AMERICAN CYANAMID <ACY> CHANGES RECORD DATE American Cyanamid Co said subject to approval by its board it has changed the record date for the quarterly dividend it will pay on June 26 to May 8 from May 29 to coincide with the record date for a two-for-one stock split that was declared at the same time. The dividend on a post-split basis is 26-1/4 cts per share.