JPH0813907B2 - Rubber composition for anti-vibration / sound-proof / sound-insulating material - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rubber composition which is used by being crosslinked or crosslinked and foamed into a predetermined shape in hot air. More specifically, the rubber composition before crosslinking is a resin. , Rubber, wood, metal, paper, cloth, concrete stones, etc. have excellent adhesive and adhesive properties, shape-following property, and the crosslinked body or crosslinked foam after crosslinking has the above structure. The present invention relates to a rubber composition for a vibration-proof / sound-proof / sound-insulating material, which has excellent adhesive strength, shape-following property, cushioning property, sound-proof property, sound-absorbing property, sound-insulating property and vibration-proof property.

[Prior Art] Synthetic rubber, natural rubber, 1,2-polybutadiene, and ethylene-vinyl acetate copolymer are used as rubber components of crosslinked products and crosslinked foamed products. It is known to be lightweight and elastic. These crosslinked products and crosslinked foams have been produced by a method of crosslinking or crosslinking and foaming in a mold.

As a new technology, a method of producing a crosslinked body and a crosslinked foam by hot air crosslinking without using a mold has attracted attention,
It is used in the vehicle field. In this method, a composition having properties such as sound insulation, vibration insulation, and sound insulation, which is a mixture of natural rubber and synthetic rubber with a cross-linking agent, is formed into a sheet, and the composition is attached to a steel plate which is a body material of a vehicle and heated to form a sheet. A crosslinked body or a crosslinked foamed body is formed by crosslinking or foaming the material. In this method, the properties required for the sheet-like material and the crosslinked product or the crosslinked foam are viscoadhesiveness to a steel sheet, shape following property and void filling property in the crosslinked foam. If it is inferior, the settability on the steel sheet is poor, the workability is significantly reduced, and the application is limited.

However, the conventional materials having sound insulation, vibration-proofing and sound-proofing properties made of natural rubber or synthetic rubber are rubber compositions before cross-linking and cross-linked products or cross-linked foams after hot air cross-linking are structures such as steel plates. On the other hand, the adhesiveness and the shape-following property were inferior, so that the settability to the structure was inferior, which was a cause of a decrease in operability. Further, in the crosslinked foam, the foaming property is poor, and therefore the void filling property is inferior, and improvements thereof have been desired.

In recent years, many structures have been treated with oils,
This is a cause of further worsening the tackiness and adhesion, and there is a need for a material having excellent tackiness and adhesion even for a structure surface-treated with these oils.

[Problems to be Solved by the Invention] The present invention improves the adhesiveness and shape-following properties, which are the above-mentioned problems, and further has excellent cushioning properties, soundproofing properties, sound absorbing properties, sound insulating properties, and vibration damping properties. And a rubber composition for a vibration-proof / sound-proof / sound-insulating material, which obtains a crosslinked body or a crosslinked foam having excellent void filling properties.

[Means for Solving the Problem] The present invention relates to A. At least one kind selected from natural rubber and synthetic rubber 60
To 90% by weight, B.1,2-polybutadiene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, block copolymer of aromatic vinyl compound and conjugated diene compound, and hydrogenated products thereof C. Inorganic filling based on 100 parts by weight of a mixture [(A) + (B)] containing at least 10 to 40% by weight of at least one selected from the group consisting of anionomer, modified acid anhydride of polyolefin, and modified carboxylate of polyolefin. Agent 95 to 500 parts by weight D. Softener 95 to 500 parts by weight E. Crosslinking agent 1 to 50 parts by weight F. Foaming agent 0 to 100 parts by weight A rubber composition for vibration, sound and sound insulation materials is provided. It is a thing.

The component (A) of the present invention is at least one selected from natural rubber and synthetic rubber, and examples of the synthetic rubber include polyisoprene rubber (IR) and styrene-butadiene rubber (SB
R), polybutadiene rubber (BR), acrylonitrile
Diene synthetic rubber such as butadiene rubber (NBR) and chloroprene rubber (CR) and ethylene-propylene rubber (EP
R), ethylene-propylene-non-conjugated diene rubber (EPD
M), isobutylene-isoprene rubber (IIR), acrylic rubber (ACM, ANM), non-diene synthetic rubber such as fluororubber. Furthermore, among these synthetic rubbers, those of low molecular weight, such as liquid BR, liquid EPR, liquid EPDM, liquid SB
Suitable synthetic rubbers include R, liquid NBR, liquid butene, liquid IR, and liquid 1,2-polybutadiene. Of these, natural rubber, IR, SBR, BR, IIR and EPDM are preferable.

