JP2009114299A - Pressure-sensitive adhesive double coated tape or sheet and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure-sensitive adhesive double coated tape or sheet excellent in transparency, heat resistance, electric insulation, cold resistance and compression set resistance and reducing the thickness and weight of an electronic device such as a mobile phone or a digital camera. <P>SOLUTION: Pressure-sensitive adhesive layers 2, 4 comprising a silicone-based pressure-sensitive adhesive are separately laid on both surfaces of a base material 3 comprising a silicone rubber sheet, wherein the sum of the thickness of the base material 3 comprising the silicone rubber sheet and the total thickness of the pressure-sensitive adhesive layers 2, 4 comprising the silicone-based pressure-sensitive adhesive is set to 8-700 μm. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a double-sided pressure-sensitive adhesive tape or sheet that is excellent in transparency, heat resistance, electrical insulation, cold resistance, and compression set, and that can reduce the thickness and weight of electronic devices such as mobile phones and digital cameras.

Conventionally, double-sided pressure-sensitive adhesive tapes can be easily punched into an arbitrary shape before being attached to an adherend, and thus are used for fixing parts in various industrial fields. The nameplates and display parts of electronic devices such as mobile phones and digital cameras have a complicated shape due to the downsizing of electronic devices and the components at the same time, so double-sided adhesive tape is used for these joints. ing. Silicone rubber is widely used as a member of electronic equipment because it is excellent in heat resistance, electrical insulation, chemical stability, cold resistance, compression set resistance, and the like. Double-sided adhesive tape is often used for bonding silicone rubber, but acrylic and rubber-based adhesives are difficult to adhere to silicone rubber. As described in Patent Documents 1 to 3, a double-sided pressure-sensitive adhesive tape in which a silicone-based pressure-sensitive adhesive is applied to at least one surface of a substrate such as a plastic film is often used. Further, as described in Patent Document 4, there is also an adhesive silicone rubber sheet obtained by press-molding only a silicone-based adhesive.
JP 2007-63571 A JP 2006-52384 A Japanese Patent Laid-Open No. 8-143834 JP 2005-75959 A

  However, since the invention disclosed in Patent Documents 1 to 3 uses a hard plastic film such as a polyester film as a base material, the excellent impact resistance and heat resistance specific to silicone rubber are impaired. Moreover, the invention disclosed in Patent Document 4 is a type that does not use a base material, and has a difficulty in punching workability.

  The present invention has been made to solve the above problems, and is excellent in transparency, heat resistance, electrical insulation, cold resistance, compression set resistance, and thinner electronic devices such as mobile phones and digital cameras, It aims at providing the double-sided adhesive tape or sheet | seat which can be reduced in weight.

  In order to achieve the object of the present invention, the present invention is configured as described in the claims.

  That is, the double-sided pressure-sensitive adhesive tape or sheet of the present invention is provided with a pressure-sensitive adhesive layer made of a silicone-based pressure-sensitive adhesive on both surfaces of a base material made of a silicone rubber sheet.

  Moreover, this invention provides the adhesive layer which consists of a silicone type adhesive on both surfaces of the base material which consists of a silicone rubber sheet, and also provides a peeling film layer on the adhesive layer which consists of the said silicone type adhesive.

  In these cases, the pressure-sensitive adhesive layer made of the silicone-based pressure-sensitive adhesive has a thickness of 2.5 μm to 100 μm.

  In these cases, the thickness of the substrate made of the silicone rubber sheet is 3 to 500 μm.

  In these cases, the sum of the thickness of the base material made of the silicone rubber sheet and the thickness of the pressure-sensitive adhesive layer made of the silicone-based pressure-sensitive adhesive is set to 8 to 700 μm.

  In the method for producing a double-sided pressure-sensitive adhesive tape or sheet, a first pressure-sensitive adhesive layer is formed by applying and drying a silicone pressure-sensitive adhesive on the release-treated surface of the first release film, and the first pressure-sensitive adhesive layer is made of a silicone rubber sheet. A base material is laminated, and further, a silicone pressure-sensitive adhesive is applied and dried on the release-treated surface of the second release film to form a second pressure-sensitive adhesive layer, and the second pressure-sensitive adhesive layer is made of the silicone rubber sheet. Materials are laminated to form a five-layer structure.

