JPH01153746A - Composition for composite-type vibration-damping material - Google Patents

Abstract

PURPOSE:To obtain the title composition easily formable into a film, which gives, together with a metal, a composite-type vibration damping material having excellent adhesivity, vibration-damping performance, etc., and suitable as a construction material for vehicle, etc., by compounding a specific thermoplastic saturated polyester resin with specific amounts of an acid anhydride and an epoxy resin. CONSTITUTION:The objective composition is produced by compounding 100pts. wt. of a thermoplastic saturated polyester resin having a glass-transition temperature of -30-+60 deg.C and a loss tangent of >=0.5 at the glass-transition temperature with (A) 0.05-1pt.wt., preferably 0.1-1pt.wt. of an acid anhydride (e.g. maleic anhydride) and (B) 0.05-10pts.wt., preferably 0.1-10pts.wt. of an epoxy compound having two or more epoxy groups in 1mol. (e.g. bisphenol A epoxy resin). The molar ratio of epoxy group/acid anhydride group is selected to be 0.5-5, preferably 0.5-4.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a composite vibration damping material composition, and more specifically, it relates to a composite vibration damping material composition that constitutes a component or a part of a vehicle, electrical component, machine or structure. The present invention relates to a composition that is used in the form of a film when producing a composite damping material with high vibration absorption performance that can reduce these vibrations and reduce noise.

[Conventional technology]

In recent years, with the development of transportation systems and the proximity of residences to factories, noise and vibration problems have become a social problem as pollution, and noise and vibration regulations have also been introduced in workplaces to improve the working environment. There is a tendency to In response to these trends, there is a need to provide vibration damping performance to metal materials that are noise sources and vibration sources, and to improve the vibration damping performance.

Therefore, a composite vibration damping material having a three-layer structure in which a viscoelastic intermediate layer made of a viscoelastic resin is sandwiched between two metal layers has been proposed as one of the materials that exhibit such vibration damping performance. For example, automobile oil pans, engine covers, dash board panels and floors, hopper chutes, conveyor equipment stoppers, home appliances, vibration reduction members for other metal processing machines, and structural members of precision machinery where vibration prevention is desired. It has been considered and adopted in other countries.

In this case, the metal materials constituting the two metal layers are:
For example, two metal plates may be used as long as they face each other and can sandwich a viscoelastic resin between them to form a damping material.
Examples include two concentric metal tubes, two steel molds, two molded bodies that can be stacked on top of each other, a metal molded body and a backing plate, and other two-layered structures. and,
The metal forming the metal layer mentioned here is not particularly limited, but usually includes iron, aluminum, copper, lead, or alloys containing these as one component, as well as zinc,
It may also be a metal material plated with tin, chromium, etc., or surface-treated with epoxy resin, melamine resin, etc.

As the viscoelastic resin constituting the viscoelastic intermediate layer of such a composite vibration damping material, polyamide (Japanese Patent Laid-Open No. 56-1
59.160), ethylene-vinyl acetate copolymer (JP-A-57-34,949), polyester resins or resin compositions of polyester-based resins and polyolefin-based resins (JP-A-61-89). Publication No. 842),
Compositions of immiscible non-grade thermoplastic polymers with different glass transition temperatures, such as compositions of vinyl ester or acrylic polymers and styrene polymers (JP-A-60-2
58.262), a composition comprising a non-grade thermoplastic polymer such as a vinyl polymer (Japanese Unexamined Patent Publication No. 61-28, 5
51 Publication), and the present inventors have proposed compositions based on various resin systems, such as a resin composition consisting of a non-grade polyester resin and a low-strength polyester resin (Japanese Patent Application No. 18,160/1982). ing. In addition, polyvinyl butyral or a blend of polyvinyl butyral and polyvinyl acetate mixed with a plasticizer or a tackifying substance (Japanese Patent Publication No. 1983-27,975), a copolymer of isocyanate prepolymer and vinyl monomer ( Special release 512655
4), a composition prepared by mixing a saturated polyester resin with an organic peroxide as a crosslinking agent and a filler (Japanese Patent Publication No. 53-9
, No. 794) has been proposed. Further, resin structures such as olefin resin multilayer bodies (Japanese Patent Application Laid-Open No. 60-82.349) have also been proposed.

