JP2878932B2 - Silicone adhesive tape for silicone rubber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silicone adhesive tape for silicone rubber having improved adhesion to silicone rubber.
It is about a loop .

[0002]

2. Description of the Related Art Conventionally, (CH ₃ ) ₃
There is known a silicone pressure-sensitive adhesive comprising a polysiloxane having _0.5 unit of SiO and ₂ units of SiO _2, which is a condensation product of so-called MQ resin and dimethyl silicone raw rubber. This adhesive is
Crosslinking with a peroxide is carried out for the purpose of increasing the adhesive strength, cohesive strength, etc., but the adhesive strength with silicone rubber is not sufficient.

[0003] Since peroxide crosslinking is carried out at a high temperature such as 180 to 200 ° C, it is disadvantageous in terms of application to a substrate having a low heat distortion temperature and energy cost. Therefore, alkenyl group-containing organopolysiloxane, MQ resin and Si- A low-temperature-curable addition-type silicone pressure-sensitive adhesive comprising an H-group-containing polysiloxane has been proposed (see JP-A-63-22886). This adhesive gives stable adhesion to various metals and tape substrates,
Adhesion to silicone rubber is considerably poor.

Further, a silicone rubber composition and a composition comprising a silicone-based pressure-sensitive adhesive and a boric acid compound such as methyl borate, propyl borate, butyl borate and triethyl borate are molded and cured to form an adhesive silicone molding. A method for obtaining a body is disclosed in JP-A-2-269157, and it is known that these boric acid compounds have a self-fusing property between a silicone rubber and a silicone adhesive. However, when these alkyl borates are added to a silicone adhesive and affixed to silicone rubber, they are exposed to high temperatures of 150 ° C or higher due to their poor heat resistance, although their adhesion at room temperature is excellent. Cohesive failure occurs, and cannot be said to be a good silicone pressure-sensitive adhesive composition.

[0005]

From 0007] The situation described, the present invention is the adhesive strength, the silicone rubber silicone adhesive tape which in particular using silicone adhesive composition the adhesive force is improved at high temperature to silicone rubber It was made to provide.

[0006]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, the silicone pressure-sensitive adhesive composition containing an organosilicon compound having a BO-Si bond shows excellent characteristics. The present inventors have found that there is a possibility that the problem can be solved by any of addition-type crosslinking and peroxide crosslinking, and further studied other components to reach the present invention.

That is, the gist of the present invention is to provide (A) one or more kinds selected from an organopolysiloxane represented by the following general formula (1) and an organopolysiloxane represented by the following general formula (2):

Embedded image (Provided that R ¹ in the formula is a monovalent hydrocarbon group containing no alkenyl unsaturated group, n is an integer of 0 to 3, k and q are each 0 or a positive integer, and n = 0 q is an integer of 2 or more;
j and p are integers of 100 or more. (B) R ² ₃ SiO _0.5 units (where R ² is a monovalent hydrocarbon group) and SiO ₂ units, and R ² ₃ SiO _0.5 units / SiO ₂ (C) an organohydrogenpolysiloxane containing at least two hydrogen atoms bonded to silicon atoms in one molecule, (D) boric acid, Formula (3) R ⁵ _a (R ⁶ O) _b SiO _{(4-ab) / 2} (3) (where R ⁵ is a monovalent hydrocarbon group, R ⁶ is hydrogen or monovalent hydrocarbon group)
Valent hydrocarbon groups, a and b are 0 <a <4, 0 <b <4 and
An organosila represented by 0 <a + b ≦ 4)
BO-Si , which is a reaction product with
A silicone pressure-sensitive adhesive composition comprising an organosilicon compound having a bond and (E) a platinum-based catalyst, or

(A) an organopolysiloxane represented by the following general formula ( 4 ):

Embedded image (Where R ³ is a monovalent hydrocarbon group and r is an integer of 100 or more). (B) _0.5 units of R ⁴ ₃ SiO (where R ⁴ is a monovalent hydrocarbon group) and SiO It consists of _two units, R ⁴ ₃ SiO _0.5 units / SiO ₂ molar ratio units organopolysiloxane in the range of 0.5 to 1.2, (d) boric acid and the following general formula _{^{(3) R 5 a (R}} 6 O ) _b SiO _{(4-ab) / 2} (3) (where R ⁵ is a monovalent hydrocarbon group, R ⁶ is hydrogen or
Valent hydrocarbon groups, a and b are 0 <a <4, 0 <b <4 and
An organosila represented by 0 <a + b ≦ 4)
BO-Si , which is a reaction product with
A silicone pressure-sensitive adhesive composition comprising: an organosilicon compound having a bond; and (e) an organic peroxide.