  Further, in the method for producing a double-sided pressure-sensitive adhesive tape or sheet, a silicone pressure-sensitive adhesive is applied to the release-treated surface of the first release film and dried to form a first pressure-sensitive adhesive layer, and the silicone rubber sheet is formed on the first pressure-sensitive adhesive layer. A base material made of the above-mentioned silicone rubber sheet, and a silicone-based pressure-sensitive adhesive is directly applied and dried on the surface opposite to the surface on which the first pressure-sensitive adhesive layer of the base material made of the silicone rubber sheet is provided. An adhesive layer is formed, and a release film is further bonded to the upper surface of the second adhesive layer to form a 5-layer structure.

  In the method for producing a double-sided pressure-sensitive adhesive tape or sheet, a first pressure-sensitive adhesive layer is formed by applying and drying a silicone pressure-sensitive adhesive on one release-treated surface of a release film subjected to double-sided release treatment, and the first pressure-sensitive adhesive layer. A base material made of a silicone rubber sheet is laminated, and a silicone pressure-sensitive adhesive is directly applied and dried on the surface of the base material made of the silicone rubber sheet opposite to the surface on which the first pressure-sensitive adhesive layer is provided. A layer structure is adopted.

  Since the double-sided pressure-sensitive adhesive tape or sheet of the present invention is provided with a pressure-sensitive adhesive layer made of a silicone-based pressure-sensitive adhesive on both surfaces of a base material made of a silicone rubber sheet, transparency, heat resistance, electrical insulation, cold resistance, compression resistance Excellent permanent set characteristics.

  In the double-sided pressure-sensitive adhesive tape or sheet of the present invention, a pressure-sensitive adhesive layer made of a silicone-based pressure-sensitive adhesive is provided on both sides of a base material made of a silicone rubber sheet, and a release film layer is further provided on the pressure-sensitive adhesive layer. Therefore, it has excellent transparency, heat resistance, electrical insulation, cold resistance, and compression set resistance.

  In these cases, since the pressure-sensitive adhesive layer made of the silicone-based pressure-sensitive adhesive has a thickness of 2.5 μm to 100 μm, it is possible to reduce the thickness of electronic devices such as mobile phone terminals and digital cameras.

  In these cases, since the thickness of the base material made of the silicone rubber sheet is 3 to 500 μm, it is excellent in workability in the punching process of parts such as mobile phone terminals and digital cameras. As a result, the mobile phone Electronic devices such as terminals and digital cameras can be made thinner.

  In these cases, since the sum of the thickness of the base material made of the silicone rubber sheet and the thickness of the pressure-sensitive adhesive layer made of the silicone-based pressure-sensitive adhesive is 8 to 700 μm, electronic devices such as mobile phone terminals and digital cameras Can be made thinner.

  In the method for producing a double-sided pressure-sensitive adhesive tape or sheet, a first pressure-sensitive adhesive layer is formed by applying and drying a silicone pressure-sensitive adhesive on the release-treated surface of the first release film, and the first pressure-sensitive adhesive layer is made of a silicone rubber sheet. A base material is laminated, and further, a silicone pressure-sensitive adhesive is applied and dried on the release-treated surface of the second release film to form a second pressure-sensitive adhesive layer, and the second pressure-sensitive adhesive layer is made of the silicone rubber sheet. Since the materials are laminated to form a five-layer structure, the thickness of the double-sided pressure-sensitive adhesive tape or sheet can be 8 to 700 μm.

