KR101174916B1 - Room Temperature Curable Organopolysiloxane Composition - Google Patents

Abstract

This invention provides the room temperature curable organopolysiloxane composition which is excellent in quick hardening property and adhesiveness, and is excellent in fluidity | liquidity, viscosity stability, and storage stability.

(A) one or two or more selected from organopolysiloxanes represented by the following Chemical Formulas 1 to 4: 100 parts by mass,

(B) Aging catalyst formed by mixing (i) a titanium chelate catalyst and / or an organoxititan represented by the following formula (5) with (ii) a silane coupling agent and aging: 0.5 to 15 parts by mass

There is provided a room temperature curable organopolysiloxane composition, comprising as an essential component.

<Formula 1>

<Formula 2>

<Formula 3>

&Lt; Formula 4 >

Wherein R is a methyl group or an ethyl group, R ¹ is a monovalent hydrocarbon group, Y is an alkylene group, Z is an alkenyl group, p is an integer of 10 or more, q is an integer of 1 or more, and n is independently 0 Or 1, R ² is

Wherein R, R ¹ , Y, and n are the same as those described above.

&Lt; Formula 5 >

Ti (OR ³ ) ₄

In the formula, R ³ is a monovalent hydrocarbon group.

Room Temperature Curability, Organopolysiloxane, Titanium Chelate Catalyst, Organoxititan, Silane Coupling Agent, Aging Catalyst

Description

Room temperature curable organopolysiloxane composition

<Patent Document 1> Japanese Patent Application Laid-Open No. 3-91564

<Patent Document 2> Japanese Unexamined Patent Publication No. 6-73293

<Patent Document 3> Japanese Unexamined Patent Publication No. 6-179818

<Patent Document 4> Japanese Patent Application Laid-Open No. 2001-302934

<Patent Document 5> Japanese Patent Application Laid-Open No. 7-173435

<Patent Document 6> Japanese Unexamined Patent Publication No. 2003-188503

Patent Document 7: Japanese Unexamined Patent Publication No. 2003-128917

Patent Document 8: Japanese Unexamined Patent Application Publication No. 2004-143331

FIELD OF THE INVENTION The present invention relates to room temperature curable organopolysiloxane compositions which are preferably used for construction, ship floor coating, electrical / electronic parts, liquid crystal, PDP, and the like. The present invention relates to a room temperature curable organopolysiloxane composition for use in protective coating applications, and to a room temperature curable organopolysiloxane composition that is excellent in fast curing property and adhesiveness and has good fluidity, viscosity stability, and storage stability.

Conventionally, various types of room-temperature-curable organopolysiloxane compositions which are cured at room temperature by contact with moisture in the air are known, but among them, those of the type that releases and cure alcohol do not corrode metals, and thus are mainly used in electrical and electronic equipment. It is often used for sealing, adhesion, and coating of such materials. Among them, a mounting circuit board (circuit board) used as a mounting component for automobiles, aircrafts, etc., maintains its electrical insulation satisfactorily and protects the circuit board from harsh external environments such as high temperature, high humidity, immersion and dust. Coating of the said electric and electronic components with the composition for coating which uses resin and a high viscosity oil as a main raw material is performed.

However, when the resin is used as the main raw material, good mechanical properties are obtained, but it is difficult to provide adhesion to the circuit board, and when high viscosity oil is used, workability and productivity are low. To replenish, dilution with an organic solvent or the like is applied. In recent years, the composition which used the organic solvent is reluctant in that it has an adverse effect on the environmental problem by the air | atmosphere release of the organic solvent, and the health of a worker etc. Therefore, development of the composition which does not contain the organic solvent etc. and has favorable adhesiveness to resins, such as a mounting circuit board, was calculated | required.

In addition, as a well-known document which concerns on this invention, said thing is mentioned.

This invention is made | formed in view of the said situation, Comprising: It aims at providing the room temperature hardenable organopolysiloxane composition which is excellent in quick hardening property and adhesiveness, and is excellent in fluidity | liquidity, viscosity stability, and storage stability.

