JP2010043198A - Silicone rubber blend composition and lipstick-molding mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a silicone rubber composition which can be used as a mold for molding an elastomer for a rod lipstick, etc., particularly can provide the surface of a lipstick with a glossy feeling that a fluorosilicone rubber used is hard to give, and can compensate for a drawback in oil resistance that is a problem when dimethylsilicone rubber is used, and further is excellent in both oil resistance and release performance, because the mold must have excellent release performance to mold a rod lipstick provided with the glossy feeling. <P>SOLUTION: The silicone rubber composition is prepared by blending a dimethylsilicone rubber composition and a fluorosilicone rubber composition in a specific ratio, wherein the dimethylsilicone rubber composition uses a filler which has a surface activity degree of a predetermined upper limit; and the fluorosilicone rubber composition uses a filler which also has a surface activity degree of a predetermined upper limit. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a silicone rubber blend composition excellent in oil resistance and releasability, which is suitable for a mold material for molding rod-like lipsticks mainly composed of oils and fats, waxes or mixtures thereof, and is obtained by curing and molding the composition. The present invention relates to a lipstick mold.

  Conventionally, metal molds have been widely used as means for producing various molded products, but in recent years, molds made of elastomers typified by natural rubber, chloroprene rubber, and silicone rubber have been used. A method of molding is known. This method of using a mold made of an elastomer is used for molding chocolate, kamaboko and jelly, and is also used for solidifying cosmetics such as stick-shaped lipstick and stick-shaped lip balm.

  As a method of molding rod-shaped lipsticks mainly composed of fats, waxes, or a mixture thereof, the mold is made into a capsule form made of plastic typified by polystyrene, and the lipstick components dissolved therein are poured into it and cooled to form. The way to do it is the current mainstream. However, with this method, it is not possible to create added value by design, such as putting a product name or company name on the lipstick surface. The problem of designability can be solved by using a mold instead of plastic, but labor is required to design the mold, and cost disadvantages are likely to occur in the case of small-scale production. In addition, by using an elastomer typified by natural rubber, chloroprene rubber, or fluorosilicone rubber, it is possible to perform molding more advantageously than a mold while maintaining design properties. In particular, since fluorosilicone rubber is excellent in oil resistance, it is difficult to expand during repeated use and hardly changes in shape.

  However, even when a fluorosilicone rubber as disclosed in JP 2000-290139 A (Patent Document 1) is used, if the wax content in the lipstick component is increased, the releasability from the mold is deteriorated and the surface is scratched. It may stick or lose its glossiness, limiting the prescription that can be produced. In addition, as shown in Japanese Patent Application Laid-Open No. 2001-038740 (Patent Document 2), in the case of an elastomer having a silicone-modified fluorinated polyether skeleton, there is a limitation on the formulation that can be produced in the same manner as fluorosilicone rubber. Particularly in recent years, stick-shaped lipsticks tend to be preferred to have a soft touch, and there has been no elastomer material suitable for a mold for molding them. In Japanese Patent Application Laid-Open No. 2007-130844 (Patent Document 3), an elastomer material excellent in glossiness can be obtained. However, since the polymer is dimethyl silicone rubber and lacks oil resistance, it expands during repeated use and has a shape. One of the disadvantages is that it easily changes.

JP 2000-290139 A JP 2001-038740 A JP 2007-130844 A

  The present invention has been made in view of the above circumstances, and can be used as an elastomer mold such as a stick-shaped lipstick, particularly when glossy lipstick surface is difficult to obtain when using fluorosilicone rubber, or when using dimethyl silicone rubber Silicone rubber composition that can compensate for the disadvantages of oil resistance that is a problem, and that glossiness must be excellent in releasability when molding rod-shaped lipsticks, and is excellent in both oil resistance and releasability The purpose is to provide.

  In order to achieve the above purpose, it is possible to simply blend fluorosilicone and dimethylsilicone, or use a copolymer of fluorosilicone and dimethylsilicone, but prepare and blend any fluorosilicone and dimethylsilicone. However, a composition having both oil resistance and releasability cannot be obtained. Since oil resistance is determined by the blend ratio of fluorosilicone and dimethylsilicone, oil resistance can be obtained by increasing the ratio of fluorosilicone, but releasability does not follow.

  As a result of earnest research, the inventor blended a dimethyl silicone rubber composition and a fluorosilicone rubber composition in a specific ratio, and further set an upper limit on the degree of surface activity of the filler used in the dimethyl silicone rubber composition. It was found that the above-mentioned object can be achieved by using a material having an upper limit for the surface activity of the filler used in the fluorosilicone rubber composition.

That is, a reinforcing silica powder having a specific surface area (BET method) of 20 to 220 m ² / g is used as a filler in the dimethyl silicone rubber composition, and the compounding amount of the reinforcing silica powder in the dimethyl silicone rubber composition is 30. Mass% or less and the following formula (2):
Reinforcing silica powder specific surface area (m ² / g) × reinforcing silica powder mass ratio ≦ 40 (2)
(Here, the mass ratio of reinforcing silica powder is the mass ratio of (A-2) reinforcing silica powder to the total mass of component (A).)
Reinforcement with a specific surface area (BET method) of 20 to 220 m ² / g as a filler in the composition (A) in which the active sites and silanol groups are relatively reduced so as to satisfy the above conditions and the fluorosilicone rubber composition The amount of the reinforcing silica powder in the fluorosilicone rubber composition is 15% by mass or less, and the following formula (4):
Reinforcing silica powder specific surface area (m ² / g) × reinforcing silica powder mass ratio ≦ 30 (4)
(Here, the mass ratio of reinforcing silica powder is the mass ratio of (B-2) reinforcing silica powder to the total mass of component (B).)
By using the composition (B) in which the active sites and silanol groups are relatively reduced so as to satisfy the above condition, the active sites by the filler in each silicone rubber composition, that is, the silanol groups are relatively reduced. By blending them in the range of 83 to 95 parts by mass of the fluorosilicone rubber composition with respect to 100 parts by mass of the whole composition, they were excellent in oil resistance and excellent in releasability. For example, the present inventors have found that it becomes a silicone rubber blend composition that can provide a mold having a glossiness when molding lipstick.

  Specific surface area (BET method) and reinforcing silica powder mass ratio (that is, compositions of (A) and (B), respectively, which are indicative of the amount of silica activity, as shown in formulas (2) and (4) In this specification, the numerical value obtained by the product of the mass ratio of the reinforcing filler to the total mass of the base polymer and the reinforcing silica filler is expressed as “silica index”. This silica index is not general and is a means for supplementary explanation of the present invention.

