Polysiloxane composition and adhesive components

Abstract

This invention requires an adhesive member having a polysiloxane adhesive layer with sufficient adhesion that prevents the removal of microelectronic components. Furthermore, it requires an adhesive member with adhesive properties that prevent sedimentation into the adhesive member, allow easy removal of electronic components, and minimize material migration to the fixed components during removal. The polysiloxane composition of this invention is cured by the reaction of vinyl groups with Si-H bonds, and contains: an addition-curing liquid polysiloxane comprising a vinyl group and a Si-H group, and an MQ polysiloxane resin; wherein the polysiloxane composition contains the addition-curing liquid polysiloxane and the MQ polysiloxane resin as main components, and the weight percentage of the MQ polysiloxane resin relative to the total weight of the addition-curing liquid polysiloxane and the MQ polysiloxane resin is 10% or more and 40% or less.

Description

Technical Field

[0001] This invention relates to a polysiloxane composition and an adhesive member having a polysiloxane adhesive layer formed by curing the polysiloxane composition. Prior Technology

[0002] When assembling electronic components or electronic parts (hereinafter referred to as "electronic parts, etc.") onto a substrate, there is a step of temporarily fixing the electronic parts, etc., to the adhesive surface of an adhesive tape (adhesive member) before transferring them to the substrate. In recent years, with the increasing performance of mobile electronic devices, the electronic parts, etc., have tended to be miniaturized, and there is a need to improve the adhesive members used in the transfer process. Conventionally, adhesive members with a polysiloxane adhesive layer are mostly used in this transfer process.

[0003] Patent documents 1 to 3 disclose examples of adhesive components having a polysiloxane adhesive layer.

[0004] For example, Patent Document 1 discloses an adhesive sheet for processing electronic components such as semiconductor wafers or wafers. This adhesive sheet holds the electronic components on a polysiloxane adhesive layer by contacting the laminate with an organic solvent.

[0005] Furthermore, Patent Document 2 discloses an addition-curing polysiloxane adhesive composition and its cured form that can be used for the temporary fixation of small objects. Because the addition-curing polysiloxane adhesive composition of Patent Document 2 does not contain any solid resin components unrelated to crosslinking, it possesses the advantages of sufficient adhesive strength as an adhesive for temporary fixation and minimal material migration.

[0006] On the other hand, Patent Document 3 discloses a protective film with a polysiloxane adsorption layer that can be easily and repeatedly applied to or peeled off the surface of a touchpad, etc., for protecting the surface of the touchpad. [Previous Technical Documents] [Patent Literature]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 2015-10116 [Patent Document 2] Japanese Patent Application Publication No. 2021-123620 [Patent Document 3] Japanese Patent Application Publication No. 2017-74701 Summary of the Invention

[0008] (The problem the invention aims to solve)

[0009] However, the size of the semiconductor electronic components held by the adhesive sheet used for processing electronic components in Patent Document 1 is about 5 mm to 10 mm. Therefore, as with the adhesive sheet in Patent Document 1, even if the adhesive force is about 800 millinewtons per 25 mm width, there is still a possibility that electronic components may not be embedded in the adhesive layer and may peel off from the surface of the adhesive layer.

[0010] However, if electronic components that are smaller than the electronic components assumed in Patent Document 1, approximately several micrometers to tens of micrometers in size, are temporarily fixed using the adhesive sheet of Patent Document 1, the electronic components become stuck in the adhesive layer due to the softness and strong adhesion of the adhesive, making it difficult to peel off the temporarily fixed electronic components.

[0011] Furthermore, while the addition-type polysiloxane adhesive composition of Patent Document 2 is suitable for the temporary fixation of semiconductor devices in the process of miniaturization, it is necessary to prepare a special cross-linked organic polysiloxane resin that participates in the cross-linking.

[0012] Furthermore, the polysiloxane absorbent sheet in Patent Document 3, because it has the function of protecting the surface of the touch panel with a protective film, does not seem to be designed for holding objects. Therefore, it does not have sufficient adhesive force to hold objects, and if used for temporary fixation of electronic components, there is a problem that the electronic components may fall off during transportation.

[0013] Furthermore, Patent Documents 1 and 3 envision situations where the material components of the adhesive migrate to electronic components, causing pollution.

[0014] Therefore, an adhesive component is required that possesses sufficient adhesion to temporarily fix and transport microelectronic components such as microLEDs with one side approximately 50 to 200 micrometers, chips, mini LEDs with one side less than 50 micrometers, and optical chips of image sensors, while maintaining sufficient adhesion to prevent these electronic components from peeling off during transport. Furthermore, an adhesive component is required that does not easily sink into the adhesive component, facilitates the peeling of electronic components, and prevents material migration into the fixed components during peeling. (Technical means to solve the problem)

[0015] A polysiloxane composition, cured by the reaction of vinyl groups with Si-H bonds, comprises: an addition-curing liquid polysiloxane containing vinyl groups and a polysiloxane containing Si-H bonds; and MQ polysiloxane resin; wherein the polysiloxane composition contains the addition-curing liquid polysiloxane and the MQ polysiloxane resin as main components, and the MQ polysiloxane resin is present in relation to the addition-curing liquid polysiloxane and the MQ polysiloxane resin. The total weight content of silicone resin is 10% or more and 40% or less; after the addition-curing liquid polysiloxane rubber is cured by monomers, the swelling degree of the addition-curing liquid polysiloxane rubber, as measured by the following swelling degree measurement method, is 350% or less; after curing, the polysiloxane composition becomes a polysiloxane adhesive with a Shore A hardness of 17 or more and 90 or less, and an adhesive force of 5.0 Newtons or more and 26.0 Newtons or less per 25 square millimeters. This polysiloxane composition solves the aforementioned conventional problems. (Compared to the effectiveness of previous technologies)

[0016] The polysiloxane composition of the present invention, after curing, becomes a polysiloxane adhesive having a Shore A hardness of 17 or higher and 90 or lower, and an adhesive strength of 5.0 Newtons or higher and 26.0 Newtons or lower per 25 square millimeters. This enables the achievement of adhesive properties that allow temporary fixation of microelectronic components smaller than 200 micrometers, prevent easy peeling from easily sinking into the adhesive component, and minimize migration of material components from the adhesive component. Simple Explanation of the Diagram

[0017] Figure 1 is a cross-sectional view showing the conceptual cut of the adhesive member of the first embodiment of the present invention. Figure 2 is a cross-sectional view showing the conceptual cut of the adhesive member of the second embodiment of the present invention. Figure 3 is a cross-sectional view showing the concept of the adhesive member of the third embodiment of the present invention. Figure 4 is a cross-sectional view showing the conceptual cut of the adhesive member of the fourth embodiment of the present invention. Implementation

[0018] (Basic Implementation Form) The following describes a polysiloxane composition based on a basic embodiment of the present invention. Furthermore, the cured polysiloxane composition is defined as a "polysiloxane adhesive".

[0019] The polysiloxane composition is formed by mixing addition-curing liquid polysiloxane rubber and MQ polysiloxane resin in a predetermined ratio as described below. The polysiloxane composition of this invention contains addition-curing liquid polysiloxane and MQ polysiloxane resin as main components. Furthermore, the term "main component" in this specification refers to the component that has a significant impact on the properties of this polysiloxane composition, and the component with the highest content (excluding fillers and solvents described later). The total content of addition-curing liquid polysiloxane and MQ polysiloxane resin in the polysiloxane composition exceeds 50% by weight, preferably 60% by weight or more, more preferably 75% by weight or more, and particularly preferably 95% by weight or more. It also includes cases where it contains 100% by weight.

[0020] The addition-curing liquid polysiloxane rubber of the present invention is representative of polysiloxane rubber having a framework mainly composed of two-dimensional siloxane bonds. Furthermore, the addition-curing liquid polysiloxane rubber is a polysiloxane rubber that cures through the reaction of vinyl groups with Si-H bonds, and is classified as an addition-curing liquid polysiloxane rubber containing vinyl groups and polysiloxanes containing Si-H bonds.

