FRANKFURT, Germany - Celanese AG has completed the previously announced sale of its 46% stake in the fluoropolymer manufacturer Dyneon to 3M Co., part of the company's plan to focus on core businesses. Celanese, an independent company created as the result of a spinoff by Hoechst AG in 1999, also has sold its 50% stake in the Targor polypropylene joint venture to venture partner BASF AG.