JP6563146B1 - Peelable silicone resin composition and release film coated with the same - Google Patents

Abstract

The present invention provides a peelable silicone resin composition having good adhesion to an easy-adhesion treated film and an untreated polyester film, and a peelable silicone resin composition that does not cause adhesive residue on a glass surface. An applied release film is provided. A polyorganosiloxane (A) having a vinyl group bonded to a silicon atom other than a terminal and having a weight average molecular weight of 300 to 1,000,000, and having a vinyl group at both ends and a weight average molecular weight of 1 to 100,000. A polyorganosiloxane (B), a polyorganohydrogensiloxane (C) having a hydrogen atom directly bonded to a silicon atom other than the terminal, a curing catalyst (D), a reactive functional group-containing hydrolyzable silane compound (E ) And an aluminum chelate compound (F), and a peelable silicone resin composition, and a release film coated with the same. [Selection figure] None

Description

  The present invention relates to a peelable silicone resin composition having good adhesion to an easy-adhesion-treated film or an untreated polyester film that has not been subjected to an easy-adhesion treatment. When the silicone film side of the release film formed by applying an easy-adhesive layer or an untreated polyester film that has not been subjected to an easy-adhesion treatment to form a silicone layer is adhered to glass and peeled off with the release film after a long period of time, The present invention relates to a releasable silicone resin composition in which an increase in adhesive strength with time is small and so-called adhesive residue does not occur on a glass surface, and a release film coated with the same.

  Conventionally, as a fixed sheet that can be easily re-applied and can be peeled off with a slight peel force at the time of re-peeling and no adhesive residue is generated, it is easy to use in a fixed sheet in which an easy-adhesive layer and a silicone layer are laminated on at least one side. The adhesive layer is made of a polyester resin having a hydroxyl value of 10 to 45 or an acrylic resin having a hydroxyl value of 10 to 45, and the silicone layer is made of a linear polyorganosiloxane having vinyl groups only at both ends. , A silicone composed of a linear polyorganosiloxane having vinyl groups at both ends and side chains, a silicone composed of a branched polyorganosiloxane having vinyl groups only at the ends, and a branched structure having vinyl groups at the ends and side chains Organohydro at least one silicone selected from silicones made of polyorganosiloxane Will be crosslinked by E down polysiloxane stationary sheet characterized by containing a silicone oil to the silicone layer has been proposed (Patent Document 1).

  However, when the fixing sheet is adhered to the glass, the silicone oil moves to the interface with the glass and inhibits the reaction between SiH groups that did not contribute to the addition reaction of silicone and OH groups on the glass surface, thereby fixing the fixing sheet. Prevents adhesive residue when the sheet is peeled again, so unreacted organohydrogenpolysiloxane and silicone oil may remain on the glass surface when the fixed sheet is peeled again, which may contaminate the glass surface. There is a problem.

  In the fixing sheet, the polyester resin or acrylic resin forming the easy adhesion layer has a high hydroxyl value of 10 to 45, and the polyester resin or acrylic resin having a hydroxyl value of less than 10 is: Since the adhesive force between the easy-adhesion layer and the silicone layer formed thereby becomes weak, there is a problem that it is difficult to use for the formation of the easy-adhesion layer. When the easy-adhesion layer is formed thereon, there is a problem that the silicone layer described in Patent Document 1 cannot be applied.

On the other hand, a peelable silicone resin composition that solves these problems and a release film coated with the same are coated with a polyester resin having a hydroxyl value of 3 to 45 mgKOH / g on at least one surface of the base film to form an easy adhesion layer. A peelable silicone resin composition to be applied to the easy-adhesion layer of the obtained easy-adhesion treatment film, which has vinyl groups at both ends and a weight average molecular weight of 300 to 1,000,000, and is a linear or branched poly An organosiloxane (A), a vinyl group at both ends, a weight average molecular weight of 1 to 100,000, linear or branched polyorganosiloxane (B), and an OH group content of less than 1% by weight consists formula SiO _1/2 units and SiO _4/2 units, the molar ratio of SiO _1/2 units and SiO _4/2 units is 0.5: 1.0 to 0.8: silicone Les consisting 1.0 (C), a polyorganohydrogensiloxane (D) having a viscosity of 10 to 100 cSt / 25 ° C. and having a hydrogen atom directly bonded to a silicon atom in the side chain, and a curing catalyst (E) required for the addition reaction A releasable silicone resin composition comprising a reactive functional group-containing hydrolyzable silane compound (F) and an aluminum chelate compound (G), and a silicone layer formed by applying this composition A release film has been proposed (Patent Document 2).