[0009] There an adhesive layer using a silicone pressure-sensitive adhesive composition of the silicone rubber <br/> silicone pressure-sensitive tape comprising on a support tape, a.

Hereinafter, the present invention will be described in detail. Generally, a high-viscosity diorganopolysiloxane such as the component (A) or the component (a) and MQ as the components (B) and (b)
Metals, plastics, papers, ceramics, etc. can be adhered by the composition obtained by mixing or reacting the resin, and vulcanization (crosslinking) can be performed with the components (C) and (E) or the component (e). ) Can increase the cohesive strength of the adherend, but the silicone rubber has poor adhesion and weak cohesive strength. Therefore, the present inventors have studied to improve the adhesion and cohesion to silicone rubber, and by adding and vulcanizing an organosilicon compound having a predetermined BO-Si bond, any of the above vulcanization systems It has been found that excellent characteristics can be obtained also in the above.

That is, the silicone rubber of the present invention
The cone adhesive tape is composed of (A) a high-viscosity organopolysiloxane, (B) an organopolysiloxane (MQ resin) for imparting tackiness, (C) an organohydrogenpolysiloxane, and (D) a component. Containing an organosilicon compound having a BO-Si bond and a platinum catalyst as the component (E), or a high-viscosity organopolysiloxane as the component (a), an MQ resin as the component (b), (d)
An organosilicon compound having a BO-Si bond as a component and (e)
Pressure sensitive adhesive composition containing organic peroxide as component
Is provided on a support tape .

First, the composition containing the components (A) to (E) will be described. As the organopolysiloxane of the component (A), one or more of the organopolysiloxanes represented by the following general formula (1) and the organopolysiloxane represented by the general formula (2) are selected and used.

Embedded image

R ¹ in the general formulas (1) and (2) is a monovalent hydrocarbon group containing no alkenyl unsaturated group, and specifically includes a methyl group, an ethyl group, a propyl group and a butyl group. alkyl group, a phenyl group, aryl groups such as tolyl group, a benzyl group, aralkyl groups such as phenethyl group, chloropropyl group, a haloalkyl group such as a trifluoropropyl group and the like, all of the same R ¹ in one molecule May be different, and there may be different ones. Particularly, industrially, a methyl group is mainly preferable, and a phenyl group is also preferable. k and q are each 0 or a positive integer. When n = 0, q is an integer of 2 or more. When n is 1 or more and 3 or less, q may be an integer of 0 to 1000. It may be set to 0 to 20. In any case, it can be used as long as there are a plurality of vinyl groups in one molecule which can be crosslinked with the Si-H groups in the organohydrogenpolysiloxane of the component (C).

The length of the siloxane chain is an integer of 100 or more, preferably 200 to 100,000, as j and p in the formulas (1) and (2). When j and p are less than 100, the adhesive properties are poor and the object of the present invention cannot be achieved.
The viscosity of the component (A) is preferably 20000 centipoise or more, particularly 1,000,000 centipoise or more, and specifically, organopolysiloxane in a form usually called silicone raw rubber is preferable. If j and p are 100 or more, oily organopolysiloxane can be used in terms of adhesive properties.

