KR20120053467A - Silicone rubber sheet for thermocompression bonding - Google Patents

Abstract

PURPOSE: A silicon rubber sheet for thermal compression is provided to reduce concavo-convexes on the surface of the sheet in contact with a chip on flex(COF). CONSTITUTION: A silicon rubber sheet for thermal compression includes a thermoconductive silicon rubber layer(12) and flat or opening processed glass cloth(11) which is stacked and integrated with the thermoconductive silicon rubber layer. The porosity of the flat or opening processed glass cloth is less than or equal to 10%. The porosity is represented by an equation, porosity = ((b1×b2) / (a1×a2))×100. In the equation, a1 is the average value of the center length of adjacent warps; a2 is the average value of the center length of adjacent wefts; b1 is the average value of the gap of adjacent warps; and b2 is the average value of the gap of adjacent wefts. The thickness of glass cloth is in a range between 0.02 and 0.1mm.

Description

Silicone Rubber Sheet for Thermocompression {SILICONE RUBBER SHEET FOR THERMOCOMPRESSION BONDING}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silicone rubber sheet for thermocompression bonding used for the purpose of uniformly applying pressure while conducting heat in a wiring connection step of an electric / electronic device component.

In manufacturing the liquid crystal panel, in order to drive the liquid crystal, the transparent lead electrode of the liquid crystal panel and the lead electrode of the flexible printed circuit board (COF) equipped with the driving LSI are thermo-compressed through an anisotropic conductive adhesive (paste or film). The electrical and mechanical connection is performed. In this case, in order to apply a uniform pressure with heat, it is common to sandwich a silicone rubber sheet between a pressurized and heated metal tool and C0F.

As a silicone rubber sheet for thermocompression bonding, for example, boron nitride and a conductive material are mixed with silicone rubber and reinforced with glass cross (Patent Document 1: Japanese Patent Application Laid-Open No. 5-198344) or nitriding to silicone rubber Boron and a conductive material are blended to reinforce with a glass cross to impart antistatic properties (Patent Document 2: Japanese Patent Application Laid-open No. Hei 6-36853), and silicone rubber is blended with materials having good thermal conductivity such as ceramics and metals. (Patent Document 3: Japanese Unexamined Patent Application Publication No. 6-289352), and improved heat resistance by blending carbon rubber having 0.5% or less of volatile matter except moisture (Patent Document 4: Japanese Patent Application Laid-open No. H6-289352). 11010) is known. However, these things do not improve on the adhesiveness of the sheet surface.

Then, by composite | combining the sheet | seat which mix | blended carbon black with silicone rubber, and the heat resistant resin film, the silicone rubber composite sheet | seat for thermocompression bonding which has no adhesiveness on the sheet surface and is excellent also is proposed (patent document 5: Unexamined-Japanese-Patent No. 8). -174765). However, since the silicone rubber is bonded to the heat resistant resin film, the sheet is less flexible than the rubber alone. This tendency becomes especially strong when a heat resistant resin film is provided on both surfaces of a sheet. For this reason, since it becomes difficult to apply a pressure to uniformity at the time of pressurization, it is necessary to enlarge a pressurization force, but this pressurization pressure has a limit with respect to the intensity | strength of a to-be-adhered body.

Moreover, laminating | stacking a glass cross or a glass cross processing fluororesin sheet and a thermally conductive silicone rubber is proposed (patent document 6: Unexamined-Japanese-Patent No. 3244187, patent document 7: Unexamined-Japanese-Patent No. 4301468, patent document 8 :). Japanese Patent Laid-Open No. 2001-315248, Patent Document 9: Japanese Patent Laid-Open No. 2004-168025).

However, in recent years, the liquid crystal panel has been further refined, and even if the irregularities caused by all of the glass crosses used in conventional products prevent the uniform crimping or cause the position shift between the panel electrode and the C0F electrode, The development of a new high-precision sheet is required.