（式中、Ｒ⁴は炭素数２〜８の一価脂肪族不飽和炭化水素基、炭素数１〜８の非置換の一価脂肪族飽和炭化水素基、炭素数６〜１０の芳香族炭化水素基又は水酸基を示し、ｘは０、１又は２、ｐ，ｑ，ｒは互いに独立な正の整数である。）
で示される、２５℃における粘度が２，０００ｍＰａ・ｓ以下であるオルガノポリシロキサン：０．０５〜２質量部
（但し、（Ａ）〜（Ｃ）成分の合計は１００質量部である。）
〔請求項２〕
（Ｃ）成分が、下記式（６）で示される分岐構造のオルガノポリシロキサンである請求項１記載のシリコーンゴムブレンド組成物。

（ただし、式中のｘ’は０又は１であり、Ｒ⁴、ｐ，ｑ，ｒは前記と同じである。）
〔請求項３〕
（Ａ）成分のシリコーンゴム組成物に、更に、（Ａ−３）２５℃における粘度が３０〜５００ｍＰａ・ｓの範囲にある非反応性シリコーンオイルを含有してなる請求項１又は２記載のシリコーンゴムブレンド組成物。
〔請求項４〕
（Ａ−３）成分の配合量が、（Ａ−１）成分１００質量部に対し１〜１２質量部である請求項３記載のシリコーンゴムブレンド組成物。
〔請求項５〕
更に、硬化剤を配合してなる請求項１〜４のいずれか１項記載のシリコーンゴムブレンド組成物。
〔請求項６〕
硬化後の硬度（デュロメータータイプＡ）が２０〜４０である請求項１〜５のいずれか１項に記載のシリコーンゴムブレンド組成物。
〔請求項７〕
棒状口紅成型用である請求項１〜６のいずれか１項記載のシリコーンゴムブレンド組成物。
〔請求項８〕
請求項１〜７のいずれか１項記載のシリコーンゴムブレンド組成物を硬化成型してなる棒状口紅用の成型型。 Accordingly, the present invention provides the following silicone rubber blend composition and a mold for lipstick obtained by curing and molding the composition.
[Claim 1]
A silicone rubber blend composition containing the following components (A) to (C) as essential components.
(A) (A-1) an organopolysiloxane having an average degree of polymerization of 100 to 10,000 represented by the following average composition formula (1):
_{R n SiO (4-n)} / 2 ... (1)
(In the formula, R is the same or different unsubstituted monovalent hydrocarbon group or hydroxyl group, and at least two of all R groups in one molecule are aliphatic unsaturated groups. N is 1.95 to (It is a positive number of 2.05.)
(A-2) Reinforcing silica powder having a specific surface area (BET method) of 20 to 220 m ² / g: an amount of 30% by mass or less in the component (A) and satisfying the condition of the following formula (2),
Reinforcing silica powder specific surface area (m ² / g) × reinforcing silica powder mass ratio ≦ 40 (2)
(Here, the mass ratio of reinforcing silica powder is the mass ratio of (A-2) reinforcing silica powder to the total mass of component (A-1) and component (A-2).)
Silicone rubber composition comprising: 3 to 15 parts by mass,
(B) (B-1) an organopolysiloxane having an average polymerization degree of 1,000 to 7,000 represented by the following average composition formula (3):
R ¹ _a R ² _b R ³ _c SiO _{(4-abc) / 2} (3)
(Wherein R ¹ is a trifluoropropyl group, R ² is a monovalent aliphatic unsaturated hydrocarbon group or hydroxyl group having 2 to 8 carbon atoms, and R ³ is an unsubstituted monovalent aliphatic saturated group having 1 to 8 carbon atoms. A hydrocarbon group or an aromatic hydrocarbon group having 6 to 10 carbon atoms, wherein a, b and c are 0.96 ≦ a ≦ 1.01, 0.0001 ≦ b ≦ 0.01, 0.96 ≦ c ≦ 1.06, 1.98 ≦ a + b + c ≦ 2.02.
(B-2) Reinforcing silica powder having a specific surface area (BET method) of 20 to 220 m ² / g: 15% by mass or less in the component (B) and an amount satisfying the following formula (4):
Reinforcing silica powder specific surface area (m ² / g) × reinforcing silica powder mass ratio ≦ 30 (4)
(Here, the mass ratio of reinforcing silica powder is the mass ratio of (B-2) reinforcing silica powder to the total mass of component (B-1) and component (B-2).)
Fluorosilicone rubber composition comprising: 83 to 95 parts by mass,
(C) The following general formula (5)

(In the formula, R ⁴ is a monovalent aliphatic unsaturated hydrocarbon group having 2 to 8 carbon atoms, an unsubstituted monovalent aliphatic saturated hydrocarbon group having 1 to 8 carbon atoms, or an aromatic carbon atom having 6 to 10 carbon atoms. And represents a hydrogen group or a hydroxyl group, x is 0, 1 or 2, and p, q, and r are positive integers independent of each other.
An organopolysiloxane having a viscosity at 25 ° C. of 2,000 mPa · s or less represented by 0.05 to 2 parts by mass
(However, the total of components (A) to (C) is 100 parts by mass.)
[Claim 2]
The silicone rubber blend composition according to claim 1, wherein the component (C) is an organopolysiloxane having a branched structure represented by the following formula (6).

(However, x ′ in the formula is 0 or 1, and R ⁴ , p, q, and r are the same as above.)
[Claim 3]
The silicone according to claim 1 or 2, wherein the silicone rubber composition of component (A) further comprises (A-3) a non-reactive silicone oil having a viscosity at 25 ° C in the range of 30 to 500 mPa · s. Rubber blend composition.
[Claim 4]
The silicone rubber blend composition according to claim 3, wherein the amount of the component (A-3) is 1 to 12 parts by mass with respect to 100 parts by mass of the component (A-1).
[Claim 5]
Furthermore, the silicone rubber blend composition of any one of Claims 1-4 formed by mix | blending a hardening | curing agent.
[Claim 6]
The silicone rubber blend composition according to any one of claims 1 to 5, wherein the hardness after curing (durometer type A) is 20 to 40.
[Claim 7]
The silicone rubber blend composition according to any one of claims 1 to 6, which is used for molding a stick-shaped lipstick.
[Claim 8]
A molding die for a stick-shaped lipstick obtained by curing and molding the silicone rubber blend composition according to any one of claims 1 to 7.

  The silicone rubber blend composition of the present invention provides a cured product excellent in oil resistance and releasability, and particularly a stick-shaped lipstick mainly composed of oils, waxes, or mixtures thereof that require oil resistance and releasability. It is suitable as a molding material.

