Mitsubishi Gas Chemical Company, Inc.

Kazuaki Mukasa

Yuuki Sato

Takuya Minezaki

Takeo Hayashi

Takao Ota

Masayuki Daito

Yohei Abiko

Shuya Suenaga

Satoshi Yoshinaka

Shinji Sekiguchi

Aoi Daito

Teruhisa Matsumaru

Akifumi Tiba

Kenji Harada

Provided is a polyimide resin composition and a production method thereof, wherein the polyimide resin composition contains an alicyclic polyimide resin having a structural unit represented by the following general formula (1) and inorganic particles of at least one selected from the group consisting of titanium dioxide, barium titanate, and zirconium oxide, wherein the alicyclic polyimide resin has a glass transition temperature of 260&#xb0; C. or higher, 

Polyimide resin composition, method for producing same, and polyimide film

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 &#x3bc;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 &#x3bc;m, and (III) Elongation at failure point of the resin composition measured according to JIS K7127 is in the range of 30 to 70%.

Vibration-damping film

A resin composition for a vibration damping material, comprising a polyester resin mainly formed of a dicarboxylic acid constitutional unit and a diol constitutional unit; and a filler, in which the polyester resin contains: a dicarboxylic acid constitutional unit (A) mainly derived from an aromatic dicarboxylic acid, in particular, isophthalic acid; a diol constitutional unit (B) mainly derived from ethylene glycol; and a constitutional unit (C) formed of an aliphatic dicarboxylic acid, an aliphatic diol, and/or an aliphatic hydroxycarboxylic acid each having 5 or more carbon atoms, and the resin composition contains, as the filler, a flake-like or plate-like filler (D) and a filler (E) made of a particulate metal oxide.

Vibration damping material

Provided is a vibration damping material comprising: a polyester resin containing dicarboxylic acid constitutional units and diol constitutional units; and mica being dispersed in the polyester resin, wherein: (1) a ratio [(A+B)/(A+B)] of a total of (A) a number of the dicarboxylic acid constitutional units having an odd number of carbon atoms in a polyester main chain and (B) a number of the diol constitutional units having an odd number of carbon atoms in the polyester main chain with respect to a total of (A) a number of total dicarboxylic acid constitutional units and (B) a number of total diol constitutional units in the polyester resin is in the range of 0.5 to 1; and (2) an average particle diameter calculated from a volume-based particle diameter frequency distribution of the mica in the vibration damping material is 25 to 500 &#x3bc;m. The damping material has a high versatility, is lightweight, shows an excellent vibration damping property and can be produced easily with a batch mixer.

Damping material and method for production thereof

Provided is a vibration damping material, which includes a resin composition obtained by dispersing titanium dioxide (Y) and a mica flake (Z) in a polyester resin (X) containing dicarboxylic acid constitutional units an diol constitutional units, in which: (1) in the polyester resin (X), a ratio of a total of a number of the dicarboxylic acid constitutional units (A) having an odd number of carbon atoms in a main chain and a number of the diol constitutional units (B) having an odd number of carbon atoms in a main chain with respect to a total of a number of total dicarboxylic acid constitutional units (A) and a number of total diol constitutional units (B), i.e., [(A1+B1)/(A+B)] is in a range of 0.5 to 1; and (2) a mass ratio (X:Y:Z) of the polyester resin (X), the titanium dioxide (Y), and the mica flake (Z) is in a range of 15 to 40:5 to 30:30 to 80. The vibration damping material is light, has a high vibration damping ability, and exhibits a higher vibration damping ability in a particularly wide range of frequency. Because the vibration damping material does not require use of a carbon powder or the like, the material can also be used in applications and parts that require various color tones, and has high versatility.

Vibration-damping material

Growing community of inventors

Kanagawa, Japan

Kazuaki Mukasa