Kuraray Chemical Co., Ltd.

Panasonic Corporation

Honda Giken Kogyo Kabushiki Kaisha

Takanori Kitamura

Shuji Saiki

Hideharu Iwasaki

Toshiyuki Matsumura

Shigeki Oyama

Takeshi Fujino

Akira Miyake

Satoshi Koura

Yoshimichi Kajihara

Takayuki Yamada

Shushi Nishimura

Tetsuya Hanamoto

Nozomu Sugo

Yoshifumi Egawa

Susumu Abe

Shizuo Ishimura

Yuji Kawabuchi

Teruhiro Okada

Tatsuo Morotomi

Tsuyoshi Kowaka

Yoshiharu Fukunishi

Kengo Tabata

A material for improving the sound pressure level at the bass reproduction limit of the present invention is composed of an activated carbon having a cumulative pore volume of 0.4 ml/g or more for the pores each having a radius of 50 angstroms or less. Preferably, this activated carbon has a cumulative pore volume of 0.1 ml/g or less for the pores each having a radius of 7 angstroms or less. In particular, when a sound pressure level improving material in which the activated carbon has a cumulative pore volume of 0.5 ml/g or more for the pores each having a radius of 18 angstroms or less is installed in a cabinet of a loudspeaker device, the material alleviates pressure fluctuations of a gas within the cabinet caused by vibration of a loudspeaker, and thus a very good bass reproduction effect is attained. Moreover, in the case where a sound pressure level improving material in which the activated carbon has a cumulative pore volume of 0.4 ml/g or more for the pores each having a radius of 18 to 50 angstroms is installed in the cabinet, a loudspeaker device having a good bass reproduction effect even in an atmosphere of high humidity is obtained.

Material for speaker device and speaker device using it

The present invention provides an evaporated fuel gas adsorbent, an evaporated fuel gas trapping apparatus that uses the adsorbent, an activated carbon, and a process for producing the activated carbon. The evaporated fuel gas adsorbent is capable of improving adsorptivity and desorptivity by reliably preventing a temperature rise and a temperature fall caused by heat generated in response to the adsorption and desorption of evaporated fuel gas, is capable of achieving a size reduction of the device, and is capable of being easily produced. The activated carbon has high mechanical strength and high abrasive resistance, has many pores suitable to adsorb an organic solvent, especially, evaporated fuel gas, and has a high packing density. The activated-carbon producing process is industrially advantageous.

Evaporated fuel gas adsorbent, evaporated fuel gas trapping apparatus, active carbon and process for producing the same

Activated carbon useful as polarizable electrode material for an electric double-layer capacitor can be obtained by mixing a carbonaceous material and an alkali metal hydroxide while maintaining a solid state, granulating the obtained mixture while maintaining its solid state, dehydrating the obtained granulated substance while maintaining its solid state, and subjecting the granulated dehydration product obtained in the dehydration step to an activation treatment. The preferred pressure of the granulation treatment in the granulation step is 0.01 to 300 Torr, and the preferred temperature of the granulation treatment is 90 to 140&#xb0; C. The preferred pressure of the dehydration treatment in the dehydration step is 0.01 to 10 Torr, and the preferred temperature of the dehydration treatment is 200 to 400&#xb0; C.

Method for manufacturing activated carbon, polarizable electrode, and electric double-layered capacitor

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Bizen, Japan

Takanori Kitamura