Hereinafter, the present invention will be described in more detail. The silicone rubber blend composition of the present invention comprises the following components (A) to (C).
[Component (A)]
(A-1) an organopolysiloxane having an average degree of polymerization of 100 to 10,000 represented by the following average composition formula (1):
R _n SiO _{(4-n) / 2} (1)
(In the formula, R is the same or different unsubstituted monovalent hydrocarbon group or hydroxyl group, and at least two of all R groups in one molecule are aliphatic unsaturated groups. N is 1.95 to (It is a positive number of 2.05.)
(A-2) Reinforcing silica powder having a specific surface area (BET method) of 20 to 220 m ² / g,
Preferably, (A-3) a silicone rubber composition comprising a non-reactive silicone oil having a viscosity at 25 ° C. in the range of 30 to 500 mPa · s.

[(B) component]
(B-1) an organopolysiloxane having an average degree of polymerization of 1,000 to 7,000 represented by the following average composition formula (3):
R ¹ _a R ² _b R ³ _c SiO _{(4-abc) / 2} (3)
(Wherein R ¹ is a trifluoropropyl group, R ² is a monovalent aliphatic unsaturated hydrocarbon group or hydroxyl group having 2 to 8 carbon atoms, and R ³ is an unsubstituted monovalent aliphatic saturated group having 1 to 8 carbon atoms. A hydrocarbon group or an aromatic hydrocarbon group having 6 to 10 carbon atoms, wherein a, b and c are 0.96 ≦ a ≦ 1.01, 0.0001 ≦ b ≦ 0.01, 0.96 ≦ c ≦ 1.06, 1.98 ≦ a + b + c ≦ 2.02.
(B-2) A fluorosilicone rubber composition comprising a reinforcing silica powder having a specific surface area (BET method) of 20 to 220 m ² / g.

（式中、Ｒ⁴は炭素数２〜８の一価脂肪族不飽和炭化水素基、炭素数１〜８の非置換の一価脂肪族飽和炭化水素基、炭素数６〜１０の芳香族炭化水素基又は水酸基を示し、ｘは０、１又は２、ｐ，ｑ，ｒは互いに独立な正の整数である。） [Component (C)]
Organopolysiloxane represented by the following general formula (5) and having a viscosity at 25 ° C. of 2,000 mPa · s or less.

(Wherein, R ⁴ is a monovalent aliphatic unsaturated hydrocarbon group having 2 to 8 carbon atoms, unsubstituted monovalent aliphatic saturated hydrocarbon group having 1 to 8 carbon atoms, an aromatic having 6 to 10 carbon atoms carbide And represents a hydrogen group or a hydroxyl group, x is 0, 1 or 2, and p, q, and r are positive integers independent of each other.

In the silicone rubber composition of the component (A) in the silicone rubber blend composition according to the present invention, the organopolysiloxane as the component (A-1) used as the base polymer (main agent) has the following average composition formula (1): It is shown by.
R _n SiO _{(4-n) / 2} (1)
(In the formula, R is the same or different unsubstituted monovalent hydrocarbon group or hydroxyl group, and at least two of all R groups in one molecule are aliphatic unsaturated groups. N is 1.95 to (It is a positive number of 2.05.)

In the above formula, R is an alkyl group such as a methyl group, an ethyl group, a propyl group or a butyl group, a cycloalkyl group such as a cyclohexyl group, an alkenyl group such as a vinyl group, an allyl group, a butenyl group or a hexenyl group, phenyl The same or different, preferably a monovalent hydrocarbon having 1 to 10 carbon atoms, more preferably 1 to 8 carbon atoms, selected from a group, an aryl group such as a tolyl group, and an aralkyl group such as a benzyl group It is a group. In molded products, the lipstick surface is more glossy, so alkyl groups such as methyl, ethyl, propyl, and butyl groups, cycloalkyl groups such as cyclohexyl groups, vinyl groups, allyl groups, butenyl groups, and hexenyl groups. And an aryl group such as a phenyl group and a tolyl group.
In this case, R must have at least two aliphatic unsaturated groups represented by alkenyl groups in one molecule, but the content of aliphatic unsaturated groups in all R groups is 0. 0.001 to 20 mol%, particularly 0.025 to 10 mol% is desirable. Further, it is preferable that one or two hydroxyl groups are contained in the molecule as silanol groups bonded to the silicon atom at the end of the molecular chain, and all of the R groups excluding the aliphatic unsaturated groups and hydroxyl groups are methyl groups, etc. An alkyl group is preferred.

  N is a positive number of 1.95 to 2.05, preferably 1.98 to 2.01, and more preferably 1.99 to 2.002.

  In the organopolysiloxane represented by the above formula (1), the main chain is basically composed of repeating diorganosiloxane units, and both ends of the molecular chain are blocked with triorganosiloxy groups or hydroxyl groups (diorganohydroxysiloxy groups). However, it may be a single type or a mixture of two or more types having different molecular structures or polymerization degrees. The bonding position of the aliphatic unsaturated group may be at the end of the molecular chain, at the side chain, or at both.

  Furthermore, the above-mentioned organopolysiloxane has an average degree of polymerization of 100 to 10,000, particularly 1,000 to 8,000, more preferably about 2,000 to 8,000, in particular raw rubber having no self-fluidity at 25 ° C. It is preferable that it is an organopolysiloxane. If the average degree of polymerization is too small or too large, workability (handleability) as a composition becomes difficult. In addition, an average degree of polymerization can be normally calculated | required as a weight average molecular weight of polystyrene conversion in a gel permeation chromatography (GPC) analysis.

(A-2) Reinforcing silica powder is blended with the silicone rubber composition of component (A). The reinforcing silica powder is necessary for obtaining a rubber composition having excellent mechanical strength. For this purpose, the specific surface area according to the BET method needs to be in the range of ²⁰ to 220 m ² / g, Preferably it is the range of 40-200 m < ² > / g. If the specific surface area is too small, a sufficient reinforcing (improving) effect cannot be obtained with respect to the strength of the cured product, and if it is too large, the releasability when formed into a molded product is inferior.

Examples of the reinforcing silica powder include fumed silica (dry silica) and precipitated silica (wet silica), and fumed silica (dry silica) is preferable. Examples of commercially available reinforcing silicas include Aerosil 130 (BET specific surface area 130 m ² / g), 200 (BET specific surface area 200 m ² / g) (trade name, manufactured by Nippon Aerosil Co., Ltd.), Cab-O—. sil MS-5, MS-7, HS-5, HS-7 (trade name, manufactured by Cabot), Santocel FRC, CS (trade name, manufactured by Monsanto), Nipsil VN-3LP (BET specific surface area 200 m ² / g) (Tosoh) Silica Co., Ltd. product name).

  Further, these surfaces may be hydrophobized with organopolysiloxane, organopolysilazane, chlorosilane, organohydrogenpolysiloxane, alkoxysilane or the like. These silicas may be used alone or in combination of two or more.

