JP2003225972A - Silicone rubber composite and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a silicone rubber composite in which a silicone rubber layer is rigidly adhered to one surface of a plastic film and the surface of the rubber layer is coated with an easily releasable protective film, and to provide a method for manufacturing the same. <P>SOLUTION: The silicone rubber composite comprises the silicon rubber layer adhered to one surface of the plastic film, and the surface of the rubber layer is coated with the releasable protective film so that the rubber layer is formed of a silicon rubber obtained by curing a silicon rubber composition containing at least (A) an organopolysiloxane having at least two silicon atom bonding alkenyl groups in one molecule, (B) an adhesive accelerator, (C) an organopolysiloxane having at least two silicon atom bonding hydrogen atoms in one molecule and (D) a catalyst for hydrosilylation reaction, and the adhesive layer of the plastic film to the rubber layer is previously corona treated or plasma treated. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a silicone rubber composite in which a silicone rubber layer is adhered to one surface of a plastic film, and the surface of the silicone rubber layer is covered with a protective film which is easily peeled off, and a method for producing the same. More specifically, regarding the above, the plastic film and the silicone rubber layer are firmly bonded to each other, and the silicone rubber composite in which the protective film is easily peeled from the silicone rubber layer, and such a silicone rubber composite are efficiently produced. On how to do.

[0002]

2. Description of the Related Art A silicone rubber composite in which a silicone rubber layer is adhered to one surface of a plastic film is useful as a spacer or a stress absorber for electric / electronic devices, liquid crystal display devices, etc. No. 314754 discloses an uncrosslinked silicone rubber layer formed between a polyester film coated with a silicone-based primer and a polyester film not coated with the primer, which is irradiated with γ-rays to crosslink the silicone rubber layer. The resulting silicone rubber composite has been proposed.

In this silicone rubber composite, the polyester film not coated with the silicone-based primer can be peeled off from the silicone rubber layer, and the polyester film coated with the primer is integrated with the silicone rubber layer. When the body is subjected to thermal stress or mechanical stress, there is a problem that the primer layer peels off from the film surface, and as a result, the silicone rubber layer peels off from the polyester film.

[0004]

The present inventors have arrived at the present invention as a result of extensive studies to solve the above problems. That is, an object of the present invention is to firmly adhere a silicone rubber layer to one surface of a plastic film, and to cover the surface of the silicone rubber layer with a protective film that is easily peeled off, and such a silicone rubber composite. It is to provide a method for efficiently producing a silicone rubber composite.

[0005]

In the silicone rubber composite of the present invention, a silicone rubber layer is adhered to one side of a plastic film, and the surface of the silicone rubber layer is coated with a peelable protective film. A rubber composite, wherein the silicone rubber layer comprises (A) an organopolysiloxane having at least two silicon-bonded alkenyl groups in one molecule, (B) an adhesion promoter, and (C) at least one molecule. Formed from a silicone rubber obtained by curing a silicone rubber composition comprising at least an organopolysiloxane having two silicon-bonded hydrogen atoms and (D) a catalyst for hydrosilylation reaction, and adhering the plastic film to the silicone rubber layer. The surface is previously corona-treated or plasma-treated.

In the method for producing a silicone rubber composite of the present invention, a silicone rubber composition is cured between a plastic film and a peelable protective film to bond a silicone rubber layer to one side of the plastic film. And a method for producing a silicone rubber composite in which the surface of the silicone rubber layer is coated with the protective film, wherein the silicone rubber composition comprises:
(A) an organopolysiloxane having at least two silicon-bonded alkenyl groups in one molecule, (B) an adhesion promoter, and (C) an organopolysiloxane having at least two silicon-bonded hydrogen atoms in one molecule. And a silicone rubber composition comprising (D) a catalyst for hydrosilylation reaction, and the adhesive surface of the plastic film with the silicone rubber layer is previously corona-treated or plasma-treated.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION First, the silicone rubber composite of the present invention will be described in detail with reference to FIG. In the silicone rubber composite of the present invention, a silicone rubber layer 2 is adhered to one side of a plastic film 1, and the surface of the silicone rubber layer 2 opposite to the plastic film is covered with a peelable protective film 3. ing.

