JP5167399B2 - Substrate with a peelable cured film formed on the surface - Google Patents

Description

    The present invention relates to a substrate on which a peelable cured film formed by curing a silicone composition for forming a peelable cured film is formed, and more specifically, various paper materials, laminated paper, synthetic resin films, metal foils, and the like. The present invention relates to a base material on which a peelable cured film formed by curing a solvent-free peelable cured film-forming silicone composition, which can form a peelable cured film for an adhesive substance on the surface of the base material, is formed on the surface. .

  A curable silicone composition containing organopolysiloxane as a main component is used as a release liner for pressure-sensitive adhesive tapes and pressure-sensitive adhesive sheets because the cured film exhibits releasability with respect to pressure-sensitive adhesive substances. However, depending on the application, this type of composition requires not only peelability, but also smoothness between paper, between plastic films, between paper and plastic films, and between paper, plastic films, and human hands. Often done. Therefore, conventionally, many silicone compositions such as organic solvent solution type and aqueous emulsion type have been proposed as silicone compositions for forming a peelable cured film having such characteristics. However, although the former organic solvent solution type is excellent in releasability, smoothness, and curing characteristics, it requires a large amount of organic solvent, which adversely affects air pollution and the health of workers. There was a problem such as high costs. In addition, the latter aqueous emulsion type has a drawback in that it requires high temperature and long time heating to form a film, resulting in low productivity. In addition, since it is difficult to emulsify, it is difficult to use a high molecular weight organopolysiloxane, and since an emulsifier is used, the properties of the obtained cured film are inferior to those of an organic solvent solution type. there were.

On the other hand, as a silicone composition for forming a peelable cured film without using an organic solvent or water, for example, a vinyl group-containing diorganopolysiloxane having a viscosity of 50 to 4000 mPa · s at 25 ° C., at least silicon in one molecule A composition comprising an organohydrogenpolysiloxane having three hydrogen atoms bonded to an atom, a platinum-based catalyst, and an activity inhibitor has been proposed (see Japanese Patent Publication No. 52-47485). However, the cured film of this composition has a drawback in that the slipperiness is poor compared to the organic solvent solution type film as described above, and the application is thus limited. Further, a mixture of 100 to 50 parts by weight of a vinyl group-containing polysiloxane blocked with trialkylsiloxy groups at both ends of the molecular chain and 0 to 50 parts by weight of a vinyl group-containing polysiloxane blocked with dimethylvinylsiloxy groups, methyl hydrogen A solventless silicone composition comprising polysiloxane and a platinum-based catalyst is also known (see JP-A-7-258606). Although this composition has a slightly improved sliding property, it cannot be said that it is sufficient, and since the curability is low, it was not satisfactory depending on the application. For example, when this composition is used as a release agent for kraft tape, the sliding property is not sufficient, so the frictional resistance between the tape and the hand increases when the tape is applied to cardboard, etc., resulting in damage to the hand. There is also a problem that the pressure-sensitive adhesive does not adhere to the corrugated cardboard and does not adhere to the cardboard and peels over time because no force is applied to the tape crimping. In order to improve the smoothness, a method of adding dimethylsiloxane oil, polyether-modified silicone oil, surfactant, wax, etc. has been tried, but some of these additives are migrated on the surface of the cured film. As a result, the adhesive strength of the pressure-sensitive adhesive is reduced.
Japanese Patent Publication No.52-47485 JP-A-7-258606

As a result of intensive studies to solve the above-mentioned drawbacks, the present inventors have reached the present invention.
That is, the object of the present invention is excellent in curability, and after curing, it has excellent peelability and smoothness on various substrates such as paper and plastic films, and reduces the adhesive properties of adhesive substances. An object of the present invention is to provide a base material having a peelable cured film formed by curing a silicone composition for forming a peelable cured film capable of forming a cured film without any problem on the surface.

