TW201443185A - Substrate-free double-sided silica gel - Google Patents

Abstract

[SUBJECT] The present invention provides a substrate-free double-sided silica gel with an adhesive layer, wherein the adhesive layer can inhibit residual adhesive on one desired side during separation of parts after the lamination of two parts. [SOLUTION MEANS] The substrate-free double-sided silica gel 10 has a laminate structure sequentially configured with a first peeling sheet 2, an adhesive layer 1 formed by a silicon-based adhesive composition, and a second peeling sheet 3, wherein the two main sides 1A and 1B of the adhesive layer 1 have a difference in adhesion strength between 2 mN/25mm to 20 mN/25mm, and the main side 1B with a higher adhesion strength in the adhesive layer has an adhesion strength of less than 700 mN/25mm.

Description

Non-substrate double-sided silicone

The present invention relates to a substrateless double sided silicone.

In recent years, in the field of manufacturing of display devices, the field of manufacturing semiconductor parts, and the field of manufacturing electrical and electronic components, two parts (such as a glass substrate, a silicon wafer, etc.) can be processed to The adhesive is applied to the surface of a laminate consisting of a component/adhesive/component. Such processing may, for example, be a film forming (dry or wet) process, an etching process, a sandblasting process, a chemical etching process, or the like.

As an adhesive used for such a use, for example, Patent Document 1 discloses a method of using a tantalum cured product for release paper. Further, in Patent Document 2, a double-sided tape in which a tantalum adhesive layer, a substrate, and a reduced-viscosity layer are sequentially laminated is disclosed.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] International Publication No. 2008/111361

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2012-057029

However, the cured product of the release paper for the release paper of Patent Document 1 cannot be said. It is very adhesive to the glass and will fall off during work. There is a problem in that it is impossible to select which glass to leave the cured product on the glass when peeling off after the completion of the work. Further, although the double-sided tape of Patent Document 2 solves the problem in Patent Document 1, it not only increases the manufacturing cost, but also has a problem in thermal deterioration of the reduced-viscosity layer at the time of high-temperature use.

The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a non-substrate double-sided silicone having an adhesive layer, which is characterized in that it can be used for separating the two members after the bonding of the two members. The adhesive is selectively peeled off without residue on a part of the material.

In order to achieve the above object, the present invention provides a substrateless double-sided silicone which is characterized in that the structure is an adhesive layer formed of a first release sheet and a bismuth-based adhesive composition, and a second release layer. a laminated body arranged in this order, and a difference in adhesion between the two main faces of the adhesive layer is 2 mN/25 mm or more and 20 mN/25 mm or less, and a main surface having a high adhesive force in the adhesive layer The bonding force is 700 mN/25 mm or less (Invention 1).

In the above invention (Invention 1), at least one of the first release sheet and the second release sheet is preferably formed by applying a fluorine-based release agent to at least one main surface of the support (Invention 2).

In the above invention (Invention 1 and Invention 2), the ruthenium-based adhesive composition preferably contains ruthenium rubber containing a siloxane as a main component and a olefin-containing additional polyorganosiloxane. And a platinum catalyst containing 0.01 parts by mass or more and 3 parts by mass or less per 100 parts by mass of the above-mentioned ruthenium rubber, and 15 parts by mass or more and 100 parts per 100 parts by mass of the above-mentioned ruthenium rubber. Anthracene resin of the following parts by mass (Invention 3).

According to the present invention, the adhesive layer having the baseless double-sided silicone is not a substrate-free adhesive layer, and the difference between the adhesive force of one main surface and the adhesive force of the other main surface is set within a certain range. The upper limit of the adhesive force of the main surface having a relatively high adhesive force has been specified. In addition, the adhesive layer is formed by a lanthanide binder. Therefore, when two members are bonded together with such an adhesive layer, the main surface having a relatively low adhesive force in the adhesive layer is attached to one surface of the member which is not intended to remain the adhesive, and when the two members are separated, The material is preferentially separated from the interface of the adhesive layer.

Therefore, when the surface of the layered body in which the two parts are bonded together is processed, the main surface of the adhesive layer having a relatively low adhesive force is applied to one of the surfaces on which the processing is performed, thereby performing the processing. When the material is difficult to be peeled off from the adhesive layer, and after the two parts are separated after processing, the operation of removing the residual adhesive is not required on the surface of the processed part, thereby improving the processing. The efficiency of the overall operation.

10‧‧‧No substrate double-sided silicone

1‧‧‧Adhesive layer

1A‧‧‧ Main surface (low adhesion surface) laminated on the first peeling surface 2A of the adhesive layer 1

1B‧‧‧ Main surface (high adhesion surface) which is laminated on the second peeling surface 3A of the adhesive layer 1

2‧‧‧1st peeling piece

2A‧‧‧1st peeling surface

2a‧‧‧1st peeling treatment layer

2b‧‧‧1st support material

3‧‧‧2nd peeling piece

3A‧‧‧2nd peeling surface

3a‧‧‧2nd peeling treatment layer

3b‧‧‧2nd support material

Fig. 1 is a schematic cross-sectional view showing a substrateless double-sided silicone according to a first embodiment of the present invention.