MEANS TO SOLVE THE PROBLEM As a result of earnestly examining in order to achieve the said objective, (A) 1 or 2 or more types selected from organopolysiloxane represented by following General formula (1)-(B) (i) titanium chelate catalyst, and ( Or) by using the aging catalyst formed by mixing and organizing the organocityitane represented by the following formula (5) with the (ii) silane coupling agent as an essential component, it is excellent in fast curing property and adhesiveness, and has fluidity, viscosity stability, It discovered that the room temperature curable organopolysiloxane composition with favorable storage stability was obtained, and came to complete this invention.

Therefore,

(A) one or two or more selected from organopolysiloxanes represented by the following Chemical Formulas 1 to 4: 100 parts by mass,

(B) Aging catalyst formed by mixing (i) a titanium chelate catalyst and / or an organoxititan represented by the following formula (5) with (ii) a silane coupling agent and aging: 0.5 to 15 parts by mass

It provides a room temperature curable organopolysiloxane composition characterized by including as an essential component.

Wherein R is a methyl group or an ethyl group, R ¹ is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 10 carbon atoms, Y is an alkylene group having 1 to 5 carbon atoms, and p is an integer of 10 or more , n is independently 0 or 1.

In the formula, R, R ¹ , Y, p and n are as described above, and Z is an alkenyl group having 2 to 5 carbon atoms.

In formula, R, R <^1> , Y, p, n are as above-mentioned, and R <^2> is a following formula

(Wherein R, R ¹ , Y and n are the same as described above) and a branched chain containing a hydrolyzable group, q is an integer of 1 or more.

In formula, R, R <^1> , R <^2> , Y, Z, p, q, n are as above-mentioned.

Ti (OR ³ ) ₄

In the formula, R ³ is a monovalent hydrocarbon group having 2 to 10 carbon atoms.

BEST MODE FOR CARRYING OUT THE INVENTION [

(A) component used by this invention becomes a base polymer of this composition, and in order to acquire storage stability, it is necessary to be 1 type, or 2 or more types chosen from organopolysiloxane represented by following General formula (1-4).

<Formula 1>

<Formula 2>

<Formula 3>

&Lt; Formula 4 >

Wherein R is a methyl group or an ethyl group, R ¹ is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 10 carbon atoms, Y is an alkylene group having 1 to 5 carbon atoms, and Z is 2 carbon atoms An alkenyl group of 5 to 5, p is an integer of 10 or more, q is an integer of 1 or more, n is independently 0 or 1, and R ² is a chemical formula

Wherein R, R ¹ , Y, and n are the same as those described above.

In said Formula (1-4), R is a methyl group or an ethyl group, and a methyl group is preferable. R ¹ is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 10 carbon atoms, particularly 1 to 6 carbon atoms, for example, an alkyl group such as methyl group, ethyl group, propyl group, cycloalkyl group such as cyclohexyl group, and these groups. Groups in which a hydrogen atom is partially substituted with a halogen atom, for example, a 3,3,3-trifluoropropyl group, and the like, and include a methyl group, an ethyl group, a vinyl group, a phenyl group, a 3,3,3-trifluoro A propyl group is preferable and a methyl group is especially preferable. The plurality of R ¹ in Formulas 1 to 4 may be the same group or different groups.

Moreover, Y is a C1-C5 alkylene group, As an alkylene group, a methylene group, an ethylene group, a propylene group, butylene group, etc. are mentioned, An ethylene group is preferable. Polymers in which Y is an oxygen atom are also well known, but in the present invention, when Y is an oxygen atom, storage properties are insufficient.

Z is a C2-C5 alkenyl group, A vinyl group, an allyl group, butenyl group, pentenyl group, etc. are mentioned as an alkenyl group, Among these, a vinyl group is preferable.

p is an integer of 10 or more, preferably an integer of 40 to 1,000, q is an integer of 1 or more, preferably an integer of 1 to 5, n is independently 0 or 1.

The preferable viscosity of (A) component is 50-100,000 mPa * s on 25 degreeC conditions. This is because if the viscosity is less than 50 mPa · s, it may not be possible to provide excellent physical properties, particularly flexibility and impact resistance, to the elastomer after curing, and if the viscosity is greater than 100, OO mPa · s, the viscosity of the composition is increased and fluidity is increased. This is because there is a fear that this is significantly reduced. Therefore, More preferably, it is 100-20,000 mPa * s. In addition, this viscosity is a measured value by a rotational viscometer.

