JPH06256640A - Curable composition for vibration-damping and sound-insulating material - Google Patents

Abstract

(57) [Summary] [Structure] A curable composition for vibration-damping and sound-insulating materials, which comprises the following 5 components (A) to (E) as essential components; An oxypropylene polymer, (B) a compound having at least two hydrosilyl groups in the molecule, (C) a hydrosilylation catalyst, (D) silica fine powder, and (E) a storage stability improver. [Effect] Excellent vibration damping and mechanical properties.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curable composition which is cured by hydrosilylation. It relates to a composition.

[0002]

2. Description of the Related Art Conventionally, a rubber elastic body having a vibration-damping and sound-insulating property has been used to suppress vibrations and noises of buildings, automobiles, general equipment and the like. However, a well-balanced material that is excellent in mechanical properties in addition to vibration-damping / insulating properties has not yet been developed.

[0003]

DISCLOSURE OF THE INVENTION As a result of intensive studies in view of such circumstances, the present invention solves these problems and provides a vibration damping / insulating material excellent in mechanical properties in addition to vibration damping / insulating properties. It is a thing.

[0004]

That is, the present invention provides a curable composition for vibration damping and sound insulating materials, which comprises the following components (A), (B), (C), (D) and (E) as essential components. Is. (A) Polyoxypropylene polymer having at least one alkenyl group in the molecule, (B) Compound having at least two hydrosilyl groups in the molecule, (C) Hydrosilylation catalyst, (D) Silica fine powder And (E) a storage stability improver.

The polyoxypropylene polymer having at least one alkenyl group in the molecule, which is the component (A) of the present invention, may be linear or branched and has a number average molecular weight of 500 to 50,000. Preferably, 1,
It is more preferably 000 to 20,000. If the number average molecular weight is less than 500, sufficient mechanical properties cannot be obtained when the composition of the present invention is used as a cured product. However, if it is too large, curing is insufficient and sufficient mechanical properties cannot be obtained. Further, when the average molecular weight is 6,000 or more, the degree of dispersion (Mw / Mn) is 1.5 or less, but the viscosity is low before curing and the handling is easy, and the rubbery state after curing is good. It is preferable in that it exhibits elastic behavior. The alkenyl group contained in the polyoxypropylene polymer is not particularly limited, but is represented by the general formula (I)

[0006]

[Chemical 1]

An alkenyl group represented by the formula (wherein R ¹ is hydrogen or a methyl group) is preferable. The component (A) will be described in detail first by referring to the general formula (II).

[0008]

[Chemical 2]

(Wherein R ¹ is hydrogen or a methyl group, R ^{2 is}
Is a divalent hydrocarbon group having 1 to 20 carbon atoms and may contain one or more ether bonds, R ³ is a polyoxypropylene polymer, and a is a positive integer. And a polymer having an ether bond represented by the formula (1). R ²
As specifically,

[0010]

[Chemical 3]

Examples thereof include —CH ₂ —, which is preferable from the viewpoint of ease of synthesis. As a specific example of the component (A), the following general formula (III)

[0012]

[Chemical 4]

(In the formula, R ¹ is hydrogen or a methyl group, and R ^{2 is}
Is a divalent hydrocarbon group having 1 to 20 carbon atoms and may contain one or more ether bonds, R ³ is a polyoxypropylene polymer, and a is a positive integer. The polymer which has the ester bond represented by these is mentioned.
As a specific example of the component (A), the following general formula (IV)

[0014]

[Chemical 5]

(Wherein R ¹ is hydrogen or a methyl group, R ³
Is a polyoxypropylene polymer and a is a positive integer. ). Specific examples of the component (A) include general formula (V)

[0016]

[Chemical 6]

(Wherein R ¹ is hydrogen or a methyl group, R ^{2 is}
Is a divalent hydrocarbon group having 1 to 20 carbon atoms and may contain one or more ether bonds, R ³ is a polyoxypropylene polymer, and a is a positive integer. The polymer which has the carbonate bond represented by these is mentioned.