The Mooney viscosity of natural rubber is preferably 60 M _{L 1 + 4} (100
℃) or less. A preferred synthetic rubber is a styrene-butadiene emulsion copolymer having a Mooney viscosity of 30 to 65M.
_{L 1 + 4} (100 ℃), polybutadiene (BR) with cis content of 94% or more and Mooney viscosity of 25 to 45M _{L 1 + 4} (100 ℃)
Rubber having an unsaturation degree of 0.5 to 2.5% in an isobutylene-isoprene copolymer and an Mooney viscosity of 40 to 120 _{ML 1 + 4} (100 ° C.) in an ethylene-propylene-diene copolymer.

 The amount of component (A) used is 60 to 90% by weight.

The component (A) imparts viscous adhesion to a structure, especially a structure surface-treated with oils, and shape conformability, and further imparts excellent foamability to the crosslinked foam. When the amount of the component (A) is less than 50% by weight, the tackiness and the shape following property are poor.

Examples of the component (B) of the present invention include 1,2-polybutadiene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, copolymer of aromatic vinyl compound and conjugated diene compound, and hydrogenation thereof. Compounds, ionomers, modified products of acid anhydrides of polyolefins, and modified products of carboxy of polyolefins. Of these, preferred are 1,2-polybutadiene, copolymers of aromatic vinyl compounds and conjugated diene compounds, particularly block copolymers and acid-modified polyolefins.

The 1,2-polybutadiene has a 1,2 bond content of 70% or more, preferably 85% or more, and a crystallinity of 5%.
As described above, it is preferably 10 to 40%. Further, the molecular weight can be selected over a wide range, but in order to obtain a kneading processability and a crosslinked foam which is the object of the present invention, [η]
(Toluene, 30 ° C.) is preferably 0.5 dl / gr or more. The block copolymer of an aromatic vinyl compound and a conjugated diene compound is, for example, a compound represented by the general formula (AB) nA, (AB)
n or {(AB) n} mX It is a block copolymer represented by.

The aromatic vinyl compound content is preferably 7 to 90% by weight, more preferably 10 to 70% by weight, and the molecular weight is 10,000 or more and 1,000,000 or less, more preferably 70,000 or more 3.
By using the amount of 0,000 or less, a more excellent object of the present invention can be obtained, and particularly a highly foamed rubber composition for sound insulation can be obtained.

As the aromatic vinyl compound, styrene, α-methylstyrene, ortho, meta, para-substituted methylstyrene,
Examples include ethylstyrene, methoxystyrene, dimethylaminostyrene, isopropylstyrene, pt-butylstyrene, and the like. Of these, styrene, paramethylstyrene, and α-methylstyrene are preferable. Examples of the polymer include a polymer of only one kind among these monomers, or a block or random copolymer in which two or more kinds are combined.

The conjugated diene (co) polymer block or the hydrogenated polymer block of the conjugated diene (co) polymer may be a homopolymer of butadiene, isoprene or piperylene, or a block or random copolymer of two or more kinds in combination, or a part thereof. Examples thereof include copolymers in which aromatic vinyl compounds are arranged randomly or in taper block and hydrogenated polymers of these conjugated diene polymers.

In order to obtain a more excellent crosslinked product or crosslinked foamed product of the present invention, it is preferable to use styrene as the aromatic vinyl compound and butadiene and / or isoprene as the conjugated diene compound.

The component (B) of the present invention has the effect of further improving the shape-following property, tackiness, and foaming property.

The amount of the component (B) used is 10 to 40% by weight. 50% by weight
When it exceeds, the shape following property is deteriorated, which is not preferable. The foamability of the foam exhibits an excellent effect when the amount of the component (B) used is 10% by weight or more.

Examples of the inorganic filler as the component (C) of the present invention include light calcium carbonate, heavy calcium carbonate, various surface-treated calcium carbonates, talc, magnesium hydroxide, mica, clay, barium sulfate, natural silicic acid, and synthetic. Silicic acid, titanium oxide, glass fiber, carbon fiber, cotton floc, and various carbon blacks can be used. Of these inorganic fillers, heavy calcium carbonate, light calcium carbonate and talc are economically advantageous and preferred.

The preferable average particle diameter of the component (C) is 0.01 to 10 μm. When the component (C) having this average particle size is used, the foamability and strength are further improved.