Japanese Patent Laid-Open No. 5-198344 Japanese Patent Laid-Open No. 6-36853 Japanese Patent Laid-Open No. 6-289352 Japanese Patent Laid-Open No. 7-11010 Japanese Patent Laid-Open No. 8-174765 Japanese Patent No. 3244187 Japanese Patent No. 4301468 Japanese Patent Laid-Open No. 2001-315248 Japanese Patent Publication No. 2004-168025

This invention is made | formed in view of such a situation, and an object of this invention is to provide the thermocompression-bonding silicone rubber sheet suitable for manufacture of a high precision liquid crystal panel.

The above object of the present invention has been achieved by a thermocompression silicone rubber sheet in which a flat or opened glass cross is laminated with a thermally conductive silicone rubber layer.

That is, as a result of various studies by the present inventors, compared to the flat or unopened glass cross used in the conventional silicone rubber sheet for thermocompression bonding, by using the flat or unopened uneven glass cross as a base material The pressure distribution at the time of crimping | compression-bonding became more uniform, and it discovered that the deformation | transformation and the shift | offset | difference of COF can be suppressed, and came to achieve this invention.

Accordingly, the present invention provides the following silicone rubber sheet for thermal compression.

Claim 1:

A silicone rubber sheet for thermocompression bonding, wherein a glass cross processed flat or open to the heat conductive silicone rubber layer is laminated.

Claim 2:

The said flat or open-processed glass cross is 10% or less by the porosity represented by following formula (I), The silicone rubber sheet for thermocompression of Claim 1 characterized by the above-mentioned.

Porosity = [(b ₁ × b ₂ ) / (a ₁ × a ₂ )] × 100 (I)

(Wherein a ₁ is the mean value (μm) of the center-to-center length of adjacent warp yarns, a ₂ is the mean value (μm) of the center-to-center length of adjacent weft yarns, and b ₁ is the mean value (μm) of the gap between adjacent warp yarns. ), B ₂ represents an average value (μm) of the gap between the adjacent weft yarns.)

Claim 3:

The said glass cross is eye-treated with a silicone resin, and the thermally conductive silicone rubber layer is laminated | stacked on at least one surface, The silicone rubber sheet for thermocompression of Claim 1 or 2 characterized by the above-mentioned.

Claim 4:

The thickness of the said flat or open-processed glass cross is 0.02 mm or more and 0.1 mm or less, The silicone rubber sheet for thermocompression bonding in any one of Claims 1-3 characterized by the above-mentioned.

Claim 5:

The thermally conductive silicone rubber layer has a thermal conductivity of 0.3 W / mK or more and 5 W / mK or less, and has a hardness of 30 to 90 or less, wherein the silicone rubber sheet for thermocompression bonding according to any one of claims 1 to 4.

In the conventional glass cross, the intersection of the warp and the weft is pressed particularly strongly by the flexible printed circuit board at the time of thermocompression bonding. For this reason, positional deviation may occur in the electrode junction of a narrow pitch. Moreover, in the single-layer heat conductive rubber sheet which does not contain a glass cross, since it is easy to deform | transform compared with a glass cross containing product, there existed a tendency for position shift to occur especially at the edge part of a flexible printed circuit board.

On the other hand, the silicon rubber sheet for thermocompression bonding of this invention laminates and integrates the glass cross processed flat or opened, and the unevenness | corrugation of the sheet surface which contact | connects C0F is reduced significantly compared with the prior art, and the position shift also in the narrow pitch electrode bonding. It became possible to greatly suppress this.

1 is a cross-sectional view of a silicon rubber sheet for thermal compression according to the first embodiment of the present invention.

The silicone rubber sheet for thermocompression bonding of the present invention is produced by laminating a thermally conductive silicone rubber layer on at least one surface of a substrate cross on which a silicone resin is treated on a flat or opened glass cross.

FIG. 1 shows an example thereof, and is formed by laminating a thermally conductive silicone rubber layer 12 on one surface of the base cross 11. 11A shows glass fiber and 11b shows a silicone resin.

