VISCOELASTIC COMPOSITION FOR VIBRATION-DAMPING METAL PLATE

摘要

PURPOSE:To provide a viscoelastic composition composed mainly of a rubber component having unsaturated bond, a (meth)acrylic acid metal salt and a polymerizable monomer and capable of giving a vibration-damping metal plate having excellent post-formability by sandwiching the composition between a pair of metal plates and curing and integrating the components. CONSTITUTION:A viscoelastic composition having a viscosity of =10,000 poise at 30 deg.C under a shearing rate of 1,000/sec is produced by compounding (A) 100pts.wt. of a natural or synthetic rubber having unsaturated bond in the molecule with (B) 1-90pts.wt. of a (meth)acrylic acid metal salt (e.g. zinc acrylate), (C) 25-200pts.wt. of a polymerizable monomer other than the component B (e.g. acrylic acid ester), (D) a tackifier (e.g. rosin) and (E) 0.1-10pts.wt. of a hardening catalyst (e.g. methyl ethyl ketone peroxide). The viscoelastic composition is sandwiched between a pair of metal plates and integrated to the plate by thermal curing to obtain a vibration-damping metal plate containing a hardened composition having a specific physical property as an intermediate layer.