By the way, the first characteristic required of such a composite damping material is high vibration allocation performance, which is generally expressed by the magnitude of the loss coefficient. and,
Second, composite damping materials are also used as structural members.
Furthermore, since it is subjected to secondary processing such as press processing, the adhesive strength, especially the shear adhesive strength, between the viscoelastic intermediate layer made of a viscoelastic resin and the outer metal layer is high. In addition, composite vibration damping materials may be used at temperatures around 80°C.
A certain degree of shear adhesive strength at 0°C is also required.

Furthermore, thirdly, the composite vibration damping material subjected to pressing may undergo a baking coating process in which it is heated to about 200°C, and it is also required that the intermediate layer resin composition does not flow out at around this temperature.

On the other hand, methods for manufacturing a composite vibration damping material by compounding a viscoelastic resin and a metal material include a method in which a paint-like material in which a viscoelastic resin is dissolved in a solvent is applied to a metal material and bonded together; Examples include a method of forming an intermediate layer of a viscoelastic resin on a metal material using a die extruder or the like, and a method of sandwiching a film-like viscoelastic resin produced off-line as an intermediate layer between metal materials and hot melt bonding. Each of these methods has its own advantages and disadvantages;
Considering the stability of product management, etc., it is preferable to use a film-like viscoelastic resin.

Formation of such a viscoelastic resin composition into a film is not particularly limited as long as a normal film forming process is used, but it is possible to form a film at a temperature below the temperature at which the melt viscosity of the viscoelastic resin composition causes thermal decomposition. It must have thermoplasticity that decreases to .

In particular, in the case of a damping material that exhibits excellent vibration damping performance in the room temperature range of 0 to 60°C, the glass transition region of the viscoelastic intermediate layer resin composition must be near or below room temperature, and the elastic modulus at room temperature is It has a low composition. On the other hand, compositions exhibiting a high elastic modulus are generally superior in terms of shear adhesive strength, which has an important effect on press workability. In other words, the vibration allocation performance required for a composite vibration damping material and the shear adhesive strength related to press workability are contradictory requirements regarding the elastic modulus of the viscoelastic intermediate layer resin. Composite vibration damping materials manufactured by the company cannot sufficiently satisfy both of these characteristics, and are insufficient as viscoelastic compositions for vibration damping materials. Blends of thermoplastic resins and non-grade thermoplastic resins may have satisfactory vibration damping performance, but are unsatisfactory due to the incompatibility of different polymers, resulting in inferior adhesive strength and mechanical strength. Ta.

In addition, amorphous polyester resin is known to have excellent adhesion to metal materials, but in particular, it has a glass transition temperature that exhibits vibration damping performance at room temperature. In the case of a low resin, the shear adhesive strength does not show a value high enough to withstand press processing, and the material cannot be said to be satisfactory.

Furthermore, even with the composition disclosed in Japanese Patent Publication No. 53-9,794, which consists of a polyester resin, an organic peroxide crosslinking agent, and a filler, although the shear adhesive strength is improved, the resulting distributed material cannot be easily pressed. It does not show a tolerably high value. In addition, it is difficult to control the crosslinking reaction of polyester resin with crosslinking agents that generate radicals such as organic peroxides, and radical reactions occur anywhere in the terminal, main chain, or side chain of the polyester resin. It suppresses molecular movement and has a negative effect on vibration damping performance.

On the other hand, the composition proposed in Japanese Patent Application No. 61-219.160, which consists of a non-grade polyester resin, an acid anhydride, and an epoxy compound, shows excellent vibration damping performance in the room temperature range, and also has excellent shear adhesive strength when pressed. Although this value is high enough to withstand processing, when the amount of acid anhydride and epoxy compound added is large, the fluidity of the resin composition decreases, making it difficult to form a film. In addition, when a high content of acid anhydride or epoxy compound is used, it is necessary to apply a resin composition to the steel plate as a paint type and perform a crosslinking reaction after bonding in the manufacturing process of the composite vibration damping material, which is complicated. It's hard to avoid.

Furthermore, the resin composition made of a blend of non-grade polyester resin and low-strength polyester resin proposed in Japanese Patent Application No. 62-18.160 exhibits sufficient vibration damping performance and shear adhesive strength in the room temperature range. However, the fluidity increases extremely in the high temperature range, and there is a risk that the outer metal layer may open at around 200°C, and the shear bond strength is low at 80°C, making it sufficiently satisfactory as a composite vibration damping material. It wasn't something.

[Problem that the invention seeks to solve]

The present invention was devised in view of this point of view, and can be formed into a film in advance, provides excellent vibration damping performance at room temperature, and has good adhesion to metal materials from room temperature to around 80°C. The object of the present invention is to provide a composition suitable for producing a composite vibration damping material capable of forming a viscoelastic intermediate layer that does not easily flow out even at temperatures near the paint baking temperature.