Here, as a glass cross used for this invention, the average filament diameter of the yarn which comprises a warp and weft yarn is 4 micrometers or more and 8 micrometers or less, and thickness is 0.03 mm or more and 0.20 mm or less, especially 0.10 mm or less, and the density of a warp and a weft yarn, respectively It is preferable that it is 50 pieces / 25 mm or more. If the filament diameter and thickness is smaller than this, the strength is insufficient. On the contrary, if the filament diameter and thickness are large, the unevenness of the surface of the sheet is increased to prevent uniform pressure transmission. Moreover, even if the density of warp and weft yarn becomes small, the unevenness | corrugation of a sheet surface becomes large.

The glass crosses are flat or open-finished, but the open-loop processing method includes an ultrasonic method for opening the glass cross in the water in which the glass cross is ultrasonically vibrated, a pressing method using a rotating cylinder for pressing and opening the glass cross in the hot water by a vertical rotating cylinder, What is necessary is just to apply the columnar high pressure-pressure injection opening method, the vibro washer method, the ridge method, etc. which inject | pour and open the columnar high pressure water to a glass cross.

In this case, it is preferable that the said flat or open-processed glass cross is 10% or less, especially 0-5% by the porosity represented by following formula (1).

Porosity = [(b ₁ × b ₂ ) / (a ₁ × a ₂ )] × 100 (I)

(Wherein a ₁ is the mean value (μm) of the center-to-center length of adjacent warp yarns, a ₂ is the mean value (μm) of the center-to-center length of adjacent weft yarns, and b ₁ is the mean value (μm) of the gap between adjacent warp yarns. ), B ₂ represents an average value (μm) of the gap between the adjacent weft yarns.)

It is preferable that the said flat or open-processed glass cross is eye-treated with a silicone resin. In this case, it is preferable to perform a silane coupling agent process to glass cross so that silicone resin may adhere strongly to glass fiber. Examples of the silane coupling agent include vinyl group-containing silane coupling agents such as vinyltrimethoxysilane and vinyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, and 2- (3,4-epoxycyclohexyl) ethyltri Epoxy group-containing silane coupling agents such as methoxysilane, N-2 (aminoethyl) 3-aminopropyltrimethoxysilane, N-2 (aminoethyl) 3-aminopropylmethyldimethoxysilane, 3-aminopropyltriethoxy Although there are (meth) acryl group-containing silane coupling agents such as amino group-containing silane coupling agents such as silanes and 3-methacryloxypropyltrimethoxysilane, glass cross and silicone resins are particularly used when vinyl group-containing silane coupling agents are used. The adhesive force of the is improved.

Moreover, as for the thickness of the glass cross used for a base material cross, 0.02 mm or more and 0.1 mm or less are preferable. If it is thinner than 0.02 mm, mechanical strength will become insufficient, and there exists a possibility that it may deform | transform at the time of thermocompression bonding or lamination of a thermally conductive silicone rubber layer. Moreover, when it becomes thicker than 0.1 mm, the thermal conductivity of the whole sheet | seat will fall by increasing the ratio of the glass cross layer to a silicone rubber sheet for thermocompression bonding.

Although the dip coating method, the knife coating method, the spray coating method, etc. are mentioned as a silicone resin impregnation method with respect to a glass cross, especially when a dip coating method is used, a thin coating layer can be formed favorably.

As the resin to be impregnated into the glass cross, a reinforcing silica-containing silicone rubber composition is preferable. The organopolysiloxane, which is a polymer component of the reinforcing silica-containing silicone rubber composition, is very weak in strength compared to other synthetic rubbers, and is not a level that can be used alone. The strength which can be used is exhibited by adding filler, especially reinforcing silica, to organopolysiloxane.

Organopolysiloxane has the following average composition formula (II)

R _a SiO _{(4-a) / 2} (II)

(Wherein a is a positive number between 1.95 and 2.05)