  The amount of the reinforcing silica powder (A-2) added is 30% by mass or less (usually 3 to 30% by mass, particularly 5 to 25% by mass) in the component (A). 1) It is 5-30 mass parts per 100 mass parts of organopolysiloxane of a component, Preferably it is the range of 5-25 mass parts. If the addition amount is too small, the strength when the rubber composition is cured is insufficient, and the hardness is less than 20 degrees, so that the handling at the time of molding becomes inconvenient. If the addition amount is too large, the object of the present invention is Therefore, the releasability with respect to the stick-shaped lipstick whose main component is oil or fat, wax, or a mixture thereof is impaired.

In the present invention, it is necessary that the amount further satisfies the condition of the following formula (2).
Reinforcing silica powder specific surface area (m ² / g) × reinforcing silica powder mass ratio ≦ 40 (preferably 36) (2)
(Here, the mass ratio of reinforcing silica powder refers to the total mass of the component (A) (that is, the total mass of the component (A-1) and the component (A-2)) as a, and the mass of the silica powder as a. -2 is the mass ratio (a-2) / a of (A-2) reinforcing silica powder to the total mass of component (A).)

In the present invention, the amount of reinforcing silica powder varies with the specific surface area of the silica to be blended. For example, in the case of Aerosil 200 (that is, dry silica powder having a specific surface area (BET method) of 200 m ² / g), the reinforcing silica powder content in the silicone rubber composition of component (A) is the reinforcing silica powder. Substituting the specific surface area value (m ² / g) for equation (2),
200 × [mass ratio of reinforcing silica powder] ≦ 40
[Mass ratio of reinforcing silica powder] ≦ 0.200
Therefore, the amount of reinforcing silica powder in the sum of the components (A-1) and (A-2) is derived to be 20.0% by mass or less. When this is converted into the amount of 100 parts by weight of the organopolysiloxane of component (A-1), it becomes 25 parts by weight or less.

Similarly, when dry silica having a specific surface area of 80 m ² / g is used, the maximum amount of silica that can be added to 100 parts by mass of the organopolysiloxane of component (A-1) that can be derived from the formula (2) is 53.8 parts by mass (( A) 35% by mass in the component), but in order to maintain the releasability for the rod-shaped lipstick when formed into a molded product, 43 parts by mass or less with respect to 100 parts by mass of the organopolysiloxane of the component (A-1). (That is, 30% by mass or less in the component (A)). When the amount is more than 43 parts by mass (that is, 30% by mass), the releasability to a rod-like lipstick whose main component is oils, waxes, or mixtures thereof is the object of the present invention regardless of the specific surface area of silica. This is because of loss.

(A) The silicone rubber composition of component (A-3) is a non-reactive silicone oil (that is, a non-functional silicone containing no functional groups such as silicon-bonded alkenyl groups and SiH groups) Oil) can be blended for the purpose of improving releasability. Examples of the non-reactive silicone oil include dimethylsiloxane oil (that is, dimethylpolysiloxane blocked with trimethylsiloxy groups at both molecular chain ends).
In general, it is known to add an appropriate amount of phenyl silicone oil to dimethyl silicone rubber for use as an oil bleed. However, when phenyl silicone oil is added in the present invention, the amount of bleed to the rubber molding is excessively increased, and the gloss of the lipstick surface during lipstick molding is lost, which is not preferable.

  The viscosity at 25 ° C. of the dimethylsiloxane oil is preferably 30 to 500 mPa · s, and more preferably 50 to 300 mPa · s. If it is less than 30 mPa · s, the reinforcing property of the resulting silicone rubber blend composition is impaired, and a soft molded product may be formed. In addition, if it exceeds 500 mPa · s, the surface tackiness of the rubber compound or rubber molding may increase, resulting in inconvenience in handling during molding, or the gloss of the lipstick surface during lipstick molding may be lost. . In the present invention, the viscosity can be measured with a rotational viscometer (hereinafter the same).

  The addition amount of the non-reactive silicone oil is 0 to 12 parts by mass with respect to 100 parts by mass of the organopolysiloxane of the component (A-1). Part is more preferred. If it is less than 1 part by mass, the effect is uncertain, and if it exceeds 12 parts by mass, the surface tackiness of the rubber compound or rubber molding increases, making it difficult to handle during molding, and the surface of the lipstick when molding lipstick. The gloss may be lost.

  The silicone rubber composition of component (A) is prepared by uniformly mixing the above components according to a conventional method using a rubber kneader such as a two roll, Banbury mixer, or dough mixer (kneader). Can be prepared.

On the other hand, in the fluorosilicone rubber composition as the component (B) in the silicone rubber blend composition according to the present invention, the organopolysiloxane as the component (B-1) used as the base polymer (main agent) has the following average composition formula: It is shown by (3).
R ¹ _a R ² _b R ³ _c SiO _{(4-abc) / 2} (3)
(Wherein R ¹ is a trifluoropropyl group, R ² is a monovalent aliphatic unsaturated hydrocarbon group or hydroxyl group having 2 to 8 carbon atoms, and R ³ is an unsubstituted monovalent aliphatic saturated group having 1 to 8 carbon atoms. A hydrocarbon group or an aromatic hydrocarbon group having 6 to 10 carbon atoms, wherein a, b and c are 0.96 ≦ a ≦ 1.01, 0.0001 ≦ b ≦ 0.01, 0.96 ≦ c ≦ 1.06, 1.98 ≦ a + b + c ≦ 2.02.

Here, in the above formula, R ² is a monovalent aliphatic unsaturated hydrocarbon group having 2 to 8 carbon atoms, represented by R in the formula (1), include the same as those exemplified as the alkenyl group R ³ is an unsubstituted monovalent aliphatic saturated hydrocarbon group having 1 to 8 carbon atoms or an aromatic hydrocarbon group having 6 to 10 carbon atoms, and among R in the formula (1), an alkenyl group The same thing as what was illustrated as a thing other than can be mentioned.
a, b, c are positive values satisfying 0.96 ≦ a ≦ 1.01, 0.0001 ≦ b ≦ 0.01, 0.96 ≦ c ≦ 1.06, 1.98 ≦ a + b + c ≦ 2.02. A positive number satisfying 0.96 ≦ a ≦ 1.00, 0.0001 ≦ b ≦ 0.005, 0.96 ≦ c ≦ 1.05, 1.99 ≦ a + b + c ≦ 2.01 Is a number.

The trifluoropropyl group-containing organopolysiloxane represented by the above formula (3) basically has a main chain composed of repeating diorganosiloxane units, and both ends of the molecular chain are triorganosiloxy groups or hydroxyl groups (diorganohydroxy). Although it is preferably a linear structure blocked with a siloxy group), it may be one or a mixture of two or more having different molecular structures or polymerization degrees. The bonding position of the aliphatic unsaturated hydrocarbon group of R ² may be at the end of the molecular chain, at the side chain, or at both.

