"The acquisition is part of an effort by Dow to move into the higher-margin specialty chemicals market, which may provide a buffer against ups and downs in basic chemical sales. Specialty chemicals are produced for more specific uses, compared with those produced as high-volume commodities for manufacturing." Source: http://www.msnbc.msn.com/id/25619206/
I think it's a brilliant move. A little expensive on the front end by strong synergies to result. Rohm & Haas has a great reputation for quality products. A jewel in Dow's crown imho. 