R represents an unsubstituted or substituted monovalent hydrocarbon group, specifically, an alkyl group such as a methyl group, an ethyl group or a propyl group, a cycloalkyl group such as a cyclopentyl group or a cyclohexyl group, an alke such as a vinyl group or an allyl group Aryl groups, such as a silyl group, a phenyl group, and a tolyl group, or the halogenated hydrocarbon group in which the hydrogen atom of these groups was partially or fully substituted by the chlorine atom, a fluorine atom, etc. are mentioned, Generally, the main chain of organopolysiloxane is dimethylsiloxane. It is preferable that a vinyl group, a phenyl group, a trifluoropropyl group, or the like is introduced into the main chain of the organopolysiloxane. Moreover, what is necessary is just to block the molecular chain terminal into a triorganosilyl group or a hydroxyl group, As this triorgano silyl group, a trimethylsilyl group, a dimethyl vinyl silyl group, a trivinyl silyl group, etc. are illustrated. Moreover, it is preferable that the viscosity of polystyrene conversion by GPC of this component is 200 or more and the viscosity in 25 degreeC by a rotational viscometer is 0.3 Pa * s or more, and when the average polymerization degree is less than 200, the mechanical strength after hardening will fall, There is a risk of falling. The upper limit of the average degree of polymerization is not particularly limited, but is preferably 10,000 or less.

Moreover, it is preferable that this organopolysiloxane has an alkenyl group couple | bonded with at least 2 silicon atoms in 1 molecule, and it is preferable to contain 0.001-5 mol%, especially 0.01-1 mol% vinyl group in R.

Reinforcing silica is mix | blended in order to obtain the silicone rubber excellent in mechanical strength, and it is preferable that the specific surface area by BET method is 50 m <^2> / g or more, especially 100-400 m <^2> / g. Examples of the reinforcing silica include fumed silica (dry silica), precipitated silica (wet silica), and the like. The surface of the reinforcing silica may be hydrophobized with organopolysiloxane, organosilazane, chlorosilane, alkoxysilane, or the like.

Although the addition amount of this reinforcing silica is not restrict | limited, There exists a possibility that sufficient reinforcement effect may not be acquired at less than 5 mass parts with respect to 100 mass parts of organopolysiloxane, and when it is more than 100 mass parts, moldability may worsen. Therefore, it is the range of 5-100 mass parts, Preferably it is the range of 20-80 mass parts.

Moreover, as needed, various additives, such as a thermally conductive filler, a coloring pigment, a heat resistance improving agent, a flame retardancy improving agent, and a hydroxyl agent, or various alkoxysilanes, diphenylsilanediol, carbon functional silane, silanol-group containing siloxane, etc. as reinforcing silica dispersing agents, etc. You may add.

The reinforcing silica-containing silicone rubber composition can be obtained by uniformly mixing the above components using a kneader such as two rolls, a half-barrier mixer, a kneader, and a planetary mixer, and heat treatment at a temperature of 100 ° C or higher as necessary.

As a hardening | curing agent which hardens a reinforcement silica compounding silicone rubber composition and uses it as a rubber elastic body, what is necessary is just the conventionally well-known thing normally used for hardening of silicone rubber, and this is di-t- butyl peroxide used for radical reaction, 2, 5- dimethyl Organic peroxides such as -2,5-di (t-butylperoxy) hexane and dicumylperoxide, and when the organopolysiloxane has an alkenyl group as an addition reaction curing agent, at least two hydrogen atoms bonded to silicon atoms in one molecule Consisting of an organohydrogenpolysiloxane and a platinum group metal catalyst to be contained, and when the organopolysiloxane contains a silanol group as a condensation reaction curing agent, hydrolyzable groups such as alkoxy groups, acetoxy groups, ketooxime groups, propenoxy groups, etc. An organosilicon compound etc. which have two or more are illustrated, What is necessary is just to add this addition amount like a normal silicone rubber.

As the reinforcing silica-containing silicone rubber composition, any of a mirrorable type silicone rubber composition and a liquid type silicone rubber composition may be used. From the point of workability and moldability, an organic peroxide curable or addition reaction curable silicone rubber composition of reinforcing silica is preferable.

The silicone resin impregnated into the glass cross is preferably selected from a thin, stable resin coating glass cross. Although a material having a high thermal conductivity may be selected, the overall thermal conductivity depends on the glass cross rather than the silicone resin, and when the thermal conductive powder is increased, the glass cross may be clogged and the coated surface may be rough or the hardness may rise to uniform pressure. There is a fear that transmission may be impaired.

