JP4493023B2 - Silicone mist inhibitor and coating composition containing the same - Google Patents

Description

  The present invention relates to a silicone mist inhibitor and a coating composition containing the same. The mist inhibitor is used by being added to the coating agent in order to suppress the silicone mist generated when the paper is coated with the silicone coating composition.

Solventless silicone compositions for release paper are used from the aspects of work environment safety and hygiene, and various types are known (for example, Patent Documents 1 to 4).

  Although the solventless silicone composition is applied at high speed, silicone called mist scatters in a mist form at the coater head portion. In recent years, with the speeding up of coating, the amount of mist increases, which is a problem. Therefore, various methods for reducing mist have been studied. For example, a method of adding an oxyalkylene-modified silicone compound to a solventless silicone is known (Patent Document 5).

Further, a partial reaction in which a mixture containing either an alkenyl group-containing siloxane or a polyorganohydrogensiloxane in a large excess (SiH group / alkenyl group molar ratio or the inverse thereof is 4.6 or more) was previously reacted with a platinum catalyst or the like. It is known that the amount of mist during high-speed coating can be reduced by adding a composition containing an adduct to solventless silicone (Patent Documents 6 and 7).
JP 49-47426 A Japanese Patent Laid-Open No. 50-141591 Japanese Patent Publication No.52-39791 JP 57-77395 A US Pat. No. 5,562,023 Japanese translation of PCT publication No. 2004-501262 JP-T-2004-501264

    The compositions described in Patent Documents 6 and 7 are excellent in the effect of suppressing mist. However, since the reactive SiH bond and the Pt catalyst remain in the composition, the mist inhibitor itself thickens over time. Even if the coating composition contains a control agent after the composition is added to the silicone coating composition, it can cause the coating composition to thicken or gelate over time. Then, an object of this invention is to provide the mist inhibitor excellent in storage stability.

Ｒ¹は、互いに独立に、水素原子、炭素数１〜4のアルキル基、又はフェニル基でありｎは10〜1500である、
（ｂ）１分子中に少なくとも２個のＳｉＨ結合を有するポリオルガノハイドロジェンシロキサンの残基からなる構成単位と、
を有するポリオルガノシロキサン（Ｉ）からなるミスト抑制剤である。 As a result of intensive studies to achieve the above object, the present inventor has found that the polyorganosiloxane having a predetermined structural unit is not only excellent in mist suppression action but also excellent in storage stability, It came to an eggplant.
That is, the present invention is a mist inhibitor for a solvent-free silicone coating composition,
(A) a structural unit comprising a residue of polyorganosiloxane (1) represented by:

R ¹ is independently of each other a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a phenyl group, and n is 10 to 1500.
(B) a structural unit comprising a residue of a polyorganohydrogensiloxane having at least two SiH bonds in one molecule;
It is a mist inhibitor made of polyorganosiloxane (I) having

The mist suppressing agent of the present invention is excellent in the mist suppressing effect. Furthermore, since it can be prepared without using a Pt catalyst, there is no such problem due to the residual Pt catalyst.

上式においてＲ¹は、互いに独立に、水素原子、炭素数１〜4のアルキル基、又はフェニル基、好ましくはメチル基又はフェニル基であり、ｎは50〜1000、好ましくは100〜300である。 The structural unit (a) of the polyorganosiloxane (I) constituting the mist inhibitor of the present invention is composed of the following residues of the polyorganosiloxane (1). The residues include those in which at least one of the SiOH bonds is SiO-, and those in which both are SiO-, and preferably both ends are SiO-.

In the above formula, R ^{1 s} are each independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a phenyl group, preferably a methyl group or a phenyl group, and n is 50 to 1000, preferably 100 to 300. .

式（２）において、Ｒ²は互いに独立に、炭素数１〜4のアルキル基、又はフェニル基、好ましくはメチル基又はフェニル基であり、ｋは２以上の数であり、好ましくは ２０ 以上、となる数であり、ｍは ０以上の数であり、且つ、ポリオルガノシロキサン（１）中のＳｉＯＨ結合に対する全ＳｉＨ結合、即ち、α＋ｋ＋βの合計、のモル数比（SiH／SiOH）が１０以上である。 The structural unit (b) is a residue of a polyorganohydrogensiloxane having at least two SiH bonds in one molecule, and preferably a polyorganohydrogensiloxane represented by the following average composition formula (2): Consists of residues. Such residues include those in which at least a part of SiH bonds H react to become Si-.

