International Paper estimates contributions for 2006

International Paper Co., Stamford, Conn., estimated it might have to contribute $40 million to $200 million to its pension plan in 2007, according to its 8-K filing. Last month in an SEC filing, the company said it planned to contribute between $500 million and $1 billion to its pension fund this year. The plan has $6.9 billion in assets and was underfunded by $2 billion as of Dec. 31. Robert Hunkeler, vice president of investments, could not be reached by press time for comment.