhesive tape. More preferably, the present invention relates to an adhesive tape in which the sticking out of the adhesive from the side of the adhesive tape is prevented.

  Conventionally, an adhesive tape having a tape-like support substrate and an adhesive layer formed on the support substrate has been used in various applications. In addition to use in general households, in recent years, its use has also become widespread at the manufacturing site of industrial products. When manufacturing industrial products, especially precision products, it is necessary to be able to adhere to articles accurately and to obtain sufficient adhesiveness stably so that peeling and misalignment do not occur even when applied to a production line. Become. And sufficient heat resistance is also requested | required depending on a use. Moreover, when it is necessary to peel the adhesive tape which became unnecessary, it is also important that the peeling is easy.

As the improvement of the adhesive tape progresses, the adhesive tape is also used for the production of electronic parts such as printed wiring boards that require a high degree of processing accuracy (Japanese Patent Application Laid-Open No. 10-250907 and special patents). No. 2002-58541). The adhesive tape described in Japanese Patent Application Laid-Open No. 7-292332 is specifically used by sticking to a heat generating element or a pressing device for heat sealing work, and heat sealing when the heat sealing work is repeated. The present invention relates to a tape that does not transfer wrinkles to a target article, and is significantly different from the pressure-sensitive adhesive tape according to the present invention in the purpose of use, the mode of use, and the effect.
JP-A-10-250907 JP 2002-58541 A JP 7-292332 A

  The pressure-sensitive adhesive tape is one in which the pressure-sensitive adhesive forming surface of the supporting substrate is pressed against a pressure-sensitive adhesive object at room temperature or under heating conditions, and the two are bonded by a physical action between the pressure-sensitive adhesive and the adherend. . The pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape is subjected to certain pressing conditions during the pressure-sensitive adhesive treatment or after the pressure-sensitive adhesive treatment depending on the product form, manufacturing conditions, and the like. At that time, there is a problem that the pressure-sensitive adhesive protrudes from the end portion of the supporting substrate due to deformation of the pressure-sensitive adhesive layer or fluidization of the pressure-sensitive adhesive. In particular, when subjected to heating conditions, this problem was likely to occur due to softening of the adhesive. The sticking adhesive may stick to an unintended part where the adhesive tape is not intended, attach dust to the adhesive tape, or adhere to the production line or product, etc., causing various problems. There was a thing.

  The present invention provides a pressure-sensitive adhesive tape in which the pressure-sensitive adhesive is prevented from protruding from the side of the tape by providing a non-formation surface of the pressure-sensitive adhesive layer at the side edge along the longitudinal direction on the surface of the tape-like support base. It is to provide.

  Therefore, the pressure-sensitive adhesive tape according to the present invention is a pressure-sensitive adhesive tape having a tape-shaped support substrate and a pressure-sensitive adhesive layer formed on one side of the tape-shaped support substrate, and the tape-shaped support substrate. It has a non-formation surface of the above-mentioned pressure-sensitive adhesive layer in the side edge along the longitudinal direction on the surface.

  Such a pressure-sensitive adhesive tape according to the present invention includes, as a preferred embodiment, one in which the tape-shaped pressure-sensitive adhesive is colored so that the tape-shaped support substrate and the pressure-sensitive adhesive can be visually distinguished. To do.

  Such a pressure-sensitive adhesive tape according to the present invention includes, as a preferred embodiment, one in which the area of the non-forming surface of the pressure-sensitive adhesive layer is larger than the amount of increase in the area of the pressure-sensitive adhesive layer caused by the pressure-sensitive adhesive treatment.

  The pressure-sensitive adhesive tape according to the present invention is a pressure-sensitive adhesive tape having a tape-shaped support substrate and a pressure-sensitive adhesive layer formed on the tape-shaped support substrate. Since the adhesive layer is not formed on the side edge along the direction, the adhesive is prevented from protruding from the side of the adhesive tape. Therefore, problems caused by the sticking out of the adhesive, such as sticking the adhesive tape to an unnecessary part, sticking dust to the adhesive tape, sticking the sticking adhesive to the production line or product, etc. There is no problem.

