JP2003261855A - Silicone composition for forming peelable cured film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a silicone composition for forming a peelable cured film, capable of forming a flexible cured film having a low peeling resistance value and reduced in the content of migrating components by adapting this composition to the surfaces of various substrate materials such as various paper materials, laminated paper, a synthetic resin film, a metal foil or the like. <P>SOLUTION: The silicone composition for forming the peelable cured film comprises a diorganopolysiloxane (a) containing two or more alkenyl groups, each of which is bonded to a silicon atom, in one molecule thereof, an organohydrogenepolysiloxane (b) containing two or more hydrogen atoms, each of which is bonded to a silicon atom, in one molecule thereof, a platinum catalyst (c) and an organopolysiloxane resin (d) having an aryl group bonded to a silicon atom. A substrate material having a cured film of the silicon composition formed thereto is also disclosed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a silicone composition capable of forming a cured film and a substrate on which a cured film of the silicone composition is formed, and in particular, various paper materials and laminated papers. , A synthetic resin film, a silicone composition for forming a releasable cured film capable of forming a soft cured film having a small release resistance value and a low migration component when applied to the surface of various substrates such as a metal foil, and the like. The present invention relates to a substrate on which a cured film of a silicone composition is formed.

[0002]

2. Description of the Related Art It has been conventionally practiced to coat a silicone composition on various substrates such as paper, film, synthetic resin film and metal foil and cure it to obtain a flexible coating having excellent releasability. Such coatings are used in many fields, especially as a release liner for adhesive surfaces such as adhesive tapes and sheets.

As a silicone composition for forming a cured film on such a release liner, an addition type silicone composition is generally used. This addition-type silicone composition comprises a diorganopolysiloxane having a silicon atom-bonded alkenyl group as a main component, an organohydrogenpolysiloxane having a hydrogen atom bonded to a silicon atom as a crosslinking component, and a platinum-based compound. It is used as a catalyst. Addition type silicone compositions are widely used because they allow rapid crosslinking and curing reaction by controlling the temperature.

In the production or use of a pressure-sensitive adhesive tape or a pressure-sensitive adhesive sheet in which a release liner is used, the peeling speed between the pressure-sensitive adhesive surface and the release liner surface may be about 0.3 m / min at low speed and may exceed 50 m / min at high speed. It is required to have a small peel resistance value in this wide peel speed range. For example, in the production of adhesive labels, if the peeling resistance value is large, the debris will break in the debris removal process, making continuous production difficult, and if the peeling resistance value is large in the sticking process when using the label, the label itself will break. There is a problem such as being lost.

Several proposals have been made as addition type silicone compositions capable of obtaining a cured film having a low peel resistance value in a wide peel rate range. For example, a composition in which a diorganopolysiloxane having an aryl group is added to an addition-type or other curable silicone composition (JP-A-60-133051) has been proposed. In this case, although the peeling resistance value is reduced, there is a problem that the aryl group-containing polyorganosiloxane, which is a non-reactive component, exudes to the surface and the residual adhesiveness is also reduced. Further, a composition obtained by adding a diorganopolysiloxane containing an aryl group whose end is blocked with a hydroxyl group to an addition type silicone composition (Japanese Patent Laid-Open No. 9385/1993).
No. 8), an addition type composition using an alkenyl group-containing polyorganosiloxane containing a phenyl group (Japanese Patent Application Laid-Open No. Hei 2)
-187466, JP-A-7-82487)
A composition in which a reactive phenyl group-containing polyorganosiloxane is added has also been proposed. But,
Even in these cases, the peel resistance value was not yet sufficient to satisfy the requirement.