[0021] Addition-type liquid polysiloxane is cured by the reaction of vinyl groups with Si-H bonds. It includes a single-component type, which pre-complicates a vinyl-containing polysiloxane and a Si-H-bonded polysiloxane, and a two-component type, which is mixed with the vinyl-containing polysiloxane and the Si-H-bonded polysiloxane only during use. In this invention, it is preferable to use an addition-type liquid polysiloxane that cures uniformly during mixing. From a workability point of view, the single-component type is preferred; from a time-efficiency point of view, the two-component type is preferred.

[0022] Examples of addition-type liquid polysiloxane rubbers include: LSR7005, LSR7030, LSR7040, LSR7050, LSR7060, LSR7070FC, LSR7080, LSR7080J, and LSR7090 manufactured by Momentive Performance Materials Japan LLC; and MS-1001, MS-1002, and MS-1003 manufactured by Dow & Toray Industries.

[0023] Addition-curing liquid polysiloxane rubber can be used with one material containing addition-curing liquid polysiloxane rubber, or multiple materials containing addition-curing liquid polysiloxane rubber can be used in combination.

[0024] MQ polysiloxane resin is a polysiloxane resin with a three-dimensional siloxane bond backbone. Furthermore, in MQ polysiloxane resin, "M (unit)" represents R3SiO, and "Q (unit)" represents SiO4. Specifically, MQ polysiloxane resin is a polysiloxane resin composed of a combination of trialkylsiloxy units (M unit (R3SiO 1 / 2)) and tetrafunctional siloxy units [Q unit (SiO 4 / 2)].

[0025] The R group in the M unit represents an organic (containing C) substituent. Examples of R groups include hydrocarbon groups (especially alkyl groups), phenyl, benzoalkyl, or hydroxyl groups containing 1 to 10 carbon atoms. Among these, alkyl or hydroxyl groups containing 1 to 8 carbon atoms are preferred, and methyl or phenyl groups are even more preferred. All R groups may be the same or different.

[0026] Examples of MQ polysiloxane resins include: trimethylsilaneoxysilicic acid, trifluoroalkyl dimethyltrimethylsilaneoxysilicic acid, benzyl vinylsilaneoxysilicic acid, phenylpropyl dimethylsilaneoxysilicic acid, etc.

[0027] Examples of MQ polysiloxane resins include: SR545, SR1000, SS4230, and SS4267 manufactured by Momentive Performance Materials Japan LLC; KF-7312J, KF-9021, KM-9717, X-21-5249, X-21-5595, X-21-5616, X-52-8005, and X-51-1302M manufactured by Shin-Etsu Chemical Co., Ltd.; BY11-018 and BELSIL TMS 803 manufactured by Wacker Asahikasei Silicone Co., Ltd.; and MQ-1600 Solid Resin manufactured by Dow Toray Industries, Ltd. MQ polysiloxane resins can be used as a single material containing MQ polysiloxane resin, or multiple materials containing MQ polysiloxane resin can be used in combination.

[0028] The polysiloxane composition may also contain, without impairing the effects of the present invention, additives such as: colorants (pigments or dyes), adhesive additives, adhesive accelerators, polymerization terminators, antioxidants, ultraviolet absorbers (which are light stabilizers), light stabilizers, antistatic agents, peroxide-based curing agents, adhesion promoters, reaction modifiers, silane coupling agents, addition reaction control agents, fillers (described later), non-reactive polysiloxane compounds, polysiloxane rubber components other than addition-curing liquid polysiloxane rubber, polysiloxane resins other than MQ polysiloxane resin, polysiloxane oligomers, thermosetting resins, etc.

[0029] Reaction modifiers can be exemplified by: 1-ethynylcyclohexanol, 3,5-dimethyl-1-hexyn-3-ol, 3-methyl-1-butyn-3-ol, 1-phenyl-2-propyn-1-ol, etc.

[0030] Examples of silane coupling agents include: vinyltrimethoxysilane, vinyltriethoxysilane, 3-epoxypropoxypropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, etc.

[0031] Examples of addition reaction control agents include: hardening agents, addition reaction control agents used to impart pot life, and addition reaction retarders containing straight-chain or cyclic alkenyl groups.

[0032] Examples of polysiloxane adhesive components include polydimethylsiloxane adhesive. These polysiloxane adhesives can also be cross-linked. Polysiloxanes are, in most cases, polyorganosiloxanes having an organic group selected from alkyl, haloalkyl, aralkyl, alkenyl, aryl, alkoxy, or aryl groups substituted with halogen atoms. The represented organic group is not particularly limited, but examples include methyl, ethyl, and phenyl.

[0033] Examples of non-reactive polysiloxane compounds include: polysiloxane-based polysiloxane oils, polyether-modified polysiloxane oils, aralkyl-modified polysiloxane oils, fluoroalkyl-modified polysiloxane oils, long-chain alkyl-modified polysiloxane oils, higher fatty acid ester-modified polysiloxane oils, higher fatty acid amide-modified polysiloxane oils, and phenyl-modified polysiloxane oils.

[0034] Polysilicon resins other than MQ polysilicon resins may be used, such as MT polysilicon resin, MD polysilicon resin, MDT polysilicon resin, MDQ polysilicon resin, MTQ polysilicon resin, MDTQ polysilicon resin, etc., or mixtures thereof, or modified polysilicon resins. Examples of modified polysilicon resins include OH-modified polysilicon resins, vinyl-modified polysilicon resins, and phenyl-modified polysilicon resins.

[0035] Examples of thermosetting resins include: unsaturated polyester resins, thermosetting acrylic resins, thermosetting amine resins, thermosetting melamine resins, thermosetting urea resins, thermosetting ethyl carbamate resins, thermosetting oxy-resins, and thermosetting epoxy / oxy-resin composite resins.

[0036] There are no particular limitations on the manufacturing method of the relevant polysiloxane composition. It can be obtained by mixing and stirring the various components and other components as needed in any order.

[0037] Hereinafter, polysiloxane adhesive is defined as a cured polysiloxane composition, and polysiloxane adhesive can be used for adhesive components 1a to 1d in the embodiments described later.

[0038] Polysiloxane compositions can be used as polysiloxane adhesives for cured products. For example, a polysiloxane composition coated on a highly separable material and cured can form a cured polysiloxane adhesive. As used in this specification, "curing" refers to providing an elastomeric structure to the polysiloxane composition through crosslinking. When polymers undergo crosslinking, there are two types of crosslinking to bond the polymer chains together: chemical crosslinking using covalent bonds; and physical crosslinking using reversible interactions such as hydrophobic interactions, ionic interactions, hydrogen bonds, or non-covalent bonds like coordination bonds. From the viewpoint of strength and less volume change due to swelling, chemical crosslinking is preferred for the addition-cured liquid polysiloxane rubber of this invention. Furthermore, in addition to addition (hydrosilicification) crosslinking, crosslinking with organic peroxides can also be used. In order to harden the polysiloxane composition to form a polysiloxane adhesive, the polysiloxane composition can be selected for addition reaction hardening, for example, by an addition reaction of an addition-curing liquid polysiloxane rubber and a non-crosslinked MQ polysiloxane resin containing a platinum catalyst or similar crosslinking mechanism.

[0039] During addition reactions, it is best to use a crosslinking agent and a catalyst together.

[0040] The crosslinking agent is, for example, an organic polysiloxane having at least two hydrogen atoms bonded to silicon atoms in one molecule. Specific examples include: dimethylsiloxy-terminated dimethylsiloxane-methylsiloxane copolymer, trimethylsiloxy-terminated dimethylsiloxane-methylsiloxane copolymer, trimethylsiloxy-terminated methylhydropolysiloxane, poly(hydrosilsesquioxane), etc.