As the component (A) of the present invention, various methods have been proposed for introducing an alkenyl group into a polyoxypropylene polymer, for example, the terminal, main chain or side chain may be used. Hydroxyl group, a polyoxypropylene-based polymer having a functional group such as an alkoxide group, an active group having reactivity with the functional group, and
By reacting an organic compound having an alkenyl group, the alkenyl group can be introduced into the terminal, main chain or side chain. Examples of the organic compound having an active group and an alkenyl group reactive with the above functional group include C ₃ -C ₂₀ unsaturated such as acrylic acid, methacrylic acid, vinyl acetic acid, acrylic acid chloride, and acrylic acid bromide. Fatty acids, acid halides, acid anhydrides, C ₃ -C ₂₀ unsaturated fatty acid-substituted carbonic acid halides such as allyl chloroformate, allyl bromoformate, allyl chloride, allyl bromide, vinyl (chloromethyl) benzene, allyl (chloro) Methyl) benzene, allyl (bromomethyl) benzene, allyl (chloromethyl) ether, allyl (chloromethoxy) benzene, 1-butenyl (chloromethyl) ether, 1-hexenyl (chloromethoxy) benzene, allyloxy (chloromethyl) benzene, etc. Can be mentioned.

The polyoxypropylene polymer can be obtained by a usual polymerization method of oxypropylene (anionic polymerization using caustic alkali) or a chain extension reaction method using this polymer as a raw material. Polyoxypropylene polymers having a high molecular weight and a narrow molecular weight distribution and having a functional group are disclosed in JP-A-61-197631 and JP-A-61-215622.
No. 61-215623 and 61-218.
632, Japanese Patent Publication No. 46-27250 and Japanese Patent Publication No. 59-
It can be obtained by the method described in 15336 or the like.

The component (B) of the present invention, which is an organic compound having at least two hydrosilyl groups in the molecule, is not particularly limited, but if the group constituting the hydrosilyl group is specifically exemplified,

[0021]

[Chemical 7]

A group containing two silicon atoms such as

[0023]

[Chemical 8]

(In the formula, R is a group selected from H, OSi (CH ₃ ) ₃ and an organic group having 1 to 10 carbon atoms, and each R may be the same or different. Positive integer, and 2 ≦ m + n ≦ 50)

[0025]

[Chemical 9]

(Where R is the same as above, m is a positive integer,
n, p, and q are 0 or a positive integer, and 1 ≦ m + n + p
+ Q ≦ 50)

[0027]

[Chemical 10]

(Where R is the same as above, m is a positive integer,
n is 0 or a positive integer, and examples thereof include groups derived from various polyvalent hydrogen siloxanes represented by various chain-like, branched, cyclic such as 2 ≦ m + n ≦ 50). Among the groups constituting the above various hydrosilyl groups, the molecular weight of the group constituting the hydrosilyl group is 500 because the compatibility of the hydrosilyl group-containing compound of the present invention with the component (A) is less likely to occur. The following are desirable, and the following are preferable in consideration of the reactivity of the hydrosilyl group.

[0029]

[Chemical 11]

(Wherein p is a positive integer, q is 0 or a positive integer, and 2≤p + q≤4)

[0031]

[Chemical 12]

In the component (B) compound of the present invention, when two or more groups constituting a hydrosilyl group are present in the same molecule, they may be the same or different from each other. The total number of hydrosilyl groups contained in the component (B) may be at least two in one molecule, but is preferably 2 to 15 and particularly preferably 3 to 12. When the compound ((B) component) containing a hydrosilyl group of the present invention is mixed with a compound (component (A)) containing an alkenyl group in the presence of a hydrosilylation catalyst to cure by a hydrosilylation reaction, the hydrosilyl group is used. When the number of the groups is less than 2, the curing is slow and the curing failure often occurs. Further, the number of the hydrosilyl group is 1
If it is more than 5, the stability of the curing agent will be poor, and in addition, a large amount of hydrosilyl groups will remain in the cured product after curing, causing voids and cracks.