[Means for solving problems]

That is, in the present invention, 0.05 to 100 parts by weight of an acid anhydride is added to 100 parts by weight of a thermoplastic saturated polyester resin having a glass transition temperature of -30 to 60°C and a loss tangent of 0.5 or more at this glass transition temperature. Less than 1 part by weight, 0 epoxy compounds having 2 or more epoxy groups in 1 molecule
．． 05 to 10 parts by weight of a film composition for producing a composite vibration damping material.

First, the composite vibration damping material in the present invention has a so-called three-layer structure in which two metal layers are sandwiched between them, and a viscoelastic intermediate layer that connects these metal layers to each other, as described at the beginning. Furthermore, a viscoelastic resin composition forming a viscoelastic intermediate layer is formed into a film.

The thermoplastic polyester resin constituting this viscoelastic resin composition exhibits resonance performance at room temperature, and has a rating of -30 to
It is a viscoelastic resin composition having a glass transition temperature of 60°C. When the glass transition temperature is lower than 130°C, the glass transition temperature normally required for a composition for composite vibration damping material is 130°C.
In order to shift the glass transition temperature to ~60°C, it is necessary to add a large amount of high melting point solid resin, filler, etc.
On the other hand, when the temperature is higher than 60°C, it becomes necessary to add a large amount of plasticizer in order to shift the glass transition temperature to a lower temperature side. If a large amount of these various additives is used, it is not preferable because the adhesiveness may deteriorate or the adhesive may become more likely to flow at high temperatures. Further, the loss tangent (tan δ) at this glass transition temperature needs to be 0.5 or more, preferably 0.7 or more from the viewpoint of vibration damping performance. If this loss tangent (tan δ) is smaller than 0.5, satisfactory allocation performance cannot be achieved.

Such saturated polyester resins can be obtained by dissolving highly crystalline saturated polyesters such as polyethylene terephthalate and polybutylene terephthalate in ethylene glycol at high temperature to produce saturated polyhydric alcohols such as triethylene glycol, 1,4-butanediol, and neopentyl glycol. It can be synthesized by adding and transesterifying reaction, or it can also be synthesized by copolymerizing a saturated polyhydric carboxylic acid and a saturated polyhydric alcohol.

The saturated polycarboxylic acid used in the latter synthesis method is
Examples include terephthalic acid, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, diphenyldicarboxylic acid, succinic acid, adipic acid, azelaic acid, sebacic acid, dodecanedioic acid, trimellitic anhydride, etc.
In addition, saturated polyhydric alcohols include ethylene glycol,
1,4-butanediol, 1,5-bentanediol,
1.6-hexanediol, diethylene glycol, triethylene glycol, polyethylene glycol, neopentyl glycol, propylene glycol, 1.4-
Cyclohexane dimetatool, pentaerythritol,
Trimethylolpropane and the like can be mentioned. There are many combinations of these monomers, and they are appropriately selected and used depending on the desired melting point, glass transition temperature, quality, degree of crystallinity, etc.

Moreover, the polyester resin used does not need to be one type, and a composition containing two or more types of polyester resins may be used. In addition, when two or more types are mixed, if they exhibit mutually compatible behavior, the loss tangent of the mixture is 0.5.
Any above is fine. In addition, when two or more types of polyester resins exhibit incompatible behavior, there are two or more local maximum values of the loss tangent of the mixture, but the largest local maximum value among them is 0.
．． It is sufficient to show 5 or more.

Further, in order to improve the distribution performance or the elastic modulus of the selected polyester resin, a resin other than the polyester resin may be mixed with the selected polyester resin.

The resin other than the polyester resin is not particularly limited as long as it can be kneaded with the above polyester resin by a conventional method such as roll kneading, kneader kneading, or extruder kneading. These resins include, for example, styrene resins such as polystyrene, AS resin, ABS resin, MS resin, and impact-resistant polystyrene, and acrylic resins such as polymethyl acrylate, polymethyl methacrylate, polyethyl methacrylate, and acrylic copolymers. , vinyl chloride resins such as polyvinyl chloride, vinyl chloride/vinyl acetate copolymer, vinyl chloride/acrylic acid = 12-ester copolymer, vinyl acetate resins such as polyvinyl acetate, polyvinyl formal, polyvinyl butyral, ethylene・α-olefin copolymers, ethylene/vinyl acetate copolymers, ethylene/acrylic acid copolymers, ethylene/methacrylic acid ester copolymers, ethylene resins such as metal crosslinked ethylene/methacrylic acid copolymers, propylene Examples include propylene-based resins such as ethylene copolymers and propylene-butene copolymers, and thermoplastic resins such as non-grade polyamides such as copolymerized nylon. Also included are elastomers such as styrene-butadiene rubber, natural rubber, butadiene rubber, nitrile rubber, chloroprene rubber, butyl rubber, acrylic rubber, ethylene-acrylic rubber, and EPDM.