The present invention provides (A) 100 parts by weight of a mixture of 99 to 90 parts by weight of the following component (A-1) and 1 to 10 parts by weight of component (A-2).
(A-1) The viscosity at 25 ° C. is 5 to 1,000 mPa · s, both ends of the molecular chain are blocked with dimethylalkenylsiloxy groups, and the alkenyl group content is 0.2 to 10.0 mol of all organic groups. % Linear diorganopolysiloxane
(A-2) A hexenyl group having a viscosity at 25 ° C. of 1,000 to 10,000 mPa · s, both ends of the molecular chain blocked with trimethylsiloxy groups, and bonded to at least two silicon atoms in the side chain A linear diorganopolysiloxane (B) having a hexenyl group content of 0.05 to 0.5 mol% of all organic groups, a viscosity at 25 ° C. of 1 to 1,000 mPa · s, and one molecule 3 to 50 parts by weight of an organohydrogenpolysiloxane having at least 3 silicon-bonded hydrogen atoms in it,
And (C) a platinum-based catalyst comprising a catalyst amount and a surface on which a peelable cured film formed by curing a silicone composition for forming a peelable cured film characterized by substantially not containing an organic solvent is formed. Regarding materials.

で表されるジオルガノポリシロキサンが挙げられる。上式中、Ｒ¹とＲ²はアルケニル基であり、ビニル基，ブテニル基，ヘキセニル基，オクテニル基，デセニル基が例示される。これらの中でも、ビニル基またはヘキセニル基が好ましい。Ｒ³はアルケニル基以外の一価炭化水素基であり、メチル基，エチル基，ブチル基等のアルキル基；フェニル基，トリル基などのアリール基；シクロヘキシル基などのシクロアルキル基が例示される。ｘは１以上の整数であり、ｙは０以上の整数であるが、０≦ｙ／（ｘ＋ｙ）≦０.２０となる範囲であることが好ましい。（ｘ＋ｙ）は２５℃における粘度が５〜１,０００ｍＰａ・ｓとなるような値であり、好ましくは５０〜６００ｍＰａ・ｓの範囲となるような値である。このような（A-1）成分としては、両末端ジメチルビニルシロキシ基封鎖ジメチルポリシロキサン，両末端ジメチルビニルシロキシ基封鎖ジメチルシロキサン・メチルビニルシロキサン共重合体，両末端ジメチルビニルシロキシ基封鎖ジメチルシロキサン・メチルフェニルシロキサン共重合体，両末端ジメチルヘキセニルシロキシ基封鎖ジメチルポリシロキサン，両末端ジメチルヘキセニルシロキシ基封鎖ジメチルシロキサン・メチルヘキセニルシロキサン共重合体，両末端ジメチルビニルシロキシ基封鎖ジメチルシロキサン・メチルヘキセニルシロキサン共重合体が例示される。(A-1)成分としては、このようなオルガノポリシロキサンの１種を単独で使用してもよく、２種類以上の混合物を使用してもよい。 Hereinafter, the composition of the present invention will be described in detail.
The component (A-1), which is the main component of the composition of the present invention, has both molecular chain ends blocked with dimethylalkenylsiloxy groups, and the alkenyl group content is 0.2 to 10.0 mol% of the total organic groups. Linear diorganopolysiloxane. As such component (A-1), the general formula:

The diorganopolysiloxane represented by these is mentioned. In the above formula, R ¹ and R ² are alkenyl groups, and examples thereof include a vinyl group, a butenyl group, a hexenyl group, an octenyl group, and a decenyl group. Among these, a vinyl group or a hexenyl group is preferable. R ³ is a monovalent hydrocarbon group other than an alkenyl group, and examples thereof include alkyl groups such as a methyl group, an ethyl group, and a butyl group; aryl groups such as a phenyl group and a tolyl group; and cycloalkyl groups such as a cyclohexyl group. x is an integer of 1 or more, and y is an integer of 0 or more, but is preferably in the range of 0 ≦ y / (x + y) ≦ 0.20. (X + y) is a value such that the viscosity at 25 ° C. is 5 to 1,000 mPa · s, and preferably a value that is in the range of 50 to 600 mPa · s. As such (A-1) component, both ends dimethylvinylsiloxy group-blocked dimethylpolysiloxane, both ends dimethylvinylsiloxy group-blocked dimethylsiloxane / methylvinylsiloxane copolymer, both ends dimethylvinylsiloxy group-blocked dimethylsiloxane, Methylphenylsiloxane copolymer, dimethylpolysiloxane blocked with dimethylhexenylsiloxy group at both ends, dimethylsiloxane / methylhexenylsiloxane copolymer blocked with dimethylhexenylsiloxy group at both ends, dimethylsiloxane / methylhexenylsiloxane blockade with dimethylvinylsiloxy group blocked at both ends Coalescence is illustrated. As the component (A-1), one kind of such an organopolysiloxane may be used alone, or a mixture of two or more kinds may be used.