The description of the embodiment of the present invention is as follows.

1. Non-substrate double-sided silicone

As shown in FIG. 1, the above-mentioned substrateless double-sided according to the first embodiment of the present invention The silicone rubber 10 is bonded to each of the main surfaces 1A and 1B of the adhesive layer 1 formed of the bismuth-based adhesive composition, and has a release surface formed by the surface of the release-treated layers 2a and 2b according to the fluorine-based release agent. Release sheets of 2A and 2B (first release sheet 2, second release sheet 3).

(1) adhesive layer

(1-1) Composition

The adhesive layer 1 is provided with the baseless double-sided silicone 10 according to the present embodiment, and is formed of a ruthenium-based adhesive composition containing the components described below. The adhesive composition of the lanthanum adhesive has an excellent heat resistance compared to the composition of the adhesive, for example, compared with the acrylic adhesive composition, and thus the adhesive formed by the lanthanum adhesive composition The layer 1 is less likely to cause defects such as lift, peeling, and foaming upon heating.

The bismuth-based adhesive composition according to the present embodiment is preferably a ruthenium rubber having a siloxane group as a main skeleton and an ethylenically-added organopolysiloxane as a constituent component. By containing the above ruthenium rubber, the adhesion of the adhesive layer 1 can be moderately lowered. Therefore, the adhesive layer 1 can be easily peeled off from the adherend; in addition, depending on the cohesive breakage of the adhesive layer 1, the residue of the material constituting the adhesive layer 1 on the adherend can be made extremely small. .

Specific examples of the alkenyl group include an allyl group, a propenyl group, a butenyl group, a pentenyl group, a hexenyl group, a butenyl group, an octenyl group, and the like. Further, an organic group having no additional reactivity may also be contained. Specific examples of such an organic group include an alkyl group such as a methyl group, an ethyl group or a propyl group, or an aryl group such as a phenyl group.

The degree of polymerization of the organopolyoxane belonging to the above-mentioned ruthenium rubber is not particularly limited, but is usually preferably 500 or more and 10,000 or less, and more preferably 2,000 or more and 8,000 or less.

The ruthenium-based adhesive composition according to the present embodiment preferably contains a platinum catalyst. The platinum catalyst has a function of causing the above alkenyl group to start an additional reaction, and a function of promoting the additional reaction. The type of the platinum catalyst may, for example, be platinum black, platinum chloride, chloroplatinic acid, platinum chloride and a monovalent ethanol reactant, a complex of chloroplatinic acid and an olefin, or bis(acetamidine acetate). Platinum and the like. When the ruthenium-based adhesive composition according to the present embodiment contains the ruthenium rubber and the platinum catalyst, the content of the ruthenium-based adhesive composition of the platinum catalyst is preferably 0.01 parts by mass or more per 100 parts by mass of the ruthenium rubber. , 3 parts by mass or less. When maintained in this range, the platinum catalyst can stably perform its function. The content of the platinum catalyst in the ruthenium-based adhesive composition is preferably 0.05 parts by mass or more and 2.00 parts by mass or less per 100 parts by mass of the ruthenium rubber, in view of the fact that the function of the platinum catalyst is more stably exhibited; It is preferably 0.10 parts by mass or more and 1.00 parts by mass or less.

According to the bismuth-based adhesive composition of the present embodiment, it is preferable to contain an oxime resin, that is, an organic polysiloxane having a divergence in a molecule. Since the enamel resin is contained, the adhesion of the adhesive layer 1 to the adherend can be improved. When the bismuth-based adhesive composition according to the present embodiment contains the above-mentioned ruthenium rubber and enamel resin, the content of the ruthenium resin in the ruthenium-based adhesive composition is The amount of the ruthenium rubber is preferably 10 parts by mass or more and 100 parts by mass or less. The content of the oxime resin in the ruthenium-based adhesive composition is more preferably 15 parts by mass or more and 75 parts by mass or less per 100 parts by mass of the ruthenium rubber, from the viewpoint of more appropriately setting the above-mentioned adhesiveness; 20 parts by mass or more and 50 parts by mass or less.

According to the bismuth-based adhesive composition of the present embodiment, various components can be contained as long as the adhesive layer 1 can exhibit the intended function. For example A bridging agent with a hydroformylalkyl group, a bridging catalyst, a coloring material such as a dye or a pigment, an antioxidant such as an aniline or a phenol, an ultraviolet absorber such as a benzophenone or a benzotriazole, talc or titanium dioxide. Filling components such as cerium oxide and starch, plasticizers, antioxidants, light stabilizers, dispersants, leveling agents, etc. In addition, the lanthanum-based adhesive composition of the present embodiment contains a bridging agent having a hydroformylalkyl group, and the content thereof is preferably 1.0 part by mass or more and 10.0 parts by mass or less per 100 parts by mass of the ruthenium rubber.

