Nippon Kokan Kabushiki Kaisha

Mazda Motor Corporation

Mitsubishi Petrochemical Company Limited

Yukichi Watanabe

Masahide Ochiumi

Akira Itsubo

Shinji Horie

Masahiro Dohi

Hiroshi Kodama

Masafumi Yoshida

Tomeji Doi

Hidekazu Tsubone

Norio Chiba

Kunio Kawasaki

Yoshitaka Takamiya

Norihiro Sekizuka

A vibration-damping composite sheet steel made by sandwiching a viscoelastic material between two steel sheets. A rust proofing coating which generates no gaseous matter is formed on one surface of each of the steel sheets which is contacted with the viscoelastic material. The coating is a phosphate coating having no water of crystallization with a coating weight per unit area of 0.5 g/m.sup.2 or over, or a galvanized zinc coating including no zinc oxide.

Vibration-damping composite sheet steel

A vibration-damping resin composition of the invention comprises 10 to 95% by weight of an amorphous thermoplastic resin polymer (a) and 90 to 5% by weight of a crystalline thermoplastic polymer (b) incompatible with the polymer (a). The polymer (a) has a glass transition temperature lower than that of the polymer (b) and a maximum tan.delta. of 0.5 or more within a predetermined temperature and frequency range. The polymer (b) has a melting point higher than the glass transition temperature of the polymer (a) and a shear storage modulus of 1.times.10.sup.8 dyne/cm.sup.2 or more at the temperature and frequency at which the polymer (a) exhibits the maximum tan.delta..

Vibration-damping composite metal plate

Growing community of inventors

Yokohama, Japan

Yukichi Watanabe