で表される両末端トリメチルシロキシ基封鎖ジメチルシロキサン・メチルヘキセニルシロキサン共重合体が挙げられる。上式中、Ｒ²はヘキセニル基である。ｗは６≧ｗ≧２を満たす正の整数であり、ｚはＲ²の含有量が全有機基の０．０５〜０．５モル％となるような数である。これは、ｗが２未満だと硬化皮膜表面に(A-2)成分の一部がブリードアウトして粘着剤の接着力が低下し、６を越えるとスベリ性が低下してしまうためである。（ｚ＋ｗ）は２５℃における粘度が１,０００〜１０,０００ｍＰａ・ｓとなるような値であり、好ましくは３,０００〜８,０００ｍＰａ・ｓとなるような値である。これは、(A-2)成分の粘度が１,０００ｍＰａ・ｓ未満だとスベリ性が発現せず、１０,０００ｍＰａ・ｓを越えると組成物の粘度が上昇して塗工性が低下するためである。 Component (A-2) is a component that imparts slipperiness to the cured film of the composition of the present invention. Both ends of the molecular chain are blocked with trimethylsiloxy groups, and the hexenyl group content is 0.05 to 0 of the total organic groups. It is a linear hexenyl group-containing diorganopolysiloxane that is 0.5 mol%. As such (A-2) component,

And a dimethylsiloxane / methylhexenylsiloxane copolymer blocked with trimethylsiloxy groups at both ends represented by the formula: In the above formula, R ² is a hexenyl group. w is a positive integer that satisfies 6 ≧ w ≧ 2, and z is a number such that the content of R ² is 0.05 to 0.5 mol% of the total organic groups. This is because when w is less than 2, a part of the component (A-2) bleeds out on the surface of the cured film and the adhesive strength of the pressure-sensitive adhesive decreases, and when it exceeds 6, the smoothness decreases. . (Z + w) is a value such that the viscosity at 25 ° C. is 1,000 to 10,000 mPa · s, and preferably 3,000 to 8,000 mPa · s. This is because, when the viscosity of the component (A-2) is less than 1,000 mPa · s, the smoothness is not expressed, and when it exceeds 10,000 mPa · s, the viscosity of the composition increases and the coatability decreases. It is.

  Component (A) is a mixture of 99 to 90 parts by weight of component (A-1) and 1 to 10 parts by weight of component (A-2), and 94 to 98 parts by weight of component (A-1) and (A- 2) It is preferable to mix 6 to 2 parts by weight of the component.

  The (B) component organohydrogenpolysiloxane is a component that acts as a crosslinking agent. This organohydrogenpolysiloxane has at least three silicon-bonded hydrogen atoms in one molecule, and the bonding position is not particularly limited. Examples of organic groups bonded to silicon atoms other than hydrogen atoms include alkyl groups such as methyl, ethyl, propyl, butyl, pentyl, and hexyl groups; aryl groups such as phenyl, tolyl, and xylyl groups; benzyl And monovalent hydrocarbon groups that do not contain an aliphatic unsaturated bond such as an aralkyl group such as a phenethyl group or a phenethyl group. The viscosity of this component at 25 ° C. is 1 to 1,000 mPa · s. The compounding amount of this component is in the range of 3 to 50 parts by weight with respect to 100 parts by weight of component (A). This is because if the amount of this component is less than 3 parts by weight, the composition of the present invention will be insufficiently cured, and if it exceeds 50 parts by weight, the peel resistance value of the cured film will change over time. is there.

  The platinum-based catalyst of component (C) is a catalyst for accelerating the curing of the composition of the present invention. Platinum such as platinum black, platinum-supported silica, platinum-supported activated carbon, etc., chloroplatinic acid, chloroplatinic acid alcohol solution, Examples thereof include platinum compounds such as a complex of chloroplatinic acid and an olefin, and a complex of chloroplatinic acid and an alkenylsiloxane. The compounding amount of this component may be a catalytic amount, and is preferably such that the amount of platinum metal is 1 to 1,000 ppm with respect to the total amount of component (A) and component (B).