  In addition, since the adhesive is prevented from being exposed to some extent even when the adhesive position of the adhesive tape with respect to the adhesive object is shifted due to some circumstances after the adhesion, the adhesive tape is completely unnecessary in the same manner as described above. There are no problems such as sticking, dust and the like adhering to the adhesive tape, and adhesives adhering to the production line or products.

  The pressure-sensitive adhesive tape according to the present invention is a pressure-sensitive adhesive tape having a tape-shaped support substrate and a pressure-sensitive adhesive layer formed on one side of the tape-shaped support substrate, on the surface of the tape-shaped support substrate. It has the non-formation surface of the said adhesive layer in the side edge part along the longitudinal direction of this.

The best mode for carrying out the present invention will be described below with reference to the drawings.
First, FIG. 1 is a perspective view showing a basic form example of an adhesive tape according to the present invention.

  The pressure-sensitive adhesive tape 1 in FIG. 1A is the most basic form, and has a tape-shaped support base 2 and a pressure-sensitive adhesive layer 3 formed on the tape-shaped support base 2. And it has the non-formation surface 4 of the said adhesive layer in the side edge part along the longitudinal direction on the said tape-shaped support base material surface. The pressure-sensitive adhesive tape 1 is wound from one end of the pressure-sensitive adhesive tape to form a roll 5 in the same manner as a general pressure-sensitive adhesive tape.

  In the pressure-sensitive adhesive tape including the pressure-sensitive adhesive tape according to the present invention, a pressure-sensitive adhesive treatment is performed by bringing the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer 3 into contact with an object to be bonded and pressing it. At that time, it is observed that the pressure-sensitive adhesive layer is plastically deformed and does not return to its original shape even after the pressure is removed, and the area of the pressure-sensitive adhesive layer on the support base increases. In particular, when the pressure-sensitive adhesive treatment is performed under heating or when exposed to a high temperature condition after the pressure-sensitive adhesive treatment, the area increase amount of the pressure-sensitive adhesive layer tends to increase due to the softening of the pressure-sensitive adhesive. Also, when the pressure applied to the pressure-sensitive adhesive layer is large, the area increase of the pressure-sensitive adhesive layer is large.

  In the conventional pressure-sensitive adhesive tape in which the pressure-sensitive adhesive layer is formed on the entire surface of the support substrate, and the area of the support base material and the area of the pressure-sensitive adhesive layer are substantially equal, this corresponds to an increase in the area of the pressure-sensitive adhesive layer due to pressing. In some cases, the pressure-sensitive adhesive protrudes from the side edge portion of the support base material. However, in the pressure-sensitive adhesive tape 1 according to the present invention, the pressure-sensitive adhesive layer is formed on the side edge portion along the longitudinal direction on the tape-shaped support base material surface 2. 3, even if the area of the pressure-sensitive adhesive layer 3 is increased, the pressure-sensitive adhesive is prevented from protruding from the side edge of the support base 2.

  In the present invention, it is sufficient that the area of the non-formed surface 4 is larger than the area increase amount of the pressure-sensitive adhesive layer produced by the pressure-sensitive adhesive treatment. The amount of increase in the area of the pressure-sensitive adhesive layer 3 caused by the pressure-sensitive adhesive treatment varies depending on the type of pressure-sensitive adhesive, the thickness and width of the pressure-sensitive adhesive layer, the conditions of the pressure-sensitive adhesive treatment, etc., but usually 0.1% to 10% (before the pressure-sensitive adhesive treatment) The area of the pressure-sensitive adhesive layer is often 100%). Accordingly, the area of the non-formed surface 4 is preferably 0.2% to 20%, particularly preferably 0.5% to 15% (before the adhesive treatment), compared to the area of the adhesive layer 3 before the adhesive treatment. It is sufficient to increase the area of the PSA layer to 100%.

  However, in the production of the pressure-sensitive adhesive tape of the present invention, since the minimum width on one side of the substantially non-formed surface 4 is about 3 mm, the area of the non-formed surface 4 is 0.1 to The range is not limited to 10%.