[0041] Catalysts that can be used include, for example, microparticle platinum, microparticle platinum adsorbed on a carbon powder carrier, platinum chloride, alcohol-modified platinum chloride, olefin complexes of platinum chloride, and platinum group metal compounds such as palladium and rhodium. Using such catalysts allows for more efficient hardening reactions. Examples of platinum catalysts include CAT-PL-50T manufactured by Shin-Etsu Chemical Co., Ltd., and DOWSIL (registered trademark) NC-25 or DOWSIL (registered trademark) SRX212 manufactured by Dow & Toray Industries, Ltd.

[0042] The amount of platinum-based catalyst should be sufficient to act as an effective catalyst and to allow for addition reaction hardening. It can be adjusted appropriately to match the desired hardening rate.

[0043] There are no particular limitations on the coating method for polysiloxane compositions. Appropriate methods can be selected from known coating methods such as spin coating, corner wheel coating, lip coating, roller coating, die coating, knife coating, doctor blade coating, bar coating, coincidence coating, gravure coating, screen coating, dip coating, and casting coating.

[0044] There are no particular limitations on the curing method of polysiloxane compositions; appropriate methods may be selected from, for example, heat curing, room temperature curing, ultraviolet curing, or combinations thereof.

[0045] When forming a polysiloxane composition, the content ratio of addition-cured liquid polysiloxane rubber to MQ polysiloxane resin can be defined as the weight percentage of MQ polysiloxane resin relative to the total weight of the addition-cured liquid polysiloxane rubber and the MQ polysiloxane resin. In the polysiloxane composition of this invention, the composition is prepared such that the weight percentage of MQ polysiloxane resin relative to the total weight of the addition-cured liquid polysiloxane rubber and the MQ polysiloxane resin is 10% or more and 40% or less.

[0046] Furthermore, from the viewpoint of excellent adhesion (dynamic bonding strength), the weight content of MQ polysiloxane resin relative to the combined weight of addition-cured liquid polysiloxane rubber and MQ polysiloxane resin in the polysiloxane composition is preferably 20% or more and 40% or less. Here, the weight content of addition-cured liquid polysiloxane rubber is the remainder after deducting the weight of MQ polysiloxane resin from the total weight of addition-cured liquid polysiloxane rubber and MQ polysiloxane resin (100%).

[0047] In this invention, the polysiloxane adhesive, after being cured from the polysiloxane composition, has appropriate adhesion to temporarily fix tiny electronic components onto a substrate. On the other hand, in order to form an adhesive property that does not sink into the adhesive component, in addition to the ratio of addition-cured liquid polysiloxane rubber to MQ polysiloxane resin, it is also necessary to properly control the crosslinking density of the addition-cured liquid polysiloxane rubber that forms the polysiloxane composition.

[0048] Furthermore, generally speaking, the crosslinking density of an adhesive composition depends on its swelling degree. That is, when the crosslinking density is high, even when immersed in toluene, the three-dimensionally crosslinked polymer chains constituting the adhesive are not easily extended, resulting in reduced swelling. On the other hand, when the crosslinking density is low, the polymer chains easily extend, increasing swelling. Therefore, the crosslinking density of the addition-cured liquid polysiloxane rubber forming the polysiloxane composition can be expressed by the swelling degree of the addition-cured liquid polysiloxane rubber forming the polysiloxane composition. In other words, to obtain a polysiloxane composition that has appropriate adhesion to temporarily fix tiny electronic components onto a substrate, and on the other hand, has adhesive properties that prevent it from sinking into the adhesive component, the swelling degree of the addition-cured liquid polysiloxane rubber monomers forming the polysiloxane composition after curing can be measured, and the crosslinking density of the addition-cured liquid polysiloxane rubber can be controlled accordingly.

[0049] The polysiloxane composition containing addition-cured liquid polysiloxane rubber is formulated such that the swelling ratio of the cured adhesive component is below 350%. More preferably, the swelling ratio is below 300%.

[0050] Here, swelling is defined as follows: It refers to a sample of addition-curing liquid polysiloxane monomer prepared as a square (50mm × 50mm) swelling test piece, 50 micrometers thick and 50 mm on each side (50mm square). Here, the swelling test piece refers to a sample that only cures the addition-curing liquid polysiloxane. The swelling ratio defined in this invention is the toluene absorption amount converted from immersing the sample in toluene for one day at 23 degrees Celsius and 50% humidity, with the mass of the insoluble portion set as 100%. Here, the following variables are defined: A: Initial mass of the sample (test piece for determining the swelling of polysiloxane rubber). B: Mass of the sample (test piece for determining the swelling of polysiloxane rubber) after being impregnated with toluene. C: Drying mass of the sample (test piece for determining the swelling of polysiloxane rubber) after being impregnated with toluene and dried at 130 degrees Celsius (°C) for 2 hours. Therefore, swelling (%) is defined as the value calculated by the following formula: Swelling degree (%) = B / {A(×C / A)}×100%

[0051] Furthermore, in the addition-cured liquid polysiloxane rubber monomers that form the polysiloxane composition of the present invention, the cured Shore hardness A (JIS K6253) is preferably in the range of 25 to 90 from the viewpoint of inhibiting the deposition of electronic components into the adhesive components. When multiple addition-cured liquid polysiloxane rubbers are blended, the cured Shore hardness A of the blend is measured.

[0052] Polysiloxane compositions can further contain fillers. By including fillers, polysiloxane compositions generally possess the advantage of easily adjusting their elastic modulus, dimensional stability, yield point strength, elongation at break, and other physical properties. Examples of fillers include inorganic and organic fillers. Representative shapes of fillers include spherical, needle-like, and fragmented forms. One type of filler can be selected, or two or more fillers can be included.

[0053] Inorganic fillers can be composed of materials such as crystalline silica, amorphous silica, polysiloxane powder, wollastonite, talc, aluminum hydroxide, magnesium hydroxide, calcium carbonate, magnesium carbonate, calcium silicate, magnesium silicate, calcium oxide, magnesium oxide, aluminum oxide, aluminum nitride, aluminum borate whiskers, and boron nitride. Besides monomeric metals such as aluminum, gold, silver, copper, and nickel, inorganic fillers can also be composed of materials such as alloys, amorphous carbon, and graphite. On the other hand, organic fillers can be composed of materials such as polymethyl methacrylate (PMMA), polyimide, polyamide-imide, polyetheretherketone, polyether-imide, and polyester-imide. Furthermore, from the viewpoint of excellent colorless transparency, silicone and polysiloxane powder can also be selected as fillers.

[0054] The polysiloxane composition prepared in this way, after curing, exhibits the following characteristics as a polysiloxane adhesive: a Shore A hardness of 17 or higher and 90 or lower, and an adhesive force of 5.0 Newtons or higher and 26.0 Newtons or lower per 25 square millimeters. Furthermore, this polysiloxane adhesive also possesses the following characteristics: an adhesive force to float glass of 0.02 Newtons or higher and 0.75 Newtons or lower per approximately 1 centimeter, and a polysiloxane migration amount measured by fluorescence X-ray analysis of less than 1 microgram per square centimeter.

[0055] Next, the aforementioned properties of the polysiloxane adhesive obtained after curing the polysiloxane composition prepared accordingly will be described with reference to Tables 1 to 3, specifically Examples 1 to 9 suitable for the present invention and Comparative Examples 1 to 6 using unsuitable samples. Table 1 lists Examples 1 to 9, Table 2 lists Comparative Examples 1 to 4, and Table 3 lists Comparative Examples 5 and 6.

[0056] The samples in Examples 1 to 9 were addition-cured liquid polysiloxane monomers belonging to the polysiloxane composition, prepared to have a swelling degree of 350% or less as measured by the following swelling degree determination method. That is, the samples were addition-cured liquid polysiloxanes that harden through the reaction of vinyl groups with Si-H bonds and contained: vinyl-containing polysiloxanes and Si-H-containing polysiloxanes, prepared to have a swelling degree of 350% or less. The compositions of the polysiloxane compositions in Examples 1 to 9 are as follows.