[0015] (B) organopolysiloxane of the component is a component which imparts adhesiveness after vulcanization, as the R ² ₃ S
It consists of iO _0.5 and SiO ₂ units. R ² in the formula is a monovalent hydrocarbon group, but also contains a small amount of a silanol group. The silanol group preferably coexists with a monovalent hydrocarbon group. As the monovalent hydrocarbon group, a methyl group,
Examples include an alkyl group such as an ethyl group and a propyl group, a vinyl group, and an alkenyl group such as an allyl group, and R ^{2 in} one molecule may be the same or different.
A methyl group and a vinyl group are preferable, and it is particularly preferable that 95 mol% or more of all R ² groups is a methyl group. Also, R ² ₃ SiO
The molar ratio of _0.5 units / SiO ₂ units is from _{0.5 to} 1.2, but is preferably in the range of from 0.65 to 0.95. If this ratio is less than 0.5, the adhesive strength and tack may decrease,
If it exceeds 1.2, the cohesive strength may decrease. The component (B) is selected from one or two or more components, and the amount of the component (B) is 50 to 250 parts by weight based on 100 parts by weight of the component (A). Parts, especially 100-200
It is preferable to set the range of parts.

The organohydrogenpolysiloxane of the component (C) functions as a crosslinking agent, and the hydrogen atom bonded to the silicon atom undergoes a hydrosilylation reaction with the vinyl group in the component (A) to crosslink. (C) Component 1
There is no particular limitation as long as the molecule contains at least two hydrogen atoms directly bonded to a silicon atom, and examples thereof include those represented by the following formula. (CH ₃ ) ₃ SiO [Si (CH ₃ ) ₂ O] _a [SiH (CH ₃ ) O] _b Si (CH ₃ ) ₃ , (CH ₃ ) ₃ Si
O [SiH (CH ₃ ) O] _c Si (CH ₃ ) _3, [SiH (CH ₃ ) O] _d : cyclic siloxane, (CH ₃ ) ₂ HSiO [Si (CH ₃ ) ₂ O] _e SiH (CH ₃ ) ₂ , (CH ₃ ) ₂ HSiO (S
i (CH ₃ ) ₂ O] _f [SiH (CH ₃ ) O] _g SiH (CH ₃ ) ₂ (where a, b, c, e, f and g are integers of 2 or more;
d represents an integer of 3 or more. Further, it includes (CH ₃ ) ₂ HSiO _0.5 unit and / or (CH ₃ ) HSiO unit, and further includes (CH ₃ ) ₃ SiO _0.5 unit, (CH ₃ ) ₂ SiO unit, and (C ₆ H)
₅ ) ₂ SiO units, (CH ₃ ) SiO _1.5 units, (C ₆ H ₅ ) SiO _1.5 units and
Hydrogenpolysiloxane having at least one unit selected from SiO ₂ units can be used.

One or more components (C) are selected and blended. The blending amount is the total number (moles) (H) of hydrogen atoms directly bonded to silicon atoms in the component (C). And the ratio (H) of the number of moles (Vi) of all vinyl groups in the component (A)
/ (Vi) is preferably in the range of 0.1 to 15, particularly 1 to 10. When the ratio is less than 0.1, the crosslinking density is reduced and the cohesive force is reduced. When heated, the adhesive may foam due to cracking of the component (A). When the ratio exceeds 15, the tack and the adhesive force are reduced and hydrogen gas is reduced. Foaming may easily occur.

The component (D), an organosilicon compound having a BO-Si bond, is a component for improving the adherence to an adherend, particularly silicone rubber, and is used in combination with the silicone rubber used in the present invention. This is to fuse the adhesive. Component (D)
Single-mer, oligomer or polymer is used, the following formula _{^{(3) R 5 a (R}} 6 O) b SiO (4-ab) / 2 ··· (3) ( carbide R ⁵ in the formula monovalent A hydrogen group, R ⁶ is hydrogen or a monovalent hydrocarbon group, a and b are 0 <a <4, 0 <b <4 and 0 <a
Represents a positive number satisfying + b ≦ 4. Reaction products of organosilane or organopolysiloxane with borate der represented by)
You .

In the formula, R ⁵ is an alkyl group such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group or an isobutyl group; an aryl group such as a phenyl group or a tolyl group;
An alkenyl group such as a vinyl group or an allyl group is exemplified, and R ⁶ is hydrogen or a methyl group, an ethyl group, a propyl group,
Alkyl group such as isopropyl group, vinyl group, allyl group,
An alkenyl group such as an isopropenyl group is exemplified.
Each of R ⁵ and R ^{6 in} the molecule need not be all the same. The hydroxyl group of boric acid and the R ⁶ O group do not need to be particularly matched, but an equimolar amount or an excess of the R ⁶ O group are preferred in terms of storage stability of the present compound.

