TW200300443A - Polysiloxane rubber sheet for hot press bonding - Google Patents

Abstract

This invention provides a polysiloxane rubber sheet for hot press bonding, in which the sheet does not tightly fit with the press tool or article to be press bonded, press bonding process can be improved and also the sheet has good durability and does not contaminate the surrounding. As its characteristics, at least one side of the polysiloxane rubber sheet for hot press bonding has an arithmetic average surface roughness of 0.8–5 μ m.

Description

200300443 Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention (1) I. Technical field to which the invention belongs The present invention relates to the pressing and delaying of the pressed object between the pressed object and the heating and pressing device Those who use the silicone rubber sheet for hot-press bonding are particularly concerned with the silicone rubber sheet for hot-press bonding which has good mold release properties and does not easily contaminate the surrounding device parts and the adherend. 2. Advance Technology Recently, the number of exhibitors using LCD power distribution boards as laptop computers, word processing devices, photography cameras, pilot devices, and portable TVs has increased day by day. In order to make the liquid crystal drive, the electrodes and electrodes connected to the liquid crystal switchboard and the guide electrodes of the volatile printed circuit board (FPC) mounted on the transmission L and SI are interposed with an anisotropic conductive adhesive, and then heat-rolled. After that, be sure to connect the electrical and mechanical people. At this time, between the pressurizing tool and the FPC, heat is transferred from the pressurizing tool to the anisotropic conductive adhesive, and the uniform pressure is added for the purpose of using hot pressing. Extend the sheet. As the sheet for hot calendering, there are also those using fluororesin films such as polytetrafluoroethylene (PTFE). To make the pressure more uniform, usually low-elasticity, soft silicone rubber with good thermal conductivity is used. Thinner. However, the silicone rubber sheet has better adhesiveness on the sheet surface than the oxyresin film. After the sheet is tightly attached to the pressure tool and adhered to the FPC, not only the workability of the press-bonding process is significantly reduced, but the sheet is deteriorated and durable when peeled Worse. Therefore, as the silicone rubber sheet for hot-press bonding, for example: after adding boron nitride to silicone rubber, improve the thermal conductivity and reinforce the glass cross (Japanese Patent Laid-Open No. 5-198344), and use silicone rubber. Rubber with boron nitride and conductivity (Please read the precautions on the back before filling this page) • Binding

This paper size is in accordance with Chinese National Standard (CNS) A4 (210X297 mm) -5- 200300443 A7 B7 V. Description of the invention (2) (Please read the precautions on the back before filling in this page) After the substance is used, the glass Cross reinforcement is accompanied by antistatic properties (Japanese Patent Application Laid-Open No. 6-3853), those with good thermal conductivity such as ceramics and metals in silicone rubber (Japanese Patent Application Laid-open No. 6-289352), or silicone rubber When carbon black with a volatile content other than moisture of 0.5% or less is added, heat resistance is improved (Japanese Patent Application Laid-Open No. 7-11010) and the like. However, the adhesion to the surface of the sheet has not been improved. The problem of the adhesion of the sheet surface printed by the employee cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs was proposed on the surface of the thin silicone rubber sheet. The method of reducing the adhesiveness of the sheet after uniformly dressing scaly powder such as talc and mica After removing the powder, wash the excess powder with water and remove it. In addition, after the silicone rubber sheet and the heat-resistant resin film are compounded, the surface adhesion of the sheet is reduced, and at the same time, a silicone rubber composite sheet for hot pressing with ideal strength is disclosed (Japanese Patent Application Laid-Open No. 8- 1 74765). However, this sheet has the disadvantage that the silicone rubber adheres to the heat-resistant resin film and is less flexible than the rubber alone. This tendency is particularly strong when a heat-resistant resin film is provided on both sides of the sheet. This person who is not flexible cannot obtain a uniform pressure when pressing, so it is necessary to increase the pressure, but this relationship is limited by the strength of the rolled body. This disadvantage can be improved by using low-hardness rubber to improve its flexibility. However, in order to reduce the hardness of the rubber, it is necessary to reduce the carbon charge, which has recently resulted in a lack of poor thermal conductivity. Also, 'It is not easy to clean the contamination of the LCD switchboard after installing the FPC. Therefore, it is necessary to consider that the project is as free from contamination as possible. It is expected to develop a person who does not follow the first method in order to not worry about contaminating peripheral device parts and being rolled Silicone rubber sheet. -6-This paper size is in accordance with Chinese National Standard (CNS) A4 specification (210X297 mm) 200300443 A7 B7 V. Description of the invention (3) III. Summary of the invention Therefore, the inventor aims at the ideal surface release property and does not easily contaminate peripheral devices As a result of precise examination of the silicone rubber film for hot-press bonding such as parts and rolled objects, it was found that those who can obtain good results after having a certain range of unevenness on at least one surface of the silicone rubber sheet have completed the present invention. Therefore, the object of the present invention is to provide a polysiloxane for hot-press bonding, which does not adhere to a pressing tool or a rolled object, can improve the workability of the rolling process, and has good durability of the flake itself without contaminating the surroundings. Rubber sheet 〇 This object of the present invention is achieved by a silicone rubber sheet for hot pressing which is characterized by having at least one surface with an arithmetic mean 0.8 // m ~ 0.5 // m unevenness. The silicone rubber sheet is preferably one containing carbon black and / or an ideal polar conductive filler with a volatile content of 0.5% by weight or less other than its moisture. 4. Embodiment The silicone rubber sheet used in the present invention is a sheet that is formed into a sheet and then hardened after being mixed with an organopolysiloxane and a filler and a hardener. This organic polysiloxane has an average degree of polymerization of 200 or more, and is preferably an average composition represented by the following formula (I).

