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External Donor Induced Direct Contact Effects on Mg(OC2H5)2-Based Ziegler-Natta Catalysts for Propylene Polymerization |
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| Authors: | Sang Yull Kim Yuichi Hiraoka Toshiaki Taniike Minoru Terano |
| Institution: | 1. School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa, 923-1211, Japan
R & D Center, Samsung Total Petrochemicals Co., Ltd., 411-1 Dokgotri, Daesaneup, Seosansi, Chungnam 356-711, Korea;2. School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa, 923-1211, Japan Tokyo Research Laboratory, Yuki Gosei Kogyo Co. Ltd., 3-37-1 Sakashita, Itabashi-ku, Tokyo 174-0043, Japan;3. School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa, 923-1211, Japan |
| Abstract: | Effects of external donor induced direct contact without alkylaluminum were studied for Ziegler-Natta catalysts containing monoester and diester as internal donors on the catalytic performances such as activity and stereoselectivity. Traditional slurry polymerizations were carried out for rather short period after direct contact for a variety of time. GC analysis was also performed to observe replacement phenomena of donors during direct contact. It was postulated that the different performances of the catalysts were greatly affected by the pair of internal and external donors. |
| Keywords: | activation direct contact internal and external donors propylene polymerization Ziegler-Natta catalyst |