(1-2) Adhesion

In the adhesive layer 1 having the substrate-free double-sided silicone 10 according to the present embodiment, the adhesive force of one main surface 1A is lower than that of the other main surface 1B. Further, in the patent specification of the present invention, the measuring method of the adhesive force is carried out in accordance with the measuring method shown in the examples described later.

According to the patent specification of the present invention, the adhesive layer 1 having the baseless double-sided silicone according to the present embodiment is provided, and the main surface 1A having a low adhesive force on the main surface is referred to as a "low-adhesion surface", and the adhesive force is high. The main surface 1B is called a "high adhesion surface". Further, the member which is arranged to face the low-adhesion surface at the time of use is referred to as a "first member", and the member which is arranged to face the high-adhesion surface at the time of use is referred to as a "second member". In addition, the first member and the second member may be collectively referred to as "adhered matter".

The adhesive layer 1 having the substrate-free double-sided silicone 10 according to the present embodiment has a difference between the adhesive force of the high-adhesion surface 1B and the adhesive force of the low-adhesion surface 1A (also referred to as "the patent specification of the present invention" Poor adhesion") 2mN/25mm or more, 20mN/25mm or less. Since the difference in the adhesive force is within the above range, when the two adherends bonded together without the base double-sided silicone 10 are separated, the preferential separation of the interface between the first member and the adhesive layer 1 can be stably achieved. Therefore, the adhesive is difficult Remains in the first part.

If the difference in adhesion is less than 2mN/25mm, the possibility of the adhesive remaining on the first part will be increased. In addition, if the difference of the adhesion is more than 20 mN/25 mm, the adhesion force of the low adhesion surface 1A may become too low. In this case, the stage before the separation of the two adherends is performed, for example, for the first part. In the processing work, there is a possibility that the adhesive layer 1 is easily peeled off in the first member.

In order to more stably reduce the possibility of the adhesive layer 1 being peeled off in the first part, and also to achieve a more stable between the first part and the adhesive layer 1 in the two adhering operations. The difference in adhesion is preferably 2.5 mN/25 mm or more and 18 mN/25 mm or less, more preferably 3 mN/25 mm or more and 16 mN/25 mm or less, and particularly preferably 4 mN/25 mm or more and 10 mN/25 mm or less.

The adhesive layer 1 having the baseless double-sided silicone 10 according to the present embodiment has a high adhesion force surface 1B having an adhesive force of 700 mN/25 mm or less. If the adhesion force of the high-adhesion surface 1B is more than 700 mN/25 mm, the adhesion of the low-adhesion surface 1A may become high. In this case, there is a high possibility that cohesive breakage occurs in the inside of the adhesive layer 1, or there is a possibility that adhesive remains in the first member when the first member and the second member are separated. In order to more stably reduce the possibility that the adhesive remains in the first member due to cohesive breakage, the adhesive force of the high-adhesion surface 1B is preferably 600 mN/25 mm or less, more preferably 400 mN/25 mm or less, and particularly preferably 200 mN/ 25mm or less.

The adhesive layer 1 having the substrate-free double-sided silicone 10 according to the present embodiment is a substrate-free adhesive layer, and the adhesive force of one main surface (high adhesion surface) 1B is opposite to the other main surface ( Low adhesion surface) 1A difference in adhesion (bonding) The force difference is set to a certain range, and the upper limit of the bonding force of the main surface (high adhesion surface) 1B having a relatively high bonding force is defined. Further, the adhesive layer 1 is formed of a lanthanum-based adhesive. Therefore, when the two adherends are bonded to the adhesive layer 10, the main surface (low adhesion surface) 1A having a relatively low adhesive force in the adhesive layer 1 is attached to the adhesive which is unwilling to remain adhesive. When the adherend (the first member) separates the two adherends, the separation between the first member and the adhesive layer 1 can be preferentially performed.

Therefore, when the workpiece is processed on one of the adherends formed by bonding two adherends, the adherend can be used as the first member, and the adhesive surface of the adhesive layer 1 can be relatively low. (Low adhesion surface) 1A is attached to the first part. When this processing is performed, peeling of the first member and the adhesive layer 1 is less likely to occur, and after the two adherends are separated after the processing, the adhesive remaining on the surface of the processed first member is not required to be removed. Work, thus improving the overall efficiency of the process. When necessary, the two adherends are properly maintained in the bonded state, and the separation of the adhesive on the one side of the adherend is difficult to occur due to the adhesive residue of the adhesive layer 1 The properties of the adhesive layer of this function are also referred to as "re-peeling controllability" in the patent specification of the present invention. The adhesive layer 1 having the baseless double-sided silicone 10 according to the present embodiment has excellent re-peeling controllability.