  In the method for producing a double-sided pressure-sensitive adhesive tape or sheet, a silicone-based pressure-sensitive adhesive is applied to the release-treated surface of the first release film and dried to form a first pressure-sensitive adhesive layer, and a silicone rubber sheet is formed on the first pressure-sensitive adhesive layer. A base material made of the above-mentioned silicone rubber sheet, and a silicone-based pressure-sensitive adhesive is directly applied and dried on the surface opposite to the surface on which the first pressure-sensitive adhesive layer of the base material made of the silicone rubber sheet is provided. Since the pressure-sensitive adhesive layer is formed and the release film is further bonded to the upper surface of the second pressure-sensitive adhesive layer to form a five-layer structure, the thickness of the double-sided pressure-sensitive adhesive tape or sheet can be 8 to 700 μm. .

  In the method for producing a double-sided pressure-sensitive adhesive tape or sheet, a first pressure-sensitive adhesive layer is formed by applying and drying a silicone pressure-sensitive adhesive on one release-treated surface of a release film subjected to double-sided release treatment, and the first pressure-sensitive adhesive layer. A base material made of a silicone rubber sheet is laminated, and a silicone pressure-sensitive adhesive is directly applied and dried on the surface of the base material made of the silicone rubber sheet opposite to the surface on which the first pressure-sensitive adhesive layer is provided. Since it has a layer structure, the thickness of the double-sided pressure-sensitive adhesive tape or sheet can be 8 to 700 μm.

  The present inventors have continued to develop a double-sided pressure-sensitive adhesive tape or sheet that can be used for joining members of an electronic device. Now, a silicone polymer, a catalyst, and a cross-link are formed on both sides of a base material made of a silicone rubber sheet. Double-sided adhesive with excellent transparency, heat resistance, electrical insulation, cold resistance, and compression set resistance by providing a pressure-sensitive adhesive layer made of a modified silicone pressure-sensitive adhesive formed from a pressure-sensitive adhesive composition containing an adhesive. I was able to get the tape.

  In this case, the thickness of the substrate made of the silicone rubber sheet is 3 to 500 μm, the thickness of the pressure-sensitive adhesive layer made of the silicone-based pressure-sensitive adhesive is 2.5 to 100 μm, and the total thickness of the double-sided pressure-sensitive adhesive tape is 8 to 700 μm. Thus, the double-sided pressure-sensitive adhesive tape or sheet of the present invention can be suitably used as a component of electronic equipment, particularly digital cameras and mobile phone terminals, and can greatly contribute to the reduction in thickness and weight.

  The silicone polymer used for the pressure-sensitive adhesive layer composed of the silicone-based pressure-sensitive adhesive is preferably an addition type polymer or a condensation type polymer having a drying temperature of 100 to 160 ° C. The force is low, which is not preferable.

  The pressure-sensitive adhesive layer made of a silicone pressure-sensitive adhesive is a condensation-type organopolysiloxane or a silicone pressure-sensitive adhesive composition (addition reaction type) mainly composed of an organopolysiloxane having a hydrosilyl group in the molecule and a platinum metal catalyst. Polyorganosiloxane) is dried to form.

  As the condensed organopolysiloxane, for example, KR-100, X-40-3287, X-40-3212 (manufactured by Shin-Etsu Chemical), SH4280, SE4200, SD4284, Q2-7735 (manufactured by Toray Dow Corning) are used. However, it is not particularly limited to these.

  Examples of the addition reaction type polyorganosiloxane include SD4560, SD4570, SD4580, SD4584, SD4585, SD4592, BY24-740 (manufactured by Toray Dow Corning), X-40-3068, X-40-3102, and X-40. -3103 and X-40-3104 (manufactured by Shin-Etsu Chemical) are used, but are not particularly limited thereto.

  In addition, as the crosslinking agent for the condensation type polyorganosiloxane, for example, Nyper FF, Nyper BO, Nyper BMT-K40, Nyper BMT-M (manufactured by NOF Corporation) is used. Absent. Moreover, as an addition reaction type polyorganosiloxane crosslinking agent, for example, BY24-741, RD-1, and RD-2 (manufactured by Toray Dow Corning) are used, but are not particularly limited thereto.