It is preferable that the thermally conductive silicone rubber layer laminated on the base material cross layer has a thermal conductivity of 0.3 W / mK or more and 5 W / mK or less (ASTM E 1530), in particular 0.5 to 3 W / mK. If the thermal conductivity is less than 0.3 W / mK, it is necessary to increase the thermal compression temperature or lengthen the compression time, which may be disadvantageous in terms of efficiency. Even if it exceeds 3 W / mK, since the thermal conductivity of the base material cross layer is limited, a particularly advantageous effect cannot be expected.

The thermally conductive silicone rubber composition for forming the thermally conductive silicone rubber layer is at least one selected from carbon, metals, metal oxides, metal nitrides and metal carbides in 100 parts by mass of the organopolysiloxane similar to the resin impregnated in the glass cross. What is obtained by adding 10-1,600 mass parts of is preferable. Specific examples thereof include silver powder, copper powder, iron powder, nickel powder and aluminum powder in metals, oxides such as zinc, magnesium, aluminum, silicon and iron in metal oxides, nitrides such as boron, aluminum and silicon in metal nitrides and metal carbides. Examples thereof include carbides such as silicon and boron.

As needed, you may add various alkoxysilanes, diphenylsilanediol, carbon functional silane, silanol-group containing siloxane, etc. as various additives, such as a coloring pigment, a heat resistance improving agent, a flame retardancy improving agent, a hydroxyl agent, or a dispersing agent.

The thermally conductive silicone rubber composition can be obtained by uniformly mixing the above components using a kneader such as a two-roll roll, a half-barrier mixer, a kneader, and a planetary mixer, and heat-treating at a temperature of 100 ° C or higher as necessary.

As a hardening | curing agent which hardens a thermally conductive silicone rubber composition and uses it as a rubber elastic body, what is necessary is just the conventionally well-known thing normally used for hardening of silicone rubber, and this is di-t- butyl peroxide used for radical reaction, 2, 5- dimethyl-2. Organic peroxides such as, 5-di (t-butylperoxy) hexane and dicumylperoxide, and when the organopolysiloxane has an alkenyl group as an addition reaction curing agent, it contains two or more hydrogen atoms bonded to silicon atoms in one molecule. 2 or more hydrolyzable groups, such as an alkoxy group, an acetoxy group, a ketooxime group, and a propenoxy group, when organopolysiloxane contains a silanol group as a condensation reaction hardening | curing agent, and a condensation reaction hardening | curing agent. The organosilicon compound etc. which have a branch are illustrated, What is necessary is just to add this addition amount like a normal silicone rubber.

As the thermally conductive silicone rubber composition, any of a mirrorable type silicone rubber composition and a liquid type silicone rubber composition may be used. From the point of workability and moldability, an organic peroxide curable or addition reaction curable heat conductive silicone rubber composition is preferable.

The hardness of the thermally conductive silicone rubber is preferably 30 or more and 90 or less (type A durometer as defined in JIS K6253). Moreover, when the hardness is 40 or more and 60 or less, the position shift of COF is reduced and it is especially suitable as a high precision liquid crystal panel use.

As a lamination | stacking method of the thermally conductive silicone resin with respect to a base cross, the knife coat method, the comma coat method, the calender coat method, etc. are mentioned, A coating and baking are performed continuously. In particular, in the calender coating method, a solvent-free coating can be performed, and the amount of organic solvent used can be reduced.

It is preferable that the thickness of the whole silicone rubber sheet for thermocompression bonding is 0.1 mm or more and 1 mm or less. It is difficult to manufacture a structure less than 0.1 mm. Moreover, when it exceeds 1 mm, since the whole heat conductivity falls, it is necessary to raise the set temperature of a crimping machine, and also the workability also worsens because the mass per unit length becomes heavy.

It is also conceivable to laminate a thermally conductive silicone rubber layer on a heat resistant film (e.g., a polyimide film) as a means of uniformly conveying pressure, but it is necessary to apply a primer, the film is easily deformed with a small number of thermocompression bonding, and glass. The drawback is that the unevenness absorbing ability is lower than that of the base cross having a cross-treated silicone resin on the cross.