In the adhesive layer 1 having the substrate-free double-sided silicone 10 according to the present embodiment, the lower limit of the adhesive force of the high-adhesion surface 1B is such that the adhesion is poor to 20 mN/25 mm. The adhesive layer 1 having the baseless double-sided silicone 10 according to the present embodiment preferably has a bonding strength of the high-adhesion surface 1B of 30 mN/25 mm or more, and more preferably 40 mN/, depending on the preferable range of the adhesive strength. 25 mm or more, particularly preferably 60 mN / 25 mm or more.

The adhesive layer 1 having the baseless double-sided silicone 10 according to the present embodiment has a range of adhesion force of the low-adhesion surface 1A, as long as the range of the adhesion difference and the adhesion range of the high-adhesion surface 1B are satisfied. There is no special restriction. Between the processing operations and the like, in order to more stably reduce the possibility of the adhesive layer 1 being peeled off on the first member, and also to achieve the first member and the adhesive more stably in the two adherend separation operations. The preferential separation between the layers 1 is preferably 10 mN/25 mm or more and 698 mN/25 mm or less, more preferably 20 mN/25 mm or more and 398 mN/25 mm or less, and particularly preferably 30 mN/25 mm or more and 198 mN/25 mm or less.

(1-3) Thickness

The thickness of the adhesive layer 1 having the substrate-free double-sided silicone 10 according to the present embodiment is not particularly limited. If the adhesive layer 1 is too thin, it will be difficult to obtain a desired degree of adhesion to the adherend (the first member and the second member). In order to easily obtain an appropriate degree of adhesion, the thickness of the adhesive layer 1 is preferably 2 μm or more, more preferably 5 μm or more, and particularly preferably 10 μm or more. Further, the upper limit of the thickness of the adhesive layer 1 can be appropriately set according to the use thereof, and is usually 200 μm or less, preferably 100 μm or less, and more preferably 50 μm or less.

(2) peeling sheet

As shown in Fig. 1, the baseless double-sided silicone 10 according to the present embodiment includes two sheets of release papers 2, 3. In the patent specification of the present invention, the release sheet 2 which is laminated on the low adhesion surface 1A is referred to as a "first release sheet". Further, the release sheet 3 which is laminated on the high adhesion surface 1B is referred to as a "second release sheet".

(2-1) 1st peeling piece

As shown in FIG. 1, the substrateless double-sided silicone 10 according to the embodiment is provided. The first release sheet 2 has a first release treated layer 2a laminated on one main surface of the first support member 2b and the first support member 2b. The first peeling surface 2A is a peeling surface of the first peeling sheet 2 and is formed by the opposing main surface of the first peeling treatment layer 2a facing the main surface of the first supporting member 2b.

The material constituting the first support member 2b is not particularly limited. Specific examples include: polyethylene film, polypropylene film, polyisobutylene film, polybutadiene film, polyethyl film, polyvinyl chloride film, polyvinyl chloride copolymer film, polyethylene terephthalate film, poly Naphthalene dicarboxylic acid film, polyterephthalic acid film, polyurethane film, vinyl acetate film, ionomer resin film, ethylene ‧ (meth) acrylate copolymer film, ethylene ‧ (meth) acrylate copolymer film, poly A styrene film, a polycarbonate film, a polyimide film, a polyetherimide film, a polyarylamine film, a polyetherketone film, a polyetheretherketone film, a fluororesin film, or the like. These bridge films are also an example of the material constituting the first support member 2b. The first support member 2b may be a laminate film. The material constituting the first support member 2b is preferably a polyethylene terephthalate film or a polyethylene naphthalate film, for the purpose of dimensional stability and economy.

The thickness of the first support member 2b is not particularly limited. It is usually about 5 to 300 μm, and is preferably about 10 to 100 μm in order to facilitate use and economy.

In the present embodiment, the first release-treated layer 2a is formed by applying a fluorine-based release agent to one main surface of the first support member 2b. The first release sheet 2 includes the first release surface 2A, and the first release surface 2A is composed of the surface of the first release treatment layer 2a formed of a fluorine-based release agent, and the first release sheet 2 is composed of a lanthanum-based adhesive. The adhesive layer 1 according to the present embodiment formed by the composition can be easily peeled off It is also suitable for this. Further, as will be described later, since the first release-treated layer 2a is formed by applying a fluorine-based release agent, the adhesive force of the main surface 1A of the adhesive layer 1 can be lowered, and the position of the main surface 1A of the adhesive layer 1 can be lowered. The first peeling surface 2A formed by the surface of the first peeling treatment layer 2a.

The coating amount of the fluorine-based release agent is not particularly limited. It is usually about 0.02 g/m ² to 2.0 g/m ² , preferably 0.2 g/m ² to 1.0 g/m ² . The coating method of the release agent is not particularly limited, and the coating method to be notified may be employed. Specific examples of the coating method include a gravure coating method, a Meyer bar coating method, an anastomosis coating method, and the like.

