JP2700525B2 - Composition for vehicle vibration damping sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composition for a vehicle vibration damping sheet which is excellent in storage stability of a coating material, firmly adheres to a metal coating surface by heating, and is excellent in chipping resistance and vibration damping property. is there.

[0002]

2. Description of the Related Art Conventionally, as a composition for a vehicle damping sheet of a bituminous material type, a composition comprising a bituminous material and an inorganic filler as main components, and a thermosetting resin and a foaming agent added thereto (for example, Japanese Patent Publication No. Hei 4-44899), a composition comprising a hydroxyl group-containing liquid diene polymer, a polyisocyanate compound and a bituminous substance (for example, Japanese Patent Publication No. Hei 4-46225) are known.

[0003]

However, the conventional compositions have insufficient adhesion and chipping resistance to a metal-coated surface, and the composition has a problem in storage stability.

[0004]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above problems, and as a result, by dispersing a specific urethane resin in a bituminous material at a high concentration using a specific dispersant, The present inventors have found that a composition for a vehicle vibration damping sheet having excellent storage stability and firmly adhered to a metal-coated surface by heating to obtain excellent chipping resistance and vibration damping properties can be obtained.

That is, the present invention relates to a bituminous substance (A), a polydiene chain-containing blocked urethane prepolymer (B),
A composition for forming a vehicle damping sheet, comprising an organic polyamine compound (C) and an alkylphenol (D).

As (A) in the present invention, those usually used for this purpose can be used. Specific examples of (A) include petroleum asphalts such as straight asphalt, blown asphalt, semi-blown asphalt, propane (solvent) deasphalted asphalt, petroleum pitch, coal tar and modified products thereof. Of these, particularly preferred are those having a saturated content of 4 in the composition analysis method described in “Asphalt Pocket Book” issued by the Japan Asphalt Association.
0-60% by weight, aromatic content 30-50% by weight, resin 1
It is a bituminous material having a composition of 0% by weight or less and asphaltenes of 5% by weight or less. The amount of (A) used is (A) to (D)
Is usually 10 to 60% by weight, preferably 20 to 50% by weight, based on the total weight of When the use amount of (A) is less than 10% by weight, the viscosity of the composition for a vehicle vibration damping sheet becomes high and coating workability deteriorates, and when it exceeds 60% by weight, the vibration damping property deteriorates.

In the present invention, (B) comprises a polydiene chain-containing urethane prepolymer (B1) and a blocking agent (B).
It is a block body from 2). The diisoanates constituting (B1) include aromatic diisocyanates, aliphatic diisocyanates and alicyclic diisocyanates, and the aromatic diisocyanates include tolylene diisocyanate (TDI), α, α, α ′, α′-tetramethylxylylene. Diisocyanate (TMXDI), diphenylmethane diisocyanate (MDI), naphthylene diisocyanate (NDI), xylylene diisocyanate (XDI), etc .; LDI) and the like; dicyclohexylmethane diisocyanate (HMDI), isophorone diisocyanate (IP
I), 1,4-cyclohexane diisocyanate (CH
DI), hydrogenated xylene diisocyanate (HXDI),
And hydrogenated tolylene diisocyanate (HTDI); and mixtures of two or more thereof. Preferred of these are TDI, HDI, HMDI and IP
DI, particularly preferred are TDI, HMDI and IPDI.

As other polyisocyanates, modified araliphatic, aliphatic, alicyclic or aromatic polyisocyanate compounds can also be used. As a modified product of the polyisocyanate compound, a compound in which a part or all of the isocyanate groups of the compounds exemplified above are modified to a carbodiimide group, a uretdione group, a uretoimine group, a buret group, an isocyanurate group, and two or more kinds of these compounds And mixtures thereof. Preferred among these are burette-modified and isocyanurate-modified polyisocyanates derived from TDI, HDI, HMDI and IPDI.

The polydiene chain-containing polyol constituting (B1) includes a polybutadiene homopolymer having a hydroxyl group at a molecular terminal, a polyisoprene homopolymer, a butadiene-styrene copolymer, a butadiene-isoprene copolymer, a butadiene-acrylonitrile copolymer, and a butadiene-2-ene. Ethylhexyl acrylate copolymer, butadiene-n-octadecyl acrylate copolymer and the like can be mentioned. Particularly preferred among these are polybutadiene polyols. Also, (B
As 1), other known polyols (polyether polyol, polyester polyol, polymer polyol, polycarbonate polyol, polylactone polyol, polyolefin polyol, etc.) can be used together with the above-mentioned polydiene chain-containing polyol.