Specific compounds include [(CH ₃ ) ₃ SiO] ₃ B, [(CH ₃ ) ₃ SiO] ₂ BOH, [HOSi (CH ₃ ) ₂ O] ₃ B,
[(C ₆ H ₅ ) ₃ SiO] ₃ B, [(CH ₃ ) ₃ SiO] ₂ BOSi (CH ₃ ) ₂ OH, [(C ₆ H ₅ ) ₂ HOSiO] ₃ B, [(C
₆ H ₅ ) ₂ HOSiO] ₂ BOH, CH ₃ SiO _1.5・ BO _1.5, C ₆ H ₅ SiO _1.5・ BO _1.5 , (CH ₃ ) ₃ SiO _0.5・ (C
H ₃ ) ₂ SiO ・ BO _1.5 , CH ₃ SiO _1.5・ (CH ₃ ) ₂ SiO ・ BO _1.5 , CH ₃ SiO _1.5・ SiO ₂・ BO _1.5 , n
-C ₄ H ₉ SiO _1.5・ BO _1.5 , nC ₅ H ₁₁ SiO _1.5・ BO _1.5 , cyclopentyl-SiO _1.5・ BO _1.5 , iC
₃ H ₇ SiO _1.5・ BO _1.5 , iC ₃ H ₇ SiO _1.5・ (CH ₃ ) ₂ SiO ・ BO _1.5 , cyclohexyl-SiO _1.5・ BO
_1.5 , iC ₃ H ₇ SiO _1.5・ CH ₃ SiO _1.5・ BO _1.5 , iC ₄ H ₉ SiO _1.5・ BO _1.5 , iC ₄ H ₉ SiO _1.5・ CH ₃ SiO _1.5・ BO _1.5 , iC ₄ H ₉ SiO _1.5・ ( CH ₃ ) ₂ S
iO.BO _{1.5 and the} like are exemplified.In particular, the reaction product of a silane having an isopropyl group, an isobutyl group, a phenyl group or the like and boric acid, or the reaction product of a long-chain siloxane and boric acid is hardly hydrolyzed. Things. That is, hydrolysis is unlikely to occur between the time when the pressure-sensitive adhesive composition is applied to the substrate under high temperature and high humidity and the crosslinking and curing are performed, and boric acid insoluble in organopolysiloxane is hardly generated.

As the component (D), one or more components are selected and blended. The amount of the component (D) is based on 100 parts of the component (A).
The component is preferably used in an amount of 0.3 to 30 parts, particularly 0.5 to 20 parts. When the amount is less than 0.3 part, the adhesiveness to the silicone rubber is poor, and when it exceeds 30 parts, the compatibility with the organopolysiloxane is poor and the appearance of the cured adhesive may become cloudy.

The platinum catalyst of component (E) is a catalyst for accelerating the hydrosilylation reaction, and may be platinum metal or a platinum compound. Specifically, chloroplatinic acid, a complex of chloroplatinic acid and an olefin, Examples thereof include complexes with vinylsiloxane. One or more components (E) are selected and added, and the amount of addition is preferably 1 to 5000 ppm, more preferably 5 to 2000 ppm, based on the total amount of the components (A) to (D). If the added amount is less than 1 ppm, the crosslinking density may be low and the cohesive strength may be reduced. If the added amount is more than 5000 ppm, the tack and the adhesive strength may be reduced and the pot life may be shortened.
It is economically disadvantageous. Furthermore, various ethynyl compounds, amine compounds, phosphorus compounds and the like can be added as an inhibitor of the addition reaction (hydrosilylation reaction) for the purpose of extending the pot life.

Generally, to obtain the pressure-sensitive adhesive composition used in the present invention, first, the components (A) and (B) are mixed and reacted at 25 ° C. to 150 ° C. for 1 hour to 48 hours. At this time, an alkali condensation catalyst and a diluting solvent may be used. Next, the components (d) and (e) are mixed with the obtained reaction product.

