Pioneer Announces Conference Call to Discuss Acquisition by Olin


HOUSTON, May 21, 2007 (PRIME NEWSWIRE) -- As previously announced, Pioneer Companies, Inc. (Nasdaq:PONR) and Olin Corporation (NYSE:OLN) have reached a definitive agreement under which Olin will acquire Pioneer. Pioneer will host a conference call to discuss the acquisition by Olin on Tuesday, May 22, 2007 at 10:00 a.m. CDT.

To access the webcast of the conference call, please log on to www.piona.com and go to Investors and then to Conference Calls. To listen to the live webcast, please go to this web site approximately fifteen minutes prior to the start of the call to register, download, and install any necessary audio software. For those unable to participate during the live webcast, a replay will be available shortly after the call on the web site.

Individuals who are interested in listening to the conference call may call (866) 558-6904 at approximately 10:00 a.m. CDT. A telephonic replay will be available from 1:00 p.m. CDT on Tuesday, May 22, 2007 through 10:59 p.m. CDT on Saturday, May 26. To access the replay, please call (888) 203-1112. Please enter the following ID Number: 6191244.

Pioneer, based in Houston, manufactures chlorine, caustic soda, bleach, hydrochloric acid and related products used in a variety of applications, including water treatment, plastics, pulp and paper, detergents, agricultural chemicals, pharmaceuticals and medical disinfectants. Pioneer owns and operates four chlor-alkali plants and several downstream manufacturing facilities in North America.

Certain statements in this news release are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act. Forward-looking statements relate to matters that are not historical facts. Such statements involve risks and uncertainties, including, but not limited to, the cyclical nature of the markets for Pioneer's products and raw materials, the fluctuations in demand and prices for Pioneer's products and raw materials, increases in energy prices, Pioneer's access to and the cost of rail transportation, Pioneer and industry production volumes, competitive prices, and other risks and uncertainties described in Pioneer's filings with the Securities and Exchange Commission. Actual outcomes may vary materially from those indicated by the forward-looking statements.

Important Legal Information

Pioneer intends to file with the SEC a proxy statement and other related documents regarding the proposed transaction described in this communication. WE URGE INVESTORS TO READ THE PROXY STATEMENT AND THE OTHER RELATED DOCUMENTS WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT PIONEER, THE PROPOSED TRANSACTION AND RELATED MATTERS. A definitive proxy statement will be sent to holders of Pioneer's common stock seeking their approval of the proposed transaction. This communication is not a solicitation of a proxy from any security holder of Pioneer.

Investors will be able to obtain the proxy statement and the other related documents (when they become available) and other documents filed with the SEC free of charge at the SEC's website, www.sec.gov. In addition, a copy of the proxy statement (when it becomes available) may be obtained free of charge by directing a request to Pioneer Corporate Office, 700 Louisiana Street, Suite 4300, Houston Texas, 77002, (713) 570-3200 (phone), (713) 225-6475 (fax), Attention: Gary Pittman.

Pioneer, its directors and executive officers and certain other persons may be deemed to be participants in the solicitation of proxies in respect of the proposed transaction. Such persons may have interests in the proposed transaction, including as a result of holding options or shares of Pioneer stock. Information regarding Pioneer's directors and executive officers is available in the proxy statement filed with the SEC by Pioneer on April 19, 2007. Other information regarding the participants in the proxy solicitation and a description of their direct and indirect interests, by security holdings or otherwise, will be contained in the proxy statement and other relevant materials to be filed with the SEC.



            

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