[0010] The reaction temperature for urethane prepolymerization is usually 50 to 100 ° C. In the reaction of the urethane prepolymer, a known urethane polymerization catalyst (such as dibutyltin dilaurate) can be added to accelerate the reaction.

In the present invention, (B2) used to obtain (B) includes alkylphenol compounds [monoalkylphenol compounds (cresol, ethylphenol, n-propylphenol, n-butylphenol, n-octylphenol, n-nonylphenol) ,
Isopropylphenol, tert-butylphenol, sec-butylphenol, 2-ethylhexylphenol, etc., dialkylphenol compounds (xylenol, di-n-propylphenol, di-n-butylphenol, dioctylphenol, dinonylphenol, diisopropylphenol, di-tert-phenol) Butylphenol, di-sec-butylphenol, di-2-
Ethylhexylphenol, trialkylphenol compounds (trimethylphenol, triethylphenol, etc.); styrenated phenol compounds; allyl compounds [allyl alcohol compounds (allyl alcohol, allyl carbinol, etc.); allyl ether compounds (ethylene glycol monoallyl ether, diethylene glycol) Monoallyl ether, glycerin monoallyl ether, glycerin diallyl ether, trimethylolpropane monoallyl ether, trimethylolpropane diallyl ether, pentaerythritol triallyl ether, diglycerol diallyl ether, etc.); allylphenol compounds (allylphenol, 2-allyl-) 6-
Oxime compounds (acetoxime, methyl ethyl ketoxime, methyl isobutyl ketoxime, etc.), lactams (ε-caprolactam, etc.), active methylene compounds [malonate diester (diethyl malonate, etc.), acetylacetone, acetoacetate ester] (Eg, ethyl acetoacetate)], mercaptans (eg, butyl mercaptan, hexyl mercaptan), acid amides (eg, acetanilide, acrylamide, dimer amide), imidazoles (eg, imidazole, 2-ethylimidazole), and acid imides (Succinimide, phthalimide, etc.); and a mixture of two or more of these. Of these, particularly preferred are oxime compounds and lactams, and particularly preferred are methyl ethyl ketoxime and ε-caprolactam. As the blocking agent having excellent storage stability and obtaining sufficient physical properties after the heat treatment, those having a dissociation temperature for regenerating an isocyanate group, which are usually in the range of 80 to 140 ° C, are preferable.

The amount of (B2) to be added is generally 1-2 equivalents, preferably 1.05-1.5 equivalents, per equivalent of the free isocyanate group of (B1) which is the precursor of (B). .
The reaction temperature for blocking is usually 50 to 100 ° C. In the blocking reaction, a known urethane polymerization catalyst (such as dibutyltin dilaurate) can be added to accelerate the reaction.

As the organic polyamine compound (C) in the present invention, polyethylene polyamine (ethylenediamine, diethylenetriamine, etc.); aromatic polyamine (xylylenediamine, 4,4'-diaminodiphenylmethane, etc.), aliphatic polyamine (hexamethylenediamine) Alicyclic polyamines (4,4'-diaminodicyclohexylmethane, isophoronediamine, 1,
4-diaminocyclohexane, hydrogenated xylylenediamine, hydrogenated tolylenediamine, 3,3′-dimethyl-4,
4′-diaminodicyclohexylmethane, 3,3′-dichloro-4,4′-diaminodicyclohexylmethane,
Isopropylidenedicyclohexyl-4,4′-diamine, etc .; polyoxyalkylene diamine [polyoxypropylene diamine (for example, “Jeffamine D-230” manufactured by Texaco Chemical Co., Ltd., “Jeffamine D-40”
0 ")]]; polyoxyalkylenetriamine @ ethyltris [aminopoly (isopropyloxymethyl)]
Methane (for example, “Jeffamine T-403” manufactured by Texaco Chemical Co., Ltd.) and the like; and a mixture of two or more thereof. Of these, particularly preferred are isophoronediamine and 3,3′-dimethyl-4,4 ′.
-Diaminodicyclohexylmethane, 3,3'-dichloro-4,4'-diaminodicyclohexylmethane, polyoxypropylenediamine and "Jeffamine T-
403 ". The amount of (C) used is 0.9 to 1.1 equivalents, preferably 0.98 to 1.02 equivalents, per equivalent of the regenerated isocyanate group of (B).