The amount of component (C) used is [(A) + (B)] component 100
It is 95 to 500 parts by weight, preferably 100 to 300 parts by weight, based on parts by weight. If it is less than 95 parts by weight, the kneading property for obtaining the rubber composition, the appearance of the crosslinked foam and the vibration damping property of the crosslinked product are inferior, and the rubber composition becomes expensive. . If it exceeds 500 parts by weight, the visco-adhesiveness, sound insulation, sound absorption and foamability are impaired, and the strength is further lowered, which is not preferable.

The (D) component softener used in the present invention includes mineral oil-based softeners generally called process oils or extender oils, and a mixture of three aromatic ring, naphthene ring and paraffin ring is used. Preferably, paraffinic chains have more than 50% of the total carbons are called paraffinic, naphthene ring carbons with 30-45% are naphthenic, and aromatic carbons are more than 30%. Things are said to be aromatic.

The mineral oil-based softening agent for rubber used as the component (D) of the present invention is preferably a naphthene-based or aromatic-based softening agent in the above category from the viewpoint of compatibility with the components (A) and (B). Other preferred softening agents include bituminous materials such as atactic polypropylene and asphalt.

The blending amount of the softener as the component (D) is the same as that of the component [(A) +
(B)] 95 to 500 parts by weight, preferably 10 to 100 parts by weight
0 to 300 parts by weight. If it is less than 95 parts by weight, the foaming property, tackiness and the like will be impaired, and if it is more than 500 parts by weight, the kneading processability will be significantly deteriorated.

The crosslinking agent as the component (E) used in the present invention is a combination of sulfur or a compound that produces sulfur by heating and a vulcanization accelerator, an organic peroxide, and the like. Even without using a cross-linking agent, the method of cross-linking by irradiating with ultraviolet rays or X-ray electron beams,
The object of the present invention is obtained.

As the sulfur, powdered sulfur, precipitated sulfur, colloidal sulfur, surface-treated sulfur and the like can be used. As the compound that generates sulfur by heating, tetramethylthiuram disulfide, tetraethylthiuram disulfide and the like can be used.

The blending amount of the component (E) is 100 [component (A) + (B)].
It is 1 to 50 parts by weight, preferably 3 to 30 parts by weight with respect to parts by weight. If the amount is less than 1 part by weight, the degree of crosslinking is insufficient and the foam cells are destroyed, resulting in poor sound insulation and sound absorption, and a high foam cannot be obtained. If it exceeds 50 parts by weight, the degree of cross-linking becomes too high to obtain a high-foamed body, so that there is a problem that sound insulation and sound absorption are inferior.

Examples of the vulcanization accelerator used in combination with sulfur or a compound that produces sulfur by heating include tetramethylthiuram disulfide (TMTD), tetramethylthiuram monosulfide (TMTM), and N-oxydiethylene-2-benzothiazolyl sulfene. Amide (OBS), N-cyclohexyl-2-benzothiazyl sulfenamide (CB
S), dibenzothiazyl disulfide (MBTS), 2-mercaptobenzothiazole (MBT), zinc di-n-butyl dicarbite (ZnBDC), zinc dimethyldithiocarbite (ZnMDC) and the like.

In the case of blending with organic peroxide, dicumyl peroxide, di-t-butylperoxy-3,3,5-trimethylcyclohexane, α, α′-di-t-butylperoxydi p-diisopropylbenzene, n -Butyl-4,4-bis-t-butylperoxyvalerate, t-butylperoxybenzoate, t-butylperoxyisopropyl carbonate, 2,5-dimethyl-2,5-di (t-butylperoxy) ) Hexane etc. can be used.

In the case of peroxide crosslinking, various polyfunctional monomers may be added at the same time.

Specific examples of the polyfunctional monomer include trimethylolpropane trimethacrylate, ethylene glycol dimethacrylate, triallyl isocyanurate, diallyl phthalate and the like.

Further, if necessary, in addition to the above-mentioned additives, various additives such as an activator, an anti-aging agent and a processing aid may be appropriately added to the sulfur crosslinking composition and the peroxide crosslinking composition.

As the foaming agent of the component (F) used in the present invention, known inorganic or organic foaming agents can be used. It is also possible to use them together.

Specific examples of the foaming agent include sodium bicarbonate, ammonium bicarbonate, sodium carbonate, ammonium carbonate, azodicarbonamide (ADCA), dinitrosopentamethylenetetramine (DNPT), dinitrosoterephthalamide,
Examples thereof include azobisisobutyronitrile, barium azodicarboxylic acid, sulfonyl hydrazide, and toluene sulfonyl hydrazide. These foaming agents may be used in combination with known foaming aids such as urea and urea derivatives. Of these, preferred is a combined use system of azodicarbonamide and / or dinitrosopentamethylenetetramine and a foaming aid such as urea or a urea derivative.