In the formula (2), R ² is each independently an alkyl group having 1 to 4 carbon atoms or a phenyl group, preferably a methyl group or a phenyl group, k is a number of 2 or more, preferably 20 or more, M is a number of 0 or more, and the molar ratio (SiH / SiOH) of all SiH bonds to the SiOH bonds in the polyorganosiloxane (1), that is, the sum of α + k + β is 10 or more. It is.

The polyorganosiloxane (I) is prepared by subjecting an organopolysiloxane (1) to a polyorganohydrogensiloxane having at least two SiH bonds in one molecule in the presence of a tin compound catalyst (II). Can do. The reaction conditions for the condensation reaction are not particularly limited, but typically the reaction is carried out at 20 to 100 ° C. for about 1 to 20 hours.

As the tin compound catalyst (II), a known tin compound for accelerating the condensation reaction can be used, and examples thereof include dibutyltin diacetate and dioctyltin diacetate. The tin compound may be added in an amount effective as a catalyst, but is usually based on the total weight of the organopolysiloxane (1) and the polyorganohydrogensiloxane having at least two SiH bonds in one molecule. And added in the range of 50 to 1000 ppm. Unlike conventional addition reaction catalysts, typically platinum catalysts, tin compound catalyst (II) is unlikely to cause problems such as thickening even if it remains in the reaction product together with unreacted Si-H. . Therefore, there is no practical problem even if the reaction product obtained by the above condensation reaction is used as a mist inhibitor without being purified.

The mist inhibitor of this invention can be mix | blended in 0.1-10 mass parts with respect to 100 mass parts of solventless type silicone coating compositions, Preferably it is 2-10 mass parts. When the addition amount of the mist inhibitor is less than the lower limit value, a sufficient mist suppression effect cannot be obtained, and when it exceeds the upper limit value, SiH remaining in the mist inhibitor reacts with the components in the coating composition. This is not preferable because it may increase the peeling force of the coating layer.

The mist suppressant of the present invention can be used with various solvent-free silicone coating compositions, but is preferably used with those containing the following (III) to (V).
(III) at least two alkenyl groups bonded to a silicon atom in one molecule, and
It is contained at 0.002 to 0.60 mol in 100 g, and the viscosity at 25 ° C. is 50 to
100 parts by mass of polyorganosiloxane which is 100000 mPa · s,
(IV) A polyorganohydrogensiloxane having at least two SiH bonds in one molecule has a molar ratio of SiH bonds to the number of moles of alkenyl groups in the polyorganosiloxane (II) (SiH / SiVi) of 0.5 to 5 And (V) a catalytic amount of a platinum group metal compound.

The polyorganosiloxane (III) has at least two alkenyl groups bonded to silicon atoms in one molecule and 0.002 to 0.60 mol, preferably 0.005 to 0.3 mol in 100 g. In a proper amount. If the amount of the alkenyl group is less than the lower limit, a practical curing rate may not be obtained, and if the upper limit is exceeded, the peeling force may be excessively increased.

式中、Ｒ³は同一または異種の、置換されていてよい炭化水素基、Ｒ⁴は−（ＣＨ₂）_c−ＣＨ＝ＣＨ₂（ｃは０〜６）で表されるアルケニル基であり、ａは０≦ａ≦３、ｂは０＜ｂ≦３、ａ＋ｂは１≦ａ＋ｂ≦３である。 Preferably, polyorganosiloxane (III) represented by the following average formula (3) is used.

In the formula, R ³ is the same or different hydrocarbon group which may be substituted, R ⁴ is an alkenyl group represented by — (CH ₂ ) _c —CH═CH ₂ (c is 0 to 6), a is 0 ≦ a ≦ 3, b is 0 <b ≦ 3, and a + b is 1 ≦ a + b ≦ 3.

Examples of R ³ include alkyl groups such as a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, an octyl group, a decyl group, a dodecyl group, a tetradecyl group, a hexadecyl group, and an octadecyl group; A aryl group such as a phenyl group, a naphthyl group, or a tolyl group; or a group in which some or all of the hydrogen atoms bonded to the carbon atoms of these groups are substituted with a halogen atom, a cyano group, a hydroxyl group, or the like. Examples thereof include chloromethyl group, 3,3,3-trifluoropropyl group, cyanopropyl group, phenol group, hindered phenol group and the like. In the present invention, an alkyl group having 1 to 8 carbon atoms and a phenyl group are preferable, a methyl group is particularly preferable, and 50 mol% of all R ³ is preferably a methyl group.