Japanese Patent No. 4505649 Japanese Patent Laid-Open No. 2006-98286

  However, the releasable silicone resin composition described in Patent Document 2 and the release film coated with the same may have good adhesion to a film having an easy-adhesion layer having a hydroxyl value of less than 10 mg. In addition, there is a problem that the adhesiveness may become insufficient with time for an untreated polyester film that has not been subjected to easy adhesion treatment, and the absolute value of the peel strength indicating the adhesion to glass increases with time. The release silicone resin composition having sufficient peelability and tackiness for an untreated polyester film that has not been subjected to easy adhesion treatment due to the two issues, and the There was a problem that it was difficult to say that the film was a peeled film.

  The problem to be solved by the present invention is a releasable silicone resin composition having good adhesion to the easy-adhesion layer even when the hydroxyl value of the easy-adhesion layer formed on the easy-adhesion-treated film is less than 10. In addition, there is no inadequate adhesion over time even for untreated polyester film that has not been subjected to easy adhesion treatment, and the absolute value of the peel strength that shows adhesiveness to glass increases over time. The release film has sufficient peelability over a long period of time, and further, from these, a release film in which the peelable silicone composition of the present invention is applied to an untreated polyester film that has not been subjected to an easy adhesion treatment. However, it has sufficient releasability and adhesiveness, and in addition, there is no adhesive residue on the glass surface and the releasable silicone that does not contaminate the glass surface. And to provide a release film which fat composition and the same is applied.

In order to solve the above-mentioned problems, the invention according to claim 1 is directed to an easy-adhesion treatment film in which an easy-adhesion layer is formed by applying a polyester resin having a hydroxyl value of 3 to 45 mgKOH / g to at least one surface of a base film. A releasable silicone resin composition that is applied to the easy-adhesion layer or applied to the surface where the base film is a polyester film and the easy-adhesion layer is not formed,
A linear or branched polyorganosiloxane (A) having a vinyl group bonded to a silicon atom other than the terminal and having a weight average molecular weight of 300 to 1,000,000,
Linear or branched polyorganosiloxane (B) having vinyl groups at both ends and having a weight average molecular weight of 1 to 100,000,
A polyorganohydrogensiloxane (C) having a hydrogen atom directly bonded to a silicon atom other than the terminal;
A curing catalyst (D) required for the addition reaction;
A reactive functional group-containing hydrolyzable silane compound (E);
An aluminum chelate compound (F);
There is provided a peelable silicone resin composition comprising:

The invention according to claim 2 further comprises an OH group content of 0.1 to 5.0% by weight, comprising a general formula SiO _1/2 unit and SiO _4/2 unit, and includes SiO _1/2 unit / SiO 2. _2. The peelable silicone resin composition according to claim 1, comprising a polyorganosiloxane (G) having a molar ratio of _4/2 units of 0.5 to 1.0.

  The invention according to claim 3 is characterized in that the reactive functional group-containing hydrolyzable silane compound (E) is 3-glycidoxypropyltrimethoxysilane. A peelable silicone resin composition is provided.

  The invention according to claim 4 is the peelable silicone resin composition according to any one of claims 1 to 3, wherein the aluminum chelate compound (F) is aluminum trisethyl acetoacetate. provide.

  In the invention according to claim 5, the reactive functional group-containing hydrolyzable silane compound (E) is a total of polyorganosiloxane (A), polyorganosiloxane (B) and polyorganohydrogensiloxane (C). The peelable silicone resin composition according to any one of claims 1 to 4, comprising 0.8 to 3.5 parts by weight with respect to 100 parts by weight of the blending part.

  Further, in the invention according to claim 6, the aluminum chelate compound (F) is used in an amount of 100 parts by weight of the total blending part of the polyorganosiloxane (A), the polyorganosiloxane (B) and the polyorganohydrogensiloxane (C). The peelable silicone resin composition according to any one of claims 1 to 5, characterized by comprising 0.08 to 0.35 parts by weight.

