JP2020122116A - Peeling agent composition and peeling sheet - Google Patents

Abstract

To provide a solvent-free peeling agent composition that has excellent heavy release effect both at low speed peeling and high speed peeling, and has small difference in peeling force between low speed peeling and high speed peeling, and a peeling sheet.SOLUTION: A peeling agent composition contains the following (A)-(E) components. (A) A linear organopolysiloxane has an alkenyl group bound to a silicon atom. (B) An organopolysiloxane has a three-dimensional network structure, having R'SiOunit, and SiOunit and/or R'SiOunit (where, (B) component is following (B1) component, or a combination of (B1) component and (B2) component: (B1) an organopolysiloxane having an alkenyl group bound to a silicon atom; and (B2) an organopolysiloxane not having an alkenyl group bound to a silicon atom. (C) A liquid olefin. (D) An organohydrogenpolysiloxane has a hydrogen atom bound to a silicon atom. (E) A platinum group metal catalyst.SELECTED DRAWING: None

Description

The present invention relates to an addition reaction-curable release agent composition that gives an excellent heavy release effect, and a release sheet using the same. More specifically, it relates to a release agent composition that is not a solvent system or an emulsion system, and more preferably a solvent-free type release agent composition.

BACKGROUND ART Conventionally, in order to prevent adhesion and fixation of a base material such as paper or plastic and an adhesive material, a cured film of an organopolysiloxane composition is formed on the surface of the base material to impart release characteristics. As a method of forming a cured organopolysiloxane coating on the surface of the above-mentioned substrate, a method of forming a peelable coating by an addition reaction is widely used because of its excellent curability.

The method for forming a peelable film by this addition reaction includes a type in which the organopolysiloxane composition is dissolved in an organic solvent, a type in which an emulsifier is dispersed in water to form an emulsion, and a solvent-free type consisting only of the organopolysiloxane. However, since the solvent type has a drawback that it may be harmful to the human body and the environment, switching from the solvent type to the solventless type is progressing from the viewpoint of safety.

Generally, an organopolysiloxane composition for release paper is required to have various releasing forces according to the purpose. For applications requiring heavy release, a three-dimensional reticulated organopolysiloxane called MQ resin is used. A composition to which siloxane (M unit means R′ ₃ SiO _1/2 unit and Q unit means SiO _4/2 unit, where R′ is a monovalent hydrocarbon group) is widely used.

However, the MQ resin is often a resinous or highly viscous compound, and when it is added in a large amount, it cannot be used unless it is diluted with an organic solvent. Further, if it is added in a small amount, it is possible to use it without a solvent, but in that case, the heavy release effect is insufficient. Particularly in recent years, high-speed coating has been carried out for the purpose of improving productivity, and development of a solventless type composition having a lower viscosity and a high heavy peeling effect is desired.
Further, in a cured product obtained from a solventless type organopolysiloxane composition for release paper, the peeling force (low-speed peeling force) when the tape is peeled from the cured film at a low speed (for example, 0.3 m/min) is The higher the density, the heavier it becomes. Here, the crosslink density means the branch density due to the silethylene bond formed by the reaction of the vinyl group and the SiH group in the composition, and the density of the three-dimensional structure of the organopolysiloxane such as the Q unit. On the other hand, the peeling force (high-speed peeling force) when peeling from the cured film at a high speed (for example, 50 m/min) becomes smaller as the crosslinking density becomes higher. In general, an organopolysiloxane composition for release paper, which has a high heavy release effect, has a high crosslinking density, so that the low speed release force becomes heavy, but the high speed release force may become small. Therefore, there is also a demand for a composition in which both the low speed peeling force and the high speed peeling force are heavy and the difference between the peeling force between the low speed peeling and the high speed peeling is small.

JP-B-5-53183 (Patent Document 1) describes that an alkenyl group-containing MQ resin and an alkenyl group-free MQ resin are used in combination in an organopolysiloxane composition for release paper, which is a solventless type. It has the characteristics of achieving heavy peeling and little change in peeling force with time. However, only the peeling force at low speed peeling of 0.3 m/min is measured, and the peeling force at high speed peeling is not described. Further, Japanese Patent No. 2750896 (Patent Document 2) discloses an organopolysiloxane composition for forming a releasable cured film comprising a higher alkenyl group-containing organopolysiloxane, an organohydrogenpolysiloxane, and an alkenyl group-containing organopolysiloxane resin. Is described. By containing a higher alkenyl group, a low-temperature curability and a peeling force with little change over time are obtained, but no mention is made of the peeling force in high-speed peeling.

Further, as a method of performing heavy release by adding an organopolysiloxane resin having adhesiveness to an addition reaction type organopolysiloxane composition, for example, Japanese Patent Publication No. 6-086582 (Patent Document 3) discloses both ends. An adhesive silicone protective coating in which a partially dehydrated condensate of a hydroxyl group-containing organopolysiloxane and an MQ unit-containing organopolysiloxane resin is added to a curable silicone rubber composition is described. Since the silicone rubber and the organopolysiloxane resin have high viscosity or solid, a solvent is required.

Japanese Unexamined Patent Publication No. 7-188562 (Patent Document 4) describes a solventless release modifier using an alkenyl group-containing MQ resin and α,ω-diolefin. By using the alkenyl group-containing MQ resin and α,ω-diolefin, it is possible to impart a high peeling force in low-speed peeling, but high-speed peeling is not described.

JP-A-7-252360 (Patent Document 5) describes using an MQ resin containing a higher alkenyl group as a release modifier for a silicone-based release composition. By setting the molar ratio of the M unit and the Q unit of the MQ resin to 1.1 to 1.8, a solvent-free type silicone release composition can be obtained, which gives a high release force in low-speed and high-speed release. be able to. However, an MQ resin containing a higher alkenyl group is obtained by synthesizing an MQ resin containing a hydrogen atom (SiH) bonded to silicon, and then further subjecting the SiH to an α,ω-diolefin. However, it has a drawback that the synthesis is complicated.

JP-A-2010-37557 (Patent Document 6) discloses that (a1) the molar ratio of M units to Q units is 0.6 to 1.0, and the content of hydroxyl groups or alkoxy groups is 0.3 to 2. Condensation reaction of 100 parts by mass of MQ type resin in the range of 0% by mass and (a2) 20 to 150 parts by mass of chain polydiorganosiloxane having an average degree of polymerization of 100 to 1,000 having a hydroxyl group or an alkoxy group. A release control agent composed of a material is described. By adding the release modifier to the light-release addition reaction type organopolysiloxane composition, heavy release can be achieved in both low-speed and high-speed release. However, since the condensation reaction between the component (a1) and the component (a2) takes time, a heavy release composition that can be produced by a simpler and cheaper method is desired.

