Abstract: Vibration damping film comprising a composition obtained by dispersing titanium dioxide (Y) and mica flakes (Z) in a polyester resin (X) comprising dicarboxylic acid units and diol units, satisfying conditions (I) to (III), and having a thickness in the range of 20 to 200 ?m : (I) Content of polyester resin (X), titanium dioxide (Y) and mica flakes (Z) in the composition is in the range of 35 to 60% by mass, in the range of 5 to 15% by mass and in the range of 30 to 55% by mass, respectively, (II) Average particle diameter of the mica flakes (Z) in the resin composition is in the range of 5 to 80 ?m, and (III) Elongation at failure point of the resin composition measured according to JIS K7127 is in the range of 30 to 70%.

Abstract: There are provided a cyanate ester resin composition for highly multilayered printed wiring boards for high-frequency applications which exhibits excellent heat resistance and dielectric characteristics and which can yield moldings with an excellent surface appearance, a prepreg prepared using the same, and a metal foil-clad laminated sheet. The resin composition comprises (a) a cyanate ester resin having two or more cyanate groups in the molecule, (b) a bisphenol A epoxy resin having two or more epoxy groups in the molecule, (c) a novolak epoxy resin having two or more epoxy groups in the molecule, (d) a brominated polycarbonate oligomer, (e) a low polymer of styrene and/or a substituted styrene, (f) spherical silica particles having a mean particle diameter of 3 ?m or less, and (g) a wetting and dispersing agent.

Abstract: A molding material containing a vibration damping material composed of a resin composition of a polyester resin composed of a dicarboxylic acid component constituent unit and a diol component constituent unit having titanium dioxide and a mica flake dispersed therein; and a modifier for improving fluidity. A ratio of a total sum of a number of the dicarboxylic acid component having an odd carbon atom number in a main chain thereof and a number of the diol component having an odd carbon atom number in a main chain thereof to a total sum of a number of all dicarboxylic acid components and a number of all diol components is in the range of from 0.5 to 1.0; in the vibration damping material, a mass ratio of the polyester resin, the titanium dioxide and the mica flake is in the range of (15 to 40):(5 to 30):(30 to 80).

Abstract: Vibration damping film comprising a composition obtained by dispersing titanium dioxide (Y) and mica flakes (Z) in a polyester resin (X) comprising dicarboxylic acid units and diol units, satisfying conditions (I) to (III), and having a thickness in the range of 20 to 200 ?m : (I) Content of polyester resin (X), titanium dioxide (Y) and mica flakes (Z) in the composition is in the range of 35 to 60% by mass, in the range of 5 to 15% by mass and in the range of 30 to 55% by mass, respectively, (II) Average particle diameter of the mica flakes (Z) in the resin composition is in the range of 5 to 80 ?m, and (III) Elongation at failure point of the resin composition measured according to JIS K7127 is in the range of 30 to 70%.