  In addition, the invention according to claim 7 is the above easy-adhesion layer of the easy-adhesion treatment film formed by applying a polyester-based resin having a hydroxyl value of 3 to 45 mg KOH / g to at least one surface of the base film, Alternatively, a silicone layer is formed by applying the peelable silicone resin composition according to any one of claims 1 to 6 on a surface on which a base film is a polyester film and an easy adhesion layer is not formed. A release film is provided.

  The peelable silicone resin composition of the present invention has good adhesion even when the easy-adhesion layer provided on at least one surface of the easy-adhesion-treated film is formed of a polyester-based resin having a hydroxyl value of less than 10. There is an effect. In addition, there is an effect that the adhesion does not become insufficient with time even with respect to an untreated polyester film that has not been subjected to easy adhesion treatment, and the absolute value of the peel strength showing the adhesiveness to glass increases with time. There is an effect of having sufficient releasability over a long period of time because the degree to which it is small, and particularly the release of the peelable silicone resin composition of the present invention applied to an untreated polyester film that has not been subjected to an easy adhesion treatment. Even if it is an adhesive film, there exists an effect which has sufficient peelability and adhesiveness.

  Furthermore, with the peelable silicone resin composition of the present invention, the silicone layer side of the release film in which the silicone layer is formed on the easy-adhesion treated film or the untreated polyester film is adhered to the glass and then peeled off after a long time has passed. Even if the film is peeled off from the glass, there is an effect that no adhesive residue is generated on the glass surface. In addition, there is an effect that the glass surface is not contaminated because a silicone oil that is easily transferred is not used.

  In particular, in the release film according to claim 7, the easy-adhesion layer formed on the base film is formed of a polyester resin having a hydroxyl value of 10 mg / KOH or less, or the base film is a polyester film. Even if it is an untreated polyester film on which an easy adhesion layer is not formed, the adhesive property between the silicone layer and the base film is sufficient, and there is an effect that it does not easily peel off. In order to peel off the release film from the glass after allowing it to adhere to the glass and further elapse for a long time, it has sufficient adhesiveness and peelability, and there is an effect that no adhesive residue occurs on the glass surface, Furthermore, there is an effect that the glass surface is not contaminated.

  Hereinafter, the peelable silicone resin composition according to the present invention will be specifically described.

<Polyorganosiloxane (A)>
The polyorganosiloxane (A) used in the present invention is a linear or branched polyorganosiloxane having a vinyl group bonded to a silicon atom other than the terminal and having a weight average molecular weight of 300 to 1,000,000. And used together with the polyorganosiloxane (B) shown in FIG. In particular, polyorganosiloxane (A) has a large molecular weight and is used for developing viscoelastic adhesiveness to the easy adhesion layer formed on the easy adhesion treatment film or the untreated polyester film surface. Further, the polyorganosiloxane (A) is cured by an addition reaction with the following organohydrogensiloxane (C) and a curing catalyst (D), and the organic group bonded to the silicon atom other than the vinyl group may be different or the same. Specific examples include a methyl group, an ethyl group, a phenyl group, and the like. As a specific example, a vinyl group is bonded to some silicon atoms other than the terminal of polydimethylsiloxane (methyl bonded to a silicon atom other than the terminal). And a group in which a part of the group is substituted with a vinyl group). The weight average molecular weight of the polyorganosiloxane is preferably 300 to 1,000,000 as measured by GPC. If it is less than 300,000, the viscosity of the composition becomes too low, and if it exceeds 1,000,000, the viscosity of the composition becomes high. It becomes insufficient. The vinyl group may be contained in an amount of 0.01% by weight or more, and preferably 5.0% by weight or less.

<Polyorganosiloxane (B)>
The polyorganosiloxane (B) used in the present invention is a linear or branched polyorganosiloxane having vinyl groups at both ends and having a weight average molecular weight of 1 to 100,000. Used in conjunction with A). In particular, since polyorganosiloxane (B) has a low molecular weight, it is used to develop tackiness with respect to the easy adhesion layer formed on the easy adhesion treatment film. Further, like the polyorganosiloxane (A), the polyorganosiloxane (B) is cured by an addition reaction with the organohydrogensiloxane (C) and the curing catalyst (E) shown below, and becomes a silicon atom other than the vinyl group. The organic groups to be bonded may be different or the same. Specific examples include a methyl group, an ethyl group, and a phenyl group, and specific examples include polydimethylsiloxane having both terminal vinyl groups. The weight average molecular weight of the polyorganosiloxane is preferably 1 to 100,000 as measured by GPC, and if it is less than 10,000, the crosslinking density becomes high and the adhesion to a substrate such as glass becomes insufficient, and if it exceeds 100,000, the composition Viscosity increases and coatability becomes insufficient.