  The composition of the present invention comprises the above components (A) to (C), but in addition to these components, 3-methyl-1-butyn-3-ol, 1-ethynyl-1-cyclohexanol Known as additives for silicone compositions for forming peelable cured films such as curing retarders such as, phenylbutynol and benzotriazole, inorganic fillers such as fine powdered silica, pigments, heat resistant additives, organic resin powders and dyes Addition and blending of the components may be carried out as long as the object of the present invention is not impaired. As for the compounding quantity of a hardening retarder, 0.01-2.0 weight part is preferable with respect to 100 weight part of total amounts of (A) component and (B) component. The viscosity at 25 ° C. of the composition of the present invention is preferably in the range of 50 to 1,000 mPa · s from the viewpoint of coating properties, and can be applied without using an organic solvent within this viscosity range. it can.

  The composition of the present invention can be easily produced by uniformly mixing the components (A) to (C). In this case, after mixing (A) component and (B) component, it is preferable to add and mix (C) component or (C) component and a curing retarder.

  The composition of the present invention as described above is applied to the surface of various base materials such as various paper materials, laminated paper, and synthetic resin film and cured to peel off the adhesive material on the surface of these base materials. In addition, this cured film has a feature that it is excellent in slipperiness and does not deteriorate the adhesive property of the adhesive substance. In addition, since the composition of the present invention does not substantially contain an organic solvent, it has an advantage that it is preferable from the viewpoints of environmental protection and work environment improvement. Moreover, this invention composition has the advantage that the peeling resistance value in low speed from high speed can be controlled by changing the compounding ratio of the said (A) component and (B) component. From these facts, the composition of the present invention is particularly useful as a release agent for kraft tape. In addition to the release liner, it can be used as a peelable paint.

○残留接着率
剥離性硬化皮膜形成用シリコーン組成物を紙の表面に所定量塗工して硬化皮膜を形成させた。この皮膜表面に、粘着テープ［日東電工（株）製，商品名：ニットーポリエステル粘着テープ３１Ｂ］を貼合わせ、１９６．２mN/cm²の荷重をかけて７０℃で２０時間エージングした。次いで粘着テープをはがしてステンレス板に貼付け、１９６．２mN/cm²の荷重をかけて２５℃で３０分間放置した後、角度１８０度，速度０.３m/分の条件で粘着テープを引張り、剥離に要した力(mN)を測定した。また、ブランク試験として、テフロン（登録商標）シートに上記の粘着テ−プを上記と同様に貼合わせて、この粘着テープの剥離に要した力(mN)を上記と同様に測定した。これらの値から、次式に従って残留接着率（％）を算出した。

○シリコーン移行性
剥離性硬化皮膜形成用シリコーン組成物を紙の表面に所定量塗工し硬化させて剥離紙を作成した。この剥離紙表面に、清浄なポリエステルフィルムを貼合わせ、プレスで９８１N/cm²の荷重をかけて、２５℃で３０分間放置した。次いで、ポリエステルフィルムをはがし取り、そのポリエステルフィルムの剥離紙と接触していた面にマジックインキ（登録商標）で線を書き、インキのはじきの程度を測定した。インキのはじきがなければシリコーン移行がないものとし、インキのはじきがあればシリコーン移行があるものとした。 Next, the present invention will be described in detail with reference to examples. In addition, the value of the viscosity in an Example is the value measured in 25 degreeC. Moreover, the measurement of the peeling resistance value of a cured film of the silicone composition for peelable cured film formation, a dynamic friction coefficient, silicone transferability, and the residual adhesive rate (%) of an adhesive substance was performed in accordance with the following method.
○ Peeling resistance value A predetermined amount of the silicone composition for forming a peelable cured film was applied to the surface of paper to form a cured film. An acrylic pressure-sensitive adhesive [manufactured by Toyo Ink Co., Ltd., trade name: Olivevine BPS5127] was applied to the surface of the film, and this was heat-dried at a temperature of 70 ° C. for 2 minutes. Next, a laminated paper was laminated on this, and a load of 196.2 mN / cm ² was applied, and the mixture was allowed to stand for 24 hours under conditions of a temperature of 25 ° C. and a humidity of 60%. Next, using Tensilon and a high-speed peeling tester, the laminated paper was pulled at an angle of 180 degrees at each speed of 0.3 m / min and 100 m / min, and the force (mN) required for peeling was measured. All the sample widths were 2.5 cm.
Coefficient of dynamic friction A predetermined amount of the silicone composition for forming a peelable cured film was applied to the surface of the paper and cured to prepare a release paper. The release paper was fixed on the sample stage of a high-speed peel tester with the release surface facing up. Also, the release paper prepared in the same manner was wrapped around a 5 cm × 5 cm × 1 cm sample holder with the release paper surface facing outward, and fixed, and a load of 1.962 N was applied on the release paper surface on the sample table. I put it over. Using a high speed peel tester, the sample holder was pulled at a speed of 10 m / min, and the resistance (N) required at this time was measured. The dynamic friction coefficient was calculated from the resistance value according to the following formula. The smaller this value, the better the slipperiness.