Japanese Patent Publication No. 5-53183 Japanese Patent No. 2750896 Japanese Patent Publication No. 6-086582 JP, 7-188562, A JP, 7-252360, A JP, 2010-37557, A

The present invention has been made in view of the above circumstances, is a solventless release agent composition having a low viscosity, an excellent heavy release effect for both low speed release and high speed release, and a small difference in release force between low speed release and high speed release. And a release sheet on which a cured film of the composition is formed.

The inventors of the present invention have conducted extensive studies to achieve the above object, and as a result, (A) a linear organopolysiloxane having at least two alkenyl groups bonded to a silicon atom in one molecule; ) A three-dimensional reticulated organopolysiloxane having an M unit and a Q unit and/or a T unit and having the following predetermined structure, (C) an olefin which is liquid at 25° C., and (D) hydrogen bonded to a silicon atom. A release agent composition containing an organohydrogenpolysiloxane having at least two atoms in one molecule and (E) a platinum group metal-based catalyst has an excellent heavy release effect in both low-speed release and high-speed release, and low-speed release. It was found that the difference in the peeling force between the high speed peeling and the high speed peeling became small, and the present invention was accomplished. In particular, by containing a liquid olefin at 25° C., the composition has a lower viscosity and is suitable as a solvent-free type release agent composition.

That is, the present invention provides a release agent composition containing the following components (A) to (E).
(A) Linear organopolysiloxane having at least two alkenyl groups bonded to silicon atoms in one molecule: 30 to 65 parts by mass based on 100 parts by mass of the total of the (A) component and the following (B) component. (B) an organopolysiloxane having a three-dimensional network structure having R′ ₃ SiO _1/2 units, and SiO _4/2 units and/or R′SiO _3/2 units (in the above formulas, R′ is A substituted or unsubstituted, monovalent hydrocarbon group having 1 to 12 carbon atoms, which may have an unsaturated bond): 35 with respect to 100 parts by mass of the total of the component (A) and the component (B). ~70 parts by mass,
The component (B) is the following component (B1), or a combination of the following (B1) component 15 to 69 parts by mass and the following (B2) component 1 to 20 parts by mass (however, the total is 35 to 70 parts by mass). (B1) Organopolysiloxane having a three-dimensional network structure having at least two alkenyl groups bonded to a silicon atom in one molecule.
(B2) Organopolysiloxane having the three-dimensional network structure, which does not have an alkenyl group bonded to a silicon atom.
(C) Olefin liquid at 25° C.: 0.1 to 20 parts by mass based on 100 parts by mass of the total of the components (A) and (B),
(D) Organohydrogenpolysiloxane having at least two hydrogen atoms bonded to silicon atoms in one molecule: the total number of alkenyl groups in the components (A), (B) and (C) The stripping agent composition, which comprises (D) an amount such that the number ratio of hydrogen atoms bonded to silicon atoms in the component is 0.5 to 5, and (E) a platinum group metal-based catalyst:a catalytic amount.

The present invention also provides a release sheet having a sheet-shaped base material and a cured film formed by curing the release agent composition on one or both surfaces of the base material.

As described above, in order to provide a solvent-free release agent composition that undergoes heavy release, it is desired to reduce the viscosity of the composition without adding a solvent. However, if the amount of the low-viscosity organopolysiloxane is increased in order to reduce the viscosity, high speed and light peeling can be achieved. Further, the viscosity cannot be lowered unless the amount of the low-viscosity organopolysiloxane is reduced or contained. On the other hand, the present invention was able to achieve low viscosity, low speed heavy peeling and high speed heavy peeling by incorporating a predetermined amount of a liquid olefin at 25° C. into the release agent composition. Furthermore, (B1) an organopolysiloxane having an alkenyl group is essential as the (B) three-dimensional reticulated organopolysiloxane contained in the release agent composition of the present invention, and (B2) an organopolysiloxane having no alkenyl group. May be used in combination, and the combined use can further reduce the difference in peeling force.

Since the release agent composition of the present invention has a low viscosity, it can be used as a solventless type. Further, both of the low speed peeling and the high speed peeling have an excellent heavy peeling effect, and the difference in the peeling force between the low speed peeling and the high speed peeling is small, so that it is useful as a material for a release sheet for heavy peeling.

Hereinafter, the present invention will be described in more detail.
[(A) Alkenyl group-containing linear organopolysiloxane]
The component (A) is a component for adjusting the viscosity of the composition and the peeling force of the cured product. The component (A) is a linear organopolysiloxane having at least 2, preferably 2 to 50, and more preferably 2 to 40, alkenyl groups bonded to silicon atoms in one molecule. The organopolysiloxane should have a viscosity at 25° C. of 5,000 mPa·s or less, preferably 3,000 mPa·s or less, more preferably 1,500 mPa·s or less. An organopolysiloxane having a linear molecular structure in which the main chain is composed of repeating diorganosiloxane units and the molecular chain ends are blocked with triorganosiloxy groups may be used. When the viscosity exceeds the above upper limit value, it may be a factor for lowering the crosslink density of the cured product, and it may be difficult to obtain the target heavy release effect, which is not preferable. The lower limit value is not particularly limited, but it is preferably 1 mPa·s or more, and more preferably 5 mPa·s or more.
Further, there is a possibility that a problem that the viscosity of the composition becomes extremely high may occur. In addition, in the present invention, the viscosity measurement is an absolute viscosity value measured by a B-type rotational viscometer at 25° C. (hereinafter, the same).

The alkenyl group bonded to the silicon atom may have 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms. Examples thereof include a vinyl group, an allyl group, a butenyl group, a pentenyl group, a hexenyl group, and a heptenyl group, and a vinyl group is preferable. The alkenyl group bonded to the silicon atom may be present at either the terminal of the molecular chain or the side chain of the molecular chain in the molecule of the organopolysiloxane, or at both of them.

Other than the alkenyl group, the organic group bonded to the silicon atom is not particularly limited as long as it has no aliphatic unsaturated bond. For example, it may be an unsubstituted or substituted monovalent hydrocarbon group having usually 1 to 12, preferably 1 to 10 carbon atoms. Examples of the unsubstituted or substituted monovalent hydrocarbon group include alkyl groups such as methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, and heptyl group; cycloalkyl groups such as cyclohexyl group; phenyl Aryl groups such as groups, tolyl groups, xylyl groups, and naphthyl groups; aralkyl groups such as benzyl groups and phenethyl groups; some or all of the hydrogen atoms of these groups include chlorine atoms, fluorine atoms, and bromine atoms; Examples thereof include halogenated alkyl groups such as chloromethyl group, 3-chloropropyl group, and 3,3,3-trifluoropropyl group, which are substituted with a halogen atom. It is preferably an alkyl group, and more preferably a methyl group.