In addition, acid anhydrides and epoxy compounds are used together with the saturated polyester resin to improve the shear adhesive strength that affects the press processing of the obtained distributed material. Dodecenyl succinic acid, chlorendic anhydride, sebacic anhydride polymer,
Phthalic anhydride, pyromellitic anhydride, cyclopenkune tetracarboxylic dianhydride, hexahydrophthalic anhydride,
Methylhexahydrophthalic anhydride, tetrahydrophthalic anhydride, endomethylenetetrahydrophthalic anhydride, methylendomethylenetetrahydrophthalic anhydride, 5-
(2,5-dioxotetrahydroxyfuryl)-3-methyl-cyclohexene-1,2-dicarboxylic anhydride,
Examples include melnadisocic anhydride and benzophenonetetracarboxylic anhydride.

These acid anhydrides can be used alone or in combination of two or more, but in order to effectively crosslink the saturated polyester resin and develop excellent shear adhesive strength, at least one acid anhydride is added to the acid anhydride. The component is preferably a polyfunctional compound having two or more acid anhydride groups in one molecule.

In addition, epoxy compounds have two or more epoxy groups in one molecule, and include bisphenol A-based epoxy resins, tetrabromobisphenol A-based epoxy resins, bisphenol F-based epoxy resins, and phenol noborazoqueboxy resins. , brominated phenol novolac epoxy resin, Talesol novolac epoxy resin, tetraglycidyl metaxylene diamine, tetraglycidyl-1°3-bisaminomethylcyclohexane, tetraglycidyldiaminodiphenylmethane, triglycidyl-
Polyfunctional glycidyl amine compounds such as p-aminophenol, triglycidyl-m-aminophenol, diglycidylaniline, diglycidyl orthotoluidine, 1.
Polyfunctional glycidyl ether compounds such as 4-butanediol diglycidyl ether, I+6-hexanesiol diglycidyl ether, ethylene glycol diglycidyl ether, glycerol polyglycidyl ether, sorbitol polyglycidyl ether, phthalic acid diglycidyl ester, hexahydrophthalic acid diglycidyl ether, etc. Examples include glycidyl ester compounds such as glycidyl ester and trimellitic acid polyglycidyl ester.

These epoxy compounds can be used alone or in combination of two or more.

-15= The acid anhydride and epoxy compound are used together with the saturated polyester resin, and the amount used is 0.05 to less than 1 part by weight, more preferably 0 parts by weight, of the acid anhydride per 100 parts by weight of the saturated polyester resin. 0.1 to less than 1 part by weight of an epoxy compound having two or more epoxy groups in one molecule.
The amount is preferably 0.05 to 10 parts by weight, more preferably 0.1 to 10 parts by weight. If the amount of the acid anhydride or epoxy compound is lower than the above lower limit, the adhesive strength, especially the shear adhesive strength, will not improve much, and the effect of adding the compound in the above amount will be small. In addition, acid anhydrides,
When the content of the epoxy compound is higher than the above upper limit, although the shear adhesive strength is markedly improved, the splitting performance is extremely reduced, making it undesirable as a composition for use in producing a splitting material in the form of a film. In addition, thermoplasticity is required for use in film form, and if the acid anhydride or epoxy compound is higher than the above upper limit, the melt viscosity of the composition when heated to high temperatures increases significantly, making it difficult to form a film. It's inappropriate.

In addition, in order to improve the adhesive strength without reducing the vibration damping performance caused by the saturated polyester resin, the amount of acid anhydride and epoxy compound added to the saturated polyester resin is adjusted to improve the molar ratio of epoxy group/acid anhydride group. It is preferably 0.5 to 5, more preferably 0.5 to 4. This optimum blending ratio varies depending on the molecular weight of the saturated polyester resin, the type of terminal functional group, and the types of acid anhydride and epoxy compound used together.