   Preferably, a is 0.5 ≦ a ≦ 2.5, b is 0.0002 ≦ b ≦ 1, and a + b is 1.5 ≦ a + b ≦ 2.5.

Examples of R ⁴ include a vinyl group, a propenyl group, a butenyl group, a pentenyl group and the like, and those having an unsaturated bond at the end, that is, a vinyl group, an allyl group, an isopropenyl group, a 3-butenyl group, 4- A pentenyl group and the like are preferable, and a vinyl group and an allyl group are more preferable.

  The polyorganosiloxane (III) may be either linear or branched. Moreover, the terminal may be any organic group such as a methyl group, a hydroxyl group, an alkenyl group, a phenyl group, and an acryloxyalkyl group, but is preferably an alkenyl group. The viscosity of the polyorganosiloxane (III) is 50 to 100,000 mPa · s, preferably 100 to 2000 mPa · s at 25 ° C.

式中、Ｒ⁵は非置換又は置換の一価炭化水素基であり、脂肪族不飽和結合を含まない炭素数１〜８のものである。 Next, polyorganohydrogensiloxane (IV) has two or more SiH bonds in one molecule, and a cured film is formed by addition reaction between the SiH bonds and the alkenyl group of polyorganosiloxane (III). . The polyorganohydrogensiloxane (IV) is preferably represented by the following average formula (4).

In the formula, R ⁵ is an unsubstituted or substituted monovalent hydrocarbon group and has 1 to 8 carbon atoms and does not contain an aliphatic unsaturated bond.

Examples of R ⁵ include alkyl groups such as a methyl group, an ethyl group, and a propyl group, aryl groups such as a phenyl group, and halogen-substituted alkyl groups such as a 3,3,3-trifluoropropyl group. 80% of R ⁵ is a methyl group.

  D and e are 0.5 ≦ d ≦ 1.5, 0.5 ≦ e ≦ 1.5, 0 ≦ d + e ≦ 3.0, particularly 0.8 ≦ d ≦ 1.0, 0.8 ≦ e. It is preferable that ≦ 1.0 and 1.6 ≦ d + e ≦ 2.0.

  The amount of polyorganohydrogensiloxane (IV) blended is 0.5 parts by weight, preferably 1 to 3 times the number of moles of SiH bonds in moles of alkenyl groups in polyorganosiloxane (III). It should have become. When the blending amount is less than or equal to the lower limit amount, curing becomes insufficient, and when the blending amount exceeds the upper limit value, the peeling force may become too large.

  Next, the platinum group metal compound (V) is a catalyst for promoting an addition reaction between polyorganosiloxane (III) and polyorganohydrogensiloxane (IV), and a known addition reaction catalyst can be used. . Examples of such platinum group metal-based catalysts include platinum-based, palladium-based, rhodium-based, and ruthenium-based catalysts. Of these, platinum-based catalysts are particularly preferably used. Examples of the platinum-based catalyst include chloroplatinic acid, alcohol solution or aldehyde solution of chloroplatinic acid, complexes of chloroplatinic acid with various olefins or vinyl siloxane, and the like. The addition amount of these platinum group metal catalysts is a catalytic amount, but in addition to obtaining a good cured film, the total weight of polyorganosiloxane (III) and polyorganohydrogensiloxane (IV) from the economical point of view. Thus, the platinum metal amount is preferably in the range of 1 to 1000 ppm. Each of (III) to (V) may be a single type or a mixture of two or more types.

  The mist inhibitor of this invention is added at 0.1-10 mass parts with respect to 100 mass parts of said polyorganosiloxane (III) as above-mentioned. At the time of addition, after mixing polyorganosiloxane (III), polyorganohydrogensiloxane (IV), mist inhibitor, and optional components as desired in advance, platinum catalyst (V) is added. It is preferable to prepare. The platinum catalyst may be added immediately before coating, for example, 30 minutes before. The mist agent of the present invention may also be added immediately before coating. However, it is desirable to blend in advance from the viewpoint of work efficiency, and the inhibitor of the present invention is advantageous because there is no problem such as thickening even if blended in advance.