(2-2) 2nd peeling piece

As shown in Fig. 1, the second release sheet 3 including the baseless double-sided silicone 10 according to the first embodiment of the present invention has a second layer which is laminated on one main surface of the second support member 3b and the second support member 3b. The treated layer 3a is peeled off. The second peeling surface 3A is a peeling surface of the second peeling sheet 3 and is formed by the opposing main surface of the second peeling treatment layer 3a facing the main surface of the second supporting member 3b.

The material constituting the second support member 3b is not particularly limited. Specific examples and suitable examples of such a material are the same as those constituting the first support member 2b. The thickness of the second support member 3b is not particularly limited. It is usually about 5 to 300 μm, and is preferably about 10 to 100 μm from the viewpoint of ease of use and economy.

In the present embodiment, the second release-treated layer 3a is formed by applying a fluorine-based release agent to one main surface of the second support member 3b. The second peeling surface 3A is composed of the surface of the second release treated layer 3a, and the surface of the second release treated layer 3a is formed of a fluorine-based release agent, and the second release surface 3A is formed of a ruthenium-based adhesive composition. According to the adhesive layer 1 of the present embodiment, peeling can be easily performed, and this is also suitable. The coating amount of the fluorine-based release agent is not particularly limited. It is usually about 0.02 g/m ² to 2.0 g/m ² , preferably 0.2 g/m ² to 1.0 g/m ² . The coating method of the release agent is not particularly limited, and the coating method to be notified may be employed. Specific examples of the coating method include a gravure coating method, an anastomosis coating method, and the like.

2. Method for manufacturing non-substrate double-sided silicone

The method for producing the baseless double-sided silicone 10 according to the present embodiment is not particularly limited. According to the manufacturing method described below, the baseless double-sided silicone 10 according to the present embodiment can be easily obtained, and is preferable.

First, a coating liquid prepared by adding a solvent to the composition of the present invention is prepared. When the solvent is used, the type and the solid content of the coating liquid can be appropriately set in consideration of the composition of the lanthanum binder composition, the coating conditions, the thickness of the target adhesive layer 1, and the like. The solvent may, for example, be toluene, methyl ethyl ketone or ethyl acetate, and the concentration range of the solid content is about 10% by mass or more and about 40% by mass.

Next, the coating liquid is applied onto the first peeling surface 2A of the first release sheet 2, and the coating layer is formed by drying. When the ripening period is required, the ripening period is ensured, and if the ripening period is not required, the coating layer is directly made into the adhesive layer 1.

The coating method of the coating liquid is not particularly limited. A gravure coating method, a bar coating method, a doctor blade coating method, a blade coating method, and the like which are usually carried out can be used. The detailed method of the drying treatment after coating is not limited. The drying temperature is not limited. For example, it can be heated in the range of 90 ° C ~ 150 ° C. The drying treatment time is also not limited, and can be appropriately set in consideration of the drying temperature. When the drying time is 5 minutes or longer, the adhesion force to the main surface 1A of the adhesive layer 1 formed on the first release surface 2A of the first release sheet 2 can be stably lowered, which is preferable. From a similar point of view, to dry A drying time of 8 minutes or more is particularly preferred. In addition, although there is no upper limit of the drying time, it is about 30 minutes in consideration of the manufacturing cost.

The second release sheet 3A of the second release sheet 3 is attached to the surface of the first release sheet 2 and the adhesive layer 1 thus obtained, which is formed of the adhesive layer 1, and the first release sheet 2 is obtained. The non-substrate double-sided silicone 10 in which the adhesive layer 1 and the second release sheet 3 are laminated in this order. The obtained substrateless double-sided silicone 10 can be subjected to a ripening process as required. There are no restrictions on the conditions of ripening. For example, it is left to stand in an atmosphere of 23 ° C and a relative humidity of 50% for one week.

The adhesive layer 1 which is laminated on the first peeling surface 2A of the first peeling sheet 2 is a coating layer obtained by applying a coating liquid onto the first peeling surface 2A, and is connected to the first peeling surface 2A. Under the process of drying and the like. On the other hand, the adhesive layer 1 laminated on the second release surface 3A of the second release sheet 3 is attached to the second surface of the adhesive layer 1 formed by drying the coating layer. Face 3A. According to the different lamination method of the adhesive layer 1, the adhesive force of the main surface 1A facing the first peeling surface 2A of the adhesive layer 1 can be made lower than that of the main surface 1B facing the second peeling surface 3A. Adhesion. That is, the adhesive layer 1 having the substrate-free double-sided silicone 10 manufactured by the above-described manufacturing method has a main surface 1A which is a low adhesion surface and a main surface 1B which is a high adhesion surface.