Next, the composition containing the components (a) to (e) will be described. The component (a) has the general formula ( 4 ) as described above.

Embedded image Wherein R ³ is a monovalent hydrocarbon group, and r is an integer of 100 or more. The R ³ are the same and alkenyl groups as in R ¹ in the component (A) is exemplified. If r is less than 100, the adhesive properties are poor and the object of the present invention cannot be achieved. The component (a) is the same as the component (A).
Organopolysiloxanes in the form of raw rubber having a 20,000 centipoise or more, particularly a million centipoise or more, are preferred. For other components, the same concept as in the case of the component (A) is applied.

As the MQ resin of the component (b), those having the same range as in the case of the component (B) are used. As the organosilicon compound having a BO-Si bond of the component (d), a compound having the same range as that of the component (D) is used, and this component is a composition containing the components (a) to (e). Also works effectively as in the case of the composition containing the components (A) to (E).

The component (e) is a vulcanizing agent for curing the components (a) and (b), and is not particularly limited as long as it is an organic peroxide. This includes, for example, benzoyl peroxide, cumyl peroxide, t-butyl cumyl peroxide, t-butyl peroxide, 2,4-dichlorobenzoyl peroxide, peroxide
t-butyl isobutyrate, t-butyl benzoate peroxide, t-butyl-2-ethylhexarate, 2,2-bisperoxide t-butyloctane, 1,1-bisperoxide t-butylcyclohexane, 2,5-dimethyl-2,5-dibenzoyl hexane and the like. As the component (e), one or two or more components are selected and added.
0.5 to 5% by weight, especially 1 to 3% by weight, based on the total amount of components
If the addition amount is less than 0.5% by weight, the crosslinking density tends to be low and the cohesive strength tends to decrease. If the addition amount exceeds 5% by weight, tackiness and adhesive strength decrease and peroxide decomposition residues remain. May be easier.

In general, to obtain the pressure-sensitive adhesive composition used in the present invention, first, the components (a) and (b) are mixed and reacted at 25 ° C. to 150 ° C. for 1 hour to 48 hours. At this time, an alkali condensation catalyst and a diluting solvent may be used. Next, the components (d) and (e) are mixed with the obtained reaction product.

The composition used in the present invention is used without solvent or diluted with a solvent. For the purpose of improving coatability and controlling the film thickness, it may be diluted with a solvent such as toluene, xylene, ethylbenzene, hexane, heptane, octane, hexamethyldisiloxane, octamethylcyclotetrasiloxane, ethyl acetate, methyl ethyl ketone.

[0029] The thus shea recone adhesive composition obtained, if to form a pressure-sensitive adhesive layer was coated and cured to various substrates, it is possible to affix the silicone rubber, excellent adhesion properties can get. As this substrate, for example, polyester, polytetrafluoroethylene, polyimide,
Various materials such as polyamide, polyetheretherketone, plastic films such as polyphenylene sulfide, paper such as Japanese paper and synthetic paper, cloth, glass wool, and metal foil can be used. In the case of the composition containing the components (A) to (E), the curing condition is 100 to 130 ° C. for 1 to 3 minutes. In the case of the composition containing the components (a) to (e), the curing condition is 130. A temperature of ~ 200 ° C for 1-15 minutes is generally used.

According to the silicone pressure-sensitive adhesive composition used in the present invention , a decrease in cohesive force, particularly at high temperatures, can be suppressed, and excellent properties can be obtained with respect to adhesion to silicone rubber.
This is considered to be due to the self-fusing property of the boric acid compound to the organopolysiloxane, and particularly to the fact that the BO-Si bond is thermally stable and hard to crack even when heated. Therefore, the silicone adhesive tape for the silicone rubber of the present invention is used.
The loop is suitable for applications such as heat-resistant adhesive tapes and labels.