[0057] Example 1 uses Momentive Advanced Materials' trade name LSR7060 as the addition-curing liquid polysiloxane rubber and Momentive Advanced Materials' SR545 as the MQ polysiloxane resin. In Example 1, when the addition-curing liquid polysiloxane rubber is set to 100% by mass, the MQ polysiloxane resin is prepared to be 42.9% by mass. In Example 1, the weight content of MQ polysiloxane resin relative to the total weight of the addition-curing liquid polysiloxane rubber and MQ polysiloxane resin is prepared to be 30%.

[0058] Example 2 is the same as Example 1, except that Momentive Prop Industries' trade name LSR7060 is selected as the addition-curing liquid polysiloxane rubber, and Momentive Prop Industries' SR545 is selected as the MQ polysiloxane resin. In Example 2, when the addition-curing liquid polysiloxane rubber is set to 100% by mass, the MQ polysiloxane resin is prepared to be 25.0% by mass. In Example 2, the weight content of MQ polysiloxane resin relative to the total weight of the addition-curing liquid polysiloxane rubber and MQ polysiloxane resin is prepared to be 20%.

[0059] Example 3 is the same as Example 1, except that Momentive Prop Industries' trade name LSR7060 is selected as the addition-curing liquid polysiloxane rubber, and Momentive Prop Industries' SR545 is selected as the MQ polysiloxane resin. In Example 3, when the addition-curing liquid polysiloxane rubber is set to 100% by mass, the MQ polysiloxane resin is prepared to be 66.7% by mass. In Example 3, the weight content of MQ polysiloxane resin relative to the total weight of the addition-curing liquid polysiloxane rubber and MQ polysiloxane resin is prepared to be 40%.

[0060] Example 4 is the same as Example 1, except that Momentive Prop Industries' trade name LSR7060 is selected as the addition-curing liquid polysiloxane rubber, and Momentive Prop Industries' SR545 is selected as the MQ polysiloxane resin. In Example 4, when the addition-curing liquid polysiloxane rubber is set to 100% by mass, the MQ polysiloxane resin is prepared to be 11.1% by mass. In Example 4, the weight content of MQ polysiloxane resin relative to the total weight of the addition-curing liquid polysiloxane rubber and MQ polysiloxane resin is prepared to be 10%.

[0061] In Example 5, Momentive Advanced Materials' trade name LSR7030 was selected as the addition-curing liquid polysiloxane rubber, and Momentive Advanced Materials' SR545 was selected as the MQ polysiloxane resin. In Example 5, when the addition-curing liquid polysiloxane rubber was set to 100% by mass, the MQ polysiloxane resin was prepared to be 42.9% by mass. In Example 5, the weight content of MQ polysiloxane resin relative to the total weight of the addition-curing liquid polysiloxane rubber and MQ polysiloxane resin was adjusted to 30%.

[0062] In Example 6, Momentive Advanced Materials' trade names LSR7060 and LSR7005 were selected as addition-curing liquid polysiloxane rubbers, and Momentive Advanced Materials' SR545 was selected as the MQ polysiloxane resin. In Example 6, when LSR7060 and LSR7005 of the addition-curing liquid polysiloxane rubbers were each set to 50% by mass (total 100% by mass), the MQ polysiloxane resin was prepared to be 42.9% by mass. In Example 6, the weight content of MQ polysiloxane resin relative to the total weight of the addition-curing liquid polysiloxane rubber and MQ polysiloxane resin was prepared to be 30%.

[0063] In Example 7, Momentive Advanced Materials' trade names LSR7060 and LSR7005 were selected as addition-curing liquid polysiloxane rubbers, and Momentive Advanced Materials' SR545 was selected as the MQ polysiloxane resin. In Example 7, when LSR7060 of the addition-curing liquid polysiloxane rubber was set to 70% by mass and LSR7005 was set to 30% by mass (total 100% by mass), the MQ polysiloxane resin was prepared to be 42.9% by mass. In Example 7, the weight content of MQ polysiloxane resin relative to the total weight of addition-curing liquid polysiloxane rubber and MQ polysiloxane resin was prepared to be 30%.

[0064] In Example 8, Momentive Prop Industries' trade name 7080J was selected as the addition-curing liquid polysiloxane rubber, and Momentive Prop Industries' SR545 was selected as the MQ polysiloxane resin. In Example 8, when the addition-curing liquid polysiloxane rubber was set to 100% by mass, the MQ polysiloxane resin was prepared to be 42.9% by mass. In Example 8, the weight content of MQ polysiloxane resin relative to the total weight of the addition-curing liquid polysiloxane rubber and MQ polysiloxane resin was prepared to be 30%.

[0065] In Example 9, Momentive Advanced Materials' trade name LSR7060 was selected as the addition-curing liquid polysiloxane rubber, and Momentive Advanced Materials' SR545 was selected as the MQ polysiloxane resin, the same as in Example 1. Example 9 also follows the same pattern as Example 1, where the addition-curing liquid polysiloxane rubber was set to 100% by mass, and the MQ polysiloxane resin content was adjusted to 42.9% by mass. In Example 9, the weight percentage of MQ polysiloxane resin relative to the total weight of the addition-curing liquid polysiloxane rubber and MQ polysiloxane resin was adjusted to 30%. In addition to being the same as in Example 1, Example 9 further contains a filler; where the addition-curing liquid polysiloxane rubber was set to 100% by mass, the filler content was adjusted to 1.4% by mass.

[0066] In the addition-curing liquid polysiloxane rubber contained in the polysiloxane compositions corresponding to the polysiloxane adhesives of Examples 1 to 9, a platinum catalyst was pre-added. Examples 1 to 9 were formulated such that the weight content of the above-mentioned MQ polysiloxane resin relative to the addition-curing liquid polysiloxane rubber and the total weight of MQ polysiloxane resin was 10% or more and 40% or less, and the swelling of the addition-curing liquid polysiloxane rubber, after being cured by monomers, was 350% or less, as measured by the swelling determination method described below.

[0067] On the other hand, the samples of Comparative Examples 1 to 6 were prepared using addition-cured liquid polysiloxanes, which are components of polysiloxane compositions, and were cured by reacting vinyl groups with Si-H bonds. These samples were prepared by curing the addition-cured liquid polysiloxanes containing vinyl groups and Si-H bonds with monomers, and the swelling degree measured according to the following swelling degree determination method exceeded 350%. The compositions of the polysiloxane compositions of Comparative Examples 1 to 6 are as follows.

[0068] In Comparative Example 1, Momentive Advanced Materials' trade name LSR7060 was selected as an addition-curing liquid polysiloxane rubber, but it did not contain MQ polysiloxane resin. Comparative Example 1 means that the weight content of MQ polysiloxane resin relative to the total weight of addition-curing liquid polysiloxane rubber and MQ polysiloxane resin is 0%.

[0069] In Comparative Example 2, Momentive Advanced Materials' trade name LSR7060 was selected as the addition-curing liquid polysiloxane rubber, and Momentive Advanced Materials' SR545 was selected as the MQ polysiloxane resin. In Comparative Example 2, when the addition-curing liquid polysiloxane rubber was set to 100% by mass, the MQ polysiloxane resin was prepared to be 100% by mass. In Comparative Example 2, the weight content of MQ polysiloxane resin relative to the total weight of the addition-curing liquid polysiloxane rubber and MQ polysiloxane resin was prepared to be 50%.

[0070] In Comparative Example 3, Momentive Advanced Materials' trade names LSR7060 and LSR7005 were selected as addition-curing liquid polysiloxane rubbers, and Momentive Advanced Materials' SR545 was selected as the MQ polysiloxane resin. In Comparative Example 3, when LSR7060 of the addition-curing liquid polysiloxane rubber was set to 30% by mass and LSR7005 was set to 70% by mass (total 100% by mass), the MQ polysiloxane resin was prepared to be 42.9% by mass. In Comparative Example 3, the weight content of MQ polysiloxane resin relative to the total weight of addition-curing liquid polysiloxane rubber and MQ polysiloxane resin was prepared to be 30%.

