RESIN COMPOSITION FOR COMPOSITE VIBRATION DAMPING MATERIAL AND COMPOSITE VIBRATION DAMPING MATERIAL PRODUCED THEREFROM

摘要

A resin composition for composite vibration damping material, which comprises 100 parts by weight of a base resin composed of at least 20 wt % of a conjugated diene/vinyl aromatic hydrocarbon block copolymer modified with a functional vinyl compound and at most 80 wt % of a vinyl aromatic hydrocarbon polymer composed of a vinyl aromatic hydrocarbon and a functional vinyl compound, 10 to 150 parts by weight of a tackifying resin with a softening point of 160 DEG C or below, and 0.01 to 40 parts by weight of a cross-linking agent capable of reacting with the functional group of the vinyl compound in the base resin; and a metallic vibration damping material produced by sandwiching the resin composition as a viscoelastic intermediate layer between two metallic layers spaced apart from each other at a given distance as a metallic material. The produced composite material is excellent in vibration damping not only in an ordinary temperature range from a low temperature to an ordinary temperature but also in a high-temperature range up to about 100 DEG C, has a viscoelastic intermediate layer which hardly bleeds out even near the temperature for baking a coating material, and is endowed with excellent water and oil resistances.