The hydrosilyl group-containing compound as the component (B) is not particularly limited, but various compounds ranging from low molecular weight compounds to polymers can be used. Illustrating specifically, the general formula (VI)

[0034]

[Chemical 13]

(In the formula, X is a group having at least one hydrosilyl group, and R ¹ , R ² and R ³ are the same as R ¹ , R ² and R ³ in the formula (II). And a is a positive integer.) A compound having an ether bond represented by the general formula (VII)

[0036]

[Chemical 14]

(In the formula, X is a group having at least one hydrosilyl group, and R ¹ , R ² and R ³ are the same as R ¹ , R ² and R ³ in the formula (III). And a is a positive integer.) A compound having an ester bond represented by the general formula (VIII)

[0038]

[Chemical 15]

(In the formula, X is a group having one or more of the above hydrosilyl groups, R ¹ and R ³ are R ¹ in the formula (IV),
The same as R ³ can be used, and a is a positive integer. ), A hydrocarbon-based compound represented by the formula (IX)

[0040]

[Chemical 16]

(In the formula, X is a group having at least one hydrosilyl group, and R ¹ , R ² and R ³ are the same as R ¹ , R ² and R ³ in the formula (V). And a is a positive integer.) A compound having a carbonate bond.

When an organic polymer is used as the component (B), the polymer may be linear or branched and has a molecular weight of 5
Any one of 00 to 50,000 can be preferably used, but one of 500 to 20,000 is particularly preferable.
The hydrosilyl group as the component (B) may be present at the molecular end or in the molecule, but when a rubber-like cured product is produced using the composition of the present invention, it is more effective at the molecular end. This is preferable because the chain length becomes long.

The method for producing the component (B) is not particularly limited, and any method may be used. For example, (i) an organic compound having a Si—Cl group in the molecule is LiAlH ₄ , N
Si—C in the compound after treatment with a reducing agent such as aBH ₄
Method for reducing group l to Si-H group, (ii) reacting an organic compound having a functional group X in the molecule with a compound having a functional group Y reactive with the functional group and a hydrosilyl group in the molecule at the same time And (iii) a method of selectively hydrosilylating a polyhydrosilane compound having at least two hydrosilyl groups with respect to an organic compound having an alkenyl group to leave the hydrosilyl group in the molecule of the compound even after the reaction. Conceivable. Of these (i
The method ii) is particularly preferable.

The hydrosilylation catalyst which is the component (C) of the present invention is not particularly limited and any one can be used. Specifically, simple substance of platinum; solid platinum supported on a carrier such as alumina, silica, carbon black;
Chloroplatinic acid; Complex of chloroplatinic acid with alcohol, aldehyde, ketone, etc .; Platinum-olefin complex {for example, Pt
(CH ₂ = CH ₂ ) ₂ (PPh ₃ ) ₂ , Pt (CH ₂ =
CH _{2) 2} Cl _2}; platinum - vinylsiloxane complex {for _{example, Pt n (ViMe 2 SiOSiMe 2} Vi) m,
Pt [(MeViSiO) _{4] m};} platinum - phosphine complex {for _{example, Pt (PPh 3) 4,} Pt (PBu 3)
₄ }; platinum-phosphite complex (for example, Pt [P (O
Ph) ₃ ] ₄ , Pt [P (OBu ₃ ] ₄ ) (in the formula, Me
Is a methyl group, Bu is a butyl group, Vi is a vinyl group, Ph is a phenyl group, m and n are integers); dicarbonyldichloroplatinum, and Ashby U.S. Pat. Nos. 3,159,601 and 3,159,662. The platinum-hydrocarbon composites described herein, as well as Lamoreaux US Pat. No. 3,209,972.
Also included are the platinum alcoholate catalysts described in the specification. Additionally, the chloroplatinic acid-olefin composites described in Modic US Pat. No. 3,516,946 are also useful in the present invention.