Further, in the conventionally proposed addition type silicone composition having a low peel resistance value, the surface of the cured film becomes harder as the peel resistance value decreases, so that the base material having the cured film formed thereon should be cut and processed. In some cases, fine dust of the cured film may occur. The generation of dust is suppressed by making the cured film flexible, but in this case, there was a problem of component migration from the cured film.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, that is, a peelable cured film having a small peel resistance in a wide peeling speed range is formed,
Another object of the present invention is to provide a soft silicone composition for forming a peelable cured film, which does not reduce the residual adhesion ratio of an adhesive substance adhered to the peelable cured film and has a small amount of migration components.

[0008]

Means for Solving the Problems The present inventor has made extensive studies.
As a result, a polyorganosilane specific to the addition type silicone composition is obtained.
Solving the above problems by adding roxane resin
The inventors have found that this is done and have accomplished the present invention. That is, the book
The invention provides (1) (a) the general formula R¹ _aR^Two _bSiO
_{(4-a-b) / 2}(In the formula, R¹Contains an aliphatic unsaturated group
Same or different monovalent hydrocarbon groups, R^TwoIs arche
Nyl group, a is 1 to 3, b is 0.1 to 2, and a + b is 1 to
Alke which is bonded to silicon atom in one molecule shown in 3)
Diorganopolysiloxane containing two or more nyl groups:
100 parts by weight, (b) general formula R^Three _cH_dSiO
_{(4-c-d) / 2}(In the formula, R^ThreeContains an aliphatic unsaturated group
Same or different monovalent hydrocarbon group, c is 1 to 3,
1 molecule represented by d is 0.01 to 2 and c + d is 1 to 3)
Contains two or more hydrogen atoms bonded to silicon atoms
Organohydrogenpolysiloxane: Ketone in this ingredient
Number of moles of hydrogen atom bonded to iodine atom and alkeny in component (a)
The mole ratio of the ru group is (0.5: 1) to (20: 1)
(C) Platinum-based catalyst: curing the composition of the present invention
Sufficient amount of (d) the aryl group bonded to the silicon atom
Organopolysiloxane resin (R^Four _ThreeSiO
_1/2Unit (M unit), R^Four _TwoSiO_2/2Unit (single D
Rank), R ^FourSiO_3/2Unit (T unit) and SiO
_4/2Consists of units (Q units), R^FourAre the same or different
Is a monovalent hydrocarbon group consisting of^Four0.5 to 50 mol
% Is an aryl group, and the molar ratio of M / D / T / Q units
, M / (M + D + T + Q) = 0.1-0.9, D /
(M + D + T + Q) = 0.01 to 0.9, T / (M + D
+ T + Q) = 0.01 to 0.9, Q / (M + D + T +
Q) = 0 to 0.9): 0.1 to 150 parts by weight, or
A peelable cured film-forming silicone composition comprising

(2) The organopolysiloxane resin of (d) contains R ⁴ ₃ SiO _1/2 units (M units), R ⁴ ₂
It is composed of SiO _2/2 units (D units) and R ⁴ SiO _3/2 units (T units), and the molar ratio of M / D / T units is M.
/(M+D+T)=0.1-0.9, D / (M + D +
T) = 0.05 to 0.7, T / (M + D + T) = 0.0
1 to 0.5, wherein the composition of (1)
(3) The aryl group bonded to the silicon atom of the organopolysiloxane resin of (d) is bonded only to the silicon atom of the R ⁴ SiO _3/2 unit (T unit) (1) or ( 2) The composition described in (4) (d)
The composition according to any one of (1) to (3), wherein the viscosity of the organopolysiloxane resin at 25 ° C. is 5 to 100,000 mPa, (5) the composition according to any one of (1) to (4). The present invention provides a peeling base material having a cured film formed thereon.

The present invention will be described in detail below. The component (a), the diorganopolysiloxane, used in the present invention is the main ingredient of the composition of the present invention. In order for the composition of the present invention to form a cured film having release properties after curing, the alkenyl group 2 bonded to a silicon atom in one molecule is 2
It is necessary to contain more than one. The average structural unit of the diorganopolysiloxane is represented by the formula (1) R ¹ _a R
It is represented by the _{^{2 b SiO (4-a-}} b) / 2.
In the formula, R ¹ is the same or different monovalent hydrocarbon group containing no aliphatic unsaturated group, R ² is an alkenyl group, and a is 1 to 3,
b is 0.1 to 2 and a + b is 1 to 3.