[0031]

【Example】

(Example 1) Consisting of _0.5 units of (CH ₃ ) ₃ SiO and ₂ units of SiO ₂ ,
Methylpolysiloxane whose molar ratio is 0.75: 1.0 1
50 parts, dimethylpolysiloxane blocked with dimethylvinylsiloxy groups at both ends (vinyl content 0.001 mol%, relative viscosity
2.8) Mix a mixture of 100 parts and 163 parts of toluene at 110 ° C for 6 hours.
After heating and stirring for an hour, the mixture was cooled to obtain a viscous solution. The average composition formula (CH ₃ ) ₃ SiO [(CH ₃ ) H
SiO] ₃₈ 0.11 part of methyl hydrogen polysiloxane represented by Si (CH ₃ ) ₃ , [(CH ₃ ) ₂ SiO] _0.8 (iC ₄ H ₉ SiO _1.5 ) _0.1 (BO
_1.5 ) 5 parts of a boron siloxane represented by _0.1 and 5 parts of a 0.5% isopropyl alcohol solution of chloroplatinic acid were mixed to obtain a silicone adhesive-1 having a nonvolatile content of 60%. Next, the silicone pressure-sensitive adhesive-1 was applied to a thickness of 50 μm and a width of 2.5 cm.
The resulting polyimide film was coated so as to have a dry film thickness of 40 μm, and then heated at 130 ° C. for 1 minute to prepare a polyimide base adhesive tape.

Example 2 110 parts of methylpolysiloxane consisting of _0.5 units of (CH ₃ ) ₃ SiO and ₂ units of SiO ₂ and having a molar ratio of 0.75: 1.0, dimethylpolysiloxane having both ends hydroxyl-blocked (relative viscosity 2.8) 100 parts and toluene 1
After heating and stirring the mixture of 45 parts at 110 ° C. for 5 hours, the mixture was cooled to obtain a viscous solution. For 100 parts of solid content of this solution,
[(CH ₃ ) ₂ SiO] _0.8 (iC ₄ H ₉ SiO _1.5 ) _0.1 (BO _1.5 ) 5 parts of a boron siloxane represented by _0.1 and 2 parts of benzoyl peroxide are mixed to form a silicone adhesive having a nonvolatile content of 60%. 2 was obtained.
Next, this silicone pressure-sensitive adhesive-2 was applied in the same manner as in Example 1, and heated at 150 ° C. for 15 minutes to prepare a polyimide-based pressure-sensitive adhesive tape.

Comparative Example 1 A silicone pressure-sensitive adhesive-3 was prepared in the same manner as in Example 1 except that the boron siloxane of Example 1 was not added at all. Using this, an adhesive tape was prepared in the same manner as in Example 1.

Comparative Example 2 A silicone adhesive-4 was prepared in the same manner as in Example 2 except that the boron siloxane of Example 2 was not added at all. Using this, an adhesive tape was prepared in the same manner as in Example 2.

The tack, tackiness, cohesive strength and heat resistance of the pressure-sensitive adhesive tape obtained as described above were measured by the following methods. Table 1 shows the results. <Tack> Place the adhesive layer of the adhesive tape on the slope with an inclination angle of 30 ° and roll the steel ball (SUJ2 of JIS-G-4805) from the 10cm approaching distance to make the adhesive layer 10cm The maximum diameter (inches) of a steel ball that stops within the range (inclination ball tack measurement method). The measurement conditions were a temperature of 25 ± 2 ° C and a relative humidity of 65 ± 5%.

<Adhesive Strength> A pressure-sensitive adhesive tape was coated on a silicone rubber sheet [a KE-951U rubber compound manufactured by Shin-Etsu Chemical Co., Ltd., which was heated and pressed] to a roller coated with a rubber layer having a thickness of about 6 mm. (2000 ± 50 g made of metal) and reciprocated once at a compression speed of 300 mm / min. After standing at 25 ± 2 ° C and 65 ± 5% RH for 24 hours, use an autograph manufactured by Shimadzu Corporation at a speed of 300 mm / min.
The peeling force when peeled in the 80 ° direction was measured.

<Cohesive force> The adhesive tape was bonded in exactly the same manner as the test piece for measuring adhesive force (adhesive area was 25 mm in both length and width), a 1 kg load was applied to the lower end of the adhesive tape, and the adhesive tape was suspended at room temperature for 30 minutes. The subsequent displacement distance was measured with a reading microscope.