The component (B) used in the present invention is a aging catalyst formed by mixing (i) a titanium chelate catalyst and / or an organoxititan represented by the following formula (5) and (ii) a silane coupling agent in advance and aging: This aging catalyst is an important component for imparting adhesion and viscosity stability in the present invention.

&Lt; Formula 5 >

Ti (OR ³ ) ₄

In the formula, R ³ is a monovalent hydrocarbon group having 2 to 10 carbon atoms.

Examples of the titanium chelate catalyst used for the component (B) include diisopropoxy bis (ethyl acetate) acetate, titanium acetylacetonate, titanium ethyl acetonate, titanium octane dioleate and the like.

In addition, in Formula 5, R ³ is a monovalent hydrocarbon group having 2 to 10 carbon atoms, for example, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a tert-butyl group, and a tert- Alkyl alkyl groups, such as an alkyl group, such as an amyl group, a pentyl group, a neopentyl group, a hexyl group, an octyl group, a nonyl group, and a decyl group, a methoxyethyl group, an ethoxyethyl group, a propoxyethyl group, a methoxypropyl group, an ethoxypropyl group, etc. Etc. can be mentioned.

Examples of the organocytitane represented by the general formula (5) include tetra-tert-butoxytitanium, tetraisopropyl titanate, tetra n-butyl titanate, tetra (2-ethylhexyl) titanate, and tetraisobutyl titanate. Nate, tetra (2-methyl-2-butoxy) titanate, tetra n-propyl titanate, tetraethyl titanate, tetrahexyl titanate, tetraoctyl titanate, tetranonyl titanate, tetradecyl titanate, etc. are mentioned. Can be.

In addition, as a silane coupling agent used for (B) component, although it does not specifically limit, such as a (meth) acrylsilane coupling agent and an epoxysilane coupling agent, Especially, it is more preferable to use an epoxy silane coupling agent. Specific examples of the epoxysilane coupling agent include β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyltriethoxysilane, and the like. do.

The titanium chelate catalyst and / or the organoxititan represented by the formula (5) (hereinafter, these are called titanium catalysts) and the silane coupling agent need to be mixed and aged beforehand. Here, aging means transesterification of a portion of an alkoxy group of a titanium catalyst and a portion of an alkoxy group of a silane coupling agent and / or hydrolyzing and oligomerizing a part of the silane coupling agent with a titanium catalyst with water contained in air or the like. Means that.

Here, the mixing ratio of the (i) titanium catalyst and (ii) silane coupling agent is preferably in the range of 0.2 to 5.0 in mass ratio (ii) / (i) [silane coupling agent / titanium catalyst], more preferably. Preferably in the range of 0.5 to 3.0. If the mass ratio is less than 0.2, sufficient adhesiveness may not be obtained. If the mass ratio is higher than 5.0, the composition may not only suffer from retardation of curability, rubber properties and mechanical properties after curing, but also disadvantageously. Become.

Moreover, as conditions for aging a mixture of a titanium catalyst and a silane coupling agent, aging by heat is preferable because aging can be promoted. As heat aging conditions, it is preferable to carry out for 1 to 1,000 hours in the range of the temperature of 40-100 degreeC, More preferably, it is aged for 5 to 100 hours in the range of the temperature of 50-80 degreeC. When the temperature is lower than 40 ° C, the maturation is difficult to reach equilibrium, which may take a long time, and when it exceeds 100 ° C, the catalyst capacity of the titanium catalyst contained in the component (B) may be lowered. .

The compounding quantity of (B) component is used in 0.5-15 mass parts with respect to 100 mass parts of (A) component, Preferably it is used in the range of 0.8-5 mass parts. If it is less than 0.5 mass part, sufficient adhesiveness and hardened | cured material will not be obtained, and it will be hard to be a composition which has a desired rubber elasticity, and when it exceeds 15 mass parts, the mechanical characteristic of the hardened | cured material obtained will fall.

In this invention, non-reactive silicone oil can be mix | blended further as (C) component, and by mix | blending this component, the fluidity | liquidity and the rubber physical property after hardening can be adjusted. Examples of such non-reactive silicone oils include dimethylpolysiloxanes in which both ends are sealed with trimethylsilyl groups.