[0071] In Comparative Example 4, Momentive Advanced Materials' trade name LSR7005 was selected as the addition-curing liquid polysiloxane rubber, and Momentive Advanced Materials' SR545 was selected as the MQ polysiloxane resin. In Comparative Example 4, when the addition-curing liquid polysiloxane rubber was set to 100% by mass, the MQ polysiloxane resin was prepared to be 42.9% by mass. In Comparative Example 4, the weight content of MQ polysiloxane resin relative to the total weight of the addition-curing liquid polysiloxane rubber and MQ polysiloxane resin was prepared to be 30%.

[0072] In Comparative Examples 1-4, platinum catalyst was added to addition-type liquid polysiloxane rubber in advance.

[0073] In Comparative Example 5, the addition-curing liquid polysiloxane rubber pre-added with MQ polysiloxane resin was selected from SD-4560 (trade name, manufactured by Dow Toray) with a solids concentration of 60% by mass and SD-4587L with a solids concentration of 40% by mass, with NC-25 (trade name, manufactured by Dow Toray) added as a platinum catalyst. In Comparative Example 5, when SD-4560 of the addition-curing liquid polysiloxane rubber was set to 60% by mass and SD-4587L was set to 40% by mass (total 100% by mass), the NC-25 platinum catalyst (manufactured by Dow Toray) was adjusted to 1.8% by mass.

[0074] In Comparative Example 6, the addition-curing liquid polysiloxane rubber pre-added with MQ polysiloxane resin was selected as SD-4560 (trade name, manufactured by Dow Toray) with a solids concentration of 60% by mass, and NC-25 (trade name, manufactured by Dow Toray) was added as a platinum catalyst. In Comparative Example 6, when SD-4560 of the addition-curing liquid polysiloxane rubber was set to 100% by mass, the NC-25 platinum catalyst (manufactured by Dow Toray) was adjusted to 1.5% by mass.

[0075] The samples of Examples 1 to 9 and Comparative Examples 1 to 4 were made into adhesive tapes in the form of adhesive components described later, using polysiloxane adhesive formed by curing polysiloxane compositions.

[0076] As shown in Tables 1 and 2, a polysiloxane composition was prepared by mixing polysiloxane resin, filler, toluene (diluent), and ethyl acetate (diluent) at a predetermined content ratio (by weight) relative to 100 parts by weight of polysiloxane rubber solids. Following the above procedure, the polysiloxane composition was coated onto polyimide. To remove the diluent and facilitate crosslinking, it was dried at 170°C and cured to form a polysiloxane adhesive. The coating amount of the polysiloxane composition was controlled so that the cured polysiloxane adhesive film thickness was 30 micrometers. A PET release liner, which is a polyethylene terephthalate resin release film (PET resin release film), was bonded onto the polysiloxane adhesive and aged at 40°C for 3 days.

[0077] Furthermore, the swelling test samples of Examples 1-9 and Comparative Examples 1-4 were prepared by first mixing the same polysiloxane rubber, toluene (diluent), and ethyl acetate (diluent) as described above, and then coating the mixture onto a PET release liner. To remove the diluent and facilitate cross-linking, the mixture was dried at 170°C to form the test composition. Next, a PET release liner was bonded to the test composition, and the mixture was aged at 40°C for 3 days to obtain the swelling test sample. The coating amount of the swelling test sample was controlled so that the film thickness of the cured swelling test sample was 50 micrometers.

[0078] Comparative Examples 5 and 6 were prepared by mixing one or two addition-curing polysiloxane adhesive stock solutions with a predetermined solid content, toluene (diluent), and ethyl acetate (diluent) in the proportions shown in Table 3 (by weight) to form a polysiloxane composition. Following the above procedure, the polysiloxane composition was coated onto polyimide, and then dried at 150°C to remove the diluent and facilitate cross-linking, thus forming a polysiloxane adhesive. The coating amount of the polysiloxane composition was controlled so that the film thickness of the cured polysiloxane adhesive was 30 micrometers.

[0079] The swelling test samples for Comparative Examples 5 and 6 were prepared by mixing the same addition-curing polysiloxane adhesive stock solution, toluene (diluent), and ethyl acetate (diluent) as described above at a predetermined content ratio (by weight), then coating it onto a PET release liner. To remove the diluent and to allow cross-linking, the mixture was dried at 150°C to form the test composition. As described above, a PET release liner was then bonded to the test composition to obtain the swelling test sample. The coating amount of the swelling test sample was controlled so that the film thickness of the cured swelling test sample was 50 micrometers.

[0080] The swelling determination of Examples 1-9 and Comparative Examples 1-4 was performed using addition-curing liquid polysiloxane monomer samples prepared as square (50mm × 50mm) swelling determination test pieces with a thickness of 50 micrometers and one side of 50 millimeters (50mm square corners). The swelling ratio defined in this invention is defined as the amount of toluene absorbed after immersing the sample in toluene for 1 day at a temperature of 23 degrees Celsius and a humidity of 50%, with the insoluble mass set as 100%. Here, the following variables are defined: A: Initial mass of the sample (test piece for determining the swelling of polysiloxane rubber). B: Mass of the sample (test piece for determining the swelling of polysiloxane rubber) after being impregnated with toluene. C: The dry mass of the sample (test piece for determining the swelling of polysiloxane rubber) after being impregnated with toluene and dried at 130 degrees Celsius (°C) for 2 hours. Furthermore, swelling (%) is defined as the value calculated by the following formula: Swelling degree (%) = B / {A(×C / A)}×100%

[0081] Furthermore, the swelling properties of Comparative Examples 5 and 6 were determined by pre-compiling polysiloxane rubber and MQ polysiloxane resin, after the polysiloxane adhesive was hardened and then washed with toluene, and the polysiloxane rubber composition after removing the MQ polysiloxane resin was used for measurement (comparative). The swelling determination of Comparative Examples 5 and 6 was also performed in the same manner as described above, using addition-curing liquid polysiloxane monomer samples prepared as square (50mm × 50mm) swelling determination test pieces with a thickness of 50 micrometers and one side of 50 millimeters (50mm square corners). The swelling ratio is defined as the amount of toluene absorbed by immersing the sample in toluene for 1 day at a temperature of 23 degrees Celsius and a humidity of 50%, with the insoluble mass set as 100%. Here, the following variables are defined: A: Initial mass of the sample (test piece for determining the swelling degree of polysiloxane adhesives). B: Mass of the sample (test piece for determining the swelling of polysiloxane rubber) after being impregnated with toluene. C: The dried mass of the sample (test piece for determining the swelling of polysiloxane (polysiloxane monomer)) after being impregnated with toluene and dried at 130 degrees Celsius (°C) for 2 hours. Therefore, swelling (%) is defined as the value calculated by the following formula: Swelling degree (%) = B / {A(×C / A)}×100%

[0082] The Shore hardness A test materials of Examples 1-9 and Comparative Examples 1-4 were prepared by placing the prepared polysiloxane composition in an aluminum cup No. 3, pre-drying it thoroughly at room temperature and 60°C, then performing a crosslinking reaction at 170°C, and aging it at 40°C for 3 days to obtain the polysiloxane adhesive used as a test material for Shore hardness A determination. Here, the coating amount of the polysiloxane composition was controlled so that the film thickness of the cured polysiloxane adhesive was 6 mm to 10 mm. Furthermore, the Shore hardness A test materials of Comparative Examples 5 and 6 were prepared by placing the prepared polysiloxane composition in an aluminum cup No. 3, pre-drying it thoroughly at room temperature and 60°C, and then performing a crosslinking reaction at 150°C to obtain the polysiloxane adhesive used as a test material for Shore hardness A determination. Here, the coating amount of the polysiloxane composition was controlled so that the film thickness of the cured polysiloxane adhesive was 3 mm to 5 mm. Two sheets of the polysiloxane adhesive (total thickness 6 mm to 10 mm) were overlapped and used as the sample for the Shore A hardness test. The Shore A hardness was measured according to JIS K6253 using a Shore hardness tester (TECLOCK GS-719G).