Examples of catalysts other than platinum compounds include RhCl (PPh ₃ ) ₃ , RhCl ₃ and Rh / Al.
₂ O ₃ , RuCl ₃ , IrCl ₃ , FeCl ₃ , AlC
l ₃ , PdCl ₂ · 2H ₂ O, NiCl ₂ , TiCl ₄
And the like (Rh represents a phenyl group). These catalysts may be used alone or in combination of two or more. From the viewpoint of catalytic activity, chloroplatinic acid, platinum-olefin complex, platinum-vinylsiloxane complex and the like are preferable.

The amount of catalyst is not particularly limited, but (A)
10 ^-1 to 10 ^{-8 with} respect to ¹ mol of the alkenyl group in the component
It is preferable to use it in the range of mol. Preferably 10 ^-3 to 1
It is preferably used in the range of 0 ^-6 mol. If it is less than 10 ^-8 mol, curing will not proceed sufficiently. Further, the hydrosilylation catalyst is generally expensive and corrosive, and since a large amount of hydrogen gas may be generated, the cured product may foam.
It is better not to use more than ^-1 mol.

As the fine silica powder which is the component (D) used in the present invention, hydrous silica obtained by a wet process such as hydrolysis of sodium silicate, and heat of a silicon halide such as silicon tetrachloride or an organic silicon compound can be used. Anhydrous silica obtained by a dry production method such as decomposition can be used. Examples of the water-containing silica include Nipseal VN3, Nipseal AQ, Nipseal LP, Nipseal ER, Nipseal NS manufactured by Nippon Silica Industry Co., Ltd.
Nip seal NS-T, Nip seal NA, Nip seal L300, Nip seal N300A, Nip seal E, Santocel FRC of Monsanto,
Santocel CS, PPG Ind Hi-S
il 233, Hi-Sil X303, Philad
Examples include Quso F-20 manufactured by Elphia Quarts.

Examples of anhydrous silica include Aerosil 130, Aerosil 200, Aerosil 200V, Aerosil 200CF, Aerosil 300, Aerosil 300CF, Aerosil 380, Aerosil OX50, Aerosil TT600, Aerosil MOX80, Aerosil MOX170, and Aerosil from Nippon Aerosil Co., Ltd. CO
K84, Aerosil R972, Aerosil R974, Aerosil R202, Aerosil R805, Aerosil R
812, Cab-O-SilMS-5 from Cabot,
Cab-O-Sil MS-7, Cab-O-Sil
HS-5, Cab-O-Sil MS-7 etc. are mentioned. Among these, anhydrous silica is particularly preferable because a side reaction may occur during the curing reaction when the composition contains a large amount of water. Further, the surface of anhydrous silica is hydrophobically treated (for example, Aerosil R972, Aerosil R974, Aerosil R202, Aerosil R80).
5, Aerosil R812, etc.) are preferred.

The amount of the fine silica powder added is 10 parts of the component (A).
It is preferably 1 to 100 parts by weight, and particularly preferably 10 to 60 parts by weight, relative to 0 parts by weight. If the amount added is too small, sufficient strength may not be obtained. On the other hand, if the amount added is too large, there is a risk that the workability will deteriorate due to a large increase in viscosity and that a good cured product will not be obtained.