The plastic film 1 is, for example, an olefin resin such as polypropylene (PP);
Cellulosic resins such as cellulose triacetate (TAC); organic resins containing oxygen atoms in the polymer skeleton such as polyethylene terephthalate (PET); organic resins containing sulfur atoms in the polymer skeleton such as polyether sulfone (PES); Others, polyimide resin, polyester resin,
A film made of a polycarbonate resin or an acrylic resin can be used, and a film made of an olefin resin, a cellulose resin, or an organic resin containing an oxygen atom or a sulfur atom in the polymer skeleton is preferable.

The plastic film 1 has a surface to which the silicone rubber layer 2 is adhered in advance to such an extent that when the silicone rubber composition is cured while the film 1 is in contact therewith, the resulting silicone rubber layer 2 is adhered. Corona treated or plasma treated. Therefore, the plastic film 1 and the silicone rubber layer 2 are firmly bonded. The method of corona-treating or plasma-treating the surface of the plastic film 1 is not limited, and for example, a method of keeping the distance between the electrode and the plastic film constant and continuously corona-treating the plastic film while transporting at a constant speed, a plasma irradiation port And the plastic film is kept constant, and the oxygen plasma treatment is continuously performed while the plastic film is conveyed at a constant speed under atmospheric pressure. At this time, both sides of the plastic film may be corona-treated or plasma-treated.

The thickness of the silicone rubber layer 2 is not limited, but is preferably in the range of 10 to 200 μm. The type A durometer hardness specified by JIS K 6253 of the silicone rubber forming the silicone rubber layer 2 is preferably 20 or less. The silicone rubber layer 2 is formed by curing a silicone rubber composition, and the silicone rubber composition comprises (A) an organopolysiloxane having at least two silicon-bonded alkenyl groups in one molecule; B) an adhesion promoter, (C) an organopolysiloxane having at least two silicon-bonded hydrogen atoms in one molecule, and (D) a catalyst for hydrosilylation reaction.

Component (A) is the main component of the above composition and is an organopolysiloxane having at least two silicon-bonded alkenyl groups in one molecule. Examples of the molecular structure of the component (A) include linear, partially branched linear, branched, and network structures. Further, as the silicon atom-bonded alkenyl group in the component (A), vinyl group, allyl group,
Examples of butenyl group, pentenyl group, hexenyl group,
It is preferably a vinyl group. Examples of the bonding position of the alkenyl group include the molecular chain end and / or the molecular chain side chain. Further, as the group bonded to the silicon atom other than the alkenyl group in the component (A), a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group,
Alkyl group such as heptyl group; aryl group such as phenyl group, tolyl group, xylyl group, naphthyl group; aralkyl group such as benzyl group, phenethyl group; chloromethyl group, 3-chloropropyl group, 3,3,3-tri A substituted or unsubstituted monovalent hydrocarbon group such as a halogenated alkyl group such as a fluoropropyl group is exemplified, and a methyl group and a phenyl group are preferable. The viscosity of component (A) at 25 ° C is not limited, but is preferably 100 to 1,000,000 mPa · s.
It is within the range of s.

The component (B) is an adhesion promoter for imparting good adhesion to the silicone rubber obtained by curing the above composition. The component (B) is preferably an organosilicon compound having at least one alkoxy group bonded to a silicon atom in one molecule. Examples of the alkoxy group include a methoxy group, an ethoxy group, a propoxy group, a butoxy group, and a methoxyethoxy group, and a methoxy group is preferable. The groups other than the alkoxy group bonded to the silicon atom of the organosilicon compound include an alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group and a heptyl group; a vinyl group and an allyl group. , Alkenyl groups such as butenyl group, pentenyl group, hexenyl group; aryl groups such as phenyl group, tolyl group, xylyl group, naphthyl group; aralkyl groups such as benzyl group, phenethyl group; chloromethyl group, 3-chloropropyl group, A substituted or unsubstituted monovalent hydrocarbon group such as a halogenated alkyl group such as a 3,3,3-trifluoropropyl group;
Glycidoxyalkyl groups such as 3-glycidoxypropyl group and 4-glycidoxybutyl group; 2- (3,4-epoxycyclohexyl) ethyl group, 3- (3,4-epoxycyclohexyl) propyl group and the like Epoxycyclohexylalkyl group; epoxy group-containing monovalent organic group such as oxiranylalkyl group such as 4-oxiranylbutyl group and 8-oxiranyloctyl group; acryl group-containing monovalent group such as 3-methacryloxypropyl group Organic group; a hydrogen atom and a hydroxyl group are exemplified. This organosilicon compound preferably has at least one alkenyl group or silicon atom-bonded hydrogen atom in one molecule because it participates in the curing reaction of the composition. Further, since the adhesiveness to a corona-treated or plasma-treated plastic film is improved, it is preferable that the organosilicon compound has at least one epoxy group-containing monovalent organic group in one molecule. Examples of such organosilicon compounds include silane compounds, siloxane compounds, and silatrane compounds. Examples of the molecular structure of the siloxane compound include linear, partially branched linear, branched, cyclic, and network structures, and particularly preferably linear, branched, and network structures. .