<Polyorganohydrogensiloxane (C)>
The polyorganohydrogensiloxane (C) used in the present invention is a polyorganohydrogensiloxane having hydrogen atoms directly bonded to silicon atoms other than the terminals, and the viscosity is preferably 10 to 100 cSt / 25 ° C. The polyorganohydrogensiloxane (C) is crosslinked and cured by an addition reaction with the polyorganosiloxane (A) and polyorganosiloxane (B) and the curing catalyst (E). The silicon atom to which the hydrogen atom is directly bonded is preferably other than the end in order to develop adhesiveness. If the hydrogen atom is bonded to the silicon atom at the end, the hardness of the cured product is increased and the peelability is improved. It becomes insufficient. If the viscosity is less than 10 cSt / 25 ° C., the crosslinking density is lowered and the curability is lowered, and if it exceeds 100 cSt / 25 ° C., the crosslinking density is increased and the adhesion to the base film is lowered.

  Further, the content of hydrogen atoms bonded to silicon atoms is preferably 1.0 mmol / g to 20.0 mmol / g, and if it is 1.0 mmol / g or more, curability is improved. When the content of hydrogen atoms exceeds 20.0 mmol / g, the tack of the cured product surface becomes too strong. In order to obtain good adhesion to the polyester film, the hydrogen atom content is more preferably 1.5 mmol / g or more. Examples of the organo group bonded to the silicon atom include a methyl group, an ethyl group, and a phenyl group. The polyorganohydrogensiloxane may be, for example, linear or branched, and specific examples include methylphenyl hydrogen polysiloxane.

<Curing catalyst (D)>
The curing catalyst (D) used in the present invention is used for causing an addition reaction between the polyorganosiloxane (A) and the polyorganosiloxane (B) and the polyorganohydrogensiloxane (C). Known metals, metal compounds, metal complexes and the like having catalytic activity for hydrosilylation reaction can be used. In particular, it is preferable to use platinum, a platinum compound, or a complex thereof. These catalysts may be used alone or in combination of two or more. A cocatalyst may be used in combination. The blending amount of the curing catalyst (D) is preferably 1 ppm to 50 ppm, more preferably 5 to 20 ppm with respect to the entire composition. If it is less than 1 ppm, the curability is lowered, and if it exceeds 50 ppm, the transparency of the cured product is lowered.

<Reactive functional group-containing hydrolyzable silane compound (E)>
The reactive functional group-containing hydrolyzable silane compound (E) used in the present invention is used for improving the adhesion over time to an easy-adhesion layer formed on an easy-adhesion-treated film or an untreated polyester film. For example, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2- (3,4 -Epoxycyclohexyl) ethyltrimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltriethoxysilane, and the like can be used. The compounding amount of the reactive functional group-containing hydrolyzable silane compound (E) is 100 parts by weight in total of the polyorganosiloxane (A), polyorganosiloxane (B) and polyorganohydrogensiloxane (C). On the other hand, 0.8 to 3.5 parts by weight is preferable. If it is less than 0.8 parts by weight, the adhesiveness over time becomes insufficient, and if it exceeds 3.5 parts by weight, the adhesiveness to the glass increases with time. The peelability is poor.

<Aluminum chelate compound (F)>
The aluminum chelate compound (F) used in the present invention acts as a condensation catalyst for the hydrolyzable group of the above-mentioned reactive functional group-containing hydrolyzable silane compound. Used to prevent a drop. Specific examples include ethyl acetoacetate aluminum diisopropylate, ethyl acetoacetate aluminum dibutyrate, diethyl acetoacetate aluminum butyrate, aluminum trisethyl acetoacetate, alkyl acetoacetate aluminum diisopropylate and the like. It may be used as a mixture of The amount of the aluminum chelate compound (F) is 0.08-0 with respect to 100 parts by weight of the total amount of the polyorganosiloxane (A), polyorganosiloxane (B), and polyorganohydrogensiloxane (D). .35 parts by weight is preferable. If the amount is less than 0.08 parts by weight, the adhesiveness to the glass increases with time and the peelability becomes insufficient. If it exceeds 0.35 parts by weight, the adhesiveness to the glass decreases with time. To do.