It is preferable that the viscosity (25 degreeC) of this non-reactive silicone oil is 5-50,000 mPa * s, especially 50-5,000 mPa * s. Non-reactive silicone oil may bleed from the hardened | cured material obtained when a viscosity (25 degreeC) is less than 5 mPa * s, and the fluidity | liquidity and workability of a composition may fall when it exceeds 50,000 mPa * s. In addition, this viscosity is a measured value by a rotational viscometer.

It is preferable that the compounding quantity of (C) component is 0-50 mass parts with respect to 100 mass parts of (A) component, More preferably, it is 1-50 mass parts, Especially preferably, it is 2-10 mass parts. . If the amount exceeds 50 parts by mass, the non-reactive silicone oil may bleed. Moreover, the workability of a composition may fall too much, or the mechanical characteristic of hardened | cured material may fall too much.

Moreover, in this invention, as a component (D), the silane compound which has an average of 2 or more in 1 molecule, its partial hydrolyzate, or a mixture thereof can further be mix | blended as a component.

As a specific example of the silane compound which has an average of 2 or more hydrolysable groups couple | bonded with the silicon atom, and its partial hydrolyzate, methyltrimethoxysilane, vinyltrimethoxysilane, phenyltrimethoxysilane, vinyltriethoxysilane, etc. Alkoxysilanes and partial hydrolysates of these silanes.

It is preferable that the compounding quantity of (D) component is the range of 0-20 mass parts with respect to 100 mass parts of (A) component, More preferably, it is the range of 0.5-20 mass parts, More preferably, it is the range of 1-5 mass parts to be. When it exceeds 20 mass parts, the mechanical characteristic of the hardened | cured material obtained may fall. In addition, when too few, workable time may become short.

In addition, in this invention, 1 or more types of filler can be mix | blended as (E) component. Fillers are reinforcing and non-reinforcing fillers for imparting rubber properties to the composition, and specifically, surface treatment, untreated aerosol silica, precipitated silica, wet silica, carbon powder, talc, bentonite, surface treatment, and untreated Calcium carbonate, zinc carbonate, magnesium carbonate, surface treatment, untreated calcium oxide, zinc oxide, magnesium oxide, aluminum oxide, aluminum hydroxide and the like are exemplified, more preferably the surface of the filler is treated, and the amount of water Less fillers are preferred.

As a compounding quantity of the filler of (E) component, it is preferable that it is 0-100 mass parts with respect to 100 mass parts of (A) component, More preferably, it is 1-100 mass parts, More preferably, it is 2-50 mass parts.

The room temperature curable organopolysiloxane composition of the present invention includes conventional room temperature curable organopolysiloxanes such as organic solvents, antifungal agents, flame retardants, heat resistant agents, plasticizers, adhesion promoters, curing accelerators, and pigments within a range that does not impair the object of the present invention. The well-known additive in a composition can be added suitably.

The room temperature curable organopolysiloxane composition of this invention can be obtained by mixing the said (A), (B) component, and (C)-(E) component and various additives as needed in the state which interrupted moisture. The obtained organopolysiloxane composition can be used as a so-called 1 package type room temperature curable organopolysiloxane composition which is stored as it is in a sealed container and cured into a rubbery elastomer by being exposed to moisture in the air during use.

Moreover, it is preferable that the room temperature curable organopolysiloxane composition of this invention is 50-100,000 mPa * s, especially 100-50,000 mPa * s in the viscosity in 25 degreeC measured with the rotational viscometer.

The room temperature curable organopolysiloxane composition of the present invention is used for construction, bottom coating, electrical and electronic parts, liquid crystal, and PDP, and in particular, as a sealing material, adhesive, and moisture proof coating agent for electrical and electronic parts, fiber products, glass It can be applied to coatings and adhesives for products, metal products, plastic products and the like.

<Examples>

Hereinafter, the present invention will be described in detail by showing synthesis examples, examples and comparative examples, but the present invention is not limited to the following examples. In addition, in the following example, a part shows a mass part and a viscosity shows the measured value of the measuring method by the rotational viscometer in 25 degreeC.