  Furthermore, the trifluoropropyl group-containing organopolysiloxane has an average degree of polymerization calculated as a polystyrene-reduced weight average molecular weight in gel permeation chromatography (GPC) analysis of 1,000 to 7,000, It is preferably a raw rubber-like organopolysiloxane having a self-fluidity of about 500 to 7,000, particularly at 25 ° C.

(B-2) Reinforcing silica powder is blended with the fluorosilicone rubber composition of component (B). The reinforcing silica powder is necessary for obtaining a rubber composition having excellent mechanical strength. For this purpose, the specific surface area according to the BET method needs to be in the range of ²⁰ to 220 m ² / g, Preferably it is the range of 40-200 m < ² > / g. If the specific surface area is too small, a sufficient reinforcing (improving) effect cannot be obtained for the cured product, and if it is too large, the releasability when formed into a molded product is inferior.

  Examples of the reinforcing silica powder are the same as those exemplified for the component (A-2). These silicas may be used alone or in combination of two or more.

  The amount of the reinforcing silica powder (B-2) added is 15% by mass or less (usually 0.5 to 15% by mass, particularly 1 to 14% by mass) in the component (B). -1) It is 1-16 mass parts per 100 mass parts of organopolysiloxane of a component, Preferably it is the range of 2-13 mass parts. If the addition amount is too small, the strength when the rubber composition is cured is insufficient, and the hardness is less than 20 degrees, so that the handling at the time of molding becomes inconvenient. If the addition amount is too large, the object of the present invention is Therefore, the releasability with respect to the stick-shaped lipstick whose main component is oil or fat, wax, or a mixture thereof is impaired.

In the present invention, it is necessary that the amount further satisfies the condition of the following formula (4).
Reinforcing silica powder specific surface area (m ² / g) × reinforcing silica powder mass ratio ≦ 30 (4)
(Here, the mass ratio of reinforcing silica powder refers to the total mass of component (B) (that is, the total mass of component (B-1) and component (B-2)) is b, and the mass of silica powder is b. -2 is the mass ratio (b-2) / b of (B-2) reinforcing silica powder to the total mass of component (B).)

For example, in the case of Aerosil 130 (that is, dry silica powder having a specific surface area (BET method) of 130 m ² / g), the additive amount that can be derived from the formula (4) can be derived when it is 23% by mass or less. When this is converted, it becomes 30 parts by mass or less with respect to 100 parts by mass of the organopolysiloxane of the component (B-1), but in order to maintain the releasability with respect to the rod-shaped lipstick when formed into a molded product, (B -1) It is necessary to make it 17.6 mass parts or less (namely, 15 mass% or less in (B) component) with respect to 100 mass parts of organopolysiloxane of a component. When the amount is more than 17.6 parts by mass (15% by mass), the releasability to the rod-shaped lipstick, which is mainly composed of oils, waxes and mixtures thereof, which is the object of the present invention, is impaired regardless of the specific surface area of silica. Because.

  The fluorosilicone rubber composition of component (B) is prepared by uniformly mixing the above components according to a conventional method using a rubber kneader such as a two roll, Banbury mixer, or dough mixer (kneader). Can be prepared.

  The silicone rubber blend composition according to the present invention contains an organopolysiloxane represented by the following general formula (5) as the component (C). When the silicone rubber composition of component (A) and the fluorosilicone rubber composition of component (B) are simply blended with two rolls or the like, delamination is likely to occur in the molded product. Siloxane is used as a compatibilizer.

（式中、Ｒ⁴は炭素数２〜８の一価脂肪族不飽和炭化水素基、炭素数１〜８の非置換の一価脂肪族飽和炭化水素基、炭素数６〜１０の芳香族炭化水素基又は水酸基を示し、ｘは０、１又は２、ｐ，ｑ，ｒは互いに独立な正の整数である。）

(In the formula, R ⁴ is a monovalent aliphatic unsaturated hydrocarbon group having 2 to 8 carbon atoms, an unsubstituted monovalent aliphatic saturated hydrocarbon group having 1 to 8 carbon atoms, or an aromatic carbon atom having 6 to 10 carbon atoms. And represents a hydrogen group or a hydroxyl group, x is 0, 1 or 2, and p, q, and r are positive integers independent of each other.

Here, in the above formula, R ⁴ is a monovalent aliphatic unsaturated hydrocarbon group having 2 to 8 carbon atoms, an unsubstituted monovalent aliphatic saturated hydrocarbon group having 1 to 8 carbon atoms, or 6 to 6 carbon atoms. Examples of the monovalent aliphatic unsaturated hydrocarbon group having 2 to 8 carbon atoms, which are 10 aromatic hydrocarbon groups or hydroxyl groups, include the same as those described above for R ^2. Examples of the substituted monovalent aliphatic saturated hydrocarbon group and the aromatic hydrocarbon group having 6 to 10 carbon atoms are the same as those described above for R ³ .
x is 0, 1 or 2, preferably 0 or 1. p, q, and r are mutually independent positive integers, preferably q is 1 to 50, r is 1 to 50, p is 1 to 10, more preferably q is 4 to 30, r is 2 to 30, and p is It is an integer of 1 to 5, and preferably, the (CH ₃ ) ₂ SiO _2/2 unit and the (CH ₃ ) (CF ₃ CH ₂ CH ₂ ) SiO _2/2 unit are each the number of repetitions of q and r. Within the range of, exists in the block.

  The organopolysiloxane represented by the general formula (5) has a viscosity at 25 ° C. of 2,000 mPa · s or less, preferably 5 to 2,000 mPa · s, more preferably 10 to 1,000 mPa · s. If the viscosity is too high or too low, it may be incorporated into the composition and may not exhibit a sufficient effect for suppressing delamination.

x is 0, 1 or 2, however, from the viewpoint of delamination suppression, the organopolysiloxane represented by the general formula (5) preferably has a branched structure. From this point, x is 0 or 1. preferable. In addition, when x = 0, R ⁴ _x SiO _{(4-x) / 2} becomes a SiO ₂ unit (Q unit), and when x = 1, it becomes a R ⁴ SiO _3/2 unit (T unit). .

  The blending ratio of the silicone rubber composition of component (A) typified by the dimethyl silicone rubber composition and the fluorosilicone rubber composition of component (B) is oil resistance, that is, a stick-shaped lipstick using a mold. From the viewpoint of preventing a change in shape due to swelling when molding, it is necessary to make the ratio of fluorosilicone relatively high. The ratio is preferably in the range of dimethyl silicone rubber composition (component (A)): fluorosilicone rubber composition (component (B)) = 3-15: 83-95 (parts by mass). More preferably, the range of dimethyl silicone rubber composition (component (A)): fluorosilicone rubber composition (component (B)) = 6 to 12:86 to 92 (parts by mass) is preferable. When the ratio of the component (B) is less than 83 parts by mass, the oil resistance decreases, and when it is greater than 95 parts by mass, there is a high possibility that handling during molding is inconvenient due to the sticky feeling derived from the fluorosilicone polymer. .