In the composition of the present invention, the functional groups at the terminals of the saturated polyester resin react with acid anhydrides and epoxy compounds, thereby finally being crosslinked and satisfying various physical properties such as adhesive strength and distribution performance. In this crosslinking reaction, it is necessary to select the reaction rate depending on the combination of acid anhydride and epoxy compound used and the mixing state or dispersion state of the composition, and it is also possible to use various catalysts to achieve an appropriate reaction rate. .

Examples of such catalysts include, for example, Zn(BFt)i, 5nCI*, and KO as reaction catalysts for hydroxyl groups and epoxy groups.
For the reaction between a carboxyl group and an epoxy group, or the reaction between an acid anhydride group and an epoxy group, H etc. can be used with tertiary amines such as hensyldimethylamine, tributylamine, tris(dimethylamino)methylphenol, triethylhensyl Quaternary ammonium salts such as ammonium chloride, tetramethylammonium chloride, cetyltrimethylammonium bromide, 2-methyl-4ethylimidazole,
Imidazole compounds such as 2-methylphenol are exemplified.

Further, for the reaction between a hydroxyl group and an acid anhydride group, imidazole compounds, ferric acetylacetone salts, etc. are exemplified.

Further, in order to further improve the shear adhesive strength of the composition of the present invention, an inorganic filler may be added. Such inorganic fillers must not be thermally decomposed at around 200°C, and include carbon black, silica, alumina, clay, titanium oxide, zinc white, mica, graphite, etc. It is desirable to use one or more of carbon black, silica, and clay because it has a great effect of improving adhesive strength.

On the other hand, the amount of inorganic filler added is preferably 1 to 100 parts by weight, particularly 5 to 50 parts by weight, based on 100 parts by weight of the resin. If the amount added is less than 1 part by weight, a sufficient effect of improving the shear adhesive strength will not be obtained, and if the amount added is more than 100 parts by weight, the fluidity of the resin composition will decrease and film forming will become difficult.

It is also possible to add a plasticizer to the resin composition in order to shift the glass transition temperature of the resin composition to a desired value.

Examples of plasticizers used for this purpose include polyester plasticizers, polyether ester plasticizers, phosphate esters, epoxy plasticizers, phthalate diesters,
Examples include ester plasticizers such as diester sebacate, trimellitic acid plasticizers, chlorinated paraffins, etc., and are appropriately selected and used depending on the polyester resin used.

On the other hand, for polyester resins with a low glass transition temperature, it is also possible to shift the peak characteristic temperature to a higher temperature side by adding a substance such as a solid resin having a melting point higher than the glass transition temperature. Examples of such solid resins include alkylphenol resins, terpenephenol resins, rosins, rosin esters, hydrogenated rosin esters, coumaron/indene resins, phenol-modified coumaron resins, and petroleum resins, depending on the polyester resin used. They should be selected and used as appropriate, taking into account the compatibility, etc.

Furthermore, conductivity can be imparted to the viscoelastic composition by blending an electrically conductive solid substance as a filler, and the resulting vibration damping material can be made into a material that can be welded by grooves and grooves. Conductive materials used for this purpose include powdered metals such as stainless steel, zinc, tin, copper, brass, and nickel.
Examples include metal substances processed into flakes, fibers, wires, etc. These conductive substances can be used alone or in combination of two or more. These conductive substances are used to develop good conductivity with metal materials when manufacturing composite vibration damping materials, and to enable more stable spot welding. is preferably softer than the outer layer metal material. If this conductive substance is in powder form, its maximum particle size, if it is in flake form, its maximum thickness, and if it is in fiber form, its maximum diameter is determined by its representative length. (L), in order to obtain better spot weldability, the ratio (L/T) between this representative length (L) and the thickness (T) of the intermediate resin layer of the composite damping material is 0. It is good to set it to 5 or more, preferably 0.8 or more, more preferably 1.0 or more.

The thickness of the film-molded product of the composition of the present invention is appropriately selected depending on the required vibration allocation performance, etc., but from the viewpoint of vibration damping performance, it is preferably 10 μm or more, particularly 20 μm or more. 300 from the viewpoint of workability etc.
It is preferably 200 μm or less, particularly 200 μm or less.

The method of kneading the composition of the present invention is not particularly limited as long as it takes into consideration the dispersibility of the crosslinking agent and inorganic filler into the polyester resin, and is not particularly limited as long as it applies suitable shearing force and temperature. Examples include a pressure-type Niegoo, a Banbury mixer-1 single screw extruder, and a twin screw extruder.