  FIG. 1B is a perspective view of another preferred embodiment of the adhesive tape according to the present invention. The pressure-sensitive adhesive tape 11 according to the present invention shown in FIG. 1B has a tape-shaped support base 21 and a plurality of pressure-sensitive adhesive layers 31 to 35 formed on the tape-shaped support base 21. It is a tape, Comprising: It has the non-formation surfaces 41 and 42 of the said adhesive layer in the side edge part along the longitudinal direction on the said tape-shaped support base material surface. The pressure-sensitive adhesive tape 11 is wound up from one end of the pressure-sensitive adhesive tape to form a roll 51, like a general pressure-sensitive adhesive tape. Although FIG. 1 (B) shows five pressure-sensitive adhesive layers 31 to 35, the number of pressure-sensitive adhesive layers is arbitrary in the pressure-sensitive adhesive tape according to the present invention. Moreover, the width | variety and thickness of each adhesive layer, the kind of adhesive which forms an adhesive layer, etc. may be the same in each adhesive layer, or may differ. The pressure-sensitive adhesive tape 11 according to the present invention has the pressure-sensitive adhesive layer non-formation surfaces 41 and 42 at side edges along the longitudinal direction on the tape-like support base material surface 21, Similarly, even if the areas of the pressure-sensitive adhesive layers 31 to 35 are increased, the pressure-sensitive adhesive is prevented from protruding from the side portion of the support base material 21.

  In the pressure-sensitive adhesive tapes 1 and 11 according to the present invention shown in FIG. 1 (A) or FIG. 1 (B), the widths of the pressure-sensitive adhesive layers 3 and 31 to 35 are different even if they are the same in all portions of the pressure-sensitive adhesive tape. The width of the non-formation surfaces 4, 41, 42 of the pressure-sensitive adhesive layer may be the same or different at all locations of the pressure-sensitive adhesive tape. Therefore, the shape of the end portions 3a and 31a of the pressure-sensitive adhesive layer may be linear as shown in FIG. 1 (A) or FIG. 1 (B), or other shapes (not shown). Good.

  The pressure-sensitive adhesive tape according to the present invention is preferably capable of visually distinguishing the tape-shaped support substrate and the pressure-sensitive adhesive. Therefore, when the material color of the tape-shaped support substrate is the same as or similar to the material color of the pressure-sensitive adhesive and is not easy to visually identify, the pressure-sensitive adhesive is colored and the tape-shaped It is preferable that the supporting substrate and the pressure-sensitive adhesive are visually distinguishable.

  The tape-like support bases 2 and 21 in the pressure-sensitive adhesive tape according to the present invention can be formed of various synthetic resin materials, particularly heat-resistant resin materials such as polyamide 6, 6, polyester, polyimide, polyimide amide resin, Films made of fluororesin such as polytetrafluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, ethylene-tetrafluoroethylene copolymer, glass fiber, alumina Heat-resistant woven or non-woven fabric made of inorganic fibers such as fibers, boron fibers, basalt fibers, titania fibers, and organic fibers such as aramid fibers, polyarylate fibers, and polyparaphenylenebenzobisoxazole fibers were impregnated and fired with fluororesin Base , And other materials can be used such as paper, cloth and the like. From the viewpoint of dimensional stability, those having high rigidity and having sufficient strength or resistance against heat, moisture, pressure or tensile force are preferred. The thickness and width of the tape-like support bases 2 and 21 are also arbitrary, and can be determined as appropriate according to the specific use of the pressure-sensitive adhesive tape according to the present invention. For example, the thickness of the tape-like support bases 2 and 21 is 0.05 mm to 0.20 mm, particularly 0.07 mm to 0.15 mm, and the width of the tape-like support bases 2 and 21 is 15 mm to 100 mm. In particular, 19 mm to 75 mm is preferable.

  The pressure-sensitive adhesive forming the pressure-sensitive adhesive layers 3 and 31 to 35 is not particularly limited, and those used in this type of conventional pressure-sensitive adhesive tape can also be used in the present invention. For example, an acrylic, rubber or silicone pressure sensitive adhesive can be used. In view of heat resistance, a silicone-based pressure-sensitive adhesive is particularly preferable among the above. The thickness and width of the pressure-sensitive adhesive layers 3, 31 to 35 are arbitrary, and can be appropriately determined in consideration of the adhesive force and the like realized by the pressure-sensitive adhesive. The thickness of the pressure-sensitive adhesive layer 3 is preferably 20 μm to 60 μm, particularly 30 μm to 50 μm, and the width of the pressure-sensitive adhesive layer 3 is preferably 9 mm to 80 mm, particularly 13 mm to 60 mm. The thickness of the adhesive layers 31 to 35 is preferably 20 μm to 60 μm, particularly 30 μm to 50 μm, and the width of the adhesive layers 31 to 35 is preferably 3 mm to 20 mm, particularly 5 mm to 10 mm.