[0083] Furthermore, the evaluation values ​​in Tables 1 and 2 are as follows. "MQ polysiloxane content" refers to the amount when "polysiloxane rubber weight" is set to 100. Also, in these tables, "MQ polysiloxane resin weight content" refers to the weight ratio of MQ polysiloxane resin relative to the total amount of polysiloxane rubber and MQ polysiloxane resin, when the total amount is set to 100%. If the weight content of MQ polysiloxane resin is 30%, it means the weight content of polysiloxane rubber is 70%. The swelling error is estimated to be approximately + / - 10%.

[0084] [Table 1] Product Name Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Polysiloxane weight A-1 100.0 100.0 100.0 100.0 50.0 70.0 100.0 A-2 100.0 A-3 100.0 A-4 50.0 30.0 MQ polysiloxane weight B-1 42.9 25.0 66.7 11.1 42.9 42.9 42.9 42.9 42.9 MQ polysiloxane content by weight (%) 30.0 20.0 40.0 10.0 30.0 30.0 30.0 30.0 30.0 Swelling of polysiloxane monomers (%) 203.0 203.0 203.0 203.0 254.0 284.0 233.0 173.0 203.0 Filler content 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.4

[0085] [Table 2] Product Name Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Polysiloxane weight A-1 100.0 100.0 30.0 A-4 70.0 100.0 MQ polysiloxane weight B-1 0.0 100.0 42.9 42.9 MQ polysiloxane content by weight (%) 0.0 50.0 30.0 30.0 Swelling of polysiloxane monomers (%) 203.0 203.0 369.0 564.0 Filler content 0.0 0.0 0.0 0.0

[0086] In Tables 1 and 2, A-1 to A-4 and B-1 are as follows. (A-1) Addition-curing liquid polysiloxane rubber (trade name LSR7060, manufactured by Momentive Advanced Materials) (A-2) Addition-curing liquid polysiloxane rubber (trade name LSR7030, manufactured by Momentive Advanced Materials) (A-3) Addition-curing liquid polysiloxane rubber (trade name LSR7080J, manufactured by Momentive Advanced Materials) (A-4) Addition-curing liquid polysiloxane rubber (trade name LSR7005, manufactured by Momentive Advanced Materials) (B-1) MQ polysiloxane (trade name SR545, manufactured by Momentive Advanced Materials)

[0087] [Table 3] Comparative Example 5 Comparative Example 6 Addition-curing polysiloxane adhesive (S1) 60.0 100.0 Addition-curing polysiloxane adhesive (S2) 40.0 0.0 Catalyst C (concentrate) 1.8 1.5 Swelling of polysiloxane monomers (%) 564.0 587.0 Filler content 0.0 0.0

[0088] In Table 3, S1, S2 and catalyst C are as follows. (S1) Addition-curing polysiloxane adhesive (trade name SD-4560, manufactured by Dow & Toray) solids concentration 60% by mass (S2) Addition-curing polysiloxane adhesive (trade name SD-4587L, manufactured by Dow & Toray) solids concentration 40% by mass (Catalyst C) Platinum Catalyst (trade name NC-25, manufactured by Dow & Toray)

[0089] Next, referring to Tables 4 and 5, the main characteristics of the hardened products formed from the samples of Examples 1 to 9 and Comparative Examples 1 to 6 will be described.

[0090] [Table 4] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Shore Hardness A 58.0 58.0 53.0 60.0 21.0 28.0 32.0 82.0 56.0 Adhesion (Load capacity per 25 square millimeters (N)) 14.59 11.07 25.73 5.71 10.80 7.85 7.70 10.09 11.49 Adhesion of float glass (Load capacity per 1 cm radius (N)) 0.19 0.05 0.74 0.02 0.31 0.04 0.09 0.27 0.22 Polysiloxane migration (μg / 1cm²) 0.67 0.67 0.74 0.65 0.78 0.85 0.79 0.74 0.69

[0091] [Table 5] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Shore Hardness A 61.0 50.0 15.0 5.0 3.0 Less than 0.1 Adhesion (Load capacity per 25 square millimeters (N)) 2.25 26.28 7.56 8.85 10.93 24.37 Adhesion of float glass (Load capacity per 1 cm radius (N)) 0.01 2.14 0.03 0.05 0.65 1.71 Polysiloxane migration (μg / 1cm²) 0.54 0.78 0.93 1.00 0.84 0.75

[0092] The evaluation objects and the values ​​are measured according to the following description. The polysiloxane composition of the present invention has been found to have adhesive properties that can temporarily fix microelectronic components, etc., and can be easily peeled off without sinking into the adhesive component and are not prone to material migration from the adhesive component. (a) The Shore hardness A of the polysiloxane adhesive is determined according to JIS K6253. Shore hardness A is a hardness index mostly used when measuring the hardness of soft materials such as rubber and elastomers. If the Shore hardness A of the polysiloxane composition is less than 17, there is a possibility that electronic components or the like may sink into the formed adhesive component.

[0093] (b) The adhesive strength of the polysiloxane adhesive is defined as the so-called "dynamic adhesion force," which is the force required to peel off when a tensile load is applied perpendicular to one side of the test specimen. Specifically, a 25 square millimeter test specimen is adhered to a stainless steel fixture with the adhesive side facing down. The substrate side is fixed to a glass plate using double-sided tape (Made by Teraoka Seisakusho, No. 7641#75). A pressing load of 5 MPa is applied for 1 minute, and the specimen is then subjected to a curing period of 30 minutes to 1 hour. The test is conducted using a Strograph EL instrument manufactured by Toyo Seiki Co., Ltd. A tensile force was applied to the entire test specimen at a speed of 50 mm / min in the direction perpendicular to the surface of the test specimen to obtain a load-displacement curve. The maximum load and the displacement (in millimeters) at the point where the test specimen peels off from the clamping part were determined from the obtained curve, and the load capacity (in Newtons) per 25 square millimeters was obtained.

[0094] (c) The adhesion of the polysiloxane adhesive to float glass is the value obtained by testing a float glass sheet with a spun surface obtained from TEST-PIECE in Japan in accordance with JIS Z 0237:2000. The value is based on float glass and is determined by the load (Newtons) that the sample can withstand for every 1 cm of peeling from the float glass.

[0095] (d) The migration amount of polysiloxane components obtained by fluorescence X-ray analysis of the polysiloxane adhesive is the amount of polysiloxane components measured in the residue on a given sample, and is measured as follows. First, a strip of polysiloxane adhesive with a thickness of 30 micrometers and a size of 30 mm × 50 mm is adhered to a biaxially extended PET film (Toray LUMIRROR (registered trademark) S-10#50). While applying a 2 kg load to the roller, the roller is pressed back and forth once to obtain the test sample before peeling. The test sample before peeling is then subjected to a curing time of 20 minutes to 40 minutes at 23 degrees Celsius and 50% humidity. The strip of polysiloxane components is peeled off at a tensile speed of 300 mm per minute and a peel angle of 180 degrees to obtain the PET film belonging to the test sample after peeling. For the bonding surface of the PET film, the amount of Si present per unit area in a circle with a diameter of 30 mm was measured using a fluorescence X-ray analysis device, and the X-ray intensity [X-ray photon counts per second (cps)] was obtained.