<Polyorganosiloxane (G)>
Polyorganosiloxane (G) used in the present invention, OH group content is from the general formula SiO _1/2 units and SiO _4/2 units in 0.1 to 5.0 wt%, SiO _1/2 units / SiO _4/2 unit molar ratio is 0.5 to 1.0, and it is used as a tackifier for improving the initial adhesiveness of the peelable silicone resin composition according to the present invention to glass, and it depends on the time with respect to glass. It can mix | blend in order to suppress a raise of adhesiveness. When the OH content exceeds 5.0% by weight, the curability of the composition decreases. If the molar ratio of SiO _1/2 unit / SiO _4/2 unit is less than 0.5 and more than 1.0, the adhesive force may not be sufficiently improved.

  In the present composition, as other optional components, alkyne alcohols such as 3-methyl-1-butyn-3-ol, 3,5-dimethyl-1-hexyn-3-ol, ethynylcyclohexanol; Enyne compounds such as 3-penten-1-yne and 3,5-dimethyl-3-hexen-1-yne; 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane Reaction inhibitors such as 1,3,5,7-tetramethyl-1,3,5,7-tetrahexenylcyclotetrasiloxane, 1,3 divinyltetramethyldisiloxane, and benzotriazole may be contained. This reaction inhibitor has a content that does not inhibit the curability due to the addition reaction, and the total number of blends of polyorganosiloxane (A), polyorganosiloxane (B), and polyorganohydrogensiloxane (C) is 100 parts by weight. On the other hand, it is preferably within the range of 0.0001 to 1 part by weight.

  In addition, this composition contains calcium carbonate, cinnabar sand, talc, carbon black, titanium oxide, zinc oxide, kaolin, silicon dioxide, melamine for viscosity adjustment and hardness adjustment as long as the object of the invention is not impaired. May contain inorganic fillers such as organic fillers, reinforcing materials such as glass fibers to reinforce cured resins, and hollow bodies such as shirasu balloons and glass balloons to reduce weight and adjust viscosity it can. In addition, antioxidants, organic pigments, fluorescent pigments, corrosion inhibitors, antioxidants, and the like can be used as appropriate.

  The release film according to claim 7 of the present invention is an easily adhesive-treated film formed by applying a polyester resin having a hydroxyl value of 3 to 45 mgKOH / g to at least one surface of a base film such as a polyester film to form an easily adhesive layer. Then, on the easy-adhesion layer, the peelable silicone resin composition according to any one of claims 1 to 6 is applied to form a silicone layer, or a base film is formed. The peelable silicone resin composition according to any one of claims 1 to 6 is similarly applied to an untreated surface which is a polyester film and does not have an easy-adhesion layer, thereby forming a silicone layer. It is a release film.

  The thickness of the easy-adhesion layer of the easy-adhesion-treated film is preferably in the range of 0.05 to 5.0 μm, and if it is less than 0.05 μm, the easy-adhesion effect cannot be sufficiently obtained, and if it exceeds 5.0 μm, the easy-adhesion layer itself The adhesion to the base film is reduced. As an easy adhesion layer coating solution and a silicone layer coating solution, a multi-stage roll coater represented by a three-offset gravure coater or a five-roll coater, a direct gravure coater, a bar coater, an air knife coater, etc. are used as appropriate. Is done. When the hydroxyl value of the polyester resin of the easy adhesion layer is less than 3 mgKOH / g, it cannot be said that the easy adhesion treatment film is subjected to the easy adhesion treatment, and the film is not yet treated even if the polyester resin is applied. Included in the definition of On the other hand, when the hydroxyl value of the polyester-based resin of the easy-adhesion layer exceeds 45 mgKOH / g, curing of the composition becomes poor. The hydroxyl value is an indicator of the polarity of the easy-adhesion layer. The higher the hydroxyl group, the higher the polarity, and the higher the adhesion between the composition and the easy-adhesion layer.

  After the silicone layer is formed, it is preferable that a separator such as a resin film or coated paper is further bonded to the silicone layer surface in order to prevent the surface of the silicone layer from being soiled and foreign matter and to improve the handleability of the release film.