Synthesis Example 1

In a volume 15 liter three-necked flask equipped with a thermometer, agitator and cooler, 10,000 g of α, ω-dimethylvinyl-dimethylpolysiloxane having a viscosity of 600 mPa · s, 136 g of trimethoxysilane and 50% of chloroplatinic acid as a catalyst Add 4.0 g of toluene solution, N ₂ It mixed at room temperature for 9 hours under airflow. Thereafter, the mixture was heated to 100 ° C under reduced pressure of 10 mmHg, and excess trimethoxysilane was distilled off to obtain 9,860 g of a colorless transparent liquid having a viscosity of 720 mPa · s and a nonvolatile content of 99.9%. When tetrapropyl titanate was mixed with the obtained liquid in the ratio (mass ratio) of 100: 1, it did not immediately thicken and hardened after 1 day. From this, it was confirmed that methyltrimethoxysilane was added to the vinyl group at the polymer terminal. Moreover, it was about 75% when the introduction rate of trimethoxysilane was measured by ²⁹ Si-NMR. This polymer was referred to as Polymer A.

[Synthesis Example 2]

In a volume 15 liter three-necked flask equipped with a thermometer, a stirrer and a cooler, 10,000 g of α, ω-dimethylvinyl-dimethylpolysiloxane having two vinyl groups in the side chain having a viscosity of 600 mPa · s and 400 g of trimethoxysilane And 4.0 g of a 50% toluene solution of chloroplatinic acid were added as a catalyst and mixed for 9 hours at room temperature under an N ² stream. Thereafter, the mixture was heated to 100 ° C under reduced pressure of 10 mmHg, and toluene as a diluent and excess trimethoxysilane were distilled off to obtain 9,960 g of a colorless transparent liquid having a viscosity of 750 mPa · s and a nonvolatile content of 99.9%. When tetrabutyl titanate was mixed with the obtained liquid in the ratio (mass ratio) of 100: 1, it did not immediately thicken and hardened after 1 day. From this, it was confirmed that methyltrimethoxysilane was added to the vinyl group contained in the polymer. Moreover, it was about 100% when the introduction rate of trimethoxysilane was measured by ²⁹ Si-NMR. This polymer was referred to as Polymer B.

[Synthesis Example 3]

In a 1-liter airtight container, 300 g of γ-glycidoxypropyltrimethoxysilane and 300 g of diisopropoxybis (ethyl acetate) titanium were mixed and aged at 70 ° C for 24 hours under airtight conditions to be pale yellow. A clear liquid was obtained. As a result of ²⁹ Si-NMR measurement of the obtained aging catalyst, it confirmed that the Si peak of (gamma) -glycidoxy propyl trimethoxysilane was cleaved, and it confirmed that the transesterification reaction and the hydrolysis reaction occurred by aging. This aging catalyst was referred to as aging catalyst C.

[Synthesis Example 4]

300 g of γ-glycidoxypropyltrimethoxysilane and 300 g of tetra-tert-butoxytitanium were mixed in a 1-liter closed container, and aged at 70 ° C. for 24 hours under a sealed condition to obtain a pale yellow transparent liquid. . As a result of ²⁹ Si-NMR measurement of the obtained aging catalyst, it confirmed that the Si peak of (gamma) -glycidoxy propyl trimethoxysilane was cleaved, and it confirmed that the transesterification reaction and the hydrolysis reaction occurred by aging. This aging catalyst was referred to as aging catalyst D.

Example 1

100 parts of polymer A and 3 parts of aging catalyst C were mixed until homogeneous under moisture barrier to prepare a composition.

[Example 2]

100 parts of polymer A and 3 parts of aging catalyst D were mixed until homogeneous under moisture barrier to prepare a composition.

[Example 3]

A composition was prepared by mixing 100 parts of polymer B and 3 parts of aging catalyst C until homogeneous under moisture barrier.

Example 4

A composition was prepared by mixing 100 parts of polymer B and 3 parts of aging catalyst D until homogeneous under moisture barrier.

Comparative Example 1

In Example 1, 1.5 parts of (gamma)-glycidoxy propyl trimethoxysilane and 1.5 parts of diisopropoxy bis (ethyl acetate) titanium are added without aging 70 degreeC / 24 hours instead of the aging catalyst C. Other compositions were prepared in the same manner as in Example 1.

Comparative Example 2

Example 2 was replaced with Example 2 except that 1.5 parts of γ-glycidoxypropyltrimethoxysilane and 1.5 parts of tetra-tert-butoxytitanium were added without aging at 70 ° C / 24 hours instead of the aging catalyst D. The composition was prepared in the same manner as.