  The amount of component (C) is 0 with respect to a total of 100 parts by weight of the silicone rubber composition of component (A), the fluorosilicone rubber composition of component (B), and the compatibilizer of component (C). A range of 0.05 to 2 parts by mass is preferred. More preferably, the range of 0.5-2 mass parts is preferable. If the amount is less than 0.05 parts by mass, the delamination effect is not exerted, and if it is 2 parts by mass, the effect can be sufficiently exerted. Therefore, addition beyond that is disadvantageous in terms of cost and does not make much sense.

  The silicone rubber blend composition of the present invention can further contain a curing agent. The curing agent is not particularly limited as long as it can cure the component (A) and the component (B), but is generally known as a curing agent for a silicone rubber composition. A combination of a catalyst and an organohydrogenpolysiloxane (crosslinking agent) can be used. An organic peroxide catalyst is more preferable for exhibiting releasability.

Examples of the organic peroxide catalyst include benzoyl peroxide, 2,4-dichlorobenzoyl peroxide, p-methylbenzoyl peroxide, 2,4-dicumyl peroxide, 2,5-dimethyl-bis (2,5- (t-butylperoxy) hexane, di-t-butyl peroxide, t-butyl perbenzoate and the like.
The amount of the organic peroxide catalyst added is preferably 0.1 to 5 parts by mass, more preferably 0.2 to 100 parts by mass in total of the components (A-1) and (B-1). ~ 3 parts by mass.

Also, known catalysts can be used as platinum-based catalysts. Specifically, platinum elements alone, platinum compounds, platinum complexes, chloroplatinic acid, chloroplatinic acid alcohol compounds, aldehyde compounds, ether compounds, and various olefins. Examples include complexes.
The amount of platinum-based catalyst added is usually preferably in the range of 1 to 2,000 ppm in terms of platinum atom mass with respect to a total of 100 parts by mass of component (A-1) and component (B-1).

  The molecular structure of the organohydrogenpolysiloxane as a crosslinking agent is not particularly limited, and various types such as linear, cyclic, branched, and three-dimensional network structures (resinous) can be used. It is necessary to have at least 2, preferably 3 or more hydrogen atoms bonded to silicon atoms (hydrosilyl group represented by SiH) in the molecule, usually 2 to 300, preferably 3 to 200, and more. Preferably, it has about 4 to 100 SiH groups. The SiH group contained in at least 2, preferably 3 or more in one molecule may be located either at the molecular chain end or in the middle of the molecular chain, or may be located at both. In addition, the organohydrogenpolysiloxane has a number of silicon atoms in one molecule (or a polymerization degree) of usually 2 to 300, preferably from the viewpoint of physical properties of the resulting silicone rubber and handling workability of the composition. The number is preferably 3 to 200, more preferably about 4 to 100, and the viscosity at 25 ° C. is usually 0.1 to 1,000 mPa · s, preferably 0.5 to 500 mPa · s, more preferably 5 to 5 A liquid of about 300 mPa · s is used.

Specific examples of the organohydrogenpolysiloxane include 1,1,3,3-tetramethyldisiloxane, 1,3,5,7-tetramethylcyclotetrasiloxane, tris (dimethylhydrogensiloxy) methylsilane, Tris (dimethylhydrogensiloxy) phenylsilane, methylhydrogencyclopolysiloxane, methylhydrogensiloxane / dimethylsiloxane cyclic copolymer, trimethylsiloxy group-blocked methylhydrogenpolysiloxane at both ends, trimethylsiloxy group-blocked dimethylsiloxane at both ends Methyl hydrogen siloxane copolymer, both ends dimethyl hydrogen siloxy group-capped dimethyl polysiloxane, both ends dimethyl hydrogen siloxy group capped methyl hydrogen policy Xanthone, both ends dimethylhydrogensiloxy group-blocked dimethylsiloxane / methylhydrogensiloxane copolymer, both ends trimethylsiloxy group-blocked methylhydrogensiloxane / diphenylsiloxane copolymer, both ends trimethylsiloxy group-blocked methylhydrogensiloxane / diphenyl Siloxane / dimethylsiloxane copolymer, both ends trimethylsiloxy group-capped methylhydrogensiloxane / methylphenylsiloxane / dimethylsiloxane copolymer, both end dimethylhydrogensiloxy group-capped methylhydrogensiloxane / dimethylsiloxane / diphenylsiloxane copolymer , Dimethylhydrogensiloxy group-blocked methylhydrogensiloxane, dimethylsiloxane, methylphenyl Hexane copolymer, (CH _{3) 2} HSiO _1/2 units and (CH _{3) 3} SiO _1/2 units and SiO _4/2 units, copolymers composed of the (CH _{3) 2} HSiO _1/2 units copolymers comprising SiO _4/2 units, (CH _{3) 2} HSiO _1/2 units and SiO _4/2 units and (C ₆ H ₅₎ consisting of SiO _3/2 units, copolymers composed of 1-propyl -3,5,7-trihydrogen-1,3,5,7-tetramethylcyclotetrasiloxane, 1,5-dihydrogen-3,7-dihexyl-1,3,5,7-tetramethylcyclo Examples include tetrasiloxane.

  The amount of the organohydrogenpolysiloxane added is a hydrogen atom directly connected to a silicon atom (hydrosilyl group represented by SiH) with respect to the total of silicon atom-bonded alkenyl groups of the components (A-1) and (B-1). Is preferably used in a proportion of 50 to 500 mol%, particularly 100 to 400 mol%.

  If necessary, it is optional to add various additives such as a colorant and a heat resistance improver, a reaction control agent, a mold release agent, a dispersant for a filler, and the like to the composition of the present invention. Examples of the dispersant for the filler include silanol group-containing organosilanes such as diphenylsilanediol, (organo) alkoxysilanes such as dimethyldimethoxysilane, methyltrimethoxysilane, trimethylmethoxysilane, and tetramethoxysilane, and hexamethyldisiloxane. , Organosilazanes such as hexamethyldisilazane, functional group-containing alkoxysilanes such as carbon functional silane, dimethylsiloxane oligomers blocked at both ends with silanol groups (polymerization degree 2 to 20), methylhydroxysiloxane oligomers blocked at both ends methoxy groups Sila such as (degree of polymerization 2-20) Among these dispersants for fillers, diphenylsilanediol, various alkoxysilanes, carbon functional silanes, silanol group-containing low molecular siloxanes, etc. impair the effects of the present invention. It is preferable to keep the addition amount to a minimum so that there is no possibility.