Residual adhesion rate A predetermined amount of the peelable cured film-forming silicone composition was applied to the paper surface to form a cured film. An adhesive tape [manufactured by Nitto Denko Corporation, trade name: Knit-Polyester Adhesive Tape 31B] was bonded to the surface of this film, and aged at 70 ° C. for 20 hours under a load of 196.2 mN / cm ² . Next, the adhesive tape is peeled off and applied to the stainless steel plate. After being left at 25 ° C for 30 minutes under a load of 196.2 mN / cm ² , the adhesive tape is pulled and peeled off at an angle of 180 degrees and a speed of 0.3 m / min. The force (mN) required for the measurement was measured. Further, as a blank test, the above-mentioned adhesive tape was bonded to a Teflon (registered trademark) sheet in the same manner as described above, and the force (mN) required for peeling off the adhesive tape was measured in the same manner as described above. From these values, the residual adhesion rate (%) was calculated according to the following formula.

○ Silicone transfer property A predetermined amount of the silicone composition for forming a peelable cured film was applied to the surface of the paper and cured to prepare a release paper. A clean polyester film was bonded to the surface of the release paper, and a load of 981 N / cm ² was applied with a press and left at 25 ° C. for 30 minutes. Next, the polyester film was peeled off, and a line was written with Magic Ink (registered trademark) on the surface of the polyester film that was in contact with the release paper, and the degree of ink repelling was measured. If there was no ink repelling, there was no silicone transfer, and if there was ink repelling, there was silicone transfer.

[Example 1]
A dimethylvinylsiloxy group-blocked dimethylsiloxane / methylvinylsiloxane copolymer (98 mol% dimethylsiloxane unit, 2 mol% methylvinylsiloxane unit) having a viscosity of 10,000 mPa · s and a molecular chain at both ends, and a viscosity of 60 mPa · s. 67.2 parts by weight of dimethylvinylsiloxy-blocked polydimethylsiloxane blocked at both ends of the molecular chain was mixed to obtain a vinyl group-containing diorganopolysiloxane mixture (vinyl group content 3.1 mol%) having a viscosity of 250 mPa · s. . Next, a dimethylsiloxane / methylhexenylsiloxane copolymer blocked with trimethylsiloxy groups at both ends of the molecular chain having a viscosity of 7,000 mPa · s (dimethylsiloxane unit 99.6 mol%, methylhexenylsiloxane unit 0.4 mol%) 3. 5 parts by weight, 9 parts by weight of methyl hydrogen polysiloxane blocked with trimethylsiloxy group-blocked methylhydrogenpolysiloxane having a viscosity of 20 mPa · s and 0.3 parts by weight of 1-ethynyl-1-cyclohexanol were added and mixed uniformly. Further, a silicone composition for forming a peelable cured film having a viscosity of 270 mPa · s is prepared by adding a complex salt of chloroplatinic acid and 1,3-divinyltetramethyldisiloxane so that the amount of platinum metal becomes 100 ppm. A product was prepared.
The obtained silicone composition for forming a peelable cured film was applied to the surface of polyethylene laminate fine paper in an amount of about 1.0 g / m ² and then heated at 150 ° C. for 30 seconds. The cured film was formed by processing. The peel resistance, dynamic friction coefficient, silicone transferability and residual adhesion rate of this cured film were measured. These results are shown in Table 1.