  Moreover, as a compounding quantity of the said crosslinking agent, 0.1-1.5 weight part of the said adhesive composition is preferable. When the blending amount of the cross-linking agent is less than 0.1 parts by weight, the double-sided pressure-sensitive adhesive tape cannot hold 40 ° C. holding power, which is not preferable. On the other hand, if the amount exceeds 1.5 parts by weight, the crosslinking density becomes too high, resulting in an increase in cohesion and a 40 ° C. retention cannot be maintained.

  Moreover, as an addition reaction type polyorganosiloxane catalyst, for example, SRX212 catalyst (manufactured by Toray Dow Corning) and CAT-PL-50T (manufactured by Shin-Etsu Chemical) are used. Absent.

  Moreover, as a compounding quantity of the said catalyst, 0.1 weight part or more of the said adhesive composition is preferable. When the amount of the catalyst is less than 0.1 parts by weight, the reaction of the silicone polymer is not promoted, which is not preferable.

  In the double-sided pressure-sensitive adhesive tape or sheet of the present invention, the double-sided pressure-sensitive adhesive layer is different in the type of silicone-based pressure-sensitive adhesive, the type and amount of crosslinking agent, the type and amount of catalyst, and the thickness. It doesn't matter.

  Moreover, as a silicone rubber used for a base material, although KE-951, KE-550, KE-7611 (made by Shin-Etsu Chemical) etc. are used, for example, it is not limited to these in particular.

  In addition, as the release film, for example, a release film for a silicone pressure sensitive adhesive such as Burex (manufactured by Teijin), therapy (manufactured by Toray Film Co., Ltd.), nipper sheet (manufactured by nippers) having a thickness of 19 to 100 μm is used. However, it is not particularly limited to these.

  The double-sided pressure-sensitive adhesive tape or sheet of the present invention has an adhesive strength of 0.8 N / 10 mm or more, preferably 1.96 N / mm or more with respect to stainless steel. If the adhesive strength is less than 0.8 N / mm, the adhesive strength for fixing the component is low, which is not preferable. In addition, the holding force of the double-sided adhesive tape that can be used for material parts used in digital cameras, mobile phone terminals, etc. is not dropped for 24 hours when the adherend is a stainless steel plate, the test atmosphere is 40 ° C., and the load is 9.8 N. It is desirable. In the case where the holding force is broken between the adherend interface, the cohesive failure in the middle of the pressure-sensitive adhesive layer, and falling between the double-sided pressure-sensitive adhesive tape layers, the holding strength of the component is low, which is not preferable. Moreover, regarding the peeling force at the time of peeling a double-sided adhesive tape from a peeling film, 0.90 N / 10 mm or less, Preferably, 0.60 N / 10 mm or less is desirable.

  The base material thickness of the double-sided pressure-sensitive adhesive tape is preferably 3 to 500 μm, more preferably 10 to 100 μm. If the thickness of the base material is less than 3 microns, it is not preferable because the workability in the part punching process is poor and it is difficult to handle even during coating. On the other hand, if the thickness exceeds 500 μm, the repulsion of the base material is increased, and problems such as peeling and floating occur when the film is attached by bending at 90 °, which is not preferable.

  Further, the thickness of the silicone pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive tape is 2.5 to 100 μm, and more preferably 10 to 50 μm. When the thickness of the pressure-sensitive adhesive layer is less than 2.5 μm, the fixing force of the silicone rubber part or the like is low, which is not preferable. Moreover, since it will reduce the workability | operativity at the time of stamping if it exceeds 100 micrometers, it is unpreferable.

  The total thickness of the double-sided pressure-sensitive adhesive tape or sheet is preferably 8 to 700 μm, more preferably 30 to 200 μm. When the total thickness of the double-sided pressure-sensitive adhesive tape or sheet is less than 8 μm, the fixing force of the silicone rubber part or the like is low, which is not preferable. Moreover, since it cannot respond to thickness reduction and weight reduction of an electronic device when it exceeds 700 micrometers, it is unpreferable.

  Next, the manufacturing method of the double-sided pressure-sensitive adhesive tape or sheet of the present invention will be specifically described with reference to the drawings.