Further, according to the above manufacturing method, the adhesive force of the main surface 1A of the adhesive layer 1 can be made lower than the adhesive force of the main surface 1B, and the first peeling surface 2A of the first peeling sheet 2 can be made smaller than the second one. The second peeling surface 3A of the release sheet 3 is more difficult to peel off (improving the peeling force). Therefore, according to the method for producing the baseless double-sided silicone 10 described above, even as the material of the first release sheet 2 and the second release sheet 3, the same type of release sheet is used, and the obtained substrate-free double-sided silicone 10 is obtained. 1st When the release sheet 2 is a release sheet which is relatively difficult to peel off, the second release sheet 3 is a release sheet which is relatively easily peeled off. In other words, according to the method for producing the non-substrate double-sided silicone 10, it is possible to obtain a peeling sheet and a ruthenium-based adhesive composition, and to provide a light-peelable release sheet and an adhesive layer, and a heavy peel-off type. The film, together with the adhesive layer, has a non-substrate double-sided silicone 10 having different adhesive forces on each other.

3. Method of using non-substrate double-sided silicone

When the non-substrate double-sided silicone 10 is used, in order to expose the main surface 1A of the adhesive layer 1 having a low adhesion surface, the first release sheet 2 may be peeled off first, or the adhesion of the high adhesion surface may be exposed first. The main surface 1B of the agent layer 1 is first peeled off from the second release sheet 3. As a specific example, the case where the main surface 1B of the adhesive layer 1 is exposed first will be described below.

As a second member, a member for placing a sheet during processing such as film formation or etching is prepared, and the main surface 1B of the adhesive layer 1 from which the release sheet 3 is removed from the baseless double-sided silicone 10 is attached. On the side of the second part.

Next, the first release sheet 2 which is laminated on the adhesive layer 1 which is formed on one surface of the second member is peeled off, and the main surface 1A of the adhesive layer 1 is exposed. Next, a first member which is a member to be bonded to the second member and the adhesive layer 1 (an image for performing film formation or etching) is prepared, and the adhesive layer 1 is attached to one surface of the first member. The main face 1A. Thus, a laminated structure in which the second member, the adhesive layer 1 and the first member are laminated in this order can be obtained.

After the film forming, etching, or the like is performed on the exposed surface of the first member of the laminated structure, when the first member and the second member are separated, The interface between the first member and the adhesive layer 1 can be preferentially peeled off, so that the processed first member can be obtained, and the adhesive does not remain on the surface of the adhesive layer 1 .

Here, even if the first member is processed, the laminated structure is heated, and as a result, the adhesive layer 1 is in a high temperature environment, because the adhesive layer 1 is formed of a lanthanum-based adhesive composition as described above. Therefore, the deterioration of the adhesive layer 1 or the occurrence of a change in the state of the adhesive layer 1 and the adherend is less likely to occur.

There is a possibility of placing the above-mentioned adhesive layer 1 in a high temperature environment, and specific examples thereof include indium tin oxide (ITO) by steaming and drying, and fluorine-doped tin oxide (FTO). ), zinc oxide (ZnO), and a transparent conductive film such as a zinc oxide-based material (AZO, GZO) in which aluminum and gallium are added to the acidified lead.

The composition and structure of the adherend (the first member and the second member) are not particularly limited. As a specific example of the adherend, a glass substrate can be mentioned. When the adherend is a glass substrate, the specific type of the material constituting the glass substrate is not particularly limited. For example, there are chemically strengthened glass, flawless glass, quartz glass, soda lime glass, bismuth glass, aluminosilicate glass, bismuth glass, borosilicate glass, bismuth boron bismuth glass, and the like. The thickness of the glass substrate is not particularly limited. It is usually 0.1 mm to 5 mm, preferably 0.2 mm to 2 mm. Further, the glass substrate is also suitably used as a mounting plate during processing.

The adherend can also be composed of a heat resistant plastic material. In the case where the adherend is formed of a heat-resistant plastic film, specific examples thereof are: a polyimide film, a polyamide film, a polyimide film, a polyimide film, and a polyphenylene sulfide thin film. A film, a polyetheretherketone film, a polyarylate film, a polycarbonate film, a liquid crystal polymer film, a polyethylene naphthalate film, and a laminate of two or more kinds thereof. The plastic film can be extended in one axis or in two axes.

More specific examples of the adherend include a semiconductor wafer, a semiconductor component such as a package, and a display device such as a peeling cover sheet, a protective film, a polarizing film, and a retardation film; and a circuit substrate such as a glass epoxy resin. , electrical and electronic components such as housings. In addition, as a member which functions as a support member of such a member, a substrate formed of a mother glass, a metal material, a ceramic material, or the like may be mentioned as a specific example of the adherend.

According to the main surface of the adhesive layer 1 of the present embodiment, a plurality of adherends may be laminated. At this time, the adherends which are close to each other can be isolated in the in-plane direction of the surface of the adhesive layer 1 according to the present embodiment.