In the diorganopolysiloxane of the above formula (1), R ¹ is a substituted or unsubstituted saturated monovalent hydrocarbon group having 1 to 18 carbon atoms, specifically, a methyl group, an ethyl group or a propyl group. , Isopropyl group, butyl group, isobutyl group, tert-butyl group, pentyl group, neopentyl group, hexyl group, 2-ethylhexyl group, heptyl group,
Octyl group, nonyl group, decyl group, alkyl group such as dodecyl group, cyclopentyl group, cyclohexyl group, cycloalkyl group such as cycloheptyl group, phenyl group, tolyl group, xylyl group, biphenyl group, aryl group such as naphthyl group, Benzyl group, phenylethyl group, phenylpropyl group, aralkyl groups such as methylbenzyl group, and some or all of the hydrogen atoms in these hydrocarbon groups are halogen atoms, chloromethyl group substituted by a cyano group,
It is selected from halogen-substituted alkyl groups such as 2-bromoethyl group, 3,3,3-trifluoropropyl group, 3-chloropropyl group, and cyanoethyl group, and cyano-substituted alkyl groups. Of these, an alkyl group is preferable, and a methyl group is particularly preferable from the viewpoint of economy.

R ² is a vinyl group, an allyl group, a propenyl group, an isopropenyl group, a butenyl group, an isobutenyl group,
It is selected from alkenyl groups such as hexenyl group and cyclohexenyl group, and vinyl group is particularly preferable.

The diorganopolysiloxane (a) may be linear or branched, but a linear diorganopolysiloxane is usually used. In the formula (1), a is preferably 0.5 to 2.2, b is preferably 0.1 to 2, and a + b is preferably 1.8 to 2.2.

The diorganopolysiloxane (a) has a viscosity at 25 ° C. of 5 to 100,000 mPa · s.
It is a low viscosity liquid of s or less and has a viscosity of 5 at 25 ° C.
20,000 mPa · s is preferably used,
You may mix and use the thing of different viscosity. These diorganopolysiloxanes are prepared by methods known to those skilled in the art.

The organohydrogenpolysiloxane containing two or more hydrogen atoms bonded to silicon atoms in one molecule, which is the component (b) of the present invention, is a cross-linking component for the component (a) and has an average structural unit. Formula (2) R ³ _c H _d S
The one represented by iO _{(4-c-d) / 2} is used.
In the formula (2), R ³ is the same or different monovalent hydrocarbon group containing no aliphatic unsaturated group, c is 1 to 3 and d is 0.
01 to 2 and c + d are 1 to 3. As R ^{3 in the} formula (2), the hydrocarbon group exemplified in the above R ¹ is used, preferably an alkyl group, and more preferably a methyl group. The number of hydrogen atoms bonded to the silicon atom of the component (b) is preferably 3 or more in one molecule.

The organohydrogenpolysiloxane (b) is also preferably liquid and has a viscosity at 25 ° C. of 1 to 3000 mPa, more preferably 5 to 500 m.
Pa. The blending amount of the component (b) is such that it is blended in accordance with the amount of alkenyl in the component (a), and the number of moles of silicon atom-bonded hydrogen atoms in the component (b) and the alkenyl group in the component (a) are included. The molar ratio of (0.5: 1) to (20:
The amount is adjusted to 1). Usually, it is 0.5 to 20 parts by weight, preferably 1 to 1 per 100 parts by weight of the component (a).
0 parts by weight are used. The organohydrogenpolysiloxane (b) is also produced by a method known to those skilled in the art.