中でも、より好ましくは、（ＣＨ_２＝ＣＨ）（ＣＨ_３）₂ＳｉＯ_1/2単位及び（ＣＨ_３）₂ＳｉＯ単位で構成された直鎖状オルガノポリシロキサンである。このようなオルガノポリシロキサンを用いることで、得られる硬化物の剥離力の調整がより容易となる。尚、（Ａ）成分は、一種単独で用いても二種以上を併用してもよい。 Examples of the linear organopolysiloxane (A) include the structures shown below.

Among them, a linear organopolysiloxane composed of (CH ₂ ═CH)(CH ₃ ) ₂ SiO _1/2 units and (CH ₃ ) ₂ SiO units is more preferable. By using such an organopolysiloxane, it becomes easier to adjust the peeling force of the obtained cured product. The component (A) may be used alone or in combination of two or more.

[(B) Three-dimensional reticulated organopolysiloxane]
The component (B) is a component for imparting a heavy release effect, and has the general formula R′ ₃ SiO _1/2 (M unit) and the general formula SiO _4/2 (Q unit) and/or the general formula R′SiO. It is an organopolysiloxane having a three-dimensional network structure containing _3/2 (T unit). In the above, R'is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 12 carbon atoms. The component (B) is preferably waxy or solid at 25°C. Here, the term "wax-like" means a gum-like substance (raw rubber-like substance) that exhibits almost no self-fluidity at 25° C. and is 10,000 Pa·s or more, particularly 100,000 Pa·s or more.

The component (B) is the following component (B1), or a combination of the following (B1) component 15 to 69 parts by mass and the following (B2) component 1 to 20 parts by mass (however, the total is 35 to 70 parts by mass). Is a quantity).
(B1) Organopolysiloxane having at least two alkenyl groups bonded to silicon atoms in one molecule and having the above-mentioned three-dimensional network structure (B2) Said three-dimensional network structure having no alkenyl groups bonded to silicon atoms With organopolysiloxane

The amount of the component (B) is 35 to 70 parts by mass, preferably 35 to 60 parts by mass, and more preferably 35 to 50 parts by mass, based on 100 parts by mass of the total of the components (A) and (B). Is. When the content of the component (B) exceeds the above upper limit value, the viscosity of the obtained composition becomes remarkably high, and the coating accuracy is lowered. If the amount of the component (B) is less than the above lower limit, the crosslink density of the cured product will decrease, making it difficult to obtain the target heavy release effect.

In the present invention, the (B) three-dimensional reticulated organopolysiloxane is essentially the above (B1) alkenyl group-containing organopolysiloxane, and may be a combination of (B2) alkenyl group-free organopolysiloxane. It is possible to reduce the difference in peeling force. When only the organopolysiloxane having an alkenyl group (B1) is contained as the component (B), the amount may be the amount of the component (B) described above. That is, it is 35 to 70 parts by mass, preferably 35 to 60 parts by mass, and more preferably 35 to 50 parts by mass based on 100 parts by mass of the total of the components (A) and (B1). If the above conditions are exceeded, the viscosity of the composition will be remarkably increased and the coating accuracy will be reduced. When the content of the component (B1) is less than the above lower limit value, the crosslink density of the cured product decreases, and it becomes difficult to obtain the target heavy release effect.

When the component (B1) and the component (B2) are used in combination, the total amount of the component (B1) and the component (B2) is 100 parts by mass of the component (A) and the component (B1) and the component (B2). 35 to 70 parts by mass, and 1 to 20 parts by mass of the component (B2) with respect to 15 to 69 parts by mass of the component (B1). Preferably, the total amount of the (B1) component and the (B2) component is 35 to 60 parts by mass with respect to the total of 100 parts by mass of the (A) component and the (B1) component and the (B2) component, and (B1 ) The amount is 1 to 20 parts by mass of the component (B2) with respect to 15 to 59 parts by mass of the component. More preferably, the total amount of the (B1) component and the (B2) component is 35 to 50 parts by mass with respect to 100 parts by mass of the (A) component and the total of the (B1) component and the (B2) component, and ( The amount is 1 to 20 parts by mass of the component (B2) with respect to 15 to 49 parts by mass of the component B1). When the amount of the component (B2) is too large relative to the amount of the component (B1), light peeling occurs at low speed, the difference between the peeling force between the low speed peeling and the high speed peeling becomes large, and the residual adhesion rate decreases, which is preferable. Absent. Hereinafter, the component (B1) and the component (B2) will be described in more detail.

[(B1) component]
The component (B1) is an alkenyl group-containing organopolysiloxane represented by the following average composition formula (2). It has at least two alkenyl groups bonded to a silicon atom in one molecule, and essentially has T units and/or Q units.
(R ⁵ ₃ SiO _1/2 ) ₁ (R ⁴ R ⁵ ₂ SiO _1/2 ) _m (R ⁴ R ⁵ SiO) _n (R ⁵ ₂ SiO) _p (R ⁴ SiO _3/2 ) _q (R ⁵ SiO _3/2 ) _r (SiO _4/2 ) _s (2)
(In the formula, R ⁴ is independently an alkenyl group having 2 to 8 carbon atoms, and R ⁵ is independently an unsubstituted or substituted monovalent hydrocarbon group having 1 to 12 carbon atoms, which is not an alkenyl group. Provided that at least 80 mol% of all R ⁵ are methyl groups, and l, m, n, p, q, r and s are each independently a number of 0 or more, provided that m+n+q>0. , Q+r+s>0, and l+m+n+p+q+r+s=1).

In the above formula (2), examples of the alkenyl group represented by R ⁴ include the silicon atom-bonded alkenyl groups exemplified in the component (A), and a vinyl group is particularly preferable. Examples of the unsubstituted or substituted monovalent hydrocarbon group represented by R ⁵ other than the alkenyl group include organic groups other than the silicon atom-bonded alkenyl group exemplified in the component (A). Of these, a methyl group is preferable, and at least 80 mol%, preferably 90 to 98%, of all R ^{5 s} are methyl groups. If the proportion of methyl groups is less than 80 mol% of the total R ⁵ , the compatibility with the above-mentioned component (A) is poor, and the release agent composition may be clouded and separated, and a uniform film may not be obtained. ..

In the above formula (2), l, m, n, p, q, r, and s are each independently a number of 0 or more, provided that m+n+q>0, q+r+s>0, and l+m+n+p+q+r+s=1. Is. Preferably, l is a number from 0 to 0.65, m is a number from 0 to 0.65, n is a number from 0 to 0.5 and p is a number from 0 to 0.5. , Q is a number from 0 to 0.8, r is a number from 0 to 0.8, and s is preferably a number from 0 to 0.6. Further, m+n+q is 0 to 0.8, particularly preferably 0 to 0.65, q+r+s is 0.1 to 0.8, and particularly preferably 0.2 to 0.6.