As such an organosilicon compound, 3
-Glycidoxypropyltrimethoxysilane, 2- (3,
4-epoxycyclohexyl) ethyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, and other silane compounds; at least one silicon atom-bonded alkenyl group or silicon atom-bonded hydrogen atom, and at least one silicon atom-bonded alkoxy group in each molecule. A mixture of a siloxane compound having at least one silicon atom-bonded alkoxy group and a siloxane compound having at least one silicon atom-bonded alkoxy group, and a siloxane compound having at least one silicon atom-bonded hydroxy group and at least one silicon atom-bonded alkenyl group in one molecule. :

[Chemical 1] (In the formula, a, b, and c are positive numbers), a siloxane compound represented by the formula:

[Chemical 2] (In the formula, a, b, c, and d are positive numbers), a siloxane compound represented by the formula:

[Chemical 3] A silatrane compound represented by the formula:

[Chemical 4] The silatrane compound represented by is exemplified. The method for producing the siloxane compound as described above is described in, for example, JP-A-64 / 1988.
Further, the method for producing the silatrane compound as described above is disclosed in, for example, JP-A-10-182669 and JP-A-11-15837.
No. 9 and JP-A No. 11-116584.

The content of the component (B) is an amount sufficient for the silicone rubber obtained by curing the above composition to adhere to the plastic film. For example, it is 0. It is preferably in the range of 01 to 20 parts by weight, and particularly preferably in the range of 0.1 to 10 parts by weight. This is because if the content of the component (B) is less than the lower limit of the above range, the adhesiveness of the obtained silicone rubber to the plastic film tends to decrease, while if it exceeds the upper limit of the above range, Because it is an economy.

The component (C) is a crosslinking agent for the above composition, and is an organopolysiloxane having at least two silicon-bonded hydrogen atoms in one molecule. Examples of the molecular structure of the component (C) include linear, partially branched linear, branched, cyclic, and network structures. In addition, examples of the bonding position of the hydrogen atom bonded to the silicon atom in the component (C) include the molecular chain terminal and / or the molecular chain side chain. Further, as the group bonded to a silicon atom other than a hydrogen atom in the component (C), an alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group and a heptyl group; a phenyl group , Aryl groups such as tolyl group, xylyl group and naphthyl group; aralkyl groups such as benzyl group and phenethyl group; chloromethyl group, 3-chloropropyl group,
A substituted or unsubstituted monovalent hydrocarbon group such as a halogenated alkyl group such as a 3,3,3-trifluoropropyl group is exemplified, and a methyl group and a phenyl group are preferable. Although the viscosity of the component (C) at 25 ° C is not limited,
It is preferably in the range of 1 to 100,000 mPa · s.

The content of the component (C) is an amount sufficient to cure the above composition, and for example, it is based on 1 mol of the total of alkenyl groups contained in the component (A) and the component (B). , (C) is preferably in the range of 0.5 to 10 mol of silicon atom-bonded hydrogen atoms in the component (C). This is because if the content of the component (C) is less than the lower limit of the above range, the composition becomes hard to cure, while if it exceeds the above range, it is uneconomical.