[Comparative Example 1]
In Example 1, a dimethylsiloxane / methylhexenylsiloxane copolymer blocked with a trimethylsiloxy group at both ends of a molecular chain having a viscosity of 7,000 mPa · s (dimethylsiloxane unit 99.6 mol%, methylhexenylsiloxane unit 0.4 mol%) Instead, a silicone composition for forming a peelable cured film was prepared in the same manner as in Example 1 except that a polydimethylsiloxane blocked with a trimethylsiloxy group blocked at both ends of a molecular chain having a viscosity of 7000 mPa · s was blended.
The obtained silicone composition for forming a peelable cured film was applied to the surface of a polyethylene laminate fine paper in an amount of about 1.0 g / m ² and then heated at 130 ° C. for 20 seconds. The cured film was formed by processing. The peel resistance, dynamic friction coefficient, silicone transferability and residual adhesion rate of this cured film were measured. These results are shown in Table 1.

[Comparative Example 2]
In Example 1, a dimethylsiloxane / methylhexenylsiloxane copolymer blocked with a trimethylsiloxy group at both ends of a molecular chain having a viscosity of 7,000 mPa · s (dimethylsiloxane unit 99.6 mol%, methylhexenylsiloxane unit 0.4 mol%) Instead of the examples, except that a dimethylsiloxane / methylhexenylsiloxane copolymer having a viscosity of 7,000 mPa · s and having both ends of a molecular chain blocked with a trimethylsiloxy group was blocked (dimethylsiloxane unit 98 mol%, methylhexenylsiloxane unit 2 mol%) In the same manner as in Example 1, a silicone composition for forming a peelable cured film was prepared.
The obtained silicone composition for forming a peelable cured film was applied to the surface of a polyethylene laminate fine paper in an amount of about 1.0 g / m ² and then heated at 130 ° C. for 20 seconds. The cured film was formed by processing. The peel resistance, dynamic friction coefficient, silicone transferability and residual adhesion rate of this cured film were measured. These results are shown in Table 1.

[Comparative Example 3]
In Example 1, a dimethylsiloxane / methylhexenylsiloxane copolymer blocked with a trimethylsiloxy group blocked at both ends of a molecular chain having a viscosity of 7,000 mPa · s (dimethylsiloxane unit 99.6 mol%, methylhexenylsiloxane unit 0.4 mol%) Instead of blending a dimethylvinylsiloxy group-blocked dimethylsiloxane / methylvinylsiloxane copolymer with a viscosity of 500 mPa · s (dimethylsiloxane unit 99.5 mol%, methylvinylsiloxane unit 0.5 mol%) Prepared a peelable cured film-forming silicone composition in the same manner as in Example 1.
The obtained silicone composition for forming a peelable cured film was applied to the surface of a polyethylene laminate fine paper in an amount of about 1.0 g / m ² and then heated at 130 ° C. for 20 seconds. The cured film was formed by processing. The peel resistance, dynamic friction coefficient, silicone transferability and residual adhesion rate of this cured film were measured. These results are shown in Table 1.

[Example 2]
A dimethylvinylsiloxy group-blocked dimethylsiloxane / methylvinylsiloxane copolymer (96 mol% dimethylsiloxane unit, 4 mol% methylvinylsiloxane unit) having a viscosity of 400 mPa · s was added to 83.7 parts by weight of a 4,000 mPa viscosity. Dimethylsiloxane / methylhexenylsiloxane copolymer (99.6 mol% dimethylsiloxane unit, 0.4 mol% methylhexenylsiloxane unit) capped with trimethylsiloxy groups at both ends of the molecular chain of s 7.0 parts by weight, viscosity 20 mPa · s 9 parts by weight of methylhydrogenpolysiloxane blocked with trimethylsiloxy groups at both ends of the molecular chain and 0.3 part by weight of 1-ethynyl-1-cyclohexanol were added and mixed uniformly. Subsequently, a complex salt of chloroplatinic acid and 1,3-divinyltetramethyldisiloxane is added and blended in such an amount that the amount of platinum metal becomes 100 ppm, and a silicone composition for forming a peelable cured film having a viscosity of 400 mPa · s. Was prepared.
The obtained silicone composition for forming a peelable cured film was applied to the surface of a polyethylene laminate fine paper in an amount of about 1.0 g / m ² and then heated at 130 ° C. for 20 seconds. The cured film was formed by processing. The peel resistance, dynamic friction coefficient, silicone transferability and residual adhesion rate of this cured film were measured. These results are shown in Table 1.

