RVIAL TO UNION CARBIDE EMERGES IN FRENCH BID <Carburos Metalicos> of Spain has bid 2,205 francs a share for French chemicals group <Duffour et Igon>, rivalling the 2,100 franc bid announced yesterday by Union Carbide France, the French subsidiary of the U.S. Chemical giant Union Carbide Corp <UK.N>, the stockbrokers' assocation (CSAC) said here. Duffour et Igon's capital is comprised of 133,100 shares with a nominal value of 100 francs each. Shares were last quoted at 856 francs on January 9. Banque Paribas will act for Carburos Metalicos, while Union Carbide France's bid is being led by Rothschild et Associes Banque. Duffour et Igon shares will be suspended on April 6 and 7 and will resume trading on April 8.