The component (D) is a hydrosilylation reaction catalyst for accelerating the curing reaction of the above composition, and well-known hydrosilylation reaction catalysts such as platinum-based catalysts, rhodium-based catalysts and palladium-based catalysts are exemplified. A platinum-based catalyst is preferable because it has a good reaction rate. Examples of the platinum-based catalyst include platinum fine powder, platinum black, platinum-supported silica fine powder, platinum-supported activated carbon, chloroplatinic acid, alcohol solution of chloroplatinic acid, platinum olefin complex, and platinum alkenylsiloxane complex. .

The content of the component (D) is an amount sufficient to accelerate the curing reaction of the composition. For example, when a platinum-based catalyst is used, in the composition, the platinum in the catalyst is used. The amount of the metal is preferably in the range of 0.01 to 1,000 ppm by weight, and particularly preferably 0.1 to 500 p.
The amount is preferably within the range of pm. this is,
This is because if the content of the component (D) is less than the lower limit of the above range, the curing rate of the composition tends to be significantly slowed down, while on the other hand, even if it exceeds the upper limit of the above range. The reason is that the curing speed is not so improved, and rather the silicone rubber obtained has problems such as coloring.

The above composition contains 3-methyl-1-butyne-3 as a component for controlling the rate of its curing reaction.
-Ol, alkyne alcohol such as 3,5-dimethyl-1-hexyne-3-ol, phenylbutynol; 3-
Methyl-3-penten-1-yne, 3,5-dimethyl-
Enyne compounds such as 3-hexene-1-yne; 1,3,
5,7-Tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane, 1,3,5,7-tetramethyl-1,
3,5,7-tetrahexenylcyclotetrasiloxane,
A reaction inhibitor such as benzotriazole may be contained.
Although the content of this reaction inhibitor is not limited, the component (A) 1
It is preferably in the range of 0.0001 to 5 parts by weight with respect to 00 parts by weight.

In the above composition, other optional components include precipitated silica, wet silica, fumed silica,
Calcined silica, titanium oxide, alumina, glass, quartz, aluminosilicate, iron oxide, zinc oxide, calcium carbonate, carbon black, silicon carbide, silicon nitride, inorganic fillers such as boron nitride, organohalosilane these fillers, Inorganic filler treated with an organosilicon compound such as organoalkoxysilane and organosilazane; organic resin fine powder such as silicone resin, epoxy resin and fluororesin; conductive metal powder such as silver and copper; other, light scattering particles,
Dyes, pigments, flame retardants, etc. may be contained, but when imparting transparency to the silicone rubber composite of the present invention, it is preferable to contain only fumed silica.

Further, the peelable protective film 3 covers the surface of the silicone rubber layer 2 so that dust or water may enter the surface of the silicone rubber layer 2 during storage of the silicone rubber composite of the present invention. This is to prevent the occurrence of such a phenomenon and maintain the adhesiveness of the surface of the silicone rubber layer 2. As the protective film 3, polypropylene (P
E) and other olefinic resins; cellulose triacetate (TA
Cellulose resins such as C); organic resins containing oxygen atoms in the polymer skeleton such as polyethylene terephthalate (PET); organic resins containing sulfur atoms in the polymer skeleton such as polyether sulfone (PES); other polyimide resins , Polyester resin, polycarbonate resin,
An acrylic resin is exemplified.

Next, the method for producing the silicone rubber composite of the present invention will be described in detail. This method is a method of curing a silicone rubber composition between a plastic film and a peelable protective film, wherein the adhesive surface of the plastic film with the silicone rubber layer is corona-treated or plasma-treated in advance. Is characterized by.

The plastic film, protective film, and silicone rubber composition used in this method are as described above. In particular, in the present method, when it is preferable to impart adhesiveness to the silicone rubber surface after peeling off the protective film, the protective film contains an oxygen atom or a sulfur atom in the polymer skeleton, a polyimide resin, It is preferable to use an organic resin such as polyester resin, polyether resin, epoxy resin, phenol resin, polyamide resin, or cellulose resin. The surface of this protective film may be previously treated with an organopolysiloxane having silicon-bonded hydrogen atoms. Further, in this method, when it is preferable not to impart adhesiveness to the surface of the silicone rubber after peeling the protective film, the protective film may be polypropylene (PE).
It is preferable to use a peelable organic resin film made of an organic resin other than the above, such as propylene-based resin.