The layered body between the adhesive layer 1 and the second member obtained by separating the first member material is not particularly limited in the subsequent treatment method. The adhesive layer 1 and the second member can also be separated, and the second member can be reused. The adhesive layer 1 according to the present embodiment is formed of a ruthenium-based adhesive composition as described above, and the adhesive force of the main surface 1B of the adhesive layer 1 facing the second member is 700 mN/25 mm or less. It is easier to peel the adhesive layer 1 from the second member, and the adhesive derived from the adhesive layer 1 does not easily remain on the surface of the second member. Therefore, the second member obtained by peeling off the adhesive layer 1 does not need to be complicated to remove the adhesive, and can be used again.

The embodiments described above are intended to facilitate the understanding of the present invention and are not intended to limit the present invention. Therefore, each element explicitly expressed in the above embodiments is intended to include all design changes or equalizations falling within the technical scope of the present invention. Things.

For example, the second release sheet 3 may be formed of a release agent other than the fluorine release agent, or may not include the second release treatment layer 3a, and the second support member 3b may face the adhesive layer. 1 is provided with the peeling property, and the 2nd peeling surface 3A is formed. Examples of the release agent other than the fluorine-based release agent that provides the second release treatment layer 3a include an alkyd-based, an anthraquinone-based, a fluorine-based, an unsaturated polyester-based, a polyolefin-based, and a wax-based release agent. When the second peeling surface 3A is formed by the surface of the second supporting member 2b, a fluororesin film is used as a specific example of the second supporting member 3b.

In the case where the base surface (low adhesion surface) 1A of the adhesive layer 1 is first exposed when the baseless double-sided silicone 10 is used, the surface of the first member can be attached to the first member. 2 The release sheet 3, the adhesive layer 1 and the laminate formed of the first member are peeled off from the second release sheet 3, and the main surface (high adhesion surface) 1B of the exposed adhesive layer 1 is attached to the second member. Side.

[Examples]

Hereinafter, the present invention will be more specifically described by the examples, but the scope of the present invention is not limited by the examples and the like.

[Example 1]

(1) Modulation of the coating fluid of the lanthanum binder composition

40 parts by mass of ruthenium resin (manufactured by Dow Corning Toray Co., Ltd., trade name: SD4587L) and platinum catalyst (manufactured by Dow Corning Toray Co., Ltd.) in an amount of 100 parts by mass of the addition-curing type ruthenium rubber (product name: KS-847H) , trade name: SRX-212) 0.6 parts by mass, and a coating liquid of a ruthenium-based adhesive composition in which the solid content was adjusted to 25% by mass with methyl ethyl ketone was prepared.

(2) Production of adhesive sheets

A release film having a release agent layer composed of barium fluoride on one side of a polyethylene terephthalate (PET) film (thickness: 50 μm) was prepared as a release sheet (Lindeco Co., Ltd., Product name: SP-PET50FD) Two sheets, each used as a first release sheet and a second release sheet.

On the peeling surface (first peeling surface) of the first release sheet, the coating liquid of the above-described ruthenium-based adhesive composition was applied by a knife coater, and dried at 120 ° C for 10 minutes to obtain a thickness of 25 μm. The layer of adhesive. The peeling surface (second peeling surface) of the second release sheet is bonded to the main surface of the adhesive layer of the laminated body formed of the adhesive layer and the first release sheet, and the first release sheet is obtained. The adhesive-free layer and the second release sheet are sequentially laminated to form a substrate-free double-sided silicone.

In the baseless double-sided silicone obtained thereby, the main surface (low adhesion surface) of the adhesive layer exposed after peeling off the first release sheet is attached to the first glass substrate (manufactured by Corning Co., Ltd., product name: Eagle XG) One of the main surfaces is a laminate formed of the first release sheet, the adhesive layer, and the first glass substrate. Hereinafter, the laminate obtained by peeling off the first release sheet in the laminate is referred to as a "first laminate".

A film made of polyethylene terephthalate (PET) (thickness: 25 μm) which was not peeled off was used instead of the first release sheet, and the same application as described above was applied except that the coating liquid was applied to one main surface thereof. After the operation, a PET film, an adhesive layer, and a second release sheet were sequentially laminated. Hereinafter, the plaque glue is referred to as "the first 矽 single-sided glue".

[Comparative Example 1]

In the first embodiment, the coating liquid of the prepared ruthenium-based adhesive composition was applied onto a second glass substrate (manufactured by Corning Co., Ltd., product name: Eagle XG) by a spin coating method, and the obtained coating layer was applied. Heating at 120 ° C for 10 minutes, resulting in bonding A layered body formed of the agent layer and the second glass substrate. Hereinafter, this laminated body will be referred to as a "second laminated body".

