Rohm and Haas (Philadelphia; 215-592-3054), has reached a definitive agreement to acquire Morton International Inc. (Chicago), in a cash and stock deal valued at $4.9 billion, including the assumption of $268 million of net debt. When completed, the deal will create a global specialty chemical company with combined annual revenues of $6.5 billion and new international leadership positions in adhesives, specialty coatings, electronic materials, and salt.