One‐phase supported titanium‐based catalysts for polymerization of ethylene and its copolymerization with 1‐alkenes. I. Preparation and properties of catalysts

Abstract

Active one‐phase Ti‐based supported catalysts were prepared by interacting the activated silica gel (0.8 mmol OH groups/g) with RxAlCl3–x (x = 1–3, Al/OH = 0.9–1.0), then with TiCl4 and R2Mg (Mg/Ti = 1–16), and finally with R3Al (Al/Ti = 0–16). The catalyst activity in the fluid bed ethylene polymerization varied between 40 and 540 kg PE/g Ti h, depending on the component used and preparation conditions employed. A mechanism of the polymerization‐active species formation was proposed.

Studies on probing SiO2 surface using BF3 as probe and SiO2/Al2Et3Cl3/TiCl4(PhMgCl) catalytic system for copolymerization of ethylene and propylene

“…The interaction between SiO 2 and Al 2 Et 3 Cl 3 can be described simply as shown in Scheme , 10, 12 which was supported by trapped ethane.…”

“…The active species of higher activity in the SiO 2 /Al 2 Et 3 Cl 3 /TiCl 4 (PhMgCl) catalytic system (catalyst C) may be as shown in Scheme . 12 The 13 C‐NMR spectrum indicates that the resultant polymer is a typical copolymer of ethylene and propylene (see Fig. 5).…”

“…In recent years, many researchers have discovered and developed new metallocene catalysts for olefin polymerization 1–7. Due to some serious problems with metallocene catalysts, for example, some resultant polymers prepared by a metallocene catalyst are difficult to process, many researchers still pay much attention to classic titanium‐based catalysts suitable for the preparation of polyolefins, particularly for polypropylene, polyethylene, and the copolymer of ethylene and propylene 8–13. Since most of the conventional Ziegler–Natta polyolefin industrial plants are designed to use heterogeneous catalysts, fixation of homogeneous catalysts on a solid support is an important but challenging task and has attracted many researchers 8–16.…”

Novel magnetic polyethylene nanocomposites produced by supported nanometre magnetic Ziegler-Natta catalyst

“…The reaction between AlR 3 and hydroxyls on the surface of the nanometre magnetic particles to form anchoring points AlEt 2 (step 2) is shown in Scheme , which has been investigated extensively 6. 7 Usually the organoaluminium compounds are added at a ratio of Al/OH > 1 in order to remove OH completely and to form anchoring points.…”

“…Many papers have been published about olefin polymerization catalysed by supported Ziegler–Natta catalyst since the discoveries by Ziegler's group in 1953 and by Natta's group in 1954. A large number of supported Ziegler–Natta catalysts, particularly suitable for the preparation of polyethylene, polypropylene and copolymer of ethylene and propylene, have been discovered and developed 1–13…”