The platinum-based catalyst which is the component (c) of the present invention is
A catalyst that promotes an addition reaction between an alkenyl group and a hydrogen atom bonded to a silicon atom, and is a catalyst known to those skilled in the art. Specific examples of platinum-based catalysts include platinum group metals such as platinum, rhodium, palladium, and ruthenium, or those obtained by fixing these to a particulate carrier material (for example, activated carbon, aluminum oxide, silicon oxide), and further as a platinum compound. , Platinum halide, platinum-olefin complex, platinum-alcohol complex, platinum-alcoholate complex, platinum-vinyl siloxane complex, dicyclopentadiene-platinum dichloride, cyclooctadiene-platinum dichloride, cyclopentadiene-platinum dichloride. it can. The amount of the component (c) blended is sufficient to cure the composition of the present invention, and usually 1 to 2000 parts by weight is used per million parts by weight of both components (a) and (b). To be done.

The component (d) of the present invention is an essential component for achieving the object of the present invention, and is an organopolysiloxane resin having an aryl group bonded to a silicon atom. The organopolysiloxane resin of the present invention is R ⁴ ₃
SiO _1/2 unit (M unit), R ⁴ ₂ SiO _2/2 unit (D unit), R ⁴ SiO _3/2 unit (T unit) and Si
It is composed of O _4/2 units (Q units) and can be represented by the following formula (3). Formula (3) (R ⁴ ₃ SiO _1/2 ) _M − (R ⁴ ₂ SiO
_{^{2/2) D - (R 4 SiO}} 3/2) T - (Si
O _4/2) structural units in _Q formula (3) does not need to be bonded in a block in each unit, each unit may be bonded randomly, and a random bond and block bond It may be those that are mixed and combined. R in formula (3)
⁴ are monovalent hydrocarbon groups which are the same or different and are selected so that 0.5 to 50 mol% of all R ⁴ are aryl groups, and the molar ratio of M / D / T / Q units is , M / (M
+ D + T + Q) = 0.1 to 0.9, D / (M + D + T +
Q) = 0.01 to 0.9, T / (M + D + T + Q) =
0.01-0.9, Q / (M + D + T + Q) = 0-0.
It is 9. Preferably, M / (M + D + T + Q) = 0.
1 to 0.7, D / (M + D + T + Q) = 0.01 to 0.
7, T / (M + D + T + Q) = 0.01 to 0.7, Q /
(M + D + T + Q) = 0 to 0.5. The component (D) of the present invention comprises M, D and T components, and the molar ratio of M / D / T units is M / (M + D + T) = 0.
9, D / (M + D + T) = 0.05 to 0.7, T / (M
It is more preferable that + D + T) = 0.01 to 0.5.

R ^{4 in the} formula (3) is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 18 carbon atoms, specifically, methyl group, ethyl group, propyl group, isopropyl group, butyl group, Isobutyl group, tert-butyl group, pentyl group,
Neopentyl group, hexyl group, 2-ethylhexyl group,
Heptyl group, octyl group, nonyl group, decyl group, alkyl groups such as dodecyl group, cyclopentyl group, cyclohexyl group, cycloalkyl groups such as cycloheptyl group, vinyl group, allyl group, propenyl group, isopropenyl group, butenyl group, Alkenyl groups such as isobutenyl group, hexenyl group, cyclohexenyl group, phenyl group, tolyl group, xylyl group, biphenyl group, aryl groups such as naphthyl group, and some or all of the hydrogen atoms in these hydrocarbon groups are halogen atoms. , A chloromethyl group substituted with a cyano group, a 2-bromoethyl group, a 3,3,3-trifluoropropyl group, a 3-chloropropyl group, a halogen-substituted alkyl group such as a cyanoethyl group, or a cyano-substituted alkyl group. Be done. Preferred as R ^{4 in} formula (3) are alkyl groups and aryl groups, and among these, methyl groups and phenyl groups are preferred.