[0096] The polysiloxane content (polysiloxane migration) of the PET film [mass per square centimeter (µg)] (μg / cm²) was calculated from the X-ray intensity (cps) of the pressed surface of the obtained PET film, converted to polydimethylsiloxane. The conversion is based on (100 kcps = 0.60 g / m²). Furthermore, the polysiloxane migration was measured using an EDX-7000 fluorescence X-ray analyzer (RIGAKU Corporation), with a rhodium (Rh) X-ray source. The output was set to 15 kV, 100 μA, and the X-ray intensity was measured.

[0097] As a result of this study, the samples from Examples 1 to 9 all met the required results. On the other hand, the samples from Comparative Examples 1 to 6 did not all meet the requirements; at least some of them did not. That is, if the weight content of the above-mentioned MQ polysiloxane resin relative to the addition-curing liquid polysiloxane rubber and the above-mentioned MQ polysiloxane resin is 10% or more and 40% or less, and the polysiloxane composition, after the addition-curing liquid polysiloxane rubber is cured by monomers, has a swelling degree of less than 350% as measured by the following swelling degree measurement method, then the following characteristics can be achieved.

[0098] In particular, comparative examples of polysiloxane adhesives in which the content ratio of polysiloxane rubber to MQ polysiloxane resin and the swelling degree were not within the above-mentioned suitable range were found to have the following problems. (a) Comparative Examples 3-6 confirmed that the Shore hardness A was particularly low. When this sample is used to fix microelectronic components, there is a possibility that the microelectronic components may sink into the adhesive component. (b) Comparative Example 1 confirmed the problem of excessively low adhesion, while Comparative Example 2 confirmed the problem of excessively high adhesion. (c) Comparative Example 1 confirmed the problem of low adhesion to the float glass reference, while Comparative Examples 2 and 6 confirmed the problem of high adhesion to the float glass reference. (d) In particular, in Comparative Examples 3 to 4, the migration amount of polysiloxane rubber was around 1 microgram per square centimeter, and there were also cases where it exceeded 1 microgram.

[0099] On the other hand, the samples from Examples 1 to 9, in which the content ratio of polysiloxane rubber to MQ polysiloxane resin and the swelling degree were all within the aforementioned suitable range, exhibited the following characteristics in the polysiloxane composition. These characteristics include the expected adhesive properties of being able to temporarily fix electronic components smaller than 200 micrometers, not easily sinking into the polysiloxane adhesive, being easily peelable, and not migrating from the polysiloxane adhesive. (a) Polysiloxane adhesives can achieve a Shore A hardness of 17 or higher and 90 or lower. (b) The adhesion of the polysiloxane adhesive (the so-called "dynamic adhesion") can reach more than 5.0 Newtons and less than 26.0 Newtons per 25 square millimeters. (c) The adhesion of the polysiloxane adhesive to float glass is comparable to the reference adhesion of float glass, achieving an adhesion of more than 0.02 Newtons and less than 0.75 Newtons per centimeter. (d) The amount of polysiloxane migration of the polysiloxane adhesive, as determined by fluorescence X-ray analysis, can reach less than 1 microgram per square centimeter.

[0100] The polysiloxane adhesive of the hardened polysiloxane composition belonging to the above basic embodiments can be used as, for example, the adhesive member 1a of the first embodiment to the adhesive member 1d of the fourth embodiment as described below.

[0101] (First Implementation) Continuing with the basic embodiment of the present invention, the adhesive member 1a of the first embodiment of the present invention will be described. FIG1 is a cross-sectional view showing the conceptual cross-section of the adhesive member of the first embodiment of the present invention.

[0102] The adhesive member 1a is formed from a polysiloxane adhesive layer 2, which is a polysiloxane adhesive layer used to harden the polysiloxane composition of the basic embodiment. The adhesive member 1a of the first embodiment may be composed solely of the polysiloxane adhesive layer 2. The polysiloxane adhesive layer 2 may include adhesive sheets or adhesive tapes in the form of thin plates or tapes with two sides.

[0103] The adhesive member 1a may also be provided with a release liner 11 on the polysiloxane adhesive layer 2. In this form, the release liner 11 is formed by the polysiloxane adhesive layer 2 having two main surfaces 2a and 2b, and is configured to contact one or both of the two main surfaces 2a and 2b.

[0104] The material of the release liner 11 is represented by polyethylene terephthalate (PET), but it can be freely selected from resin films of materials with high separability from polysiloxane compositions.

[0105] (Second Implementation) Next, the adhesive member 1b of the second embodiment of the present invention will be described with reference to FIG2. Here, the adhesive member 1b of the second embodiment of the present invention will be described in terms of the differences from the first embodiment. Except for the main parts, the parts that are the same as those in the first embodiment will not be described again.

[0106] The adhesive member 1b in the second embodiment has the following form: a polysiloxane adhesive layer 2 and a substrate 3 belonging to the support of the polysiloxane adhesive layer 2. The substrate 3 may be configured to have at least one main surface 3a.

[0107] The polysiloxane adhesive layer 2 is, in the same manner as in the first embodiment, a cured product of the polysiloxane composition. The polysiloxane composition also has the exact same structure as in the first embodiment.

[0108] In the second embodiment of the present invention, the adhesive member 1b can also be configured as a thin plate having two main surfaces 2a and 2b, such as a sheet or tape, of polysiloxane adhesive layer 2. The adhesive member 1b includes an adhesive sheet or adhesive tape that can be used for temporary fixation of microelectronic components.

[0109] The substrate 3 is not particularly limited, and representative examples include: film, non-woven fabric, foam, cloth, paper, and combinations thereof. Preferably, the substrate 3 is a film-like material with uniform thickness that can be easily obtained during thin substrate manufacturing processes. Furthermore, it is particularly preferably a resin film with the heat resistance necessary for its application environment.

[0110] When the substrate 3 is in the form of a resin film, the substrate 3 is a support body in the shape of a film with at least one main surface 3a. The main surface 2a is formed on one side of the polysiloxane adhesive layer 2, and the polysiloxane adhesive layer 2 is disposed on the substrate 3 in such a way that the main surface 2a contacts the main surface 3a of the substrate 3.

[0111] Specific examples of resin materials for the resin film used as substrate 3 include: polyesters such as polyimide (PI), polyamide (PA), polyetheretherketone (PEEK), polyethylene terephthalate (PET), or polyethylene terephthalate (PEN); resin films such as polyphenylene sulfide (PPS), polyamide-imide (PAI), polyether sulfide (PES); and fluoropolymers (PTFE, ETFE, PFA, etc.). These resin films can be single-layered or multi-layered laminated films. Laminated films can also contain a combination of multiple layers formed from one or more materials of different composition.

[0112] As the substrate 3, which requires heat resistance, the polyimide film is particularly good at high temperature with excellent dimensional stability. Specifically, the polysiloxane adhesive layer 2 is formed by coating the polysiloxane composition onto the main surface 3a of the substrate 3 and then curing it.

[0113] For the main surface 3a of the substrate 3 to which the polysiloxane composition has been coated and adhered, an easy-adhesion treatment may also be performed as needed. Examples of easy-adhesion treatments include: primer treatment, corona treatment, etching treatment, plasma treatment, sandblasting treatment, etc. One or a combination of two or more of these can be selected.

[0114] There are no particular restrictions on the thickness of the substrate 3, and it can be freely selected. It can be selected from the range of thickness from 1 micrometer to 200 micrometers, more preferably 2 micrometers to 150 micrometers, and especially preferably 2.5 micrometers to 125 micrometers.

[0115] The polysiloxane adhesive layer 2 may be configured such that a main surface 2b is formed on the opposite side of the main surface 2a that contacts the substrate 3, and a release liner 11 is further provided on the main surface 2b. The release liner 11 is the same as in the first embodiment.

[0116] (Third Implementation) Next, the adhesive member 1c of the third embodiment of the present invention will be described with reference to FIG3. The adhesive member 1c includes a polysiloxane adhesive layer 2 and a substrate 3. The polysiloxane adhesive layer 2 is made of a cured polysiloxane composition and has the same structure as in the first and second embodiments. The substrate 3 has the same structure as in the second embodiment.