The method for obtaining a film from the composition of the present invention is not particularly limited and may be selected depending on the melt viscosity, elongation, etc. of the resin composition, and may include T-die extrusion molding, inflation molding, calendar molding, real melt coating, etc. Can be mentioned.

Further, when the obtained film has adhesiveness at room temperature, a base material such as release paper or polyolefin may be applied to the film.

There are no particular restrictions on the method for producing a composite vibration damping material using the film obtained from the composition of the present invention, and any method may be used such as a batch method using a cut plate, a continuous method using a coil, etc. can be taken. Furthermore, there are no particular restrictions on the method of bonding the metal material and this film; for example, by sandwiching the film between two metal materials and heat-pressing at a temperature appropriately set depending on the melting temperature of the film. It is possible.

〔Example〕

The present invention will be described below based on Examples and Comparative Examples.

Films to be tested in these Examples and Comparative Examples were produced by the method described below.

The polyester resin shown in Table 1 was put into a pressurized Ni-Goo, and the acid anhydride, epoxy compound, and catalyst shown in Table 1 were sequentially added thereto and kneaded at 100°C to 180°C to obtain a composition. This kneaded product was T-die extruded at a die temperature of 120° C. to 170° C. to form a film with a thickness of 70 μm on release paper.

This film was sandwiched between two cold-rolled steel plates with an opening thickness of 0.8 and heated and pressed at 180° C. for 1 minute to obtain a composite damping material having a viscoelastic resin intermediate layer with a thickness of 70 μm.

T-peel adhesive strength is based on JIS-6854 test method.
Evaluated at a tensile speed of 50 mm/min, and the shear adhesive strength was 5 mm/min based on the JIS-6850 test method.
The allocation performance was evaluated using the mechanical impedance method to measure the loss coefficient (η) representing the vibration absorption ability, and the maximum value of η (η
) was measured and evaluated.

Table 1 shows the results of tests conducted by sandwiching these films between steel plates.

In Comparative Examples 1 to 3, in which neither acid anhydride nor epoxy compound was added to polyester A, or only one of either was added, the shear adhesive strength was 40 to 65 + rf
/c+J, whereas in Examples 1 to 5 in which the acid anhydride and epoxy compound were blended within the above range, the shear adhesive strength was significantly increased to 120 to 150 kgf/cffl. At this time, even if acid anhydride or epoxy compound is added, the vibration damping performance is also the maximum value of the loss coefficient (
η114X) does not decrease to 1.0, and the temperature (Tp) that gives the maximum value of this loss coefficient also increases by only 4 to 5°C.

In addition, Example 6 using two types of saturated polyester resins
Also, the shear adhesive strength was 130krf/- and 25kgf/cd in Comparative Example 5 without addition of acid anhydride or epoxy compound.
The maximum value of the loss coefficient (ηmmx) did not decrease even in terms of allocation performance, and the temperature that gave the maximum value of the loss coefficient ("rp) increased by only 5°C.

On the other hand, in Comparative Example 6, in which the amounts of acid anhydride and epoxy compound added were higher than the above upper limit values, although the mixture could be kneaded with the saturated polyester resin, the fluidity was extremely poor and film formation was impossible.

(The following is a blank space) [Effects of the Invention] The composition of the present invention can be easily formed into a film, and when sandwiched between two metal materials, the resulting composite vibration damping material has excellent adhesive properties and remains stable at around room temperature. It exhibits excellent allocation performance and is extremely useful industrially.

Patent applicant: Nippon Steel Chemical Co., Ltd. Same as above Nippon Steel Corporation Agent: Patent attorney Katsuo Naruse (2 others)

Claims (3)

[Claims] (1) 0.05 to less than 1 acid anhydride is added to 100 parts by weight of a thermoplastic saturated polyester resin having a glass transition temperature of -30 to 60°C and a loss tangent of 0.5 or more at this glass transition temperature. Weight part, epoxy compound having two or more epoxy groups in one molecule from 0.05 to
A composite vibration damping material composition containing 10 parts by weight. (2) Claim 1, characterized in that the acid anhydride and epoxy compound blended into the thermoplastic saturated polyester resin have an epoxy group/acid anhydride group molar ratio of 0.5 to 5. The composite vibration damping material composition described above. (3) The composite according to claims 1 or 2, wherein at least one component of the acid anhydride is a polyfunctional compound having two or more acid anhydride groups in one molecule. Composition for mold vibration damping material.