R ^{4 in the} formula (3) is 0.5 to 5 in all R ^4.
In order to achieve the object of the present invention, 0 mol% is an aryl group, preferably 1 to 30 mol%. The aryl group is contained only in the R ⁴ SiO _3/2 unit (T unit), that is, the monovalent hydrocarbon group (R ⁴ ) other than the T unit is a hydrocarbon group other than the aryl group, It is more preferred that only the monovalent hydrocarbon group (R ⁴ ) of the T unit is selected as an aryl group.

The organopolysiloxane resin (d), which is liquid at room temperature, has a high peeling resistance value in forming a cured film of the release liner of the present invention and at a wide peeling speed which is the object of the present invention. It is preferable for obtaining a small product.
Specifically, the viscosity at 25 ° C. is 5 to 100,000.
The viscosity at 25 ° C. is preferably 5 to 1,000 mPa · s. This organopolysiloxane resin can be produced by a known method, for example, by hydrolytic condensation of alkoxysilanes and tetraalkoxysilane, or hydrolysis of alkylchlorosilanes and tetrachlorosilane. The polyorganosiloxane resin obtained by these hydrolysis-condensation reactions may contain a small amount of alkoxy groups and hydroxyl groups, and organopolysiloxanes containing a small amount of these substituents are also within the scope of the present invention. Further, resins having different viscosities may be mixed.

In the present invention, the component (d) is added in an amount of 0.1 to 150 parts by weight based on 100 parts by weight of the component (a). When the amount is 0.1 parts by weight or less, the peel resistance value is not sufficiently improved, and when the amount is 150 parts by weight or more, the peel resistance value becomes unstable, which is not preferable. The preferable compounding amount of the component (d) is 1 to 120 parts by weight.

The composition of the present invention comprises the above components (a) to (d). In addition to these components, an inorganic filler such as fine powder silica, a pigment, a heat resistant additive, an organic resin. Addition of known additives as an additive of the silicone composition for forming a peelable cured film such as powder and dye,
There is no problem as long as the object of the present invention is not impaired.

The composition of the present invention can be easily prepared by simply uniformly mixing the components (a) to (d) and the additives described above. In this case, it is preferable that after the components other than the component (c) are mixed, the platinum-based catalyst of the component (c) is added and mixed before coating.

The preparation of the present composition may use an organic solvent for easy coating. It is only necessary that it is inert to the components of the composition, and for example, hydrocarbons such as toluene, xylene, hexane, heptane, and white spirit, chlorinated hydrocarbons, and the like can be used.

The composition of the present invention is applied to the surface of various base materials such as various paper materials, laminated papers, synthetic resin films and the like and cured, whereby the surface of these base materials is releasable from an adhesive substance. A film can be formed. The method of coating and curing the composition of the present invention is not particularly limited,
Normal methods can be applied.

The composition of the present invention is suitable for use as a release liner, but other than this, it is also used as a releasable paint by utilizing the adhesion to various substrates and the release performance of the cured coating film. be able to.

[0028]

EXAMPLES The present invention will now be described in detail with reference to examples, but the present invention is not limited to the following examples. The viscosity value in the examples is a value measured at 25 ° C. The peeling resistance value of the cured film of the silicone composition for forming a releasable cured film, the silicone migration property, the residual adhesion ratio (%) of the adhesive substance, and the flexibility test of the cured film were conducted according to the following methods.

(Peeling Resistance Value) A predetermined amount of the silicone composition for forming a peelable cured film was coated on the surface of paper and then heated to form a cured film. Acrylic adhesive (manufactured by Toyo Ink Co., Ltd., trade name: Olivine BPS11)
09) was applied, and this was heated and dried at 130 ° C. for 30 seconds or less. Next, attach a piece of sticky paper to this, and weigh 20 g.
/ Cm ² load, temperature 25 ℃, humidity 50-65
% Condition for 24 hours. Next, using a peeling tester (Tsukubarika Seiki Co., Ltd. high-speed peeling tester),
The laminated paper was pulled at an angle of 180 degrees at each speed of 3 m / min and 50 m / min, and the force (gf) required for peeling was measured. The sample width was 2.5 cm.