Examples of the storage stability improver which is the component (E) of the present invention include compounds containing an aliphatic unsaturated bond, organic phosphorus compounds, organic sulfur compounds, nitrogen-containing compounds, tin compounds, organic peroxides. And the like can be preferably used. Specific examples thereof include benzothiazole, thiazole, dimethylmalate, 2-pentenenitrile, and 2,3-dichloropropene, and in particular, thiazole, benzothiazole, and the like in terms of compatibility of pot life / fast curing property.
Dimethylmalate is preferred, but not limited to. The use amount of the storage stability improver can be selected almost arbitrarily as long as it is uniformly dispersed in the component (A) and the component (B), but with respect to 1 mol of the Si-H group-containing compound of the component (B), It is preferably used in the range of 10 ⁻⁶ to 10 ⁻¹ mol. When it is less than 10 ^-6 mol, the storage stability of the component (B) is not sufficiently improved and it is 10 ^-1 m
This is because if it exceeds ol, curing may be hindered.
The storage stability improvers may be used alone or in combination of two or more.

If necessary, other fillers, antioxidants, plasticizers, ultraviolet absorbers, pigments, surfactants, etc. may be added to the composition of the present invention. Specific examples of the other fillers include calcium carbonate,
Examples thereof include clay, talc, titanium oxide, zinc oxide, diatomaceous earth, barium sulfate, and carbon black.

As the method for molding the curable composition of the present invention, various commonly used molding methods can be used. For example, cast molding, compression molding, transfer molding,
Examples thereof include injection molding, extrusion molding, rotational molding, hollow molding, and thermoforming. In particular, injection molding is preferable because it can be automated and continuous and is excellent in productivity. Further, since the curable composition of the present invention is a viscous liquid before being cured, it can be used as a vibration-damping and sound-insulating material by directly applying or pouring it and then curing it.

[0053]

The present invention will be described in more detail based on the following examples, but the invention is not intended to be limited thereto. Synthesis Example 1 According to the method disclosed in JP-A-53-134095,
A polyoxypropylene having an allyl type olefin group at the end was synthesized. Polyoxypropylene glycol having an average molecular weight of 3,000 and powdered caustic soda were stirred at 60 ° C., and bromochloromethane was added to carry out a reaction to increase the molecular weight. Next, add allyl chloride to give 11
The end was allyl etherified at 0 ° C. This was treated with aluminum silicate and purified to synthesize terminal allyl etherified polyoxypropylene. The average molecular weight of this polyether is 7,960, 92% of the end of the iodine value
Was an olefin group. The viscosity by E type viscometer is 13
It was 0 poise (40 ° C.).

Synthesis Example 2 A 200 ml four-necked flask was placed in a cooling tube with a three-way cock,
A pressure equalizing dropping funnel, a thermometer, a magnetic tip, and a glass stopper were attached. Cyclic polyhydrogen siloxane under N ₂ atmosphere

[0055]

[Chemical 17]

(LS8600, manufactured by Shin-Etsu Chemical Co., Ltd.) 1
2.03 g (50 mmol) and 20 ml of toluene were charged into the flask. 1.76 g of 1,9-decadiene
(20 mmol), chloroplatinic acid catalyst solution (H ₂ PtCl
₆ · 6H ₂ O 1g ethanol 1g, dissolved in 1,2-dimethoxyethane 9g solution) 20 [mu] l toluene 3
What was melt | dissolved in 0 ml was prepared in the dropping funnel. The flask was placed in an oil bath at 50 ° C., and the toluene solution was dropped into the flask over 2 hours under N ₂ atmosphere. When the reaction was carried out at 50 ° C for an additional 1 hour after the completion of dropping, the IR
When the spectrum was measured, the absorption of olefin near 1640 cm ^-1 had completely disappeared, so the reaction was terminated at this point. The toluene solution after the reaction was washed with a saturated aqueous solution of ammonium chloride (100 ml × 2) and exchanged water (100 ml × 1), and dried with Na ₂ SO ₄ . Na ₂ SO ₄ was removed by filtration, benzothiazole (13 μl, 0.12 mmol) was added, the volatile matter was removed by evaporation, and then degassed under reduced pressure at 80 ° C. to obtain 9.11 g of a colorless transparent liquid. It was The hydrosilyl group in the hydrocarbon compound was confirmed as a strong absorption at 2170 cm ^-1 . In addition, Si- H in 300 MHz NMR
Than proton intensity ratio between the peak and the Si- CH _3, the compound has the structure of formula average {n = 0 to 2}
It was found to be a mixture. Si-H value is 0.769
It was mol / 100g.