In the component (B1), the content of the alkenyl group bonded to the silicon atom is preferably 0.01 to 1 mol, and more preferably 0.05 to 0.5 mol, per 100 g of the component (B1). Is more preferable. When the content of the alkenyl group satisfies the range of 0.01 to 1 mol, the crosslinking reaction proceeds sufficiently and a cured product having higher hardness can be obtained.

The component (B1) preferably has a weight average molecular weight of 1,000 to 10,000, more preferably 1,500 to 9,000, and even more preferably 2,000 to 8,000. The weight average molecular weight in the present invention is an average molecular weight obtained by gel permeation chromatography (hereinafter referred to as GPC) analysis in terms of standard polystyrene (the same applies hereinafter).

Examples of the (B1) organopolysiloxane include the following compounds.
(Me ₃ SiO _1/2 ) _l (ViMe ₂ SiO _1/2 ) _m (SiO _4/2 ) _s
(ViMe ₂ SiO _1/2 ) _m (SiO _4/2 ) _s
(ViMeSiO) _n (Me ₂ SiO) _p (MeSiO _3/2 ) _r
(ViMe ₂ SiO _1/2 ) _m (Me ₂ SiO) _p (ViSiO _3/2 ) _q
(ViMe ₂ SiO _1/2 ) _m (Me ₂ SiO) _p (MeSiO _3/2 ) _r
(Me ₃ SiO _1/2 ) _l (ViMe ₂ SiO _1/2 ) _m (Me ₂ SiO) _p (MeSiO _3/2 ) _r
(Me ₃ SiO _1/2 ) _l (ViMe ₂ SiO _1/2 ) _m (Me ₂ SiO) _p (ViMeSiO) _n (MeSiO _3/2 ) _r
(In the formula, Me is a methyl group, Vi is a vinyl group, and l, m, n, p, q, r, and s are as above-mentioned.)
Among them, organopolysiloxane composed of Me ₃ SiO _1/2 , ViMe ₂ SiO _1/2, and SiO _4/2 units is particularly preferable. By using such an organopolysiloxane, the obtained cured product has a sufficiently high crosslink density, and a desired heavy release effect can be obtained. The component (B1) may be used alone or in combination of two or more.

[(B2) component]
The component (B2) is an organopolysiloxane having a three-dimensional network structure that does not have an alkenyl group bonded to a silicon atom, is represented by the following average composition formula (3), and requires a T unit and/or a Q unit. Those contained in.
(R ⁶ ₃ SiO _1/2 ) _t (R ⁶ ₂ SiO) _u (R ⁶ SiO _3/2 ) _v (SiO _4/2 ) _w (3)
(In the formula, R ⁶ is independently an unsubstituted or substituted monovalent hydrocarbon group having 1 to 12 carbon atoms, which is not an alkenyl group, provided that at least 80 mol% of all R ⁶ are methyl groups. , T, u, v, and w are each independently a number of 0 or more, provided that v+w>0 and t+u+v+w=1).

In the above formula (3), the unsubstituted or substituted monovalent hydrocarbon group which is not an alkenyl group and is represented by R ⁶ is other than the alkenyl group bonded to a silicon atom, which is exemplified for the component (A). The organic groups of It is preferably a methyl group, and at least 80 mol% of all R ⁶ is a methyl group. If the proportion of methyl groups is less than 80 mol% of the total R ⁶ , the compatibility with the above-mentioned component (A) is poor, and the composition may be clouded and separated, and a uniform film may not be obtained. t, u, v, and w are each independently a number of 0 or more, provided that v+w>0 and t+u+v+w=1. Preferably t is a number from 0 to 0.65, u is a number from 0 to 0.5, v is a number from 0 to 0.8 and w is a number from 0 to 0.6. Is good. Further, v+w is preferably 0.1 to 0.8, and particularly preferably 0.2 to 0.6.

The component (B2) preferably has a weight average molecular weight of 1,000 to 10,000, more preferably 1,500 to 9,000, and still more preferably 2,000 to 8,000. The method for measuring the weight average molecular weight is as described above.

Examples of the organopolysiloxane (B2) include the following compounds.
(Me ₃ SiO _1/2 ) _t (MeSiO _3/2 ) _v
(Me ₃ SiO _1/2 ) _t (SiO _4/2 ) _w
(Me ₂ SiO) _u (MeSiO _3/2 ) _v
(Me ₃ SiO _1/2 ) _t (Me ₂ SiO) _u (MeSiO _3/2 ) _v
(Me ₃ SiO _1/2 ) _t (Me ₂ SiO) _u (SiO _4/2 ) _w
(Me ₃ SiO _1/2 ) _t (Me ₂ SiO) _u (MeSiO _3/2 ) _v (SiO _4/2 ) _w
(In the formula, Me is a methyl group, and t, u, v, and w are as above-mentioned.)
Above all, an organopolysiloxane composed of Me ₃ SiO _1/2 and SiO _4/2 units is more preferable. By using such an organopolysiloxane, a high heavy release effect can be obtained. The component (B2) may be used alone or in combination of two or more.

[(C) Liquid olefin]
The component (C) is a so-called thinning agent that can reduce the viscosity of the composition by adding a small amount. It is not particularly limited as long as it is an olefin having a liquid form at 25° C., and may be appropriately selected from known olefins, but monoolefin is particularly preferable. For example, in the case of diolefin, the cross-linking density becomes too high, which may cause peeling noise during peeling. Preferably, it is a linear monoolefin having 10 to 18 carbon atoms or a branched monoolefin having 10 or more carbon atoms.

Conventionally, in order to reduce the viscosity of the organopolysiloxane composition, a method of adding a solvent or adding a low-viscosity organopolysiloxane component has been adopted, but when using a solvent having high volatility However, it may be harmful to the human body and the environment, and the use of a solvent is not preferable from the viewpoint of safety. Although the viscosity can be reduced by adding a low-viscosity organopolysiloxane component having low volatility, the inventors of the present invention have made earnest studies, and as a result, the viscosity-reducing effect is lower than that of a hydrocarbon compound. Therefore, in order to reduce the viscosity by adding the low-viscosity organopolysiloxane component, it is necessary to add a large amount of the component, and as a result, it becomes difficult to obtain the target heavy release effect.
On the other hand, an olefin that is liquid at 25° C. (particularly preferably a linear or branched monoolefin having 10 to 18 carbon atoms) has a high viscosity reducing effect on the organopolysiloxane composition. A small amount can reduce the viscosity and does not impair the heavy release effect. Further, since it has a reactive group (particularly an olefin part) with the organopolysiloxane composition (particularly SiH), it is not taken into the cured film, volatilized or transferred to the tape. Therefore, it is very useful in controlling the viscosity of the release agent composition.