The amount of (B) + (C) used in the present invention is usually 20 to 6 based on the total weight of (A) to (D).
0% by weight, preferably 20 to 50% by weight. (B)
If the amount of + (C) used is less than 20% by weight, the vibration damping property becomes insufficient, and if it exceeds 60% by weight, the viscosity of the composition becomes high and the coating workability deteriorates.

The alkylphenol (D) in the present invention
Functions as a dispersant for dispersing (B) and (C) in (A). As (D), an alkylphenol compound [monoalkylphenol compound (cresol, ethylphenol, n-propylphenol, n-
Butylphenol, n-octylphenol, n-nonylphenol, isopropylphenol, tert-butylphenol, sec-butylphenol, 2-ethylhexylphenol, etc., dialkylphenol compounds (xylenol, di-n-propylphenol, di-n-butylphenol, dioctylphenol, Dinonylphenol, diisopropylphenol, di-te
rt-butylphenol, di-sec-butylphenol, di-2-ethylhexylphenol, etc.), trialkylphenol compounds (trimethylphenol, triethylphenol, etc.)]; styrenated phenol compounds, etc .; and mixtures of two or more thereof. Of these, particularly preferred are n-nonylphenol, tert-butylphenol and 3,5-
Xylenol.

Further, an alkylene oxide adduct derived from (D) can also be used. As the alkylene oxide, ethylene oxide, propylene oxide,
Examples include butylene oxide, tetrahydrofuran, styrene oxide, epichlorohydrin, and mixtures of two or more of these. The molecular weight per hydroxyl group of the alkylene oxide adduct of (D) is usually 1,000 or less, preferably 700 or less. The addition reaction temperature is usually 80 to 1
50 ° C. At the time of the addition reaction, a known polymerization catalyst (such as sodium methylate) can be added to accelerate the addition reaction. The amount of (D) used is (A) to (D)
Is usually 1 to 15% by weight, preferably 1 to 10% by weight, based on the total weight of If the amount of (D) used is less than 1% by weight, the dispersion of (B) and (C) with respect to (A) becomes insufficient, and if it exceeds 15% by weight, the vibration damping properties are reduced.

The composition of the present invention may contain a pyrolytic foaming agent (E) to impart foam moldability. The (E) includes azobisformamide, azobisisobutyronitrile, 2,2′-azobis- (2,4
Azo compounds such as -dimethylvaleronitrile), azoazobenzene, diazoaminobenzene, azodicarbonamide, and the like; (paratoluenesulfonylacetone hydrazone, N, N'-dimethyl-N, N'-dinitroso-terephthalamide, N, N N-nitroso compounds such as'-dinitrosopentamethylenetetramine); [benzenesulfonyl hydrazide, paratoluenesulfonyl hydrazide, 4,4'-oxybis (benzenesulfonyl hydrazide), 4-4'-diphenylmethanesulfonyl hydrazide, etc. And the like, and mixtures of two or more thereof. Preferred among these are 4,4'-oxybis (benzenesulfonyl hydrazide) and azodicarbonamide. Although the amount of (E) used is not particularly limited, it is usually 0% based on the total weight of (A) to (D).
-5% by weight, preferably 1-4% by weight.

By using the blocking agent dissociation catalyst (F) in combination with the composition for a vehicle vibration damping sheet of the present invention, the composition can be adhered to a metal-coated surface at a lower baking temperature. Examples of the (F) include potassium or sodium salts of alkyl phosphonic acids; metal salts of fatty acids having 8 to 20 carbon atoms, such as sodium, potassium, nickel, cobalt, cadmium, barium, calcium, and zinc;
Organotin compounds such as dibutyltin dilaurate, dioctyltin maleate, dibutyldibutoxytin, bis (2-ethylhexyl) tin oxide, 1,1,3,3-tetrabutyl-1,3-diacetoxydistannoxane; Mixtures of two or more are mentioned. Particularly preferred among these are dibutyltin dilaurate and dioctyltin maleate. (F) is generally used in an amount of 0 to 5% by weight based on the total weight of (A) to (D),
Preferably it is 0.1 to 3% by weight.

