May 10, 2005 Mitsubishi Rayon Co., Ltd. Notice Regarding Acquisition of Company Shares (in accordance with the stipulations of Article 211-3, Clause 1, Item 2 of the Commercial Code) On May 10, 2005 the Board of Directors passed a resolution to acquire the Company’s own shares in accordance with the stipulations mentioned above. 1.Reasons for the Purchase Acquisition of Company shares will allow Mitsubishi Rayon to respond more effectively to changes in the business environment. 2. Details of Acquisition (1) Type of shares to be purchased : ordinary shares (2) Maximum number of shares authorized for purchase : 12,000,000 (1.96% of shares issued and outstanding) (3) Maximum amount for use in share purchase : 4,900,000,000 Japanese Yen (4) Period of purchase : May 13, 2005 to June 7, 2005 * Remarks: Shares in treasury as of March 31, 2005 Number of shares issued and outstanding : 611,370,787 Number of shares in treasury : 827,033 For further inquiries, please contact: Public and Investor Relations Office e-mail: koho@mrc.co.jp [PAGE TOP]