RnSiO (4- η) / 2 (1) In the above formula, R represents a substituted or unsubstituted monovalent hydrocarbon group and / or a hydroxyl group, and η represents a positive number from 1.95 to 2.05. As specific examples of r, such as: methyl, ethyl, propyl and other bases, cyclopentyl, and cyclohexyl, and other bases, this paper size applies the Chinese National Standard (CNS) A4 specification (210 × 297 mm) (Please read the precautions on the back before filling out this page) Installation, printed by 1T Intellectual Property Bureau, Ministry of Economic Affairs, Consumer Consumption Cooperative, 200300443 A7 _B7__ V. Description of Invention (4) (Please read the precautions on the back before filling out this page) Examples of aliphatic alkenyl groups such as vinyl and allyl groups, aryl groups such as phenyl and tolyl groups, or halogenated hydrocarbon groups such as partial chlorine atoms and fluorine atoms substituted by such hydrogen atoms. In the present invention, the main chain of the organic polysiloxane is formed by dimethylsiloxane units, or the main chain of the organic polysiloxane is introduced by vinyl, phenyl, trifluoropropyl, or the like. should. In addition, those whose molecular chain ends are sealed with a triorganosilyl group or a hydroxyl group may be used. Examples of the triorganosilyl group include: trimethylsilyl group, dimethylethylene silyl group, and triethylene group. Examples such as silane. In addition, the degree of polymerization of the organic polysiloxane is preferably 200 or more, and the viscosity of 25 ° C is 300 cs or more. When the degree of polymerization is less than 200, the mechanical strength after hardening tends to decrease and become brittle. As a filler, when heat resistance is a priority, volatiles other than water are preferably used with carbon black less than 0.5% by weight. 'When thermal conductivity is a priority, a good thermal conductivity filler is selected. should. Carbon black with a volatile content of less than 0.5% by weight, printed by employees of the Intellectual Property Bureau of the Ministry of Economic Affairs, can not only improve the heat resistance of silicone rubber sheets, but also improve the thermal conductivity and mechanical strength. Preventive. Carbon black is classified into furnace black, channel black, hot carbon black, acetylene carbon black, etc. by its manufacturing method, but those with a volatile content other than moisture of 0.5% or less such as acetylene carbon black, Tokai Ping 1-27 2667 is an ideal one such as conductive carbon black. The method for measuring volatiles other than moisture is described in IS K 622 1 "Test method for carbon black for rubber". The specific content is that a predetermined amount of carbon black is placed in a pot, and it is heated at 950 ° C for 7 minutes. Volatile weight loss. The compounding amount of the carbon black is 20 to 150 parts by weight of 100 parts by weight of the organopolysiloxane, and more preferably 40 to 100 parts by weight. When it is less than 20% by weight -8- This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) 200300443 A7 B7__ V. Description of the invention (5) The thermal conductivity will be insufficient, otherwise, if it is higher than 150 parts by weight Difficult to fit and extremely poor in formability. (Please read the precautions on the back before filling out this page) Examples of ideal thermally conductive radon fillers used in the present invention are: oxide oxide, boron nitride, nitriding oxide, hydroxide oxide, thorium oxide, oxide Inorganic powders such as zinc and quartz, and metal powders such as silver, nickel, copper, and iron are preferred. The blending amount of these good thermally conductive filling materials is preferably 50 to 1,200 parts by weight of 100 parts by weight of organopolysiloxane, and it is particularly preferred for users in the range of 100 to 1,000 parts by weight. When it is less than 50 parts by weight, thermal conductivity is insufficient. On the other hand, when it is more than 1,200 parts by weight, molding processability is deteriorated, mechanical strength after curing is lowered, and rubber flexibility is lost. In addition, carbon black and an ideal conductive filler can also be used. The hardening agent used in the present invention is usually a hardened silicone rubber, and may be appropriately selected from those known in the art. Such as: di-third-butyl peroxide, 2,5-dimethyl-2,5-di (third-butyl peroxide) hexane, dicumenyl peroxide, etc. during radical reaction In the case of organic peroxides, the blending amount is preferably 0.1 to 5 parts by weight of 100 parts by weight of the organopolysiloxane. Printed by the Consumers' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. Organic polysiloxanes have two or more aliphatic alkenyl groups. For example, one molecule contains two or more hydrogen atoms bonded to silicon atoms. Organic hydrogenated polysiloxanes are in contact with platinum group metals. Examples of additional reaction hardeners made by the media. The compounding amount of the organic hydrogenated polysiloxane is directed to the aliphatic alkenyl group of the organic