The amount of the foaming agent used as the component (F) is the same as that of the component [(A) +
(B)] 0 to 100 parts by weight relative to 100 parts by weight. When the non-foamed crosslinked product is intended, the component (F) is 0 part by weight, and when the crosslinked foamed product is intended, preferably 1 part. To 100 parts by weight, more preferably 5 to 70 parts by weight, particularly preferably 10 to
It is 50 parts by weight. If the blowing agent exceeds 100 parts by weight,
A large amount of gas is generated by the decomposition of the foaming agent, and a foam having a good appearance cannot be obtained. The non-foamed crosslinked product has sound insulation and sound absorption properties, but is particularly excellent as a vibration isolator because it has excellent vibration isolation properties.

It is also possible to add a pressure-sensitive adhesive to this component to improve the tackiness and adhesion performance.

Examples of the adhesive include rosin-based resins, terpene-based resins, coumarone-indene-based resins, aliphatic and aromatic petroleum resins, and epoxy resins.

The method of mixing the above-mentioned (A) to (F) and other compounding agents is not particularly limited, and can be a mixing method used for general rubber compounds such as Banbury type mixer, pressure kneader and open roll. is there.

The uncrosslinked compound thus obtained is molded into, for example, a sheet shape using a calendar roll, an extruder or the like, and then subjected to crosslinking or crosslinking foaming in a heat medium such as hot air. Cross-linking or cross-linking foaming temperature is 120-250
Crosslinking is carried out by heating in hot air at a temperature of 140 ° C, preferably 140 to 180 ° C. At this time, it is not necessary to pressurize, and it is possible to perform crosslinking under atmospheric pressure. At the time of this cross-linking or cross-linking and foaming, a structure such as a wooden mold, a clay mold, or a mold is formed into a desired shape, and the non-cross-linked sheet is placed on the mold to soften the non-cross-linked sheet by heat. It is possible to follow the shape of the mold and obtain the desired shape. It is also possible to firmly crosslink and adhere to the mold without using an adhesive, a pressure sensitive adhesive or the like at the time of crosslinking or crosslinking and foaming. Also, because vulcanization is performed in a heat medium such as hot air,
It does not require expensive dies or pressing equipment, and can also bridge long objects that cannot be obtained by conventional die vulcanization.

The rubber composition for cross-linking or cross-linking foaming of the present invention is suitable as a sound insulating material, a sound insulating material, a vibration damping material, a vibration damping material, and as other uses, various running, industrial products, automobile interior materials, road material building materials, daily necessities. It can also be widely used in sports equipment, toys, etc.

Further, in the above application, even if the material of the partner to be complexed or contacted is treated with oils, etc., and the environment of the site of use is low to high temperature, the rubber composition and the rubber composition of the present invention can be used in a wide temperature range. The crosslinked product or the crosslinked foamed product has excellent adhesiveness to the material of the partner to be composited. The material of the material to be contacted is not particularly fixed, and for example, resin, rubber, metal, wood,
Paper, cloth, concrete, stone, etc. can be used.

The shape of the material may be, for example, a face piece, a solid body, a dot body, a rod body, a line body, a spiral body, a sphere body, a concave body, a convex body, and combinations and / or combinations thereof.

EXAMPLES Next, the present invention will be described more specifically by showing Examples and Comparative Examples, but the scope of the present invention is not limited by the Examples.

In Examples and Comparative Examples, each physical property was measured by the following methods.

(1) Foaming Ratio A method of dividing the sponge thickness after foaming by the sheet thickness before foaming was used.

(Judgment) ◎ 15 times or more ○ 11 to 14 times △ 6 to 10 times × less than 6 times (2) Appearance (Judgment) ◎ The sponge surface is smooth without unevenness.

○ Some gas vent holes are found on the sponge surface.

△ Concavities and convexities are conspicuous on the sponge surface due to outgassing.

× Unevenness, large deformation.

(3) Oil-treated metal plate adhesive strength Anti-rust oil is applied to a metal plate (applied three times using oil-impregnated gauze in a state where oil does not drip) to treat oil, and an uncrosslinked sheet is then applied. Then, the metal-uncrosslinked sheet structure was stood vertically and dropped onto concrete from a height of 0.5 m, 1 m, and 2 m to evaluate the tackiness of the metal-uncrosslinked sheet.

