The president and chief executive officer of CPC International Inc., Charles R. Shoemate, also will serve as chairman of the board, the food company announced Wednesday. Shoemate, 50, succeeds James R. Eiszner, who died Sept. 11. Shoemate joined CPC in 1962 and has held positions in manufacturing, finance and management within the consumer foods and corn refining businesses. He became president in October 1988. Based in Englewood Cliffs, CPC had sales of $5.1 billion last year. Among its U.S. brands are Hellmann's mayonnaise, Skippy peanut butter and Mazola corn oil and margarine.