  Next, the peelable silicone resin composition of the present invention will be described in detail with reference to examples and comparative examples.

<Examples and Comparative Examples>
As the polyorganosiloxane (A), a linear polydimethylsiloxane having a weight average molecular weight of 300 to 1,000,000 and having a vinyl group bonded to a part of silicon atoms other than the terminal (vinyl group content: 0.07 weight) A linear polydimethylsiloxane having a weight average molecular weight of 300 to 1,000,000 and having vinyl groups at both ends (vinyl group content: 0.01% by weight) as polyorganosiloxane (a), Linear polydimethylsiloxane having a weight average molecular weight of 1 to 100,000 is used as polyorganosiloxane (B), and the viscosity is 10 to 100 cSt / 25 ° C. as polyorganohydrogensiloxane (C). A polyorganohydrogensiloxane having hydrogen atoms directly bonded (hydrogen atom content: 14 mmol / g) is converted into a curing catalyst (D Platinum-vinyl dimer complex (Pt: 0.2% wt) as a reactive functional group-containing hydrolyzable silane compound (E), 3-glycidoxypropyltrimethoxysilane as an aluminum chelate compound (F), aluminum tris ethylacetoacetate, OH group content as a polyorganosiloxane (G) consists of SiO _1/2 units / SiO _4/2 units 1 wt%, the molar ratio of SiO _1/2 units / SiO _4/2 units MQ resin consisting of 0.7, toluene as a solvent, ethynylcyclohexanol as a reaction inhibitor, and mixed well with the formulation shown in Table 1 to obtain a uniform solution. It was set as the coating liquid of the example peelable silicone resin composition. Next, the coating solution is applied on the easy-adhesion layer of a 75 μm-thick polyester easy-adhesion treatment film having an easy-adhesion layer coated with a polyester resin having a hydroxyl value of 5 mg KOH / g and cured. A silicone layer was formed by coating the untreated surface of an untreated polyester film having a thickness of 75 μm, on which no layer had been formed, with a thickness of 20 μm after drying, and curing at 130 ° C. for 90 seconds. A release film coated with the peelable silicone resin compositions of Examples and Comparative Examples was obtained.

<Evaluation items and evaluation methods>

<Initial tackiness>
Each release film of Examples and Comparative Examples is formed into a 2.5 cm × 15 cm strip shape, and the silicone layer of the release film is closely attached to a 5 cm × 20 cm (thickness 0.25 cm) soda glass surface, which is defined in JISZ0237. A 2 kg hand roller is reciprocated once on the release film, and the silicone layer is pressure-bonded. After pressure bonding, the 180-degree peel strength (mN / 25 mm) is measured at 23 ° C. in accordance with JISZ0237. If the peel strength is 5 mN or more / 25 mm, it is judged that the film has sufficient adhesiveness. However, in this evaluation, 10 mN or more / 25 mm 50 mN or less / 25 mm was evaluated as ◯, and the others were evaluated as x.

<Adhesion after heating>
Each release film of Examples and Comparative Examples is formed into a 2.5 cm × 15 cm strip shape, and the silicone layer of the release film is closely attached to a 5 cm × 20 cm (thickness 0.25 cm) soda glass surface, which is defined in JISZ0237. A 2 kg hand roller is reciprocated once on the release film, and the silicone layer is pressure-bonded. Thereafter, it is cured for 14 days under conditions of 60 ° C. and 90% RH, and at 23 ° C., the 180 ° peel strength (mN / 25 mm) is measured according to JISZ0237. A peel strength of 20 mN or more / 25 mm 150 mN or less / 25 mm was evaluated as ◯, and other than this was evaluated as x.

<Initial adhesion with polyester film in which easy adhesion layer or easy adhesion layer is not formed>
Each release film of Examples and Comparative Examples is formed into a 2.5 cm × 15 cm strip shape, and the silicone layer of the release film is closely attached to a 5 cm × 20 cm (thickness 0.25 cm) soda glass surface, which is defined in JISZ0237. A 2 kg hand roller is reciprocated once on the release film, and the silicone layer is pressure-bonded. Thereafter, the release film is slowly peeled off, and the silicone layer of the release film is rubbed with a fingertip under the condition of 23 ° C. At this time, the case where the silicone layer was totally peeled from the easy-adhesion layer was evaluated as x, the case where it was partially peeled was evaluated as Δ, and the case where it was not peeled was evaluated as ○.