(Silicone migration) A predetermined amount of the silicone composition for forming a releasable cured film was applied to the surface of paper to form a cured film. A clean polyester film was stuck on this film, a load of 100 kg / cm ² was applied by a press, and the film was left at 25 ° C. for 30 minutes. Then, the polyester film was peeled off, a line was drawn with Magic Ink (registered trademark) on the surface where the polyester film and the cured film were in contact, and the degree of ink repellency was observed.
If there is no ink repelling, it means that there is no migration of silicone, and if there is ink repelling, it means that there is silicone migration.

(Residual Adhesion Rate) A predetermined amount of the peelable cured film-forming silicone composition was applied to the surface of paper to form a cured film. Adhesive tape (Nitto Denko Corporation) on the surface of this film
(Product name: Knit-polyester adhesive tape 31B)
Were stuck together, and a load of 20 g / cm ² was applied, and aging was performed at 70 ° C. for about 20 hours. Then, the adhesive tape was peeled off, and the peeled adhesive tape was attached to a stainless steel plate, a load of 20 g / cm ² was applied, and the mixture was left at 25 ° C. for 30 minutes, after which an angle of 180 ° and a speed of 0.3 m / min. The adhesive tape was pulled under the conditions, and the force (gf) required for peeling was measured. As a blank test, the above-mentioned adhesive tape was attached to a Teflon (registered trademark) sheet in the same manner as above,
The force (gf) required for peeling the adhesive tape was measured in the same manner as above. From these values, the residual adhesion rate (%) was calculated according to the following formula. Residual adhesion rate (%) = (force required for peeling an adhesive tape attached to a cured film of a silicone composition (gf)) / (force required for releasing an adhesive tape attached to a Teflon (registered trademark) sheet (Gf)) x 100

(Cured film flexibility test) A 100 cc beaker was charged with 20 parts of the peelable cured film-forming silicone composition.
cc was added and cured at room temperature. The surface of this cured product was pressed with a metal rod, and the degree of softness of the surface was compared with that of the cured product according to the formulation of Comparative Example 1.

Example 1 Component (a), a dimethylpolysiloxane capped with dimethylvinylsiloxy groups at both ends, having a viscosity of about 300 mPa · s 100
The phenylmethylpolysiloxane resin of the component (d) (comprising M, D, and T units, and the molar ratio of M / D / T is 0.3 / 0.5 / 0.2, relative to parts by weight). The hydrocarbon group bonded to the atom is a methyl group or a phenyl group, and 9.5 mol% of all the hydrocarbon groups is a phenyl group) and a viscosity of about 20 mPa · s. (B) 3 parts by weight of methyl hydrogen polysiloxane (viscosity about 25 mPa · s) capped with trimethylsiloxy groups at both ends of the molecular chain and 0.2 part of 1-ethynyl-1-cyclohexanol were added and stirred uniformly. . Furthermore, the platinum divinyltetramethyldisiloxane complex catalyst of component (c) was added so that the amount of platinum metal in this solution was about 100 ppm, and a silicone composition for forming a peelable cured film was prepared. The obtained silicone composition for forming a releasable cured film is applied on the surface of a polyethylene laminated high-quality paper so as to have a concentration of about 1 g / m ^2, and then this is heat-treated at 130 ° C. for 30 seconds to form a cured film. Let The peel resistance, silicone migration and residual adhesion of this cured film were measured. The results are shown in Table 1.

Example 2 Component (d) of Example 1 was prepared in the same manner as in Example 1 except that 10 parts by weight of phenylmethylpolysiloxane resin was changed to 100 parts by weight, a cured film was formed, and the characteristics were measured.
The results are shown in Table 1.

Example 3 A cured film was formed in the same manner as in Example 1 except that 10 parts by weight of the component (d) phenylmethylpolysiloxane resin of Example 1 having a viscosity of about 100 mPa · s was added. The properties were measured. The results are shown in Table 1.