[0057]

[Chemical 18]

Synthesis Example 3 114 g (0.5 mol) of bisphenol A, 250 ml (1.25 mol) of 5N sodium hydroxide aqueous solution and 575 ml of ion-exchanged water were mixed well. Next, benzyltriethylammonium chloride as a phase transfer catalyst.

[0059]

[Chemical 19]

7.78 g (25 mmol) was added. A solution of 242 g (2.0 mol) of allyl bromide in 300 ml of toluene was gradually added dropwise to the aqueous solution from a dropping funnel. The reaction was carried out at 80 ° C. for 2 hours with stirring. At this point, the pH of the water tank was measured and it was found to be acidic, so heating and stirring was stopped. The organic layer was washed with aqueous sodium hydrogen carbonate, washed with ion-exchanged water, and dried over Na ₂ SO ₄ . After removing the volatile matter by evaporation, it was dried under reduced pressure at 80 ° C. for 2 hours to obtain 146 g (yield 95%) of a pale yellow viscous liquid. This viscous liquid was confirmed to be diallyl ether of bisphenol A by identification such as elemental analysis, 300 MHz NMR, and IR spectrum. IR (neat) cm ^-1 , 3070 (m, ν = C-
H), 3030 (m), 2960 (s), 2920
(S), (ν = C−H), 1645 (m, ν = C−)
H), 1620 (s), 1520 (s), 1290
(S), 1235 (s), 1180 (s), 1025
(S), 1000 (s), 920 (s), 825 (s) Elemental analysis, calculated value C, 81.78%; H, 7.8
4% actual value C, 81.90%; H, 7.96%

Synthesis Example 4 A 200 ml four-necked flask equipped with a stirring rod, a dropping funnel, a thermometer, and a cooling tube with a three-way cock was prepared. Next, under a N ₂ atmosphere, cyclic hydrogen polysiloxane

[0062]

[Chemical 20]

(LS8600, manufactured by Shin-Etsu Chemical Co., Ltd.) 1
2.03 g (50 mmol) and 20 ml of toluene were charged into the flask. 6.16 g (20 mmol) of bisphenol A diallyl ether synthesized in Synthesis Example 3 and 1 g of a chloroplatinic acid catalyst solution (H ₂ PtCl ₆ .6H ₂ O) were mixed with ethanol / 1,2-dimethoxyethane (1/9, V /
(V) dissolved in 9 g) 41 μl of toluene 50 ml
It was dissolved in, and mixed well, and then charged into a dropping funnel.
The toluene solution was dropped into the flask at 70 ° C. over 1.5 hours. After reacting at 80 ° C. for 5 hours, I
When the R spectrum was taken, the absorption derived from the olefin at 1645 cm ^-1 had completely disappeared, so the reaction was terminated at this point. Dimethylacetylenedicarboxylate (34 μl, 0.24 mmol) was added to the reaction mixture, toluene was distilled off under reduced pressure, and the residue was dried under reduced pressure at 80 ° C. for 1 hour to obtain 12.0 g of a pale yellow viscous liquid. It was This viscous liquid is 300MHz NM
Identification of R and IR spectra revealed that the compound was an Si-H group-containing ether compound having the following structural formula. The Si-H value was 0.52 mol / 100g.