For the purpose of suppressing the catalytic activity of the platinum group metal catalyst, for example, various known organic nitrogen compounds, organic phosphorus compounds, acetylene compounds, oxime compounds, organic chloro compounds and the like are added to the coating composition. can do. Examples of such a control agent include 3-methyl-1-butyn-3-ol, 3,5-dimethyl-1-hexyn-3-ol, 3-methyl-1-pentyn-3-ol, and phenylbutynol. Acetylenic alcohols such as acetylene compounds such as 3,5-dimethyl-1-hexyne-3-yne, reaction products of these acetylenic compounds with alkoxysilanes or siloxanes or hydrogensilanes or siloxanes, tetramethylvinylsiloxane Examples thereof include vinyl siloxanes such as cyclic compounds, organic nitrogen compounds such as benzotriazole, other organic phosphorus compounds, oxime compounds, and organic chromium compounds.

  Moreover, the compounding amount of the compound as the control agent may be an amount that provides good treatment bath stability, and is generally based on 100 parts by weight of the polyorganosiloxane (III) and the polyorganohydrogensiloxane (IV). 0.01 to 10 parts by weight, preferably 0.05 to 5 parts by weight.

  On the other hand, silicone resin, silica, or polyorganosiloxane having no SiH bond or alkenyl group can be added in an amount that does not hinder the effects of the present invention for the purpose of controlling the peeling force.

The silicone coating composition (VI) thus prepared is applied to various substrates and thermally cured. The substrate is not particularly limited, and various substrates generally used for release paper can be used. Examples thereof include glassine paper, clay coated paper, high quality paper, polyethylene laminated paper, and plastic film. Moreover, there is no restriction | limiting in particular also in the coating amount of a silicone composition, However, Usually, what is necessary is just about 0.05-3.0 g / m < ² >. In addition, it is preferable to perform hardening of the said silicone composition at 50-200 degreeC, and heating time can be 1 second-5 minutes.

３００質量部（SiOHモル数 0.05 ）と、下記平均式で表されるポリオルガノハイドロジェンシロキサンの３２０質量部（SiHモル数1.92）を良く混合し、

該混合物に、ジオクチルスズジアセテートを０．４５質量部を添加して混合し、攪拌しながら８５℃で２時間反応させて、粘度約１８０ｍＰ・ｓの淡黄色透明な液体（以下「M−１」と言う）を得た。 EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated in detail, this invention is not limited by this.
Example 1 Preparation of Mist Inhibitor Polyorganosiloxane having silanol groups at both ends represented by the following formula

300 parts by mass (SiOH mol number 0.05) and 320 parts by mass of polyorganohydrogensiloxane represented by the following average formula (SiH mol number 1.92) were mixed well,

To this mixture, 0.45 parts by mass of dioctyltin diacetate was added and mixed, and the mixture was reacted at 85 ° C. for 2 hours with stirring to give a pale yellow transparent liquid having a viscosity of about 180 mP · s (hereinafter “M-1”). ”).

下記平均式で表されるオルガノポリシロキサン３００ 重量部（ＳｉＨ／ＳｉＶｉ比＝ ４０ ）をよく混合し、塩化白金酸０．５重量％のトルエン溶液２部を加えた後、

30℃で20時間反応させて、ミスト抑制剤Ｒ−１を得た。Ｒ−１は、粘度約１２００ｍＰ・ｓであった。 Comparative Example 1
A conventional mist inhibitor was synthesized as described below in accordance with the description in Patent Document 7 (Special Table 2004-501264).
360 parts by mass of an organohydrogenpolysiloxane represented by the following average formula:

After thoroughly mixing 300 parts by weight of organopolysiloxane represented by the following average formula (SiH / SiVi ratio = 40) and adding 2 parts of a toluene solution of 0.5% by weight of chloroplatinic acid,

It was made to react at 30 degreeC for 20 hours, and mist inhibitor R-1 was obtained. R-1 had a viscosity of about 1200 mP · s.

Aging stability test
M-1 and R-1 were each stored at 50 ° C. for 3 weeks, and then their viscosities were measured. The former was about 190 mP · s (5% increase), and the latter was 2100 mPa · s (75% increase).
This shows that the mist inhibitor of this invention is excellent in storage stability.

エチニルシクロヘキサノール０．３質量部を均一に混合し、さらに、前記で合成したM−１を１．０質量部添加した。ミスト発生実験30分前に、塩化白金酸とビニルシロキサンの錯塩を２質量部（白金原子として約１００ｐｐｍ）を添加して、さらに均一に混合し、ミスト発生実験に使用した。 Example 2 Preparation of Coating Composition 98 parts by mass of vinyldimethyl group-containing polydimethylsiloxane having a viscosity at 25 ° C. of 400 mPa · s and a vinyl value of 0.02 mol / 100 g, represented by the following average formula: 2.0 parts by weight of organohydrogensiloxane,

0.3 part by mass of ethynylcyclohexanol was uniformly mixed, and 1.0 part by mass of M-1 synthesized above was further added. Thirty minutes before the mist generation experiment, 2 parts by mass of a complex salt of chloroplatinic acid and vinylsiloxane (about 100 ppm as platinum atoms) was added and mixed more uniformly, and used for the mist generation experiment.