  The pressure-sensitive adhesive tape according to the present invention is the same as the conventional pressure-sensitive adhesive tape except that the non-forming surface of the pressure-sensitive adhesive layer is formed on the side edge portion along the longitudinal direction on the support base material surface. Can be manufactured. For example, an adhesive that forms the adhesive layer 3 of the pressure-sensitive adhesive tape 1 according to the present invention is applied to one side of a wide sheet that becomes the tape-shaped support substrate 2 of the pressure-sensitive adhesive tape 1 according to the present invention, and Several pressure-sensitive adhesive layers 3 are formed on the sheet, and then the sheet is wound to form a roll. Then, the roll 5 of the adhesive tape 1 by this invention can be manufactured by cut | disconnecting this roll in the cutting position located between the said several strips of adhesive layers.

  The pressure-sensitive adhesive tape according to the present invention is a pressure-sensitive adhesive tape having a tape-shaped support substrate and a pressure-sensitive adhesive layer formed on the tape-shaped support substrate. Since the adhesive layer is not formed on the side edge portion along the direction, the adhesive is prevented from protruding from the tape side portion. Therefore, the pressure-sensitive adhesive tape according to the present invention can be used for various applications. That is, the pressure-sensitive adhesive tape according to the present invention is used, for example, in general households, as well as in industrial product manufacturing sites, particularly precision products such as electronic elements such as printed wiring boards and IC chips, or electric products using these electronic elements. , Can be used for manufacturing and assembly.

  The pressure-sensitive adhesive treatment of the pressure-sensitive adhesive tape according to the present invention can be performed at room temperature and under heating conditions. The pressure-sensitive adhesive tape according to the present invention has a non-formation surface of the pressure-sensitive adhesive layer at the side edge portion along the longitudinal direction on the surface of the tape-like support base material, so that the pressure-sensitive adhesive softens and the pressure-sensitive adhesive easily protrudes. Even if the adhesive treatment is performed under heating conditions, for example, 160 ° C. to 220 ° C., particularly 180 ° C. to 200 ° C., the adhesive is prevented from protruding from the side of the tape.

<Example 1>
Silicone containing 2 parts by mass of an organic oxide benzoyl peroxide with respect to 100 parts by mass of a silicone-based adhesive on one side of a 100 μm thick polytetrafluoroethylene (PTFE) film treated with a commercially available metal sodium treatment solution A toluene solution of an adhesive (Shin-Etsu Chemical Co., Ltd., KR101-10) is applied in a plurality of streaks with an adhesive thickness of 40 μm at intervals of an adhesive application width of 44 mm and an adhesive non-formation surface width of 6 mm. Then, after heating at 80 ° C. for 2 minutes, the heat-cured material at 150 ° C. for 5 minutes was wound around a paper tube. In this adhesive tape wound around a paper tube, by cutting the center of the non-adhesive surface of the adhesive, an adhesive tape with a width of 44 mm at the center and an adhesive tape having a width of 50 mm with 3 mm at both ends being non-adhesive surfaces. Produced.

<Example 2>
An aqueous suspension containing 50% by mass of colloidal silica and 50% by mass of PTFE powder was applied to one side of a PTFE film having a thickness of 50 μm, and the silica was attached and fired by heating at a temperature of 350 ° C. for 1 minute. Next, a toluene solution of a silicone-based adhesive (Toray Dow Corning, SD4580) containing 0.9 part by mass of platinum catalyst SRX-212 with respect to 100 parts by mass of the silicone-based adhesive on the adhered and fired surface, An adhesive having a width of 15 mm and a non-adhesive surface width of 10 mm was applied in a plurality of streaks with an adhesive thickness of 45 μm and allowed to stand at 100 ° C. for 5 minutes. In this adhesive tape wound around a paper tube, by cutting the center of the non-adhesive surface of the adhesive, an adhesive tape having a width of 15 mm at the center and an adhesive tape having a total width of 25 mm where both ends are non-adhesive surfaces is 5 mm. Produced.