polysiloxane, and the molar ratio of the hydrogen atom to the silicon atom (tri Si-H / aliphatic group) is preferably 0.5 to 5 The platinum group metal catalyst is preferably from 1 ppm to 1,000-ppm of organopolysiloxane. When the organopolysiloxane contains more than two silanol groups, for example, it has two or more alkoxy, ethoxyl, ketoxime, and acryloxy hydrolyzable basic paper sizes. Applicable to Chinese National Standards (CNS) A4 specification (210X297 mm) _ 9 _ 200300443 A7 B7 V. Examples of condensation reaction hardeners such as organosilicon compounds (6). (Please read the precautions on the back before filling out this page) In the present invention, from the perspective of the difficulty of molding, organic peroxides or additional reaction hardeners are ideal users as hardeners. In the present invention, when necessary, reinforcing silica dioxide fillers such as hydrophilic silica, hydrophobic silica and the like, clay, calcium carbonate, diatomaceous earth, titanium dioxide and other fillers, and low-molecular-weight siloxanes can also be added. Dispersants such as esters, silanol-based organosilicon compounds, adhesives such as silane coupling agents, titanium coupling agents, platinum group metal catalysts with flame resistance, and PTFE with enhanced green strength Ethylene particles, etc. The blending method printed by the employee's consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs as the compounding method of the silicone rubber mixture can use a double-roller roller, a kneader, a flash mixer, a planetary mixer and other mixing machines to mix the ingredients. In general, it is advisable to add a hardener before use. As a method for forming a silicone rubber sheet, for example, a method of hot pressing a silicone rubber mixture mixed with a curing agent in a mold, and then using a calender, an extruder, etc. to form a predetermined shape. Heat hardening method, dissolving in a liquid silicone rubber mixture or a solvent such as toluene, and applying the liquefied silicone rubber mixture to a film such as polyethylene terephthalate (PET), drying and removing the solvent, and then heating Examples of hardening methods. The thickness of the formed silicone rubber sheet is preferably 0.1 ~ 10mm. When the thickness is less than 0.1 mm, it cannot sufficiently follow the rolled body, resulting in uneven pressure. Conversely, if the thickness is more than 10 mm, the thermal conductivity is deteriorated. In the present invention, after at least one surface of the silicone rubber sheet has unevenness, it is accompanied with a mold release property that reduces adhesiveness. However, the arithmetic average surface roughness must be 0.8 // m to 5 / zm. When the unevenness is less than 0.8 // m-10- This paper size applies Chinese National Standard (CNS) A4 specification (210X297 mm) 200300443 A7 B7 Printed by the Consumer Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs ), The polysilicon sheet will be easy to adhere. Conversely, if the contact is more than 5 // m, the electrode's electrical contact will be unstable. In addition, when the unevenness is provided on both surfaces, the roughness of the two surfaces may be the same or different. This arithmetic average surface roughness is measured in accordance with JIS B 0601. The unevenness is set by embossing, and it is highly desirable because it is inexpensive and quick. The methods of attaching embossing on both surfaces of the silicone rubber sheet are: 1) When the sheet is manufactured by using a calender roll, the silicone rubber sheet composition is separated on the rough surface of the plastic film, and the plastic is hardened before curing. The method of separating the side of the sheet from the back and pressing it on the roller with embossing, copying the embossing, and then stripping the silicone rubber from the hardened plastic film. 2) The vulcanized silicone rubber sheet is sandblasted. Coarse method, etc. 3) After coating on one side of the plastic film embossed on both sides, carefully take this coil before curing and directly put it in the oven for vulcanization, and then strip the silicone rubber from the plastic film. Method, etc. The polysiloxane sheet for hot calendering of the present invention has good heat resistance, thermal conductivity, strength and workability, and at the same time has the elasticity as a polysiloxane rubber. Therefore, a pressure forming machine is used to form the laminated board, and the bendability is easy. The sheet used for the purpose of uniformly pressing while conducting heat while printing the substrate. After the anisotropic conductive adhesive is used, the electrodes connected to the liquid crystal display and the FPC guide electrode mounted on the transmission LSI are thermally bonded. The sheet used when connecting electrical and mechanical parts is particularly modified. [Effects of the Invention] The silicone rubber sheet for hot-press bonding with unevenness on at least one surface of the sheet of the present invention has unevenness on at least one surface. Therefore, the pressure tool, by (please read the precautions on the back before filling in this (Page)-Bookbinding