In this method, a silicone rubber composition is sandwiched between a corona-treated or plasma-treated plastic film and a peelable protective film, and the film thickness is in the range of 10 to 200 μm by, for example, two rolls. The inside of the silicone rubber composition is adjusted so that the silicone rubber composition is cured. This silicone rubber composition is preferably 7
It is heat-cured at 0 to 200 ° C, particularly preferably 70 to 120 ° C.

The silicone rubber composite of the present invention is
It is suitable as spacers and stress absorbers for electronic devices and liquid crystal display devices, and when it has adhesiveness to the silicone rubber surface after peeling off the protective film, it can be used as spacers and stress for electrical and electronic parts such as liquid crystal display devices. It has a feature that it can be easily incorporated as an absorption layer, and if the silicone rubber surface after peeling off the protective film does not have adhesiveness, spacers and stress of electric and electronic parts such as liquid crystal display devices It has a feature that the repair work after it is incorporated as an absorption layer is easy.

[0026]

EXAMPLES The silicone rubber composite of the present invention and the method for producing the same will be described in detail with reference to Examples and Comparative Examples. In addition,
The viscosities in the examples are values at 25 ° C.

[Example 1] 67.4 parts by weight of a dimethylpolysiloxane endblocked by dimethylvinylsiloxy groups at both molecular chain ends having a viscosity of 2000 mPa · s (vinyl group content = 0.23% by weight), average unit formula: [( CH ₂ = CH) (CH ₃ ) ₂ SiO _1/2 ] _0.09 [(CH ₃ ) ₃ SiO
_1/2 ] _0.8 (SiO _4/2 ) _1.0 Organopolysiloxane resin (vinyl group content = 2% by weight) 19.6 parts by weight, and 13 parts by weight fumed silica having a BET specific surface area of 200 m ² / g Parts were put into a Ross mixer, mixed at room temperature for 1 hour, and then mixed under vacuum at 170 ° C. for 2 hours to prepare a semitransparent paste-like silicone rubber base.

100 parts by weight of this silicone rubber base has an average molecular formula:

[Chemical 5] 6 parts by weight of a dimethylsiloxane / methylhydrogensiloxane copolymer having a viscosity of 5 mPa · s and having trimethylsiloxy groups blocked at both ends of the molecular chain (content of silicon-bonded hydrogen atoms = 0.73% by weight), average unit formula :

[Chemical 6] 1 part by weight of organopolysiloxane (vinyl group content = 16% by weight) represented by the formula:

[Chemical 7] 0.5 part by weight of a silatrane derivative represented by the formula 1, and a 1,3-divinyltetramethyldisiloxane complex of platinum (the platinum metal in the complex is 5 parts by weight with respect to the present composition).
(amount of ppm) is mixed uniformly under vacuum to obtain a viscosity of 700
A silicone rubber composition (I) of 00 mPa · s was prepared.

Next, an HV2010 generator manufactured by TANTEC (output voltage 15.5 kV, transfer speed 7.5c)
m / sec, distance between electrode and substrate is 4 mm, corona treated 35 μm thick polyether sulfone (hereinafter P
ES) film with a thickness of 35 μm without corona treatment
The silicone rubber composition (I) was sandwiched between the PES films described in (1) and the thickness of the silicone rubber composition (I) was adjusted to 5 by using a two-roll stainless steel roll with an adjusted clearance.
A silicone rubber composite (I) having PES films on both sides was prepared by heating the silicone rubber composition in a hot air circulation type oven at 80 ° C. for 30 minutes in a state of 0 μm.

Regarding this silicone rubber composite (I), the PES film not treated with corona could be easily peeled from the silicone rubber layer, but the PES film treated with corona was firmly adhered to the silicone rubber layer. Although this composite was bent and stretched, the corona-treated PES film and the silicone rubber layer adhered to each other, and when the silicone rubber layer was forcibly peeled off, the silicone rubber layer broke.

Next, the non-corona treated PES film was peeled off, the silicone rubber layer was attached to the glass plate, and then heated in a hot air circulation type oven at 80 ° C. for 30 minutes. After cooling, when the silicone rubber composite was tried to be peeled from the glass plate, it was firmly bonded to the glass plate.