The composition for a vehicle vibration-damping sheet of the present invention may contain a plasticizer (G) if necessary. Examples of (G) include phthalic acid esters such as diethyl phthalate, dibutyl phthalate, dioctyl phthalate, dilauryl phthalate, distearyl phthalate, diisononyl phthalate; adipic acid esters such as dioctyl adipate; sebacic acid esters such as dioctyl sebacate; A phosphoric ester such as rufosphate; an ester-type plasticizer such as 2,2,4-trimethyl-1,3-pentanediol diisobutyrate; and a mixture of two or more thereof. Of these, particularly preferred are dioctyl phthalate and diisononyl phthalate. The use amount of (G) is not particularly limited, but is not more than 40% by weight, preferably not more than 30% by weight based on the total amount of (A) to (D).

[0020] In addition to the above components (A) to (G), various other additives (for example, fillers) can be added to the composition for a vehicle vibration damping sheet of the present invention, if necessary. As fillers, inorganic fillers (calcium carbonate, talc, diatomaceous earth,
Kaolin) and organic fillers (cellulose powder, powdered rubber, recycled rubber, etc.).

When the filler is used as an additive, the amount thereof is not particularly limited, but is usually 0 to 70% by weight, preferably 10 to 60% by weight based on the total amount of (A) to (D).
It is.

In the composition for a vehicle vibration damping sheet of the present invention, the content of each component is not particularly limited, but an example of the formulation is as follows. Usually preferably bituminous substance (A) 10 to 60% by weight (20 to 50% by weight) Blocked urethane prepolymer + organic polyamine compound (B) + (C) 20 to 60% by weight (20 to 50% by weight) Alkyl phenol ( D) 1 to 15% by weight (1 to 10% by weight) Pyrolytic foaming agent (E) 0 to 5% by weight (1 to 4% by weight) Blocking agent dissociation catalyst (F) 0 to 5% by weight (0.1 -3% by weight) Plasticizer (G) 0-40% by weight (1-30% by weight) Filler 0-70% by weight (10-60% by weight)

The composition for a vehicle vibration damping sheet of the present invention can be produced by using a commonly used dispersing kneader or the like, and the mixing method and mixing conditions of each component are not particularly limited.

The composition for a vibration damping sheet of the present invention can be applied to various undercoating surfaces applied to various metal base surfaces and metal (especially steel) surfaces, and can be advantageously applied particularly to cationic electrodeposition coating surfaces. . The coating amount of the composition for a vehicle vibration damping sheet on the painted surface is usually 500 to 3000 g /.
m ² , and the coating thickness is usually 0.2 to ² mm. Examples of the coating method include brush coating, roller coating, and airless spray coating. In addition, a heat treatment is performed after the application, and the temperature in that case is usually 110 to 160 ° C, preferably 120 to 140 ° C, and the time is usually 20 to 4 ° C.
0 minutes. Alternatively, a formed vibration damping sheet having a film thickness of 1 mm to 10 mm can be prepared in advance and attached to a portion of the vehicle where vibration is required.

[0025]

EXAMPLES Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited thereto. In the following, "parts" indicates parts by weight and "%" indicates% by weight.

Production Example 1 [Production of Blocked Urethane Prepomer (B-)] A 1-liter volume 4 equipped with a stirrer, thermometer and nitrogen inlet tube.
Polybutadiene polyol "R-15H"
T "(manufactured by Idemitsu Petrochemical, hydroxyl group content 1.83 meq /
g) 567 parts, 237 parts of isophorone diisocyanate and 1 part of dibutyltin dilaurate were charged and reacted at 90 ° C. for 5 hours under a nitrogen stream to obtain a urethane prepolymer having an NCO content of 5.5%. Subsequently, 96 parts of methyl ethyl ketoxime was added and reacted at 60 ° C. for 1 hour to obtain 900 parts of a blocked urethane polymer (B-).

Production Example 2 [Production of Blocked Urethane Prepomer (B-)] Using the same reactor as in Production Example 1, polybutadiene polyol “R-45HT” (manufactured by Idemitsu Petrochemical Co., Ltd .; 605 parts of polyether polyol "Sannicks Triol TP-400" (manufactured by Sanyo Chemical Industries, molecular weight: 430), 185 parts of disilohexylmethane diisocyanate and 1 part of dibutyltin dilaurate were charged under a nitrogen stream of 95. The reaction was carried out at 5 ° C. for 5 hours to obtain a urethane prepolymer having an NCO content of 3.5%. Subsequently, 64 parts of methyl ethyl ketoxime was added to add 60 parts.
The mixture was reacted at a temperature of 1 hour for 1 hour to obtain 900 parts of a blocked urethane polymer (B-).