This paper size applies Chinese National Standard (CNS) A4 specification (21〇 > < 297mm) 11-200300443 A7 B7 V. Description of the invention (8) (Please read the precautions on the back before filling this page) Calendered The release properties of the materials are good, and the excellent properties of the surroundings cannot be dyed. Therefore, not only the sheet itself has good durability, but also improves the workability of the hot rolling step. In addition, when the sheet is pressed, it can be moved slightly if the sheet is not tight, so that the rolling part does not wind up, and even pressure can be added. [Examples] Hereinafter, the details of the present invention will be further described by examples, but the present invention is not limited thereto. [Example 1] The average degree of polymerization produced by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs printed on 99.85 mole% difluorenylsiloxane units and 0.15 mole% methylvinylsiloxane units is 8,000. 50 parts by weight of acetylene black and 5 parts by weight of reinforcing silica (Aerosil R -972: trade name, manufactured by Degussa), uniform after kneading. For 100 parts by weight of this silicone rubber mixture, add 0.1 part by weight of a solution of chloroplatinic acid in isopropanol (containing 2% by weight of platinum) and 0.05 parts by weight of a reaction inhibitor acetylene alcohol (3-methyl-1 -Butyne-3-ol) and 1.2 parts by weight of methyl hydrogenated polysiloxane represented by the following formula (2), and then fully kneaded with a two-roller roller to prepare a hardened polysand rubber compound . CHa CH3 (CH3) 3S i 0 (S ί 0) i2 (S ί 0) 12S i (CH3) 3 ⑵