Example 3 Preparation of Coating Composition A composition was prepared in the same manner as in Example 2 except that 4.0 parts by mass of the mist inhibitor (M-1) was mixed and subjected to a mist generation experiment.

Comparative Example 2
A coating composition was prepared in the same manner as in Example 2 except that the mist inhibitor M-1 of the present invention was not added, and was subjected to a mist generation experiment.

表２に、比較例２の組成物で発生したミスト量を１００としたときの、実施例２及び３の各組成物におけるミストの減少率、 [（比較例２のミスト量‐実施例２又は３のミスト量）／比較例２のミスト量]×１００、を表示した。

表２から、本発明のミスト抑制剤（M−１)を含有することにより、高速塗工時のミストの発生量を顕著に低減できることが分かる。 Mist generation experiment An experiment was performed using a coater head composed of five rolls as shown in FIG. Each of the silicone compositions prepared above (Examples 2 and 3 and Comparative Example 2) was placed between rolls D and E, and each roll was adjusted to the speed shown in Table 1. The amount of mist-like silicone particles (mist) generated between rolls A and B was measured for 1 minute using a particle counter 8520DustTrak (trademark) manufactured by Transtec Corporation.

Table 2 shows the reduction rate of mist in each composition of Examples 2 and 3 when the amount of mist generated in the composition of Comparative Example 2 is 100, [(Mist amount of Comparative Example 2−Example 2 or 3) / mist amount of Comparative Example 2] × 100.

From Table 2, it can be seen that the amount of mist generated during high-speed coating can be significantly reduced by containing the mist inhibitor (M-1) of the present invention.

Example 4 Preparation of coating composition A composition was prepared in the same manner as in Example 2 except that 2.0 parts by mass of the mist inhibitor M-1 was blended. The rate was measured.

Example 5 Preparation of coating composition A composition was prepared in the same manner as in Example 2 except that 6.0 parts by mass of the mist inhibitor M-1 was blended, and the following peeling force and residual adhesion rate were prepared. Was measured.

Reference Example 1 Preparation of coating composition A composition was prepared in the same manner as in Example 2 except that 12.0 parts by mass of the mist inhibitor (M-1) was blended. The adhesion rate was measured.

Generation of cured film for measuring peel force and residual adhesion rate Immediately after preparation of the silicone composition, the silicone composition was applied to polyethylene laminated paper at 1.0 g / m ² and dried at 160 ° C. with hot air. Heated in the machine for 10 seconds to form a cured film.

Measurement of peeling force An acrylic pressure-sensitive adhesive BPS-5127 (manufactured by Toyo Ink Co., Ltd.) was applied to the surface of the cured film obtained by the above method and heated at 100C for 3 minutes. Next, a high-quality paper was bonded to the surface coated with the pressure-sensitive adhesive, a sample having a width of 5 cm × 18 cm was cut out from the obtained laminated film, and a sample obtained by aging the sample at room temperature for 1 day was used. Using a tensile tester, the force required to peel the acrylic adhesive layer from the cured film of the laminated film of the sample at an angle of 180 ° at a peeling speed of 0.3 m / min was determined as the peeling force. .

実施例４、５から、本発明のミスト抑制剤（M−１）を含有した場合でも、粘着剤を剥離することができ、本発明の組成物が剥離紙用ミスト抑制剤として有用なことがわかった。参考例に示すように、該ミスト抑制剤の濃度が高い場合には、剥離性を低下させる場合があるが、剥離紙以外の用途においてミスト発生を抑制する目的で使用するのには何ら問題は無い。 Residual adhesion rate A polyester tape (Nitto 31B, manufactured by Nitto Denko Corporation) is bonded to the surface of the cured film obtained by the above method, and a heat treatment is performed at 70 ° C. for 20 hours under a load of 1976 Pa. After that, I removed this tape. The peeled tape was affixed to a stainless steel plate, and the force required to peel the tape from the stainless steel plate using a tensile tester was measured in the same manner as in the peel strength test.
As a reference sample, a polyester tape was attached to a stainless steel plate, the force required to peel the tape from the stainless steel plate was measured, and the percentage of the peeling force relative to the reference force was defined as the residual adhesion rate. A larger numerical value indicates less migration of the silicone component from the cured film to the tape, indicating that the cured film is excellent in peelability.