[Test Example 1]

After the main surface of the adhesive layer was attached to the third glass substrate (product name: Eagle XG, manufactured by Corning Co., Ltd.), the first laminate and the second laminate obtained in the examples and the comparative examples were obtained. A laminated body in which two glass substrates are attached by an adhesive layer. In other words, a laminate in which the first glass substrate, the adhesive layer, and the third glass substrate are laminated in this order, and a laminate in which the second glass substrate, the adhesive layer, and the third glass substrate are laminated in this order are obtained. These laminates were allowed to stand in an environment of 200 ° C for 1 hour, and then subjected to heat treatment to cool to room temperature (23 ° C). After peeling off the third glass substrate for each laminated body after the heat treatment, it was observed whether or not the adhesive layer was adhered only to the third glass substrate.

After the above experiment was carried out 10 times, the number of times the adhesive layer was adhered only to the third glass substrate was totaled. The measurement results are shown in Table 1.

[Test Example 2]

In the first embodiment, after peeling off the second release sheet of the substrate-free double-sided silicone which was produced, the main surface (high adhesion surface) of the exposed adhesive layer was attached to the unpeeled poly(p-phenylene). On one main surface of a film of ethylene formate (PET) (thickness: 25 μm), a single-sided adhesive of a PET film, an adhesive layer, and a first release sheet was sequentially laminated. Hereinafter, this unilateral rubber is referred to as "second 矽 single-sided adhesive".

For each of the first one-sided rubber and the second single-sided adhesive, a single-sided tape was obtained by cutting into a rectangle having a length of 250 mm and a width of 25 mm. After peeling off the release sheet of each single-sided tape, the main surface of the exposed adhesive layer (the first side of the adhesive layer) Glue is a high-adhesive surface, and the second side of the single-sided adhesive is a low-adhesive surface. They are attached to the main surface of a glass substrate (manufactured by Corning Co., Ltd., product name: Eagle XG), and a PET film and adhesive are obtained. The adhesive layer formed on the layer and the glass substrate, and the adhesive force of the adhesive layer facing the surface of the glass substrate is different to obtain two kinds of laminated bodies. When each of the laminates was placed on the test bench, the PET film was placed upside down, and it was subjected to reciprocating pressurization using a 2 kg supercharger at 23 ° C and a relative humidity of 50%, and left for 24 hours as a peeling test. Use the sample. The peeling test sample thus obtained was subjected to a tensile tester (product name: TENSILON, manufactured by Orient Co., Ltd.) according to JIS Z0237:2009, and was subjected to a peeling speed of 300 mm/min and a peeling angle of 180°. The laminate formed of the adhesive layer and the PET film is peeled off on the glass substrate. Thus, the adhesion force (mN/25 mm) of the low adhesion surface or the high adhesion surface of the adhesive layer to the glass substrate was measured. The measurement results are shown in Table 2.

As shown in Tables 1 and 2, there are real conditions that can satisfy the conditions of the present invention. In the adhesive layer of the non-substrate double-sided silicone of the embodiment, the adhesive force of one main surface and the adhesive force of the other main surface are different, and the peeling controllability is excellent.

[Industrial availability]

Since the baseless double-sided silicone of the present invention is excellent in re-peeling controllability of the adhesive layer, it is preferably used when an ITO film is formed on a glass substrate.

10‧‧‧No substrate double-sided silicone

1‧‧‧Adhesive layer

1A‧‧‧ Main surface (low adhesion surface) laminated on the first peeling surface 2A of the adhesive layer 1

1B‧‧‧ Main surface (high adhesion surface) which is laminated on the second peeling surface 3A of the adhesive layer 1

2‧‧‧1st peeling piece

2A‧‧‧1st peeling surface

2a‧‧‧1st peeling treatment layer

2b‧‧‧1st support material

3‧‧‧2nd peeling piece

3A‧‧‧2nd peeling surface

3a‧‧‧2nd peeling treatment layer

3b‧‧‧2nd support material

Claims (3)

A non-substrate double-sided silicone having a structure in which a laminate is disposed, and a first release sheet, an adhesive layer formed of a ruthenium-based adhesive composition, and a second release sheet are disposed in this order. The difference between the adhesive strengths of the two main faces of the adhesive layer is 2 mN/25 mm or more and 20 mN/25 mm or less; and the adhesive force of the main surface having a high adhesive force in the adhesive layer is 700 mN/25 mm or less. The substrate-free double-sided silicone according to claim 1, wherein at least one of the first release sheet and the second release sheet is coated with a fluorine-based release agent on at least one main surface of the support. form. The non-substrate double-sided silicone according to claim 1 or 2, wherein the above-mentioned lanthanum adhesive composition comprises: an additional type of organic polyoxyl which contains an alkenyl group and a base group The ruthenium rubber having a olefin as a constituent component, and a platinum catalyst in an amount of 0.01 parts by mass or more and 3 parts by mass or less based on 100 parts by mass of the ruthenium rubber, and 15 parts by mass or more and 100 parts by mass or less based on 100 parts by mass of the ruthenium rubber. Resin.