(Example)

Hereinafter, although an Example and a comparative example are given and this invention is demonstrated concretely, this invention is not limited to the following Example.

[Examples 1-4, Comparative Examples 1-4]

(Glass cross)

As shown in Tables 1 and 2, each type of glass crosses and untreated plain-woven glass crosses that were opened by the columnar high-pressure water jetting method were prepared, and the silicon eye treatment was performed in the following procedure.

(Eye treatment)

100 parts by mass of polymethylvinylsiloxane (having 0.15 moles of vinyl groups in the side chain to 100 moles of dimethylsiloxane, average polymerization degree of about 5,000), 3 parts by mass of dimethoxydimethylsilane, 1 part of hydrochloric acid (pH3.5) In addition, 40 mass parts of nipsil VN3 (wet silica brand made by Nippon Silica Co., Ltd.) was heated and mixed at 180 degreeC for 1 hour by kneader. After dissolving 100 mass parts of obtained rubber compounds well to 300 mass parts of xylene, 0.2 mass parts of 1-ethynyl- 1-cyclohexanol, 0.2 mass parts of vinylsiloxane complexes (platinum content 0.5 mass%) of a chloroplatinic acid, and the following formula ( 1.0 parts by mass of dimethylpolysiloxane having a hydrogen atom bonded directly to the silicon atom indicated by III) was sequentially added to obtain a coating liquid.

This coating liquid was continuously dip-coated in the vinyl trimethoxysilane-treated glass cross, it was made to harden by passing through the inside of 150 degreeC heating furnace for 5 minutes, and the base material cross was obtained.

(Combination of Thermally Conductive Silicone Rubber Composition)

Three types of polymethylvinylsiloxane (having 0.025 mol of vinyl group at the terminal, 0.15 mol of vinyl group at the side chain, 0.5 mol of vinyl group at the side chain, and average degree of polymerization with respect to 100 mol of dimethylsiloxane units) About 5,000), acetylene black (average particle diameter 35nm, BET specific surface area 130m ² / g), hydrophobic silica (BET specific surface area 120m ² / g), cerium oxide (BET specific surface area 140m ² / g) in combination with two rolls, The mixture was kneaded to obtain a rubber compound. The compounding quantity of each component was adjusted so that finishing hardness might be 50 and all thermal conductivity became 0.5 W / mK.

0.2 mass parts of 1-ethynyl-1-cyclohexanol, 0.2 mass parts of vinylsiloxane complexes (platinum content 0.5 mass%) of 1-ethynyl- 1-cyclohexanol, and after mixing kneading | mixing uniformly by adding 300 mass parts of toluene to 100 mass parts of obtained compounds, the said formula ( 1.0 parts by mass of dimethylpolysiloxane having a hydrogen atom bonded directly to the silicon atom represented by III) was added sequentially.

(Molding conditions)

Next, using a knife coater, the compound was coated on the base cross such that the thickness of the base cross and the thermally conductive silicone rubber layer was 0.25 mm, and the mixture was cured by passing through a 160 ° C heating furnace for 5 minutes (Tables 1 and 2). In the rubber lamination).

In addition, the single-layered silicone rubber sheet used to overlap with the base material cross was transferred to PET using a calender molding machine in the same manner so as to have a finish thickness of 0.15 mm, and cured by passing through a 160 ° C heating furnace for 5 minutes. After that, PET was peeled off. This was laminated | stacked without adhere | attaching on the base material cross (in Table 1 and 2, it describes using two sheets).

(Evaluation by pressure-sensitive paper)

In order to evaluate whether pressure is applied evenly at the time of pressurization, a pressure-sensitive paper (for product name Freescale medium pressure manufactured by FUJIFILM Corporation) was placed on a flat glass substrate, and the glass cross surface faced downward on the silicon rubber sheet for thermal compression produced thereon. It piled up so that 5 MPa and 10 second pressurization could be carried out by the pressurization tool (cross section 3mm * 200mm) of normal temperature from it. The discoloration state of the pressure-sensitive paper was evaluated visually. The results are shown in Tables 1 and 2.