In the present invention, the olefin may be linear or branched, but is preferably a linear monoolefin having 10 to 18 carbon atoms or a branched monoolefin having 10 or more carbon atoms. The linear monoolefin has preferably 10 to 18 carbon atoms, more preferably 12 to 18 carbon atoms, and further preferably 14 to 18 carbon atoms. If the number of carbon atoms of the monoolefin exceeds the above upper limit, it may become solid at 25°C. Further, when the number of carbon atoms of the monoolefin is less than the lower limit value described above, volatility increases, which may be harmful to the human body and the environment. Examples of such linear monoolefins include 1-tetradecene, 1-hexadecene, and 1-octadecene. More specifically, commercially available products of the product name “Linearene” (manufactured by Idemitsu Kosan Co., Ltd.) (eg, product names “Linearene 14”, “Linearlen 16”, “Linearlen 18”, etc.) can be used.

From the viewpoint of volatility, the branched monoolefin preferably has 10 or more carbon atoms, and more preferably 15 or more carbon atoms. The upper limit of the number of carbon atoms is not particularly limited as long as it is liquid at 25°C. It is preferably 50 or less, more preferably 40 or less. Further, as in the case of HS dimer A-20P exemplified below, when the branched monoolefin is a mixture of two or more kinds, a small amount of the branched monoolefin having more than 50 carbon atoms may be mixed. Examples of such branched mono-olefins include, for example, a series of trade names "HS dimer" (manufactured by Toyokuni Oil Co., Ltd.) represented by the following formula (for example, trade names "A-20" and "A-20P"). Etc.) commercial products can be used. As the component (C), one type may be used alone, or two or more types may be used in combination.

The blending amount of the component (C) is 0.1 to 20 parts by mass, preferably 0.1 to 18 parts by mass, more preferably 100 parts by mass of the components (A) and (B). Is 0.3 to 15 parts by mass. When the amount of the component (C) exceeds the above upper limit value, the viscosity of the obtained composition becomes too low and the coatability deteriorates. If the amount of the component (C) is less than the above lower limit value, the effect as a thickener may not be sufficiently obtained, and the viscosity of the composition becomes high, which is not preferable.

[(D) Organohydrogenpolysiloxane]
The component (D) is an organohydrogenpolysiloxane having at least two hydrogen atoms bonded to silicon atoms (hereinafter referred to as SiH groups) in one molecule, and is a known organopolysiloxane used in addition reaction type silicone compositions. Any hydrogen siloxane may be used. For example, the following average composition formula (1):
^{_{R 1 a H b SiO (4}} -a-b) / 2 ··· (1)
(In the formula, R ¹ independently represents an unsubstituted or substituted monovalent hydrocarbon group having 1 to 12 carbon atoms, which does not contain an alkenyl group, provided that at least 50 mol% of all R ¹ are methyl groups. , A and b are numbers satisfying 0.7≦a≦2.1, 0.001≦b≦1.0, and 0.8≦a+b≦3.0.)
It is represented by.

The alkenyl groups contained in the components (A), (B) and (C) and the SiH groups in the component (D) undergo an addition reaction to form a crosslinked structure. That is, the component (D) functions as a crosslinking agent. The component (D) preferably has a viscosity at 25° C. of 1,000 mPa·s or less, more preferably 0.5 to 500 mPa·s, and further preferably 2 to 200 mPa·s. If the viscosity exceeds the above upper limit, the composition as a whole may have a high viscosity, and the coating accuracy may decrease. The viscosity is a value of absolute viscosity measured by a B-type rotational viscometer at 25°C. From the viewpoint of crosslinking balance, the blending amount of the component (D) is such that the number ratio of SiH groups in the component (D) to the total number of alkenyl groups in the components (A), (B) and (C) is 0. An amount of 0.5 to 5.0, preferably 0.7 to 3.0 is preferable. If the amount of the component (D) does not satisfy the above range, the crosslinking balance may be inappropriate.

The content of the SiH group in the component (D) is preferably 0.1 to 2 mol, more preferably 0.2 to 1.7 mol, per 100 g of the component (D). In the above average composition formula (1), the unsubstituted or substituted monovalent hydrocarbon group containing no alkenyl group represented by R ¹ is a silicon other than the alkenyl group exemplified for the component (A). Examples include organic groups bonded to atoms. A methyl group is preferable, and it is preferable that at least 50 mol %, typically 60 to 100 mol% of all R ¹ be a methyl group. When the proportion of methyl groups is less than 50 mol% of the total R ¹ , the compatibility with the components (A) and (B) is poor, and the release agent composition may become cloudy or phase-separate. In the average composition formula (1), a is a positive number satisfying 0.7≦a≦2.1, preferably 1.0≦a≦2.0, and b is 0.001≦b≦1.0. , Preferably a positive number satisfying 0.01≦b≦0.98, and a+b is a positive number satisfying 0.8≦a+b≦3.0, preferably 1.3≦a+b≦2.5.

The component (D) has at least two SiH groups in one molecule, usually 2 to 200, and preferably 2 to 100. The SiH group may be located at the end of the molecular chain, in the middle of the molecular chain, or at both of them. The molecular structure of the organohydrogenpolysiloxane may be linear, cyclic, branched or three-dimensional network structure, but the number of silicon atoms (or the degree of polymerization) in one molecule is usually 2 to About 300 pieces, preferably about 3 to 200 pieces, are desirable.

Examples of the organohydrogenpolysiloxane represented by the above average composition formula (1) include, for example, a methylhydrogensiloxane/dimethylsiloxane cyclic copolymer, a dimethylsiloxy/methylhydrogensiloxane copolymer capped with trimethylsiloxy groups at both ends, Both ends dimethyl hydrogen siloxy group blocked dimethyl polysiloxane, both ends dimethyl hydrogen siloxy group blocked dimethyl siloxane/methyl hydrogen siloxane copolymer, both ends trimethyl siloxy group blocked methyl hydrogen siloxane/diphenyl siloxane copolymer, both ends Trimethylsiloxy group-blocked methylhydrogensiloxane/diphenylsiloxane/dimethylsiloxane copolymer, trimethylsiloxy group-blocked methylhydrogensiloxane/methylphenylsiloxane/dimethylsiloxane copolymer, both ends dimethylhydrogensiloxy group-blocked methylhydrogen Examples thereof include siloxane/dimethylsiloxane/diphenylsiloxane copolymers and dimethylhydrogensiloxy group-blocked methylhydrogensiloxane/dimethylsiloxane/methylphenylsiloxane copolymers at both ends. As the component (D), one type may be used alone, or two or more types may be used in combination.

Examples of the component (D) include cyclic siloxanes and linear siloxanes represented by the following formula.

