Imperial Chemical will sell part of Stauffer.

Imperial Chemical Industries PLC of London said it will sell the specialty chemicals part of its soon-to-be-acquired Stauffer Chemical Co. to the Dutch chemical group Akzo NV for $625 million. British-based ICI, the world’s fifth-largest chemical company, said its main purpose in acquiring Stauffer, based in Westport, Conn., was to broaden its agriculture chemicals business in the United States.