Comparative Example 1 The same preparation, cured film formation and measurement as in Example 1 were carried out except that the component (d) phenylmethylpolysiloxane resin was not added in Example 1, and the results are shown in Table 1.

Comparative Example 2 The same as Example 1 except that 10 parts by weight of phenylmethyl silicone oil (viscosity of about 100 mPa · s) was added in place of 10 parts by weight of the phenylmethylpolysiloxane resin as the component (d) of Example 1. Was adjusted, the cured film was formed, and the measurement was performed. The results are shown in Table 1.

[0038]

[Table 1]

[0039]

The composition of the present invention comprises the above (a) to (d).
By including the component (d) in particular, after the curing, a peelable cured film having a small peel resistance is formed when peeled at a low speed or at a high speed after curing, and this peelable curing is performed. It is characterized in that it does not reduce the residual adhesion rate of the sticky substance that sticks to the film, and that it can form a soft peelable cured film with few migration components.

Claims (5)

[Claims] 1. (a) General formula R¹ _aR^Two _bSiO
_{(4-a-b) / 2}(In the formula, R¹Contains an aliphatic unsaturated group
Same or different monovalent hydrocarbon groups, R^TwoIs arche
Nyl group, a is 1 to 3, b is 0.1 to 2, and a + b is 1 to
Alke which is bonded to silicon atom in one molecule shown in 3)
Diorganopolysiloxane containing two or more nyl groups:
100 parts by weight, (b) general formula R^Three _cH_dSiO
_{(4-c-d) / 2}(In the formula, R^ThreeContains an aliphatic unsaturated group
Same or different monovalent hydrocarbon group, c is 1 to 3,
1 molecule represented by d is 0.01 to 2 and c + d is 1 to 3)
Contains two or more hydrogen atoms bonded to silicon atoms
Organohydrogenpolysiloxane: Ketone in this ingredient
Number of moles of hydrogen atom bonded to iodine atom and alkeny in component (a)
The mole ratio of the ru group is (0.5: 1) to (20: 1)
(C) Platinum-based catalyst: curing the composition of the present invention
Sufficient amount of (d) the aryl group bonded to the silicon atom
Organopolysiloxane resin (R^Four _ThreeSiO
_1/2Unit (M unit), R^Four _TwoSiO_2/2Unit (single D
Rank), R ^FourSiO_3/2Unit (T unit) and SiO
_4/2Consists of units (Q units), R^FourAre the same or different
Is a monovalent hydrocarbon group consisting of^Four0.5 to 50 mol
% Is an aryl group, and the molar ratio of M / D / T / Q units
, M / (M + D + T + Q) = 0.1-0.9, D /
(M + D + T + Q) = 0.01 to 0.9, T / (M + D
+ T + Q) = 0.01 to 0.9, Q / (M + D + T +
Q) = 0 to 0.9): 0.1 to 150 parts by weight, or
Silicone for forming a releasable cured film characterized by comprising
Composition. Wherein organopolysiloxane resin ^is, _R 4 3 _{SiO 1/2} units (M ^units) of _(d), R 4 2 SiO
_2/2 units (D units) and R ⁴ SiO _3/2 units (T units), and the molar ratio of M / D / T units is M / (M
+ D + T) = 0.1 to 0.9, D / (M + D + T) =
0.05-0.7, T / (M + D + T) = 0.01-
The composition of claim 1, wherein the composition comprises 0.5. 3. The organopolysiloxane resin of (d) wherein the aryl group bonded to the silicon atom is R ⁴ SiO _3/2.
The composition according to claim 1 or 2, which is bonded only to a silicon atom of a unit (T unit). 4. The viscosity of the organopolysiloxane resin (d) at 25 ° C. is 5 to 100,000 mPa · s.
The composition according to any one of claims 1 to 3, which is 5. A substrate for peeling on which a cured film of the composition according to claim 1 is formed.