Production Example 3 Production of Blocked Urethane Prepomer (B-) Using the same reactor as in Production Example 1, 635 parts of polybutadiene polyol "R-45HT" and 635 parts of polyether polyol "Sannicks Triol TP" −400 ”49
Parts, "Coronate T-80" (manufactured by Nippon Polyurethane Industry, 2,4- and 2,6-tolylene diisocyanate (80/20) mixture, NCO content: 48%), 129 parts, and 1 part of dibutybutyltin dilaurate were charged. The reaction was carried out at 80 ° C. for 5 hours under a nitrogen stream to obtain a urethane prepolymer having an NCO content of 3.8%. Subsequently, 87 parts of ε-caprolactam were added and reacted at 90 ° C. for 4 hours to obtain 900 parts of a blocked urethane prepolymer (B-).

Comparative Production Example 1 [Production of Comparative Blocked Urethane Prepomer (B-)] Using the same reactor as in Production Example 1, polyether polyol "Sanix Diol PP-2000" (Sanyo Chemical Industries, Ltd.) 274 parts, polyether polyol "Sannicks Triol GP-3000"
411 parts (manufactured by Sanyo Chemical Industries, molecular weight 3000), 152 parts of isophorone diisocyanate and 1 part of dibutyltin dilaurate were charged and reacted at 90 ° C. for 5 hours under a nitrogen stream to obtain a urethane prepolymer having an NCO content of 3.4%. Subsequently, 63 parts of methyl ethyl ketoxime were added, and
The mixture was reacted at a temperature of 1 hour for 1 hour to obtain 900 parts of a comparative blocked urethane polymer (B-).

Example 1 Bituminous substance "FR-LA" was placed in a 5 L planetary mixer.
1000 parts (manufactured by Fujikosan) and n-nonylphenol 5
After charging 0 parts and uniformly kneading at room temperature, 900 parts of (B-) obtained in Production Example 1, 89 parts of isophoronediamine and 100 parts of DOP were added and further kneaded at room temperature. Subsequently, 1200 parts of "NCC-110" (manufactured by Nippon Kayaku Kogyo Co., Ltd., calcium carbonate) were dividedly charged and kneaded, and then 33 parts of dibutyltin dilaurate and 27 parts of 4,4'-oxybis (benzenesulfonyl hydrazide) were charged. Kneading,
Vacuum defoaming was performed to prepare a composition for a vehicle vibration damping sheet. The initial viscosity of the composition for a vehicle vibration damping sheet is 300 PS / 25 ° C.
And the viscosity after storage at 40 ° C. for 10 days is 350 PS /
25 ° C. The composition for coating was applied to a steel sheet which had been subjected to cationic electrodeposition coating so that the coating composition had a coating thickness of 0.5 mm 2, and was subjected to a heat treatment at 140 ° C. for 30 minutes. A sheet was obtained, the adhesion to the cationic electrodeposition coating surface was extremely good, and no rust was observed after immersion of the chipping-resistant test piece with a gravelometer in salt water for 3 days. Furthermore, the adhesiveness did not change at all even after immersing this in hot water at 40 ° C. for 10 days. The sheet loss coefficient showing the sheet's vibration damping properties is 2 m
It was 0.35 at 20 ° C. and 0.15 at 60 ° C. for a sheet having a thickness of m. Table 1 shows the results of these performance evaluations.

Example 2 In Example 1, the same amount of (B-) obtained in Production Example 2 was used instead of (B-), and a 2-mol adduct of ethylene oxide of n-nonylphenol was used instead of n-nonylphenol. A composition for a vehicle vibration damping sheet was obtained in the same manner as in Example 1 except that the same amount was used and 83 parts of 3,3′-dimethyl-4,4′-diaminodicyclohexylmethane was used instead of 89 parts of isophoronediamine. . Table 1 shows the performance evaluation results.

Example 3 In Example 1, the same amount of (B-) obtained in Production Example 3 was used instead of (B-), and 114 parts of "Jeffamine T-403" was used instead of 89 parts of isophoronediamine. A composition for a vehicle damping sheet was obtained in the same manner as in Example 1, except that 4,4'-oxybis (benzenesulfonylhydrazide) was not used. Table 1 shows the performance evaluation results.