[(E) Platinum Group Metal Catalyst]
The platinum group metal-based catalyst of component (E) is a catalyst for promoting the addition reaction of components (A), (B), and (C) and (D), and promotes the so-called hydrosilylation reaction. Any of those known to those skilled in the art can be used. Examples of such platinum group metal-based catalysts include platinum-based, palladium-based, rhodium-based, and ruthenium-based catalysts, and of these, platinum-based catalysts are particularly preferably used. Examples of the platinum-based catalyst include chloroplatinic acid, alcoholic or aldehyde solutions of chloroplatinic acid, complexes of chloroplatinic acid with various olefins or vinylsiloxanes, complexes of platinum with various olefins or vinylsiloxanes, and the like. ..

The blending amount of the component (E) may be a so-called effective amount as a catalyst. For example, from the viewpoint of obtaining a good cured film and economically, the platinum group metal mass is 0.1 in terms of the total mass of the component (A), the component (B), the component (C) and the component (D). ˜1000 ppm, more preferably 1 to 500 ppm.

[Other ingredients]
In addition to the components (A) to (E), the release agent composition of the present invention may contain other optional components. For example, the following components are included. These other components may be used alone or in combination of two or more.

-Alkenyl group-containing compound other than (A) component, (B) component and (C) component In the composition of the present invention, in addition to the (A) component, (B) component and (C) component, (D) An alkenyl group-containing compound that undergoes an addition reaction with the components may be appropriately added within a range that does not impair the effects of the present invention. As such an alkenyl group-containing compound other than the component (A), the component (B) and the component (C), those involved in the formation of a cured product are preferable, and each compound has at least one alkenyl group (A ), organopolysiloxanes other than the component (B) and the component (C). The molecular structure may be, for example, linear, cyclic, branched, or three-dimensional network.

-Addition reaction control agent In order to secure a pot life, an addition reaction control agent can be mix|blended with this invention composition. The addition reaction control agent is not particularly limited as long as it is a compound having a curing suppressing effect on the above-mentioned (E) platinum group metal-based catalyst, and may be any conventionally known one. For example, phosphorus-containing compounds such as triphenylphosphine; nitrogen-containing compounds such as tributylamine, tetramethylethylenediamine, benzotriazole; sulfur-containing compounds; acetylene alcohols (eg, 1-ethynylcyclohexanol, 3,5-dimethyl-1- Hexylene-3-ol) and other acetylenic compounds; compounds containing two or more alkenyl groups; hydroperoxy compounds; maleic acid derivatives and the like. The degree of curing inhibition effect of the addition reaction control agent depends on its chemical structure. Therefore, the addition amount of each addition reaction control agent to be used may be appropriately adjusted according to a conventionally known method. By adding an appropriate amount of the addition reaction control agent, the release agent composition becomes more excellent in long-term storage stability at room temperature and heat curability.

-Other optional components Furthermore, if necessary, known antioxidants, pigments, stabilizers, antistatic agents, defoaming agents, adhesion improvers, thickeners, or silica, as long as the effects of the present invention are not impaired. Inorganic fillers such as The blending amount may be appropriately selected according to the conventional technique.

[Release composition]
The composition of the present invention preferably has a viscosity of 50 to 500 mPa·s at 25°C. More preferably, it is 80 to 450 mPa·s. If the viscosity is out of the above range, there may occur a problem such that coating cannot be performed when forming a cured coating on a substrate, or even if coating is possible, a uniform coating cannot be obtained. Since the composition of the present invention does not require a solvent, it can be a solvent-free release agent composition.

[Method for producing composition for release sheet]
The method for producing the release agent composition of the present invention is not particularly limited, but after the components (A) to (D) and optional components are uniformly mixed in advance, the catalyst (E) is added immediately before use. However, it is desirable in terms of pot life.

[Release sheet]
The present invention further provides a release sheet having a sheet-like base material and a cured film formed by curing the release agent composition on one or both surfaces of the base material. The coating method is not particularly limited, for example, the composition of the present invention, a comma coater, a lip coater, a roll coater, a die coater, a knife coater, a blade coater, a rod coater, a kiss coater, a gravure coater, a wire bar coater, etc. Using a coating method such as coating, screen coating, dip coating, or cast coating, 0.01 to 100 g/m ² coating on one or both sides of a sheet-shaped substrate such as paper and film After that, a cured film can be formed on the substrate by heating at a temperature in the range of 50 to 200° C. for 1 to 120 seconds. When the release layers are formed on both sides of the base material, it is preferable to perform the operation of forming a cured film on each side of the base material.

The sheet-shaped substrate includes paper and various known films. Examples of the substrate include various coated papers such as polyethylene laminated paper, glassine paper, high-quality paper, kraft paper, and clay-coated paper, synthetic paper such as YUPO, polyethylene film, polypropylene film such as CPP and OPP, polyethylene terephthalate. Examples of the film include polyester film, polyamide film, polyimide film, polylactic acid film, polyphenol film, and polycarbonate film. Further, it may be a process paper for manufacturing artificial leather, a ceramic sheet, a double-sided separator and the like. In order to improve the adhesion between these base material and the release layer (cured film), the base material surface may be subjected to corona treatment, etching treatment, primer treatment or plasma treatment.

More specifically, as a method for producing a release sheet, for example, after applying the release agent composition of the present invention onto a glassine paper substrate at 0.6 to 1.5 g/m ² , heating at 150° C. for 30 seconds Can be manufactured by.

The release sheet of the present invention has heavy release at low speed release and high speed release. That is, a peeling force (low-speed peeling force) measured at a 180° angle and a peeling speed of 0.3 m/min was 0.3 N/50 mm or more by sticking a polyester adhesive tape of 50 mm width on the cured coating surface of the peeling sheet. And the peeling force (high-speed peeling force) measured at an angle of 180° and a peeling speed of 50 m/min is 0.5 N/50 mm or more. Furthermore, the release sheet of the present invention is also characterized in that the difference between the low speed peel force and the high speed peel force is small. More preferably, the difference between the low-speed peeling force and the high-speed peeling force is 0.3 N/50 mm or less, and the smaller the difference, the more preferable. Thereby, it can be suitably used as a release material having a high heavy release effect.

Hereinafter, the present invention will be described in more detail by showing Examples and Comparative Examples, but the present invention is not limited to the following Examples. The viscosities listed below are all values measured at 25° C. using a B-type rotational viscometer. Moreover, in the following, a part represents a mass part. In the following, Me and Vi represent a methyl group and a vinyl group, respectively.