CH3 H This paper size is in accordance with Chinese National Standard (CNS) A4 specification (210X297 mm) -12-200300443 A7 B7 Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs and Consumer Cooperatives V. Description of the invention (9) Using a calendering machine to obtain polysilicon After the oxygen rubber mixture was separated to a thickness of 0.30 mm, it was copied on a polyethylene terephthalate (PET) film with a single-sided embossing thickness of 100 // m and an arithmetic average surface roughness of 0.7 / zm. Then, the embossing roller with an arithmetic average surface roughness of 3.5 // m was applied to the surface of the separated sheet opposite to the PET film. After the embossing was replicated on the surface of the silicone rubber, it passed through 60 ° in 5 minutes. C is hardened in a heating furnace. After the silicone rubber sheet was peeled from the PET film, it was post-heat-cured at 200 ° C for 2 hours, and then a silicone rubber sheet for thermocompression bonding was produced. Surf test 501 (mithutoyo (share)) (Product name), after measuring the surface roughness of the copy embossed surface, the arithmetic average surface roughness is 2.9 // m. [Example 2] A kneader was used to uniformly knead 99.85 mol% of dimethylsiloxane units and 0.15 mol% of methyl vinyl siloxane units. The average degree of polymerization was 100 weights of 8,000. 400 parts by weight of alumina powder (alumina AL-45: Showa Denko (trade name) manufactured by Showa Denko Corporation) as a thermally conductive filler, and a specific surface area of 20 parts by weight is 20 parts by weight. 0 m 2 / g of silicon dioxide fine powder (Aerosil 200: Japan Aerosil (stock) product name), and 5 parts by weight of α, ω-dimethylol polysiloxane represented by the following formula (3), then Heat treatment was performed at 150 t for 2 hours. Cli HO (Si-〇) i〇h ⑶CH3 (Please read the precautions on the back before filling this page) • Installation ·