Comparative Example 1 In Example 1, Comparative Production Example 1 was used instead of (B-).
Using the same amount of (B-) obtained in
A comparative vehicle damping sheet composition was obtained in the same manner as in Example 1 except that the parts were changed to 60 parts. Table 1 also shows the performance evaluation results.

Comparative Example 2 A comparative vehicle damping sheet composition was obtained in the same manner as in Example 1 except that n-nonylphenol was not used. Table 1 also shows the performance evaluation results.

The performance evaluation items and evaluation methods in Table 1 are as follows. Initial viscosity: viscosity immediately after paint preparation (BH type viscometer, PS /
(25 ° C.) Viscosity after storage: 40 ° C. × 10 days after preparation of paint (BH type viscometer, PS / 25 ° C.) Adhesion: 140 ° C. × 30 minutes adhesion to cationic electrodeposition coated steel sheet after baking Adhesion to Cation Electrodeposited Steel Sheet after Baking at 140 ° C. × 30 min and Dipping in Hot Water at 40 ° C. for 10 Days (Cutter Knife Peeling) Tensile Shear Strength: 140 ° C. × 30 Tensile shear strength after partial baking (Kg / cm ² , in accordance with JIS K6850) Shear fracture state: CF; cohesive failure, AF; interfacial delamination Chipping resistance: Gravelo method (stepping stone No. 6, crushed stone 5
(00gr × 5, pressure 5Kg / cm ² , angle 45 °, panel temperature −30 ° C.).
Number of rusting points after immersion for days. Vibration damping: Loss coefficient was determined based on the resonance method “Noise Countermeasures Handbook (published by the Japan Society of Acoustic Materials), p. 438”.
Measured at 〜2.5 mm. Generally, this loss factor is 0.
If it is 05 or more, it is considered that there is a damping effect. Expansion ratio: Each sheet with and without the addition of a heat-decomposable foaming agent was prepared and calculated from the volume difference.

[0036]

[Table 1]

[0037]

The composition for a vehicle vibration damping sheet of the present invention has the following effects. (1) Although it is generally effective to use a foamed material to reduce the weight of a vehicle, the composition of the present invention is resistant to chipping and vibration damping, which indicate vehicle performance. This satisfies both chipping and vibration damping properties. (2) Conventionally, a vinyl chloride resin-based plastisol composition, felt, or the like has been used as a body sealer, an undercoat material, and a vibration damping material of an automobile body. However, the present invention relates to a bituminous substance that is a by-product generated during oil refining. It is expected to be effective for the effective use of chemical by-products and the prevention of global environmental pollution due to acid rain derived from vinyl chloride resin. Due to the above effects, the composition for a vehicle vibration damping sheet of the present invention is extremely useful as a material for a vibration damping material, a body sealer, and an undercoat of a car body in the automotive industry, particularly, to which a cationic electrodeposition coating has been applied. Useful.

──────────────────────────────────────────────────続 き Continuation of front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location D04H 1/58 D04H 1/58 A (56) References JP-A-59-36158 (JP, A) JP-A-63-265934 (JP, A) JP-A-54-3199 (JP, A) JP-A-61-14256 (JP, A) JP-A-58-87118 (JP, A)

Claims (8)

(57) [Claims] 1. A composition for forming a vehicle damping sheet, comprising a bituminous substance (A), a blocked urethane prepolymer containing a polydiene chain (B), an organic polyamine compound (C) and an alkylphenol (D). 2. The composition according to claim 1, wherein the blocking agent (B) is an oxime compound and / or a lactam. 3. The composition according to claim 1, wherein (C) is at least one selected from the group consisting of alicyclic diamines and polyoxypropylene polyamines. 4. A method according to claim 1, wherein (D) is a mono-, di- or trialkyl (C1-18) phenol.
A composition according to any of the preceding claims. 5. Based on the total weight of (A) to (D), (A) is 10 to 60% by weight, and (B) + (C) is 20% by weight.
2 to 60% by weight and (D) 1 to 15% by weight.
The composition according to any one of claims 1 to 4. 6. A thermal decomposition type blowing agent (E) and / or
Or a blocking agent dissociation catalyst (F).
The composition according to any one of claims 1 to 5. 7. A vehicle vibration damping sheet obtained by applying and curing the composition according to claim 1. 8. A foam damping sheet for a vehicle, wherein the composition according to claim 1 is molded and cured in advance.