<Adhesiveness after heating with polyester film in which easy-adhesion layer or easy-adhesion layer is not formed>
Each release film of Examples and Comparative Examples is formed into a 2.5 cm × 15 cm strip shape, and the silicone layer of the release film is closely attached to a 5 cm × 20 cm (thickness 0.25 cm) soda glass surface, which is defined in JISZ0237. A 2 kg hand roller is reciprocated once on the release film, and the silicone layer is pressure-bonded. Then, after curing at 60 ° C. and 90% RH for 21 days, it is gradually cooled to 23 ° C., the release film is slowly peeled off, and the silicone layer of the release film is rubbed with a fingertip. At this time, the case where the silicone layer was totally peeled from the easy-adhesion layer was evaluated as x, the case where it was partially peeled was evaluated as Δ, and the case where it was not peeled was evaluated as ○.

<Adhesive residue>
Each release film of Examples and Comparative Examples is formed into a 2.5 cm × 15 cm strip shape, and the silicone layer of the release film is closely attached to a 5 cm × 20 cm (thickness 0.25 cm) soda glass surface, which is defined in JISZ0237. A 2 kg hand roller is reciprocated once on the release film, and the silicone layer is pressure-bonded. Then, after curing at 60 ° C. and 90% RH for 21 days, the sample is slowly cooled to 23 ° C., the release film is slowly peeled off, and the state of the glass surface is observed visually and touched. A glass surface with no cloudiness or stickiness was evaluated as ◯, and a glass surface with cloudiness or tackiness was evaluated as ×.

<Evaluation results>
The evaluation results are shown in Table 2.

Claims (7)

The base film is applied to the easy-adhesion layer of an easy-adhesion treatment film in which a polyester resin having a hydroxyl value of 3 to 45 mgKOH / g is applied to at least one surface of the base film, or the base film is a polyester film. A peelable silicone resin composition to be applied to a surface on which an easy adhesion layer is not formed,
A linear or branched polyorganosiloxane (A) having a vinyl group bonded to a silicon atom other than the terminal and having a weight average molecular weight of 300 to 1,000,000,
Linear or branched polyorganosiloxane (B) having vinyl groups at both ends and having a weight average molecular weight of 1 to 100,000,
A polyorganohydrogensiloxane (C) having a hydrogen atom directly bonded to a silicon atom other than the terminal;
A curing catalyst (D) required for the addition reaction;
A reactive functional group-containing hydrolyzable silane compound (E);
An aluminum chelate compound (F);
A peelable silicone resin composition comprising: Further, the OH group content is 0.1 to 5.0% by weight, and it comprises a general formula SiO _1/2 unit and SiO _4/2 unit, and the molar ratio of SiO _1/2 unit / SiO _4/2 unit is 0.00. The peelable silicone resin composition according to claim 1, comprising a polyorganosiloxane (G) that is 5 to 1.0.   The peelable silicone resin composition according to claim 1 or 2, wherein the reactive functional group-containing hydrolyzable silane compound (E) is 3-glycidoxypropyltrimethoxysilane.   The peelable silicone resin composition according to any one of claims 1 to 3, wherein the aluminum chelate compound (F) is aluminum trisethyl acetoacetate.   The reactive functional group-containing hydrolyzable silane compound (E) is added in an amount of 0.001 part by weight based on 100 parts by weight of the total amount of the polyorganosiloxane (A), polyorganosiloxane (B), and polyorganohydrogensiloxane (C). The peelable silicone resin composition according to claim 1, comprising 8 to 3.5 parts by weight.   The aluminum chelate compound (F) is 0.08 to 0.35 parts by weight based on 100 parts by weight of the total amount of the polyorganosiloxane (A), polyorganosiloxane (B) and polyorganohydrogensiloxane (C). The peelable silicone resin composition according to claim 1, comprising: On the easy-adhesion layer of the easy-adhesion treatment film formed by applying a polyester resin having a hydroxyl value of 3 to 45 mg KOH / g on at least one surface of the base film, or the base film is a polyester film and easy adhesion A release film, wherein a silicone layer is formed by applying the peelable silicone resin composition according to any one of claims 1 to 6 on a surface on which no layer is formed.