Various evaluation was performed about the composition of these Examples and the comparative example by the method shown below. These results are shown in Table 1.

[No viscosity time]

The composition was allowed to stand in an atmosphere of 23 ± 2 ° C. and 50 ± 5% RH, and the time until the composition was touched by hand and kept on the fingers was measured.

〔Viscosity〕

The composition was measured by a rotary viscometer at 25 ° C.

[Rubber properties]

The composition was molded into a sheet having a thickness of 2 mm, cured for 7 days in an atmosphere of 23 ± 2 ° C. and 50 ± 5% RH, and its rubber properties (hardness, elongation, tensile strength) were measured according to JIS K6249.

[Adhesiveness]

The composition was applied to a resin adherend having a thickness of 10 × 50 × 2 mm, left at room temperature at 23 ± 2 ° C./50±5% RH for 7 days to form a rubber elastomer, and then the obtained cured product was tensioned to obtain the adherend. Adhesiveness was visually confirmed and evaluated by the following criteria. Here, glass, an epoxy resin, polybutylene terephthalate (PBT), and copper were selected as an adherend.

○: Good, △: Partial peeling, ×: Not possible

[Preservation stability]

The uncured composition was placed in a sealed container, heated in a dryer at 70 ° C. for 7 days, and then the viscosity-free time, viscosity, rubber properties and adhesiveness were measured by the same method as above.

The room temperature curable organopolysiloxane composition of this invention is excellent in quick curing property and adhesiveness, and is excellent in fluidity | liquidity, viscosity stability, and storage stability.

Claims (6)

(A) One or two or more selected from organopolysiloxanes represented by the following Chemical Formulas 1 to 4 and having a viscosity of 50 to 100,000 mPa · s at 25 ° C .: 100 parts by mass, (B) a silane coupling agent selected from (i) a titanium chelate catalyst and / or an organocytitane represented by the following formula (5) and (ii) a (meth) acrylsilane coupling agent and an epoxysilane coupling agent: ii) / (i)] and the aging catalyst which is mixed at a ratio in the range of 0.2 to 5.0 and aged at a temperature in the range of 40 to 100 ° C .: 0.5 to 15 parts by mass Room temperature curable organopolysiloxane composition, comprising a. <Formula 1>

(Wherein R is a methyl group or an ethyl group, R ¹ is an alkyl group having 1 to 10 carbon atoms, a cycloalkyl group, an alkyl group substituted with a halogen atom, a cycloalkyl group substituted with a halogen atom, a vinyl group or a phenyl group, and Y is a carbon atom number) An alkylene group of 1 to 5, p is an integer satisfying the above viscosity of 10 or more, and n is independently 0 or 1.) <Formula 2>

(Wherein R, R ¹ , Y, p and n are as described above and Z is an alkenyl group having 2 to 5 carbon atoms.) <Formula 3>

(Wherein R, R ¹ , Y, p, n are as described above, and R ² is a chemical formula

(Wherein R, R ¹ , Y, and n are the same as described above) and a branched chain containing a hydrolyzable group represented by q, and q is an integer satisfying the viscosity of 1 or more. &Lt; Formula 4 >

(Wherein R, R ¹ , R ² , Y, Z, p, q, n are as described above.) &Lt; Formula 5 > Ti (OR ³ ) ₄ (Wherein R ³ is an alkyl group or alkoxyalkyl group having 2 to 10 carbon atoms) The room temperature curable organopolysiloxane composition according to claim 1, wherein the (ii) silane coupling agent is an epoxy group-containing silane coupling agent. The room temperature curable organopolysiloxane composition according to claim 1 or 2, further comprising 1 to 50 parts by mass of (C) non-reactive silicone oil, based on 100 parts by mass of component (A). The silane compound, a partial hydrolyzate thereof, or a mixture thereof having an average of two or more hydrolyzable groups bonded to the silicon atom (D) in one molecule is 0.5 based on 100 parts by mass of the component (A). The room temperature curable organopolysiloxane composition containing 20-20 mass parts further.  The room temperature curable organopolysiloxane composition according to claim 1 or 2, further comprising 1 to 100 parts by mass of (E) at least one filler based on 100 parts by mass of the component (A). delete