Resin composition for composite-type vibration-damping material, composite-type vibration-damping material using the resin composition and process for production of the vibration-damping material

A resin composition for a composite-type vibration-damping material comprising a composition which comprises a saturated copolyester having a weight average molecular weight of at least 10,000 and a softening point of 50.degree. to 150.degree. C. and a polyfunctional isocyanate compound and which, when cross-linked, has a degree of gelation (degree of cross-linking) of at least 10%, the resin composition further comprising a conductive substance.

A composite-type vibration-damping material comprising an intermediate resin layer which comprises a saturated copolyester having a weight average molecular weight of at least 10,000 and a softening point of 50.degree. to 150.degree. C. and a polyfunctional isocyanate compound and which has a degree of gelation (degree of cross-linking) of at least 10%.

A composite-type vibration-damping material comprising an intermediate layer of a mixture of a resin composition with a conductive substance, the resin composition comprising a saturated copolyester having a weight average molecular weight of at least 10,000 and a softening point of 50.degree. to 150.degree. C. and a polyfunctional isocyanate compound, the resin composition having a degree of gelation (degree of cross-linking) of at least 10%, the conductive substance having a diameter of at least 0.5 times the thickness of the resin layer.

A process for producing a composite-type vibration-damping material which comprises the step of providing, between sheet materials, a mixture obtained by mixing a saturated copolyester having a weight average molecular weight of at least 10,000 and a softening point of 50.degree. to 150.degree. C. with a polyfunctional isocyanate compound so that the mixture, when cross-linked, has a degree of gelation (degree of cross-linking) of at least 10%.

A process for producing a composite-type vibration-damping material which comprises the step of providing, between sheet materials, a mixture obtained by mixing a saturated copolyester having a weight average molecular weight of at least 10,000 and a softening point of 50.degree. to 150.degree. C. with a polyfunctional isocyanate compound so that the mixture, when cross-linked, has a degree of gelation (degree of cross-linking) of at least 10%, and mixing a conductive substance into the mixture of the saturated copolyester and the polyfunctional isocyanate compound.