From Examples 4 and 5, even when containing the mist inhibitor (M-1) of the present invention, the pressure-sensitive adhesive can be peeled off, and the composition of the present invention is useful as a mist inhibitor for release paper. all right. As shown in the reference example, when the concentration of the mist inhibitor is high, the releasability may be lowered, but there is no problem in using it for the purpose of suppressing mist generation in applications other than release paper. No.

  As described above, the mist inhibitor of the present invention is not only effective in suppressing mist but also excellent in storage stability and useful for coating applications.

It is the schematic of the coater head which consists of five rolls used in the mist generation experiment.

Explanation of symbols

1 Mist 2 Silicone coating composition

Claims (9)

A mist inhibitor for a solvent-free silicone coating composition,
(A) a structural unit comprising a residue of polyorganosiloxane (1) represented by:

R ¹ is independently of each other a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a phenyl group, and n is 10 to 1500.
(B) a structural unit comprising a residue of a polyorganohydrogensiloxane having at least two SiH bonds in one molecule;
A mist inhibitor comprising polyorganosiloxane (I) having    The mist suppressor according to claim 1, wherein the viscosity is 100 to 3000 mPa · s. The structural unit (b) comprises a residue of a polyorganohydrogensiloxane represented by the following average formula (2): The mist inhibitor according to claim 1 or 2,

R ² is independently an alkyl group having 1 to 4 carbon atoms or a phenyl group, k is a number of 2 or more, m is a number of 0 or more, and α and β are integers of 0 to 3 And the ratio of the number of moles of SiH bonds to the number of moles of SiOH bonds in the polyorganosiloxane (1) (SiH / SiOH) is 10 or more. A method for producing a mist inhibitor for a solvent-free silicone coating composition, comprising:
A polyorganosiloxane (1) represented by the following formula:

R ¹ is independently of each other a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a phenyl group, and n is 10 to 1500.
A method of reacting (II) a tin compound catalyst with a polyorganohydrogensiloxane having at least two SiH bonds in one molecule. The method according to claim 4, wherein the polyorganohydrogensiloxane having at least two SiH bonds in one molecule is represented by the following formula.

R ² is independently an alkyl group having 1 to 4 carbon atoms or a phenyl group, k is a number of 2 or more, m is a number of 0 or more, and α and β are integers of 0 to 3 And the ratio of the number of moles of SiH bonds to the number of moles of SiOH bonds in the polyorganosiloxane (1) (SiH / SiOH) is 10 or more. A solventless silicone composition comprising:
(III) Organopolysiloxane having at least two alkenyl groups in one molecule, an alkenyl group content of 0.002 to 0.60 mol / 100 g, and a viscosity at 25 ° C. of 50 to 100,000 mPa · s 100 parts by mass (IV) A polyorganohydrogensiloxane having at least two SiH bonds, wherein the number of moles of SiH bonds corresponds to 0.5 to 5 times the number of alkenyl groups in organopolysiloxane (III), and (V) catalyst. Amount of platinum group metal compound,
The mist inhibitor according to any one of claims 1 to 3,
A coating composition comprising:  The coating composition according to claim 6, comprising 0.1 to 10 parts by mass of a mist inhibitor with respect to 100 parts by mass of organopolysiloxane (III). The coating composition according to claim 6 or 7, wherein the organopolysiloxane (III) is represented by the following average formula (3):

Wherein R ³ is the same or different hydrocarbon group which may be substituted,
R ⁴ is an alkenyl group represented by — (CH ₂ ) _c —CH═CH ₂ (c is an integer of 0 to 6), a is 0 ≦ a ≦ 3, b is 0 <b ≦ 3, and 1 ≦ a + b ≦ 3. The coating composition according to any one of claims 6 to 8, wherein the organohydrodienesiloxane (IV) is represented by the following average formula (4):

In the formula, R ⁵ is a monovalent hydrocarbon group having 1 to 8 carbon atoms which does not contain an aliphatic unsaturated bond, and d and e are 0.7 ≦ d ≦ 2.1, 0.8. It is a number that satisfies 001 ≦ e ≦ 1.0 and 0.8 ≦ d + e ≦ 2.6.

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