（Ｄ）成分
（Ｄ１）（Ｍｅ_３ＳｉＯ_１／２）_２（ＭｅＨＳｉＯ）_５０
ＳｉＨ基含有量：１．５８ｍｏｌ／１００ｇ、粘度：２０ｍＰａ・ｓ
（Ｄ２）（Ｍｅ_３ＳｉＯ_１／２）_２（ＭｅＨＳｉＯ）_５０（Ｍｅ_２ＳｉＯ）_２０
ＳｉＨ基含有量：１．０８ｍｏｌ／１００ｇ、粘度：４４ｍＰａ・ｓ
（Ｅ）成分
（Ｅ）触媒：白金−ビニルシロキサン錯体
（Ｆ）成分（その他の成分）
（Ｆ）付加反応制御剤（ポットライフ延長剤）：１−エチニルシクロヘキサノール The components used in the examples and comparative examples are as follows. In the following, the vinyl value is the number of moles of vinyl groups with respect to 100 g of each component, and the SiH group content is the number of moles of SiH groups with respect to 100 g of each component. Further, the bonding order of each siloxane unit shown in parentheses is not limited to the following.
Component (A) (A1) (ViMe ₂ SiO _1/2 ) ₂ (Me ₂ SiO) ₄₀
Vinyl value: 0.063 mol/100 g, viscosity: 50 mPa·s
(A2) (ViMe ₂ SiO _1/2 ) ₂ (Me ₂ SiO) ₈₀
Vinyl value: 0.033 mol/100 g, viscosity: 120 mPa·s
(A3) (ViMe ₂ SiO _1/2 ) ₂ (Me ₂ SiO) ₂₁₀
Vinyl value: 0.013 mol/100 g, viscosity: 940 mPa·s
(A4) (ViMe ₂ SiO _1/2 ) ₂ (Me ₂ SiO) ₆
Vinyl value: 0.317 mol/100 g,
Viscosity: 7.0 mPa·s (low-viscosity organopolysiloxane component)
Component (B) (B1) (Me ₃ SiO _1/2 ) _0.38 (ViMe ₂ SiO _1/2 ) _0.06 (SiO _4/2 ) _0.56
Vinyl value: 0.086 mol/100 g, solid at 25° C. (B2-1) (Me ₃ SiO _1/2 ) _0.41 (SiO _4/2 ) _0.59
No vinyl group, solid at 25° C. (B2-2) (Me ₃ SiO _1/2 ) _0.52 (SiO _4/2 ) _0.48
No vinyl group, solid (C) component (C1) 1-hexadecene at 25°C (Linearene 16 manufactured by Idemitsu Kosan Co., Ltd.)
(C2) Branched olefin represented by the following structure (HS Dimmer A-20, manufactured by Toyokuni Oil Co., Ltd.)

Component (D) _{(D1) (Me 3 SiO 1/2} ) 2 (MeHSiO) 50
SiH group content: 1.58 mol/100 g, viscosity: 20 mPa·s
_{(D2) (Me 3 SiO 1/2} ) 2 (MeHSiO) 50 (Me 2 SiO) 20
SiH group content: 1.08 mol/100 g, viscosity: 44 mPa·s
(E) component (E) catalyst: platinum-vinyl siloxane complex (F) component (other components)
(F) Addition reaction control agent (pot life extender): 1-ethynylcyclohexanol

[Example 1]
The above-mentioned (A1) average formula: (ViMe ₂ SiO _1/2 ) ₂ (Me ₂ SiO) ₄₀ represented by the linear dimethylpolysiloxane, and the above-mentioned (B1) average formula (Me ₃ SiO _1/2 ) _{0. 38} (ViMe ₂ SiO _1/2 ) _0.06 (SiO _4/2 ) _0.56 mixed with a xylene solution of an organosiloxane at a mass ratio of 45.9/45.9 in terms of solid content. did. After removing xylene from the mixed solution at 150° C. under reduced pressure of 20 mmHg or less and cooling, 2.0 parts of the above (C1)1-hexadecene, the above (D1) average formula: (Me ₃ SiO _1/2 ) ₂ 6.0 parts of methyl hydrogen polysiloxane represented by (MeHSiO) ₅₀ and 0.2 part of the above (F) 1-ethynylcyclohexanol were mixed to obtain a transparent liquid. (The ratio of the number of SiH groups in the component (D1) to the total number of alkenyl groups in the components (A1), (B1) and (C1), that is, H/Vi is 1.2.
To the mixture obtained above, the above (E) catalyst is added so as to be 100 ppm in terms of platinum mass based on the total mass of the above (A1), (B1), (C1) and (D1) components, and mixed by stirring. Thus, a transparent composition having a viscosity of 290 mPa·s was obtained.

[Examples 2-8, Comparative Examples 1-7]
Following the same procedure as in Example 1, after mixing the components (A) and (B) with the compositions shown in Tables 1 to 3 below, xylene in the component (B) was removed by distillation under reduced pressure. After mixing the component (C), the component (D), and the component (F), the platinum catalyst (E) was mixed to obtain the compositions of Examples 2-8 and Comparative Examples 1-6. Tables 1 to 3 below show the blending amounts of each component. A coated article (release sheet) was produced by the method described below using the obtained composition and evaluated.

[Peeling force]
・Low speed and high speed peel test:
The obtained composition was applied on a surface of glassine paper having a thickness of 65 μm in an amount of 1.0 to 1.1 g/m ² and heated in a hot air dryer at 150° C. for 30 seconds to form a cured film. The obtained cured film was subjected to separator aging at 70° C. for 1 day, and a 50 mm width polyester adhesive tape (NO. 31B75 high, Nitto Denko product name) was attached to the surface of the cured film, and the load was 25 g and the load was 50 gf/cm ² . The pieces were laminated and aged for 1 day. After that, one end of the tape was peeled off, and the end was pulled at a peeling speed of 0.3 m/min or at a peeling speed of 50 m/min in the direction of an angle of 180° with respect to the glassine paper as the base material to peel off the peeling force. (N/50 mm) was measured using a tensile tester. As the tensile tester, Shimadzu Corporation AGS-50G type was used when the peeling speed was 0.3 m/min, and when the peeling speed was 60 m/min, TESTER 702 TE-702 high-speed peeling tester 300 mTYPE was used.

[Residual adhesion rate]
A 25 mm width polyester adhesive tape (NO. 31B35 high, Nitto Denko product name) was attached to the surface of the cured film after the separator aging and aged at 70° C. under a load of 20 gf/cm ² for 1 day. The tape was peeled off from the cured film, adhered to a PET film of 50 μm, pressed back and forth once with a 2 kg tape roller, and then peeled at a 180° angle with a tensile tester at 0.3 m/min. The required force F (N/25 mm) was measured. As a comparison, the force F ₀ (N/25 mm) required for peeling was measured in the same manner as above with respect to the polyester pressure-sensitive adhesive tape bonded to a Teflon (registered trademark) plate instead of the cured film. The adhesive strength of the polyester adhesive tape after peeling from the release layer was determined by comparing the remaining adhesive strength (residual adhesion rate (%)) of the polyester adhesive tape peeled from the Teflon (registered trademark) plate. Calculated by the formula: F/F ₀ ×100. The results are shown in Tables 1-3.