[Example 3]
In Example 2, a dimethylsiloxane / methylhexenylsiloxane copolymer blocked with a trimethylsiloxy group blocked at both ends of a molecular chain having a viscosity of 4,000 mPa · s (99.6 mol% of dimethylsiloxane units, 0.4 mol% of methylhexenylsiloxane units). Instead, a dimethylsiloxane / methylhexenylsiloxane copolymer having a viscosity of 8,000 mPa · s and having both ends of a molecular chain blocked with a trimethylsiloxy group was blocked (dimethylsiloxane unit 99.8 mol%, methylhexenylsiloxane unit 0.2 mol%). Except for this, a silicone composition for forming a peelable cured film having a viscosity of 500 mPa · s was prepared in the same manner as in Example 2.
The obtained silicone composition for forming a peelable cured film was applied to the surface of a polyethylene laminate fine paper in an amount of about 1.0 g / m ² and then heated at 130 ° C. for 20 seconds. The cured film was formed by processing. The peel resistance, dynamic friction coefficient, silicone transferability and residual adhesion rate of this cured film were measured. These results are shown in Table 1.

[Comparative Example 4]
A dimethylvinylsiloxy group-blocked dimethylsiloxane / methylvinylsiloxane copolymer (96 mol% of dimethylsiloxane units, 4 mol% of methylvinylsiloxane units) with a viscosity of 400 mPa · s and a dimethylvinylsiloxy group-capped dimethylvinylsiloxy group is used. 9 parts by weight of methylhydrogenpolysiloxane blocked with trimethylsiloxy groups at both ends of the molecular chain and 0.3 part by weight of 1-ethynyl-1-cyclohexanol were added and mixed uniformly. Next, a complex composition of chloroplatinic acid and 1,3-divinyltetramethyldisiloxane was added and blended in such an amount that the amount of platinum metal was 100 ppm to prepare a silicone composition for forming a peelable cured film.
The obtained silicone composition for forming a peelable cured film was applied to the surface of a polyethylene laminate fine paper in an amount of about 1.0 g / m ² and then heated at 130 ° C. for 20 seconds. The cured film was formed by processing. The peel resistance, dynamic friction coefficient, silicone transferability and residual adhesion rate of this cured film were measured. These results are shown in Table 1.

[Effect of the invention]
The composition of the present invention comprises the above components (A) to (C), and in particular, since a mixture of the components (A-1) and (A-2) is used as the component (A), after curing, It has a feature that it forms a film excellent in peelability and slipperiness and does not lower the residual adhesion rate of the adhesive substance adhered to the peelable cured film.

Claims (1)

(A) 100 parts by weight of a mixture of 99 to 90 parts by weight of the following component (A-1) and 1 to 10 parts by weight of component (A-2)
(A-1) The viscosity at 25 ° C. is 5 to 1,000 mPa · s, both ends of the molecular chain are blocked with dimethylalkenylsiloxy groups, and the alkenyl group content is 0.2 to 10.0 mol of all organic groups. % Linear diorganopolysiloxane
(A-2) A hexenyl group having a viscosity at 25 ° C. of 1,000 to 10,000 mPa · s, both ends of the molecular chain blocked with trimethylsiloxy groups, and bonded to at least two silicon atoms in the side chain A linear diorganopolysiloxane (B) having a hexenyl group content of 0.05 to 0.5 mol% of all organic groups, a viscosity at 25 ° C. of 1 to 1,000 mPa · s, and one molecule 3 to 50 parts by weight of an organohydrogenpolysiloxane having at least 3 silicon-bonded hydrogen atoms in it,
And (C) a platinum-based catalyst comprising a catalyst amount and a surface on which a peelable cured film formed by curing a silicone composition for forming a peelable cured film characterized by substantially not containing an organic solvent is formed. Wood.