<Example 3>
It is contained in a ratio of 50% by mass of colloidal silica and 50% by mass of PTFE powder on one side of a base material (fluororesin adhesion rate 60% by mass) obtained by impregnating and firing an aqueous suspension of PTFE into a woven fabric of glass fiber having a thickness of 70 μm. The aqueous suspension was applied and heated at a temperature of 350 ° C. for 1 minute to deposit and fire silica. Next, a toluene solution of a silicone-based adhesive (Toray Dow Corning, SD4580) containing 0.9 part by mass of platinum catalyst SRX-212 with respect to 100 parts by mass of the silicone-based adhesive on the adhered and fired surface, An adhesive having a width of 40 mm and a non-adhesive surface width of 10 mm was applied in a plurality of streaks with an adhesive thickness of 40 μm and allowed to stand at 100 ° C. for 5 minutes. By cutting the center of the non-adhesive surface of the adhesive in this adhesive tape wound around a paper tube, an adhesive tape having a total width of 50 mm, in which the adhesive coating width is 40 mm at the center and both ends are 5 mm are non-adhesive surfaces. Produced.

<Example 4>
In Example 3, the adhesive in the center part was also the same as in Example 3 except that 3 parts by mass of color paste CP-81 (manufactured by Toray Dow Corning Co., Ltd.) was added to 100 parts by mass of the silicone-based adhesive. An adhesive tape having a width of 50 mm and a width of 50 mm and a width of 5 mm at both ends, which are non-adhesive surfaces, was prepared.

<Comparative Example 1>
A pressure-sensitive adhesive tape having a total width of 50 mm was obtained in the same manner as in Example 1 except that the pressure-sensitive adhesive was applied to the entire surface.

Evaluation results Two A4 sheets of a base material (fluororesin adhesion rate 60 mass%) obtained by impregnating and firing a PTFE aqueous suspension on a woven fabric of glass fiber having a thickness of 70 μm were butted in the width direction. After sticking the adhesive tape produced in Example 1 to the upper surface so that a part may become a centerline, it was made to reciprocate twice with the roller of 2 kg in mass from the top of the adhesive tape, and the sample for evaluation was produced.

  The operation of heating the sample to 200 ° C. and holding it at a load of 1500 N for 30 seconds was repeated 20 times, but no sticking-out of the adhesive from the end of the adhesive tape was observed.

However, in the comparative sample produced in the same manner except that the adhesive tape produced in the comparative example was used, the protrusion of the adhesive from the end of the adhesive tape was confirmed by finger touch.

FIG. 1 (A) and FIG. 1 (B) are perspective views showing preferred specific examples of the adhesive tape according to the present invention. 2 (A) and 2 (B) are sectional views showing preferred specific examples of the pressure-sensitive adhesive tape according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11 Adhesive tape 2 Tape-like support base material 3, 31, 32, 33, 34, 35 Adhesive layer 3a, 31a End part of adhesive layer 3b Near center of adhesive layer 3, 4, 41, 42 Adhesive Non-forming surface of layer 5, 51 roll

Claims (3)

  A pressure-sensitive adhesive tape having a tape-shaped support substrate and a pressure-sensitive adhesive layer formed on one side of the tape-shaped support substrate, the side along the longitudinal direction on the surface of the tape-shaped support substrate An adhesive tape having a non-formation surface of the adhesive layer at an edge.   The pressure-sensitive adhesive tape according to claim 1, wherein the tape-shaped pressure-sensitive adhesive is colored so that the tape-shaped support substrate and the pressure-sensitive adhesive can be visually distinguished.   The pressure-sensitive adhesive tape according to claim 1 or 2, wherein an area of the non-forming surface of the pressure-sensitive adhesive layer is larger than an area increase amount of the pressure-sensitive adhesive layer generated by the pressure-sensitive adhesive treatment.

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