August 5, 2009
Asahi Kasei Chemicals Corp.
Idemitsu Kosan Co., Ltd.
Mitsubishi Chemical Corp.
PS Japan Corp.

Change of proportion of shareholding in PS Japan Corp.
Asahi Kasei Chemicals (Head office, Tokyo; President, Masaki Sakamoto), Idemitsu Kosan (Head office, Tokyo; President, Kazuhisa Nakano), and Mitsubishi Chemical (Head office, Tokyo; President, Yoshimitsu Kobayashi) have reached agreement for the transfer of all the shares held by Mitsubishi Chemical in PS Japan Corp., the joint venture of the three companies for polystyrene operations, to Asahi Kasei Chemicals and Idemitsu Kosan.
1. Proportion of shareholding
Previously Changed to
Asahi Kasei Chemicals - 45.0% Asahi Kasei Chemicals - 62.07%
Idemitsu Kosan - 27.5% Idemitsu Kosan - 37.93%
Mitsubishi Chemical - 27.5%  
  The share transfer will be performed without delay upon completion of all preparations, with October 1, 2009, as a target date.
2. Future of PS Japan
  PS Japan will operate as a joint venture of Asahi Kasei Chemicals and Idemitsu Kosan.
Corporate profile of PS Japan Corp.
President: Nobuyuki Shunaga
Head office: Tokyo
Paid-in capital: ¥5.0 billion (as of March 31, 2009)
Net sales: ¥64.0 billion (for the year ended March 31, 2009)
Capacity: 445 thousand tons/year
Plant location: Chiba, Ichihara, Yokkaichi, and Mizushima


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