| 摘要 |
<p>A chromate-free resin-composite type vibration deadening material excellent in durable bondability having a multilayer structure comprised of a viscoelastic resin composition sandwiched between metal sheets as an intermediate layer, characterized by that: (i) the viscoelastic resin composition is a thermosetting resin comprised of an amorphous copolymerizable polyester resin and a curing agent and (ii) the surfaces of the metal sheets on the sides contacting the viscoelastic resin layer are provided with chromate-free bonding undercoats comprising 5 mass% to 50 mass% of silica, 5 mass% to 50 mass% of a polyester resin, 1 mass% to 50 mass% of tannic acid, and 0 mass% to 30 mass% of a silane coupling agent.</p> |