(Evaluation by COF compression)

A glass substrate provided with a copper electrode having a 25 μm pitch and a C0F having a thickness of 35 μm are sandwiched with an anisotropic conductive adhesive film having a thickness of 22 μm, and the silicon rubber sheet for thermocompression bonding formed thereon is laminated so that the glass cross face faces downward, Furthermore, it presses by 5 MPa and 15 second by the pressurizing tool (adjusted so that the reaching temperature of an anisotropic conductive adhesive film may be 180 degreeC) heated from above, and observes by the microscope how much the electrode of the COF terminal shifts before and after crimping | compression-bonding. did. The degree of electrode shift along the crimp was evaluated by A (less than 5 µm), B (more than 5 µm and less than 10 µm), and C (more than 10 µm).

When the glass cross layer of 50 micrometers in thickness and 35 micrometers was used as a base material, the position shift of the COF crimping test was improved by opening the glass cross, and it was shown that it is effective for high precision. The results are shown in Tables 1 and 2.

Example 1 Example 2 Comparative Example 1 Comparative Example 2 Used yarn ECD450 1/0 ECD450 1/0 ECD450 1/0 ECD450 1/0 Tilt [piece / 25mm] 60 60 60 60 Weft [piece / 25mm] 60 60 60 60 Thickness [㎛] 50 50 50 50 Open island treatment has exist has exist none none Porosity [%] 3 3 25 25 Eye candy silicon silicon silicon silicon With rubber lamination
Is it two pieces use Rubber lamination 2 sheets Rubber lamination 2 sheets Pressure-sensitive paper evaluation Good Good joke
(Cross-Eye Warrior) joke
(Cross-Eye Warrior) COF Crimp Test A
(~ 5 μm) A
(~ 5 μm) B
(Less than 5 ~ 10㎛) C
(More than 10㎛)

Example 3 Example 4 Comparative Example 3 Comparative Example 4 Used yarn ECD900 1/0 ECD900 1/0 ECD900 1/0 ECD900 1/0 Tilt [piece / 25mm] 55 55 55 55 Weft [piece / 25mm] 55 55 55 55 Thickness [㎛] 35 35 35 35 Open island treatment has exist has exist none none Porosity [%] One One 22 22 Eye candy silicon silicon silicon silicon With rubber lamination
Is it two pieces use Rubber lamination 2 sheets Rubber lamination 2 sheets Pressure-sensitive paper evaluation Good Good joke
(Cross-Eye Warrior) joke
(Cross-Eye Warrior) COF Crimp Test A
(~ 5 μm) A
(~ 5 μm) B
(Less than 5 ~ 10㎛) B
(Less than 5 ~ 10㎛)

11 ... Materials cross
11a... glass fiber
11b... Silicone resin
12... Thermally Conductive Silicone Rubber Layer

Claims (5)

A silicone rubber sheet for thermocompression bonding, wherein a glass cross processed flat or open to the heat conductive silicone rubber layer is laminated. The silicone rubber sheet for thermocompression bonding according to claim 1, wherein the flat or opened glass cross is 10% or less at a porosity represented by the following formula (I).
Porosity = [(b ₁ × b ₂ ) / (a ₁ × a ₂ )] × 100 (I)
(Wherein a ₁ is the mean value (μm) of the center-to-center length of adjacent warp yarns, a ₂ is the mean value (μm) of the center-to-center length of adjacent weft yarns, and b ₁ is the mean value (μm) of the gap between adjacent warp yarns. ), B ₂ represents an average value (μm) of the gap between the adjacent weft yarns.) The silicone rubber sheet for thermocompression bonding according to claim 1 or 2, wherein the glass cross is blinded with a silicone resin, and a thermally conductive silicone rubber layer is laminated on at least one surface thereof. The thickness of the said flat or open-processed glass cross is 0.02 mm or more and 0.1 mm or less, The silicone rubber sheet for thermocompression bonding of Claim 1 or 2 characterized by the above-mentioned. The silicone rubber sheet for thermocompression bonding according to claim 1 or 2, wherein the thermally conductive silicone rubber layer has a thermal conductivity of 0.3 W / mK or more and 5 W / mK or less and a hardness of 30 or more and 90 or less.

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