  In addition, it is preferable to mix | blend the said dispersing agent in the composition of the (A) component and (B) component mentioned above. (A) When mix | blending with a component, it is preferable to mix | blend in the range of 0.1-8 mass parts with respect to 100 mass parts of (A-1) organopolysiloxane of a component, especially 0.5-5 mass parts, Moreover, when mix | blending with (B) component, it is preferable to mix | blend in 0.1-5 mass parts with respect to 100 mass parts of organopolysiloxane of (B-1) component, especially 0.5-4 mass parts. .

  The silicone rubber blend composition according to the present invention comprises the above-described components (that is, (A) component, (B) component, (C) component and optional component) mixed in advance in advance, two rolls, Banbury mixer, It can be obtained by uniformly mixing using a rubber kneader such as a dough mixer (kneader) and subjecting to heat treatment as necessary.

The silicone rubber blend composition obtained in this way can be molded for uses required by various molding methods such as mold pressure molding and injection molding.
The molded silicone rubber preferably has a hardness (durometer type A) of 20 to 40 after curing. If it is less than 20, the mechanical strength is insufficient, and there is a possibility that molding cannot be performed well during mold molding. Moreover, when it exceeds 40, since it becomes easy to cause the fall of the mold release property by the active site by a filler increasing, the material which does not meet the objective of this invention may be obtained. Furthermore, it is more preferable that the hardness after curing (durometer type A) is 20 to 30 from the viewpoint of releasability.

  EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated concretely, this invention is not restrict | limited to the following Example.

[Examples 1 to 3, Comparative Examples 1 to 12]
First, the following rubber compounds were produced.
Compound I-1 (dimethylsilicone composition)
The diorganosiloxane unit constituting the main chain is mainly composed of a dimethylsiloxane unit, and this is composed of a methylvinylsiloxane unit (the amount of vinyl derived from the methylvinylsiloxane unit relative to the silicon atom in the molecule is about 0.20 mol%), 100 parts by mass of a raw rubber-like organopolysiloxane blocked with trimethylsiloxy groups at both ends of the molecular chain having an average degree of polymerization of about 5,000, 5 parts by mass of a silanol group-containing dimethylpolysiloxane (average degree of polymerization 10) as a dispersant, a filler As a compound, 23 parts by mass of dry silica [trade name Aerosil 200, BET specific surface area 200 m ² / g, manufactured by Nippon Aerosil Co., Ltd.] was added and heat-treated for 2 hours to prepare Compound A.

Compound I-2 (dimethylsilicone composition)
To 100 parts by mass of Compound A, 8 parts by mass of dimethylsiloxane oil having an average viscosity of 10 mPa · s (namely, trimethylsiloxy group-blocked dimethylpolysiloxane having molecular chains at both ends, the same applies hereinafter) was added by two rolls.

Compound I-3 (dimethylsilicone composition)
To 100 parts by mass of Compound A, 8 parts by mass of dimethylsiloxane oil having an average viscosity of 100 mPa · s was added by two rolls.

Compound I-4 (dimethylsilicone composition)
To 100 parts by mass of Compound A, 8 parts by mass of dimethylsiloxane oil having an average viscosity of 1,000 mPa · s was added by two rolls.

Compound II-1 (dimethylsilicone composition)
The diorganosiloxane unit constituting the main chain is mainly composed of a dimethylsiloxane unit, and this is composed of a methylvinylsiloxane unit (the amount of vinyl derived from the methylvinylsiloxane unit relative to the silicon atom in the molecule is about 0.15 mol%), 100 parts by weight of raw rubber-like organopolysiloxane blocked with trimethylsiloxy groups at both ends of the molecular chain having an average degree of polymerization of about 5,000, 7 parts by weight of silanol group-containing dimethylpolysiloxane (average degree of polymerization 10) as a dispersant, filler As a compound, 35 parts by mass of dry silica [trade name Aerosil 200, BET specific surface area 200 m ² / g, manufactured by Nippon Aerosil Co., Ltd.] was added and heat treated for 2 hours to prepare Compound B.

Compound II-2 (dimethylsilicone composition)
To 100 parts by mass of Compound B, 8 parts by mass of dimethylsiloxane oil having an average viscosity of 100 mPa · s was added by two rolls.

Compound III (fluorosilicone composition)
The diorganosiloxane unit constituting the main chain is mainly a trifluoropropylmethylsiloxane unit, and this and a methylvinylsiloxane unit (the amount of vinyl derived from the methylvinylsiloxane unit relative to the silicon atom in the molecule is about 0.15 mol%), And 100 parts by mass of a raw rubber-like organopolysiloxane having both ends of the molecular chain with an average polymerization degree of about 3,000 blocked with silanol groups, and a silanol group-containing trifluoropropylmethylpolysiloxane (average polymerization degree) as a dispersant. 10) 4 parts by mass and 16 parts by mass of dry silica [trade name Aerosil 200, BET specific surface area 200 m ² / g, manufactured by Nippon Aerosil Co., Ltd.] as a filler were added and heat treated for 3 hours to make Compound C.

Compound IV (Fluorosilicone composition)
The diorganosiloxane unit constituting the main chain is mainly a trifluoropropylmethylsiloxane unit, and this and a methylvinylsiloxane unit (the amount of vinyl derived from the methylvinylsiloxane unit relative to the silicon atom in the molecule is about 0.15 mol%), And 100 parts by mass of a raw rubber-like organopolysiloxane having both ends of the molecular chain with an average polymerization degree of about 3,000 blocked with silanol groups, and a silanol group-containing trifluoropropylmethylpolysiloxane (average polymerization degree) as a dispersant. 15) 5 parts by mass and 20 parts by mass of dry silica [trade name Aerosil 200, BET specific surface area 200 m ² / g, manufactured by Nippon Aerosil Co., Ltd.] as a filler were added and heat treated for 3 hours to prepare Compound D.

Compound V (Fluorosilicone composition)
The diorganosiloxane unit that constitutes the main chain is mainly composed of trifluoropropylmethylsiloxane unit and methylvinylsiloxane unit (the amount of vinyl derived from vinylsiloxane with respect to silicon atom in the molecule is about 0.30 mol%). 100 parts by mass of raw rubber-like organopolysiloxane having both ends of the molecular chain with an average polymerization degree of about 3,000 blocked with silanol groups, and a silanol group-containing trifluoropropylmethylpolysiloxane (average polymerization degree of 15) as a dispersant 3 parts by mass and 16 parts by mass of dry silica [trade name Aerosil 130, BET specific surface area 130 m ² / g, manufactured by Nippon Aerosil Co., Ltd.] as a filler were added and heat-treated for 3 hours to prepare Compound E.

  According to Table 1, the above compound is used alone, or two compounds are blended with two rolls or the like, and 100 parts by mass of 2,5-dimethyl-2,5-di (t-butylperoxy) hexane as a curing agent is 25% by mass. 2 parts by mass of the containing paste was kneaded, and a 150 mm square and 2 mm thick sheet-shaped elastic body was molded using the obtained compound. The molding temperature was 165 ° C./10 minutes, and the molding pressure was 8 MPa.