As shown in Table 3, the composition of Comparative Example 1 containing no (C) liquid olefin and containing a large amount of the low-viscosity organopolysiloxane (A4), although the viscosity was within the desired range, had a low viscosity. Peeling force is light (the force required for peeling is small). Therefore, when the amount of the component (A4) is reduced based on the composition of the comparative example 1 as in the comparative example 2 or the composition does not include both the (C) component and the (A4) component as in the comparative example 3, the peeling force is increased. Was heavier, but the viscosity of the resulting composition was higher. Although the compositions of Comparative Examples 2 and 3 could be applied to glassine paper, unevenness occurred during the application, and a uniform applied surface could not be obtained. On the contrary, in Comparative Example 5 in which a large amount of the component (C) was added, the viscosity became too low and coating could not be performed. Further, Comparative Example 4, which contains a large amount of the organopolysiloxane (B2-1) component containing no vinyl group, has low peeling at low speed and a large peeling force difference between low-speed peeling and high-speed peeling. This is because there are many non-reactive organopolysiloxanes, and the residual adhesion rate also decreased. Furthermore, the composition of Comparative Example 6 in which the total amount of the component (B) was small showed light peeling in both low-speed peeling and high-speed peeling, and did not have heavy peeling.

On the other hand, as shown in Tables 1 and 2, the release agent compositions (Examples 1 to 8) of the present invention have a viscosity of 500 mPa·s or less at 25° C., which is suitable as a solvent-free type heavy release composition. Have The release sheet obtained using the composition has a heavy release force for both low speed release and high speed release (a large force is required for release), and the difference between the release force between high speed release and low speed release is small. Therefore, the cured film obtained from the composition can be suitably used for a release sheet having heavy release.

The release agent composition of the present invention suitably functions as a solventless release agent. By forming a cured film of the release agent composition on the surface of a base material such as a paper base material and a plastic base material, a release paper and a release film having a high release force are provided.

Claims (9)

A release agent composition comprising the following components (A) to (E).
(A) Linear organopolysiloxane having at least two alkenyl groups bonded to silicon atoms in one molecule: 30 to 65 parts by mass based on 100 parts by mass of the total of the (A) component and the following (B) component. (B) an organopolysiloxane having a three-dimensional network structure having R′ ₃ SiO _1/2 units, and SiO _4/2 units and/or R′SiO _3/2 units (in the above formulas, R′ is A substituted or unsubstituted, monovalent hydrocarbon group having 1 to 12 carbon atoms, which may have an unsaturated bond): 35 with respect to 100 parts by mass of the total of the component (A) and the component (B). ~70 parts by mass,
The component (B) is the following component (B1), or a combination of the following (B1) component 15 to 69 parts by mass and the following (B2) component 1 to 20 parts by mass (however, the total is 35 to 70 parts by mass). (B1) Organopolysiloxane having a three-dimensional network structure having at least two alkenyl groups bonded to a silicon atom in one molecule.
(B2) Organopolysiloxane (C) having no alkenyl group bonded to a silicon atom and having a three-dimensional network structure, which is liquid at 25° C.: 100 parts by mass of the total of (A) component and (B) component. 0.1 to 20 parts by mass,
(D) Organohydrogenpolysiloxane having at least two hydrogen atoms bonded to silicon atoms in one molecule: the total number of alkenyl groups in the components (A), (B) and (C) The stripping agent composition, which comprises (D) an amount such that the number ratio of hydrogen atoms bonded to silicon atoms in the component is 0.5 to 5, and (E) a platinum group metal-based catalyst:a catalytic amount. The release agent composition according to claim 1, wherein the component (B1) is represented by the following average composition formula (2) and the component (B2) is represented by the following average composition formula (3).
[Chemical 1]
(R ⁵ ₃ SiO _1/2 ) ₁ (R ⁴ R ⁵ ₂ SiO _1/2 ) _m (R ⁴ R ⁵ SiO) _n (R ⁵ ₂ SiO) _p (R ⁴ SiO _3/2 ) _q (R ⁵ SiO _3/2 ) _r (SiO _4/2 ) _s (2)
(In the formula, R ⁴ is independently an alkenyl group having 2 to 8 carbon atoms, and R ⁵ is independently an unsubstituted or substituted monovalent hydrocarbon group having 1 to 12 carbon atoms, which is not an alkenyl group. However, at least 80 mol% of all R ⁵ are methyl groups, and l, m, n, p, q, r and s are each independently a number of 0 or more, provided that m+n+q>0, q+r+s>0 and l+m+n+p+q+r+s=1)
[Chemical 2]
(R ⁶ ₃ SiO _1/2 ) _t (R ⁶ ₂ SiO) _u (R ⁶ SiO _3/2 ) _v (SiO _4/2 ) _w (3)
(In the formula, R ⁶ is independently an unsubstituted or substituted monovalent hydrocarbon group having 1 to 12 carbon atoms, which is not an alkenyl group, provided that at least 80 mol% of all R ⁶ are methyl groups. , T, u, v, and w are each independently a number of 0 or more, provided that v+w>0 and t+u+v+w=1). The release agent composition according to claim 1 or 2, wherein the component (C) is a linear monoolefin having 10 to 18 carbon atoms or a branched monoolefin having 10 or more carbon atoms. The release sheet composition according to any one of claims 1 to 3, wherein the component (D) is represented by the following formula (1).
[Chemical 3]
^{_{R 1 a H b SiO (4}} -a-b) / 2 (1)
(In the formula, R ¹ is independently an unsubstituted or substituted monovalent hydrocarbon group having 1 to 12 carbon atoms, which is not an alkenyl group, provided that at least 50 mol% of all R ¹ are methyl groups. , A and b are numbers satisfying 0.7≦a≦2.1, 0.001≦b≦1.0, and 0.8≦a+b≦3.0). The release agent composition according to any one of claims 1 to 4, which has a viscosity at 25°C of 50 to 500 mPa·s. The release agent composition according to any one of claims 1 to 5, containing no solvent. A release sheet comprising a sheet-like base material and a cured film formed by curing the release agent composition according to any one of claims 1 to 6 on one surface or both surfaces of the base material surface. A polyester adhesive tape having a width of 50 mm is attached to the cured film, which has an angle of 180°, a low speed peeling force of 0.3 N/50 mm or more measured at a peeling speed of 0.3 m/min, and an angle of 180°, The release sheet according to claim 7, which has a high-speed release force of 0.5 N/50 mm or more measured at a release rate of 50 m/min. The release sheet according to claim 7 or 8, wherein the difference between the low speed peeling force and the high speed peeling force according to claim 8 is 0.3 N/50 mm or less.