Does anybody know, is this deal going to strengthen Dow, or will it be a step too far with its other commitments around the world? 

"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.