[0064]

[Chemical 21]

Synthesis Example 5 A 200 ml four-necked flask was equipped with a condenser tube with a three-way cock,
A pressure-equalizing dropping funnel, a thermometer, a rotor and a glass stopper were attached. Cyclic polyhydrogensiloxane under N ₂ atmosphere

[0066]

[Chemical formula 22]

(Shin-Etsu Chemical Co., Ltd., LS8600) 1
2.03 g (50 mmol) and 20 ml of toluene were charged into the flask. Diethylene glycol diallyl carbonate

[0068]

[Chemical formula 23]

(RAV-7N, manufactured by Mitsui Petrochemical Co., Ltd.)
5.49 g (20 mmol), chloroplatinic acid catalyst solution (H
₂ PtCl ₆ .6H ₂ O) 1 g ethanol / 1,2
41 μl of a solution of 9 g of dimethoxyethane (1/9, V / V) dissolved in 50 ml of toluene was charged into the dropping funnel. The flask was placed in an oil bath at 50 ° C., and the toluene solution was dropped into the flask over 1.5 hours under an N ₂ atmosphere. When IR spectrum was measured after completion of dropping, absorption of olefin around 1640 cm ^-1 had completely disappeared, so stirring was stopped at this point. After adding dimethyl acetylenedicarboxylate (34 μl, 0.24 mmol) to the reaction mixture,
By evaporating to remove the volatile matter, 10.2 g of a slightly viscous pale yellow liquid was obtained. The hydrosilyl group of the carbonate compound has an IR spectrum of 2170.
Confirmed as strong absorption at cm ^-1 . Also 300 MHz
By comparing the calculated intensity ratio with the intensity ratio (measured value 0.181) of protons of Si— H peak and Si— CH _{3 in} NMR, the compound should have the structure of the following formula on average. I understood. Si-H value is 0.47 mol /
It was 100 g.

[0070]

[Chemical formula 24]

Examples 1 to 7, Comparative Example Organic polymer obtained in Synthetic Example 1, Si—H group-containing compound obtained in Synthetic Example 2, Synthetic Example 4 or 5, fine silica powder,
Storage stability improver, antioxidant and chloroplatinic acid catalyst solution (H ₂ PtCl ₆ .6H ₂ O 1 g ethanol / 1,
2-Dimethoxyethane (1/9, dissolved in 9 g of V / V) was weighed as shown in Table 1, mixed and then degassed under reduced pressure. A cured product was prepared by curing at 100 ° C. for 10 minutes. According to JISK6301, the dumbbell was pulled and the hardness was measured. Also, soak the cured product in acetone for 2 days,
It was dried at 80 ° C. for 3 hours, and the gel fraction was calculated from the weight loss. Also, the loss tangent at room temperature was measured by dynamic viscoelasticity measurement. The results are shown in Table 2.

[0072]

[Table 1]

[0073]

[Table 2]

[0074]

As is clear from the results shown in Table 2, the curable composition of the present invention can provide a vibration damping and sound insulating material having excellent vibration damping properties and mechanical strength.

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location F16F 15/02 Q9138-3J

Claims (5)

[Claims] 1. The following components (A), (B), (C),
A curable composition for vibration damping and sound insulating materials, which comprises (D) and (E) as essential components. (A) Polyoxypropylene polymer having at least one alkenyl group in the molecule, (B) Compound having at least two hydrosilyl groups in the molecule, (C) Hydrosilylation catalyst, (D) Silica fine powder And (E) a storage stability improver. 2. The curable composition according to claim 1, wherein the polyoxypropylene polymer having at least one alkenyl group in the molecule has a number average molecular weight of 500 to 50,000. 3. The curable composition according to claim 1, wherein the fine silica powder is anhydrous silica. 4. The storage stability improver is dimethyl maleate,
The curable composition according to claim 1, which is at least one kind of dimethyl acetylenedicarboxylate, 2-pentenenitrile, benzothiazole, thiazole, 2,3-dichloropropene, and quinoline. 5. The polyoxypropylene polymer having at least one alkenyl group in the molecule has a number average molecular weight of 6,000 or more and a dispersity (Mw / Mn) of 1.5 or less. The curable composition described.