<Heat resistance> Lamination was performed in exactly the same manner as the test piece for adhesion measurement (adhesion area was 25 mm in both length and width).
After leaving the adhesive tape for 2 hours in an oven at a temperature of 1 ° C., a load of 1 kg was applied to the lower end of the pressure-sensitive adhesive tape, and the suspension distance was suspended for 30 minutes at room temperature.

[0039]

[Table 1]

[0040]

According to the present invention, there is provided a novel silicone pressure-sensitive adhesive tape for silicone rubber having improved adhesion to silicone rubber. Silicone rubber is often used at high temperatures because the heat resistance is good, when such a pressure-sensitive adhesive tape of the present invention is applied to a silicone rubber, it is suitable for pasted.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B32B 27/00 101 B32B 27/00 101 27/18 27/18 Z C09J 5/00 C09J 5/00 183/04 183/04 183 / 05 183/05 183/07 183/07 (72) Inventor Isamu Moriizumi 1-10, Hitomi, Matsuida-machi, Usui-gun, Gunma Prefecture Inside Silicone Electronic Materials Technology Research Laboratories Shin-Etsu Chemical Co., Ltd. (72) Inventor Mitsuhiro Takarada Gunma 1-10 Hitomi, Matsuida-machi, Usui-gun, Japan Shin-Etsu Chemical Co., Ltd. Silicone Electronic Materials Research Laboratory (56) References JP-A-2-269157 (JP, A) (58) Fields investigated (Int. ⁶ , DB name) C09J 7/02 C09J 5/00 C09J 183/04 C09J 183/05 C09J 183/07

Claims (1)

(57) [Claims] (A) one or more selected from an organopolysiloxane represented by the following general formula (1) and an organopolysiloxane represented by the following general formula (2): (Provided that R ¹ in the formula is a monovalent hydrocarbon group containing no alkenyl unsaturated group, n is an integer of 0 to 3, k and q are each 0 or a positive integer, and n = 0 q is an integer of 2 or more;
j and p are integers of 100 or more. (B) R ² ₃ SiO _0.5 units (where R ² is a monovalent hydrocarbon group) and SiO ₂ units, and R ² ₃ SiO _0.5 units / SiO ₂ (C) an organohydrogenpolysiloxane containing at least two hydrogen atoms bonded to silicon atoms in one molecule, (D) boric acid, Formula (3) R ⁵ _a (R ⁶ O) _b SiO _{(4-ab) / 2} (3) (where R ⁵ is a monovalent hydrocarbon group, R ⁶ is hydrogen or monovalent hydrocarbon group)
Valent hydrocarbon groups, a and b are 0 <a <4, 0 <b <4 and
An organosila represented by 0 <a + b ≦ 4)
BO-Si , which is a reaction product with
A silicone pressure-sensitive adhesive composition comprising an organosilicon compound having a bond and (E) a platinum-based catalyst, or (a) an organopolysiloxane represented by the following general formula (4):
Sun, ## STR2 ## (Where R ³ is a monovalent hydrocarbon group and r is 100 or more
( Integer) (b) _0.5 units of R ⁴ ₃ SiO (where R ⁴ is a monovalent hydrocarbon)
Containing group) and made of SiO ₂ units, R ⁴ ₃ SiO _0.5 units / SiO ₂ single
Organopolicy whose molar ratio is in the range of 0.5 to 1.2
Rokisan, (d) boric acid and the following general formula _{^{(3) R 5 a (R}} 6 O) b SiO (4-ab) / 2 ··· (3) ( where, R ⁵ in the formula is a monovalent hydrocarbon A hydrogen group, R ⁶ is hydrogen or
Valent hydrocarbon groups, a and b are 0 <a <4, 0 <b <4 and
An organosila represented by 0 <a + b ≦ 4)
BO-Si, which is a reaction product with
Adhesive layer using silicone adhesive composition containing organosilicon compound having bond and (e) organic peroxide
On the support tape.
Cone adhesive tape .