（式中、Ｒ⁴はビニル基、ｘは１、ｑは７．５（平均値）、ｒは３（平均値）、ｐは２（平均値）であり、（ＣＨ₃）₂ＳｉＯ_2/2単位と（ＣＨ₃）（ＣＦ₃ＣＨ₂ＣＨ₂）ＳｉＯ_2/2単位とは、ブロックとして存在している。） In addition, when blending the dimethyl silicone composition of I-1 to II-2 and the fluorosilicone composition of III to V, 1.0 part by mass of a compatibilizing agent represented by the following general formula (5) was added.

(Wherein R ⁴ is a vinyl group, x is 1, q is 7.5 (average value), r is 3 (average value), p is 2 (average value), and (CH ₃ ) ₂ SiO _{2 / 2} units and (CH ₃ ) (CF ₃ CH ₂ CH ₂ ) SiO _2/2 units exist as blocks.)

Various tests shown below were conducted. These results are shown in Tables 1-4.
(Rubber hardness test)
The hardness of the obtained sheet-like sample was measured according to JIS K6249.

(Oil resistance test)
Using the obtained sheet-like sample, dimethyl silicone oil (trade name KF-966CS, manufactured by Shin-Etsu Chemical Co., Ltd.) that is recognized as having the most swellability among the components forming the bulk for lipstick. The volume change rate was confirmed. The volume change rate after 50 ° C. × 72 hours was examined, and less than 3% was accepted.

(Releasability test)
The obtained sheet-like sample was subjected to a simple releasability test using a commercially available lipstick bulk. First, the bulk was heated to 90 ° C. or higher to be dissolved, suspended on a sheet, and cooled at room temperature. After 10 minutes, the cooled and solidified bulk was removed with a metal spatula, and the degree of soiling of the sheet at that time and the glossiness of the surface of the removed bulk were observed and relatively evaluated. A glossy product with the presence or absence of visual glossiness was accepted.
The following was used as a commercial lipstick bulk.
Product name: MAQUILAGE PK256, RS336, RS375 (all manufactured by Shiseido Co., Ltd.)

  From the results of Tables 1 to 4, a fluorosilicone rubber composition (component (B) was further used, with an upper limit set for the degree of surface activity of the filler used in the dimethylsilicone rubber composition (component (A)). ) Using a filler whose surface activity is set to an upper limit, and blending the fluorosilicone rubber composition (component (B)) at a ratio in the range of 83 to 95% by mass, A silicone rubber blend composition suitable for molding a rod-like lipstick, which is excellent in properties and excellent in releasability with respect to oils and fats, waxes or mixtures thereof, is obtained.

Claims (8)

A silicone rubber blend composition containing the following components (A) to (C) as essential components.
(A) (A-1) an organopolysiloxane having an average degree of polymerization of 100 to 10,000 represented by the following average composition formula (1):
R _n SiO _{(4-n) / 2} (1)
(In the formula, R is the same or different unsubstituted monovalent hydrocarbon group or hydroxyl group, and at least two of all R groups in one molecule are aliphatic unsaturated groups. N is 1.95 to (It is a positive number of 2.05.)
(A-2) Reinforcing silica powder having a specific surface area (BET method) of 20 to 220 m ² / g: an amount of 30% by mass or less in the component (A) and satisfying the condition of the following formula (2),
Reinforcing silica powder specific surface area (m ² / g) × reinforcing silica powder mass ratio ≦ 40 (2)
(Here, the mass ratio of reinforcing silica powder is the mass ratio of (A-2) reinforcing silica powder to the total mass of component (A-1) and component (A-2).)
Silicone rubber composition comprising: 3 to 15 parts by mass,
(B) (B-1) an organopolysiloxane having an average polymerization degree of 1,000 to 7,000 represented by the following average composition formula (3):
R ¹ _a R ² _b R ³ _c SiO _{(4-abc) / 2} (3)
(In the formula, R ¹ is trifluoropropyl, R ² is a monovalent aliphatic unsaturated hydrocarbon group or a hydroxyl group of 2 to 8 carbon atoms, R ³ is unsubstituted, monovalent aliphatic saturated C1-8 A hydrocarbon group or an aromatic hydrocarbon group having 6 to 10 carbon atoms, wherein a, b and c are 0.96 ≦ a ≦ 1.01, 0.0001 ≦ b ≦ 0.01, 0.96 ≦ c ≦ 1.06, 1.98 ≦ a + b + c ≦ 2.02.
(B-2) Reinforcing silica powder having a specific surface area (BET method) of 20 to 220 m ² / g: 15% by mass or less in the component (B) and an amount satisfying the following formula (4):
Reinforcing silica powder specific surface area (m ² / g) × reinforcing silica powder mass ratio ≦ 30 (4)
(Here, the mass ratio of reinforcing silica powder is the mass ratio of (B-2) reinforcing silica powder to the total mass of component (B-1) and component (B-2).)
Fluorosilicone rubber composition comprising: 83 to 95 parts by mass,
(C) The following general formula (5)

(In the formula, R ⁴ is a monovalent aliphatic unsaturated hydrocarbon group having 2 to 8 carbon atoms, an unsubstituted monovalent aliphatic saturated hydrocarbon group having 1 to 8 carbon atoms, or an aromatic carbon atom having 6 to 10 carbon atoms. And represents a hydrogen group or a hydroxyl group, x is 0, 1 or 2, and p, q, and r are positive integers independent of each other.
An organopolysiloxane having a viscosity at 25 ° C. of 2,000 mPa · s or less represented by 0.05 to 2 parts by mass
(However, the total of components (A) to (C) is 100 parts by mass.) The silicone rubber blend composition according to claim 1, wherein the component (C) is an organopolysiloxane having a branched structure represented by the following formula (6).

(However, x ′ in the formula is 0 or 1, and R ⁴ , p, q, and r are the same as above.)   The silicone according to claim 1 or 2, wherein the silicone rubber composition of component (A) further comprises (A-3) a non-reactive silicone oil having a viscosity at 25 ° C in the range of 30 to 500 mPa · s. Rubber blend composition.   The silicone rubber blend composition according to claim 3, wherein the amount of the component (A-3) is 1 to 12 parts by mass with respect to 100 parts by mass of the component (A-1).   Furthermore, the silicone rubber blend composition of any one of Claims 1-4 formed by mix | blending a hardening | curing agent.   The silicone rubber blend composition according to any one of claims 1 to 5, wherein the hardness after curing (durometer type A) is 20 to 40.   The silicone rubber blend composition according to any one of claims 1 to 6, which is used for molding a stick-shaped lipstick.   A molding die for a stick-shaped lipstick obtained by curing and molding the silicone rubber blend composition according to any one of claims 1 to 7.