| JPS50108384A              (xx)* | 1974-02-01 | 1975-08-26 |  |  | 
| JPS5144190A              (ja)* | 1974-10-15 | 1976-04-15 | Tokuyama Soda Kk | Ryushijohoripuropiren mataha puropiren * echirenkyojugotaino seizohoho | 
| US4111834A              (en)* | 1975-05-28 | 1978-09-05 | Imperial Chemical Industries Limited | Process for preparing a transition metal compound and it's use as a component in an olefin polymerization catalyst | 
| JPS537786A              (en)* | 1976-07-09 | 1978-01-24 | Sumitomo Chem Co Ltd | Preparation of propylene polymer or copolymer | 
| JPS5490094A              (en)* | 1977-12-28 | 1979-07-17 | Toyo Sutoufuaa Kemikaru Yuugen | Titanium trichloride catalyst component and monoo or copolymerization of alphaaolefin | 
| US4258161A              (en)* | 1978-02-14 | 1981-03-24 | Mitsubishi Chemical Industries Ltd. | Process for polymerizing propylene | 
| US4222893A              (en)* | 1978-04-03 | 1980-09-16 | Standard Oil Company (Indiana) | Process for forming high performance titanium trichloride olefin polymerization catalyst components | 
| JPS598362B2              (ja)* | 1978-06-23 | 1984-02-24 | 有限会社東洋ストウフア−・ケミカル | α−オレフイン重合用触媒 | 
| US4543400A              (en)* | 1978-09-26 | 1985-09-24 | Exxon Research & Engineering Co. | Titanium trichloride catalyst component and the process for the production thereof | 
| US4211670A              (en)* | 1979-01-25 | 1980-07-08 | Hercules Incorporated | Titanium trichloride catalyst component for propylene polymerization | 
| US4262104A              (en)* | 1979-02-12 | 1981-04-14 | Exxon Research & Engineering Co. | Titanium trichloride catalyst complex and process for the production thereof | 
| US4395358A              (en)* | 1979-02-12 | 1983-07-26 | Exxon Research & Engineering Co. | Titanium trichloride catalyst complex and process for the production thereof | 
| EP0019312B1              (en)* | 1979-04-30 | 1983-08-17 | Shell Internationale Researchmaatschappij B.V. | Olefin polymerization catalyst compositions and a process for the polymerization of olefins employing such compositions | 
| CA1141093A              (en)* | 1979-05-17 | 1983-02-08 | Brian L. Goodall | Olefin polymerization catalyst compositions and a  process for the polymerization of olefins  employing such compositions | 
| EP0021753B1              (en)* | 1979-06-20 | 1984-03-14 | Sumitomo Chemical Company, Limited | Method for production of highly crystalline olefin polymers | 
| JPS591723B2              (ja)* | 1980-01-17 | 1984-01-13 | チッソ株式会社 | α−オレフイン重合体を製造する方法 | 
| JPS5928573B2              (ja)* | 1980-02-05 | 1984-07-13 | チッソ株式会社 | α−オレフイン重合体の製造方法 | 
| JPS6023764B2              (ja)* | 1980-02-27 | 1985-06-10 | チッソ株式会社 | α−オレフイン重合体を製造する方法 | 
| JPS5759902A              (en)* | 1980-09-29 | 1982-04-10 | Chisso Corp | Preparation of alpha-olefinic polymer | 
| GB2114581B              (en)* | 1981-12-17 | 1985-08-14 | Chisso Corp | Ziegler catalyst for producing polypropylene | 
| JPS58219207A              (ja)* | 1982-06-15 | 1983-12-20 | Chisso Corp | 高剛性高溶融粘弾性ポリプロピレンとその製造法 | 
| US4525467A              (en)* | 1984-01-16 | 1985-06-25 | Exxon Research & Engineering Co. | High efficiency polymerization catalyst component for use in the polymerization of propylene and higher alpha-olefins | 
| IT1173452B              (it)* | 1984-03-20 | 1987-06-24 | Montedison Spa | Componenti e catalizzatori per la polimerizzazione delle olefine | 
| GB8521431D0              (en)* | 1985-08-28 | 1985-10-02 | Shell Int Research | Spherical magnesium alkoxide particles | 