  In the production method of the present invention, as shown in FIG. 1, the first pressure-sensitive adhesive layer 2 is formed by applying and drying a silicone pressure-sensitive adhesive on the release-treated surface of the first release film 1. A substrate 3 made of a silicone rubber sheet is laminated on 2. Next, a silicone pressure-sensitive adhesive is applied to the release treatment surface of the second release film 5 to form a second pressure-sensitive adhesive layer 4, and the base material 3 made of a silicone rubber sheet is applied to the second pressure-sensitive adhesive layer 4. A double-sided adhesive tape or sheet having a five-layer structure is laminated.

  In addition, as shown in FIG. 1, another manufacturing method of the present invention forms a first pressure-sensitive adhesive layer 2 by applying and drying a silicone-based pressure-sensitive adhesive on the release-treated surface of the first release film 1. 1 A substrate 3 made of a silicone rubber sheet is laminated on the adhesive layer 2. Next, the second pressure-sensitive adhesive layer 4 is formed by directly applying and drying a silicone-based pressure-sensitive adhesive on the surface opposite to the surface on which the first pressure-sensitive adhesive layer 2 of the base material 3 made of a silicone rubber sheet is provided. The second release film 5 is bonded to the pressure-sensitive adhesive surface of the second pressure-sensitive adhesive layer 4 to form a double-sided pressure-sensitive adhesive tape or sheet having a five-layer structure.

  In addition, as shown in FIG. 2, another production method of the present invention forms a first pressure-sensitive adhesive layer 2 by applying and drying a silicone-based pressure-sensitive adhesive on one release-treated surface of a release film 6 that has been subjected to double-sided release treatment. The base material 3 made of a silicone rubber sheet is laminated on the first pressure-sensitive adhesive layer 2. Next, the second pressure-sensitive adhesive layer 4 is formed by directly applying and drying a silicone-based pressure-sensitive adhesive on the surface opposite to the surface on which the first pressure-sensitive adhesive layer 2 of the base material 3 made of a silicone rubber sheet is provided. A double-sided pressure-sensitive adhesive tape or sheet having a four-layer structure is used.

  Hereinafter, the double-sided pressure-sensitive adhesive tape or sheet of the present invention will be specifically described with reference to examples. However, the double-sided pressure-sensitive adhesive tape or sheet of the present invention is not limited to these. In the description of Examples and Comparative Examples, “part” represents part by weight, “μm” represents thickness, and “falling or deviation mm” represents holding force characteristics.

[Example 1]
Add 100 parts of condensation type silicone adhesive Q2-7735 (manufactured by Toray Dow Corning), 4.5 parts of cross-linking agent NIPPER BMT-K40 (manufactured by NOF Corporation) and 50 parts of toluene, mix uniformly, and have a thickness of 75 μm. On the release film for silicone pressure-sensitive adhesive, it is applied and dried so that the thickness of the pressure-sensitive adhesive layer is 30 μm, and is bonded to a base material made of a silicone rubber sheet having a thickness of 30 μm to produce a first surface coated product. Similarly, on another release film for a silicone adhesive having a thickness of 75 μm, the adhesive is applied so as to have an adhesive layer thickness of 30 μm, dried, and bonded to the non-adhesive surface side of the first surface coated product. Thus, a double-sided pressure-sensitive adhesive tape having a total thickness of 90 μm was obtained. As shown in Table 1, this double-sided pressure-sensitive adhesive tape had excellent adhesive strength and holding power.

[Example 2]
Addition reaction type silicone adhesive SD4580FC (manufactured by Toray Dow Corning) 100 parts, catalyst SRX212 (manufactured by Toray Dow Corning) 0.9 parts, crosslinking agent BY-24-741 (manufactured by Toray Dow Corning) 1.0 parts and toluene 50 Parts are added, mixed uniformly, and coated on a release film for a silicone adhesive with a thickness of 75 μm, dried so that the adhesive layer has a thickness of 30 μm, and bonded to a substrate made of a silicone rubber sheet with a thickness of 30 μm. Then, a first surface coated product is produced. Similarly, on another release film for a silicone adhesive having a thickness of 75 μm, the adhesive is applied so as to have an adhesive layer thickness of 30 μm, dried, and bonded to the non-adhesive surface side of the first surface coated product. Thus, a double-sided pressure-sensitive adhesive tape having a total thickness of 90 μm was obtained. As shown in Table 1, this double-sided pressure-sensitive adhesive tape had excellent adhesive strength and holding power.

