MEXICO CITY, Nov 15 (Reuters) - Mexican frozen food company Sigma Alimentos, part of Mexican conglomerate Alfa's ALFAA.MX on Friday filed a request for a public offering, Mexico's bourse said in a statement on Friday. Sigma sells well-known brands of meat such as Fud and Nochebuena. The company said on Thursday it had launched a 695 million euro ($932 million) takeover bid for Spanish meat processor Campofrio CPF.MC at a price analysts said could tempt its leading shareholder to sell. Sigma secured commitments from shareholders with 44.5 percent of Campofrio - a household name in Spain - meaning that it now needs to persuade China's Shuanghui International Holdings 1241.HK to part with its 37 percent stake in the firm. ID:nL5N0IZ1ZD (Reporting by Alexandra Alper) ((Alexandra.Alper@thomsonreuters.com)(+5255-5282-7142)(Reuters Messaging: alexandra.alper.thomsonreuters.com@reuters.net)) Keywords: MEXICO SIGMA/