| US4914069A              (en)* | 1987-05-04 | 1990-04-03 | Shell Oil Company | Preparation of olefin polymerization catalyst component | 
| US4948770A              (en)* | 1987-06-29 | 1990-08-14 | Shell Oil Company | Method for crystallizing magnesium chloride and method for using in a catalyst composition | 
| US5780379A              (en)* | 1987-09-25 | 1998-07-14 | Solvay Polyolefins Europe-Belgium (Societe Anonyme) | Process for the stereospecific polymerization of alpha-olefins and catalyst system which can be employed for this polymerization | 
| FR2628430B1              (fr)* | 1988-03-09 | 1992-04-17 | Solvay | Procede pour la polymerisation stereospecifique des alpha-olefines et systeme catalytique utilisable pour cette polymerisation | 
| US4818799A              (en)* | 1987-11-13 | 1989-04-04 | Shell Oil Company | Process for the in-reactor stabilization of polyolefins | 
| US5206315A              (en)* | 1989-04-10 | 1993-04-27 | Phillips Petroleum Company | Process for polymerizing 1-olefins and catalyst therefor | 
| US5270276A              (en)* | 1989-04-25 | 1993-12-14 | Shell Oil Company | Process for the production of elastomeric, primarily syndiotactic polypropylene and catalysts for use in said process | 
| US5270410A              (en)* | 1989-04-25 | 1993-12-14 | Shell Oil Company | Process for the production of elastomeric, primarily syndiotactic polypropylene and catalysts for use in said process | 
| US4971936A              (en)* | 1989-07-10 | 1990-11-20 | Shell Oil Company | Catalyst component for making primarily isotactic elastomeric polypropylene or polybutene | 
| US5089573A              (en)* | 1990-02-26 | 1992-02-18 | Shell Oil Company | Process for the production of elastomeric, primarily isotactic polyolefins and catalysts for use in said process | 
| US5118649A              (en)* | 1990-02-26 | 1992-06-02 | Shell Oil Company | Process for the production of elastomeric primarily isotactic polyolefins and catalysts for use in said process | 
| US5118767A              (en)* | 1990-02-26 | 1992-06-02 | Shell Oil Company | Process for producing mildly elastomeric primarily isotatic polypropylene and poly-1-butene | 
| US5164352A              (en)* | 1990-05-11 | 1992-11-17 | Shell Oil Company | Process for the production of elastomeric, primarily isotactic polyolefins and catalysts for use in said process | 
| US5118768A              (en)* | 1990-05-11 | 1992-06-02 | Shell Oil Company | Process for the production of elastomeric, primarily isotactic polyolefins and catalysts for use in said process | 
| CA2072476C              (en)* | 1991-06-27 | 2002-09-03 | Yoshio Tajima | Catalysts components for polymerization of olefins | 
| US5414063A              (en)* | 1993-03-30 | 1995-05-09 | Huntsman Polypropylene Corporation | Process for the production of polypropylene | 
| US7078362B2              (en)* | 2004-12-09 | 2006-07-18 | Equistar Chemicals, Lp | Carbene donor-modified Ziegler-Natta catalysts | 
| US20110082268A1              (en) | 2009-10-02 | 2011-04-07 | Sandor Nagy | Indazole-modified ziegler-natta catalyst system | 
| US20110082270A1              (en)* | 2009-10-02 | 2011-04-07 | Sandor Nagy | Pyridazine-modified ziegler-natta catalyst system | 
| US8017708B2              (en) | 2009-10-02 | 2011-09-13 | Equistar Chemicals, Lp | Nitroso-modified Ziegler-Natta catalyst system | 
| US7871952B1              (en) | 2009-10-02 | 2011-01-18 | Equistar Chemicals, Lp | 2-hydroxypyridine N-oxide-modified ziegler-natta catalyst system | 
| EP4143242A1              (en) | 2020-04-30 | 2023-03-08 | Dow Global Technologies LLC | Ziegler-natta (pro)catalyst systems made with azaheterocyclic compound |