(Judgment) ◎ Drops vertically from a height of 2 m without peeling.

○ Drops vertically from a height of 1 m without peeling.

△ There is no peeling when dropped vertically from a height of 0.5m.

× Drop vertically from a height of 0.5 m to peel off.

(4) Sound absorption characteristics α Based on JIS A1405 normal incidence sound absorption coefficient measurement method. The concept of the measuring device is shown in the following schematic diagram.

Calculation of sound absorption coefficient α = 1-Ir / Ii = (Ii-Ir) / Ii Ii: Incident sound intensity Ir: Reflected sound intensity (judgment) 500Hz 1000Hz ○ 0.3 or more 0.4 or more △ 0.2 to 0.29 0.3 to 0.39 x less than 0.2 less than 0.3 (5) Sound transmission loss TL (dB) (an index of sound insulation)
JIS A 1416-1974 Compliant with the sound transmission loss measurement method in the laboratory.

The measuring device is composed of two reverberation chambers sandwiching the sample mounting opening, a sound source device and a receiving device.

(Calculation of sound transmission loss) The sound transmission loss of the sample was calculated by the following equation.

T _L = L ₁ −L ₂ T _L : Room sound pressure level difference (dB) L ₁ : Reverberation room average sound pressure level for sound source (dB) L ₂ : Sound reception 〃 (dB) (judgment) ○ 200 Hz In case of 10 (dB) or more △ 7 to 9 (dB) × 6 (dB) or less ○ In case of 1000 Hz 15 (dB) or more △ 13 to 14 (dB) × 12 (dB) or less (6) Shape following ability 150 mm , Width 100mm, thickness 1mm steel plate, 30 °, 45
A sample was processed into a chevron shape having apex angles of °, 60 °, 90 °, and 120 °, and a sample was placed on the apex angle portion, and the state in which the sample fits the apex angle was traced.

Sample shape: length 100 mm, width 50 mm, thickness 2 mm.

(Judgment) ◎ Fits all angles, and there is no abnormality in the appearance shape of the sample.

○ Fits at an angle of 45 ° to 120 °, and there is no abnormality in the appearance of the sample.

△ Fits at an angle of 90 ° to 120 °, and there is no abnormality in the appearance of the sample.

× Does not fit 120 °. If you force it to fit, it will crack.

(7) Kneading processability Cohesiveness of compound during kneading under pressure kneader (judgment) ○ Good, good dispersibility △ Long time required, dispersibility is somewhat poor × No kneading (8) Vibration isolation characteristics JIS M329-83 5 ・ 10 Compliant with anti-vibration.

That is, on the test plate of 200 × 20 mm, the vertical and horizontal directions of the sample sheet of 170 × 20 mm are aligned, respectively, after opening by 30 mm from one end of the test plate made of steel plate and baking, and then allowed to cool to room temperature. The thing is used as a test piece. Next, the end of the test plate on which the sample is not baked is firmly fixed to the tester. A current of 130 to 140Hz is applied to the electromagnetic exciter to cause the plate to resonate, and the frequency at which the amplitude of the plate becomes maximum is measured. Then the amplitude on both sides Measure the frequency at the point where The vibration isolation coefficient is calculated by the following equation.

Where d: anti-vibration coefficient f ₀ : frequency of resonance point Hz f ₁ , f ₂ : amplitude of peak value at common point on both sides of resonance point Frequency f f ₂ > f ₁ (judgment for practical use) d = 0.4 or more (◯), d = 0.4 to 0.3 (△), less than 0.3 (x) [Examples 1, 2, 3, 4] Example 1, Nos. 2, 3, and 4 are cross-linking compounds using a compound that generates sulfur when heated.

At the compounding ratio shown in Table 1, the polymer, the crosslinking aid, the dispersant, the crosslinking agent, and the foaming agent are placed in this order in a pressure kneader at a temperature of 40 to 70 ° C. and prekneaded. Next, an inorganic filler and an adhesive are added and preliminary kneading is performed. Then add oils little by little and knead. After sufficiently kneading, a sheet having a shape of 240 mm × 240 mm × 2 mm was formed at room temperature by a 145 ton press, and crosslinked and foamed in an atmosphere of 120 to 220 ° C. for 30 minutes. The results of the properties of the sheet and crosslinked foam are shown in Table 2. The crosslinked foam object of the present invention has been obtained.