[0117] The adhesive member 1c of the third embodiment is a variation of the adhesive member 1b of the second embodiment, wherein two polysiloxane adhesive layers 2 (21, 22) are disposed on the substrate 3 of the adhesive member 1b of the second embodiment. Here, the adhesive member 1c of the third embodiment of the present invention will be described in terms of the differences from the second embodiment, and the parts that are the same as those in the second embodiment will not be described again except for the main parts.

[0118] In the third embodiment, the substrate 3 is a support in the shape of a thin film with two main surfaces 3a and 3b. The polysiloxane adhesive layers 21 and 22 can be in the form of a sheet or strip, etc. For example, the polysiloxane adhesive layer 21 has two main surfaces 21a and 21b, and the polysiloxane adhesive layer 22 has two main surfaces 22a and 22b. The substrate 3 is provided with a polysiloxane adhesive layer 21, in which one main surface 3a of the substrate 3 contacts the main surface 21a of the polysiloxane adhesive layer 21; and a polysiloxane adhesive layer 22, in which the other main surface 3b of the substrate 3 contacts the main surface 22a of the polysiloxane adhesive layer 22.

[0119] Polysiloxane adhesive layers 21 and 22 are formed by coating polysiloxane composition onto two main surfaces 3a and 3b of the substrate 3 and then curing them. Alternatively, the polysiloxane adhesive layers 21 and 22 can be in the form of a thin plate with two main surfaces, such as a sheet or strip. A release liner 11 is provided on at least one of the main surfaces 21b opposite to the main surface 21a of the polysiloxane adhesive layer 21 and opposite to the main surface 22b of the polysiloxane adhesive layer 22. However, the release liner 11 is not mandatory. Figure 3 shows an example where release liners 11 are provided on both sides of the adhesive member 1c. The release liner 11 is the same as in the second embodiment.

[0120] (Fourth Implementation) Next, the adhesive member 1d of the fourth embodiment of the present invention will be described with reference to FIG4.

[0121] The adhesive member 1d in the fourth embodiment includes: a polysiloxane adhesive layer 2, a substrate 3, and other adhesive layers 4. The polysiloxane adhesive layer 2 has the same structure as in the first embodiment. The substrate 3 is the same as in the second embodiment. In the fourth embodiment, the substrate 3 is, for example, a thin film-shaped support having two main surfaces 3a and 3b.

[0122] That is, the adhesive member 1d is a variation of the adhesive member 1b in the second embodiment. On the main surface 3b opposite to the main surface 3a of the substrate 3 of the adhesive member 1b in the second embodiment, another adhesive layer 4 is disposed. That is, on one of the main surfaces 3a of the substrate 3, the polysiloxane adhesive layer 2 is disposed in contact with the main surface 2a of the polysiloxane adhesive layer 2; on the other main surface 3b of the substrate 3, the adhesive layer 4 is disposed in contact with the main surface 4a of the adhesive layer 4.

[0123] Here, the adhesive member 1d of the fourth embodiment of the present invention will be described in a way that differs from the second embodiment. Except for the main parts, the parts that are the same as those in the second embodiment will not be described again.

[0124] The polysiloxane adhesive layer 2 is formed by coating the substrate 3 onto the main surface 3a and then curing it. The other adhesive layer 4 is a layer formed from a material that can be freely selected, provided it possesses adhesive strength. The other adhesive layer 4 is a layer formed from a material selected from at least one or a mixture of two or more materials chosen from, for example, acrylic, rubber, polysiloxane, and urethane. The other adhesive layer 4 can be formed, for example, by coating the substrate 3 onto the main surface 3b.

[0125] The polysiloxane adhesive layer 2 and the other adhesive layer 4 can each be a thin plate with two main surfaces, such as a sheet or strip. Alternatively, they can each have a release liner 11 on the main surface 2b opposite to the main surface 2a of the polysiloxane adhesive layer 2 that contacts the substrate 3, and on the main surface 4b opposite to the main surface 4a of the other adhesive layer 4 that contacts the substrate 3. The release liner 11 is the same as in the second embodiment.

[0126] 1a, 1b, 1c, 1d: Adhesive components 2,21,22: Polysiloxane adhesive layer 2a, 2b, 3a, 21a, 21b, 22a, 22b: main surface 3: Substrate 4: Adhesive layer 11: Peeling the liner

Claims

1. A polysiloxane composition, cured by the reaction of vinyl groups with Si-H bonds, comprising: an addition-curing liquid polysiloxane comprising a vinyl-containing polysiloxane and a Si-H-containing polysiloxane; and MQ polysiloxane resin; wherein, The aforementioned polysiloxane composition contains the aforementioned addition-curing liquid polysiloxane rubber and the aforementioned MQ polysiloxane resin as main components. It is formulated such that when the addition-curing liquid polysiloxane rubber is set to 100% by mass, the MQ polysiloxane resin is 11.1% by mass or more and 66.7% by mass or less. The weight content of the aforementioned MQ polysiloxane resin relative to the total weight of the aforementioned addition-curing liquid polysiloxane rubber and the aforementioned MQ polysiloxane resin is 10% by mass or more and 40% or less. After the aforementioned addition-curing liquid polysiloxane rubber is cured by monomer, the swelling degree of the aforementioned addition-curing liquid polysiloxane rubber, as measured by the following swelling degree measurement method, is 350% or less. After curing, the above-mentioned polysiloxane composition becomes a polysiloxane adhesive with a Shore A hardness of 17 or higher and 90 or lower, and an adhesive force of 5.0 Newtons or higher and 26.0 Newtons or lower per 25 square millimeters; (Swelling Determination Method) The swelling ratio is defined as the swelling ratio of the toluene absorption of a square sample of the above-mentioned addition-curing liquid polysiloxane rubber with a thickness of 50 micrometers and a side of 50 millimeters, which is immersed in toluene for 1 day at a temperature of 23 degrees Celsius (°C) and a humidity of 50%; Wherein, A: the initial mass of the above-mentioned sample; B: the mass of the above-mentioned sample after immersion in toluene; C: the dry mass of the above-mentioned sample after immersion in toluene and drying at 130 degrees Celsius (°C) for 2 hours. The swelling ratio (%) is defined as the value calculated by the following formula: Swelling ratio (%) = B / {A(×C / A)}×100%.

2. The polysiloxane composition as claimed in claim 1, wherein, The aforementioned polysiloxane adhesive further possesses: a reference adhesion to float glass of 0.02 Newtons or more and 0.75 Newtons per 1 cm radius, and a polysiloxane migration amount of less than 1 microgram per 1 square centimeter as determined by fluorescence X-ray analysis.

3. The polysiloxane composition as claimed in claim 1, wherein, The above-mentioned addition-curing liquid polysiloxane rubber is a two-component addition-curing liquid polysiloxane rubber.

4. The polysiloxane composition as claimed in claim 1, wherein, MQ polysiloxane resin has a framework mainly composed of three-dimensional siloxane bonds formed by a combination of trialkyl silaneoxy units (M unit (R3SiO1 / 2)) and tetrafunctional silaneoxy units (Q unit (SiO4 / 2)).

5. The polysiloxane composition as claimed in claim 1, wherein, It contains fillers.

6. An adhesive component comprising the polysiloxane adhesive described in any one of claims 1 to 5.

7. As in claim 6, the adhesive component, wherein, The aforementioned adhesive member comprises a substrate having a shape with two main surfaces; the aforementioned polysiloxane adhesive is disposed on at least one of the two main surfaces of the aforementioned substrate.

8. As in claim 7, the adhesive component, wherein, The aforementioned adhesive component comprises: a substrate having two main surfaces, and other adhesives; the aforementioned polysiloxane adhesive is disposed on one of the two main surfaces of the substrate; the aforementioned other adhesives are disposed on the other of the two main surfaces of the substrate.

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