Further, the transmittance of the silicone rubber composite is
UV-VISIBLE REC made by Shimadzu
ORDING SPECTROPHOMETHER
When measured using (UV-265FW), a wavelength of 4
The respective transmittances at 00 nm, 700 nm, and 900 nm are 85%, 90%, and 93%,
It was highly transparent.

[Example 2] In Example 1, instead of the corona-treated PES film, an HV2010 generator (output voltage: 15.5 kV, manufactured by TANTEC) was used.
Using a 40 μm thick triacetate cellulose (hereinafter TAC) film that was corona-treated at a transport speed of 7.5 cm / sec and a distance between the electrode and the base material of 4 mm, the corona treatment was performed instead of the uncorona-treated PES film. A silicone rubber composite (II) having TAC films on both sides was prepared in the same manner as in Example 1 except that a 40 μm thick TAC film was used.

Regarding this silicone rubber composite (II), the TAC film not treated with corona could be easily peeled from the silicone rubber layer, but the TAC film treated with corona was firmly adhered to the silicone rubber layer. When this composite was bent and stretched, the corona-treated TAC film and the silicone rubber layer adhered to each other, and when the silicone rubber layer was forcibly peeled off, the silicone rubber layer broke.

Next, after peeling off the TAC film not subjected to the corona treatment and sticking the silicone rubber layer on the iron plate,
It heated for 30 minutes in 80 degreeC hot-air circulation type oven. After cooling, when the silicone rubber composite was tried to be peeled from the iron plate, it firmly adhered to the iron plate.

[Example 3] 93.5 parts by weight of a dimethylsiloxane-methylvinylsiloxane copolymer (vinyl group content = 0.13% by weight) having a viscosity of 40,000 mPa · s and trimethylsiloxy groups blocked at both ends of the molecular chain, BET Specific surface area 20
6.5 parts by weight of 0 m ² / g dry silica was put into a Ross mixer and mixed for 1 hour. Then, the mixture was heated and mixed under vacuum at 170 ° C. for 2 hours to prepare a semitransparent paste-like silicone rubber base.

Next, 100 parts by weight of this base was added to the average unit formula:

[Chemical 8] Adhesion promoter (vinyl group content = 16% by weight) 1.0 part by weight, viscosity of 10 mPa · s molecular chain both ends dimethylhydrogensiloxy group blocked dimethylpolysiloxane (content of hydrogen atoms bonded to silicon atom) = 0.17% by weight) 6.0 parts by weight, platinum 1,3-divinyltetramethyldisiloxane complex (the amount of platinum metal in the composition is 5 ppm by weight), and 3-phenyl-1- Butin
0.01 parts by weight of 3-all were uniformly mixed under vacuum to prepare a silicone rubber composition (II) having a viscosity of 100 Pa · s.

Next, an HV2010 generator manufactured by TANTEC (output voltage 15.5 kV, transfer speed 7.5c)
m / sec, the distance between the electrode and the base material is 4 mm), and a polyethylene terephthalate (hereinafter PET) film having a thickness of 50 μm that is corona-treated and a thickness of 5 that is not corona-treated
Silicone rubber composition (II) was sandwiched between 0 μm polypropylene (hereinafter, PP) films, and the thickness of the silicone rubber composition (II) was adjusted to 50 μm by two clearance stainless rolls. , 80 ° C
A silicone rubber composite (III) having a PET film on one side and a PP film on the other side was produced by curing the silicone rubber composition by heating for 30 minutes in the hot air circulation type oven.

Regarding this silicone rubber composite (III), the PP film not treated with corona could be easily peeled off from the silicone rubber layer, but the PET film treated with corona was firmly adhered to the silicone rubber layer. , This composite was bent and stretched, but corona treated P
The ET film and the silicone rubber layer were adhered to each other, and when the silicone rubber layer was forcibly peeled off, it was broken by the silicone rubber layer.

Next, the uncorona-treated PP film was peeled off, the silicone rubber layer was attached to the glass plate, and then heated in a hot air circulation type oven at 80 ° C. for 30 minutes. After cooling, the silicone rubber layer was sufficiently adhered to the glass plate, and when the composite was tried to be peeled off, the silicone rubber layer could be peeled off without remaining on the glass plate.