[Examples 5, 6, 7] Examples 5, 6, 7 are peroxide cross-linking formulations.

Evaluation was carried out by the same method as in Example 1. The compounding recipe is shown in Table-1 and the evaluation result is shown in Table-2. The crosslinked foam object of the present invention has been obtained.

[Example 8] Example 8 is an example of a non-foamed crosslinked product that does not use a foam, and the compounding formulation and the crosslinking conditions are shown in Table 1, and the evaluation results are shown in Table 2. The crosslinked product aimed at by the present invention is obtained.

[Examples 9, 10 and 11] Examples 9, 10 and 11 are examples in which liquid rubber was used as the rubber component. The compounding formulation and the crosslinking conditions are shown in Table 5, and the evaluation results are shown in Table 6. A crosslinked product and a crosslinked foamed product intended by the present invention are obtained.

[Comparative Examples 1 to 10] Using the compounding recipes shown in Table 3, compounding, molding and evaluation were carried out by the method shown in Example 1.

Comparative Examples 1 and 2 In this example, the components (A) are both below the range of the present invention, and the shape following property is poor.

Comparative Examples 3 and 10 Comparative Example 3 is an example in which the component (D) is less than the range of the present invention, and is inferior in shape followability, adhesiveness, kneadability, sound insulation and sound absorption. On the other hand, Comparative Example 10 was an example in which the component (D) exceeded the range of the present invention, and kneading was impossible.

Comparative Examples 4 and 5 Comparative Example 4 is an example in which the component (C) exceeds the range of the present invention, and the adhesiveness, sound insulation, sound absorption and kneading properties are poor. on the other hand,
Comparative Example 5 is an example in which the component (C) is less than the range of the present invention,
Kneadability and foam appearance are inferior.

Comparative Examples 6 and 7 Comparative Example 6 is an example in which the cross-linking agent of the component (E) is less than the range of the present invention and is inferior in foamability, foam appearance, sound insulation and sound absorption. On the other hand, Comparative Example 7 is an example in which the component (E) exceeds the range of the present invention, and the foam has poor appearance, sound insulation and sound absorption.

Comparative Examples 8 and 9 Comparative Example 8 is an example in which the inorganic filler of the component (C) and the softening agent of the component (D) are less than the scope of the present invention, and the appearance and kneadability of the foam are poor. On the other hand, Comparative Example 9 is an example in which the component (F) exceeded the range of the present invention, and abnormal foaming occurred, and a crosslinked foam could not be obtained.

[Effects of the Invention] The rubber composition of the present invention does not require a mold at the time of cross-linking, exhibits sufficient cross-linking or cross-linking foamability even when cross-linked by hot air, and is a resin or rubber that is a mating structure. ,wood,
Even if a structure such as metal, paper, cloth, concrete, stone, etc. and the structure is surface-treated with oils, the rubber composition and the crosslinked body or the crosslinked foam are both excellent in tackiness and shape conformability. Is also excellent. Further, the crosslinked body and the crosslinked foam are
It has excellent cushioning properties, soundproofing properties, sound absorbing properties, sound insulating properties, and vibration damping properties, and is particularly excellent as a filler for filling voids such as gaps in crosslinked foams.

Since the composition of the present invention has such excellent properties, it is suitable as a vibration damping material, a sound absorbing material, a sound insulating material, a sound insulating material, and as other uses, various linings, daily necessities, industrial products, building materials, It can be widely used for flooring materials, carpet lining materials, sports equipment, automobile interior materials, road materials, toys, etc.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 61-138644 (JP, A) JP 61-4745 (JP, A)

Claims (2)

[Claims] 1. A. 60 to 90% by weight of at least one selected from natural rubber and synthetic rubber, B.1,2-polybutadiene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, and aroma. Block copolymers of group vinyl compounds and conjugated diene compounds and their hydrogenated products, ionomers, acid anhydride modified products of polyolefins, and carboxy modified products of polyolefins, and at least one selected from 10 to 40% by weight. C. Inorganic filler 95 to 500 parts by weight D. Softener 95 to 500 parts by weight E. Crosslinking agent 1 to 50 parts by weight F. Foaming agent 0 to 100 per 100 parts by weight of the mixture [(A) + (B)] Rubber composition for anti-vibration / sound-proofing / sound-insulating materials that contains parts by weight. 2. A rubber composition for a vibration-proof / sound-proof / sound-insulating material according to claim 1, wherein (F) is from 1 to 100 parts by weight.