This paper size applies Chinese National Standard (CNS) A4 specification (210X297 mm) -13- 200300443 A7 ___ B7 V. Description of the invention (10) (Please read the precautions on the back before filling this page) After cooling, it will be '100 1.5 parts by weight of organic peroxide (C-23: Shin-Etsu Chemical Industry Co., Ltd.) as a hardener is added to the silicone rubber mixture by two parts and mixed with a calender molding machine. Separate 0.30mm thickness. The divided silicone rubber composition was reproduced on a PET film having an arithmetic average surface roughness of 0.7 / zm on one side and embossed to a thickness of 100 // m, and then the arithmetic average surface roughness was 3.5 A m The embossing roller was pressed on the surface of the sheet separated from the opposite side of the PEE film. After the embossing was replicated on the surface of the silicone rubber, it was passed through a heating furnace at 160 ° C for 5 minutes and then hardened. The silicone rubber sheet was peeled from the pet film, and then post-heat-cured at 200 ° C for 4 hours, and then a silicone rubber sheet for thermocompression bonding was prepared.实施 [Example 3] ν The average degree of polymerization of 8,000 mol% dimethylsiloxane units and 0.15 mol% methylvinylsiloxane printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs was 1 〇〇weight parts of methyl vinyl polysilane with a double-roller with an average particle diameter of 40nm, 50 parts by weight of acetylene carbon black with a volatile content of 0.10% other than water, and 5 parts by weight of reinforcing silica (Aerosil R- 972 ·· Degussa's product name) Knead uniformly. To this 100 parts by weight of a silicone rubber mixture, 0.1 part by weight of an isopropanol solution of platinum chloride acid (2% by weight of platinum) and 0.05 parts by weight of an acetylene alcohol (3-methyl-1) as a reaction inhibitor were added. -Butyne-3-ol) and 1,2 parts by weight of methyl hydrogenated polysiloxane represented by the formula (2), and kneaded with a double roll to prepare a curable polysiloxane rubber mixture. -14- This paper size is in accordance with Chinese National Standard (CNS) A4 specification (210X297 mm) 200300443 A7 B7 V. Description of the invention (11) (Please read the precautions on the back before filling this page) The silicone rubber mixture was separated to a thickness of 30 mm, and then copied on a PET film with a thickness of 100 // m and an arithmetic mean roughness of 0, and passed through a heating furnace at 1 60 ° C for 5 minutes and then hardened. After the silicone rubber sheet was peeled off from the PET film, after 200 hours of post-heat hardening, the sheet was sandblasted on one side to make a silicon adhesive for pressure bonding with an arithmetic average surface roughness of 1.8 / zm embossed surface. Oxygen rubber sheet. [Example 4] The average degree of polymerization of 99.85 mole% dimethylsiloxane units and 0.15 mole% methylvinylsiloxane units was uniformly kneaded by a kneader to a weight of 1,000 to 1,000 Hundreds of 400 parts by weight of a methyl ethoxylated polysand oxygen institute, alumina powder (alumina AL-45: trade name of Showa Denko Co., Ltd.) as a good thermal conductivity filler, 30 parts by weight After fine silica powder with a surface area of 200 m 2 / g (Aerosil 200: trade name of Aerosil Japan), and 5 parts by weight of α, ω-dimethylol polysiloxane represented by the formula (3) , Heat treatment at 1 50 ° C for 2 hours. After printed and cooled by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, 1.5 parts by weight of organic peroxide as a hardener is added to 100 parts by weight of this silicone rubber mixture (C-2 4: Shin-Etsu Chemical Industry Co., Ltd.) (Product name) after mixing with a double roll, dissolving in xylene to make a 60% xylene solution, and using a Comma coater at an arithmetic average surface roughness of 0.7 // m for single-side embossing thickness i〇〇 // m After coating the pet film on the embossed surface with a thickness of 0.2 mm, xylene was evaporated to dryness at 80 ° C. Then, the embossing roller with an arithmetic average surface roughness of 3 · 5 // m is pressed on the surface of the coated sheet opposite to the PET film, and on the surface of polysilicone rubber -15- This paper applies Chinese national standard (CNS ) A4 size (210X297 mm) 200300443 A7 B7 V. Description of the invention (12) After the rubber surface is copied and embossed, it is hardened in a heating furnace at 1 60 ° C for 5 minutes. The silicone rubber sheet was peeled from the PET film, and then post-heat-cured at 200 ° C for 4 hours to prepare a silicone rubber sheet for hot-pressing. [Comparative Example 1] The silicone rubber mixture of Example 1 was used to divide a thickness of 0.30 mm by a calender molding machine, and then copied to a PET film having a thickness of 100 // m and an arithmetic average surface roughness of 0, and passed through it in 5 minutes. After heating at 160 ° C, it is hardened. After the silicone rubber sheet was peeled off from the PET film, talc powder having an average particle size of 1 3 // m was rubbed on the surface of the sheet with gauze, and uniformly coated. In a desiccator, heat-treat at 200 ° C for 4 hours, then wipe the sheet under running water with a sponge while washing it, remove excess powder, and dry the water. Then, make a silicone rubber sheet for thermocompression bonding. [Comparative Example 2] After using the silicone rubber mixture of Example 2 and using a calender molding machine, the thickness was 0.30 mm, and then it was copied on a PET film having an arithmetic average surface roughness of 0 // m in thickness. After passing through a 160 ° C heating furnace for 5 minutes, it was hardened. Then, the silicone rubber sheet was peeled off from the PET film, and the mica powder having an average particle diameter of 20 // m was rubbed on the sheet with gauze and uniformly coated. After 200 hours in a dryer, heat treatment was performed for 4 hours. After the sheet was wiped and washed with running sponge in running water, the excess powder was removed and the water was dried to form a silicone sheet for hot rolling. This paper size applies to China National Standard (CNS) A4 (210X297 mm) _ _