[Example 3]
Condensation type silicone adhesive KR130 (manufactured by Shin-Etsu Chemical Co., Ltd.), 100 parts of crosslinking agent NIPPER BMT-K40 (manufactured by NOF Corporation) and 50 parts of toluene are added and mixed uniformly, and a silicone adhesive having a thickness of 75 μm On the release film for coating, the pressure-sensitive adhesive layer is applied and dried so as to have a thickness of 30 μm, and bonded to a base material made of a silicone rubber sheet having a thickness of 30 μm to produce a first surface coated product. Similarly, on another release film for a silicone adhesive with a thickness of 75 μm, the adhesive is applied so as to have an adhesive layer of 30 μm, dried, and bonded to the non-adhesive side of the first surface coated product. Thus, a double-sided pressure-sensitive adhesive tape having a total thickness of 90 μm was obtained. As shown in Table 1, this double-sided pressure-sensitive adhesive tape had excellent adhesive strength and holding power.

[Example 4]
Addition reaction type silicone adhesive SD4580FC (manufactured by Toray Dow Corning) 100 parts, catalyst SRX212 (manufactured by Toray Dow Corning) 0.9 parts, crosslinking agent BY-24-741 (manufactured by Toray Dow Corning) 1.0 parts and toluene 50 A substrate made of a silicone rubber sheet having a thickness of 3 μm, coated and dried on a 75 μm-thick silicone adhesive release film so as to have a pressure-sensitive adhesive layer thickness of 2.5 μm, Bonding is performed to produce a first surface coated product. Similarly, on another release film for a silicone adhesive having a thickness of 75 μm, the adhesive is applied so as to have an adhesive layer thickness of 2.5 μm, dried, and then applied to the non-adhesive surface side of the first surface coated product. By combining them, a double-sided pressure-sensitive adhesive tape having a total thickness of 8 μm was obtained. As shown in Table 1, this double-sided pressure-sensitive adhesive tape had excellent adhesive strength and holding power.

[Example 5]
Addition reaction type silicone adhesive SD4580FC (manufactured by Toray Dow Corning) 100 parts, catalyst SRX212 (manufactured by Toray Dow Corning) 0.9 parts, crosslinking agent BY-24-741 (manufactured by Toray Dow Corning) 1.0 parts and toluene 50 Parts are added, mixed uniformly, and coated on a release film for a silicone adhesive with a thickness of 75 μm, dried so that the adhesive layer has a thickness of 100 μm, and bonded to a base material made of a silicone rubber sheet with a thickness of 500 μm. Then, a first surface coated product is produced. Similarly, on another release film for silicone adhesive with a thickness of 75 μm, the adhesive is applied so as to have an adhesive layer thickness of 100 μm, dried, and bonded to the non-adhesive surface side of the first surface coated product. Thus, a double-sided pressure-sensitive adhesive tape having a total thickness of 700 μm having a five-layer structure was obtained. As shown in Table 1, this double-sided pressure-sensitive adhesive tape had excellent adhesive strength and holding power.