[Comparative Example 1] In Example 1, the average unit formula:

[Chemical 9] An organopolysiloxane represented by (vinyl group content = 16% by weight), and a formula:

[Chemical 10] Example 1 except that the silatrane derivative represented by
A silicone rubber composition (III) was prepared in the same manner as.

Using this silicone rubber composition (III), a silicone rubber composite (IV) having PES films on both sides was prepared in the same manner as in Example 1.

Regarding this silicone rubber composite (IV), the corona-treated PES film could be easily peeled off from the silicone rubber layer. Similarly, the PES film not subjected to the corona treatment could be easily peeled off from the silicone rubber layer.

[Comparative Example 2] In Example 1, after applying a primer (DY39-051A / B primer manufactured by Toray Dow Corning Silicone Co., Ltd.) on one surface of the PES film instead of the corona-treated PES film. A silicone rubber composite (V) having PES films on both sides was prepared in the same manner as in Example 1 except that the PES film air-dried for 2 hours was used.

Regarding this silicone rubber composite (V), the PES film not treated with the primer could be easily peeled from the silicone rubber layer. The PES film treated with the primer adhered to the silicone rubber layer, but when this composite was bent and stretched, a part of the silicone rubber layer was peeled off.

[0046]

The silicone rubber composite of the present invention has a silicone rubber layer firmly adhered to one side of a plastic film which has been previously corona-treated or plasma-treated, and a protective film which is easily peeled off is provided on the surface of the silicone rubber layer. Since it is coated, it is easy to peel off the protective film, and there is a feature that the plastic film and the silicone rubber layer are hardly peeled off even by thermal stress or mechanical stress,
The manufacturing method of the present invention is characterized in that such a silicone rubber composite can be efficiently manufactured.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a silicone rubber composite of the present invention.

[Explanation of symbols]

1 Corona-treated or plasma-treated plastic film 2 Silicone rubber layer 3 Releasable protective film

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toyohiko Fujisawa             2-2 Chikusaigan, Ichihara-shi, Chiba Toray Dow             Corning Silicone Co., Ltd. R & D             In headquarters F-term (reference) 4F100 AJ04A AK01A AK01C AK01K                       AK03A AK52B AK52K AN02B                       AN02K BA03 BA07 BA10C                       CA30B EC18 EJ08B EJ55                       EJ55A EJ61 EJ61A GB41                       JL11 JL14C                 4J035 BA01 CA01K CA021 CA041                       CA061 CA141 CA181 HA01                       LB01 LB02

Claims (4)

[Claims] 1. A silicone rubber composite in which a silicone rubber layer is adhered to one surface of a plastic film, and the surface of the silicone rubber layer is covered with a peelable protective film, wherein the silicone rubber layer comprises: (A) an organopolysiloxane having at least two silicon-bonded alkenyl groups in one molecule, (B) an adhesion promoter, and (C) an organopolysiloxane having at least two silicon-bonded hydrogen atoms in one molecule. And (D) a silicone rubber composition comprising at least a catalyst for hydrosilylation reaction, which is cured from a silicone rubber, and the adhesive surface of the plastic film with the silicone rubber layer is previously corona-treated or plasma-treated. Characteristic silicone rubber composite. 2. The silicone rubber composite according to claim 1, wherein the plastic film is a film made of an olefin resin, a cellulosic resin, or an organic resin containing an oxygen atom or a sulfur atom in a polymer skeleton. body. 3. A silicone rubber composition is cured between a plastic film and a peelable protective film to bond a silicone rubber layer to one surface of the plastic film, and the silicone rubber layer is adhered to the surface of the silicone rubber layer. A method for producing a silicone rubber composite coating a film, wherein the silicone rubber composition comprises (A) an organopolysiloxane having at least two silicon-bonded alkenyl groups in one molecule, (B) An adhesion promoter, (C) an organopolysiloxane having at least two silicon-bonded hydrogen atoms in one molecule, and
(D) A silicone rubber composition comprising a silicone rubber composition comprising at least a catalyst for hydrosilylation reaction, wherein the adhesive surface of the plastic film with the silicone rubber layer is corona-treated or plasma-treated in advance. Production method. 4. The silicone rubber composite according to claim 3, wherein the plastic film is a film made of an olefin resin, a cellulose resin, or an organic resin containing an oxygen atom or a sulfur atom in the polymer skeleton. Body manufacturing method.