The Dow Chemical Company has reach a tentative agreement to purchase Rohm & Haas Company on terms similar to the $78 a share agreed upon in July, according to The Wall Street Journal. The settlement came hours before a deadline set by a Delaware judge in a suit brought against Dow Chemical by Rohm & Haas for failing to complete the transaction in January, the newspaper said. In late January, Dow put the deal on hold due to concerns over funding and the difficult economy....