[Example 6]
Add 100 parts of condensation type silicone adhesive Q2-7735 (manufactured by Toray Dow Corning), 4.5 parts of cross-linking agent NIPPER BMT-K40 (manufactured by NOF Corporation) and 50 parts of toluene, mix uniformly, and have a thickness of 75 μm. On the release film for silicone pressure-sensitive adhesive, it is applied and dried so that the thickness of the pressure-sensitive adhesive layer is 30 μm, and is bonded to a base material made of a silicone rubber sheet having a thickness of 30 μm to produce a first surface coated product. Next, the adhesive is applied to the non-adhesive surface side of the first surface coated product so as to have a thickness of 30 μm, dried, and a 75 μm-thick silicone adhesive release film is bonded to the upper surface thereof, A double-sided pressure-sensitive adhesive tape having a total thickness of 90 μm having a five-layer structure was obtained. As shown in Table 1, this double-sided pressure-sensitive adhesive tape had excellent adhesive strength and holding power.

[Example 7]
Add 100 parts of condensation type silicone adhesive Q2-7735 (manufactured by Toray Dow Corning), 4.5 parts of cross-linking agent NIPPER BMT-K40 (manufactured by NOF Corporation) and 50 parts of toluene, mix uniformly, and have a thickness of 75 μm. On the release film for the silicone adhesive that has been peeled on both sides, the adhesive layer is applied to a thickness of 30 μm, dried, and bonded to a substrate made of a silicone rubber sheet with a thickness of 30 μm. Make a product. Next, the adhesive was applied to the non-adhesive surface side of the first surface coated product so as to have a thickness of 30 μm and dried to obtain a double-sided adhesive tape having a four-layer structure with a total thickness of 90 μm. As shown in Table 1, this double-sided pressure-sensitive adhesive tape had excellent adhesive strength and holding power.

[Comparative Example 1]
Add 100 parts of acrylic adhesive SK Dyne 1604X (manufactured by Soken Chemical Co., Ltd.) and 3.0 parts of epoxy curing agent E-AX (manufactured by Soken Chemical Co., Ltd.), mix uniformly, and on a general-purpose release film having a thickness of 75 μm, The adhesive layer is applied and dried so as to have a thickness of 30 μm, and is bonded to a base material made of a silicone rubber sheet having a thickness of 30 μm to produce a first surface coated product. Similarly, on another general-purpose release film having a thickness of 75 μm, the above-mentioned pressure-sensitive adhesive is applied and dried so as to have a pressure-sensitive adhesive layer thickness of 30 μm, and bonded to the non-adhesive surface side of the first surface coated product. A double-sided pressure-sensitive adhesive tape having a total thickness of 90 μm was obtained. As shown in Table 1, this double-sided pressure-sensitive adhesive tape is poor in adhesion to silicone rubber, and thus causes a throwing failure (peeling between the base material layer and the pressure-sensitive adhesive layer) and satisfies the standard value. I couldn't get strength and holding power.

[Comparative Example 2]
Synthetic rubber adhesive BPS4595 (manufactured by Toyo Ink) is added, mixed uniformly, coated on a general-purpose release film with a thickness of 75 μm, dried to a thickness of 30 μm, and dried from a silicone rubber with a thickness of 30 μm. A first surface coated product is prepared by laminating with a base material to be formed. Similarly, on another general-purpose release film having a thickness of 75 μm, the above-mentioned pressure-sensitive adhesive is applied and dried so as to have a pressure-sensitive adhesive layer thickness of 30 μm, and bonded to the non-adhesive surface side of the first surface coated product. A double-sided pressure-sensitive adhesive tape having a total thickness of 90 μm was obtained. As shown in Table 1, this double-sided pressure-sensitive adhesive tape is poor in adhesion to the silicone rubber sheet, and thus causes throwing destruction (peeling between the base material layer and the pressure-sensitive adhesive layer) and satisfies the standard value. Adhesive strength and holding power could not be obtained.

次に、本発明の両面粘着テープ諸特性の測定方法を下記に示す。

Next, a method for measuring various properties of the double-sided pressure-sensitive adhesive tape of the present invention is shown below.

  [Thickness] According to JIS-Z-0237 (2000). In addition, the dial gauge prescribed | regulated to JIS-B-7503 is used for the measurement of thickness.

  [Adhesive strength] In accordance with JIS-Z-1528 (2004), a polished stainless steel plate (thickness: 1.5 mm) was used as the adherend, and a test piece lined with a 0.019 mm thick polyester film was applied. Then, after reciprocating once with a roller having a load of 19.6 N, 20 minutes later, peeled in a 180 ° direction at a peeling speed of 300 mm / min and measured with an Aiko tensile tester.