Printed by the Consumers' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs (Please read the precautions on the back before filling this page)

200300443 A7 B7 V. Description of the invention (13) [Comparative Example 3] (Please read the precautions on the reverse side before filling out this page) Except that no embossing is performed, it is completely performed in the same way as in Example 3 and made into hot press Adhesive silicone sheet. [Comparative Example 4] Primer C (a Shin-Etsu Chemical Industry Co., Ltd. trade name) was applied to an aromatic polyimide film (kapton: manufactured by Toyo Deupone (Stock Corporation)) with a heat-resistant resin film thickness of 1 2 // m. (Trade name), and then dried at room temperature for 30 minutes. In addition, a calendering machine was used to separate the hardenable polysilicone rubber mixture prepared in Example 1 to a thickness of 0.30 mm, and then copied to a PET film having an arithmetic average surface roughness of 0 in thickness loo # m. Then, the kapton film of the primer coating was calendered on this sheet, and then the silicone rubber mixture was cured in a 160 ° C heating furnace for 5 minutes. After the PET film was peeled, it was heat-treated at 200 ° C in a desiccator for 4 hours to prepare a silicone rubber composite sheet for thermocompression bonding. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs (calendering test) A thickness of 30 // m is placed under the inner surface of the silicone rubber sheet for hot rolling made in Examples 1 to 4 and Comparative Examples 1 to 4. Teflon film (registered trademark of Teflon series) made by deapone, japan, and limidade, followed by 2 pieces of FPC with 25 // m pitch copper electrodes and an anisotropic conductive adhesive with a thickness of 22 // m. After calendering, heating and pressing at 340 ° C, this paper applies Chinese National Standard (CNS) A4 specification (210X 297 mm) _ 17-200300443 A7 B7 V. Description of the invention (14) (Please read the back first (Please note this page, please fill in this page again) The surface of the silicone sheet for hot rolling of the tool is rolled at a pressure of 40 kgf / cm2 for 20 seconds. After repeating this calendering, the number of times until the anisotropic conductive adhesive cannot be heat-hardened by measuring the sheet adhered state of the pressurized tool and the uniform pressure was measured. This number is determined by the conduction of the upper and lower FPC copper electrodes. However, when the silicone rubber sheet for hot rolling of Comparative Example 4 was used, the kapton film side was measured with a pressure tool. In addition, the thickness of the film is increased, the heat conduction is deteriorated, and the pressing time is extended by 25 seconds. The results are shown in Table 1. Table 1 Sample sheet durability and weight The arithmetic average of the sheet pressurizing and pressing tool Table shows the number of times the adhesion of the tool is contaminated surface roughness (times) Table Example 1 100 ^ fnT Μ te J MN 2.9 0.3 Example 2 47 Μ J turned EJ \\\ 1.2 0.6 Example 3 95 New j \\\ Sichuan, 1.8 0.3 Example 4 45 M 1.3 0.7 Comparative Example 1 67 te Slightly 0.2 0.3 Comparative Example 2 33 ίκ Slightly 0.7 0.6 Comparative Example 3 71 Yes Μ J \ Ν0.3 0.3 Comparative Example 4 78 Μ 0.2 0.1 When the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs printed Comparative Examples 1 and 2, the pressurized tools became contaminated after continuous use and must be washed. On the other hand, in Examples 1 to 4, the pressure-resistant tools are not required to be washed and still resistant to -18. This paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) 200300443 A7 B7 V. Description of the invention (15) Persistence . In Comparative Example 3, it is necessary to wash twice a day, and it is extremely inconvenient to cool the calender at this time. In addition, for Example 1 and Comparative Example 4, except that the pressing pressure of the pressing tool was reduced to 30 kgf / cm2, the rolling test was performed under the same conditions, and it was proved that the conductivity between the copper electrodes of the upper and lower FPCs of Example 1 was good In contrast, Comparative Example 4 showed partial conduction failure. The silicone rubber composite sheet for hot press bonding of Comparative Example 4 has no problem with the adhesion and staining of the pressurizing tool. However, compared with the present invention, the rolling time is longer, and it is necessary to increase the extrusion pressure. (Please read the notes on the back before filling this page)

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Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs -19- This paper size applies to China National Standard (CNS) Α4 specification (210 × 297 mm)

Claims (1)

200300443 A8 B8 C8 ___D8____ 6. Scope of patent application 1 1. A silicone rubber sheet for thermocompression bonding, characterized in that at least one surface of the sheet has unevenness with an arithmetic average roughness of 0.8 // m to 5 // m 〇2. For example, the silicone rubber sheet for hot-press bonding according to item 1 of the scope of patent application, wherein the silicone rubber sheet contains carbon black with a volatile content other than moisture of 0.5% by weight or less. 3. For example, the silicone rubber sheet for hot-pressing application of item 1 or 2 of the patent application scope, wherein the silicone rubber sheet is a filler containing a good thermal conductivity. 4. For example, the silicone rubber sheet for hot pressing according to any one of claims 1 to 3, wherein the thickness of the silicone rubber sheet is 0.1 to 10 mm. 5. The silicone rubber sheet for hot pressing according to any one of claims 1 to 4, wherein the unevenness of the surface is set by embossing. (Please read the precautions on the back before filling out this page) The paper size printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs uses the Chinese National Standard (CNS) A4 (210X297 mm) -20-200300443 (I) This case The designated representative map is: no representative map (2) simple description of the component representative symbols of the representative map in this case