A judge refused to dismiss a Union Carbide suit.

U.S. District Judge Jose A. Cabranes in New Haven, Conn., denied a motion by GAF Corp. to dismiss or transfer a lawsuit filed by Union Carbide seeking to block GAF’s proposed $4.3-billion hostile takeover of the giant chemical company. He said GAF had not shown that enough “factual overlap” existed to make the case a counterclaim to GAF’s own lawsuit against Carbide being heard in New York.