  [Retention force] According to JIS-Z-1528 (2004), it is lined with a polyester film having a thickness of 0.019 mm, dropped (min) or misaligned width (mm) at a measurement temperature of 40 ° C., a load of 9.8 N, and a test time of 24 hours. ) Was measured.

  [Peeling force] The surface opposite to the surface to be measured was bonded to a stainless steel plate, and the peeling paper on the side to be measured was peeled in a 180 ° direction at a peeling speed of 300 mm / min with an Aiko tensile tester and measured. .

The block diagram of the double-sided adhesive tape or sheet | seat of this invention is represented. The another block diagram of the double-sided adhesive tape or sheet | seat of this invention is represented.

Explanation of symbols

1: First release film, 2: First pressure-sensitive adhesive layer, 3: Substrate made of silicone rubber sheet, 4: Second pressure-sensitive adhesive layer, 5: Second release film, 6: Release subjected to double-sided release treatment the film

Claims (8)

  A double-sided pressure-sensitive adhesive tape or sheet, wherein a pressure-sensitive adhesive layer made of a silicone-based pressure-sensitive adhesive is provided on both surfaces of a base material made of a silicone rubber sheet.   Double-sided pressure-sensitive adhesive, characterized in that a pressure-sensitive adhesive layer made of a silicone-based pressure-sensitive adhesive is provided on both surfaces of a base material made of a silicone rubber sheet, and further a release film layer is provided on the pressure-sensitive adhesive layer made of the silicone-based pressure-sensitive adhesive. Tape or sheet.   The double-sided pressure-sensitive adhesive tape or sheet according to claim 1, wherein the pressure-sensitive adhesive layer made of the silicone-based pressure-sensitive adhesive has a thickness of 2.5 μm to 100 μm.   The double-sided pressure-sensitive adhesive tape or sheet according to any one of claims 1 to 3, wherein a thickness of the substrate made of the silicone rubber sheet is 3 to 500 µm.   5. The sum of the thickness of the base material made of the silicone rubber sheet and the thickness of the pressure-sensitive adhesive layer made of the silicone-based pressure-sensitive adhesive is 8 to 700 μm. 5. Double-sided adhesive tape or sheet.   A first pressure-sensitive adhesive layer is formed by applying and drying a silicone-based pressure-sensitive adhesive on the release-treated surface of the first release film, and laminating a base material made of a silicone rubber sheet on the first pressure-sensitive adhesive layer. A silicone pressure-sensitive adhesive is applied to the release-treated surface of the release film to form a second pressure-sensitive adhesive layer, and a base material composed of the silicone rubber sheet is laminated on the second pressure-sensitive adhesive layer to form a five-layer structure. A method for producing a double-sided pressure-sensitive adhesive tape or sheet.   A first pressure-sensitive adhesive layer is coated and dried on the release surface of the first release film to form a first pressure-sensitive adhesive layer, and a base material made of a silicone rubber sheet is laminated on the first pressure-sensitive adhesive layer. A second adhesive layer is formed by directly applying and drying a silicone-based adhesive on the surface of the base material made of a rubber sheet opposite to the surface on which the first adhesive layer is provided. A method for producing a double-sided pressure-sensitive adhesive tape or sheet comprising a five-layer structure in which a release film is bonded to the upper surface of an agent layer.   Applying and drying a silicone-based adhesive on one release-treated surface of the release film subjected to double-sided release treatment to form a first adhesive layer, laminating a substrate made of a silicone rubber sheet on the first adhesive layer, A double-sided pressure-sensitive adhesive tape comprising a four-layer structure in which a silicone-based pressure-sensitive adhesive is directly coated and dried on the surface opposite to the surface on which the first pressure-sensitive adhesive layer of the base material comprising the silicone rubber sheet is provided Or the manufacturing method of a sheet | seat.

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